JPS6328202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a cooling system of an automobile, which is equipped with a radiator fan motor for engine cooling.

In general, after driving a car for a long time, the engine is still at a high temperature immediately after it is stopped, so when the cooling system stops operating, the engine's high heat is transferred to the fuel supply system, especially the carburetor, and the engine is heated to a high temperature. Collation is more likely to occur, and if percolation occurs, it may be difficult to restart the engine. To address this issue, conventionally known systems have been known in which a timer unit is activated to continue rotating the radiator fan motor for a predetermined period of time after the engine is stopped, and then stops the rotation after the ambient temperature of the engine has sufficiently decreased. However, although these devices solve the percolation problem, they have the disadvantage of increasing battery power consumption.

Therefore, the present invention provides a manual switch device that can arbitrarily deactivate the timer unit and stop the operation of the radiator fan motor even when the ambient temperature of the engine is high. Like when you don't use
If the engine is stopped for a long enough period of time for percolation to resolve itself without the need to rotate the radiator fan motor, use this manual switch to stop the radiator fan motor and eliminate battery life. An object of the present invention is to provide the cooling system control device that prevents excessive power consumption.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a radiator fan motor 1 is connected to a battery 3, which is a power source, through an electric line 2. The capacitor fan motor 4 is
It is connected to the electric line 2 by an electric line 5. Therefore, the radiator fan motor 1 and the capacitor fan motor 4 are connected in parallel to the power supply. The electric circuit 2 includes a normally open first relay 6 that opens and closes between the motors 1 and 4 and the battery 3.
is provided. Further, a normally open second relay 7 is connected in parallel to the first relay 6.
Furthermore, the electric circuit 5 includes a normally closed third relay 8 that opens and closes between the capacitor fan motor 4 and the battery 3.
is provided.

An electric line 9 is connected to the electric line 2 between the battery 3 and the first relay 6, and an ignition switch 10 is provided on this electric line 9. This electric line 9 is connected to one terminal of the excitation coil 11 of the first relay 6, and the other terminal of the excitation coil 11 is connected to the cooler control circuit 12. The excitation coil 11 is further grounded through a fan switch 13. This fan switch 13
is attached to the lower part of a radiator (not shown) and closes the circuit when the water temperature reaches a predetermined temperature or higher.

An electric line 14 branches from the electric line 9 between the ignition switch 10 and the excitation coil 11, and this electric line 14 is connected to an input terminal a of a timer unit 15. A thermoswitch 16 is connected to another input terminal b of the timer unit 15. In some cases, this thermoswitch 16 is installed at a suitable location in the engine room, closes when the ambient temperature of the engine is higher than a predetermined temperature, and applies the voltage of the battery 3 to the timer unit 15 as an input signal. A power supply circuit 17 branched from the electric line 2 is connected to the timer unit 15. Output terminal c of timer unit 15 is connected to one terminal of each excitation coil 18, 19 of second relay 7 and third relay 8, respectively. Excitation coil 1
The other terminals 8 and 19 are both connected to the anode +B side of the battery 3.

A manual switch device 20 is provided in the power supply circuit 17 of the timer unit 15, and this switch device 2
0 is composed of an on/off type push button switch 21 inserted into the power supply circuit 17.

The timer unit 15, as shown in FIG.
It is equipped with an input terminal a that receives a signal from the ignition switch 10 and an input terminal b that receives a signal from the thermoswitch 16.
3 input terminal, the first input terminal of the flip-flop circuit 24
It is connected to the set input terminal C and the first input terminal of the OR circuit 25. In addition, the input terminal b is connected to the second set input terminal D of the flip-flop circuit 24.
Also, the second
are connected to the input terminals, and furthermore, the OR circuit 2
The output terminal of 5 is connected to the reset input terminal R of the flip-flop circuit 24. This flip-flop circuit 24 operates such that, when the second set input terminal D is at a high level, once the first set input terminal C becomes a low level, the flip-flop circuit 24 outputs a signal from the output terminal Q until the reset input terminal R receives a high level input signal. It is designed to continue generating an output signal. timer 2
3 and the output terminal Q of the flip-flop circuit 24 are
It is connected to the first and second input terminals of an AND circuit 27, and when the output voltage of the AND circuit 27 is applied to the base of the transistor 29 through the resistor 28, an output signal is output to the output terminal c. It's getting old.

The timer 23 is activated when the ignition switch 10 is opened and generates an output signal for a predetermined period of time. At this time, if the ambient temperature of the engine is below a certain value, thermo switch 1 is activated.
6 is open, no output signal is generated from the flip-flop circuit 24, and therefore, an output signal from the AND circuit 27 is also not generated. Also, when the ignition switch 10 is opened, the ambient temperature of the engine exceeds a certain value and the thermo switch 1 is activated.
6 is closed, the second set input terminal D of the flip-flop circuit 24 is at a high level and the first set input terminal C is at a low level, so an output signal is generated from its output terminal Q. , to the AND circuit 27, which operates while the timer 23 is outputting the output signal and applies the output voltage to the transistor 29. Therefore, the timer unit 15 is connected to the thermoswitch 16.
When the ignition switch 10 is closed,
Only when the timer 23 is turned off, an output signal is generated at the output terminal c for a predetermined period of time set by the timer 23. However, even while the timer 23 is outputting an output signal, when the ignition switch 10 is closed or the thermoswitch 16 is opened, a high level input is sent from the OR circuit 25 to the reset input terminal R of the flip-flop circuit 24. Since the signal is sent, the flip-flop circuit 24 stops outputting, and therefore the output of the output terminal c is also stopped.

Next, the operation of the cooling system control device shown in FIG. 1 will be explained. When the ignition switch 10 is closed and the engine is started, if the temperature of the cooling water in the radiator is low at this time, the fan switch 13 is open and the excitation coil 11 of the first relay 6 does not operate. remains open, and both fan motors 1 and 4 do not rotate. The temperature of the cooling water increases as the engine operates, and when the temperature reaches a predetermined temperature or higher, the fan switch 13 is closed, the exciting coil 11 is excited, and the first relay 6 is closed. In this way, the radiator fan motor 1 and the condenser fan motor 4 rotate simultaneously.

When the ignition switch 10 is opened to stop the engine, the excitation coil 11 of the first relay 6
The current to is cut off, and the first relay 6 is opened. However, if the ambient temperature of the engine is higher than the predetermined temperature at this time, the thermoswitch 16 is closed and an output signal is generated from the output terminal c of the timer unit 15. This output signal is transmitted to each exciting coil 18, 19 of the second relay 7 and third relay 8.
is sent to energize them. Therefore, the second
At the same time as relay 7 closes, third relay 8 opens.
As a result, the voltage of the battery 3 is applied to the radiator fan motor 1 through the electric line 2 and the second relay 7, thereby continuing its operation. However, since the capacitor fan motor 4 is cut off from the battery 3 by the third relay 8, its operation is stopped.

When the ambient temperature of the engine drops to +1000 Hz by operating the radiator fan, the thermoswitch 16 opens. Then, the output signal from the timer unit 15 is stopped, the excitation coils 18 and 19 are demagnetized, and the second relay 7 is also opened. In this way, the radiator fan motor 1 also stops.

Even when the time set by the timer 23 has elapsed after the ignition switch 10 was turned off,
The output of the timer unit 15 is stopped, and the radiator fan motor 1 is stopped. This prevents the radiator fan motor 1 from unnecessarily operating for a long time and consuming the electric power of the battery 3.

In this way, while the engine is running, both the radiator fan motor 1 and the condenser fan motor 4 are operated, and after the engine is stopped, the operation of the radiator fan motor 1 is intermittent to lower the ambient temperature of the engine, and the condenser fan motor 4 is stopped, so
The required power after the engine is stopped is sufficient to operate one fan motor 1, and since only one fan rotates, noise is also reduced.

Further, after the engine is stopped, when the on/off type push button switch 21 is opened to open the power supply circuit 17 of the timer unit 15, the timer is placed in the lower operating state. Therefore, since no output signal is generated from the output terminal c of the timer unit 15, the radiator fan motor 1 will not operate even if the ambient temperature of the engine is high.

As described above, the operation of the radiator fan motor 1 is stopped when it is obvious that the engine will be stopped for a long time, such as when returning home at night. In reality, after about an hour and a half has passed after the engine has stopped, even if percolation occurs in the fuel supply system, it will be resolved by natural cooling and the engine will be in a state where it is easy to restart. becomes. By this, battery 3
unnecessary power consumption is avoided. Above switch 2
1 may be closed between the time the engine is next operated and the time it is stopped.

Incidentally, as the manual switch device 20, it is also possible to employ one as shown by the chain line in FIG.
That is, the OR circuit 25 is provided with a third input terminal, which is connected to a normally closed push button switch 21', and when the push button switch 21' is opened, the OR circuit 2
Cancel circuit 2 that sends a high level input signal to 5
2 are connected. In this device, after the engine is stopped, the push button switch 21'
Once opened, the cancel circuit 22 becomes the OR circuit 2.
Since a high level input signal is sent to 5, the OR circuit 2
A high level input signal is sent from the flip-flop circuit 5 to the reset terminal R of the flip-flop circuit 24, and the output of the output terminal Q can be stopped to stop the operation of the radiator fan motor 1. Moreover, even if the push-button switch 21' returns to the closed position, this state is maintained until the flip-flop circuit 24 receives a new predetermined input signal. Such a return operation is unnecessary, and there is an advantage that problems such as percolation caused by forgetting to perform the return operation can be prevented.

As described above, according to the present invention, when the ignition switch is opened while the temperature in the engine room is above a predetermined temperature, a timer unit that emits an output signal for a predetermined period of time, and a radiator is activated by the output signal of the timer unit. A relay circuit that allows the fan motor to continue operating and a manual switch device that can arbitrarily disable the timer unit are installed, so if the manual switch device is not operated after the engine has stopped, the ambient temperature of the engine will not exceed a predetermined temperature. If so, the radiator fan motor will continue to operate for a predetermined period of time, preventing the occurrence of percolation in the fuel supply system, improving restartability of the engine in high-temperature conditions, and percolation being naturally eliminated. When the engine is stopped for a long period of time, the manual switch device can be operated to stop the continuous operation of the radiator fan motor, thereby preventing unnecessary power consumption of the battery.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG. 2 is a circuit diagram of a timer unit used in the electric circuit of FIG. 1...Radiator fan motor, 3...Battery as a power source, 6, 7...1st and 2nd relays,
10...Ignition switch, 15...Timer unit, 16...Thermoswitch, 20...
Manual switch device.

Claims (1)

[Claims] 1 A radiator fan motor 1 connected to a power source via an ignition switch 10; outputs power for a predetermined period of time from the time the ignition switch 10 is opened when the ambient temperature of the engine is above a predetermined value. A timer unit 15 that emits a signal; a relay circuit that connects the radiator fan motor 1 to a power source according to the output signal of the timer unit 15; and a manual switch device 20 that can arbitrarily disable the timer unit 15. Automotive cooling system control device.