| 摘要 |
PURPOSE:To suppress increase of engine rotation thus to achieve silence by delaying the negative pressure of vacuum lead angle device thereby lagging the ignition timing upon reaching to predetermined engine rotation when warming while leaving under low temperature. CONSTITUTION:Under low temperature starting, the chock valve 3 of carburetor 1 will close to open a throttle valve 2 slightly thus to feed rich mixture gas. Under low engine rotation stage during low temperature warming, a water temperature switch 18 and a neutral switch 17 are turned on while a rotary switch 19 is turned off and the solenoid valves 12, 12' are closed. Consequently, the negative pressure in negative pressure ports 4, 5 will function onto a vacuum lead angle device 7 to lead the angle in two step thus to promote increase of engine rotation. Upon reaching of the engine rotation to a setting level (2,000rpm, for example), the rotary switch 19 will also turn on the open the solenoid valves 12, 12' thus to delay the negative pressure in said device 7 thus to lag the ignition timing and to suppress increase of engine rotation. |
