| 摘要 |
An excessive volume of fuel discharged by a high-pressure supply pump to a common rail due to an opened state abnormality of an inlet metering valve of the pump may result in an abnormal increase in common rail pressure. In the event of such an abnormal increase, a target idle revolution speed is newly set at an abnormal value greater than a normal value as a measure taken to increase an idle revolution speed. Thus, a pressure limiter, which has been once put in an opened valve state by an actual common rail pressure higher than a limit setting pressure, can be prevented from again entering a closed valve state. As a result, it is possible to eliminate idle performance instability caused by repetition of opened valve and closed valve states of the pressure limiter and, hence, assure reliability of the pressure limiter.
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