| 摘要 |
<p>PURPOSE:To reset a protective circuit when any malfunction is occurred without being noticed by an operator, by a method wherein an accelerator reset circuit, putting a thyristor OFF for a short period of time when an accelerator is returned and resetting the protective circuit, is provided in the title controller. CONSTITUTION:When an accelerator 12 is treaded, an accelerator switch 121 is put OFF and a voltage is impressed on the converting input terminal of an operating amplifier 131 in an accelerator reset circuit 13. As a result, the output of the operating amplifier 131 becomes low level and the electric charge of a capacitor 139 is discharged through a diode 137 and a resistor 138, however, a transistor 132 is being put OFF. When the accelerator 12 is returned, the accelerator switch 121 is put ON and the voltage of the converting input terminal of the operating amplifier 131 is reduced due to a current, conducted through a diode 133 and a resistor 134, whereby the output of the same terminal becomes high level. Then, charging current for the capacitor 139 is conducted through the resistors 138, 140 and the transistor 132 whereby the transistor 132 is put ON and a protective circuit may be reset in the same manner as a case upon putting the thyristor 27 for preventing runaway ON.</p> |
