Method of diagnosing a catalytic converter and arrangement therefor
AssigneeRobert Bosch GmbH
InventorsErich Schneider, Klaus Ries-Muller
Life of this patent
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Abstract
The invention is directed to a method of diagnosing a catalytic converter mounted in the exhaust-gas system of an internal combustion engine. An exhaust-gas probe is mounted rearward of the catalytic converter and at least one misfire of a combustion of the engine is stimulated. The reaction of the exhaust-gas probe to the stimulation of the misfire is evaluated to diagnose the catalytic converter. The invention is also directed to an arrangement for diagnosing a catalytic converter.
Claims9
A method of diagnosing a catalytic converter of an internal combustion engine having an exhaust-gas system and the catalytic converter being mounted in the exhaust-gas system, the method comprising the steps of:
- providing an exhaust-gas probe and mounting said exhaust-gas probe rearward of said catalytic converter;
- actively stimulating at least one misfire of a combustion of said engine;
- and,
- evaluating the reaction of said exhaust-gas probe to the active stimulation of said misfire to diagnose said catalytic converter.
An arrangement for diagnosing a catalytic converter of an internal combustion engine which generates exhaust gas having a flow direction through said catalytic converter, said arrangement comprising:
- means for actively stimulating at least one misfire of a combustion in said engine;
- an exhaust-gas probe mounted rearward of said catalytic converter in the flow direction of the exhaust gas;
- and,
- means for evaluating a reaction of said exhaust-gas probe to the active misfire stimulation for diagnosing said catalytic converter.
Dependencies are inferred from the claim text.