Importance

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Abstract

A cooling circuit for an internal combustion engine has a main heat exchanger for cooling cooling medium circulating in the cooling circuit. A secondary heat exchanger provides heating of heating air to be supplied to a vehicle interior. A thermostatic valve has a simple design which makes it possible to heat the vehicle interior even in the case of a maximum cooling capacity for the internal combustion engine. An inlet of the thermostatic valve is connected to an outlet of the internal combustion engine and a first outlet of the thermostatic valve is connected to an inlet of the main heat exchanger. An outlet of the main heat exchanger is connected to an inlet of the internal combustion engine and a second outlet of the thermostatic valve is connected to the inlet of the internal combustion engine via a short-circuit line. An inlet of the secondary heat exchanger is connected to the second outlet of the thermostatic valve and an outlet of the secondary heat exchanger is connected to the inlet of the internal combustion engine. The thermostatic valve is designed in such a way that, in a first end position (cooling mode), it fully opens the first outlet and throttles the second outlet, in an intermediate position (mixed mode) it opens the first and second outlets to a greater or lesser extent and, in a second end position (warm-up mode), it blocks the first outlet and fully opens the second outlet.

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First Claim