JPS62283037A - Wiper control method for automobile - Google Patents

Abstract

PURPOSE:To remove the occurrence of a wiper blade stop in the course of wiping operating by constituting the wiper device wherein a wiper motor can be energized until the wiper blade returns to a predetermined stop position even if an ignition key switch has been turned OFF with a wiper operation switch ON. CONSTITUTION:A power source +B operable regardless of any ignition key position is used for feeding power to the wiper motor 1 of an automobile. And the power +B is supplied to the wiper motor 1 via a switch 4 and kept ON until the return of a wiepr blade to a predetermined position, even if the ignition key has been turned OFF. In this case, the switch 4 makes ON-OFF control with the logic circuit 5 thereof. And the logic circuit 5 is inputted with a signal SW showing that an operation switch 2 is at the OFF position, a signal AS showing that the wiper blade is at the stop position and a signal IG showing that the ignition key switch is at the ON position, respectively.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of controlling an automobile wiper, in which the ignition key switch is turned off while the wiper blade is rotating. In this case, the wiper blade does not stop halfway, but always returns to a predetermined stopping position (home position) before stopping.

(Prior Art) There is a fixed position stopping mechanism for automobile wipers that has been used in the past, as shown in FIG. Figure 4 1
is a wiper motor, and has a built-in switch SWl. This switch SW1 rotates the wiper motor 1,
It contacts side A only when the wiper blade is in the stop position,
When the wiper blade is in any other position, it is in contact with the B side.

2 in Fig. 4 is an operation switch, which has 2
Two switches SW2 and SW3 are built-in. When the switches SW2 and SW3 are in the on position, current flows from the wiper motor 1 to the switch SW2, causing the motor 1 to rotate. Next, switches SW2 and SW3 are in the off position, the wiper blade is not in the stop position, and the internal switch SW2 and SW3 are in the off position.
When WI is on the B side, current flows from wiper motor 1 to switch SW3, causing motor l to rotate, but when the wiper blade reaches the stop position, internal switch SWt contacts side A, shorting both ends of wiper motor 1. , the same motor l will stop.

(Problems with the prior art) Most conventional wipers use the wiper motor as a power source, and the power is turned on only when the ignition key switch is in the on position.
Since it uses an IG main power supply that supplies 12V, if the ignition key is turned off while the wiper motor l is rotating, the wiper blade will stop at the current position even if it is not in the normal position. However, if the wiper blade is not stopped in a fixed position, it will get in the way and make it difficult to drive, and not only will it give a bad visual impression, but if it remains stopped for a long time, the wiper blade may seize up.

(Object of the Invention) An object of the present invention is to provide a wiper control method in which the wiper blade always returns to a predetermined stop position and then stops even if the ignition key switch is turned off while the wiper motor is rotating. There is a particular thing.

(Means for Solving the Problems) The method for controlling an automobile wiper according to the present invention uses a power source that can be used as a power source to be supplied to the wiper motor l of an automobile regardless of the position of the ignition key switch, as shown in FIG. B is used, and this power is supplied to the wiper motor 1 through the switch 4, and even if the ignition key switch is turned off while the wiper motor 1 is rotating, the switch 4 remains on until the wiper blade returns to the predetermined stop position. continue,
When the wiper motor 1 returns to a predetermined stop position, it is turned off and the power supply to the wiper motor 1 is cut off.

(Operation of the Invention) The power source B shown in FIG. 1 is supplied to the wiper motor l through a switch 4 which is a relay. Power source B can be used regardless of the position of the ignition key switch.

The relay 4 is controlled to be turned on or off by a logic circuit 5.

Logic circuit 5 also operates with power supply element B. The logic circuit 5 includes a signal (SW
Three types of signals are input: a double signal, a signal indicating that the wiper blade is in the stop position (AS signal), and a signal indicating that the ignition key switch is in the on position (IGS signal).

FIG. 3 is a truth table of the logic circuit 5. As can be seen from this truth table, if the ignition key switch is turned off (IQS signal becomes 0) while wiper motor l is rotating (SW signal is 1), the wiper blade returns to the stop position (AS signal is OFF) switch 4 is OFF
(When the relay column of the truth table becomes 0), power supply B
is cut and wiper motor l stops. That is, when the ignition key switch is turned off, the wiper motor 1 does not stop unless the wiper blade returns to a predetermined stop position and the relay 4 is turned off.

(Embodiment 1) In FIG. 1, 1 is a wiper motor, 2 is an operation switch, 3 is a relay for intermittent driving of the wiper, and 6 is an intermittent time setting volume for setting the intermittent driving time of the wiper. Conventional automobiles were generally configured with these, but in the present invention, the switch 4 and logic circuit 5 shown in FIG. 1 are added to these.

(Embodiment 2) FIG. 2 is an example in which the present invention is implemented using a microcomputer 7. This microcomputer 7 includes the functions of the logic circuit 5 shown in FIG.

In Fig. 2, l is the wiper motor, 2 is the operation switch,
4 is a relay (switch) that turns on and off the power of the wiper motor, 7 is a relay that changes the rotation speed of the wiper motor, and 8 is a relay for making the wiper body. The intermittent time setting volume and A/D are analog-to-digital converters.

The microcomputer 8 has a signal (IN) indicating the position of the operation switch 2.
T, OFF, LO, HI signals), a signal indicating that the ignition key switch is in the on position (IG double signal, a signal indicating that the wiper blade is in the stop position (AS signal), and The signal from the intermittent time setting volume 6 is sent to the analog/digital converter A/D.
is entered via.

When the IG double signal is on and the operation switch 2 is at LO, the microcomputer 8 turns on the switch 4, turns off the relay 7, and makes the wiper motor 1 rotate at LO.

When the operation switch 2 is at HI, the switch 4 is turned on and the relay 7 is turned on to make the motor 1 rotate at HI. In addition, the microcomputer 8 monitors the AS signal when the operation switch 2 is turned off or the IG double signal is turned off, and at the moment the AS signal changes from the LO level to the HI level, it turns off the switch 4 and relay 6 to brake the wiper motor 1. to stop the motor l.

When the operation switch 2 is set to INT, the voltage signal of the intermittent time setting volume 6 is sent to the analog/digital converter A/
D converts it into a digital signal and inputs it, and based on the set value, the switch 4 is periodically turned on and off to perform intermittent operation.

In both the case of FIG. 1 and the case of FIG. 2, an electronic component other than a relay may be used as the switch 4.

(Effects of the Invention) The automobile wiper control method of the present invention has the following effects.

(1) Even if the wiper operation switch 2 is left on and the ignition switch is turned off, the wiper motor 1 is energized until the wiper motor returns to the predetermined stop position, so the wiper blade does not stop mid-wiping.
Be sure to stop at the designated stop position. As a result, the wiper blades get in the way, making it difficult to drive, or making it look unsightly.
There is no possibility that the wiper blade will seize up.

(2) When a microcomputer is used in the present invention, it is possible to perform the control of the present invention by using a microcomputer with sufficient capacity among various in-vehicle control microcomputers that have recently begun to be widely used. Therefore, in that case, it can be realized with less cost increase. Furthermore, it is expected that in the future automobile harnesses will be replaced by a multiple signal transmission method, but in this case, if the built-in microcontroller of the multiple station that controls the wiper can perform this function, it will be possible to use software alone with almost no increase in cost. It can also be achieved.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing different embodiments of circuits that implement the wiper control method of the present invention, FIG. 3 is an explanatory diagram of the operation of the wiper control circuit of FIG. 1, and FIG. FIG. 3 is an explanatory diagram of a wiper control circuit. 1 is wiper motor 4 is switch

Claims (3)

[Claims] (1) A power source that can be used regardless of the position of the ignition key switch is used as the power supply to the wiper motor of the automobile, and this power is supplied to the wiper motor via the switch. Even if the switch is turned off, the switch remains on until the wiper blade returns to a predetermined stop position, and when the wiper blade returns to the predetermined stop position, it is turned off and the power supply to the wiper motor is cut off. How to control automotive wipers. (2) A method for controlling an automobile wiper according to claim 1, characterized in that a relay is used as the switch. (3) A method for controlling an automobile wiper according to claim 1, characterized in that an electronic component other than a relay is used as the switch.