Software fuel volatility measurement
First Claim
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1. A method of determining degradation of a fuel system including a fuel tank of a vehicle having an engine, the method comprising:
- purging fuel vapors generated in the tank in the engine;
determining an indication of fuel volatility during said purging operation; and
enabling detection of degradation of the fuel system after the engine is stopped based on said indication.
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Abstract
A system is described using a fuel quality sensor or an estimate of fuel volatility for controlling various aspects of engine operation. For example, improved fuel tank leak detection may be achieved using an estimate of fuel volatility obtained from fuel purging operation.
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Citations
14 Claims
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1. A method of determining degradation of a fuel system including a fuel tank of a vehicle having an engine, the method comprising:
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purging fuel vapors generated in the tank in the engine; determining an indication of fuel volatility during said purging operation; and enabling detection of degradation of the fuel system after the engine is stopped based on said indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining degradation of a fuel system including a fuel tank of a vehicle having an engine, the method comprising:
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purging fuel vapors generated in the tank in the engine; determining an indication of fuel volatility during said purging operation that is affected by a rate of change of fuel vapor during said purging; and adjusting engine operation based on said indication, wherein said adjusting engine operation includes enabling detection of degradation of the fuel system after the engine is stopped. - View Dependent Claims (11)
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12. A method of determining degradation of a fuel system including a fuel tank of a vehicle having an engine, the method comprising:
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purging fuel vapors generated in the tank in the engine when fuel vapor entering the engine from a fuel system canister are below a threshold; determining an indication of fuel volatility during said purging operation; and enabling detection of degradation of the fuel system after the engine is stopped based on said indication.
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13. A system for a mobile vehicle having an engine, comprising
a fuel tank; -
a fuel system valve coupled to the fuel tank, said valve coupled between an environment of the vehicle and said tank; a fuel system canister coupled in the system; an exhaust gas sensor coupled in an engine exhaust; and a controller for purging fuel vapors generated in the tank in the engine while the engine is performing combustion, determining an indication of fuel volatility based on said purging operation; and
enabling detection of degradation of the fuel system after the engine is stopped based on said indication. - View Dependent Claims (14)
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Specification