Patent ID: 7810457

Claim:
A system for controlling the temperature of the engine oil of an internal combustion engine of a motor vehicle, comprising: an engine oil circuit for controlling the temperature of the engine oil, said engine oil circuit including a first portion of the internal combustion engine and a coolant/engine-oil heat exchanger; a coolant circuit for controlling the temperature of the internal combustion engine, said coolant circuit, in a main branch, including a second portion of the internal combustion engine, a coolant cooler and a first coolant pump, said coolant circuit also including an auxiliary branch downstream of the coolant cooler, said auxiliary branch including the coolant/engine-oil heat exchanger and a second coolant pump; and a control and regulating unit that controls operation of the second coolant pump in the auxiliary branch as a function of engine oil temperature; wherein a coolant recirculating line of the coolant/engine-oil heat exchanger opens out into a coolant supply line of the main branch upstream of the internal combustion engine or a coolant recirculating line of the main branch downstream of the internal combustion engine; and wherein the control and regulating unit which controls the operation of the second coolant pump in the auxiliary branch controls, in parallel, the operation of a fan of the coolant cooler as a function of an engine oil temperature.