| 摘要 |
PURPOSE:To obtain a necessary ripple absorption factor of a suction pressure sensor output extending over a service revolving speed range of an internal combustion engine by detecting a revolving speed range of the internal combustion engine, and switching and setting a time constant of a low-pass filter. CONSTITUTION:A revolving speed range of an internal combustion engine is detected, LPFs tau1, tau2,... having each different time constant are selected by switching a switch in accordance with the range, and a time constant of the LPF for eliminating a ripple of a suction pressure sensor output is switched and set in accordance with the revolving speed range. Accordingly, a necessary ripple absorption factor of the suction pressure sensor output is obtained extending over a service revolving speed range of the internal combustion engine, the ripple factor does not become an excess by a high revolving speed as in case when the ripple factor is fixed by the least revolving speed, and the responsiveness is not deteriorated even in a high revolving area. |
