| 摘要 |
A two-stroke engine has a scavenge pump provided in an intake passage, and a fuel injector provided for injecting fuel directly into a cylinder of the engine. A sensor is provided in an exhaust passge for detecting the concentration of a component of the exhaust gas, thereby detecting the actual air-fuel ratio. A desired air-fuel ratio of exhaust gas including a part of scavenging air supplied by the scavenge pump is derived from a map. The actual air-fuel ratio is compared with the desired air-fuel ratio to produce an error signal. In accordance with the error signal, the quantity of fuel injected by the fuel injector is controlled so as to cause the actual air-fuel ratio to converge to the desired air-fuel ratio.
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