Cooling and heating system operating method for internal combustion engine in motor vehicle i.e. passenger car, involves obstructing inflowing cold coolant at removal point of mini bypass branch, during fluctuations of coolant pressures

摘要

The method involves allowing liquid heat transfer medium to exchange temporary warm with a cabin heat exchanger (4), a vehicle cooler (8). A coolant throughput is reduced to a minimum valve favorable for cooling or heating by an internal combustion engine (1) in a preset direction. A mini bypass branch (6c) is allowed to flow temporarily into a flow path from warm points at a coolant inlet (7e) during a warm-up condition and in phase with large flow stagnancy. An inflowing cold coolant is obstructed at a removal point (6cst) of the branch, during fluctuations of coolant pressures. Independent claims are also included for the following: (1) a device for operating a cooling and heating system for an internal combustion engine in a motor vehicle (2) a cooling and heating system for an internal combustion engine, comprising a cooling valve.