| 摘要 |
PURPOSE:To promote the orientation to low vibration and low noise, by controlling a main passage intake throttle valve opening by an engine speed and an injection pump output control lever position and duty controlling a subpassage intake throttle valve opening through a PI control of a pressure control valve when combustion deteriorates. CONSTITUTION:In the case of an engine which respectively provides intake throttle valves 3a, 3b in main and subintake passages, the intake throttle valve 3a is controlled by an opening calculating means 22. That is, on the basis of outputs of an engine speed sensor 7 and a fuel injection pump output control lever position sensor 6a, referring a valve opening to be calculated to a main passage intake throttle valve opening map stored in a memory 21, the engine, in accordance with the calculated valve opening, drives the intake throttle valve 3a to be opened and closed through an actuator S. While the engine, considering outputs of exhaust smoke sensors 5a, 5b detecting the deterioration of combustion, controls the subpassage intake throttle valve 3b to be opened and closed through an actuator 11 in accordance with a pressure signal via a pressure control valve 10 driven by duty ratio calculated in a duty ratio calculating means 24.
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