SU1208282A1 - Method of internal combustion engine cooling - Google Patents

Description

The invention relates to engine-building, in particular, to cooling systems of internal combustion engines, primarily vehicles, as well as autonomous power plants, and can be used to control the charge air temperature.

The aim of the invention is to increase the efficiency of the cooling system by maintaining the predetermined thermal conditions of the coolant.

The drawing shows a cooling system that implements a method for cooling an engine, an abundance of appearance.

The cooling system includes the cooling jacket of the engine block 1 and the head 2 of the block, water pump 3, radiator-cooler 4, louver 5 ,, fan 6 driven by belt 7 from the crankshaft 8, fan 9 with electric drive 10. Coolant temperature measured sensor 11. Shirt unit 1 and heads 2, radiator-cooler 4 communicate with each other by pipes 12 and 13, forming a large coolant circuit through pump 3. Signal from temperature sensor 11 is fed to control unit 14 by electric drive 10 and sign or 15 on the instrument panel. The power supply 16 provides power supply from the moment the engine is started.

Measurement of the temperature of the coolant can be carried out by a single sensor with an analog output simultaneously used to indicate the water temperature on the instrument panel of the car. The output voltage of the sensor is supplied to the dual level comparator circuit (two-threshold comparator) in the control unit 14. The polarities of the signals at the outputs of the comparator are mutually opposite. From one output of the comparator, the signal after amplification determines the rotation carried out from the moment of start-up, from the other the normal rotation for air supply by the fans 6 and 9 in one direction. The hysteresis, when triggered under conditions of increasing temperature and decreasing it, is regulated by variable resistance in the feedback circuit of the comparator operational amplifier up to 5 ° C.

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Coolant temperature measurement and fan motor control can also be accomplished by limiting

5 temperature switches.

The reverse-rotation control circuit can be blocked by a switch mounted on the instrument panel, which also allows manual control at any time during warm-up.

Cooling method of internal combustion engine is provided by the circulation of coolant

(5 through the cooling jacket of the engine block 1, the head of the block 2 and the radiator-okhadpaditel, and by means of a water pump 3. In this case, the radiator-cooler 4 is blown by two

20 parallel air flow with

installed in each of them fan 6 and 9, control the temperature of the coolant, compare it with the standard and control one

25 of the fluxes, depending on the difference obtained, with the help of an electric actuator

The 3Q values of the reference change the direction of air movement in the opposite direction in the regulated flow and keep the direction of movement in an unregulated one, and at a temperature equal to the value of the reference, they keep the same direction of air movement in both flows. Moreover, in order to increase the cooling efficiency of the engine during the warm-up of the coolant in both flows, equal air flow is maintained.

The method is implemented in the following way.

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After starting the engine, the electric drive 10 of the fan 9 is turned on in the direction of the air supply opposite to that supplied by the fan 6 through the normally closed contacts of the relay of the control unit 14. The temperature sensor 11 is made in the form of two

limit temperature switches. Upon reaching the lower limit of which the temperature range of the coolant is 80 ° C, the normally closed contacts of the relay open and the motor is de-energized. Further temperature rise triggers the temperature sensor.

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40

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on the upper limit when the value of i direction at temperatures92, normally open contact limits of the operating range on

the relay of the control unit 14 is closed, 5 ° C lower than when the temperature rises,

supplying voltage to the counter-current is provided by a hysteresis of polarity on the electric motor-5 mobile type sensors

dc 10, in re-TM-108, to prevent excessively

As a result, fans 6 and 9 serve frequent switching of the drive.

air through a two-Yu radiator-cooler, air recirculation through frames in parallel streams. When the cooler 4 is removed, the sensor 11 uses the sensor 11 to produce 10 times the heat, the electric drive is switched off to the cooling system for accelerating and directing it to warm-up.

Claims (2)

1. METHOD FOR COOLING THE INTERNAL COMBUSTION ENGINE, mainly a vehicle engine, by circulating coolant through the engine cooling jacket and radiator, blowing the radiator with two parallel air flows with a fan installed in each of them to control the temperature of the coolant, compare it with a reference and regulate one from flows depending on the difference obtained by means of an electric fan drive of this flow, characterized in that, in order to increase efficiency by maintaining the specified thermal regime of the engine, at the engine operating modes when the temperature of the coolant is lower than the reference value, they change the direction of air movement in the opposite direction in the regulated flow and keep the direction of movement in unregulated, and at the temperature equal to the reference value, keep one and the same direction of air movement in both flows. 2. The method of pop. 1, characterized in that during heating of the coolant in both streams an equal air flow rate is maintained. SU_ <. „1208282