| 摘要 |
PURPOSE: To improve torque shock by comparing a control start timing of fuel supply amount in direct injection condition with fuel supply amount control start timing in pre-mixed injection condition when fuel supply condition is switched over and setting a specified delay time. CONSTITUTION: Those data such as engine speed, accelerator opening, intake air amount is read and, based on the accelerator opening data, a basic accelerator opening for pre-mixed injection→direct injection or direct injection→pre-mixed injection is calculated. In a steady-state in which fuel supply is not in the pre-mixed injection→direct injection nor direct injection→pre-mixed injection condition, when the present accelerator opening is judged to be higher than a reference accelerator opening which requires the switching of fuel supply condition to the pre-mixed injection direct injection condition with higher torque requirement, the set timer value of a fuel ratio increasing and decreasing delay timer under pre-mixed injection condition is set to Tp1 in order to gradually reduce the change of fuel ratio Rp. Then the set timer value of the fuel ratio increasing and decreasing delay timer is set to Td1 so as to change the fuel ratio Rd in the direct injection condition, and a specified delay time is set in comparison it with a fuel control start timing in the pre-mixed injection condition. |
