| 摘要 |
PURPOSE:To avoid the great variation of an engine output by delaying the angle of ignition timing further when a car speed reaches to the maximum speed or a supercharging pressure is increased abnormally due to the failure of a waste gate valve. CONSTITUTION:When shifting is made to a high speed step and a car speed reaches to the maximum speed, an AND gate 34 is ON to open an electromagnetic opening and closing valve 30. Thereby, the delay angle amount is increased. When a supercharging pressure is increased abnormally due to the failure of a waste gate valve and the like, a spool 25 of a supercharging pressure detecting valve 24 falls down further by he supercharging pressure against a spring 26 to open a port 28. Consequently, the ignition timing is delayed in angle, and the output is lowered by the delay angle of ignition timing. This construction permits to prevent the great variation of the engine output in comparison with the one to lower the supecharging capacity. |
