| 摘要 |
The invention relates to a cooling system for the propulsion unit of an automobile, comprising a main circuit (9) through which can flow a coolant for cooling down a first set of members of the propulsion unit to a first temperature level, a secondary circuit (26) through which can flow a coolant for cooling down a second set of members of the propulsion unit to a second temperature level lower than the first level, a main radiator (10) being part of the main circuit and a secondary radiator (31) being part of the secondary circuit, a thermostatic or controlled valve (8) being mounted in the main circuit downstream from the thermal engine (1) so as to isolate the main radiator (10) when the coolant temperature is lower than a first threshold, and an expansion tank (12) mounted in the main circuit downstream from the thermostatic valve, characterised in that the connections are such that the secondary radiator (31) can also be part of the main circuit in a given operation mode of the system. The system may further include an additional radiator (11) mounted parallel to the main radiator (10), and a second valve (31b) capable of allowing or blocking the passage of the coolant from the thermal engine (1) to the secondary radiator. |
