| 摘要 |
PURPOSE:To make assurable the effect of the change of an EGR quantity by seeking an EGR rate from an engine revolution number and a boost pressure operated from atmospheric pressure and an intake pipe pressure, and operating an air-fuel ratio correctional coefficient from this EGR rate, and correcting a fuel injection quantity. CONSTITUTION:During the operation of an engine 1, a boost pressure is operated at an ECU 7 on the basis of respective detection values of an intake pipe pressure sensor 14 and an atmospheric pressure sensor 18, and an EGR rate under the present operation is sought, through the use of a predetermined pattern drawing, from this boost pressure and an engine revolution number sought at an engine revolution number sensor 16. Next, an air-fuel ratio correctional coefficient for the purpose of returning an air-fuel ratio to a proper one which copes with the remaining intake air amount is operated from this EGR rate. And the fuel injection quantity of an injector 4 is controlled by a control signal obtained by multiplying a reference fuel injection time operated according to an intake pipe pressure and the engine revolution number, by this air-fuel ratio correctional coefficient.
|
