Patent ID: 7513343

Claim:
A method for controlling a flow rate of a hydraulic oil in a brake cooling system of a vehicle, wherein the method comprises the steps of: delivery of the hydraulic oil to a proportioning valve at a constant flow rate; controlled splitting of the flow rate of the hydraulic oil coming out of the proportioning valve and directed towards a hydraulic brake cooling circuit to avoid exceeding a maximum oil pressure value in said hydraulic circuit, based on an oil temperature in the hydraulic circuit and a temperature of an engine coolant, wherein said step of controlled splitting of flow rate of the hydraulic oil coming out of the proportioning valve comprises: defining parameters: minimum engine coolant temperature TL min ; minimum hydraulic oil temperature TO min ; difference between the coolant and oil temperatures Δ on ; degree of closure of the proportioning valve DutyVP, and subsequent hydraulic circuit flow rate Q olio ; checking the following conditions: TL≦TL min and TO≦TO min 1) in this condition, set DutyVP=100%, Q olio =0; TL≧TL min and TO≦TO min 2) in this condition, if TL−TO≦Δ on , setting DutyVP=100%, Q olio =0; if TL−TO≧Δ on , self-adaptively controlling of the value DutyVP; TL≧TL min and TO≧TO min 3) T≦TL min and TO≧TO min 4) in conditions 3) and 4) setting DutyVP in proportion to the oil temperature TO, so as not to exceed a maximum oil pressure value in said hydraulic circuit.