JP3173685B2 - Wiper intermittent control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper intermittent control device used for wiping a wiping surface such as a windshield glass by operating a wiper motor. The present invention relates to an intermittent wiper control device that operates intermittently.

[0002]

2. Description of the Related Art An intermittent wiper control device for automatically intermittently operating a wiper motor in response to the running of a vehicle is disclosed in Japanese Patent Publication No. 3-46339.

In the intermittent wiper control device described in the above publication, when an intermittent mode having a pause time selected by a wiper switch is set, a running signal from a vehicle speed sensor is generated by stopping the vehicle from a running state. When the vehicle is stopped, the wiper is driven in an intermittent mode having a pause time set by the wiper switch within a predetermined time after the vehicle stops, and if there is no running signal from the vehicle speed sensor after the predetermined time has passed. Then, the wiper is driven by switching to a new intermittent mode having a pause time longer than the pause time set by the wiper switch.

[0004]

In the above-mentioned conventional intermittent wiper control device, the wiper is operated in the intermittent mode having the idle time selected by the wiper switch because the running signal generated by the vehicle speed sensor exists while the vehicle is running. In addition to driving, the wiper is driven in an intermittent mode having a pause time set by a wiper switch within a predetermined time after the vehicle stops from a running state, so that the vehicle temporarily stops due to traffic congestion or the like, for example. If the vehicle repeatedly travels at a low speed, or stops slightly on an uphill slope and then starts and then moves back and forth, the traveling signal will be present and it will be suitable for traveling. Since the switch to the intermittent mode having the pause time set by the wiper switch is performed, the occupant is almost in the vehicle. Although it is recognized that the wiper is stopped, there is a problem that the wiper continuously performs driving for driving and driving for stopping, which may be troublesome, and solves this problem. That was an issue.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper intermittent control device capable of performing fine intermittent control of a wiper without giving an occupant any trouble. .

[0006]

Configuration of the Invention

[0007]

SUMMARY OF THE INVENTION An intermittent wiper control device according to the present invention is an intermittent wiper control device for a vehicle, and includes a power supply side fixed contact (2b2) and a ground side fixed contact (2b3).
A wiper motor (2) having a fixed position stop switch (2b) having a movable contact (2b1) driven by rotation of a motor shaft (2a); and a movable contact (RL1-2) connected to the wiper motor. A relay (RL1) having a first fixed contact (RL1-3) connected to a movable contact of a fixed position stop switch and a second fixed contact (RL1-4) connected to a common potential; By supplying current to the relay, the movable contact of the relay is connected to the second fixed contact, and by turning off, the current flowing through the relay is interrupted and the movable contact of the relay is switched to the first fixed contact. It has a first switch means (TR2, TR3) for connecting to a fixed contact, and a sensor (3) for detecting a running state and a stopped state of the vehicle, generates a running signal during running of the vehicle, and stops the vehicle. Then, stop detection means (4) for generating a stop signal When, by the traveling signal the first switching means to generate an output signal for intermittently driving the on state or an off state, the stop detection means for generating,
In a wiper intermittent control device including a timer for shortening a time for maintaining the off state, the timer includes a capacitor (C) having one terminal connected to a common potential, and a movable contact between the capacitor and the fixed position stop switch. And a first resistor group (R1) connected in series with each other and connected in series with each other to generate a reference voltage.
0, R11, R12), one input terminal is connected to the other terminal of the capacitor, and a reference voltage is supplied to the other input terminal from the first resistor group to generate the above-mentioned output signal (COM). , A collector terminal is connected to the other terminal of the capacitor, a base terminal is connected to the first resistor group, and a transistor (TR
5) and a plurality of resistors connected in series with each other,
A second resistor group (R8, R9) connected to the emitter terminal of the transistor; and a running signal connected to the second resistor group and the sensor and generated by the stop detecting means, to determine the resistance of the second resistor group. A second switch means (TR4) for short-circuiting one of them is provided.

[0008]

In the wiper intermittent control device according to the present invention, a capacitor (C) having one terminal connected to a common potential, a collector terminal connected to the other terminal of the capacitor, and a base terminal connected to the first terminal. Resistance County (R10, R11, R1
2), a transistor (TR5) for supplying a charging potential to the capacitor, and a plurality of resistors connected in series to each other, and a second resistor group (R8, R9) connected to the emitter terminal of the transistor. ). Therefore, when the vehicle stops from the running state and when the vehicle runs from the stopping state, the time until the current of the capacitor exceeds a predetermined value is set to be different from each other, so that the intermittent pause time is set. The intermittent operation corresponding to the occupant's recognition is performed.

[0009]

1 to 4 show an embodiment of an intermittent wiper control apparatus according to the present invention. FIG. 1 is an overall circuit configuration diagram, and FIGS. 2 and 3 explain how to set an intermittent idle time. FIG. 4 and FIG. 4 are explanatory diagrams of the operation.

The illustrated wiper intermittent control device 1 mainly includes a wiper motor 2, a vehicle speed sensor 3, and control means 7, and the control means 7 includes a stop detection means 4
And an intermittent means 5 having a timer 6 (capacitor C).

The wiper motor 2 has a motor shaft 2a connected to a wiper arm via a link (not shown). The rotational power of the motor shaft 2a causes the wiper arm to move between a lower inverted position (stop position) and an upper inverted position on the wiping surface. The wiping surface is swung back and forth to wipe the wiping surface with a wiper blade attached to the wiper arm. Further, the wiper motor 2 has a built-in fixed position stopping mechanism 2b. A movable contact 2b that is switched to and connected to the power supply-side fixed contact 2b2 and the ground-side fixed contact 2b3 for each rotation of the motor shaft 2a.
The movable contact 2b1 is connected to the power-side fixed contact 2b2 when the wiper arm is at the lower inverted position, and is connected to the ground-side fixed contact 2b3 when the wiper arm is not at the lower inverted position. The fixed position stop mechanism 2b is provided with the movable contact 2 until the wiper arm reaches the lower reverse position even if the supply of current to the wiper motor 2 is interrupted by stopping the power supply 50.
b1 is connected to the ground-side fixed contact 2b3 to continuously supply current to the wiper motor 2, and when the wiper arm reaches the lower inverted position, the movable contact 2b1 is connected to the power-supply-side fixed contact 2b2, so that the motor shaft 2a is stopped to stop the wiper arm at a predetermined lower turning position.

The power brush terminal 2c of the wiper motor 2 includes a power source 50, a power source-side fixed contact 2b2, and a control means 7.
Are connected to a power supply terminal 7a provided in each of them.
The low-speed brush terminal 2d of the wiper motor 2 is connected to a motor terminal 7b provided in the control means 7, and the movable contact 2b1 of the fixed position stop mechanism 2b is connected to the control means 7b.
Is connected to the position signal input terminal 7c provided in the terminal.

The vehicle speed sensor 3 is a reed switch that is linked to the rotation of the wheels. One end of the vehicle speed sensor 3 is connected to a vehicle speed signal input terminal 7d provided in the control means 7, and the other end is grounded. The vehicle speed sensor 3 generates a traveling signal as a pulse signal as needed when the vehicle travels, and does not generate a traveling signal when the vehicle stops.

On the other hand, the control means 7 includes a stop detecting means 4 having a built-in output transistor TR1, a first relay driving transistor TR2 and a second relay driving transistor TR2 constituting a driving circuit.
The transistor TR3 for driving the relay, the transistor TR4 for changing the intermittent rest time and the transistor T for setting the intermittent time
R5, comparator COM and capacitor C, intermittent means 6, relay RL1, circuit configuration resistors R1, R
2, R3, R4, R5, R6, R7, R8, R9, R1
0, R11, R12, R14, R15, diode D
1. Zener diodes ZD1 and ZD2 are provided. Power supply 5 is provided by resistor R1 and Zener diode ZD1.
The potential supplied from 0 is constant.

The stop detecting means 4 is configured to turn on the output transistor TR1 when there is a vehicle speed signal from the vehicle speed sensor 3, and to turn off the output transistor TR1 when there is no vehicle speed signal from the vehicle speed sensor 3. Yes,
When the output transistor TR1 is in the ON state, the output goes to a low level, which is a detection signal, and the output transistor TR1
In the off state, the output becomes the high level which is the stop detection signal. When the output goes low due to the output transistor TR1 being turned on, a function is provided to turn on the intermittent pause time changing transistor TR4 provided in the intermittent means 6 via the resistors R6 and R7.

The relay RL1 is connected to a relay coil RL1-1.
Is excited, the relay movable contact RL1-2 is connected from the normally closed fixed contact RL1-3 to the normally open fixed contact RL1-4, so that the relay movable contact RL1-2 has a function of forming an energizing path for the wiper motor 2. Relay coil RL1-1 of relay RL1
One is on the power supply 50 side, the other is the collector of the second relay driving transistor TR3 and the Zener diode Z
Since it is connected to D2, it is excited with a constant current when the second relay driving transistor TR3 is turned on.

The comparator COM provided in the intermittent means 5 inputs the potential divided by the combined resistance value of the resistors R10 and R11 and the resistance value of the resistor R12 via the resistor R13 to a positive input. , A reference potential is set. The resistors R8 and R9 connected to the collector of the intermittent time setting transistor TR5 via the intermittent time setting transistor TR5.
The capacitor C whose current set by the timer 6 is the timer 6
And the capacitor C is connected to the minus input via the resistor R14, so that the potential of the capacitor C is the comparison potential.

Here, the collector of the intermittent pause time changing transistor TR4 is connected to the connection point between the resistors R8 and R9. The charging path of C is via only the resistor R9, and if the intermittent pause time changing TR4 is in the off state, the charging path of the capacitor C is via the resistor R8 and the resistor R9. When the pause time changing TR4 is in the ON state, the time during which the charge of the capacitor C increases is short, and when the intermittent pause time changing TR4 is in the OFF state, the time during which the charge of the capacitor C increases is long.

When the charge of the capacitor C exceeds the reference potential, the output of the comparator COM is inverted.
The discharge path of the capacitor C is a resistor R15, a diode D
1, the movable contact 2b1 of the fixed position stop mechanism 2b provided on the wiper motor 2 is formed every time the movable contact 2b1 is connected to the ground-side fixed contact 2b3, so that the capacitor C is connected every time the motor shaft 2a of the wiper motor 2 makes one rotation. Is discharged.

The output of the comparator COM goes to a high level where the time until the charged potential of the capacitor C exceeds the reference potential becomes an intermittent pause time, and goes to a low level after the charged potential of the capacitor C exceeds the reference potential. The first relay driving transistor TR2 whose base current is set by the resistors R4 and R5 is turned on when the output of the comparator COM is at a low level and turned off when the output of the comparator COM is at a high level. Causes intermittent driving. When the first relay driving transistor TR2 is turned on intermittently, the second relay driving transistor TR3 whose base current is set by the resistors R2 and R3 is also driven intermittently. 2 relay drive transistor TR3 intermittently turns on, relay coil RL1-1
Are intermittently excited. The relay movable contact RL1-2 is intermittently excited by the relay coil RL1-1.
Are normally closed fixed contacts RL1-3 to normally open fixed contacts RL1-4.
Are connected intermittently to form an energization path for the wiper motor 2, so that the wiper motor 2 is intermittently driven,
The wiper arm swings back and forth between the lower reversal position (stop position) and the upper reversal position on the wiping surface, thereby wiping the wiping surface once with the wiper blade. When the wiper arm makes one reciprocation and reaches the lower reversing position, the movable contact 2b1 of the fixed position stopping mechanism 2b is connected to the power supply side fixed contact 2b2, so that the motor shaft 2a is stopped by armature short and the wiper arm is reversed at a predetermined lower position. Stop in position. Movable contact 2 of fixed position stop mechanism 2b
When the capacitor b1 is connected to the fixed contact 2b2 on the power supply side, the capacitor C starts the charging because the discharging path is cut off. While the capacitor C is charging, the comparator CO
Since the output of M goes to a high level, the transistor TR2 for relay driving is also turned off, so that the time when the transistor TR2 for relay driving is in the off state is an intermittent pause time, and the wiper motor 2 is immobilized.

Here, as is apparent from FIG. 2, when the vehicle is running, there is a vehicle speed signal from the vehicle speed sensor 3, and the stop detecting means 4 outputs the output signal because the output transistor TR1 is on. Is at a low level,
Since the intermittent pause time changing transistor TR4 is turned on by the low level of the output of the stop detecting means 4, the charging path of the capacitor C is only via the resistor R9, and the comparison potential VC is used as a reference in the comparator COM. The time required to exceed the potential VR is short. Therefore, if the vehicle stops at the position A in FIG. 2 before the comparison potential VC exceeds the reference potential VR, the vehicle speed signal from the vehicle speed sensor 3 disappears, and the stop detecting means 4 turns off the output transistor TR1. Becomes high level, and the intermittent pause time changing transistor TR4 is turned off. When the intermittent pause time changing transistor TR4 is turned off, the charging path of the capacitor C becomes the resistor R
8 and the resistor R9, the time required for the comparison potential VC to reach the reference potential VR in the comparator COM becomes long, and the charge potential charged in the running state is stopped and then charged. The comparison potential VC is constituted by the charged potential.

As is clear from FIG. 3, when the vehicle is stopped, there is no vehicle speed signal from the vehicle speed sensor 3, so that the stop detecting means 4 turns off the output transistor TR1 and the output becomes high level. The intermittent pause time changing transistor TR4 is off. Since the intermittent pause time changing transistor TR4 is turned off, the charging path of the capacitor C passes through the resistor R8 and the resistor R9. Therefore, until the comparison potential VC reaches the reference potential VR in the comparator COM. Time is long. Therefore, when the vehicle starts running at the position B in FIG. 3 before the comparison potential Vc exceeds the reference potential VR, the stop detection means 4 turns on the output transistor TR1 because the vehicle speed signal from the vehicle speed sensor 3 is present. When the output becomes low level, the intermittent pause time changing transistor T
Since R4 is turned on and the charging path of the capacitor C is via only the resistor R9, the time required for the comparison potential VC to exceed the reference potential VR in the comparator COM is short, and the charging performed in the stopped state is short. The comparison potential VC is constituted by the potential and the charging potential after the start of traveling.

The wiper intermittent control device 1 having such a structure performs control based on the operation procedure shown in FIG. When the power is turned on while the vehicle is running, the determination in step 101 is YES, and in step 102, the charging coefficient Δt for the capacitor C is set to the numerical value a, that is, the charging path via the resistor R9. Is set and the numerical value a
The charging potential T is detected by charging with the charging coefficient Δt, and the current supply to the wiper motor 3 is not performed in the execution step 105 until the charging potential T exceeds the comparison potential which is the set value in the determination step 104. When the charging potential T exceeds the comparison potential, which is the set value, the current is supplied to the wiper motor 3 in the execution step 106. That is, the output transistor TR1 of the stop detecting means 4
Is turned on, and the intermittent pause time changing transistor TR4 is turned on by turning on the output transistor TR1, so that the charging path of the capacitor C is formed via the resistor R9.
Since the comparison potential VC exceeds the reference potential VR in a short time in the comparator COM, an intermittent pause time having a short pause time is set.
Are inverted after a short time, and then the first relay transistor TR2 and the second relay driving transistor TR3
Are turned on, and the relay RL1 is driven to drive the wiper motor 2 intermittently through a short intermittent pause time.

If the determination in step 101 is NO due to the stop of the vehicle, an execution step 107 determines the charging coefficient Δt for the capacitor C.
Is set as a numerical value b, that is, a charging path via the resistors R8 and R9. In the execution step 103, the charging is performed with the charging coefficient Δt of the numerical value b to detect the charging potential T. Is not supplied to the wiper motor 3 in the execution step 105 until the charging potential T exceeds the comparison potential which is the set value. If the charging potential T exceeds the comparison potential which is the set value in the determination step 104, the current is supplied to the wiper motor 3 in the execution step 106. Perform That is, when the vehicle stops, the output transistor TR of the stop detecting means 4
1 is off, and the intermittent pause time changing transistor TR4 is turned off by turning off the output transistor TR1.
Since the charging path of the capacitor C is formed through the resistors R8 and R9, the intermittent rest time having a long rest time is set by the comparison potential VC exceeding the reference potential VR in the comparator COM for a long time. , The comparator COM is inverted after a long time and
Are turned on, the relay RL1 is driven, and the wiper motor 2 is driven intermittently through a long intermittent pause time.

[0025]

As described above, the wiper intermittent control device according to the present invention has the above-described structure, and therefore performs an intermittent operation corresponding to the occupant's recognition.
As a result, the occupant is not bothered, and an excellent effect that fine intermittent wiper control can be performed is achieved.

[Brief description of the drawings]

FIG. 1 is an overall circuit configuration diagram of an embodiment of a wiper intermittent control device according to the present invention.

FIG. 2 is an explanatory diagram showing how to set an intermittent pause time in the wiper intermittent control device shown in FIG. 1;

FIG. 3 is an explanatory diagram of how to set an intermittent rest time in the wiper intermittent control device shown in FIG. 1;

FIG. 4 is an operation explanatory diagram of the wiper intermittent control device shown in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 intermittent wiper control device 2 wiper motor 4 stop detection means 6 timer C capacitor COM comparator D1 diode R8 second resistance group R9 second resistance group RL1 relay TR2 first switch means TR3 second switch means TR4 second switch Means TR5 Transistor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-32329 (JP, A) JP-A-61-60352 (JP, A) Fully open Showa 54-17546 (JP, U) Really open Showa 61- 122148 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60S 1/08 H02P 7/06

Claims (1)

(57) [Claims] An intermittent wiper control device for a vehicle, comprising: a power supply side fixed contact (2b2), a ground side fixed contact (2b3), and a movable contact (2b1) driven by rotation of a motor shaft (2a). A wiper motor (2) having a fixed position stop switch (2b) having a movable contact (RL1-2) connected to the wiper motor;
A relay (RL1) having a first fixed contact (RL1-3) connected to a movable contact of the fixed position stop switch and a second fixed contact (RL1-4) connected to a common potential; By being in a state, a current is supplied to the relay to connect a movable contact of the relay to a second fixed contact,
A first switch means (TR2, TR3) for interrupting a current flowing through the relay and connecting a movable contact of the relay to a first fixed contact by being turned off; A stop detecting means (4) having a sensor (3) for detecting, generating a running signal while the vehicle is running, and generating a stop signal when the vehicle stops; turning on or off the first switch means; A wiper intermittent control device, comprising: a timer for generating an output signal intermittently driving the state, and a timer for shortening a time for maintaining the off state by a traveling signal generated by the stop detection unit. Capacitor (C) with one terminal connected to a common potential
And a diode (D1) connected to the capacitor and a movable contact of the fixed position stop switch and configured to flow a discharge current of the capacitor, and a first resistor group (R10, R10, R11, R12), one input terminal is connected to the other terminal of the capacitor, a reference voltage is supplied to the other input terminal from the first resistor group, and the comparator (CO
A transistor (TR5) having a collector terminal connected to the other terminal of the capacitor, a base terminal connected to the first resistor group, and supplying a charging current to the capacitor;
And a second resistor group (R) connected to the emitter terminal of the transistor, comprising a plurality of resistors connected in series to each other.
8, R9), a second switch means connected to the second resistor group and the sensor and short-circuiting one of the resistors of the second resistor group by a running signal generated by the stop detecting means. (TR4)
And an intermittent wiper control device comprising: