| 摘要 |
PURPOSE:To enhance the operability upon cold engine conditions and the durability of an engine, by providing two plugs in an engine combustion chamber and by carrying out 2-point ignition only upon low load condition and upon cold engine condition. CONSTITUTION:An engine coolant temperature switch 19 is disposed between a start detecting switch 18 and a relay coil 4a. Since a coolant temperature switch 19 is turned off upon cold engine conditions, electrical current does not run through a relay coil even when a high load detecting device 17 closes the switch, and therefore, the change-over to one-point ignition is prevented since relay contacts 14b is still turned on. Since the coolant temperature switch 19 is turned on after the engine is warmed up, the normal change-over mode in which the one-point ignition is carried out upon high load operation and the 2-point ignition is carried out upon low load operation, is established. Thereby, the operability of the engine upon cold engine condition is enhanced and the durability of the engine is also enhanced. |
