| 摘要 |
A petrol injection system for an internal combustion engine, the system being adapted to provide additional petrol into the inlet manifold of the engine during acceleration conditions in order to compensate for the less efficient transference of vapourised fuel to the engine cylinders during acceleration conditions, the quantity of additional fuel (BA) being determined in accordance with a stored enrichment value (FBAAM) which is adjusted regularly to take account of changing engine conditions. During the warming-up phase of the engine when the normal lambda regulation is inactive, the magnitude and direction of adjustment of the acceleration enrichment value (FBAAM) is derived from the behaviour of the rotational speed (n) of the engine and the lambda probe signal ( lambda <1 or lambda >1) during an acceleration enrichment operation in that if, during an acceleration enrichment operation in the warming-up phase of the engine, it is detected that the lambda probe output continues to indicate a rich mixture ( lambda <1) and that there was an engine speed drop, it is concluded that the acceleration enrichment factor is too high and steps are taken to reduce it. However, if it is detected that the lambda probe has changed to indicate a lean mixture and that there was an engine speed drop, it is concluded that the acceleration enrichment factor is too low and steps are taken to increase it. |
