ICE COOLING SYSTEM FAN CONTROL CIRCUIT Russian patent published in 2009 - IPC B60K11/02 F04D27/00 

FIELD: engines and pumps.

SUBSTANCE: proposed circuit comprises fuse, fan motor with its shaft supporting the fan, thermistor and temperature indicator, amplifier, controlled flip-flop, power switch and diode. Positive bus of vehicle body circuit is connected with temperature indicator 1^st terminal and, via aforesaid fuse, with positive terminals of amplifier power supply line, controlled flip-flop, diode cathode and 1^st terminal of fan motor. The 2^nd terminal of temperature indicator is connected with thermistor and amplifier input. The amplifier output is connected with controlled flip-flop input. The flip-flop output is connected to power switch control input. Thermistor 2^nd output terminal, power switch 1^st output terminal, negative terminals of amplifier supple line and controlled flip-flop are connected with the vehicle body negative bus. Power switch 2^nd output terminal is connected to diode anode and fan motor 2^nd output terminal. Additionally, proposed system incorporates oil pressure gauge and 2^nd amplifier. Oil pressure gauge output terminal is connected to 2^nd amplifier input, the amplifier 2^nd output being connected with amplifier 2^nd input. Oil pressure gauge 2^nd output terminal and 2^nd amplifier supply line negative output terminal are connected to aforesaid negative bus. Positive bus of vehicle body circuit is connected, via fuse, with 2^nd amplifier supply line output terminal.

EFFECT: improved ICE temperature operating conditions, longer life.

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