JPS58140416A - Controller of cooling system for automobile - Google Patents

Abstract

PURPOSE:To prevent electric power of a battery from consuming unnecessarily, by a method wherein a timer unit which drives a radiator fan for a predetermined period of time is made releasable manually when an atmospheric temperature after suspension of an engine is more than a predetermined value. CONSTITUTION:When an ignition key 10 is on, a cooling water temperature is more than a predetermined value and a fan switch 13 is closed, No.1 relay 6 is turned on and a radiator fan motor 1 and a condenser fan motor 4 are turned simultaneously. Althrough No.1 relay 6 is interrupted when an engine is suspended and No.2 relay 7 is closed, No.3 relay 8 is opened and only the radiator fan motor 1 is driven by an output signal from an output terminal (c) of a timer unit 15 when an atmospheric temperature of the engine is more than a predetermined one and a thermoswitch 16 is closed, action of the timer unit 15 can be released by a manual switch 20.

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.

Generally, 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.
In particular, if percolation occurs due to transmission to the carburetor, it may be difficult to restart the engine.Therefore, conventionally, after the engine has been stopped, a timer unit is activated for a predetermined period of time. It is known that the radiator fan motor continues to rotate and stops its rotation after the ambient temperature of the engine has sufficiently decreased. Although this solves the problem of percolation, it also reduces battery life. The disadvantage is that power consumption increases.

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. When the engine is stopped for a long time, such as when the radiator fan motor is not in use, long enough for Mohercolation to resolve itself without the radiator fan motor rotating, the radiator fan motor can be activated by operating this manual switch device. An object of the present invention is to provide the cooling system control device which stops the cooling system and prevents unnecessary power consumption of the battery.

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 as a power source through an electric line 2. As shown in FIG. 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 is provided with a normally open first relay 6 that opens and closes between the motors 1 and 4 and the battery 3. Further, a normally open second relay 7 is connected in parallel to this first IJ relay.

Further, the electric circuit 5 is provided with a normally closed third relay 8 that opens and closes between the capacitor fan motor 4 and the battery 3.

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 an excitation coil 11 of the first IJ circuit, and the other terminal of the excitation coil 11 is connected to a cooler control circuit 12. The excitation coil 11 is further grounded through a fan switch 13. This fan switch 1
3 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.

Ignition switch 1o of electric circuit 9 and excitation coil 11
An electric line 14 branches from between the two, and this electric line 14 is connected to the timer unit 150 input terminal α. A thermoswitch 16 is connected to another input terminal of the timer unit 15. This thermo switch 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 . The output terminal C of the timer unit 15 is connected to one terminal of each excitation coil 18, 19 of the second relay 7 and the third relay 8, respectively. The other terminals of the excitation coils 18 and '19 are both connected to the anode +B side of the battery 3.

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

As shown in FIG. 2, the timer unit 15 includes an input terminal a that receives a signal from the ignition switch 10 and an input terminal that receives a signal from the thermoswitch 16, and the input terminal α is a timer 230 input terminal. First set input terminal C of flip-flop circuit 24 and OR circuit 25
is connected to the first input terminal of. In addition, the input terminal is the second set input terminal of the flip-flop circuit 24.
They are also connected to second input terminals of an OR circuit 25 via an inverter 26, and further, an output terminal of the OR circuit 25 is connected to a reset input terminal H of the flip-flop circuit 24. This flip-flop circuit 24
When the set input terminal R is at a high level, once the first set input terminal C goes to a low level, the reset input terminal R
The output terminal Q continues to generate an output signal until it receives a high-level input signal. The output terminals Q of the timer 23 and the flip-flop circuit 24 are connected to the AND circuit 2.
The output voltage of the AND circuit 27 is applied to the base of the transistor 290 through the resistor 28, so that an output signal is output to the output terminal C.

The timer 23 is activated when the ignition switch 10 is opened and generates a force signal for a predetermined period of time. At this time, if the ambient temperature of the engine is below a certain value and the thermoswitch 16 is open, the flip-flop circuit 24 will not output an output signal, and therefore the AND circuit 27 will not generate an output signal. Furthermore, when the ignition switch 10 is opened, if the ambient temperature of the engine exceeds a certain value and the thermoswitch 16 is closed, the second set input terminal of the flip-flop circuit 24 is at a high level. Since the first set input terminal C is at a low level, an output signal from its output terminal Q is applied to the generated AND circuit 27, and the AND circuit 27 is operated to open the output signal of the timer 23. The output voltage is applied to transistor 29. Therefore, the timer unit 15 generates an output signal at the output terminal C for a predetermined time period set by the timer 23 only when the ignition switch 10 is turned off while the thermoswitch 16 is closed. 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 signal is sent from the OR circuit 25 to the reset input terminal H of the flip-flop circuit 24. is sent, the flip-flop circuit 24 stops outputting, and therefore,
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 coil 6 does not operate, so the first IJ The shutter remains open and both fan motors 1 and 4 do not rotate.

The temperature of the cooling water rises due to engine operation, 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 current to the excitation coil 11 of the first relay 6 is cut off, and the first relay 6 is opened. However, if the engine atmosphere or temperature is higher than the predetermined temperature at this time, the thermoswitch 16 is closed, so the timer unit 15
An output signal is generated from output terminal C of. This output signal is transmitted to each exciting coil 18.1 of the second relay 7 and third relay 8.
9 to excite them. Therefore, the third relay 8 opens at the same time as the second relay 7 closes.

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 to continue its operation. However, since the capacitor fan motor 4 is disconnected from the battery 3 by the third relay 8, its operation is stopped.

When the atmospheric temperature of the engine becomes sufficiently low due to the operation of the radiator fan, the thermo switch 16 opens (.Then, the output signal from the timer unit 15 stops, the excitation coils 18 and 19 are demagnetized, and the second relay T also opens. 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 is 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 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 radiator fan motor 1 continues to operate to lower the ambient temperature of the engine, and the condenser fan motor Since the fan motor 4 is stopped, the power required after the engine stops is just enough to operate one fan motor 1 (also, since only one fan rotates, the noise is also reduced). .

Further, after the engine is stopped, the on/off type push button switch 21 is opened to open the power supply circuit 17 of the timer unit 15 (and the timer becomes inactive).

Therefore, since no output signal is emitted from the output terminal C of the timer unit 15, the radiator fan motor 1 will not operate even if the engine atmosphere or temperature is high.

In this way, the operation of the radiator fan motor 1 is stopped when it is obvious that the engine has been stopped for a long time, such as when returning home at night.
In fact, after about an hour and a half has passed after the engine has stopped, even if percolation occurs in the fuel supply M system during that time, it will be resolved by natural cooling and the engine will be in a state where it is easy to restart. . By doing this, the
unnecessary power consumption is avoided. The switch 21 may be closed between the next time the engine is operated and the time the engine 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 a cancellation circuit 22 that sends a high level input signal to the OR circuit 25 when the push button switch 21' is opened. This is a connection between In this device, once the push-button switch 21' is opened after the engine is stopped, the cancel circuit 22 sends a high-level input signal to the OR circuit 25. A high level input signal is sent to the terminal Q, and the output of the output terminal Q can be stopped to stop the operation of the radiator fan motor 1. Moreover, in this state, the push button switch 2
Even if 1' returns to the closed position, the flip-flop circuit 2
4 is held until it receives a new predetermined input signal, there is no need for a return operation as in the case of the on/off type push button switch 21, and problems such as percolation due to forgetting the return operation can be avoided. There is an advantage that it can be prevented.

As described above, the present invention includes a timer unit that emits an output signal for a predetermined period of time when the ignition switch is opened while the temperature in the engine compartment is higher than a predetermined temperature, and a radiator fan motor that is activated by the output signal of the timer unit. A relay circuit that continues the operation of the timer unit 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 temperature of the engine atmosphere exceeds a predetermined temperature. If so, the radiator fan motor will continue to operate for a predetermined period of time, preventing percolation in the fuel supply system and improving engine restartability in high-temperature conditions. If the engine is to be stopped for a 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.
This figure is a circuit diagram of a timer unit used in the electric circuit of FIG. 1. DESCRIPTION OF SYMBOLS 1...Radiator fan motor, 3...Battery as a power source, 6, 7...1st. 2nd relay, 10...
・Ignition switch, 15...Timer unit, 16...Thermo switch, 20...Manual switch device Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] a radiator fan motor (1) connected to a power source via an ignition switch (10); when the ambient temperature of the engine is above a predetermined value, and for a predetermined period of time from when the ignition switch (10) is opened; a timer unit (15) that emits an output 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); optionally inactivating the timer unit (15); A cooling system control device for an automobile, comprising a manual switch device (20) for protecting the vehicle.