| 摘要 |
A motor vehicle combustion engine has exhaust apparatus including a sensor for sensing exhaust content therein and fuel control apparatus determining fuel supply to the engine in accordance with an engine operating condition and a trimming factor which is a function of the engine operating condition, the values of the trimming factor corresponding to different values of the engine operating condition being chosen to help maintain a predetermined exhaust content. The engine and fuel apparatus are characterized by a transport delay between the time a change is initiated in fuel supply and the time a resulting change in exhaust content can be sensed. In its broadest aspect, the fuel supply apparatus samples successive values of the engine operating condition and, when the value of the engine operating condition is substantially the same for a time period at least equal to the transport delay and there is a difference between the exhaust content after the time period and a desired exhaust content, changes the value of the trimming factor corresponding to the value of the engine operating condition during the time period in sense to reduce the difference. In a further aspect, where the apparatus time-integrates the exhaust content, the time integral is changed as the trimming factor is changed to prevent over-correction of the trimming factor due to time delay effects in the integration. In still another aspect, the apparatus delays changing the trimming factor while the difference between the actual and desired exhaust contents is changing toward zero.
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