| 摘要 |
To provide a method of processing intake air pressure signals for accurately detecting the engine load including the accelerating state and the intake air flow rate from the intake air pressure. <??>Intake air pressure signals detected with an intake air pressure sensor 15 are processed with a low-pass filter. The low-pass filter is set to cut off frequencies that are not higher than the frequency corresponding to the wavelength that is four times the length of a pressure guide pipe 23 leading to the pressure sensor 15 and to cut off frequencies that are not lower than the driving frequency of the intake valve, which eliminates electric noises and air column vibration occurring in the pressure guide pipe 23 and makes it possible to obtain smooth and real changes in the intake air pressure commensurate with the strokes. <IMAGE> |
