JPH0716532Y2 - Wiper control device - Google Patents

Description

The present invention relates to a wiper control device, and more particularly to a wiper control device suitable for controlling the operation of a vehicle wiper together with the operation of a washer.

[Conventional technology]

BACKGROUND ART Vehicles such as automobiles are provided with a wiper device that wipes rain attached to a glass surface such as a windshield and a washer device that sprays a cleaning liquid onto the glass surface. In those equipped with these devices, when the washer switch is operated, the cleaning liquid can be jetted onto the glass surface and the wiper can be operated. That is, both the washer motor and the wiper motor can be driven in response to the operation of the washer switch.

[Problems to be solved by the invention]

However, in the conventional wiper control device, electric power is constantly supplied from the power supply to the circuit element groups of the wiper motor drive system and the washer motor drive system, and each drive system is operated by the operation of the wiper switch or the washer switch. Circuit was working. For this reason, even when both the wiper switch and the washer switch are off, if noise from outside or inside the vehicle due to wireless noise or electric noise enters, each drive system malfunctions because the circuit elements of each drive system are in the activated state. I was afraid.

The present invention has been made in view of the above-described conventional problems, and an object thereof is that when the wiper switch and the washer switch are both off, noise causes the circuit elements of the wiper motor drive system and the washer motor drive system to malfunction. It is an object of the present invention to provide a wiper control device that can prevent the occurrence of the above.

[Means for solving problems]

In order to achieve the above object, the present invention provides a power supply circuit for supplying power from a power source to a load in response to the operation of one of a wiper switch and a washer switch, and the operation of the wiper switch. A wiper motor control circuit that intermittently drives a wiper motor by operating a wiper switch, with a first circuit element group that responds to receive power from the power supply circuit as one of the loads and starts the main circuit element, The wiper motor and the washer motor are driven by the operation of the washer switch, with the second circuit element group that receives the power from the power supply circuit as one of the loads and is activated in response to the operation of the washer switch, as the main constituent element. And a washer interlocking wiper motor control circuit.

[Action]

When either one of the wiper switch and the washer switch is operated, power is supplied from the power supply circuit to the wiper motor control circuit and the washer interlocking wiper motor control circuit in response to the operation of this switch. The wiper motor is intermittently driven by operating the wiper switch, and the wiper motor and washer are driven by operating the washer switch.

[Example of device]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a preferred embodiment of the present invention. In FIG. 1, a power supply circuit 100 includes a wiper switch 1, a transistor 2, resistors 3,4,5,6,7, a capacitor 8, a Zener diode 9, inverters 10,11, diodes 12,13, a flip-flop 14, a washer. Switch 1
5 is included, and one end of the washer switch 15 is connected to the battery B via the washer motor M1. Resistance 3,
Zener diode 9 and capacitor 8 function as a power supply stabilization circuit, and when wiper switch 1 is operated,
Electric power from the battery B is supplied from the terminal 16 to each circuit element of the wiper motor control circuit 200 and the washer interlocking wiper motor control circuit 300. At this time, the terminal 17 is at the high level and the output of the inverter 11 is at the low level, so the flip-flop 14 is not set and the output terminal Q is maintained at the low level.
Therefore, the output of the inverter 10 is maintained at high level,
The transistor 2 is never turned on.

On the other hand, when the washer switch 15 is operated, the drive loop of the washer motor M1 is formed and the bias circuit of the transistor 2 is formed. That is, when the washer switch 15 is operated, the resistor 5 and the diode 1
2, the base current flows through the washer switch 15,
Transistor 2 turns on. As a result, the electric power from the battery B is output from the terminal 16 to the wiper motor control circuit 200 and the washer interlocking wiper motor control circuit 300 via the transistor 2 and the resistor 3. At this time, since the terminal 17 is grounded via the diode 13, the terminal 17 becomes low level, and the output of the inverter 11 is inverted to high level. As a result, the flip-flop 14 is set and a high level signal is output from the output terminal Q. This signal is output to the washer interlocking wiper motor control circuit 300 and also to the inverter 10. The output of the inverter 10 is inverted to the low level, and the on state of the transistor 2 is maintained. That is, when the washer switch 15 is operated and the flip-flop 14 is set, the resistors 4, 6 and the inverter 1
A bias circuit is formed via 0. Therefore, even if the washer switch 15 is turned off, the flip-flop 14
In the set state, the transistor 2 is maintained in the on state and the terminal 16 is supplied with the electric power from the battery B.

The wiper motor control circuit 200 includes a motor switch 20 and a relay 2
1, oscillator 22, frequency divider 23, vehicle speed sensor 24, one-shot timer 25, 26, 27, inverter 28, AND gate 29, 30, 31, OR
The gate, 32, 33, 34, 35, flip-flops 36, 37, counter 38, resistor 39, transistor 40, relay coil 21L are included, and each circuit element group is supplied with power from the terminal 16. There is. The contact 20E of the motor switch 20 and the relay contact 21C are connected to the wiper motor M ₂ .

The wiper motor M ₂ is connected to the wiper blade, and the wiper motor M ₂ is rotated once to wipe the wiper blade in one wiper operation cycle. Then, the contact of the motor switch 20 opens and closes in synchronization with the rotation of the wiper motor M ₂ , and the motor switch 20
The start and end of each wiper operation cycle can be detected by opening and closing the contact point. That is, the contact 20C of the motor switch 20 is normally grounded via the contact 20E, and when the wiper motor M ₂ rotates, the contact 20C switches from the contact 20E side to the contact 20B side at the same time as this rotation, and the wiper motor M ₂ moves. After one rotation, contact 20C contacts from contact 20B side
It is configured to switch to the 20E side.

The power from the terminal 16 is supplied to the one-shot timer 26, and when the power from the terminal 16 is supplied to the one-shot timer 26, the high-level signal is ORed for a certain time from the one-shot timer 26. Output to the gate 33. OR
When a high level signal is input to the gate 33, the OR gate 33
Outputs a high level signal from the flip-flop 36
Is set, and a high level signal is supplied from the output terminal Q of the flip-flop 36 to the transistor 40 via the OR gate 35 and the resistor 39. As a result, the transistor 40 is turned on and the relay coil 21L is excited. And relay 2
The contact 21C of 1 switches from the contact 21a side to the contact 21b side, and the drive of the wiper motor M ₂ is started.

The output signal of the oscillator 22 that generates the reference pulse signal of a constant cycle is supplied to one input terminal of the AND gate 30 and is also supplied to the input terminal of the AND gate 29 via the frequency divider 23. On the other hand, the other input terminal of the AND gate 30 is supplied with the signal from the vehicle speed sensor 24 through the one-shot timer 25, and the other input terminal of the AND gate 29 is provided with the output signal from the one-shot timer 25. Supplied via 28. Then, the output signal of the oscillator 22 is output only when the output level of the one-shot timer 25 becomes high level for a certain period of time due to the output pulse of the vehicle speed sensor 24.
It is output via the AND gate 30 and the OR gate 32. When the output level of the one-shot timer 25 becomes low level and the output level of the inverter 28 is inverted to high level, the output signal of the frequency divider 23 is AND gate 29, OR gate 32.
It is designed to be output via. The output signal of the OR gate 32 is supplied to the input terminal of the counter 38 via the AND gate 31.

The other input terminal of the AND gate 31 is a flip-flop 37,
Contact of motor switch 20 via one-shot timer 27
It is connected to 20C. And contact 2 of the motor switch 20
When 0C switches from the contact 20B side to the contact 20E side, the one-shot timer 27 outputs a high-level signal for a certain period of time, this signal is output to the flip-flop 37, and when the flip-flop 37 is set, the flip-flop 37 is set. The high-level signal from the output terminal Q of the
It is designed to be input to. Therefore, the counter 38
Is the motor switch at the end of the wiper operating cycle
Based on the output pulse from the one-shot timer 27 in response to the operation of 20, the count state is enabled and the output pulse from the OR gate 32 is counted. When this count value reaches the set value, a high-level signal is output from the output terminal of the counter 38, and when this signal is output to the flip-flop 36 via the OR gate 33, the flip-flop 36 enters the set state and the transistor 40 turns on. That is, the counter 38 is configured to output a high level signal from the output terminal to form a drive loop of the wiper motor M ₂ when the set value set as the intermittent pause time and the count value match. When the flip-flop 36 is in the set state, the signal from the output terminal Q is supplied to the clear terminal of the counter 38 via the OR gate 34, the count value of the counter 38 is cleared, and the flip-flop 37 is reset. It

When the wiper motor control circuit 200 configured as described above is supplied with electric power associated with the operation of the wiper switch 1, a high-level signal is output from the one-shot timer 26 for a certain period of time, and the flip-flop 36 is set to the set state.
The transistor 40 is turned on, the contact 21C of the relay 21 is switched from the contact 21a side to the contact 21b side, and the drive loop of the wiper motor M ₂ is formed. As a result, the wiper motor M ₂ starts rotating and the contact 20C of the motor switch 20 switches from the contact 20E side to the contact 20B side. At this time, the counter 38 is in a state where its count value is cleared by the output pulse of the flip-flop 36. Also, the output level of the one-shot timer 26 is inverted to the low level, and the flip-flop 36 is reset to turn on the transistor.
40 turns off, relay 21 contact 21C to contact 21B
Even Hen' cut to 21A side, the contacts 20B, 20 in the wiper motor M ₂
Since the electric power of the battery B is supplied via C and the relay contacts 21A and 21C, the wiper motor M ₂ continues to rotate.

When the wiper motor M ₂ makes one rotation and one wiper operation cycle ends, the contact point 20C of the wiper switch 20 switches from the contact point 20B side to the contact point 20E side, and a braking loop of the wiper motor M ₂ is formed. At this time, each input terminal of the OR gate 34 becomes low level, so that the clearing of the counter 38 is released. Further, the one-shot timer 27 outputs a high level signal at the falling pulse when the motor switch 20 is switched, and the flip-flop 37 is set. This enables the counter 38 to count, and the oscillator 22
The counting of output pulses from is started. When the output level of the one-shot timer 25 is inverted from the high level to the low level, the output pulse from the frequency divider 23 is input to the counter 38 and the counting according to this pulse is started.
This output pulse counting is continued until the next pulse is generated from the vehicle speed sensor 24. When the count value of the counter 38 reaches the set value, a high level signal is output from the output terminal of the counter 38 to the OR gate 33, and the flip-flop
With 36 set again, the drive loop for motor M ₂ is formed. Therefore, the intermittent pause time of the wiper is determined by the count time of the counter 38, and
Since the interval of the input pulse of 38 changes according to the generation interval of the output pulse of the vehicle speed sensor 24, the intermittent rest time can be changed according to the vehicle speed.

The washer interlocking wiper motor control circuit 300 is an inverter 5
0, 51, AND gates 52, 53, 54, 55, 56, OR gates 57, 58, counter 59, NOR gate 60, flip-flop 61, and each circuit element group is supplied with power from the terminal 16. It has become so. The input terminal of the AND gate 52 is the output terminal Q of the flip-flop 14, the input terminal of the AND gate 53 is the output terminal of the oscillator 22, and the input terminal of the AND gate 54 is the frequency divider 2
The input terminal of the inverter 50 is connected to the washer switch 15, the output terminal of the AND gate 56 is connected to the reset terminal R of the flip-flop 14, and the output terminal Q of the flip-flop 61 is connected to the OR gate 35. .

When the wiper switch 1 is operated, the washer interlocking wiper motor control circuit 300 supplies power from the terminal 16 to each circuit element group, but the output terminal Q of the flip-flop 14 is at the low level and the AND gate 53, Since the output level of 54 is maintained at the low level, the counting by the counter 59 remains stopped. When power is supplied to the terminal 16, the input terminal of the OR gate 58 becomes high level, and the output signal of the OR gate 58 clears the count value of the counter 59.

When the washer switch 15 is operated while the wiper switch 1 is off, the drive loop of the washer motor M ₁ is formed and the terminal 16 is supplied with electric power from the battery B. At this time, the flip-flop 14 is set, and a high level signal is output from the output terminal Q. Further, since the input side of the inverter 50 is inverted to the low level, each input terminal of the AND gate 52 becomes the high level. Therefore, the output level of the AND gate 52 is inverted to the high level, and the output pulse from the oscillator 22 is input to the counter 59 via the AND gate 53 and the OR gate 57. When the count value of the counter 59 reaches the set value, the counter 59
A high level signal is output from the output terminal of the AND gate 55 to the AND gate 55, and the flip-flop 61 is set. When the flip-flop 61 is set, a high level signal is output from the output terminal Q, the transistor 40 is turned on, and a drive loop for the wiper motor M ₂ is formed. The time from when the washer switch 15 is operated to when the wiper motor M ₂ is driven is set as the washer delay time. That is, this time is set as the set value of the counter 59. It should be noted that the counter 59 inverts the output level of the NOR gate 60 to a high level when the washer switch 15 is operated, and this signal is supplied through the OR gate 58, so that the count value is changed by operating the washer switch 15. Cleared.

Next, when the washer switch 15 is turned off, the input side of the inverter 50 is inverted to the high level and the output side is inverted to the low level, and the output level of the AND gate 52 is inverted to the low level. Therefore, the output pulse from the oscillator 22 is not input to the counter 59. On the other hand, since the output level of the inverter 51 is inverted from the low level to the high level, the output pulse from the frequency divider 23 is input to the counter 59 via the AND gate 54 and the OR gate 57. At this time, since both the flip-flops 61 and 14 are maintained in the set state, the transistor 2 is kept in the ON state, and the terminal 16 is provided to each rotary element group of the wiper motor control circuit 200 and the washer interlocking wiper motor control circuit 300. Power is being supplied via.

When the count value of counter 59 reaches the set value, counter 59
From the AND gate 56, a high level signal is input, the flip-flops 61 and 14 are both reset, the transistor 40 is turned off, and the drive loop of the wiper motor M ₂ is cut off. When the flip-flop 14 is reset, the output level of the inverter 10 is inverted from low level to high level, and the transistor 2 is turned off. As a result, the supply of electric power to each circuit element group of the wiper motor control circuit 200 and the washer interlocking wiper motor control circuit 300 is stopped.

[Effect of device]

As described above, according to the present invention, the electric power from the battery is supplied to each circuit element group of the wiper motor control circuit and the washer interlocking wiper motor control circuit only when one of the wiper switch and the washer switch is activated. Therefore, even if noise is input to the wiper motor control circuit or the washer interlocking wiper motor control circuit when the wiper switch and the washer switch are both off, the wiper motor and washer motor drive system can be prevented from malfunctioning. The excellent effect that it can contribute to the improvement of reliability is obtained.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing one embodiment of the present invention. M ₁ …… washer motor, M ₂ …… wiper motor, 1 ……
Wiper switch, 14,36,37,61 …… Flip-flop, 1
5: Washer switch, 20: Motor switch, 38,
59: Counter, 100: Power supply circuit, 200: Wiper motor control circuit, 300: Washer interlocking wiper motor control circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Koji Takizawa, Noda, Oguchi-cho, Oguchi-machi, Niwa-gun, Aichi No. 1 Noda, Tokai Rika Electric Co., Ltd. (72) Noriyuki Suzuki, Oguchi-machi, Niwa-gun, Aichi Noda No. 1 Tokai Rika Electric Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] 1. A power supply circuit that supplies power from a power source to a load in response to the operation of one of a wiper switch and a washer switch, and the power supply circuit in response to the operation of the wiper switch. First, which receives power from the vehicle as one of the loads and starts up
Of the circuit element group as a main constituent element, the wiper motor control circuit for intermittently driving the wiper motor by the operation of the wiper switch, and the power from the power supply circuit as one of the loads in response to the operation of the washer switch. A wiper control device comprising: a second circuit element group which is activated upon receipt of the wiper motor as a main constituent element; and a wiper motor and a washer interlocking wiper motor control circuit which drives the washer motor.