| 摘要 |
PURPOSE:To make an ignition timing not to be set unnecessarily to an advanced angle position, by such means that, an air-fuel ratio unstability be compensated for the engine temperature when being low, and for the engine after being warmed up, with an operation of the flow rate controller made ineffective. CONSTITUTION:In a condition of idling operation, a throttle switch 20 is closed with a solenoid on-off valve 18 closing a negative pressure path 16. Accordingly, an intake negative pressure is not applied to a diaphragm 15 with a load advanced angle device 14 not made in operation. If opened a throttle valve 3, an angle of the ignition timing is advanced. Before the engine is warmed up, that is, in a condition with a temperature sensing valve 23 being closed, when going up to a speed exceeding the engine speed, if opened the throttle valve 3, the diaphragm 15 slowly and gradually retards an ignition advanced angle to provide an ignition timing set by a governor advanced angle device. After a completion of warm-up of the engine, if opened the throttle valve 3, the ignition timing rapidly becomes an ingition timing set by the governor advanced angle device. |
