A hybrid electrical bus employs both a turbo diesel engine and an electric motor to drive the vehicle in different speed-torque\nscenarios. The cooling system for such a vehicle is particularly power costing because it needs to dissipate heat from not only the\nengine, but also the intercooler and the motor. An electronic control unit (ECU) has been designed with a single chip computer,\ntemperature sensors, DC motor drive circuit, and optimized control algorithm to manage the speeds of several fans for efficient\ncooling using a nonlinear fan speed adjustment strategy. Experiments suggested that the continuous operating performance of the\nECU is robust and capable of saving 15% of the total electricity comparing with ordinary fan speed control method.
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