| 摘要 |
PURPOSE:To enable the combustion of an engine to be switched corresponding to a condition of the outside air, by detecting a switching point between the stratified combustion and the uniform combustion by the signal of an exhaust sensor, which detects a rate of excess air, so as to switch the combustion by a stratified fuel supply means and a dispersed fuel supply means. CONSTITUTION:When a supply amount of fuel is controlled, a control means 16, in low and intermediate loads below the first preset level by a load detecting means 17, fully opens a throttle valve 14 so as to hold an intake air amount to a fixed level and supplies only stratified fuel by a fuel supply means 11, performing stratified combustion with a large rate lambda of air. Then the control means 16, if it reaches a point A above a predetermined load, starts supply of dispersed fuel by a fuel supply means 13, and if it further reaches a point B, decreases the stratified fuel, transferring the combustion from the stratified combustion to uniform combustion. Setting this point A below the rate lambda of air of an ignition limit while the point B above the rate lambda of air, in which a smoke is started to be generated, the optimum rate lambda of excess air for the switching point A is detected by the signal of an exhaust sensor 18. In this way, the combustion can be most suitably switched even if the temperature rises and the density of air changes due to high ground moving and/or supercharging. |
