| 摘要 |
PURPOSE:To eliminate disadvantages of immediately stopping traveling even if an abnormality occurs in one sensor, by alternately steering a car body in the directions of untreated working place and treated working place with the other normal sensor when a sensor abnormality means detects an abnormality in the sensor. CONSTITUTION:When a sensor abnormality detecting means detects an abnormality in one of steering controlling sensors (S1) and (S2), a car body (V) is steered to a treated working place (C) as a normal sensor detects an untreated working place (B) and to an untreated working place (B) as the normal sensor detects the treated working place (C). The car body slightly meanders without running to a position at a long distance from a boundary line (L).
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