| 摘要 |
PROBLEM TO BE SOLVED: To early converge an air-fuel ratio to a target air-fuel ratio in consideration of change in responsiveness of an air-fuel ratio sensor according to a change of the target air-fuel ratio. SOLUTION: The amount of hydrogen fuel to be supplied to an engine 1 is feedback-controlled so that an actual air-fuel ratio detected by an air-fuel ratio sensor 33 provided in an exhaust passage 3 of the engine 1 corresponds to a target air-fuel ratio. When the target air-fuel ratio is relatively lean (for example, air excessive rateλ=2), the responsiveness of feedback control is enhanced, compared with when the target air-fuel ratio is relatively rich (for example,λ=1). For improving the responsiveness of feedback control, for example, a value obtained by dulling processing of a detection value in the air-fuel ratio sensor 33 is used as the actual air-fuel ratio used for the feedback control, while the reflection degree of a temporally old detection value of the detection values detected by the air-fuel ratio sensor 33 is reduced more as the target air-fuel ratio is leaner in the dulling processing. COPYRIGHT: (C)2008,JPO&INPIT
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