Patent ID: 8670918
Filing Date: 2014-03-11
Classification: F02D,Y02T

Abstract:
1. An automobile-mount diesel engine, comprising: an engine body being mounted in an automobile, supplied with fuel mainly containing diesel fuel, and for selectively operating in a premix combustion mode for a low load or in a diffusion combustion mode for a high load; an injection control module for controlling an injection of the fuel into a cylinder through a fuel injection valve according to a combustion mode; and an EGR amount control module for adjusting an EGR gas amount into the cylinder; wherein, when the engine body operates in the premix combustion mode, the injection control module executes a fuel injection of a premix combustion pattern containing one or more injections at a first timing where a pressure within the cylinder is relatively low, and when the engine body operates in the diffusion combustion mode, the injection control module executes a fuel injection of a diffusion combustion pattern containing one or more injections at a second timing that is later than the first timing; wherein the EGR amount control module executes a control for introducing an amount of EGR gas into the cylinder according to an operating condition of the engine body, at least in the premix combustion mode and when shifting from the premix combustion mode to the diffusion combustion mode; wherein, when shifting from the premix combustion mode to the diffusion combustion mode with an increase in a load of the engine body, the injection control module also switches a fuel injection pattern from the premix combustion pattern to the diffusion combustion pattern and executes the fuel injection of the diffusion combustion pattern at a third timing that is later than the second timing and, after that, the injection control module executes a transition control in which the third timing is changed toward the second timing according to a change in an oxygen concentration within the cylinder; wherein the injection control module executes the transition control when shifting to the diffusion combustion mode from a state where the load of the engine body is high, that is a state where the oxygen concentration within the cylinder is below a predetermined value in the premix combustion mode; and wherein the injection control module inhibits the transition control when shifting to the diffusion combustion mode from a state where the load of the engine body is low, that is a state where the oxygen concentration within the cylinder is higher than the predetermined value in the premix combustion mode.