| 摘要 |
A heat exchanger has a fixed external wall enclosing heat exchange elements containing the exhaust gases with an opening to connect the outside to the inside of the exchanger wall. A movable part is attached to the fixed part which open and close the opening in the wall as a function of the temperature of the exhaust gases in the heat exchange elements. Exhaust line for a thermal engine (2) in a vehicle connected at one end to an outlet (2a) from the engine, then to a heat exchanger (4) using the exhaust gases and atmospheric air and designed so the heat exchange capacity increases with the temperature of the exhaust gases, then a depollution device (3), in particular a NOx trap. The heat exchange elements comprise a number of tubes with parallel axes and a collective inlet and a collective outlet for the exhaust gases. The movable part of the wall is made of two parallel plates fixed on top of each other and with different thermal expansion coefficients, analogous to a bilaminar strip. The heat exchanger and the depollution device are placed on the floor of the vehicle or in the engine compartment. An Independent claim is also included for a heat exchanger whose capacity increases with the exhaust gas temperature as the vehicle moves. |
