JPH0410135Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) Automotive wiper drive electrical circuit.

(Prior art) In order to stop the two-speed motor M for high speed drive and low speed drive and the wiper blade at a predetermined position,
The wiper motor WM, which is composed of a cam switch CS and a cam switch CS driven by a variable speed motor M, is controlled to low speed drive (Lo) or high speed drive (Hi) by the wiper switch shown in the table at the top of Figure 1. As shown in the diagram, the wiper switch and the wiper motor WM are connected by four electric wires, which is one of the reasons for the increase in the size of the wiring inside the automobile.

(Problem to be solved) In automobiles, the above-mentioned wiper switch is usually installed near the steering wheel, so the wiring to the wiper motor passes through the vicinity of the steering column and instrument panel, so the wiring should be kept to a minimum so as not to become bulky. The challenge is to reduce the circuit to only two wires.

(Means for solving the problem) A wiper switch WS has a contact 1 that can be switched to a power contact and a ground contact, and only when the contact is connected to the power contact, the high speed terminal H of the motor M and the power means A for connecting the contact to the low speed terminal L of the motor and the power source only when the contact is connected to the ground contact; means B for connecting the low speed terminal L of the motor to the power source only when the contact is not connected to any circuit contact; By using means C connected to the power supply via the contact of the wiper cam switch CS to either the high speed terminal or the low speed terminal, means B and C can be installed near the wiper motor WM, and the problem is solved. succeeded in.

(Example) The wiper switch WS shown in Fig. 2 has a power contact 2 connected to a power source E via a fuse, a ground contact 3 connected to the body of a car, etc., and a contact 1 that can be connected to these contacts. It consists of

In addition, as a means A of problem solving element, normally open contact 4
One end of the magnet coil is connected to ground, the other end is connected to the contact 1, and one of the normally open contacts 4 is connected to the high speed terminal H of the motor M.
and the other is connected to power supply E.

Further, as means B, an electromagnetic relay 7 having a normally open contact 6 is used, and one end of its magnetic coil is connected to the power source and the other end to the contact 1.

In addition, electromagnetic relays 10 and 11 having normally closed contacts 8 and 9, respectively, are mainly used as the C means, and are always connected in series during the connection between the contact 12 of the conventional wiper cam switch CS and the low speed terminal L of the motor M. The closing contacts 8 and 9 are inserted, and the electromagnetic relay 10
One end of the magnet coil is grounded, and the other end is connected to the contact 1. Further, one end of the magnet coil of the electromagnetic relay 11 is connected to the power source E, and the other end is connected to the contactor 1.

With the above configuration, the present embodiment operates as follows.

(1) In the case of wiper low speed drive, connect contact 1 of wiper switch WS to ground contact 3
When the electromagnetic relay 7 is connected, the magnet of the electromagnetic relay 7 is excited, the contact 6 is closed, and the power source E is connected to the low speed terminal L of the motor M, so that the wiper is driven. When the low speed drive is stopped, the contactor 1 is returned to the neutral position from the grounding contact 3 as shown in the figure. Since the contact 12 of the cam switch CS is in the position shown by the dotted line due to the drive of the wiper motor M, the cam switch CS remains connected to the power supply E even if the contact 1 of the wiper switch leaves the ground contact 3 and the contact 6 opens. Contacts 8 and 9 closed from the power supply contact 13 of
A voltage is supplied to the low-speed terminal L through the cam switch 1, and the motor is driven until the contact 12 of the cam switch separates from the power contact 13. When the wiper blade returns to the rest position, contact 12 of the cam switch CS mentioned above
returns to the position indicated by the solid line.

(2) For high-speed wiper drive, connect contact 1 of wiper switch WS to power contact 2.
When the electromagnetic relay 5 is connected, the magnet of the electromagnetic relay 5 is excited, the contact 4 is closed, and the power source E is connected to the high speed terminal H of the motor M, so that the wiper is driven at high speed. When high-speed driving is to be stopped, the contactor 1 is returned to the neutral position from the power supply contact 2 as shown in the figure. Due to the drive of the wiper motor M, the contact 12 of the cam switch CS is in the position shown by the dotted line, so the contact 1 of the wiper switch is connected to the power contact 2.
Even if the contact 4 is opened, voltage is supplied to the low speed terminal L from the power contact 13 of the cam switch CS connected to the power supply E through the closed contacts 8 and 9, and the contact 12 of the cam switch is connected to the power contact 13. The motor will continue to drive until it is released. When the wiper blade returns to the rest position, the above cam switch CS
The contact 12 returns to the position indicated by the solid line.

(3) Second Embodiment Although the contact 9 is connected to the low-speed terminal L at the connection point 14 in FIG. 2, it may be connected to the high-speed terminal H at the connection point 15 instead.

However, in this case, when the wiper blade is brought to rest from low speed driving, the wiper blade is once driven at high speed and then comes to rest, which is not very preferable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram for explaining a conventional example, and FIG. 2 is a circuit diagram of an embodiment, in which 5 is a normally open relay that is the main body of means A, 6 is a normally open relay that is the main body of means B, and 10 , 11 indicate normally open relays which are the main components of means C, respectively.

Claims (1)

[Scope of utility model registration request] Two-speed motor M with high-speed and low-speed terminals
and a cam switch that is driven by the motor and has a contact that is thrown into the power contact only when the motor is driven.
In an electric circuit that drives a wiper motor WM driven by a CS, a wiper switch has a contact 1 that can be switched to a power contact and a ground contact.
WS, a means A for connecting the high speed terminal H of the motor M to the power source only when the contact is in contact with the power contact, and a means A for connecting the low speed terminal L of the motor to the power source only when the contact is connected to the ground contact. means B, and means C, in which either the high-speed terminal or the low-speed terminal is connected to the power source via the contact of the wiper cam switch CS only when the contact is not in direct contact with either circuit contact.
An electric circuit that drives a wiper motor.