Refrigerant circuit for internal combustion engine, has transmission oil heat exchanger that is pressurized as function of pressure level of large coolant circuit and temperature of transmission oil, with coolants coolant circuits

摘要

The refrigerant circuit (1) has switchable thermostat valve (5) to switch between small coolant circuit (1a), and a large coolant circuit (1b). A main heat exchanger (3) and a transmission oil heat exchanger (6) are fluidically connected to the small coolant circuit and large coolant circuit, to control temperature of gear oil. The transmission oil heat exchanger is pressurized as a function of pressure level of large coolant circuit and temperature of transmission oil, with the coolants from small or large coolant circuits.