| 摘要 |
PURPOSE:To prevent unstable ignition control due to extinguishing by a method wherein ignition time is feedback-controlled so that a crank angle with which cylinder pressure rising rate is maximum coincides with a specified target value and the control is inhibited when extinguishing is detected. CONSTITUTION:A pressure sensor 14 used in place of a seat metal of an ignition plug 11 takes out change in cylinder 5 pressure as an electrical signal. A controller 12 inputs an intake air amount signal S1 from an air flow meter 2, a water temperature signal S2 from a water temperature sensor 6, a crank angle signal S3 from a crank angle sensor 7, an air-fuel ratio signal S4 from an exhaust sensor 9, a pressure signal S6 from a pressure sensor 14 and a throttle full close signal. The crank signal with which cylinder 5 pressure rising rate is maximum is calculated, and ignition time is feedback-controlled so that the crank angle coincides with a pre-specified target value as well as the feedback- control is inhibited when extinguishing is detected. |
