| 摘要 |
<p>PURPOSE:To contrive the improvement in the utility of the apparatus for protecting the electric motor vehicle by providing monitoring means operated by a microprocessor unit (MPU) for controlling a chopper to eliminate the operation of a breaker due to the erroneous operation of the MPU and to operate the breaker only when the chopper malfunctions. CONSTITUTION:The SCR chopper 2 is connected through the breaker 6 to a DC power source 1. An accelerator signal is inputted from an accelerator 8 of the electric motor vehicle to the MPU9 connected to the accelerator 8, and the MPU9 outputs on or off pulse to the chopper 2 in a pulse forming circuit 10 on the basis of a command from the accelerator 8. An accelerator command signal is inputted to a monitoring circuit 5 to monitor the MPU9 together with the output signal from the MPU9. Consequently, the breaker is operated only when it must be operated in case that the chopper malfunctions, but is not accordingly operated in case that the MPU9 erroneously operates due to disturbance or the like.</p> |
