| 摘要 |
PURPOSE:To prevent contamination of cylinder and to suppress the variation of torque by blocking fuel supply prior to the suction process when the cylinders of a cylinder number control engine are partially stopped while limiting the open operation of a suction/exhaust valve immediately after suction process and supplying fresh air. CONSTITUTION:Stop side cylinder well 2 of a cylinder number control engine is provided with an actuator 15 for changing the operating characteristic of suction/exhaust valves 1, 17, firing plug 24, and fuel injection valve 23 and controlled by a control circuit 29. When transferring from full-cylinder operation to partial-cylinder operation, fuel supply of fuel injection valve 23 at the stop side cylinder is blocked prior to the suction process while an actuator 15 is driven immediately after the suction process to normal open the exhaust valve 17 at the stop side cylinder and to open the suction valve 1 only at the final stage of the suction process thus to enclose only the fresh air in the stop side cylinder and to supply said fresh air. Consequently contamination of the cylinder due to blow-bye can be prevented and variation of torque can be suppressed. |
