| 摘要 |
PURPOSE:To carry out a control at the optimum ignition timing even on a high land by obtaining suction pipe inside pressure from the pressure difference between the signals of a suction pipe inside pressure sensor and the signals of an atmospheric pressure sensor. CONSTITUTION:The number of revolution of an engine is calculated from a crank angle detected by a crank angle sensor (blocks 1, 2). Based on the atmospheric pressure detected by an atmosperic pressure sensor, the pressure difference of a suction pipe inside pressure which is detected by a suction pipe inside pressure sensor, from the atmospheric pressure is obtained, and the result is defined as the absolute suction pipe inside pressure (blocks 3 to 5). An ignition timing is calculated based on the number of revolution of an engine and the absolute suction pipe inside pressure (steps 7 to 9). Thereby a control can be carried out at the optimum ignition timing even on a high land. |
