Leak-check apparatus of fuel-vapor-processing system,...

Details Leak-check apparatus of fuel-vapor-processing system,... Leak-check apparatus of fuel-vapor-processing system,...

2006-11-28

2006-11-28

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

C073S116070

Reexamination Certificate

active

07140241

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.

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