JPH0437002Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a wiper control device for a vehicle that can display the intermittent down time of the wiper.

"Prior Art" The configuration of a conventional wiper control device is shown in FIG.
In this conventional device, the intermittent pause time is
1 and the time constant determined by the capacitor C1. Now, when the intermittent switch INT is turned on, the base of the transistor Tr1 is grounded, so the emitter and collector of the transistor Tr1 are turned on, and the relay coil L1 is excited.
When the relay contact 1 is switched to the ground terminal side and current flows from the battery 3 to the wiper motor M, the motor M starts rotating. The cam switch 2 linked to the wiper motor M switches to the ground side, and the voltage at the connection point A between the resistor R1 and the capacitor C1 decreases, so the base voltage of the transistor Tr2 decreases and this transistor Tr2 is turned on.
When the base voltage of the transistor Tr1, which operates in a complementary manner, increases, the emitter and collector paths of the transistor Tr1 are turned off. Relay coil L
1 is no longer energized, the relay contact 1 switches from the ground terminal side to the opposing non-ground terminal side, but the wiper motor M is energized via the cam switch 2 and continues to rotate. On the other hand, the capacitor C1 is charged almost instantaneously by the battery 3 when the potential at the connection point A drops to the ground potential.

When the wiper motor M rotates once, the cam switch 2 switches to the non-earth side,
Both ends of the wiper motor M are shorted and the motor stops.
At this time, capacitor C1 starts discharging at a constant current through resistor R1 and the emitter-base path of transistor Tr2, and the potential at node A rises as capacitor C1 discharges. When the potential difference between the emitter and base of transistor Tr2 falls below the threshold, transistor Tr2 turns off, turning on complementary transistor Tr1 and causing wiper motor M, which had been intermittently stopped, to start rotating. Capacitor C1 is charged almost instantly when cam switch 2 switches to the earth side.

Here, in such a conventional control device,
Since there is no additional means for displaying the remaining time during the wiper's intermittent rest, the exerciser may be surprised by the sudden wiper operation. In addition, in the circuit diagram shown in FIG. 6, in the wiper control device in which the resistor R1 is a variable resistor, the driver sets the intermittent rest time according to the amount of rain, but there is no guideline. The settings were based on the driver's intuition. Therefore, it is necessary to reset the rest time many times in order to obtain the optimum value, which may make it difficult to concentrate on driving. Special Public Service 1977-
The idea described in Publication No. 41969 uses a transistor to sense the voltage of a capacitor that is charged when the wiper is intermittently stopped, and when the capacitor is charged higher than a predetermined value, the transistor conducts to close the relay contact and restart the motor. It is just a wiper circuit that energizes the armature, and its design does not include a means to display the remaining time when the wiper is intermittently inactive, so it has the disadvantage that the driver may be surprised by the sudden wiper operation. be.

Furthermore, the invention described in Japanese Utility Model Application Publication No. 60-1656 is an intermittent wiper drive device in which the interval between two stepwise switch operations by an automatic return type switch is set to an intermittent operation time, The device is only equipped with a means to display that the intermittent time setting stage is in progress, and does not have a means to display the remaining time during the wiper's intermittent rest, so it has the disadvantage that the driver may be surprised by the sudden wiper operation. be.

The invention described in Utility Model Application Publication No. 59-1217195 is
This is simply a device that displays the remaining time of the defogger by adding specific characters dF only when the defogger is operating on the display device that normally displays the current time as an operation indicator lamp for the defogger timer, and it has the disadvantage that exercisers may be surprised by the sudden wiper operation. It's not something that can be resolved.

"Purpose" The present invention was made in view of the above problems, and provides a measurement circuit that measures the drop in charging voltage of a capacitor using a plurality of comparators and outputs a signal during the elapse of an intermittent rest time, and the measurement circuit. To provide a wiper control device for a vehicle capable of informing a driver of the remaining time of wiper intermittent suspension by providing a plurality of display means for displaying the charging voltage drop in the middle of the intermittent suspension time using an output signal from the wiper controller. The purpose is to

"Function" In the vehicle wiper control device where the intermittent rest time is determined by the time constant of a capacitor and a resistor, there is a close relationship between the drop in the charging voltage of the capacitor and the remaining intermittent rest time of the wiper. The means allows the exerciser to be informed of the remaining time of wiper intermittent rest. Embodiment FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

The configuration of the intermittent drive circuit in this first embodiment is similar to the configuration of the conventional wiper intermittent drive circuit shown in FIG. 6, and the voltage at the connection point A of the intermittent drive circuit is as shown in FIG. It changes like that.
In other words, the voltage at the connection point A is as low as about 1 V at the time point X when the wiper motor M starts intermittent rest, and becomes as high as about 12 V at the time point Y when the intermittent rest ends, and the charging voltage of the capacitor C1 changes in the opposite way. Therefore, when the charging voltage of capacitor C1 is high (time point X), the remaining wiper intermittent pause time is long;
In a state where the charging voltage is low (time point Y), the remaining time of the wiper intermittent pause is short.

The measurement circuit is a circuit that measures the charging voltage of the capacitor C1, and the voltage at the connection point A between the capacitor C1 and the resistor R1 is input to six comparators 5a to 5f in this first embodiment. Furthermore, a set reference voltage is input to each of the comparators 5a to 5f. The reference voltage is set in six stages by seven equal-value voltage dividing resistors 4a to 4g connected in series between the power supply battery 3 and ground, and divided in the order of six voltage dividing points a to f. The piezoelectric voltage is lowered. In addition, the comparator 5
Inverters 6a to 6f are connected to the output sides of a to 5f, respectively, for inverting the presence/absence of the output signal.

The display means displays the output of the measurement circuit to the driver, and displays the output of the measurement circuit to the driver.
It consists of light emitting diodes 7a to 7f connected in series with each other through resistors. Further, the light emitting diodes 7a to 7f are each connected in parallel to the power supply battery 3.

The wiper motor M is connected in parallel between the positive and negative poles of the battery 3 via the relay switch 1, and the cam switch 2 whose movable contact 2a switches in synchronization with the motor M has its movable contact 2a connected to the relay switch 1. Connected to the non-grounded side.

(Operation of the first embodiment) In the first embodiment with the above configuration, the voltage dividing resistors 4a to 4f are equal in resistance;
The voltages at the voltage dividing points a to f, which form the reference voltages input to the comparators 5a to 5f, are equally spaced as shown in FIG. 3a. Now, the voltages at six voltage dividing points a to f are 9V, 7.5V, 6V, respectively.
4.5V, 3V, 1.5V, and the voltage at time X at the connection point A of the lower end of capacitor C1 is 0V.
At the time point X when the charging voltage of the capacitor C1 is high and the intermittent pause starts, the voltage at the connection point A is lower than the reference voltage at any of the voltage dividing points a to f, so the comparators 5a, 5b, . . . ” (hereinafter referred to as “H”) is output. Therefore, the inverters 6a, 6b, . . . , 6f all output "LOW" (hereinafter referred to as "L"). The light emitting diodes 7a, 7b, . . . 7f are all lit up because the full voltage of the battery 3 is applied to them. After a while, the voltage at connection point A becomes 2V.
At time Z when the voltage rises to , the voltage becomes higher than the reference voltage at the voltage dividing point f, so the comparator 5f outputs "L" and the inverter 6f outputs "H". Therefore, the light emitting diode 7f at the right end of the figure
Only the light goes out. As time passes further, the voltage A at the connection point increases according to the voltage-time characteristic shown in Figure 3a, so the voltage at the connection point A rises to the voltage dividing point as shown in Figure 3b. Each time the reference voltage of e, d, c, b is exceeded, the light emitting diodes 7e, 7
d, 7c, and 7b are turned off one after another, and when time point Y is reached, all the light emitting diodes 7a to 7f are turned off. Then, the wiper motor M starts operating from time point Y, as shown in FIG. At this time, the light-off cycle of the light emitting diodes 7a to 7e becomes a quadratic curve E as shown in Figure 3b, but the voltages at the voltage dividing points a to f are set at unequal intervals as shown in Figure 4a and b. By doing this, the characteristic of straight line F can be obtained.

(Second Embodiment) The configuration of the second embodiment is shown in FIG. This second
In this embodiment, the buzzer 12 is configured to sound when the last three light emitting diodes 7c, 7b, and 7a go out. For this reason, one-shot multivibrators 8a, 8b, and 8c are connected to light emitting diodes 7a, 7b, and 7c, respectively, and the outputs of each multivibrator 8a, 8b, and 8c are connected to AND circuits 10a, 10b, and 10c.
It is introduced into an OR circuit 11, and a buzzer 12 is connected to the output side of the OR circuit 11. Also, each
On the input side of the AND circuits 10a, 10b, 10c,
An oscillator 9 that outputs pulses at a constant frequency is connected. According to the configuration of this second embodiment,
When the light emitting diodes 7c, 7b, and 7a are turned off by applying an "H" signal to their lower sides, the "H"
One-shot multivibrator 8 depending on the signal
c, 8b, and 8a sequentially generate outputs, and the buzzer 12 is sounded via the AND circuits 10c, 10b, 10a, and the OR circuit 11.

In this second embodiment, the buzzer 12 can sound at different times by changing the pulse widths of the outputs of the multivibrators 8c, 8b, and 8a. Furthermore, by connecting oscillators with different oscillation frequencies to the AND circuits 10c, 10b, and 10a, it is possible to make the buzzer 12 sound with different tones.

``Effects'' As described above, since the device of the present invention has the above configuration, the driver can be aware of the remaining downtime even when the wipers are intermittently at rest, so the driver is surprised by the sudden wiper operation. You can concentrate on driving without worrying. In addition, in the wiper control device, when the driver sets the intermittent rest time, the current intermittent rest time can be recognized, making it easier to set the optimum value for the amount of rainfall, which is very convenient.
Furthermore, since the capacitor of the wiper control device is used to display the remaining intermittent rest time by the drop in its charging voltage, there are many excellent effects such as a small number of parts and a simple structure.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention;
Figure 2 is a characteristic diagram showing the change in voltage at the connection point between the capacitor and the resistor, Figures 3 and 4 are graphs showing the charging voltage and the on-off characteristics of the light emitting diode, and Figure 5 is a graph showing the change in the voltage at the connection point between the capacitor and the resistor. A circuit diagram showing an example, FIG. 6 is a circuit diagram showing a conventional wiper control device. C1... Capacitor, R1... Resistor, M... Wiper motor,... Wiper intermittent drive circuit,...
Measuring circuit, display circuit, 5a to 5f, comparator, 7a to 7f, light emitting diode, 12
……buzzer.

Claims (1)

[Scope of utility model registration request] In a vehicle wiper control device that determines the intermittent rest time using the time constant of a capacitor and a resistor,
A measurement circuit that measures the charging voltage drop of the capacitor using a plurality of comparators and outputs a signal during the intermittent rest time; and a measurement circuit that displays the charging voltage drop during the intermittent rest time using an output signal from the measurement circuit. A wiper control device for a vehicle, characterized in that it is provided with a plurality of display means.