JP2018087612A - Drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device having a less increased number of components.SOLUTION: A drive control device 100 control the drive of a linear solenoid valve 2 and an on-off solenoid valve 3. The drive control device 100 includes a linear switching element 22 provided on an energization passage from a DC power supply 5 to a coil 2a of the linear solenoid valve 2, a linear drive signal output part for outputting a linear drive signal to the linear switching element 22 to change a value for a current flowing in the coil 2a, an on-off switching element 23 provided on an energization passage from the DC power supply 5 to a coil 3a of the on-off solenoid valve 3, an on-off drive signal output part for outputting an on-off drive signal to the on-off switching element 23 to switch a current flowing in the coil 3a between an on-state and an off-state, and a current detection circuit 25 for detecting a value for a current on a joint passage joining the current flowing in the coil 2a and the current flowing in the coil 3a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive control device that drives and controls a solenoid valve.

  Conventionally, a drive control device that drives and controls a solenoid valve is known. The drive control device disclosed in Patent Document 1 includes a current sensor that detects a value of a current flowing through a coil of a solenoid valve. This current sensor individually corresponds to a plurality of solenoid valves, and is provided in the same number as the solenoid valves.

JP 2013-204785 A

  However, in the drive control device of Patent Document 1, when the number of solenoid valves to be driven is increased, the number of current sensors is increased by the same number. That is, as the number of solenoid valves increases, the number of parts for detecting the current value increases in direct proportion, and there may be a concern that the manufacturing cost will increase, for example.

  Now, as a drive control device for the solenoid valve, there are a linear solenoid valve that can linearly control the position of the plunger in accordance with the value of the current flowing through the coil, an on state in which current flows through the coil, and an off state in which current is interrupted. There is a case where the on / off solenoid valve that switches the position of the plunger according to the drive control is controlled by one drive control device. Thus, when driving and controlling two types of solenoid valves, there is room for suppressing an increase in the number of parts by sharing a current detection circuit for detecting a current value with the two types of solenoid valves. The present inventor has found that

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a drive control device that suppresses an increase in the number of components.

In the present invention, the linear solenoid valve (2) capable of linearly controlling the position of the plunger in accordance with the value of the current flowing through the coil (2a), the ON state in which a predetermined current flows through the coil (3a), and the current are cut off. A drive control device that drives and controls an on / off solenoid valve (3) that switches a position of the plunger according to an off state;
A linear switching element (22) provided on the energization path from the DC power source (5) to the coil of the linear solenoid valve;
A linear drive signal output section (32) for outputting a linear drive signal for changing a current value flowing through the coil of the linear solenoid valve toward the linear switching element;
An on / off switching element (23) provided on the energization path from the DC power source to the coil of the on / off solenoid valve;
An on / off drive signal output section (34) for outputting an on / off drive signal for switching between an on state and an off state for the current flowing through the coil of the on / off solenoid valve toward the on / off switching element;
A current detection circuit (25, 325) for detecting a current value on a merging path obtained by merging the current flowing through the coil of the linear solenoid valve and the current flowing through the coil of the on-off solenoid valve;

  According to such an invention, the current flowing through the coil of the linear solenoid valve and the current flowing through the coil of the on / off solenoid valve are merged, and the current value on the merge path is detected. In particular, since the coil of the on / off solenoid valve can take only two states, an on state and an off state, it is relatively easy to distinguish which solenoid valve the current in the merged state on the merge path flows from. . Therefore, the current detection circuit can be made common to the two types of solenoid valves, and a drive control device that suppresses an increase in the number of parts can be provided.

It is a circuit diagram which shows schematic structure of the drive control apparatus and solenoid valve of 1st Embodiment. It is a functional block diagram of the microcomputer of a 1st embodiment. It is the time chart which showed an example for demonstrating drive control of the linear solenoid valve of 1st Embodiment. It is the time chart which showed an example for demonstrating operation | movement of the abnormality determination part of 1st Embodiment. It is a figure which shows the temperature map of 1st Embodiment. It is a flowchart which shows the determination process of the circuit abnormality by the abnormality determination part of 1st Embodiment. It is a flowchart which shows the determination process of the circuit abnormality by the abnormality determination part of 1st Embodiment. It is a flowchart which shows the control process of the duty ratio by the linear drive signal output part of 1st Embodiment. It is a flowchart which shows the calculation process of the current offset value of 1st Embodiment. It is a functional block diagram of the microcomputer of a 2nd embodiment. It is a figure which shows the temperature map of 2nd Embodiment, Comprising: The initial state is shown. It is a figure which shows the temperature map of 2nd Embodiment, Comprising: The map after update (after learning) is shown. It is a flowchart which shows the update process of the map of 2nd Embodiment. It is a circuit diagram which shows schematic structure of the drive control apparatus and solenoid valve of 3rd Embodiment.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
As shown in FIG. 1, a drive control apparatus 100 according to a first embodiment of the present invention is mounted on a vehicle and a plurality of solenoid valves 2 and 3 provided in a hydraulic circuit for operating an automatic transmission of the vehicle. Is driven and controlled. In recent years, the number of stages of automatic transmissions for vehicles has been increasing, and along with this, the number of solenoid valves 2 and 3 is also increasing.

  In such an automatic transmission, a plurality of types of solenoid valves 2 and 3 are selectively used depending on the application. As a kind of such solenoid valve, the on / off solenoid valve 3 switches the position of the plunger in accordance with an on state in which a predetermined current flows through the coil 3a and an off state in which the current is interrupted. The on / off solenoid valve 3 can switch the hydraulic pressure in two stages by opening or closing the hydraulic port according to the two states of the on state and the off state of the plunger.

  As another type of solenoid valve, the linear solenoid valve 2 can linearly control the position of the plunger in accordance with the value of the current flowing through the coil 2a. Since the spool moves linearly by controlling the position of the plunger linearly, the linear solenoid valve 2 can adjust the hydraulic pressure in multiple stages or continuously, instead of simply switching the hydraulic pressure to two stages. Yes.

  The drive control device 100 according to the present embodiment controls and drives both the linear solenoid valve 2 and the on / off solenoid valve 3 simultaneously. Specifically, the drive control device 100 is an electronic control unit (Electronic Control Unit) including a plurality of terminals 10a, 10b, and 12, a power supply voltage monitor 14, a plurality of drive circuit units 20, and a microcomputer. The coils 2a and 3a of the solenoid valves 2 and 3 of the automatic transmission and the terminals 10a, 10b and 12 of the drive control device 100 are electrically connected via the vehicle harness. Specifically, one ends 2b and 3b of the coils 2a and 3a are electrically connected to terminals 10a and 10b individually corresponding to the solenoid valves 2 and 3, respectively. The other ends 2c and 3c of the coils 2a and 3a are electrically connected to each other between one unit of the linear solenoid valve 2 and the on / off solenoid valve 3 to form a merging path. Is connected to a terminal 12 provided on the terminal. In this way, the drive control device 100 can control the current flowing through the coils 2a and 3a.

  The power supply voltage monitor 14 detects the voltage value of the DC power supply 5 connected to the drive control device 100.

  The drive circuit unit 20 is a circuit for driving the solenoid valves 2 and 3 through the coils 2a and 3a. The drive circuit unit 20 is provided for each corresponding one unit of the solenoid valves 2 and 3, so that a plurality of the drive valves are provided as a whole. Is provided. Since each drive circuit unit 20 has the same configuration, a single drive circuit unit 20 will be described below as a representative. The drive circuit unit 20 includes a plurality of switching elements 22 and 23 and a current detection circuit 25.

  The switching elements 22 and 23 are provided corresponding to the solenoid valves 2 and 3 individually. Among the switching elements 22 and 23, the linear switching element 22 corresponding to the linear solenoid valve 2 is provided on the energization path from the DC power supply 5 to the coil of the linear solenoid valve 2. Specifically, a MOSFET is employed as the linear switching element 22, and when the MOSFET is turned on, the DC power supply 5 and the terminal 10a are electrically connected, and a current flows through the coil 2a. In particular, the MOSFET of this embodiment is an n-channel type, with the drain on the DC power supply 5 side and the source on the coil 2a side.

  Among the switching elements 22 and 23, the on / off switching element 23 corresponding to the on / off solenoid valve 3 is provided on the energization path from the DC power supply 5 to the coil 3 a of the on / off solenoid valve 3. Specifically, a MOSFET is employed as the on / off switching element 23. When the MOSFET is turned on, the DC power supply 5 and the terminal 10b are electrically connected, and a current flows through the coil 3a. In particular, the MOSFET of this embodiment is an n-channel type, with the drain on the DC power supply 5 side and the source on the coil 3a side.

  One current detection circuit 25 is provided for each unit of the linear solenoid valve 2 and the on / off solenoid valve 3. The current detection circuit 25 includes a shunt resistor 26 and an operational amplifier 27. One end of the shunt resistor 26 is connected between the terminal 10 b and the non-inverting input terminal of the operational amplifier 27. The other end of the shunt resistor 26 is connected to the inverting input terminal of the operational amplifier 27, and between the terminal 10a and the switching element 22 and between the terminal 10b and the switching element 23 via a rectifying element such as a diode 28. It is connected to the. The operational amplifier 27 amplifies the voltage generated across the shunt resistor 26 and outputs the amplified voltage to the microcomputer 30. With such a circuit configuration, the current detection circuit 25 joins the current value ISH flowing through the shunt resistor 26, in other words, the current flowing through the coil 2a of the linear solenoid valve 2 and the current flowing through the coil 3a of the on-off solenoid valve 3. The current value on the merged path is detected.

  The microcomputer 30 has a processor such as a CPU, a memory such as a ROM and a RAM, an I / O port, and the like. The microcomputer 30 performs various signal processing in accordance with a program stored in advance in the memory. As a functional block realized by the microcomputer 30, the drive control apparatus 100 includes a linear drive signal output unit 32, an on / off drive signal output unit 34, an abnormality determination unit 36, and a map storage unit 38, as shown in FIG. 2. The map resistance value estimating unit 40 and the current offset value calculating unit 42 are provided.

  The linear drive signal output unit 32 outputs a linear drive signal for changing the current value flowing through the coil 2a of the linear solenoid valve 2 to the linear switching element 22 (to the gate of the MOSFET in this embodiment). The linear drive signal is a signal (so-called pulse width modulation signal) that changes the value of the current flowing through the coil 2a of the linear solenoid valve 2 by changing its duty ratio. Thereby, when the linear solenoid valve 2 is driven, the value of the current flowing through the linear solenoid valve 2 is variable, for example, between 0.2 and 1A.

  The on / off drive signal output unit 34 outputs an on / off drive signal for switching between an on state and an off state for the current flowing through the coil 3a of the on / off solenoid valve 3 toward the on / off switching element 23 (the gate of the MOSFET in this embodiment). . As a result, the on / off solenoid valve 3 switches between the on state of 1A and the off state of 0A, for example, of the current value flowing through the coil 3a.

  Here, as shown in FIG. 3, the linear drive signal output unit 32 is connected to the shunt resistance detected by the current detection circuit 25 during the current stabilization period of the coil 3 a of the on / off solenoid valve 3 during the drive of the linear solenoid valve 2. The feedback control is performed by correcting and setting the duty ratio from the current value ISH flowing through the output current 26 and the instruction current value ILIN of the linear drive signal output unit 32. Thereby, even if the command current value ILIN which is the current value of the control target of the linear drive signal output unit 32 and the current value flowing through the actual coil 2a are deviated, they are corrected as needed so that they approach or match. .

  In particular, when the coil 3a of the on / off solenoid valve 3 is in the on state, the current value ISH flowing through the shunt resistor 26 includes the current value flowing through the coil 3a of the on / off solenoid valve 3, so that the linear drive signal output unit 32 includes the shunt resistor 26. The duty ratio is feedback-controlled based on a value obtained by offsetting a current offset value IOFF, which is a current value expected to flow to the coil of the on / off solenoid valve 3 from the current value flowing through the current.

  However, the linear drive signal output unit 32 stops the feedback control and controls the duty ratio of the linear drive signal to a constant value during the current unstable period of the coil 3a of the on / off solenoid valve 3. The unstable current period corresponds to the period during which the driving state of the on / off solenoid valve 3 is switched, and is, for example, a predetermined period from when the on / off driving signal is switched on and off, during which there is a problem such as flyback, The current value ISH flowing through the shunt resistor 26 changes suddenly and becomes unstable.

  The abnormality determination unit 36 shown in FIG. 2 determines a circuit abnormality using the current value ISH flowing through the shunt resistor 26 detected by the current detection circuit 25. Specifically, the abnormality determination unit 36 compares the current value ISH that flows through the shunt resistor with the design current value ISOL that is assumed to flow through the indicated current value ILIN and the coil 3a of the on / off solenoid valve 3, Judge abnormalities.

  When the coil 3a of the on / off solenoid valve 3 is in the off state, the current value ISH flowing through the shunt resistor 26 is substantially equal to the current value flowing through the coil 2a of the linear solenoid valve 2, and therefore an abnormality is determined based on this premise. On the other hand, when the coil 3a of the on / off solenoid valve 3 is on, the current value ISH flowing through the shunt resistor 26 is the sum of the current value flowing through the coil 2a of the linear solenoid valve 2 and the current value flowing through the coil 3a of the on / off solenoid valve 3. Therefore, the abnormality is determined based on this assumption.

  Here, as illustrated in FIG. 4, the abnormality determination unit 36 of the present embodiment performs abnormality determination only during the abnormality detection period, and stops abnormality determination during the non-detection period. Here, the non-detection period is between the switching of the driving state of the linear solenoid valve 2 corresponding to the current detection circuit 25 and the switching of the driving state of the on / off solenoid valve 3. For example, a predetermined period corresponds to a non-detection period from when the indicated current value ILIN of the linear drive signal output unit 32 is changed, and when the on / off drive signal is switched on and off, and the shunt resistor 26 is set during this period. The flowing current value ISOL changes suddenly and becomes unstable. The abnormality detection period is a period excluding the non-detection period.

  The map storage unit 38 illustrated in FIG. 2 stores a temperature map indicating the temperature dependence characteristics of the resistance value in the coil 3a of the on / off solenoid valve 3. Specifically, as shown in FIG. 5, the temperature map of the present embodiment includes the oil temperature TATF of the automatic transmission oil controlled by the on / off solenoid valve and the resistance value RS of the coil 3 a of the on / off solenoid valve 3. It is a map showing the relationship.

  The map resistance value estimation unit 40 acquires a temperature corresponding value corresponding to the temperature of the coil 3a of the on / off solenoid valve 3 by the temperature sensor 4, and estimates the resistance value RS of the coil 3a from the temperature corresponding value by a temperature map. Here, as the temperature corresponding value, the temperature of the coil of the on / off solenoid valve 3 itself may be employed, but in the present embodiment, the above-described oil temperature TATF is employed. Since it is difficult to directly determine the resistance value RS by measuring the coil temperature, the oil temperature TATF is measured as an alternative, and the resistance value RS of the coil 3a is estimated from the oil temperature TATF using a temperature map. is there. In addition, the temperature sensor 4 uses what was provided in the automatic transmission.

  The current offset value calculation unit 42 calculates a current offset value IOFF from the voltage of the DC power supply 5 and the resistance value RS of the coil 3 a estimated by the map resistance value estimation unit 40. The current offset value IOFF is obtained by dividing the voltage VBAT of the DC power supply 5 by the estimated resistance value RS.

  Processing performed by the drive control device 100 provided with such a function will be described based on the flowcharts of FIGS.

  First, circuit abnormality determination processing by the abnormality determination unit 36 will be described with reference to the flowcharts of FIGS.

  In step S101 of FIG. 6, it is determined whether or not the present is the abnormality detection period. If a positive determination is made in step S101, the process proceeds to step S102. If a negative determination is made in step S101, the determination in step S101 is performed again after a predetermined time has elapsed.

  In step S102, the current value ISH flowing through the shunt resistor 26 is acquired. After the process of step S102, the process proceeds to step S103.

  In step S103, it is determined whether the command current value ILIN of the linear drive signal output unit 32 is 0 A, that is, whether the linear solenoid valve 2 is in a drive state. If a positive determination is made in step S103, the process proceeds to step S104. If a negative determination is made in step S103, the process proceeds to step S121 in FIG.

  In step S104 of FIG. 6, it is determined whether or not the coil 3a of the on / off solenoid valve 3 is in an off state. If a positive determination is made in step S104, the process proceeds to step S105. If a negative determination is made in step S104, the process proceeds to step S108.

  In step S105, it is determined whether or not the current value ISH flowing through the shunt resistor 26 is 0A. If a positive determination is made in step S105, the process proceeds to step S106. If a negative determination is made in step S105, the process proceeds to step S107.

  In step S106, it is determined that the circuit is normal. A series of processing is complete | finished by step S106.

  In step S107, it is determined that the circuit is abnormal. Specifically, as an abnormality, the failure of the switching elements 22 and 23 (MOS on failure) or the downstream of the switching elements 22 and 23 to the upstream of the shunt resistor 26, on the energization path to the coils 2a and 3a, Judge that a short circuit has occurred. A series of processing is complete | finished by step S107.

  In step S108 when the coil 3a of the on / off solenoid valve 3 is in the on state, the current value ISH flowing through the shunt resistor 26 is set to the designed current value ISOL of the coil 3a of the on / off solenoid valve 3 and the current value ISOL is set. It is determined whether or not it is larger than a value obtained by adding a normal design allowable value α. If a positive determination is made in step S108, the process proceeds to step S109. If a negative determination is made in step S108, the process proceeds to step S110.

  In step S109, it is determined that the circuit is abnormal. Specifically, it is determined that an overcurrent (rare short) has occurred in the circuit as an abnormality. A series of processing is complete | finished by step S109.

  In step S110, it is determined whether or not the current value ISH flowing through the shunt resistor 26 is larger than a value obtained by subtracting a design allowable value α that makes the current value ISOL normal from the design current value ISOL. If a positive determination is made in step S110, the process proceeds to step S111. If a negative determination is made in step S110, the process proceeds to step S112.

  In step S111, it is determined that the circuit is abnormal. Specifically, as an abnormality, disconnection, short circuit with GND on the energization path from the downstream of the switching elements 22 and 23 to the upstream of the shunt resistor 26 and the coils 2a and 3a, or failure of the switching elements 22 and 23 (MOS off failure) ) Has occurred. A series of processing is complete | finished by step S111.

  In step S112, it is determined that the circuit is normal. A series of processing is complete | finished by step S112.

  In step S121 of FIG. 7, it is determined whether or not the coil 3a of the on / off solenoid valve 3 is in an off state. If a positive determination is made in step S121, the process proceeds to step S122. If a negative determination is made in step S121, the process proceeds to step S125.

  In step S122, whether or not the current value ISH flowing through the shunt resistor 26 is greater than the value obtained by adding the design allowable value β that makes the current value ILIN normal to the instruction current value ILIN of the linear drive signal output unit 32. Determine whether. If a positive determination is made in step S122, the process proceeds to step S123. If a negative determination is made in step S122, the process proceeds to step S124.

  In step S123, it is determined that the circuit is normal. A series of processing is complete | finished by step S123.

  In step S124, it is determined that the circuit is abnormal. Specifically, as an abnormality, the failure of the switching elements 22 and 23 (MOS on failure) or the downstream of the switching elements 22 and 23 to the upstream of the shunt resistor 26, on the energization path to the coils 2a and 3a, Judge that a short circuit has occurred. A series of processing is complete | finished by step S124.

  In step S125 when the coil 3a of the on / off solenoid valve 3 is in the on state, the current value ISH flowing through the shunt resistor 26 is a value obtained by adding the design allowable value α to the design current value ISOL, and the indication current. It is determined whether or not the sum is greater than the sum of the value ILIN and the design allowable value β. If a positive determination is made in step S125, the process proceeds to step S126. If a negative determination is made in step S125, the process proceeds to step S127.

  In step S126, it is determined that the circuit is abnormal. Specifically, it is determined that an overcurrent (rare short) has occurred in the circuit as an abnormality. A series of processing is complete | finished by step S126.

  In step S127, the current value ISH flowing through the shunt resistor 26 is obtained by subtracting the design allowable value α from the design current value ISOL and the value obtained by subtracting the design allowable value β from the indicated current value ILIN. It is determined whether it is smaller than the sum. If a positive determination is made in step S127, the process proceeds to step S128. If a negative determination is made in step S127, the process proceeds to step S129.

  In step S128, it is determined that the circuit is abnormal. Specifically, as an abnormality, disconnection, short circuit with GND on the energization path from the downstream of the switching elements 22 and 23 to the upstream of the shunt resistor 26 and the coils 2a and 3a, or failure of the switching elements 22 and 23 (MOS off failure) ) Has occurred. A series of processing is complete | finished by step S128.

  In step S129, it is determined that the circuit is normal. A series of processes are complete | finished by step S129.

  Next, the duty ratio control processing by the linear drive signal output unit 32 will be described with reference to the flowchart of FIG.

  In step S141, the current value ISH flowing through the shunt resistor 26 is acquired. After the process of step S141, the process proceeds to step S142.

  In step S142, the command current value ILIN of the linear drive signal output unit 32 is acquired. After the process of step S142, the process proceeds to step S143.

  In step S143, it is determined whether or not the present is the current stabilization period. If a positive determination is made in step S143, the process proceeds to step S144. If a negative determination is made in step S143, the process proceeds to step S155.

  In step S144, it is determined whether or not the coil 3a of the on / off solenoid valve 3 is in an off state. If a positive determination is made in step S144, the process proceeds to step S145. If a negative determination is made in step S144, the process proceeds to step S150.

  In steps S145 to S149, the above-described feedback control is performed. Specifically, in step S145, a deviation is calculated from the current value ISH flowing through the shunt resistor 26 and the command current value ILIN of the linear drive signal output unit. In step S146, a duty ratio proportional to the derivative of the deviation calculated in step S145 is calculated. In step S147, a duty ratio proportional to the integral of the deviation calculated in step S145 is calculated. In step S148, the duty ratio is calculated based on the calculation results of steps S146 and S147. In step S149, a linear drive signal is output at a duty ratio based on the calculation result in step S148. A series of processing is complete | finished by step S149.

  In steps S150 to S154, the above-described feedback control is performed. However, unlike steps S145 to S149, the duty ratio is calculated after offsetting the current offset value IOFF from the current value ISH flowing through the shunt resistor 26.

  Specifically, in step S150, a deviation is calculated from a value obtained by offsetting (that is, subtracting) the current offset value IOFF from the current value ISH and the instruction current value ILIN. In step S151, a duty ratio proportional to the derivative of the deviation calculated in step S150 is calculated. In step S152, the duty ratio proportional to the integral of the deviation calculated in step S150 is calculated. In step S153, the duty ratio is calculated based on the calculation results of steps S151 and S152. In step S154, a linear drive signal is output at a duty ratio based on the calculation result of step S153. A series of processing is complete | finished by step S154.

  On the other hand, in step S155 when the current is an unstable current period, the duty ratio is controlled to a constant value. Specifically, the duty ratio is set to a value proportional to a predetermined current value ILIN of the linear drive signal output unit 32. In step S156 after the processing in step S155, a linear drive signal is output at the duty ratio controlled to the constant value. A series of processing is complete | finished by step S156.

  Next, the calculation process of the current offset value IOFF by the map storage unit 38, the map resistance value estimation unit 40, and the current offset value calculation unit 42 will be described with reference to the flowchart of FIG.

  In step S161, the power supply voltage monitor 14 acquires the voltage VBAT of the DC power supply 5. After the process of step S161, the process proceeds to step S162.

  In step S162, the oil temperature TATF of the automatic transmission oil is acquired. After the process of step S162, the process proceeds to step S163.

  In step S163, the map resistance value estimation unit 40 estimates the resistance value RS of the coil 3a of the on / off solenoid valve 3 from the temperature map and the oil temperature TATF. After the process of step S163, the process proceeds to step S164.

  In step S164, the current offset value calculation unit 42 calculates the current value ISOLC flowing through the coil 3a of the on / off solenoid valve 3 from the voltage VBAT of the DC power supply 5 and the resistance value RS estimated in step S163. After the process of step S164, the process proceeds to step S165.

  In step S165, the current value ISOLC calculated in step S164 is substituted for the current offset value IOFF. A series of processing is complete | finished by step S165.

(Function and effect)
The operational effects of the first embodiment described above will be described below.

  If the current flowing through the coils of two solenoid valves of the same type is merged and the current value on the merge path is detected, the solenoid valve from which the current caused by the current value flows is distinguished. It is difficult. However, according to the first embodiment, the current flowing through the coil 2a of the linear solenoid valve 2 and the current flowing through the coil 3a of the on / off solenoid valve 3 are merged, and the current value of the merged state on the merge path is detected. It has become. In particular, since the coil 3a of the on / off solenoid valve 3 can take only two states, an on state and an off state, it is relatively easy to distinguish which solenoid valve 2 and 3 the current on the junction path flows from. Become. Therefore, the current detection circuit 25 can be made common to the two types of solenoid valves 2 and 3, and the drive control device 100 that suppresses the increase in the number of components can be provided.

  Further, according to the first embodiment, the duty ratio of the linear drive signal is controlled based on a value obtained by offsetting the current offset value from the current value on the merge path. Since the current offset value is a current value that is expected to flow through the coil 3a of the on / off solenoid valve 3, the current value flowing through the coil 2a of the linear solenoid valve 2 can be distinguished by offsetting the current offset value. . Therefore, even if the current detection circuit 25 is configured to be shared by the two types of solenoid valves 2 and 3, the duty ratio is controlled after the current value flowing through the coil 2a of the linear solenoid valve 2 is distinguished. The linear solenoid valve 2 can be driven and controlled with high accuracy.

  Further, according to the first embodiment, the current offset value is calculated from the voltage of the DC power supply 5 and the resistance value estimated from the temperature map indicating the temperature dependence characteristics. Accordingly, the temperature offset of the coil 3a is reflected in the current offset value, and the coil of the linear solenoid valve 2 can be used even if the current detection circuit 25 is shared by the two types of solenoid valves 2 and 3. Since the current value flowing through 2a can be accurately distinguished, the linear solenoid valve 2 can be driven and controlled satisfactorily.

  Further, according to the first embodiment, the duty ratio of the linear drive signal is controlled to a constant value while the drive state of the on / off solenoid valve 3 is switched. If a sudden current fluctuation occurs during switching, the current flowing through the coil 2a of the linear solenoid valve 2 cannot be distinguished. If feedback control is continued at this time, the influence of the on / off solenoid valve 3 that cannot be distinguished is included in the calculation of the duty ratio, and there is a concern that the control of the linear solenoid valve 2 becomes unstable. However, in the present embodiment, the duty ratio is a constant value without being affected by the linear drive signal during switching, so that the linear solenoid valve 2 can be stably driven and controlled.

  Further, according to the first embodiment, the circuit abnormality is determined using the current value on the merge path. When an abnormality is determined in this manner, even if the current detection circuit 25 is configured to be shared by two types of solenoid valves, it is possible to easily detect an overcurrent in which a larger current than designed is assumed. A high abnormality discrimination function can be realized.

  Further, according to the first embodiment, the abnormality determination is stopped during the switching of the driving state of the linear solenoid valve 2 and during the switching of the driving state of the on-off solenoid valve 3. Although sudden current fluctuation occurs during such switching, it is possible to avoid a situation in which an abnormality is erroneously detected by stopping the abnormality determination.

(Second Embodiment)
As shown in FIGS. 10 to 13, the second embodiment of the present invention is a modification of the first embodiment. The second embodiment will be described with a focus on differences from the first embodiment.

  As illustrated in FIG. 10, the drive control apparatus 100 according to the second embodiment further includes an actual resistance value calculation unit 244 and a map update unit 246 as functional blocks realized by the microcomputer 230.

  When the linear drive signal output from the linear drive signal output unit 32 is a signal for stopping the drive of the linear solenoid valve 2 (that is, a signal for making the current flowing through the coil 2a non-current) The resistance value RS of the coil 3a of the on / off solenoid valve 3 is calculated from the voltage VBAT of the DC power supply 5 and the current value ISH flowing through the shunt resistor 26. The resistance value RS is obtained by dividing the voltage VBAT by the current value ISH.

  The map update unit 246 updates the temperature map using the resistance value RS of the coil 3a calculated by the actual resistance value calculation unit 244 as a learning value. Specifically, as shown in FIGS. 11 and 12, the map update unit 246 divides the oil temperature TATF as the temperature corresponding value of the coil 3a into a plurality of temperature zones in the temperature map, and the actual resistance value calculation unit 244 It is determined to which temperature zone the oil temperature TATF when the resistance value RS is calculated belongs. Then, the function is modified so that the function of the temperature map that characterizes the temperature characteristic of the temperature zone to which the oil temperature TATF belongs is placed on the resistance value RS calculated by the actual resistance value calculation unit 244. For example, the function of the temperature map is corrected from the initial state in FIG. 11 to the state after learning in FIG. In this way, the map update unit 246 updates the temperature map. In the present embodiment, the temperature zone is divided into a low temperature region, a middle temperature region, and a high temperature region.

  The map update processing by the actual resistance value calculation unit 244 and the map update unit 246 will be described with reference to the flowchart of FIG.

  In step S201, it is determined whether or not only the on / off solenoid valve 3 among the solenoid valves 2 and 3 of one unit is in a driving state (on state). If a positive determination is made in step S201, the process proceeds to step S202. If a negative determination is made in step S201, the determination in step S201 is performed again after a predetermined time has elapsed.

  In step S 202, the voltage VBAT of the DC power supply 5 is acquired by the power supply voltage monitor 14. After the process of step S202, the process proceeds to step S203.

  In step S203, the current value ISH flowing through the shunt resistor 26 is acquired. After the process of step S203, the process proceeds to step S204.

  In step S <b> 204, the actual resistance value calculation unit 244 calculates the resistance value RS of the coil 3 a of the on / off solenoid valve 3. After the process of step S204, the process proceeds to step S205.

  In step S205, the current oil temperature TATF for the on / off solenoid valve 3 is acquired. After the process of step S205, the process proceeds to step S206.

  In step S206, it is determined whether or not the oil temperature TATF is smaller than the boundary value T1 between the low temperature region and the middle temperature region. If a positive determination is made in step S206, the process proceeds to step S207. If a negative determination is made in step S206, the process proceeds to step S209.

  In step S207, the oil temperature TATF is substituted for the low temperature region temperature LT. After the process of step S207, the process proceeds to step S208.

  In step S208, the resistance value RS calculated in step S204 is substituted for the low temperature region resistance value RSL. After the process of step S208, the process proceeds to step S214.

  In step S209 when the oil temperature TATF is not in the low temperature range, it is determined whether the oil temperature TATF is smaller than the boundary value T2 between the middle temperature range and the high temperature range. If a positive determination is made in step S209, the process proceeds to step S210. If a negative determination is made in step S209, the process proceeds to step S212.

  In step S210, the oil temperature TATF is substituted for the intermediate temperature region temperature MT. After the process of step S210, the process proceeds to step S211.

  In step S211, the resistance value RS calculated in step S204 is substituted for the intermediate temperature range resistance value RSM. After the process of step S211, the process proceeds to step S214.

  In the case where the oil temperature TATF is neither in the low temperature region nor in the middle temperature region, that is, in the high temperature region, the oil temperature TATF is substituted for the high temperature region temperature HT. After the process of step S212, the process proceeds to step S213.

  In step S213, the resistance value RS calculated in step S204 is substituted for the high temperature region resistance value RSH. After the process of step S213, the process proceeds to step S214.

  In step S214, the temperature map is updated from the latest learned values of the low temperature region temperature LT and the low temperature region resistance value RSL, the intermediate temperature region temperature MT and the intermediate temperature region resistance value RMS, or the high temperature region temperature HT and the high temperature region resistance value RSH. A series of processes are complete | finished by step S214.

  According to the second embodiment described above, the temperature map is updated with the calculated actual resistance value. By such an update, even if there is an individual difference in the circuit of the drive control device 100 or the coil of each solenoid valve, the individual difference can be corrected, so that the current offset value becomes more accurate. Therefore, since the current value flowing through the coil 2a of the linear solenoid valve 2 can be accurately distinguished, the linear solenoid valve 2 can be driven and controlled satisfactorily.

(Third embodiment)
As shown in FIG. 14, the third embodiment of the present invention is a modification of the first embodiment. The third embodiment will be described with a focus on differences from the first embodiment.

  In the drive circuit unit 320 of the third embodiment, one unit of the solenoid valves 2 and 3 corresponding to one current detection circuit 325 includes one linear solenoid valve 2 and a plurality of (two in this embodiment) on-off solenoid valves. 3. In other words, the current detection circuit 325 detects a current value on a merging path in which a current flowing through the coil 2a of one linear solenoid valve 2 and a current flowing through the coils 3a of the plurality of on / off solenoid valves 3 are merged.

  Specifically, one ends 2b and 3b of the coils 2a and 3a are electrically connected to terminals 10a and 10b individually corresponding to the solenoid valves 2 and 3, respectively. The other ends 2c and 3c of the coils 2a and 3a are electrically connected to each other between one unit of the solenoid valves 2 and 3 constituted by one linear solenoid valve 2 and a plurality of on / off solenoid valves 3. Thus, it is connected to the terminal 12 provided for each unit.

  The linear drive signal output unit 32 according to the third embodiment is configured to turn on / off solenoid valves among the on / off solenoid valves 3 from the current value ISH flowing through the shunt resistor 26 (in other words, the current value on the merging path). 3 is controlled based on a value obtained by offsetting the sum of the current offset values IOFF for 3.

  According to the third embodiment described above, since the current detection circuit 325 is shared by the three or more solenoid valves 2 and 3, the effect of suppressing the increase in the number of parts is further enhanced.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  Specifically, as the first modification, for example, an IGBT or the like other than the MOSFET may be employed as the switching elements 22 and 23.

  As a second modification, terminals 12 corresponding to the other ends 2c and 3c of the coils 2a and 3a may be individually provided for the solenoid valves 2 and 3, and currents may be combined by a circuit in the drive control device 100. .

  As a third modification related to the second embodiment, the number of divisions of the temperature zone of the temperature map may be two, or four or more.

  As a fourth modification related to the third embodiment, one unit of the solenoid valves 2 and 3 corresponding to one current detection circuit 325 includes one linear solenoid valve 2 and three or more on / off solenoid valves 3. Also good.

  As a fifth modification, the drive control device 100 may partially include a configuration in which one solenoid valve 2 or 3 corresponds to one current detection circuit 25.

  As a sixth modification, a current offset value IOFF that is a current value that is expected to flow from the current value (for example, current value ISH) on the merging path to the on / off solenoid in feedback control for the linear solenoid valve 2 is set. Based on the offset value, if the duty ratio is controlled so that the command current value ILIN and the actual current value flowing through the coil 2a are close to or coincide with each other, the specific duty ratio is determined. Various calculation methods can be adopted as the calculation method.

  2 linear solenoid valve, 2a coil, 3 on / off solenoid valve, 3a coil, 22 linear switching element, 23 on / off switching element, 25, 325 current detection circuit, 32 linear drive signal output section, 34 on / off drive signal output section

Claims (8)

A linear solenoid valve (2) capable of linearly controlling the position of the plunger in accordance with the value of the current flowing through the coil (2a), an on state in which a predetermined current flows through the coil (3a), and an off state in which the current is interrupted A drive control device for driving and controlling an on-off solenoid valve (3) for switching the position of the plunger in response,
A linear switching element (22) provided on a current-carrying path from a DC power source (5) to the coil of the linear solenoid valve;
A linear drive signal output unit (32) for outputting a linear drive signal for changing a current value flowing through the coil of the linear solenoid valve toward the linear switching element;
An on / off switching element (23) provided on an energization path from the DC power source to the coil of the on / off solenoid valve;
An on / off drive signal output section (34) for outputting an on / off drive signal for switching between the on state and the off state for the current flowing through the coil of the on / off solenoid valve toward the on / off switching element;
A drive control device comprising: a current detection circuit (25, 325) that detects a current value on a merging path obtained by merging a current flowing through the coil of the linear solenoid valve and a current flowing through the coil of the on-off solenoid valve. The linear drive signal is a signal for changing the current value flowing through the coil of the linear solenoid valve by changing its duty ratio,
The linear drive signal output unit calculates the duty ratio based on a value obtained by offsetting a current offset value that is a current value that is expected to flow to the coil of the on / off solenoid valve from a current value on the merging path. The drive control apparatus of Claim 1 which controls. A map storage unit (38) for storing a temperature map indicating a temperature dependence characteristic of a resistance value in the coil of the on / off solenoid valve;
A map resistance value estimation unit (40) that obtains a temperature corresponding value corresponding to the temperature of the coil of the on / off solenoid valve by a temperature sensor, and estimates the resistance value from the temperature corresponding value by the temperature map;
The drive control device according to claim 2, further comprising: a current offset value calculation unit (42) that calculates the current offset value from the voltage of the DC power supply and the estimated resistance value. When the linear drive signal is a signal for stopping the driving of the linear solenoid valve, an actual resistance value calculation for calculating the resistance value from the voltage of the DC power supply and the current value on the junction path in the current detection circuit Part (244),
The drive control device according to claim 3, further comprising a map update unit (246) that updates the temperature map with the resistance value calculated by the actual resistance value calculation unit.   5. The drive control device according to claim 2, wherein the linear drive signal output unit controls the duty ratio of the linear drive signal to a constant value during switching of the drive state of the on / off solenoid valve. 6.   The drive control apparatus according to any one of claims 1 to 5, further comprising an abnormality determination unit (36) that determines a circuit abnormality using a current value on the merging path.   The drive control device according to claim 6, wherein the abnormality determination unit stops determining abnormality during switching of the driving state of the linear solenoid valve and switching of the driving state of the on / off solenoid valve. A plurality of the on / off solenoid valves are provided,
The current detection circuit detects a current value on the merging path obtained by merging a current flowing through the coil of the linear solenoid valve and a current flowing through the coils of the plurality of on-off solenoid valves. The drive control apparatus according to claim 1.

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