FIELD: transport engineering; engine cooling control systems. SUBSTANCE: proposed control system of engine radiator cooling fan with stepless speed regulation contains electric fan, storage battery whose plus terminal is coupled with first terminal of electric fan. Novelty is that system includes cooling liquid temperature transmitter, pulse duration modulation control unit, power switch and diode. Terminal of temperature transmitter is coupled with input of pulse duration modulation control unit whose output is connected with power switch control input. First power terminal of said power switch is connected with minus terminal of storage battery, and second one, with second terminal of electric fan and with diode anode. Plus terminal of storage battery is coupled with pulse duration modulation control unit and with diode cathode. EFFECT: unified control system of engine radiator cooling fan, possibility of maintaining engine temperature conditions within optimum range and a high accuracy. 1 dwg
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