JP2000016197A - Load driving device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the total amount of power cables connecting a battery with a plurality of loads studded in a vehicle. SOLUTION: A plurality of loads 40-44 are studded in a vehicle body, and drive circuits 10, 12, 14 to drive the loads by supplying the power from a battery 1 are installed in places where loads are concentrated. The power supply system is configured so that the drive circuits are connected electrically with respective power cables in loop form, wherein one branch 101A diverged from the main power line 2 is connected with the input end 10b of the drive circuit 10, and the input end 10a of the drive circuit 10 and the input end 12b of the drive circuit 12 are connected through a mutual connection power cable 101C, while the input end 12a of the drive circuit 12 and the input end 14b of the drive circuit 14 are connected through a mutual connection power cable 101D, and the input end 14a of the drive-circuit 14 is connected with the other branch 101B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load driving device for supplying electric power to a plurality of loads and driving each of the plurality of loads. The present invention relates to a load drive device.

[0002]

2. Description of the Related Art As a conventional vehicle load drive device, for example, a power supply line from a vehicle-mounted power supply (battery) is connected to each of a plurality of loads provided in a vehicle body in an octopus-like wiring. Some drive each load. However, in such a vehicle load drive device, the total power supply dose increases.

In recent years, therefore, a drive circuit has been provided for each location where a plurality of loads are concentrated, and a power supply line from a battery is connected to one.
Devices that are connected to each drive circuit in an octopus manner are proposed.

[0004] In addition to the above-mentioned technology, there is a vehicle load drive device described in Japanese Patent Application Laid-Open No. 63-170146.

[0005]

However, in each of the prior arts, since a plurality of power supply lines are connected to the battery in an octopus-like manner, the total power supply dose increases, the manufacturing cost increases, and the disconnection occurs. And the risk of short circuit is high. Further, when the power supply line between the battery and the load is disconnected or short-circuited, the load is not driven at all, and there is a problem that fail-safe considerations for failure of the power supply line are not sufficiently taken.

The present invention has been made in view of such conventional problems, and the total power supply dose is reduced.
The manufacturing cost can be reduced, the risk of disconnection or short circuit can be reduced, and even if the power supply line is disconnected or short-circuited, the load connected to the power supply line is continuously driven. It is an object of the present invention to provide a load drive device for a vehicle that can perform the above operation.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle load driving apparatus for driving each load by supplying electric power from a power supply to each load provided at various parts of a vehicle body. A plurality of drive circuits for driving one or more predetermined loads, and a power supply line for electrically connecting the power supply and the plurality of drive circuits, wherein the plurality of drive circuits are: Each has two power inputs,
The power supply line, a main power supply line connected to the power supply,
A branch power supply line that is bifurcated from the main power supply line and is connected to power input terminals of two of the plurality of drive circuits; and a power input terminal of the drive circuit and a drive that is different from the drive circuit. An interconnecting power supply line interconnecting a power input end of the circuit, wherein the branch power supply line, the plurality of drive circuits, and the interconnecting power supply line are electrically connected in a loop shape This is achieved by a vehicle load drive device.

[0008] In a vehicle load driving device for supplying electric power from a vehicle-mounted power supply to a load provided in a vehicle and driving the load, a drive for supplying electric power from the power supply to the load by inputting a driving signal. An element, a power supply line for electrically connecting the power supply and the drive element, and power cutoff means provided in the power supply line, for cutting off power from the power supply to the drive element by input of a cutoff signal, It is determined whether or not to drive the load.If it is determined that the load is to be driven, the drive signal is output to the drive element.If it is determined that the load is not to be driven, the cutoff signal is sent to the power cutoff unit. And output control means. In addition, in a vehicle load driving device that supplies power from a vehicle-mounted power supply to a load provided on a vehicle body and drives the load, the vehicle load driving device has two power input terminals, and the power input from the power input terminal is used as the power input device. A drive circuit that supplies the load to drive the load; and a power supply line that electrically connects the power supply and the two power input terminals of the drive circuit. This is achieved by a vehicle load drive device.

Further, in a vehicle load driving apparatus for driving a load provided in a vehicle by supplying power from a vehicle-mounted power supply, the load driving device has one or more power input terminals, A drive circuit that supplies power input from the power supply to the load to drive the load, a control circuit that controls the drive circuit, and a power supply line that supplies power to the drive circuit from the power input terminal. A power line to the control circuit;
This is achieved by a load drive device for a vehicle, comprising:

Further, in a vehicle load driving apparatus for driving a load provided in a vehicle by supplying power from a vehicle-mounted power supply to the load, the load driving device has one or more power input terminals. A drive circuit that supplies power input from the power supply to the load to drive the load, a control circuit that controls the drive circuit, and a power supply line that supplies power to the drive circuit from the power input terminal. A power line to the control circuit;
The present invention is attained by a load driving device for a vehicle, comprising a diode between the power input terminal and a power line to the control circuit.

Still further, in a vehicle load driving apparatus for driving a load provided in a vehicle by supplying power from a vehicle-mounted power supply to the load, the vehicle load driving device has one or more power input terminals, A drive circuit that supplies the power input from the power supply to the load to drive the load, and a power supply line that supplies power to the drive circuit from the power input end. This is achieved by a vehicle load drive device characterized by the following.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a load driving device for a vehicle according to the present invention.

As shown in FIG. 1, the vehicle load drive device of the present embodiment includes a battery 1 and a BCM (Body Control Module).
e) LCU (LocalCo) connected by 3 and multiplex communication line 4
ntrol Units) 5, 6 and driving circuits 10, 12, 14 for driving and controlling loads such as lamps provided in various parts of the vehicle body, and power supply multiplexing connecting these driving circuits. There is a terminal group that includes the communication line 20. These two groups are controlled and managed by the BCM 3. BCM is an abbreviation of a body control module, which means a device for controlling electrical components (load) of a vehicle. LCU is an abbreviation of a local control unit, which is distributed and arranged in a vehicle and operates such as a lamp switch and a power window switch. Captures switch information operated by the user, displays the operating status of the drive circuit,
It is an information terminal that issues an alarm.

An abnormality warning lamp 7 connected to the LCU 6 is turned on when an abnormality occurs in the terminal side group or the like, and is used to warn the driver that there is an abnormality in the electric system.
Although only one lamp 7 is used here,
For example, a warning lamp may be provided for each cause such as a short circuit of the power supply multiplex communication line 20 and a load abnormality. Also,
The warning to the driver may be, for example, a warning by displaying characters on a liquid crystal display panel or a warning by sound, in addition to the warning by turning on the lamp.

The battery 1 is connected to the main power line 2 by a BCM.
3 and electrically connected to the LCUs 5 and 6 by the device power supply line 2a. The drive circuits 10, 12, and 14 are connected in a loop by a power supply multiplex communication line 20, respectively. The reason for connecting in a loop is that, for example, even if the power supply multiplex communication line 20 is disconnected between the drive circuits 10 and 12, the overall function is not affected.

The drive circuits 10, 12, and 14 are arranged in the vicinity of several places where the electrical components of the vehicle are concentrated.
This is a circuit that supplies power from the battery 1 to loads such as lamps, motors, and control devices and drives them. In FIG. 1, reference numerals 40 to 46 denote driving circuits 10 and
Loads such as lamps connected to 12 and 14. Here, an outline of a series of operations will be described.

For example, when the switch 8 for lighting the load (headlight; headlight) 45 of the vehicle is turned on, the LCU 5 to which the switch 8 is connected to the BCM 3 calls the "headlight lighting switch ON". Data is sent. The BCM 3 determines what data is to be transmitted to which drive circuit based on the obtained data,
The data “turn on the headlights” is transmitted to the drive circuit 12 to which the headlights 45 are connected. Then, the drive circuit 12 that has received this data opens the power supply circuit for the headlights 45 and supplies a current to turn on the headlights 45.

Next, each component of the vehicle load drive device of the present embodiment will be specifically described.

As shown in FIG. 2, the power supply multiplex communication line 20 connecting the drive circuits and the like includes a power supply line 101 through which a current from the battery 1 flows, and a communication line 10 through which various signals are transmitted.
2, a metallic shield layer 103 covering the power supply line 101 and the communication line 102, and a sheath (outer skin) 103x further covering the shield layer 103. That is, the power supply multiplex communication line 20 of the present embodiment is a two-core shielded line. However, the difference from a normal shield wire is that a potential is applied to the shield layer 103. By applying a potential to the shield layer 103 in this way, when the power supply multiplex communication line is rubbed or pinched by the vehicle body, the potential of the shield layer 103 first drops to ground (vehicle body ground). By doing so, it is possible to know the signs of the occurrence of a disconnection or short circuit accident. This shield layer 1
03 is connected to the ground via the capacitor 103y. Since capacitors have the property of passing high frequencies,
When the shield layer 103 is connected to the ground via the capacitor 103y, even if an external high frequency is applied to the shield layer 103, it can be released to the ground, thereby preventing external noise and radiation noise. Can be. Further, since the shield layer 103 is made of metal,
There is also an effect that the strength of the power supply multiplex communication line itself is increased and time is gained until a disconnection accident occurs.

As shown in FIG. 3, the BCM 3 is a microcomputer (upper control means) for executing various arithmetic processing.
A communication IC (A) 32 for receiving / transmitting data between the LCUs 5 and 6; a communication IC (B) 33 for receiving / transmitting data between the driving circuits 10, 12, 14; A switching circuit 34 for switching a power supply destination;
Input circuit 35 for taking in the potential of shield layer 103 of 0
And an internal power supply circuit 30 that supplies power for operating these components.

The main power supply line 2 from the battery 1 is led to the internal power supply circuit 30 and is connected to the B
The power line 36 is connected to the internal circuit of the CM 3, and the power line 38 is connected to the power multiplex communication line 20. The power supply line 38 is bifurcated on the way, enters the switching circuit 34, and is connected to the power supply multiplex communication line 20 via switches A and B, respectively.
Power supply lines 101a and 101b. Switching circuit 334
Are connected to the microcomputer 331 via a control signal line 341. The switches A and B of the switching circuit 334 are ON / OFF controlled by a switch control signal transmitted from the microcomputer 31 via the control signal line 341.

The communication IC 332 is connected to the multiplex communication line 4
The communication IC 333 is connected to the LCUs 5 and 6 and the driving circuit 1 is connected to the power supply multiplex communication line 20 via the multiplex communication line 344.
0,12,14. These communication IC3
32 and 333 are control signal lines 33, respectively.
7, 342 and data buses 339, 340 are connected to the microcomputer 331. The multiplex communication line 344 connected to the communication IC 333 is bifurcated on the way,
The multiplex communication lines 102a, 102a,
102b.

The input circuit 335 is connected to the microcomputer 331 via a bus 343. This input circuit 3
35 is a circuit for taking in the potentials of the shield layers 103a and 103b of the power multiplex communication line 20, as described above.
This potential is monitored by the microcomputer 331 via the bus 343.

In the above description, the power supply lines 101a and 101b of the power supply multiplex communication line 20 and the multiplex communication line 102
The suffixes (a, b) attached to the a and 102b and the shield layers 103a and 103b indicate which one of the left and right power supply multiplex communication lines 20 is used. (A) is attached to those included in the power multiplex communication line 20 extending in the clockwise direction, and (b) is assigned to those included in the power multiplex communication line 20 extending in the counterclockwise direction. It is attached. Regarding these suffixes (a, b), each of the driving circuits 10, 12,
Similarly, the power supply multiplex communication line 2 extending clockwise around the drive circuits 10, 12 and 14.
Those included in 0 are denoted by (a), and those included in the power multiplex communication line 20 extending in the counterclockwise direction are denoted by (b).

As shown in FIG. 4, the drive circuit 12 is a communication LSI (communication LSI) for controlling communication between two input terminals 12a and 12b respectively connected to two power supply multiplex communication lines 20 and various internal circuits and the BCM 3. Terminal-side control means) 107;
Two power lines 101a and 101b of the power multiplex communication line 20
And a switching circuit 106 that switches between accepting power from any one of the above and a state in which no power is received from any of them, and an IPD that directly drives the loads 44, 45, and 46 connected to the drive circuit 12, respectively. (In
telligence Power Device) 110, 111, 112
And an internal power supply circuit 105 for supplying electric power for operating these components.

The switching circuit 106 has switches A, B, and C.
01a and the IPDs 110, 111 and 112, and the power supply multiplex communication line 101b and the IPDs 110, 111 and 112.
Connection and disconnection, power supply lines 101a, 101b and IPD11
It is responsible for connecting and disconnecting with 0, 111, and 112. The power line 101a of the power multiplex communication line 20 is connected to the input terminal of the switch A via the input terminal 12a.
The power line 101b of the power multiplex communication line 20 is connected to the input terminal of the switch B via the input terminal 12b. The output terminals of the switches A and B are the input terminals of the switch C. The output terminal of the switch C is connected to the IPD1
10, 111, and 112 are connected. This switching circuit 1
Reference numeral 06 is connected to the communication LSI 107 via a control signal line 109. The switches A, B, and C of the switching circuit 106
A switch control signal transmitted from the communication LSI 107 via the control signal line 109 causes an ON-O
FF control is performed.

Here, the operation of the switching circuit 106 will be described.
Normally, the switches A, B, and C of the switching circuit 106 are all ON. However, when the power supply multiplex communication line 20 is short-circuited or disconnected, or is likely to be short-circuited or disconnected, the switch A or the switch B is turned off. Specifically, for example, when the left power multiplex communication line 20, that is, the power line 101a is short-circuited or disconnected, only the switch A is turned off. In this case, power is supplied only from the right power supply line 101b. The detection of the short circuit or the disconnection of the power supply line 101 and the operation processing procedure of the switches A and B after the detection will be described later.

The switch C of the switching circuit 106 has the following 2
To achieve two objectives.

First, the first object is to reduce the current consumption of the IPD when not in use. Where IP
When D is not used, it means that the driving element (described later) built in the IPD is not turned on. Although the IPD generally has excellent performance as described later, the power consumption when not in operation is larger than that of a mere driving element, and thus there is a risk of running out of the battery when used in large quantities. Therefore, to prevent this, IPD
When is not used, switch C is turned off,
The power to the IPD is cut off to reduce power consumption. The processing procedure from the detection of whether the IPD is in use to the operation of the switch C will be described later.

A second object is to cope with a failure of the IPD when the failure occurs. In some cases, the IPD breaks down and supplies power to the load even though no drive signal is output from the communication LSI 107, for example. Therefore, when the IPD fails, the switch C is turned off to cut off the power applied to the IPD, thereby stopping the power supply to the load. The switching circuit 1
Since the switch used in the switch 06 receives the total current supplied to the load, when a semiconductor element is used, it is desirable that the resistance (ON resistance) when the switch is turned on be as small as possible. It is better to use (relay). Note that the failure detection of the IPD and the operation processing procedure of the switch C will also be described later.

Power supply lines 101a, 101 in drive circuit 12
b is divided into two parts on the way to the switching circuit 106, one of which extends to the switching circuit 106 and the other extends to the internal power supply circuit 105. Power supply lines 101a and 101b extending to the internal power supply circuit 105 respectively have
Diodes 104, 104 are provided. The diodes 104, 104 function to prevent the backflow of the current flowing through the power supply lines 101a, 101b and to take the logical sum of the current flowing through the power supply lines 101a, 101b. That is, if one of the power supply lines is alive, the diodes 104, 104 are alive. And a function of flowing a current from a power supply line to the internal power supply circuit 105. In this way, by connecting the power supply line to the control circuit internal power supply circuit 105 in a system different from the power supply line 108, the switching circuit 106
It is possible to supply a stable power supply to the internal power supply circuit 105 in any operation state of.

The internal power supply circuit 105 is connected to an internal circuit in the drive circuit 12 such as the communication LSI 107 via a power supply line. The internal power supply circuit 105 is connected to the communication LSI 107 as described above.
And a constant voltage circuit for supplying power to other internal circuits.

The communication lines 102a, 1 of the power multiplex communication line 20
02b and the shield layers 103a and 103b
Connected to 07. The potential of the shield layers 103a and 103b of the power multiplex communication line 20 is monitored by the communication LSI 107.

IPD is an abbreviation of intelligent power device and is a kind of load driving element. It diagnoses short-circuit and disconnection of the connected load, outputs this information to the communication LSI 107, and protects itself. These elements are being used in recent years. As shown in FIG. 5, the IPD 110 includes a drive element 110a for controlling power supply cutoff to the load 45, and a load diagnosis circuit 110 for diagnosing short-circuit and disconnection of the load 45 connected to the drive element 110a.
b. The gate of the driving element 110a
The drain of the driving element 110a is connected to the power supply line 108 extending from the switching circuit 106, and the source of the driving element 110a is connected to the driving signal line 114 extending from the LSI 107. Is connected to The load diagnosis circuit 110b is connected to the communication LSI 107 via a load diagnosis signal line 113. The load diagnosis circuit 110b can capture the drain potential and the gate potential of the drive element 110a, monitors the drain potential and the gate potential, and diagnoses short-circuit and disconnection of the load 45 from both potential states. , Using this result as a load diagnostic signal
Output to the communication LSI 107 via the load diagnosis signal line 113.
The power supply line 108a is connected to the communication LSI 107 and the device diagnostic signal line 115.
Connected by In the communication LSI 107, an impedance converter A connected to the element diagnostic signal line 115 and a resistor R1 connected to the converter A and the ground are provided. Impedance converter A, resistor R1
Has a function of preventing an electrical influence on the IPD 110 and a function of stabilizing an element diagnostic signal when the power supply line 108b is disconnected.

Although the configuration of one IPD 110 among a plurality of IPDs has been described above, the other IPDs 111 and 112 have the same configuration.
Has the same configuration as the IPD 110. That is, any IP
Each of D111 and 112 also has a drive element and a load diagnosis circuit, and includes a communication LSI 107, drive signal lines 117 and 120 (shown in FIG. 4), and diagnostic signal lines 116 and 119 (shown in FIG. 4). It is connected. Further, a power supply line 108a connecting each of the IPDs 111 and 112 and the loads 46 and 44 is connected to the communication LSI 107 and an element diagnosis signal line 118 and 121, respectively. In the above description, among the plurality of drive circuits,
The configuration of one drive circuit 12 has been described, but the other drive circuits 10 and 14 have the same configuration as the drive circuit 12.

FIG. 6 shows the detection of short-circuit and open-circuit (disconnection) of the load connected to the drive circuit and the failure detection of the IPD element.
This will be described with reference to FIG. It should be noted that, in the same figure, the portion marked “-” (slant) indicates that either “H” or “L” may be used.

If there is no abnormality at all, the communication LSI 107
When the drive signal is "H" (drive element ON instruction), IP
The load diagnostic signal of “H” is also transmitted from the diagnostic circuit of D to the communication LSI 107.
Is output to Further, when the drive signal from the communication LSI 107 is “L (drive element OFF instruction)”, the load diagnostic signal of “L” is also output to the communication LSI from the IPD diagnostic circuit. The communication LSI 107 determines that there is no abnormality on the load side when both the drive signal and the load diagnosis signal are “H” or “L” as described above when the IPD is not out of order.

When the load is open (disconnected), when the drive signal from the communication LSI 107 is “L”, the IPD diagnosis circuit outputs a “H” load diagnosis signal to the communication LSI 107. You. If the load is short-circuited,
When the drive signal from the LSI 107 is “H”, the load diagnostic signal of “L” is output from the diagnostic circuit of the IPD to the communication LSI. When the IPD is not out of order, the communication LSI 107
As described above, when the drive signal is “L” and the load diagnostic signal is “H”, it is determined that the load is released, and when the drive signal is “H” and the load diagnostic signal is “L”, it is determined that the load is short-circuited. .

If the IPD itself breaks down, the load diagnosis signal cannot be relied on.
07 monitors the drive signal, the load diagnostic signal, and the element diagnostic signal to determine the situation. Specifically, when all of the drive signal, the load diagnosis signal, and the element diagnosis signal are “H” or “L”, it is determined that both the IPD and the load are normal. When the drive signal is “L”, the load diagnostic signal is “H” or “L”, and the element diagnostic signal is “H”, or when the drive signal is “H” and the load diagnostic signal is “H”, If the element diagnosis signal is "L", it is determined that the element is abnormal. Further, the drive signal is “L” and the load diagnosis signal is “H”.
When the element diagnostic signal is "L", it is determined that the load is released, the drive signal is "H", and the load diagnostic signal is "L".
When the element diagnosis signal is "L", it is determined that the load is short-circuited.

Here, each of the loads 40, 4
The main routes of the power supply lines to 1,... Will be described again with reference to FIG.

Drive circuits 10, 12, and 14 for driving these loads (load groups) are provided at locations where a plurality of loads are concentrated in the vehicle body. Each of the drive circuits 10, 12, and 14 has two input terminals 10 respectively.
a, 10b, 12a,... are provided. Battery 1
Is connected to one main power supply line 2, the end of which is divided into two branches in the BCM 3, each of which is connected to the switching circuit 34 in the BCM 3.
Are connected to the input terminals 10b and 14a of the drive circuits 10 and 14 via the switches A and B, respectively. Here, the power supply lines extending from the portion where the main power supply line 2 is forked to the input terminals 10b and 14a of the drive circuits 10 and 14 are referred to as branch power supply lines 101A and 101B. The input terminal 10a of the drive circuit 10 and the input terminal 12b of the drive circuit 12 are connected by an interconnection power supply line 101C.
2a and the input terminal 14b of the drive circuit 14 are connected by an interconnection power supply line 101D. That is, the power supply system according to the present embodiment is configured such that the branch power supply line 101
A, the drive circuit 10, the interconnection power supply line 101C, the drive circuit 12, the interconnection power supply line 101D, the drive circuit 14, the branch power supply line 101B, and again a loop point such as a branch point of the main power supply line 2. I have.

As described above, in this embodiment, since each power supply line and the like are connected in a loop, the total power supply dose can be made much smaller than when each load from the battery 1 is connected in an octopus wiring. Can be. As a result, the manufacturing cost can be reduced, and the risk of disconnection or short circuit can be reduced.

In this embodiment, the power supply lines are connected in a loop and two input terminals are secured in one drive circuit, so that the power supply from one input terminal is disconnected or Even if it is cut off by a short circuit, power can be supplied from another input terminal. For example, the branch power line 101
When A is short-circuited or disconnected, the drive circuit 10 includes the other branch power supply line 101B and the interconnecting power supply lines 101D and 1D.
Power is supplied via 01C. That is, in the present embodiment, the branch power supply lines 101A and 101B, the interconnection power supply line 1
Even if any one of 01C and 101D is disconnected or short-circuited, power supply to all loads continues to be ensured.

Next, from the BCM 3, the driving circuits 10, 1
The communication lines 2 and 14 will be described again with reference to FIG.

In the BCM 3, the communication line is divided into two branches, and the branch communication line 102 is connected to the signal input terminals 10b and 14a of the two drive circuits 10 and 14, respectively.
A, 102B, an interconnecting communication line 102C interconnecting the input terminal 10a of the drive circuit 10 and the input terminal 12b of the drive circuit 12, the input terminal 12a of the drive circuit 12 and the drive circuit 1
Communication line 10 interconnecting the input terminals 14b
4C. That is, the signal system of this embodiment includes the BCM 3, the branch communication line 102A, the drive circuit 10, the interconnect communication line 102C, the drive circuit 12, the interconnect communication line 102D, the drive circuit 14, the branch communication line 102B, and again.
They are connected in a loop like BCM3.

Therefore, the signal system of the present embodiment can reduce the total communication dose, reduce the manufacturing cost, and reduce the risk of disconnection or short circuit of the communication line, similarly to the power supply system of the present embodiment. . Further, the branch communication lines 102A and 102A
2B, even if any one of the interconnect communication lines 102C and 102D is disconnected or short-circuited, it is possible to secure the reception and transmission of signals between the drive circuits 10, 12, and 14 and the BCM 3 as the control means. . Next, the operation of the vehicle load drive device according to the present embodiment will be described with reference to a flowchart. Note that the processes described below are all processes performed by the BCM 3, and portions that are not directly related to the present invention are omitted.

FIG. 9 shows a processing flow in which the BCM 3 performs data communication with the LCUs 5 and 6 via the multiplex communication line 4. LCU communication interrupt processing 200 is performed by LCU5,
This is an interrupt process when the data from No. 6 is received by the BCM 3. First, upon receiving a data reception interrupt from the LCUs 5 and 6, in step 201, the data transmitted from the LCUs 5 and 6 is received, and a loading process is performed. This data is, for example, data such as “headlight lighting switch ON” as described above. Next, in step 202, the next LCU to be accessed is selected. In step 203, for example, a process of transmitting data for turning on an indicator for notifying that the headlights have been turned on to the selected LCU is performed. The LCU that has received the data transmitted by the BCM 3 outputs the received data to the outside, and further operates to return the input signal captured at this time to the BCM 3. For example, when the BCM 3 receives the data of “power supply system abnormality” from the drive circuit 10, the
The LCU 6 that is transmitted from the M3 to the LCU 6 and receives this data turns on the abnormality warning lamp 7 to notify the driver of the power system abnormality. Hereinafter, this process is repeated cyclically, and multiplex communication is repeated.

FIG. 10 shows a processing flow in which the BCM 3 performs data communication with each of the drive circuits 10, 12, and 14 via the multiplex communication line 102. Drive circuit communication interrupt processing 3
00 is a communication LS built in the drive circuits 10, 12, 14.
This is an interrupt process when data from I107 is received.
In step 301, the communication LS of the drive circuits 10, 12, 14
Captures the data received from I107. In step 302, diagnostic information of the IPDs 110, 111,..., Diagnostic information of the loads 40, 41,.
The state and the like of the switching circuit 106 in 2, 14 are arranged. In step 303, the drive circuit to be accessed next is selected. In step 304, the communication LSI 107 of the drive circuit
A drive signal of the PD and a switching signal of the switching circuit are transmitted. Hereinafter, this process is repeated cyclically.

FIG. 11 shows a BGJ (Back) executed when the above-described interrupt processing of FIGS. 7 and 8 is not executed.
In the Ground Job) process 400, here, a process of controlling the entire system, which data is transmitted to which partner, based on the data obtained through communication is performed.

First, in step 401, each drive circuit 1
Based on the received data obtained from 0, 12, and 14 and the LCUs 5 and 6, a process of determining what to do is performed. For example, from LCU5, "headlight lighting switch ON"
When this data is received, "I want to turn on the headlights." Step 402
Then, the transmission data from the BCM 3 to the LCUs 5 and 6 are set in reverse. In step 403, the diagnostic information of the IPDs 110, 111,..., The diagnostic information of the loads 40, 41,.
0, the potential of the shield layer 103, the drive circuits 10, 12, 1
The state of the switching circuit 106 in 4 is checked. In step 404, it is determined whether or not the check result of the diagnostic information or the like indicates an abnormality. If the result is abnormal, the abnormality processing of step 500 is executed. Details of the abnormal time process (step 500) will be described later with reference to the flowchart of FIG. When the abnormality process (step 500) is completed, in step 405, data for notifying the driver that an abnormality has occurred is prepared. This is data such as the above-mentioned "power supply system abnormality". When this data is transmitted to the LCU 6, the abnormality warning lamp 7
Lights up. Then, in step 406, processing for transmitting data to the drive circuits 10, 12, and 14 is performed. If it is determined in step 404 that there is no abnormality, the processes of steps 500 and 405 are not performed, and the process of step 406 is immediately performed. Subsequently, in step 407, when it is determined that there is no signal to be output, that is, there is no need to drive the loads connected to the drive circuits 10, 12, and 14, and there is no abnormality in the power supply system. When it is determined, the switch C of the switching circuit 106 of the drive circuits 10, 12, and 14 is determined in step 408.
Set the signal to turn OFF. When this data is transmitted to the communication LSI 107 of the drive circuits 10, 12, and 14, the communication LSI 107 turns off the switch C of the switching circuit 106. As a result, the power supplied to each IPD of the drive circuit is cut off. That is, the driving element of the IPD is
When not set to N, in other words, when the load connected to the IPD is not driven, the power to the IPD is cut off.
As described above, when the IPD is not used, power to the IPD is cut off, so that power consumption can be reduced.

The determination of "Is there an output request?" In step 407 is made for each of the driving circuits 10, 12, and 14, and even if one of the plurality of driving circuits 10, 12, and 14 is " If there is no output request, the process of step 408 is performed for the drive circuit.

FIG. 12 is a detailed flowchart of step 500 in the flowchart of FIG. In step 501, it is checked whether the power multiplex communication line 20 is disconnected or short-circuited based on the potential of the shield layer 103 of the power multiplex communication line 20. Power supply line 1 of power supply multiplex communication line 20
01 is short-circuited or short-circuited.
A potential abnormality occurs in the shield layer 103 covering the outer periphery of the reference numeral 01. The potential of the shield layer 103 is controlled by the microcomputer 31 of the BCM 3 and the driving circuits 10, 12, 1.
4 is monitored by the communication LSI 107 of the power supply multiplex communication line 2
The potential abnormality of the shield layer 103 of 0 indicates that the BCM3
Of microcomputer 31 will recognize. Therefore, the microcomputer 31 of the BCM 3 determines whether or not the power supply multiplex communication line 20 is disconnected or short-circuited based on whether or not there is a potential abnormality of the shield layer 103 of the power multiplex communication line 20.

If there is an abnormality in the power multiplex communication line 20, the process proceeds to step 502. If there is no abnormality in the power multiplex communication line 20, the process skips step 502 and proceeds to step 503.

When it is determined that there is an abnormality in the power supply multiplex communication line 20 and the routine proceeds to step 502, the switching circuit 34 of the BCM 3 and the switching circuit 10 of each of the driving circuits 10, 12, and 14 are used.
A signal for turning off the switch A or B of No. 6 is set. This signal is used as the communication LSI 1 of each of the drive circuits 10, 12, and 14.
07, the switching circuit 106 of each drive circuit operates,
When the switching circuit 34 of the BCM 3 operates, the power supply from the broken or short-circuited power supply multiplex communication line 20 of the power supply multiplex communication line 20 is cut off, and power is supplied only from the power supply multiplex communication line 20 having no abnormality. Become so. That is, the disconnected or short-circuited power supply multiplex communication line 20 is disconnected from the power supply system. Recognition of whether any of the power supply multiplex communication lines 20 is disconnected or short-circuited, and the respective drive circuits 1
Determination of how to specifically operate the switching circuits 106 and 34 between 0, 12, and 14 and the BCM 3 will be described later.

As described above with reference to FIGS. 7 and 8, even if any of the power supply multiplex communication lines 20 is disconnected or short-circuited, the load driving device of this embodiment will
The power supply and the signal transmission / reception can be performed with respect to 2,14. However, when the power supply line 101 is short-circuited, the consumption of the battery 1 is extremely large, and the battery 1 may be discharged very quickly, or a fire may occur at the short-circuited portion. Therefore, in this embodiment,
When a certain power supply multiplex communication line 20 is short-circuited or disconnected, the power supply multiplex communication line 20 is disconnected from the power supply system so that no current flows from the short-circuited portion to the vehicle body. Similarly, a switching circuit may be provided for a communication line so that a specific communication line can be disconnected. However, in the case of a communication line, the energy level applied to the communication line is higher than the energy level applied to the power supply line. In this embodiment, the switching circuit for the communication line is not provided since the battery 1 is much smaller and the possibility that the battery 1 goes up or a fire occurs at a short-circuited portion is very small.

Subsequently, in step 503, it is checked whether there is a drive element abnormality. As described above, the drive LSI abnormality is determined by the communication LSI 107 of each of the drive circuits 10, 12, and 14 based on the three signals of the drive signal, the load diagnosis signal, and the element diagnosis signal. BCM3 microcomputer 31
Determines whether there is an element abnormality based on the element diagnostic information sent from the communication LSI 107 of each of the drive circuits 10, 12, and 14. In step 504, the driving circuits 10, 12, 14
Among them, a signal for turning off the switch C of the switching circuit 106 of the drive circuit having the element abnormality is set. When this data is transmitted to the communication LSI 107 of the drive circuit having the element abnormality, the communication LSI 107 turns off the switch C of the switching circuit 106. As a result, the power supplied to each drive element of the drive circuit is cut off.

In step 505, it is checked whether there is a load abnormality. Regarding load abnormality, as described above,
The communication LSI 107 of each of the drive circuits 10, 12, and 14 makes a determination based on three signals: a drive signal, a load diagnosis signal, and an element diagnosis signal. The microcomputer 31 of the BCM 3
It is determined whether there is a load abnormality based on the load diagnosis information sent from the communication LSI 107 of each of the drive circuits 10, 12, and 14. In step 506, a signal for stopping the output of the drive signal to the IPD connected to the abnormal load is set. This data is transmitted to the drive circuit with the load abnormality.
When transmitted to the LSI 107, the communication LSI 107 stops outputting the drive signal to the IPD connected to the abnormal load.

When any one of the processes in steps 502, 504, and 506 is executed, the "abnormality alert information transmission process" in step 405 in FIG. 11 is executed. FIG. 13 is a detailed flowchart of step 501 in FIG.

First, in step 601, the potential data of the shield layer 103 of the power multiplex communication line 20 obtained by the BCM 3 itself is checked. That is, the shield layers 103a and 103a of the two power-source multiplex communication lines 20 directly connected to the BCM 3
Check the potential of 103b. In step 602,
It is determined whether the potential of one of the two shield layers 103a and 103b is abnormal.
(The potential abnormality here refers to a case where the detected potential is lower than the potential even though a certain potential is applied to the shield layer.) When the potential of the shield layer 103b is abnormal, At step 603, a cable abnormality occurrence code "11" is set. Whether or not there is an abnormality in the shield layer 103b, in step 604, it is determined whether the potential of the other shield layer 103a of the two shield layers 103a and 103b is abnormal. If the potential of the shield layer 103a is abnormal, step 605 is performed.
Sets the cable abnormality occurrence code "12".

Next, at step 606, the driving circuit 10
Layer 1 of power supply multiplex communication line 20 transmitted from
Check the 03 potential data. That is, the driving circuit 1
The potentials of the shield layers 103a and 103b of the two power supply multiplex communication lines 20 directly connected to 0 are checked. At step 607, it is determined whether the potential of one of the two shield layers 103a and 103b is abnormal, and if abnormal, at step 608, a cable abnormality occurrence code "21" is set. Next, in step 609, it is determined whether or not the potential of the other shield layer 103b is abnormal.
At 0, the cable abnormality code "22" is set.

Hereinafter, similarly, regarding the driving circuits 12 and 14, the shield layers 103a and 1 of the two power supply multiplex communication lines 20 directly connected to the respective driving circuits 12 and 14 are similarly provided.
Check the potential of 03b. The shield layer 1 of the power multiplex communication line 20 directly connected to the drive circuit 12
If one of 103a and 103b 103a is abnormal, the cable abnormality occurrence code "31" is set (step 613). If the other 103b is abnormal, the cable abnormality occurrence code "32" is set (step 61).
5). Further, if one of the shield layers 103a and 103b of the power multiplex communication line 20 directly connected to the drive circuit 14 has a potential abnormality, the cable abnormality occurrence code "41" is set (step 618), and the other 10
If 3b is a potential error, the cable error code "4
2 "is set (step 620).

The cable abnormality occurrence codes set as described above are collectively checked in step 502 in FIG. 12, and according to the rules shown in the table of FIG.
Of the switching circuit 34 and the switch A or B of the switching circuit 106 of each of the driving circuits 10, 12, 14 are set to OFF.

For example, as shown in FIG.
If the power supply multiplex communication line 20 between the power supply 0 and the drive circuit 12 is short-circuited, steps 608 and 615 in FIG.
Respectively, the cable error occurrence codes "21" and "32"
Is set. Then, in step 502 of FIG. 12, the table of FIG.
If "1" or "32" is set, it is determined that the power supply multiplex communication line 20 between the drive circuit 10 and the drive circuit 12 is short-circuited or disconnected, and the switching circuit 10 of the drive circuit 10
6 are set to turn off and on the switches A and B respectively, and the switching circuit 106 of the drive circuit 12 is set.
Are set to turn on and off the switches A and B, respectively. As a result, as shown in FIG. 15, the switches A and B of the switching circuit 106 of the drive circuit 10 are set to O
The switching circuit 10 of the drive circuit 12
6 switches A and B are turned on and off, respectively.
Power supply multiplex communication line 2 between drive circuit 10 and drive circuit 12
0 is electrically disconnected from the power supply system.

In the above embodiment, only one loop of the power supply line is provided. For example, when the number of loads is very large, as shown in FIG. May be provided with loops A and B composed of a power supply line and a drive circuit. Further, when the number of loads at a specific portion of the vehicle body is extremely large, as shown in FIG.
Two loops C and D composed of a power supply line and a drive circuit may be provided in series with CM3.

The vehicle load driving device according to the embodiment includes a power source (battery 1) for generating electric power supplied to a plurality of loads (40 to 46) provided at various parts of the vehicle body, and a plurality of the loads. A drive circuit that treats one or more predetermined loads as a load group, is provided for each load group, and supplies power from the power source to drive the load for each load that constitutes the load group ( 10, 12, 14), the power supply (battery 1) and a plurality of the driving circuits (10, 12, 1).
And 4) a power supply line for electrically connecting the driving circuit to the driving circuit.
Have two power input terminals (10a, 10b, 12a,...), And the power supply line has a main power supply line (2) connected to the power supply (battery 1) and a bifurcated connection from the main power supply line (2). And two of the plurality of driving circuits (1
0, 14), the branch power supply lines (101A, 101B) connected to the power input terminals (10b, 14a), the power input terminals (10a, 12a) of the drive circuits (10, 12) and the drive circuits (10, 12a). Interconnect power lines (101C, 101D) for interconnecting the power input terminals (12b, 14b) of the different drive circuits (12, 14) with the branch power lines (101A, 101B). A plurality of the driving circuits (10, 12, 14);
C, 101D) is characterized by being electrically connected in a loop.

Here, in the vehicle load drive device, the drive circuit (10, 12, 14) is connected to only one of the two power input terminals (10a) and the drive circuit. The load groups (44, 45,
46) and the load group (44, 45, 46) electrically connected only to the other power input terminal (10b) and the drive circuit. The state of being disconnected and both power input terminals (10a, 10
b) and a switching means (switch A, switch B of the switching circuit 106) capable of switching between a state in which the load group (44, 45, 46) electrically connected to the drive circuit is connected. ), And the branch power supply line (101)
A, 101B) and the interconnecting power supply lines (101C, 10B).
1D) Detection means for detecting at least a short circuit (shield layer 103, communication LSI 107, microcomputer 31)
When the detection means (103, 107, 31) detects a short circuit in any part of the branch power supply line (101A, 101B) and the interconnection power supply line (101C, 101D), The switching means (106) is configured to electrically disconnect the power input terminal connected to the short-circuited power supply line and the load group connected to the drive circuit among the two power input terminals of the circuit. Instruct,
If a short circuit is not detected by the detection means (103, 107, 31), the switching means (106) connects the two power input terminals and the load group connected to the drive circuit. ) Is preferably provided.

In this case, the detecting means (103, 10
7, 31) is a conductive shield layer to which a constant voltage is applied and which covers at least the branch power supply lines (101A, 101B) and the interconnection power supply lines (101C, 101D).
(103) and a plurality of the driving circuits (10, 12, 14).
And a shield layer (103a) that covers the power supply line connected to one power input terminal of the two power input terminals of the drive circuit, and is connected to the other power input terminal. Shield layer covering power line (103b)
Of which shield layer has decreased in potential, and outputs the result of determination to the switching determining means (microcomputer 31).
LSI 107 and microcomputer 31).

Further, in the case where the detection means (shield layer 103, communication LSI 107, microcomputer 31) is provided, if the short circuit is detected by the detection means (103, 107, 31), there is an abnormality in the power supply system. It is preferable to have a warning means (abnormality warning lamp 7) for warning the user.

The above-described vehicle load drive device includes a control means (microcomputer 31) for controlling the operation of the plurality of drive circuits and a plurality of the drive circuits (10, 1).
2, 14) and a communication line for electrically connecting the control means (31), and a plurality of the driving circuits (10, 12, 1).
4) are two signal input terminals (10a, 10a), respectively.
b, 12a,...), and the communication line is bifurcated from the control means (31) to form a plurality of drive circuits (10,
12, 14), the branch communication lines (102A, 102B) connected to the signal input terminals (10b, 14a) of the two drive circuits (10, 14), and the drive circuits (10, 1).
2) signal input terminals (10a, 12a) and the driving circuit (1
0, 12) and the interconnecting communication lines (102C, 102D) interconnecting the signal input terminals (12b, 14b) of the different driving circuits (12, 14).
02A, 102B) and the plurality of drive circuits (10, 1
2, 14) and the interconnect communication lines (102C, 102C).
D) may be electrically connected in a loop shape.

In this case, the branch power supply line (101A, 1
01B) and the branch communication lines (102A, 102B) are both covered with the same outer sheath (sheath 103x) and integrated, and the interconnect power supply lines (101C,
101D) and the interconnect communication lines (102C, 102C).
Both D) are preferably covered and integrated with the same outer skin (sheath 103x).

In the above-described vehicle load drive device, the plurality of drive circuits (10, 12, 14) are provided for each of the loads (44, 45, 46) connected to the drive circuit. A drive element (110a) for supplying power to the load by input of a drive signal, and power from two power input terminals (10a, 10b) to the drive element (110a) is cut off by input of a cutoff signal. The power cutoff means (the switch C of the switching circuit 106) and the driving element (11
0a) and the power cutoff means (106) has a terminal side control means (communication LSI 107) for outputting the cutoff signal to drive the load connected to the drive circuit. It is determined whether or not to drive, and if it is determined to be driven, it is instructed to output the drive signal to the terminal-side control means (107). If not, the terminal-side control means (107) is not driven. ) May be provided with higher-level control means (31) for instructing to output the cutoff signal.

Further, in the above-described load drive device for a vehicle, the plurality of drive circuits (10, 12, 14) are provided for each load connected to the drive circuit, and the load is supplied by input of a drive signal. And a drive element (110a) for supplying power to the drive element (110a), and the drive element (110a) from the two power input terminals (10a, 10b) by input of a cutoff signal.
Power cut-off means (106) for shutting off power to the power supply; terminal-side control means (107) for outputting the drive signal to the drive element (110a) and outputting the cut-off signal to the power cut-off means (106); Device diagnosis means (diagnosis circuit 110b, communication LSI 107) for detecting a failure of the drive element (110a), and the failure of the drive element (110a) is detected by the element diagnosis means (110b, 107). For example, if the terminal side control means (107) is instructed to output the shut-off signal, and if the failure of the drive element (110a) is not detected by the element diagnosis means (110b, 107), the drive element (110a It is determined whether or not the load connected to the terminal is driven, and when it is determined that the load is driven, the terminal-side control means (107) is instructed to output the drive signal. Or it may be provided with a position control means (31).

Further, in the above-described load drive device for a vehicle, the plurality of drive circuits (10, 12, 14) are provided for each load connected to the drive circuit, and the load is controlled by input of a drive signal. A driving element (110a) for supplying electric power to the terminal, a terminal-side control means (107) for outputting the driving signal to the driving element (110a), and a signal from the driving element (110a) to the driving element (110a). Load diagnostic means (communication LSI 107, diagnostic circuit 110b) for detecting an electrical abnormality up to the connected load, and the electrical abnormality must be detected by the load diagnostic means (110b, 107). For example, it is determined whether or not to drive the load connected to the drive circuit, and if it is determined that the load is to be driven, the terminal control unit (107) is instructed to output the drive signal. The load diagnostic means (110b, 1
07), an upper-level control unit (31) for instructing the terminal-side control unit (107) to stop outputting the drive signal when an electrical abnormality is detected may be provided.

A vehicle load drive device that supplies power to a load provided on a vehicle body and drives the load can reduce power consumption. (1) electrically connecting the power supply (1) and the drive element (110a) to the drive element (110a) for supplying the power from the power supply (1) to the load in response to the input of the drive signal; Power lines (101, 10
8), provided in the power supply line (101, 108);
Power cutoff means (106) for cutting off power from the power supply (1) to the drive element (110a) by inputting a cutoff signal
It is determined whether or not to drive the load. If it is determined that the load is to be driven, the drive signal is output to the drive element (110a). Control means (microcomputer 31, communication LSI 107) for outputting the cutoff signal to (106);
It is characterized by having.

Further, the total power supply dose is reduced, the manufacturing cost can be reduced, and the risk of disconnection or short circuit can be reduced. Further, even if the power supply line is disconnected or short-circuited, A load driving device capable of continuously driving a load connected to a power supply line includes a power supply (1) for generating electric power to be supplied to a plurality of loads, and one or more predetermined loads among the plurality of loads. And a drive circuit (10, 12, 14) that is provided for each load group and supplies power from the power supply (1) to drive the load for each load that constitutes the load group. ), A power supply line for electrically connecting the power supply (1) and the plurality of drive circuits, and a current flowing from the power supply (1) to the plurality of drive circuits; Control means for controlling the operation (microcontroller Computer 31), electrically connecting the plurality of drive circuits (10, 12, 14) and the control means (31), and transmitting and receiving between the control means (31) and the plurality of drive circuits. Detecting means for detecting at least a short circuit between the communication line through which the signal passes and the power supply line (the shield layer 10
3, a communication LSI 107, a microcomputer 31), each of the plurality of drive circuits has two power input terminals and two signal input terminals, and the power supply line is connected to the power supply (1). And a power input end (10b, 14) of two drive circuits (10, 14) of the plurality of drive circuits, which are bifurcated from the main power supply line (2).
a) The branch power supply line (101A, 101A) connected to
B) and a power input terminal (1) of the drive circuit (10, 12).
0a, 12a) and interconnecting power supply lines (101C, 101D) interconnecting the driving circuits (10, 12) and the power input terminals (12b, 14b) of the different driving circuits (12, 14). The branch power supply lines (101A, 101B), the plurality of drive circuits (10, 12, 14), and the interconnecting power supply lines (101C, 101D) are electrically connected in a loop, and the communication line Are branched communication lines (102A, 102A, 102B) connected to signal input terminals (10b, 14a) of two drive circuits (10, 14) of the plurality of drive circuits. 102B),
The signal input terminals (10a, 1) of the drive circuits (10, 12)
2a) and interconnecting communication lines (102C, 102D) interconnecting the drive circuits (10, 12) and signal input terminals (12b, 14b) of different drive circuits (12, 14). The communication lines (102A, 102B), the plurality of drive circuits (10, 12, 14), and the interconnect communication lines (102C, 102D) are electrically connected in a loop, and the drive circuit (10 , 12, 14) are only one of the two power input terminals (10a, 10b) and the load group (44, 45, 46) connected to the drive circuit. Are electrically disconnected from each other, and only the other power input terminal (10b) is electrically disconnected from the load group electrically connected to the drive circuit. The input end (10a,
10b) and a switching means (106) capable of switching between a state in which the load group electrically connected to the drive circuit is connected to the load group, and the control means (31).
When the detecting means (103, 107, 31) detects a short circuit in any part of the branch power supply line (101A, 101B) and the interconnecting power supply line (101C, 101D), The switching means (106) is configured to electrically disconnect the power input terminal connected to the short-circuited power supply line and the load group connected to the drive circuit among the two power input terminals of the circuit. If the short circuit is not detected by the detection means (103, 107, 31), the switching is performed so that the two power input terminals and the load group connected to the drive circuit are connected. It is characterized by instructing the means (106).

In the above description, the reference numerals in parentheses after the respective constituent elements are the reference numerals assigned to the corresponding parts in the “embodiment”.

In this embodiment, since the branch power supply line, the plurality of drive circuits, and the interconnection power supply line are electrically connected in a loop, a plurality of loads or a plurality of drive circuits are supplied from the power supply. Rather than preparing one power supply line at a time and connecting the power supply with multiple loads or multiple drive circuits in an octopus configuration,
The total power supply dose can be significantly reduced. As a result, the manufacturing cost can be reduced, and the risk of disconnection or short circuit can be reduced.

Further, in this embodiment, a plurality of driving circuits
Each of the two power input terminals is provided, and the power from the power supply is supplied to the two power input terminals, that is, since the power supply line to the drive circuit is duplicated, the two power input terminals are provided. Even if a power supply line directly connected to one power input terminal is short-circuited or disconnected, power can be continuously supplied to the drive circuit from a power supply line directly connected to the other power input terminal. Therefore, even if a part of the power supply line is short-circuited or disconnected, power can be supplied to the load connected to the drive circuit and the load can be driven.

In the apparatus having the switching means and the detecting means, the detecting means detects a short circuit between the branch power supply line and the interconnecting power supply line. When the short circuit is detected, the switching means electrically connects the power input terminal connected to the short-circuited power supply line and the load connected to the drive circuit among the two power input terminals of the drive circuit. Be separated. Since the above operation is performed for each drive circuit,
The short-circuited power supply line is disconnected from the power supply system. By the way, when the power supply line is short-circuited, the power consumption becomes extremely large, and there is a risk that a fire may occur at the short-circuited portion. Therefore, in those having the switching means and the detecting means,
The short-circuited power supply line is electrically disconnected from the power supply system, so that unnecessary power consumption is eliminated and a fire at the short-circuited portion can be avoided.

[0080]

According to the present invention, the branch power supply line, the plurality of drive circuits, and the interconnection power supply lines are electrically connected in a loop, so that the power supply and the plurality of loads are connected like an octopus. The total power supply dose can be much lower than connecting to Therefore, the manufacturing cost can be reduced, and the risk of disconnection or short circuit can be reduced.
Further, in the present invention, two power input terminals are provided in each of the plurality of drive circuits, and power from the power supply is supplied to the two power input terminals. Even if the power supply line directly connected to the input end is short-circuited or disconnected, power can be supplied to the drive circuit from the power supply line directly connected to the other power input end. Therefore, even if a part of the power supply line is short-circuited or disconnected, power can be supplied to the load connected to the drive circuit and the load can be driven.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a vehicle load drive device according to an embodiment of the present invention.

FIG. 2 is a cutaway perspective view of a main part of a power multiplex communication line according to an embodiment of the present invention.

FIG. 3 is a circuit block diagram in a BCM according to an embodiment of the present invention.

FIG. 4 is a circuit block diagram in a drive circuit of one embodiment according to the present invention.

FIG. 5 is a communication LSI and an IPD according to an embodiment of the present invention;
FIG.

FIG. 6 is a judgment table for judging whether the power supply system according to the embodiment of the present invention is normal or abnormal.

FIG. 7 is a schematic circuit diagram of a power supply system according to an embodiment of the present invention.

FIG. 8 is a schematic circuit diagram of a signal system of one embodiment according to the present invention.

FIG. 9 is a flowchart showing an LCU communication interruption process of the BCM according to the embodiment of the present invention.

FIG. 10 is a flowchart showing a drive circuit communication interrupt process of a BCM according to an embodiment of the present invention.

FIG. 11 is a flowchart illustrating background job processing of a BCM according to an embodiment of the present invention.

FIG. 12 is a flowchart showing a process at the time of abnormality of a BCM according to an embodiment of the present invention.

FIG. 13 is a flowchart illustrating a power supply multiplex communication line abnormality detection process of the BCM according to the embodiment of the present invention.

FIG. 14 is a table showing a failure occurrence section and an appropriate switch state, which are indicated by an abnormality occurrence code according to one embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a state of the drive circuit when the power multiplex communication line is short-circuited in the vehicle load drive device according to one embodiment of the present invention.

FIG. 16 is a circuit diagram of a power supply system of a vehicle load drive device according to another embodiment of the present invention.

FIG. 17 is a circuit diagram of a power supply system of a vehicle load drive device according to still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Battery, 2 ... Main power supply line, 3 ... BCM (multiplex communication control device), 4, 102 ... Multiple communication line, 5, 6 ... LCU
(Local station for multiplex communication), 7 ... Error warning lamp, 1
0, 12, 14 ... Drive circuits, 10a, 10b, 12a,
12b, 14a, 14b input terminal, 20 power supply multiplex communication line, 31 microcomputer, 34 switching circuit, 4
0 to 46: load, 101: power line, 101A, 101B
... branch power supply line, 101C, 101D ... interconnection power supply line,
102A, 102B ... branch communication line, 102C, 102D
... interconnection communication line, 103 ... shield layer, 106 ... power supply switching circuit, 107 ... communication LSI, 110, 111, 11
2. IPD, 110a driving element, 110b diagnostic circuit.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat 参考 (Reference) H02J 7/00 H02J 7/00 S 302 302B (72) Inventor Hiroyuki Saito 2520 No. Daiba Takaba, Hitachinaka City, Ibaraki Prefecture F-term (reference) in the Automotive Equipment Division of Hitachi, Ltd. 5G003 DA02 DA14 EA04 FA06 GA01 GC05

Claims (21)

[Claims] 1. A vehicle load driving device for driving a load provided in a vehicle by supplying power from a vehicle-mounted power supply to the load, comprising: at least one power input terminal; A drive circuit that supplies the input power to the load to drive the load, a control circuit that controls the drive circuit, and a power supply line that supplies power to the drive circuit from the power input terminal. And a power line to the control circuit. 2. A vehicle load driving device for driving a load provided in a vehicle by supplying power from a vehicle-mounted power supply, the load driving device having one or more power input terminals, and A drive circuit that supplies the input power to the load to drive the load, a control circuit that controls the drive circuit, and a power supply line that supplies power to the drive circuit from the power input terminal. And a power line to the control circuit, and a diode between the power input terminal and the power line to the control circuit. 3. A vehicular load driving apparatus for driving a load provided in a vehicle by supplying power from an on-vehicle power supply, the load driving device having one or more power input terminals, and A drive circuit that supplies the input power to the load and drives the load; and a power supply line that supplies power to the drive circuit from the power input terminal. Vehicle load drive device characterized by the following. 4. A load driving device for a vehicle for driving each load by supplying power from a power supply to each load provided at various points of a vehicle body, wherein at least one of a plurality of said predetermined loads is A plurality of drive circuits that drive a load; and a power supply line that electrically connects the power supply and the plurality of drive circuits. The plurality of drive circuits each have two power input terminals. A main power supply line connected to the power supply;
A branch power supply line that is bifurcated from the main power supply line and is connected to power input terminals of two of the plurality of drive circuits; and a power input terminal of the drive circuit and a drive that is different from the drive circuit. An interconnecting power supply line interconnecting a power input end of a circuit, wherein the branch power supply line, the plurality of drive circuits, and the interconnecting power supply line are electrically connected in a loop. A load drive device for a vehicle, comprising: 5. The load drive device for a vehicle according to claim 4, wherein the drive circuit includes only one of the two power input terminals and the load group connected to the drive circuit. Is electrically disconnected, only the other power input terminal and the load group electrically connected to the drive circuit are electrically disconnected, and both power input terminals Switching means for switching between a state in which the load group electrically connected to the drive circuit is connected to the load group, wherein at least a short circuit between the branch power supply line and the interconnection power supply line is detected Detecting means for detecting a short circuit in any part of the branch power supply line and the interconnecting power supply line by the detecting means, of the two power input terminals of the drive circuit, Power input connected to Instructing the switching means to electrically disconnect the terminal and the load group connected to the drive circuit, and if the detection means does not detect a short circuit, the two power input terminals and the drive circuit Switch instructing means for instructing the switching means to connect the load group connected to the vehicle. 6. The load drive device for a vehicle according to claim 5, wherein the detecting means is a conductive shield layer to which a constant voltage is applied and which covers at least the branch power supply line and the interconnecting power supply line. A shield layer is provided for each of the plurality of drive circuits and covers the power supply line connected to one of the two power input terminals of the drive circuit, and the other power input terminal is connected to the shield layer. Between the shield layer covering the power supply line and the potential of any of the shield layers,
And a potential displacement determining means for outputting the result of determination to the switching instruction means. 7. The load drive device for a vehicle according to claim 5, further comprising a warning unit that warns that there is an abnormality in a power supply system when the detection unit detects a short circuit. Load drive device for vehicles. 8. The load drive device for a vehicle according to claim 4, wherein the control means controls operation of the plurality of drive circuits, and the plurality of drive circuits and the control means are electrically connected. A communication line to be connected, wherein each of the plurality of drive circuits has two signal input terminals; and wherein the communication line is bifurcated from the control means and includes two drive circuits of the plurality of drive circuits. A branch communication line connected to a signal input end of the drive circuit; and an interconnect communication line interconnecting a signal input end of the drive circuit and a signal input end of a drive circuit different from the drive circuit. A load drive device for a vehicle, wherein a line, a plurality of the drive circuits, and the interconnect communication line are electrically connected in a loop. 9. The load driving device for a vehicle according to claim 8, wherein the branch power supply line and the branch communication line are both integrated by being covered with the same outer skin, and the interconnection power supply line and the interconnection are connected to each other. A load driving device for a vehicle, wherein the communication line and the communication line are both covered with the same outer skin and integrated. 10. A load driving device for a vehicle according to claim 4, wherein a plurality of said driving circuits are provided for each of the loads connected to said driving circuit, and the plurality of driving circuits are provided by input of a driving signal. A drive element for supplying power to the load, power cutoff means for cutting off power from the two power input terminals to the drive element by inputting a cutoff signal, and outputting the drive signal to the drive element. A terminal-side control unit that outputs the cut-off signal to the power cut-off unit; and determines whether to drive a load connected to the drive circuit. Higher-level control means for instructing the side-side control means to output the drive signal and instructing the terminal-side control means to output the cutoff signal when it is determined that the drive is not to be performed. Vehicle negative Drive. 11. The vehicle load drive device according to claim 4, wherein a plurality of the drive circuits are provided for each load connected to the drive circuit, and the drive circuit receives a drive signal. A drive element for supplying power to the load, power cutoff means for cutting off power from the two power input terminals to the drive element by inputting a cutoff signal, and outputting the drive signal to the drive element. A terminal-side control unit that outputs the cutoff signal to the power cutoff unit; and an element diagnosis unit that detects a failure of the drive element. If the failure of the drive element is detected by the element diagnosis unit, Instruct the terminal-side control means to output the cutoff signal, and if the failure of the drive element is not detected by the element diagnosis means, determine whether to drive the load connected to the drive element. The load If it is determined that is moving, the terminal controller that has a higher control means for instructing to output the drive signal to the vehicle load driving apparatus according to claim. 12. The vehicle load drive device according to claim 11, further comprising a warning unit for warning that there is an abnormality in a power supply system when the element diagnosis unit detects a failure of the drive element. A load drive device for a vehicle. 13. The load drive device for a vehicle according to claim 4, wherein a plurality of the drive circuits are provided for each load connected to the drive circuit, and the plurality of drive circuits are provided by input of a drive signal. A drive element for supplying power to the load, terminal-side control means for outputting the drive signal to the drive element, and an electrical connection between the drive element and the load connected to the drive element. Load diagnostic means for detecting an abnormality, and if no electrical abnormality is detected by the load diagnostic means, it is determined whether to drive the load connected to the drive circuit, and it is determined that the load is driven. In this case, the terminal-side control unit is instructed to output the drive signal, and if the load diagnosis unit detects an electrical abnormality, the terminal-side control unit is instructed to stop outputting the drive signal. Higher-level control means Vehicle load driving apparatus characterized by being e. 14. A load driving device for a vehicle according to claim 13, wherein said load diagnosis means detects an electrical abnormality.
A load drive device for a vehicle, comprising: a warning unit for warning that there is an abnormality in a power supply system. 15. The load drive device for a vehicle according to claim 4, wherein a plurality of the drive circuits are provided for each load connected to the drive circuit, and the plurality of drive circuits are provided by input of a drive signal. A drive element for supplying power to the load, power cutoff means for cutting off power from the two power input terminals to the drive element by inputting a cutoff signal, and outputting the drive signal to the drive element. Terminal-side control means for outputting the cut-off signal to the power cut-off means; element diagnosis means for detecting a failure of the drive element; and electric power from the drive element to the load connected to the drive element. Load diagnostic means for detecting a mechanical abnormality, and when the element diagnostic means detects a failure of the drive element, instructs the terminal-side control means to output the shutoff signal, and the load diagnostic means Electrical abnormalities If detected, the terminal side control means is instructed to stop outputting the drive signal, and the failure of the drive element is not detected by the element diagnosis means and an electrical abnormality must be detected by the load diagnosis means. For example, it is determined whether or not to drive the load connected to the drive element. If it is determined that the load is to be driven, the terminal-side control unit is instructed to output the drive signal, and Is determined not to drive
A load driving device for a vehicle, comprising: a higher-level control unit that instructs the terminal-side control unit to output the cutoff signal. 16. The load drive device for a vehicle according to claim 15, wherein a failure of said drive element is detected by said element diagnosis means or an electrical abnormality is detected by said load diagnosis means. And a warning means for warning that there is an abnormality in the power supply system. 17. A vehicular load driving device that supplies power from a vehicle-mounted power supply to a load provided in a vehicle and drives the load, wherein power from the power supply is supplied to the load by inputting a drive signal. A power supply line that electrically connects the power supply and the drive element; and a power cutoff unit that is provided in the power supply line and that cuts off power from the power supply to the drive element when a cutoff signal is input. It is determined whether or not to drive the load, and when it is determined to drive, the drive signal is output to the drive element,
And a control means for outputting the cutoff signal to the power cutoff means when it is determined that the power is not to be driven. 18. A vehicle load driving device for driving a load provided on a vehicle body by supplying power from an on-vehicle power supply, the vehicle load driving device having two power input terminals, and inputting the power from the power input terminal. A drive circuit that supplies power to the load to drive the load; and a power supply line that electrically connects the power supply and the two power input terminals of the drive circuit. Vehicle load drive device characterized by the following. 19. A load driving device for supplying power to a plurality of loads and driving each load, wherein a power source for generating power to be supplied to the plurality of loads, and A drive circuit that treats one or more loads as a load group, is provided for each load group, and supplies power from the power supply to drive the load for each load constituting the load group; A power supply line that electrically connects the plurality of drive circuits to each other and through which a current flows from the power supply to the plurality of drive circuits; a control unit that controls operations of the plurality of drive circuits; Electrically connecting a circuit and the control means,
A communication line through which signals transmitted / received between the control unit and the plurality of drive circuits pass; and a detection unit configured to detect at least a short circuit of the power supply line. A power input end and two signal input ends, wherein the power supply line is a main power supply line connected to the power supply;
A branch power supply line that is bifurcated from the main power supply line and is connected to power input terminals of two of the plurality of drive circuits, and a power input terminal of the drive circuit and a drive circuit different from the drive circuit; An interconnecting power supply line interconnecting a power input end, wherein the branch power supply line, the plurality of drive circuits, and the interconnecting power supply line are electrically connected in a loop shape; A branch communication line that is bifurcated from the control means and is connected to signal input terminals of two of the plurality of drive circuits, and a signal input terminal of the drive circuit and a drive circuit different from the drive circuit. An interconnect communication line interconnecting the signal input terminals of the plurality of drive circuits, wherein the branch communication line, the plurality of drive circuits, and the interconnect communication line are electrically connected in a loop, The circuit comprises: A state in which only one of the power input terminals is electrically disconnected from the load group connected to the drive circuit; and a state in which only the other power input terminal is electrically connected to the drive circuit. Switching means capable of switching between a state in which the power group is electrically separated from the power group and a state in which both power input terminals and the load group electrically connected to the drive circuit are connected. When the control unit detects a short circuit in any part of the branch power supply line and the interconnecting power supply line by the detection unit, the control unit includes, among the two power input terminals of the drive circuit, Instructs the switching means to electrically disconnect the power input terminal connected to the short-circuited power supply line and the load group connected to the drive circuit, and if the short-circuit is not detected by the detection means, The two power inputs A load driving apparatus for instructing the switching means to keep the load group connected to the drive circuit connected. 20. The load driving device according to claim 19, wherein said detecting means is provided with a conductive shield layer to which a constant voltage is applied and which covers at least said branch power supply line and said interconnection power supply line. The shield layer is provided for each drive circuit and covers the power supply line connected to one power input terminal of the two power input terminals of the drive circuit, and the shield layer is connected to the other power input terminal. And a potential displacement judging means for judging which of the shield layers among the shield layers covering the power supply lines has decreased in potential and outputting the judgment result to the control means. Load drive. 21. The load drive device according to claim 20, wherein the branch power supply line and the branch communication line are both covered with the same outer cover and integrated, and the interconnection power supply line and the interconnection communication line are integrated. Is a load drive device characterized by being covered with the same outer skin and integrated.