| 摘要 |
PROBLEM TO BE SOLVED: To supply a suitable fuel quantity by injection and to reduce an arithmetic load of the fuel quantity at the time of asynchronous injection. SOLUTION: In synchronous injection, fuel is injected from an air-fuel ratio controlling monitor 22 and an LPG injector 23 in synchronism with a crank angle standard position of an LPG engine 11. The quantity of fuel supplied by injection from the LPG injector 23 is calculated on the basis of a operating state of the LPG engine. The fuel quantity is corrected by an air-fuel ratio feedback correcting coefficient on the basis of an air-fuel ratio detected by an oxygen sensor 33 provided in a discharging passage 18. Moreover, the fuel quantity is corrected by an air-fuel ratio learning value calculated on the basis of the air-fuel ratio feedback correcting coefficient. On the other hand, at the time of asynchronous injection in an engine starting state, the quantity of fuel supplied from the LPG injector 23 by injection in corrected by the air-fuel ratio learning value calculated in the synchronous injection.
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