Patent ID: 9523306
Filing Date: 2016-12-20
CPC Classification: F01P

Claim Text:
1. An engine cooling fan control strategy of a control system processed by a processor in a motor vehicle powered by an engine having an engine cooling fan coupled to the engine through an interface that is operable to selectively place the engine cooling fan in driven and non-driven relationship with the engine, the engine cooling fan control strategy comprising: measuring an engine coolant temperature using an engine coolant temperature sensor connected to the engine; measuring an engine oil temperature using an engine oil temperature sensor connected to the engine; determining a maximum engine coolant temperature threshold based on the engine oil temperature from a first empirically derived engine oil temperature versus engine coolant temperature calibration curve stored in the processor of the control system; determining a minimum engine coolant temperature threshold based on the engine oil temperature from a second empirically derived engine oil temperature versus engine coolant temperature calibration curve stored in the processor of the control system, which differs from the first empirically derived engine oil temperature versus engine coolant temperature calibration curve; placing the engine cooling fan in driven relationship with the engine when the engine coolant temperature exceeds the maximum engine coolant temperature threshold; and placing the engine cooling fan in non-driven relationship with the engine when the engine coolant temperature drops below the minimum engine coolant temperature threshold.