Method and apparatus for controlling the treatment of fuel vapor

Details Method and apparatus for controlling the treatment of fuel vapor Method and apparatus for controlling the treatment of fuel vapor

1994-02-03

1995-07-04

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3302

Patent

active

054290988

ABSTRACT:
The open and close frequency of an intake control valve 30 for controlling an intake amount at an open and close time proportion, is variably controlled in accordance with engine rotational speed or elapsed time. As a result, during control of fuel vapor treatment, biased supply to a specific cylinder of fuel vapor drawn into the engine from an absorption device 29 is suppressed, so that an averaged air-fuel ratio can be obtained for each cylinder. Therefore, combustion variation between the cylinders can be avoided, the increased engine vibration due to the resultant increase in combustion pressure variation reduced, and the deterioration in exhaust composition and vehicle driving performance can be minimized.

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