JPS6348738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention drives a windshield wiper of an automobile.
More specifically, the present invention relates to a wiper drive device for switching the wiper operating mode depending on the number of times and time of selective operation of two switches.

The purpose of the present invention is to control the
To provide a wiper driving device which sequentially switches the wiper from an off state to an operating mode from low speed to high speed or vice versa, and further switches from each operating mode to intermittent operation depending on the length of operation time of the switch. be.

Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 1 is a motor for driving a wiper of an automobile, and its operation section is such that when the UP side is pressed, an output signal of its terminal 2a is output. Binary logic level H
(hereinafter simply referred to as H. Also, the binary logic level L is simply referred to as L), and when the DN side is pressed, the output of the terminal 2b becomes H at the same time (momentary) (when the hand is released, it returns to the neutral position) switch 2
It consists of 3 is a monostable circuit, which changes the output signal to H for about 0.5 seconds after the input signal goes to H. 4 is a differentiating circuit which outputs an H pulse when the input signal rises from L to H. 5 is an up-down type counter,
When the CL input signal becomes H, the OFF output becomes H, and the Lo and Hi outputs become L. In this state, when one H pulse enters the UP input, only the Lo output signal becomes H; when another H pulse enters, only the Hi output signal becomes H; then, the DN input becomes By inputting H pulses, only the Lo output signal becomes H,
Furthermore, when one H pulse is input to the DN input,
Only the OFF output signal becomes H. 6 is an RS-type flip-flop (hereinafter simply referred to as RS-FF);
7 is an oscillation circuit that oscillates a pulse with a cycle of 1 to 2 seconds and a duty of about 20%, 8 to 11 are AND gates, 12 to 14 are OR gates, 15 to 17 are inverters, 18 to 20 are drivers, and 21 is an intermittent circuit. This is an operation indicator lamp. 22 and 23 are relay coils, and when energized, contacts 22a and 2
Switch 3a to the dashed line side. 24 is a contact that switches in conjunction with the rotation of the motor 1.

In the circuit shown in Fig. 1, when the counter 5 is cleared and only the OFF output signal is H, both the relay coils 22 and 23 are de-energized, and the contacts 22a, 23a, and 24 are all closed. The state has been switched to the state shown in the figure, and the motor 1 is stopped.

Therefore, when switch 2 is pushed to the UP side, terminal 2
The signal a becomes H, enters the AND gate 8 and the OR gate 12, and the H signal that passes through the OR gate 12 activates the monostable circuit 3 to raise its output signal from L to H. , is differentiated by the differentiating circuit 4, becomes an H pulse, enters the R input of the RS-FF6, and resets the RS-FF6. Also, at this time, the AND gate 8 outputs the high level of the counter 5.
The output signal is L, which is inverted and added by the inverter 17, so it is open, so the H signal from the switch 2 passes through the AND gate 8 and enters the UP input of the counter 5. .

Therefore, counter 5 counts up and Lo
Only the output signal becomes H, and the relay coil 22 is energized via the OR gate 14 and the driver 18. For this reason, the contact 22a switches to the dashed line side, current flows to the Lo side brush of the motor 1, and the motor 1 rotates at a low speed. Therefore, the wiper performs a continuous operation at a low speed. In addition, since the contact 24 is linked and switched to the dashed line side immediately after rotation, even if the contact 22
Even if a returns, the contact 24 continues to rotate until it returns.

As above, push switch 2 to the UP side and
If you release your hand within 0.5 seconds, the motor 1 will continue to rotate at a low speed, but if you continue to press it for longer than that time, the output signal of the monostable circuit 3 will be restored to L, and the output signal of the inverter 15 will be Since it returns to H,
AND gate 10 opens, and the H signal from AND gate 8 connects to AND gate 10 and OR gate 1.
3, enters the S input of RS-FF6, and its RS
- Set FF6. Therefore, the Q output signal becomes H and enters the CL input of the counter 5, clearing the counter 5, and switching so that only the OFF output signal becomes H. Therefore, the relay coil 22 is de-energized, and the contact 22a returns to the solid line side.

On the other hand, the H signal of the Q output of the set RS-FF6 enters the oscillation circuit 7 and activates the oscillation circuit 7, so that the signal of the output of the oscillation circuit 7 changes from 1 to
It rises to H every 2 seconds and is applied to the relay coil 22 via the OR gate 14 and driver 18.
As a result, the motor 1 rotates, stops, and then rotates again intermittently, and the wiper operates intermittently. At this time, the lamp 21 continues to be lit, so that even if the wiper is at rest, it can be known that it is in intermittent operation.

In other words, as above, switch 2 is UPed once.
If you press the wiper toward the side for less than 0.5 seconds, the wiper will operate continuously at low speed, and if you press it for more than that time, the wiper will operate continuously at low speed.
Performs recessive operation at low speed.

Next, during the above-mentioned low-speed continuous operation, switch 2 is turned on again.
When pressed to the UP side, the UP input signal of the counter 5 becomes H, up-counting occurs, and only the Hi output signal becomes H, which causes the relay coils 22 and 2 to
3 is energized, its contacts 22a and 23a switch to the dashed line side, and current flows to the Hi brush of motor 1.
The motor 1 rotates at high speed. Therefore, the wiper performs a high-speed continuous operation. In addition, at this time, switch 2
Even if you keep pressing the UP side continuously for more than 0.5 seconds, the high output of counter 5 will go high at the same time as switch 2 is operated.
As a result, the output of inverter 17 becomes L and goes up.
The input is not outputted by the AND gate 8.

Therefore, the signal is not input to the S input of the RS-FF6 by the AND gate 10, and no intermittent operation is performed. next,
Switch 2 is UP again during the above high-speed continuous operation.
When pushed to the side, the Hi output signal of the counter 5 becomes H, and this is turned to the L by the inverter 17.
Since the signal is inverted and added to the AND gate 8, the AND gate 8 is closed, so that it does not affect the operation of the circuit.

Next, when the switch 2 is pushed to the UP side during the intermittent operation, an H signal is input to the R input of the RS-FF6 via the OR gate 12 and the differential circuit 4, and the RS-FF6 is reset. Since the Q output signal becomes L, the intermittent operation stops. Since the AND gate 8 is open at this time, the UP input signal of the counter 5 becomes H, the LO output signal becomes H, and low-speed continuous operation is performed.

In this case, if switch 2 is kept pressed to the UP side for more than 0.5 seconds, the intermittent operation will be restarted.

Next, when the switch 2 is pushed to the DN side during the intermittent operation, the RS-FF 6 is reset in the same manner as above, and the intermittent operation is ended. In this case also 0.5
If you keep pressing it for more than a second, the intermittent operation will resume. Next, if the switch 2 is pushed to the DN side during the above-mentioned high-speed continuous operation, the OFF output signal of the counter 5 is L, so it is passed through the inverter 16 to the AND gate 9.
Since the counter 5 is open, the DN input signal of the counter 5 becomes H and is counted down, so that only the Lo output signal becomes H, changing to a low-speed continuous operation. If switch 2 is pushed to the DN side and held down for more than 0.5 seconds, the operation changes to intermittent operation as described above.

Next, during the continuous low-speed operation described above, switch 2 is turned on.
If you push it to the DN side, the counter 5 will count down further, and the Lo output signal of the counter 5 will become L, and the OFF output signal will become H, thus ending the low-speed continuous operation.
If you keep pressing it for more than 0.5 seconds, it will change to intermittent operation as above.

FIG. 2 diagrammatically summarizes the operational aspects of the above operations. UP and DN indicate the operating direction of switch 2, thick arrows indicate when the switch is pressed for more than 0.5 seconds, and thin arrows indicate when the switch is pressed for less than 0.5 seconds.

FIG. 3 is a diagram showing a modified example of the circuit in FIG. 1, and since the stages subsequent to the relays 22 and 23 in FIG. 1 are the same, they are omitted. In the up-down type counter 25, when the count content is 0, the "0" output is H, when it is 1, the "1" output is H, when it is 2, the "2" output is H, and when the count is -1, the "-1" output is H. It becomes a signal.
3 is a monostable circuit similar to the monostable circuit 3 described above;
6 to 29 are AND gates, 30 to 33 are inverters, and 40 and 41 are OR gates.

In the circuit shown in FIG. 3, if the "0" output signal of the counter 25 is H, if the switch 2 is pushed to the UP side for less than 0.5 seconds, the AND gate 26 is open. As a result, the monostable circuit 3' operates, and the relay 22 is energized for 0.5 seconds due to its operation, resulting in one low-speed operation (MIST).
only. If you keep pressing the button for more than 0.5 seconds, the operation of the monostable circuit 3' will be restored and the output signal will go low.
Then, it is inverted by the inverter 30, enters the AND gate 28, and opens the AND gate 28, so
The H signal at terminal 2a of switch 2 is sent to counter 2 via AND gates 26, 28 and OR gate 40.
Therefore, the counter 25 counts up, and the "1" output signal changes to H, and the others change to L. Therefore, the relay 22 is energized and this state continues. Therefore, a slow continuous operation is performed.

Next, when the switch 2 is pushed to the UP side again, an H signal is applied to the UP input of the counter 25 via the AND gate 26, the AND gate 29 opened by the above operation, and the OR gate 40. Count up further and this time the counter is 25.
The signal of the "2" output becomes H, and the others become L.
As a result, relay coils 22 and 23 are energized, allowing high-speed continuous operation. It should be noted that the AND gate 26 is closed by the signal of this "2" output becoming H, and hence no signal from the UP side terminal 2a is accepted.

At this time, the AND gate 27 is open because the "-1" output signal of the counter 25 is L. Therefore, when the switch 2 is pushed to the DN side, the H signal at the terminal 2b passes through the AND gate 27 and is applied to the DN input of the counter 25, which causes a down count and the "1" output becomes H and the others become L. Become. Therefore, only the relay coil 22 is energized and continuous low-speed operation is performed.

If the switch 2 is pushed to the DN side again, the counter 25 will count down further, the "0" output of the counter 25 will change to H, the others to L, the relay coil 22 will also be de-energized, and the wiper operation will stop.

If you push switch 2 to the DN side again, counter 2
5 further counts down, and the output of "-1" becomes H, and the others become L. Therefore, the oscillation circuit 7 is activated, the relay coil 22 is repeatedly energized and de-energized, and the wiper operates intermittently at a low speed. Note that even if the switch 2 is pushed to the DN side again, the output signal of the inverter 32 becomes L due to the "-1" output of the counter 25 becoming H as described above, and the AND gate 27 is closed, so the circuit does not operate. There is no effect on

Next, when the switch 2 is pushed to the UP side, since the AND gate 29 is open at this time, the H signal of the UP side terminal 2a is transferred to the AND gates 26 and 2.
9. UP counter 25 via OR gate 40
As a result, the counter 25 counts up, the "-1" output changes to L, the "0" output changes to H, and the intermittent operation stops.

FIG. 4 shows the operation of the above operation in a manner similar to that shown in FIG. In this case, the wiper's one-time movement (MIST) is increased compared to FIG.

In the above description, one momentary switch 2 was used that can be operated in two directions from the neutral position and has two output terminals 2a and 2b.
2 momentary switches with 2 output terminals
It can also be used individually as an operating section. Further, although a circuit using a counter or a logic element has been used above, it is of course possible to use a microcomputer instead.

As described above, according to the present invention, the wiper operation mode can be sequentially switched from the off state to the low speed or high speed state depending on the number of operations and the length of the operation time, and each operation mode can be switched in addition to the above operation mode. It is also possible to switch to an intermittent operation mode, and since only two switches and a simple circuit are required, it can be manufactured at low cost and the number of lead wires can be reduced.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is an explanatory diagram of the operation and operation in the circuit of Figure 1,
FIG. 3 is a circuit diagram for a control method of another embodiment;
FIG. 4 is an explanatory diagram of the operation and operation in the circuit of FIG. 3, and FIG. 5 is an explanatory diagram of the operation and operation of another embodiment. 1... Wiper motor, 2... Momentary type switch, 3... Monostable circuit, 4... Differential circuit, 5... Up-down type counter, 6...
...RS-FF, 7...Oscillation circuit, 18-20...Driver, 25...Up-down type counter.

Claims (1)

[Claims] 1. The first and second switches are turned on only when the switch is operated, and the wiper motor changes from off to low speed and from low to high speed depending on the number of times the first switch is operated within a certain period of time. means for switching the wiper motor to an intermittent mode when the first switch is operated for more than the predetermined time in each of the operation modes; from high speed to low speed,
means for switching the operating mode from low speed to off;
In each of the high-speed and low-speed operation modes, the second
A wiper drive device comprising means for switching each wiper motor to an intermittent mode when the switch is operated for more than the predetermined period of time.