Air pump for vehicular afterburning exhaust purification system

摘要

The fluid coupling (10) has a connection (13) for a control line (14) from the pressure side (8, 9) of the pump unit (6). Independent claims are included for an afterburning, exhaust gas purification system as well as a method of operation. The pump supplying air to the afterburner (1), is connected to the engine through the pressure-controlled fluid coupling unit. Preferred features: In the pressure control line there is a pressure limiter (15). (Note that this is also under control, externally -16). In the passive state, system pressure (ps) is passed through it, as the control pressure for the fluid coupling. In the active state, the maximum control pressure is limited to a set value (PG). Operation as described, is controlled in an on/off manner. A flushing air stream passes through the after burner in the inoperative state, its flow a fraction of the air required in the active limiting state.