| 摘要 |
A two cycle crankcase compression fuel injected internal combustion engine has a first set of one or more throttle valves controlling combustion air flowing into the crankcase, and a second set of one or more throttle valves also controlling combustion air flowing into the crankcase. A throttle position sensor is coupled to the first set of throttle valves and controls fuel injection according to throttle position. Increased resolution of sensed throttle position at low engine speed is provided by admitting combustion air only through the first set of throttle valves and not through the second set of throttle valves at low engine speed for an initial given range of motion, such that greater movement of the first set of throttle valves is required to obtain a given amount of combustion air flow for a given engine speed, prior to opening the second set of throttle valves, to provide more accurate fuel injection and better driveability. Progressive throttle linkage is movable to open the first set of throttle valves through a given range of motion prior to opening the second set of throttle valves. |
