using air conduits or jet air pumps, e.g. near the engine exhaust port

Full Title

Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00) > for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92) > by thermal or catalytic conversion of noxious components of exhaust > characterised by constructional aspects of converting apparatus (filtering in combination with catalytic reactors F01N3/035) > Arrangements for supply of additional air (control, e.g. using by-passes or variable air pump drives, F01N3/22) > using air conduits or jet air pumps, e.g. near the engine exhaust port