Method for dynamic diagnosis of an exhaust gas analyzer probe

Details Method for dynamic diagnosis of an exhaust gas analyzer probe Method for dynamic diagnosis of an exhaust gas analyzer probe

2007-09-18

2007-09-18

McCall, Eric S. (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

C073S114220

Reexamination Certificate

active

11485711

ABSTRACT:
A method for the dynamic diagnosis of an exhaust gas analyzer probe situated in an exhaust-gas system having at least one exhaust-gas catalytic converter, of an internal combustion engine, a measuring signal (lambda-actual) of the exhaust gas analyzer probe being compared to a setpoint value (lambda-setpoint) as a function of the operating state of the internal combustion engine, and the system deviation being supplied to a controller, which regulates the operating parameters of the internal combustion engine correspondingly, the dynamic diagnosis of the exhaust gas analyzer probe being implemented with a closed control loop, and the deviation from the setpoint value (lambda-setpoint) of the measuring signal (lambda-actual) of a slowing exhaust gas analyzer probe being amplified by the intervention of the controller and the dynamic diagnosis is implemented on the basis of this amplified deviation. The method allows a reliable diagnosis of the dynamic response of the exhaust gas analyzer probe with excellent differentiation with respect to stochastically occurring fault signals.

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