| 摘要 |
PROBLEM TO BE SOLVED: To make promptly graspable the causes of an abnormality when the driving state of a working vehicle becomes abnormal. SOLUTION: Data such as input signals from a control lever, detect signals from a lift arm sensor, output signals to an elevator solenoid, etc., are continuously stored in a memory device during driving. The data stored in the memory device are discarded every specified time n minutes, and new data are continuously stored. Supposed that the lift arm sensor is accompanied with a contact failure in a time interval of t1-t2 and brought into a safety mode, a controller self judges that the driving state is abnormal and preserves data of the preceding and succeeding n minutes in a detachable memory medium such as a CD-R or the like without discarding the data.
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