Leak-check apparatus of fuel-vapor-processing system, fuel-temperature estimation apparatus and fuel-temperature-sensor diagnosis apparatus
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Abstract
A fuel-vapor-processing system for an engine has a canister for accumulating fuel evaporation gas. The system has a leak-check apparatus for checking a leak on passages. The leak-check apparatus includes a leak-check means for carrying out leak-check processing when the engine if in a stopped state. The leak-check means operates only if a predetermined condition is satisfied. It is thus possible to reduce the number of times the leak-check processing is carried out and, hence, possible to reduce power consumption. For example, only if a relatively small leak is detected when the engine is in a running state, the leak-check processing is carried out in a stopped state to verify existence of such a leak. In the leak-check processing, the temperature of fuel, detected by a sensor or an estimated value, may be taken into consideration.
20 Citations
55 Claims
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1-35. -35. cancelled.
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36. A fuel-temperature estimation apparatus for estimating a fuel temperature of a fuel tank employed in an engine in a running state of the engine, the fuel-temperature estimation apparatus comprising:
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a fuel-temperature-increase estimation means for estimating an increase in fuel temperature in the fuel tank on the basis of an operating condition in the running state of the engine; and
a fuel-temperature-decrease estimation means for estimating a decrease in fuel temperature in the fuel tank on the basis of a vehicle speed and/or an intake-air temperature or on the basis of information having correlations with the vehicle speed and/or the intake-air temperature, wherein a present estimated value of the fuel temperature is updated on the basis of a fuel-temperature increase estimated by the fuel-temperature-increase estimation means and a fuel-temperature decrease estimated by the fuel-temperature-decrease estimation means. - View Dependent Claims (37, 38, 39, 40, 41, 42, 46, 47, 48, 49, 54, 55)
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- 43. A fuel-temperature estimation apparatus having a fuel-temperature estimation means for estimating a fuel temperature of a fuel tank employed in an engine in a stopped state of the engine, wherein an estimated value of the fuel temperature in the stopped state of the engine is updated on the basis of a lapse of time since the start of the stopped state or information having a correlation with the lapse of time.
Specification