| 摘要 |
PURPOSE:To secure stable combustion even if a practical compression ratio is changed by changing the temperature of the mixed air in response to the valve timing in an engine with variable valve timing. CONSTITUTION:A heating pipe 80 is arranged around a discharge pipe and is connected to an intake pipe 34 through an inlet pipe 82 and an outlet pipe 84. A temperature control damper 90 is provided at the joint section between the outlet pipe 84 and intake pipe 34 and is driven by an actuator 92. A signal from a temperature sensor 96 provided on a surge tank 32 is fed to a control circuit 79, which outputs a drive signal to the actuator 92. By controlling the opening of the damper 90 so that the temperature of the mixed air to an engine is made a preset temperature determined by the valve timing, the temperature of the mixed air is made constant, and both requirements for the excellent ignitability and flame propagation feature of the mixed air and the prevention of knocking can be harmonized. |
