Patent ID: 6109218
Filing Date: 2000-08-29
Classification: F01P

Abstract:
An apparatus for regulating a coolant circuit for an internal combustion engine, the coolant circuit having a radiator, a heating system heat exchanger, a coolant pump, a first coolant circuit for coolant flowing through the radiator and a second coolant circuit for the coolant flowing through the heat system heat exchanger, the apparatus comprising:a thermostat valve connected to the first coolant circuit, to the second coolant circuit and to a bypass line leading to the second coolant circuit, the thermostat valve capable of providing the coolant to the bypass line and to the second coolant circuit during a warmup or low engine temperature phase of the internal combustion engine, and capable of closing off said bypass line; anda differential pressure valve regulated as a function of engine speed and disposed in the bypass line, the differential pressure valve blocking the bypass line in the warmup or low engine temperature phase when a speed of the internal combustion engine is below a certain value so that the coolant passes completely through the second coolant circuit, the differential pressure valve opening and uncovering the bypass line when a speed of the internal combustion engine equals or exceeds the certain value so that the coolant is distributed quantitatively to the bypass line and the second coolant circuit as a function of a regulation of the differential pressure valve.