| 摘要 |
PURPOSE:To discriminate a normal guide state from a runaway state by constituting two bridges with combinations of two coils, reference coils and resistance which are arrayed on the same plane and rectifying the outputs of both bridges to perform addition and subtraction. CONSTITUTION:Two rectangular coils wound into the same form are set adjacently to each other on the same plane as detection coils 21 and 22 respectively. The 1st and 2nd bridges are formed with the coils 21 and 22, reference coils 51 and 52 and resistances 71 and 72, and the current is supplied to both bridges from a high frequency current source 8. The outputs of these bridges are set at 0 when the coils 21 and 22 are distant away from a guide line 3, and the output signals are increased as the coils 21 and 22 get closer to the line 3. The outputs of both bridges are amplified 91 and 92 and rectified 101 and 102 to be applied to a subtractor 11 and an adder 12. The output of the subtractor 11 is defined as the zero potential output for guidance of an unmanned truck. While the output of the adder 12 is used as a signal for detection of the presence or absence of the line 3. Thus it is possible to discriminate a normal guide state from a runaway state. |
