| 摘要 |
PCT No. PCT/JP95/00307 Sec. 371 Date Oct. 25, 1995 Sec. 102(e) Date Oct. 25, 1995 PCT Filed Feb. 28, 1995 PCT Pub. No. WO95/23285 PCT Pub. Date Aug. 31, 1995Provided is an apparatus for early detecting a volatility of fuel supplied to an engine after engine start, in order to more precisely provide various increasing corrections during air-fuel-ratio control. During increasing-correction (S4) after engine start, a fuel-injection amount delivered to pre-selected one of cylinders is forcibly changed in a stepped manner (S6). Measured (S10) is an elapsed time T from a time (S7) when the injection-amount is changed in a stepped manner to a time (S9) when the integral Pi of a cylinder internal-pressure reflects its variation based on the stepped change in the injection amount. Since a response to a change in an air-fuel ratio is low in case of a heavy-gravity fuel and high in case of a light-gravity fuel, a fuel volatility such as a heavy gravity or a light gravity can be measured (S11) based on a time interval of said elapsed time T. On the basis of detection results, an increasing-correction amount for during cold engine is corrected (S12) to conform to fuel supplied to the engine.
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