JPS6139619Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cooling system control device for an automobile, which is equipped with a radiator fan motor for engine cooling and a condenser fan motor for a cooler, and which operates these motors simultaneously during engine operation. .

In conventional cooling systems of this type, when the ignition switch is turned on, the radiator fan motor and the condenser fan motor are activated together or independently depending on the operating condition of the engine, and when the ignition switch is turned off, they are activated. Both had begun to stop working. However, especially after driving a car for a long time, the engine is still in a high temperature state immediately after the engine has stopped, so when the cooling system stops operating, the high heat of the engine is transferred to the fuel supply system, especially the carburetor, causing the percolation. If percolation occurs, it may be difficult to restart the engine.
Therefore, a system has already been proposed in which both fan motors continue to operate for a predetermined period of time immediately after the engine is stopped, and both fan motors are stopped after the ambient temperature of the engine has sufficiently decreased.
In such a device, the problem of percolation is solved, but on the other hand, since the two fan motors are kept rotating for a predetermined period of time even after the engine has stopped,
There was a problem that the battery consumed a lot of power, and even the slightest noise from the rotation of the fan became annoying when there was no engine noise.

Therefore, the present invention reduces power consumption by rotating only the radiator fan motor for a predetermined period of time after the engine is stopped and when the engine ambient temperature is high, and by causing the condenser fan motor to stop operating together with the engine. The object of the present invention is to provide a control device for a cooling system of an automobile, which prevents an increase in noise and reduces noise generation.

An embodiment of the present invention will be described below 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 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 circuit 9 is connected to the electric circuit 2 between the battery 3 and the first relay 6, and an ignition switch 10 is provided on this electric circuit 9. This electric circuit 9 is connected to one terminal of an exciting coil 11 of the first relay 6, and a cooler control circuit 12 is connected to the other terminal of the exciting coil 11. The exciting coil 11 is further earthed through a fan switch 13. This fan switch 13 is
It is attached to the bottom of the radiator (not shown) and closes the circuit when the water temperature reaches or exceeds a specified temperature.

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. 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.

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.
0 input terminal, the first input terminal of the flip-flop circuit 21
It is connected to the set input terminal C and the first input terminal of the OR circuit 22. In addition, the input terminal D is connected to the second set input terminal D of the flip-flop circuit 21.
Also, the second
are connected to the input terminals, and furthermore, the OR circuit 2
The output terminal of the flip-flop circuit 21 is connected to the reset input terminal R of the flip-flop circuit 21. This flip-flop circuit 21 is configured such that, when the second set input terminal D is at a high level and the first set input terminal C once becomes a low level, the output terminal remains unchanged until the reset input terminal R receives a high level input signal. The output signal continues to be generated from Q. Output terminal Q of timer 20 and flip-flop circuit 21
are connected to the first and second input terminals of the AND circuit 23, and by applying the output voltage of the AND circuit 23 to the base of the transistor 25 through the resistor 24, an output signal is output to the output terminal c. It's starting to become easier.

The timer 20 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 predetermined value, the thermoswitch 16
When the flip-flop circuit 21 is open, no output signal is generated from the flip-flop circuit 21, and therefore, an output signal from the AND circuit 23 is also not generated. Also, when the ignition switch 10 is opened, the ambient temperature of the engine exceeds a predetermined value and the thermoswitch 16 is activated.
When is closed, the second set input terminal D of the flip-flop circuit 21 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. AND circuit 23 operates while timer 20 is providing an output signal and applies an output voltage to transistor 25. Therefore, the timer unit 15 is connected to the thermoswitch 16.
When the ignition switch 10 is closed,
Only when the timer 20 is turned off, an output signal is generated at the output terminal c for a predetermined period of time set by the timer 20. However, even while the timer 20 is outputting the output signal,
When the ignition switch 10 is closed or the thermoswitch 16 is opened, a high level input signal is sent from the OR circuit 22 to the reset input terminal R of the flip-flop circuit 21, so the flip-flop circuit 21 stops outputting. ,
Therefore, the output from 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 the timer unit 15 generates an output signal. This output signal is sent to each excitation coil 18, 19 of the second relay 7 and third relay 8,
Excite these. Therefore, the third relay 8 opens at the same time as the second relay 7 closes. the 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 to continue 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 is sufficiently reduced by the operation of the radiator fan motor, 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 20 has elapsed after the ignition switch 10 is turned off,
The output of the timer unit 15 disappears, and the radiator fan motor 1 stops. 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, but after the engine is stopped, the radiator fan motor 1 continues to operate to lower the engine ambient temperature, and the condenser fan motor Since fan motor 4 is stopped, the power required after the engine stops is reduced to one fan motor 1.
The amount of electricity needed to operate the fan is sufficient to operate the fan, and since only one fan rotates, the noise is also reduced.

As described above, according to the present invention, when the ignition switch is opened while the ambient temperature of the engine is above a predetermined temperature, a timer unit is provided that emits an output signal for the required time, and the output signal of the timer unit Since the relay circuit for continuing the operation of the radiator fan motor and stopping the operation of the condenser fan motor, that is, the first relay 6, second relay 7, and third relay 8 in the above embodiment, is provided, the radiator is not activated while the engine is running. Although both the fan motor and the condenser fan motor are operated at the same time, after the engine is stopped, only the radiator fan motor is operated and the condenser fan motor is stopped.
Therefore, after the engine has stopped, only the power required to operate the radiator fan motor is required, which significantly reduces power consumption compared to conventional models in which both fan motors continue to rotate even after the engine has stopped. Ru. Further, the rotation sound of the fans after the engine is stopped is a noise, but according to the present invention, only one fan rotates, so the noise is reduced compared to the conventional one. In this way, an automobile cooling system control device is obtained that prevents an increase in power consumption and reduces noise generation.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram of a timer unit used in the apparatus of FIG. 1. 1...Radiator fan motor, 3...Battery, 4...Condenser fan motor, 6, 7, 8
...First, second, third relay, 10...Ignition switch, 15...Timer unit, 16
...Thermo switch.

Claims (1)

[Scope of utility model registration request] A radiator fan motor 1 and a condenser fan motor 4 are connected in parallel to a power supply via an ignition switch 10; when the ambient temperature of the engine is above a predetermined value and the ignition switch 10 a timer unit 15 that emits an output signal for a predetermined period of time after opening; a relay circuit that connects the radiator fan motor 1 to the power source and cuts off the capacitor fan motor 4 from the power source according to the output signal of the timer unit 15; A cooling system control device for an automobile.