| 摘要 |
PURPOSE:To improve output torque especially during low speed and high load operation, by a method wherein, in a device in which an on-off valve located in an intake passage is opened in the middle of an intake stroke and an intake air temperature is increased through heat insulating compression, a fuel injecting amount is properly increased for correction. CONSTITUTION:An on-off valve 10 is located in an intake passage 8 of a diesel engine, introduction of intake air to a combustion chamber 3 is limited thereby up to the middle of an intake stroke, and intake air is introduced to the combustion chamber 3 suddenly from the middle of the intake stroke to perform heat insulation and compression. The on-off valve 10 is so designed to be closed about at a bottom dead point of a piston 2, and above opening and closing operation is effected by an on-off valve driving means 11 by means of an output signal from a CPU 12. In the CPU 12, a cylinder inner pressure state during a time between the bottom dead point of a piston and the initial stage of a compression stroke is detected by means of an output signal from a negative pressure sensor 13, and when a cylinder inner pressure is increased about to a value higher than an atmospheric pressure, an amount of fuel injected through a fuel injection valve 23 is increased for correction according to the increase pressure value.
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