JPS628210Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a washer-linked wiper used in an automobile.

If your car's windshield is dirty,
Conventionally, a washer was operated simultaneously with the wiper operation to spray liquid onto the glass surface. In this case, since the wiper operation is performed at the same time or in advance of the washer operation, the wiper plate moves over the dirty glass surface in a dry state, thereby causing scratches on the glass surface. Furthermore, if the wiper operation was also stopped at the same time as the washer operation was stopped, water adhering to the upper part of the glass surface would flow down, making it difficult to see the front view.

In order to solve these problems, a control device has been proposed which operates the wiper after a certain period of time after the washer is activated, and which stops the wiper after a certain period of time after the washer stops.

However, such conventional control devices
Because they are made with discrete components, the circuits are complex and large, requiring more man-hours to assemble the wiring, and consumes more power. In addition, a time constant using a capacitor and a resistor is used to obtain the delay time, but
In general, capacitors have poor temperature and voltage characteristics, resulting in large variations in time accuracy and unstable performance.

The present invention was developed to eliminate these conventional drawbacks, and its purpose is to achieve high time accuracy and stability, and to enable smaller size, lower price, and lower power consumption. An object of the present invention is to provide a washer-linked wiper control device.

In order to achieve this purpose, the present invention
When the watch switch is turned on, the first frequency divider circuit to which the time reference signal is input starts to operate, and the first output signal starts driving the wiper motor, and when the watch switch is turned off, the output of the first frequency divider circuit is started. The operation of the second frequency dividing circuit to which the signal is input is started, and the drive of the wiper motor is stopped by the first output signal.

Hereinafter, the present invention will be explained in detail based on the drawings.

Fig. 1 is a block circuit diagram of one embodiment of the washer-linked wiper control device according to the present invention, Fig. 2 is a time chart showing the level at each point in Fig. 1 during the washer operation, and Fig. 3 is also an intermittent wiper control device. This is a time chart showing the level during wiper operation. In Figure 1, 1 is a clock circuit that has a crystal oscillator 2 and generates a highly accurate time reference signal with a constant frequency of 50 Hz.3 inputs this time reference signal and outputs it from the _Q6 output terminal at a duty ratio of 50%. The first frequency divider circuit outputs a signal with a period of 1.28 seconds and a period of 2.56 seconds from the Q ₇ output terminal, and a signal with a period of 5.12 seconds from the Q ₈ output terminal. 4 is a signal from the Q ₆ output terminal of frequency divider circuit 3. A second frequency divider circuit inputs and divides this into 1/5,
5 is a D-type flip-flop circuit, 6 is an amplifier, 7
8 is a wiper motor, and 8 is a washer motor.
Note that the wiper motor 7 includes a well-known self-holding mechanism having a cam provided for determining the stopping position of the blade. In addition, SW ₁ is a wiper switch with fixed contacts in three positions: OFF, intermittent (INT), and continuous (CONT), SW ₂ is a non-lock type watch switch, G ₁ and G ₂ are NOR circuits, and G ₃ , _G7 , and _G8 are OR circuits, _G4 , _G5 , and _G6 are AND circuits, and _INV1 , _INV2 , and _INV3 are inverters.

Next, in Figure 2, A is the watch switch.
The operating state of SW ₂ , (b) the level waveform of the D terminal of the flip-flop circuit 5, (c) the CL terminal, and (d) the level waveform of the Q output terminal, respectively. In Fig. 3, A indicates the operating state of the intermittent contact of wiper switch _SW1 , B indicates the _Q7 output terminal of the frequency divider circuit 3, and C indicates the _Q8 output terminal.
Output terminal d shows the level waveform of the t output terminal of the OR circuit _G8 .

In such a configuration, the operation will be explained next.

First, when the accessory (ACC) circuit is turned on by operating the engine key selector switch, current flows for a short time in the series circuit of capacitor C and resistor R, and a voltage is instantaneously generated across resistor R. As a result, the r output terminal of inverter INV ₁ becomes “0”
and the s output terminal of inverter INV ₂ is “1”
Therefore, the flip-flop circuit 5 is automatically reset. Note that this reset is canceled in a short time. Next, wiper switch SW ₁ is turned OFF.
With the watch set in the
When SW ₂ is operated to turn on, the battery voltage V _DD is applied to the washer motor 8, which rotates and sprays the washer fluid onto the windshield. In addition, when the watch switch SW ₂ is turned on, the b input terminal of the NOR circuit G ₁ becomes "1" at the same time, so that the R terminal for resetting the frequency divider circuit 3 becomes "0" and is reset. It is released and frequency division operation starts. In addition, the frequency divider circuit 4 is reset with the R terminal set to "1", and the D terminal of the flip-flop circuit 5 and the AND circuit G ₆
The m input terminal of the AND circuit G5 becomes "1", and the k input terminal of the AND circuit _G5 is inverted by the inverter _INV3 and becomes "0". As a result, as mentioned above, 50Hz is output from the _Q6 output terminal due to the start of the operation of the frequency divider circuit 3.
A signal with a period of 1.28 seconds, which is divided by ^1/26 , is output. Since this signal has a duty ratio of 50%, the output of the _Q6 output terminal becomes "1" 0.64 seconds after the reset of the frequency divider circuit 3 is released. This “1” output is an AND circuit
It is applied to the l input terminal of _G6 , so that both inputs of AND circuit _G6 become "1" and its output becomes "1". This "1" output enters the o input terminal of the OR circuit _G7 , is output as it is, and enters the CL terminal of the flip-flop circuit 5. As a result, the flip-flop circuit 5 is set and the output of its Q output terminal becomes "1", and from then on, the frequency divider circuit 3 outputs "1".
Even if signals are output from the _Q6 output terminal in sequence, this state will not change while watcher switch SW ₂ is on. “1” output of Q output terminal is OR circuit
Enters the p input terminal of G ₈ , which causes OR circuit G ₈
The output of is "1". As a result, this output is amplified by the amplifier 6 and applied to the wiper motor 7, so that the wiper motor 7 starts to be driven. Here, when the washer switch SW ₂ is turned off, the washer motor 8 immediately stops, but the wiper motor 7 continues to be driven. That is, when the watch switch _SW2 is turned off, the R terminal of the frequency dividing circuit 4 becomes "0", so that the reset is released and the frequency dividing operation is started. At the same time, the b input terminal of the NOR circuit _G1 , the D terminal of the flip-flop circuit 5, and the m input terminal of the AND circuit _G6 become "0", and the k input terminal of the AND circuit _G5 becomes "1". . At this time, since both the D and CL terminals of the flip-flop circuit 5 become "0", the Q output terminal continues to be "1". For this reason,
The a input terminal of the NOR circuit _G1 becomes "1", and the frequency divider circuit 3 is released from reset, that is, is in the frequency dividing operation state. Therefore, the output signal from the _Q6 output terminal of the frequency divider circuit 3 is input to the frequency divider circuit 4, where it is divided into 1/5
A signal with a cycle of 6.4 seconds is output with a duty ratio of 50%. For this reason, the watch switch
After 3.2 seconds have passed after SW ₂ is turned off, the output of frequency divider circuit 4 becomes "1", and as a result, both inputs of AND circuit G ₅ become "1", and its output becomes "1". When the n input terminal of the OR circuit _G7 becomes "1", its output becomes "1" and is input to the CL terminal of the flip-flop circuit 5. Here, since the D terminal of the flip-flop circuit 5 is set to "0", the Q output terminal becomes "0", and as a result, the t output terminal of the OR circuit _G8 becomes "0" and the wiper motor 7 is driven. will be stopped. Thus, when the washer switch SW ₂ is turned on and the washer liquid is sprayed and the windshield surface is sufficiently wetted, that is, after 0.64 seconds in this embodiment, the wiper is activated, and the washer switch SW ₂ is turned off. The wiper drive is stopped when the liquid is sufficiently wiped off, that is, after 3.2 seconds in this embodiment.

Next, when the wiper switch SW ₁ is switched to the intermittent (INT) position, the c input terminal of the NOR circuit G ₁ becomes "1", so its output becomes "0", and the frequency divider circuit 3 is released from reset and the divider circuit 3 is reset. Circular motion is started. At the same time, the f input terminal of the OR circuit G ₃ becomes "1", so its output becomes "1", and as a result, the i input terminal of the AND circuit G ₄ becomes "1". As a result, as the frequency divider circuit 3 starts operating,
A signal with a period of 2.56 seconds is output from the Q ₇ output terminal, and a signal with a period of 5.12 seconds is output from the Q ₈ output terminal after being divided. These two signals are respectively input to the d input terminal and the e input terminal of the NOR circuit _G2 , and when both inputs are "0", the output is "1". The output of this NOR circuit G ₂ becomes “1” and the AND circuit
When the h input terminal of _G4 becomes “1”, the AND circuit
Since both inputs of _G4 become "1", its output becomes "1" and the wiper motor 7 is driven through the OR circuit _G8 . In this case, each level has a timing as shown in Figure 3, and wiper motor 7 has a timing of 5.12
The wiper is activated for 1.28 seconds every second and performs intermittent wiper operation.

Conventionally, even when the wiper switch _SW1 was switched to the intermittent position, the wiper did not operate immediately. According to this embodiment, the wiper operates immediately after the switch is operated, improving operability.

Next, when wiper switch SW ₁ is switched to the continuous (CONT) position, the g input terminal of OR circuit G ₃ becomes "1", so its output becomes "1", which causes the i input terminal of AND circuit G ₄ to become "1". becomes “1”. Further, since all inputs of the NOR circuit _G1 become "0", its output becomes "1", thereby resetting the frequency dividing circuit 3 and stopping the frequency dividing operation. Therefore, the _Q7 output terminal and the _Q8 output terminal become "0", and the output of the NOR circuit _G2 always becomes "1". As a result, both inputs of AND circuit _G4 are always “1”
Therefore, the output becomes "1" and the wiper motor 7 is continuously driven through the OR circuit _G8 . This results in a continuous wiper operation.

In this way, the pre-delay and after-delay operations of the washer-linked wiper can be controlled using the time reference signal, and the interval time of the intermittent wiper can also be controlled, and the control can be performed stably with high time accuracy. I can do it. In addition, compared to the conventional method of charging and discharging capacitors, since digital operation is performed using a logic circuit, operation is reliable without being affected by voltage and temperature fluctuations, and it is also resistant to noise. Also,
Since the main circuit does not use capacitors and can be configured with only logic circuits, frequency divider circuits, and flip-flop circuits, the entire circuit can be integrated easily, reducing costs, reducing power consumption, and improving reliability. It also becomes possible to downsize the device. Note that if the time reference signal is extracted from a crystal car watch, a clock circuit is not required. In this case, the effect will be even greater if the circuit of this device is integrated into the integrated circuit of the watch.

As described above, the washer-linked wiper control device of the present invention has high precision and stable operation, improving reliability, as well as reducing size, cost, and
This has the effect of making it possible to reduce power consumption.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the washer-linked wiper control device according to the present invention, FIG. 2 is a time chart during the washer operation, and FIG. 3 is a time chart during the intermittent wiper operation. 1... Clock circuit, 3... First frequency dividing circuit,
4... Second frequency divider circuit, 5... D-type flip-flop circuit, 7... Wiper motor, 8... Washer motor, SW ₁ ... Wiper switch, SW ₂ ... Washer switch.

Claims (1)

[Scope of utility model registration request] a first frequency dividing circuit which divides the frequency of a time reference signal and outputs a first output signal after a certain period of time after the reset is canceled when the washer switch is turned on; a second frequency dividing circuit which further divides the frequency of the output of the first frequency dividing circuit and outputs the first output signal after a certain period of time after being reset by turning off the watcher switch; and a circuit that holds the reset release of the first frequency divider circuit afterward and releases this hold when the output signal is output from the second frequency divider circuit, The drive of the wiper motor is started by the output signal of the wiper motor, and when the washer switch is turned off, the operation of the second frequency dividing circuit is started, and the drive of the wiper motor is stopped by the first output signal. The constructed washer-linked wiper control device.