![]() ![]() Fan 1 will also cool to T1 after the engine is turned off. Fan 1 and Fan 2 will try to maintain the bottom coolant available to the thermostat below 80☌, and Fan 3 will provide additional cooling if the coolant entering the radiator top is above 100☌. My strategy is to monitor at the bottom and top of the radiator, Fan 1 will be run at a minimum of 30% while the vehicle is stationary, or if the air conditioning is On, or if the engine load is high, etc. To avoid heat damage the maximum coolant exit temperature should be 110☌ (T5), so extra active cooling should commence 10☌ before this at 100☌ and ramp up quickly. To ensure that T2 is quickly reached, active cooling (Fan just ON low) should only begin 10☌ lower at ~68☌ (T1). The coolant needs to be cooler than the first opening temperature by about 10☌, 78☌ (T2), but NOT much cooler or the thermostat will over-react either over-cool or stay closed too long. ![]() The thermostat starts letting coolant go through the engine from 88☌ (T3) and is full open at 99☌ (T4). My turbo diesel engine complies to Euro 3 regulations and is fitted with an 88☌ thermostat in order to always run hot enough to reduce smoke and NOx pollution. I can do the circuitry and coding fine, but I need advice on the target temperatures, strategies and timings. Please help me with my electric fan controller program design for a vehicle radiator. ![]()
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