| 摘要 |
The passenger compartment heater 12 has a burner 14 which receives fuel via a metering device 18 and is supplied with air by a positive-displacement blower 20. The i.c. engine has an air intake 28, eg an intake manifold, and an exhaust gas treatment area 30, eg a catalytic converter. The combustion products of the space heater 12 are introduced into the engine air intake 28; this can be done even when the engine is not running by closing a valve 44 to prevent combustion products passing through the engine air filter, and acting on the engine to ensure that the intake and exhaust valves 34, 36 are held partially open to maintain communication between the air intake 28 and the exhaust treatment area 30. Thus not only is the passenger compartment heated but also parts of the engine are pre-heated. When the engine is running, valve 44 is open and the combustion products of the space heater 12 are drawn into the engine by the partial vacuum of the air intake. When the space heater 12 is not required, the positive-displacement nature of the stationary blower 20 prevents air from reaching the engine without passing through the air filter. |
