Method for monitoring a system for delivering secondary air to t

Details Method for monitoring a system for delivering secondary air to t Method for monitoring a system for delivering secondary air to t

1994-11-18

1996-06-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60289, F01N 322

Patent

active

055266428

ABSTRACT:
A method for monitoring a system for delivering secondary air to an exhaust tube of an internal combustion engine. In the method 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 method is suitable for monitoring the function of a system for delivering secondary air to the exhaust tube of an internal combustion engine.

REFERENCES:
patent: 4200071 (1980-04-01), Maurer
patent: 5119631 (1992-06-01), Kayanuma
patent: 5136842 (1992-08-01), Achleitner

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