Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1993-09-24
1995-04-18
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60290, 60304, 60307, F01N 320
Patent
active
054067880
ABSTRACT:
An apparatus for monitoring a system for delivering secondary air to an exhaust tube of an internal combustion engine. In the method and apparatus, a secondary air pump is switched on and builds up a pressure on the inlet side of a blocking valve which is normally closed and not being acted upon. The blocking valve has a valve closing member that is acted upon by a predetermined closing force of an elastic element. If the secondary air quantity pumped by the secondary air pump reaches a certain minimum air quantity and pressure, then with the then-opened blocking valve, a lambda sensor disposed in an exhaust tube detects a change in the lambda value in the exhaust tube that exceeds a predetermined threshold value. The apparatus is suitable for monitoring the function of a system for delivering secondary air to the exhaust tube of an internal combustion engine.
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Dambach Dieter-Andreas
Frank Rainer
Mezger Manfred
Greigg Edwin E.
Greigg Ronald E.
Lazarus Ira S.
O'Connor Daniel J.
Robert & Bosch GmbH
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