| 摘要 |
PROBLEM TO BE SOLVED: To prevent the exhaust property of an internal combustion engine with a supercharger for a vehicle using gas fuel such as natural gas, from being temporarily worsened by continuously supplying extra fuel particularly during deceleration when an accelerator opening is suddenly changed to be closed by the output delay of an intake pressure sensor for detecting intake pressure, resulting in a rich air/fuel ratio during deceleration. SOLUTION: This fuel supply device comprises means for finding a set value for a boost limiter corresponding to a detected value for an engine speed and a detected value for the acceleration opening (S2-S4), means for computing an intake air amount using a detected value for intake pressure in the case of the detected value for the intake pressure < the set value for the boost limiter when comparing the detected value for the intake pressure with the set value for the boost limiter (S5, S7, S8), means for computing the intake air amount using the set value for the boost limiter instead of the detected value for the intake pressure in the case of the detected value for the intake pressure≥the set value for the boost limiter (S5, S6, S8), and a means (refer to 34 in Fig.1) for controlling a fuel supply amount corresponding to the computed value for the intake air amount to create mixture having an air/fuel ratio almost constant on the upstream or downstream side of a throttle valve. COPYRIGHT: (C)2005,JPO&NCIPI
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