JPS59220086A - Intermittent wiper device interlocked with washer - Google Patents

Abstract

PURPOSE:To reduce the size of an intermittent wiper device by employing two stages of transistors in a drive circuit of a relay for driving a motor, thereby reducing the capacity of a capacitor. CONSTITUTION:When an intermittent wiper starting switch 14 is closed, transistors 13f,13e become conductive state, a relay 12 for driving a motor becomes ON, and a wiper motor 10 is operated. When the wiper is operated, a normal open contact of a constant position stopping switch 11 is closed. When the wire is then positioned at the stopping position, the normal closed contact of the switch 11 is closed, and the wiper is stopped. Then, when the charging voltage of a capacitor 13a becomes the prescribed value, the wiper is again operated. When a washer starting switch 18 is closed, a washer motor 17 is operated, and the motor 10 is operated when the charging voltage of a capacitor 15c becomes the prescribed value after the prescribe time. The operating time of the motor 10 is determined by the capacitor 15c and a resistor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-position intermittent intermittent device that is configured so that when the wiper is operated, the wiper is always operated a set number of times. The intermittent wafer interlocking device was constructed as shown in FIG.

That is, in FIG. 1, 1 is the wiper motor, 21''
j: Fixed position stop switch, 3 is motor drive relay, 4
5 is an intermittent wiper circuit section composed of a capacitor 42L, a resistor 4b, a transistor 40, etc., 5 is an intermittent wiper start switch, and 6 is a capacitor f6a.

6b, transistor 60. 7 is a washer motor, and 8 is a washer start switch.

The time constant of the intermittent operation is determined by the resistor 4b and the capacitor 4a.

In order to reduce the size of such a configuration, chip parts can be used for resistors, transistors, etc., but the aluminum electrolytic capacitor used as a capacitor cannot be made smaller because it is not made into a chip. There are some types, but those with a large capacity are expensive and are at a significant disadvantage in terms of cost.

It is possible to reduce the capacitance of the cono capacitor to make it as compact as possible, but in order to match the time constant, the resistance value must be increased, so resistor 4b.

Since 6d is also a bias resistor for transistors 4c and 6c, there is a limit to how the transistors can operate normally, and the resistance value cannot be increased very much.

It is also possible to use transistors connected with Darlint 7 as transistors 4Q and 6C, but since the collector-emitter saturation voltage is high, there will be a loss of voltage applied to the motor drive circuit 3, resulting in a voltage reduction as a circuit unit. Characteristics deteriorate.

As described above, it is extremely difficult to reduce the size of the conventional configuration.

The present invention aims to eliminate the above-mentioned conventional drawbacks, and to provide an intermittent wire interlocking device that is inexpensive and can be miniaturized.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

First, an example shown in FIG. 2 will be described. 9 is a battery, 10 is a wiper motor, 11 is a fixed position stop switch, 12 is a motor drive relay, 13 is a capacitor 13a, a resistor 13t), 1sc+13d, This is an intermittent operation circuit section composed of transistors 13e and 13f. The capacitor l5aU is for the time constant of the intermittent time, and the transistor 131111'j is a transistor for driving the motor drive relay 12. The transistor 13f drives the bias circuit of the transistor 136. Transistor for.

Resistor 13bid: Bias resistance for transistor 13f. 14 is an intermittent wiper start switch, 15 is a program operation circuit section, and this program operation circuit section 15 includes a delay time constant capacitor 15&, a delay time constant resistor 15b,
Holding time constant capacitor 15C1 Holding time constant resistor 16
d, a charging transistor 15e1 for charging the capacitor 150, a discharge resistor 16f, and a protective resistor 15g. Further, 16 is an OR circuit of the signals of the intermittent operation circuit section 13 and the program operation circuit section 15, and a resistor 16
It is composed of a1 diodes ieb, 1ea, and a resistor i6d. 17 is the washer motor, 18i1
-j Uofunya start switch.

To explain the operation of this configuration, when the wiper is in the stop position as shown in FIG. 2 and the intermittent wiper start switch 14 is open, both ends of the capacitor 13a are charged to the power supply voltage. Here, the intermittent wiper start switch 14
f: When closed, transistors 13f and 136 immediately become conductive, motor drive relay 12 is turned on, and wiper motor 1o is operated. When the wiper motor 1o operates, the normally open contact of the fixed position stop switch 11 closes, and the potential at point A becomes twice that of the battery 9, but the electric charge in the capacitor 13& is discharged into the base circuit of the transistor 1sf, and the potential at point A becomes almost zero. down to Next, when the wiper comes to the stop position,
Since the normally closed contact of the fixed position stop switch 11 is closed and the point A becomes a negative power supply potential, the transistor 13f becomes non-conductive and enters the rewiper rest period. Eventually, the capacitor 13a is charged by the resistor 13b and when the point A becomes a positive potential, the transistor 13f becomes conductive again and the wiper operates.

In this way, the intermittent wiper operation is performed.

Further, when the washer start switch 18 is closed, the washer motor 17 is activated to spray washer fluid onto the front window. At the same time, the delay time constant capacitor 15a
When charging is started and a certain potential is reached, the charging transistor 156 becomes conductive, and charging of the holding time constant capacitor 150 is started. This holding time constant capacitor 150
When the charging potential of IVC exceeds a certain value, the transistor 13f becomes conductive via the diode 16Cff of the OR circuit 16.

Transistor 138 also becomes conductive and motor drive relay 12
is turned on and the wiper motor 1o operates.

The operating time of the wiper motor 10 is determined by a time constant determined by a holding time constant capacitor 15C and a resistor 15d.

In the above configuration, the motor drive relay 12 is driven by two stages of transistors 13e and 13f, and the resistors 13b and 15 (1 is a high resistance) can be used in the bias circuit of the transistor 13f, so the capacitor '3a+150
has a small capacity, allowing the use of small, low-cost capacitors.

Furthermore, there is no need to use a transistor with a high hFH, which is advantageous in terms of cost.

Next, another embodiment shown in FIG. 3 will be explained. It is basically the same as the embodiment shown in FIG. 2 above.

The difference lies in that the intermittent time can be adjusted as a bias resistor 1sb6 variable resistor of the transistor 13f of the intermittent operation circuit 13, and that a normally closed contact 14a'f: is provided which is batch IJgVC connected to the intermittent wiper start switch.

According to the above configuration, in the embodiment shown in FIG. 2, when the intermittent wiper start switch 14 is opened and then immediately closed during a pause, the point A is still at a negative potential and the wiper motor 10 does not start operating immediately. , intermittent wiper start switch L4 I
F: Since the normally closed contact is connected to battery 9,
When the intermittent wiper start switch 14 is turned off, the capacitor 13a is instantly charged and the potential at point %A returns to its initial state, so even if the intermittent wiper start switch 14 is immediately closed, the wipers '-e-1o will still operate. I will do it.

Since the intermittent wiper device of the present invention is configured as described above, the long-term intermittent wiper operation and the wiper operation time of the intermittent wiper operation can be set by increasing the resistance value instead of the capacitance, and by using a transistor with high hFE. It is advantageous in terms of cost, and it is also advantageous in terms of cost, and it is also possible to provide a normally closed contact for the intermittent wiper start switch connected to the battery. Therefore, even if the intermittent wiper start switch is repeatedly opened and closed quickly, the wiper will always operate when it is closed, which has the advantage of being effective for vehicle operation and ensuring safety, and is a practical printing value dog. .

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram of a conventional washer interlocking intermittent wiping device, and FIG. 2 is an electrical circuit diagram showing an embodiment of the washer interlocking intermittent wiping device of the present invention. FIG. 3 is an electrical circuit diagram of another embodiment. 9... Battery, 10... Wiper motor, 11... Fixed position stop switch, 12...
...Motor drive relay, 13...Intermittent operation circuit section, 13&.Old...Capacitor% 13b, 130
, 13d...Resistance. 13e+13f...Transistor% 14...
...Intermittent wiper start switch, 142L...
・Normally closed contact, 16...Program operation circuit section,
15a... Delay time constant capacitor, 15b...
・Group・Resistance for delay time constant, 15C・・・Capacitor for holding time constant, 16d・Old・Resistor for holding time constant, 15
θ...Charging transistor, 16f...
・Discharge resistance, isg...protective resistance, 16...
...OR circuit, 16a...Resistor, 16b,...
iec...Diode, 16d...Resistor, 17...Washer motor, 18...
・Woofunya start switch.

Claims (2)

[Claims] (1) A wiper motor, a fixed position stop switch that operates at the position of the wiper motor, a relay that drives the wiper motor, a first transistor that drives the relay, and a second transistor that drives the base of the first transistor. and a bias circuit for the third second transistor, a capacitor connecting the normally closed contact of the relay and the bias circuit, and an intermittent wiper start connected between the bias circuit and the base of the second transistor. A switch, a washer motor, a start switch that drives the washer motor, a capacitor that is charged during operation, a charging transistor that is operated by the charging potential of this capacitor, and a charging transistor that is charged by conduction of this charging transistor. An intermittent wire interlocking device comprising a capacitor and an OR circuit of a charging potential signal of the capacitor and a bias circuit signal of the second transistor. (2) The normally closed contact of the intermittent wiper starting switch between the bias circuit and the base of the second transistor is connected to the power supply, and the normally open contact is connected to the base of the second transistor. Intermittent washer interlocking device described.