JPH0725312A - Wiper control device - Google Patents

Abstract

PURPOSE:To provide a wiper control device not stopped in an automatic stop position during the high speed rotation of a wiper motor regarding a viper control device used for an automobile. CONSTITUTION:A wiper control device is provided with a third control circuit 52, and it is so constituted that the automatic stop circuit of a viper motor 19 becomes a closed circuit during the high speed rotation of the wiper motor 19. As a result, the wiper motor 19 is smoothly rotated during high speed rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper control device mainly used in automobiles.

[0002]

2. Description of the Related Art A conventional automobile wiper control device will be described with reference to FIGS. FIG. 9 is a circuit diagram of a wiper motor drive unit which is a main part of the apparatus, and FIG. 10 is a circuit diagram of an operation unit which is a main part.

First, the wiper motor drive section will be described with reference to FIG. 9. Reference numeral 83 is a battery, which is connected to the first motor drive circuit 101 and the second motor drive circuit 110 via an ignition switch 81.

The first motor drive circuit 101 includes a relay 1
02, the transistor 106, the resistor 104, and the resistor 105
And is connected to the low speed operation terminal of the wiper motor 118d. In addition, the second motor drive circuit 110 includes a relay 112, a transistor 113, a resistor 114, and a resistor 1.
15 and is connected to the high speed operation terminal of the wiper motor 118d.

The first motor drive circuit section 101 and the second motor drive circuit section 110 are respectively provided in the operation section 12.
0 output terminals OUT1 and OUT2 are connected, and the first motor drive circuit section 101 is generated by an ON signal from any one of the output terminals OUT1 and OUT2 of the operation section 120.
Alternatively, either of the second motor drive circuit units 110 is driven.

Next, the operation of the wiper motor drive section will be described. When an intermittent on / off signal is output from the output terminal OUT1 as a signal in the INT mode to the first drive circuit section 101, a current i ₁ Flows through the resistor 104, the transistor 106 is turned on, the coil of the relay 102 is energized, and the relay contact 102c becomes the fixed contact 102a.
From the fixed contact 102b to the wiper motor 118d
A current flows through the wiper motor 118d and starts operating at a low speed.

When the wiper motor 118d starts to rotate,
The movable contact 118c of the auto stop circuit of the wiper motor 118d is connected to the fixed contacts 118a to 118b, and the output signal from the output terminal OUT1 is turned off.
Even when the relay 102 is turned off and the relay contact 102c returns from the fixed contact 102b to the fixed contact 102a, the wiper motor 118d still has the fixed contact 118b of the auto stop circuit.
From the fixed contact 11 of the relay through the movable contact 118c.
2a, movable contact 112c and current flow, wiper motor 1
18d continues to rotate at a low speed.

When the wiper motor 118d makes one rotation and reaches the auto stop position, the movable contact 118c of the auto stop circuit is switched to the fixed contact 118a, so that the wiper motor 118d is de-energized and the wiper motor 118d is removed.
Will stop. When the output of the output terminal OUT1 is turned on again after a few seconds of the intermittent rest time, the wiper motor 118d repeats the above operation.

When the ON signal is continuously output as the LO mode signal from the output terminal OUT1, the connection state between the relay contact 102c and the fixed contact 102b of the relay 102 is maintained and the wiper motor 118d continuously operates at a low speed. To do.

In the HI mode, the output terminal OUT2
The ON signal is continuously output from the wiper motor 118d to maintain the relay 112 in the ON state, whereby the wiper motor 118d continuously operates at high speed.

That is, the wiper motor drive section is connected to the output terminals OUT1 and OUT2 of the operation section, and the output terminal O
The first motor drive circuit 101 is driven by the INT mode or LO mode signal from the UT 1, and the output terminal O
The HI mode signal from the UT 2 drives the second motor drive circuit 102 to cause the wiper motor 118d to perform a predetermined operation.

Next, the operation section 120 having the output terminals OUT1 and OUT2 will be described with reference to FIGS. 10 (a) and 10 (b).
Will be described. As shown in the figure, 121 is a power supply circuit, which is connected to a battery 83 via an ignition switch 81 and a fuse 80 and supplies a voltage for driving an integrated circuit (hereinafter referred to as an IC) 122. , 123 are wiper switches composed of fixed contacts 125 and 126 and a movable contact 124 and having only an on / off function. Each time the wiper switch 123 is turned on, the output terminal 1 or the output terminal 2 is turned off → INT mode signal ( The above-mentioned signal of output terminal 1) → LO mode signal (output terminal 1) → HI mode signal (output terminal 2) → OFF is output to the wiper motor drive section.

[0013]

However, in the above-mentioned conventional wiper control device, since the automatic stop circuit of the wiper motor 118d operates when the wiper motor 118d rotates at high speed (HI), the wiper motor 11 does not operate.
When 8d comes to the auto stop position, the wiper motor 118d is once stopped and there is a problem that it does not operate smoothly.

An object of the present invention is to solve such a conventional problem and to provide an excellent wiper control device in which the wiper motor 118d does not stop at the auto-stop position even when the wiper motor rotates at a high speed.

[0015]

In order to solve the above-mentioned problems, the present invention provides a third control circuit so that the automatic stop circuit of the wiper motor is opened when the wiper motor rotates at a high speed.

[0016]

Therefore, according to the present invention, a control circuit interlocked with the high speed rotation signal of the wiper motor is provided in the auto stop circuit of the wiper motor, and when the high speed rotation is performed, the auto stop circuit is opened so that the wiper motor is at the auto stop position during the high speed rotation. The wiper motor rotates smoothly without stopping.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A wiper control circuit according to an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 is a battery, and 2 is a three-terminal regulator for making the voltage 12 (V) of the battery 1 a voltage at which the microcomputer 3 operates. The output terminal is a power supply terminal Vcc of the microcomputer 3.
It is connected to the.

Reference numeral 4 is a ceramic capacitor, 5 is an electrolytic capacitor, which is connected in parallel to the Vcc terminal of the microcomputer 3, absorbs noise and surge in the power supply line, and stabilizes the power supply voltage. Reference numeral 6 is an oscillator, and 7 is a ceramic capacitor, which is connected to an oscillation terminal of the microcomputer 3.

The electrolytic capacitor 8 is connected to the RESET terminal of the microcomputer 3.

Reference numerals 9 and 10 denote switches, and SW1 of the switch 9.
Switches the wiper function from OFF → INT → LO → HI and up direction, and SW2 of the switch 10 switches from HI →
The switching is performed in the down direction from LO → INT → OFF.

Resistors 11 and 12, ceramic capacitor 1
Reference numerals 3 and 14 are for preventing chattering of the switches 9 and 10 connected to the input terminals of the microcomputer 3. A wiper motor 19 has an auto stop switch 19a.

Reference numeral 50 is a first control circuit, which is configured to control the low speed rotation of the wiper motor 19 by the outputs of the output terminals P ₁ and P ₂ of the microcomputer 3.

Reference numeral 51 is a second control circuit, which is configured to control the high speed rotation of the wiper motor 19 by the output from the output terminal P ₃ of the microcomputer 3, and 52 is a third control circuit, which is a second control circuit. Similar to the control circuit 51, the output from the output terminal P _{3 is used} to open and close the loop circuit of the auto stop switch 19a of the wiper motor 19 and the LO terminal of the wiper motor 19.

The P ₁ output terminal of the microcomputer 3 is for the output signal of the intermittent wiper (INT), and the P ₂ output terminal outputs the low speed rotation (LO) signal of the wiper.
The output terminal of P ₃ is for the wiper high speed rotation (HI) output signal. Reference numerals 15 and 16 denote diodes which prevent the outputs from the terminals P ₁ and P ₂ of the microcomputer 3 from flowing back to the respective terminals.

Reference numerals 17 and 18 are diodes for branching the output of P ₃ of the microcomputer 3.

Reference numerals 20, 21, 22 are relays, and the common terminal 20a of the relay 20 is a LO of the wiper motor 19.
The break contact 20b is connected to the terminal and the relay 2
The second break contact 22b is connected to the make contact 20c.
Are configured to be connected to a power line.

The contacts 21a and 21b of the relay 21 are connected to the HI terminal of the wiper motor 19 and the power supply line, respectively. The common terminal 22a of the relay 22 is connected to the common terminal 19ac of the auto stop switch 19a of the wiper motor 19. Reference numerals 23, 24 and 25 are transistors, which are connected to control the relays 20, 21 and 22 respectively.
It is configured. 26, 27, 28 are diodes, which are connected to both ends of the coils of the relays 20, 21, 22 respectively,
It absorbs the back electromotive force generated in the coil.

Reference numerals 29, 30 and 31 are resistors for biasing the transistors 23, 24 and 25, respectively.
Reference numerals 3 and 34 are for limiting the base currents of the transistors 23, 24 and 25, respectively.

Next, the operation of the above embodiment will be described.
When turning on the switch 9 in the above embodiment the signal is applied to the input terminal DB ₀ of the microcomputer 3, the microcomputer 3 is activated, a square wave is output from the output terminal P ₁ with intervals as shown in FIG. 2, transistor A signal is applied to the base of 23, and the relay 20 operates intermittently by this output signal.

When the switch 9 (SW1) is turned on as shown in FIG. 2, the output of P ₁ of the microcomputer 3 becomes (H).
Then, the transistor 23 is turned on, the coil of the relay 20 is energized, the relay 20 is turned on, and the relay 2 is turned on as shown in FIG.
The common terminal 20a of 0 is from the normally closed contact 20b to the normally open contact 2
It will be switched to 0c. As a result, the LO terminal of the wiper motor 19 is energized, the current I ₁ flows, and the wiper motor 19 starts operating at a low speed.

When the wiper motor 19 starts to rotate, the common terminal 19ac of the auto stop switch 19a is 19a.
Switching from a to 19ab (FIG. 4). Eventually, when t ₁ (FIG. 2) elapses and the output of P ₁ becomes (L), the transistor 23 is turned off, the relay 20 is also turned off, and the contact of the relay 20 is switched from 20c to 20b. Is the contact 19a of the auto stop switch 19a
The current I ₂ continues to flow from b to 19ac and continues to rotate at a low speed (FIG. 5).

When the wiper motor 19 rotates and the contact point of the auto stop switch 19a is switched from 19ab to 19aa (FIG. 1), the current I ₂ disappears and the wiper motor 19 stops (t _{2 in} FIG. ₂ ). From t _{2 in} FIG. 2 to P ₁
The wiper motor 19 is stopped only for the time t ₃ until the output of (1) becomes (H). By repeating this, the wiper operates intermittently.

Next, the switch 9 (SW1) is turned on again.
Then P of the microcomputer 3 ₁Output of (L)
Nari P₂Output terminal becomes (H). P₂Terminal is (H)
Then, the transistor 23 and the relay 20 turn on, and the wiper
The motor 19 is energized and rotates at a low speed.

When the switch 9 (SW1) is further turned on,
The output of P ₂ of the microcomputer 3 becomes (L) and P
₃ terminal output becomes (H). When P ₃ becomes (H), the transistors 24 and 25 are turned on almost at the same time, and the relays 21 and 22 are turned on at the same time. When the relay 21 is turned on, the relay contact 21b is connected to 21a, a current I ₃ flows through the HI terminal of the wiper motor 19, and the wiper motor 19 starts rotating at high speed. When the relay 22 is turned on at the same time,
The relay contact 22a is switched from 22b to 22c, and the auto stop switch 19a of the wiper motor 19 and the relay 2
0 through the contacts 22b to 22a and the wiper motor 19
The closed circuit consisting of the LO terminal of
The current flowing from the HI terminal to the LO terminal of the wiper motor 19 disappears, and the wiper motor 19 normally rotates at high speed (FIG. 6).

As described above, according to the above-described embodiment, the auto stop switch 19a of the wiper motor 19 is inserted into the relay 22 so as to form an open circuit when the wiper motor rotates at high speed, and the relay 22 is synchronized when the wiper motor 19 rotates at high speed. The current I ₄ does not flow to GND from the HI terminal of the wiper motor 19 through the LO terminal as shown in FIG. 7, and the wiper motor 19 rotates normally at high speed. It has an effect.

FIG. 8 shows the essential parts of a wiper control device according to another embodiment of the present invention. The difference from the embodiment of FIG. 1 including the parts not shown is the HI of the wiper motor 19.
The electrolytic capacitor 35 is connected between the base and the emitter of the transistor 24 that controls the relay 21 connected to the terminal side.

According to the above embodiment, the switch 9 (SW
1) or when the switch 10 (SW2) is turned on and an output signal is output from P _{3 of the} microcomputer 3, signals are simultaneously applied to the transistor 24 and the transistor 25, but the capacitor 35 is placed between the base and emitter of the transistor 24. Connected to the transistor 24
The ON time is delayed from the transistor 25 by the time constant of C / R, the relay 22 is turned on before the relay 21 and the relay contact 22a is switched to 22c, and then the contact 21b of the relay 21 is switched to 21a. After being connected and the auto stop circuit of the wiper motor 19 is opened, the HI terminal of the wiper motor 19 is energized, the wiper motor 19 rotates smoothly at high speed, and the operating time of the two relays 21 and 22 is increased. Even if there are variations, the motor auto-stop circuit will surely be the open circuit first.

[0039]

As is apparent from the above-described embodiment, the present invention is provided with the third control circuit so as to shut off the wiper auto-stop circuit in conjunction with the HI signal when the wiper switch is in the HI position. When the wiper motor rotates at high speed (HI), the short circuit at the auto stop position of the wiper motor disappears, the wiper motor starts rotating at high speed smoothly, and the wiper motor stops at the auto stop position when rotating at high speed. Have advantages.

Furthermore, when a delay circuit is provided in the third control circuit for starting the high speed rotation of the wiper motor, even if there are variations in the operating time of the high speed rotation control relay and the automatic stop opening circuit relay, it is possible to ensure that Before the high speed rotation of the wiper motor, the auto stop circuit of the wiper motor can be opened.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of a wiper control device of the present invention.

FIG. 2 is a timing chart diagram of the same.

FIG. 3 is a circuit diagram of a main part of a drive unit for explaining the same operation.

FIG. 4 is a circuit diagram of a main part of a drive unit for explaining the same operation.

FIG. 5 is a circuit diagram of a main part of a drive unit for explaining the same operation.

FIG. 6 is a circuit diagram of a main part of a drive unit for explaining the same operation.

FIG. 7 is a circuit diagram of a main part of a drive unit for explaining the same operation.

FIG. 8 is a circuit diagram of a main part of a drive unit according to another embodiment.

FIG. 9 is a circuit diagram of a conventional wiper control device.

FIG. 10 is a circuit diagram of an operation unit, which is the main part of the same.

[Explanation of symbols]

 3 Microcomputer 9 Switch (SW1) 10 Switch (SW2) 19 Wiper motor 19a Auto stop switch 50 First control circuit 51 Second control circuit 52 Third control circuit

Claims (2)

[Claims] 1. A wiper motor having an automatic stop mechanism, a switch for switching modes, means for converting the operation of the switch into an electric signal, the first control circuit and the second control circuit driven by the electric signal. And a third control circuit, the first control circuit is connected to the low speed rotation terminal of the wiper motor, the second control circuit is connected to the high speed rotation terminal of the wiper motor, the third control circuit is , A wiper control device connected to an auto stop circuit of a wiper motor. 2. The wiper control device according to claim 1, wherein the second control circuit is provided with a delay circuit, and the control is delayed more than that of the third control circuit.