| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device for an industrial vehicle provided with a function other than air-fuel ratio control. SOLUTION: This air-fuel ratio control device 1 for an industrial vehicle includes a flow control valve 5 provided in a main fuel passage 19, a controller 1, and an oxygen sensor 3, and controls an air-fuel ratio of an air-fuel mixture supplied to an engine by adjusting an opening of the main fuel passage 19 by the control of the flow control valve 5 based on a detection signal from the oxygen sensor 3 by the controller 2. The controller 2 determines a rough value of the flow control valve 5 based on the detection signal from a vacuum sensor 4 measuring a vacuum in an intake manifold 20 connected to the upstream of an engine 21. The controller 2 determines a learning value which is a difference between a rough value and a controlled value of the flow control valve 5 when air-fuel ratio control is carried out, determines whether the learning value is out of a normal range stored in a storage means, and outputs an alarm signal to an alarm device 7 when the learning value is out of the range. COPYRIGHT: (C)2009,JPO&INPIT
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