Diagnosis device for an internal combustion engine exhaust gas recycling device
First Claim
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1. A diagnosis device for detecting a malfunction of an exhaust gas recycling device of an internal combustion engine and issuing a warning of said malfunction, said exhaust gas recycling device performing exhaust gas recycling only when certain engine operating conditions aare met, said device comprising:
- first means for sensing certain engine operating parameters generally corresponding to said certain engine operating conditions and determining whether the engine is operating with performance of the exhaust gas recycling;
second means for sensing certain performance parameters indicative of performance of the exhaust gas recycling and determining whether exhaust gas recyling is actually performed; and
third means for determining a malfunction of the exhaust gas recyclying device only when said first means determine that the engine is operating with performance of the exhaust gas recycling and said second means determines that the exhaust gas recycling is not actually performed;
said first means sensing atmospheric pressure and modifying the determination of whether the engine is operating with performance of exhaust gas recycling in response to atmospheric pressure.
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Abstract
A diagnosis device of an exhaust gas recycling device of an internal combustion engine checks operating conditions of the engine and determines whether the engine is operating with performance of exhaust gas recycling based upon the checked conditions by modifying them according to atmospheric pressure.
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9 Claims
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1. A diagnosis device for detecting a malfunction of an exhaust gas recycling device of an internal combustion engine and issuing a warning of said malfunction, said exhaust gas recycling device performing exhaust gas recycling only when certain engine operating conditions aare met, said device comprising:
first means for sensing certain engine operating parameters generally corresponding to said certain engine operating conditions and determining whether the engine is operating with performance of the exhaust gas recycling;
second means for sensing certain performance parameters indicative of performance of the exhaust gas recycling and determining whether exhaust gas recyling is actually performed; and
third means for determining a malfunction of the exhaust gas recyclying device only when said first means determine that the engine is operating with performance of the exhaust gas recycling and said second means determines that the exhaust gas recycling is not actually performed;
said first means sensing atmospheric pressure and modifying the determination of whether the engine is operating with performance of exhaust gas recycling in response to atmospheric pressure.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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