| 摘要 |
A speed control apparatus and method for an electric car serving to aid driving and producing alarm signal if one of variable resistors, which are installed in an accelerator pedal, is out of order. The speed control apparatus for an electric car comprises at least two variable resistors for generating speed control signals, each resistance value of the variable resistors varying in accordance with stepping on the accelerator pedal, a waveform shaping section for waveform-shaping output signals of the variable resistors to remove noise components and amplifying the waveform-shaped output signals, an interface section for selectively providing the output signals of the waveform shaping section in accordance with a control signal, an analog-to-digital converter for converting output signal of the interface section into a digital signal, an electronic control unit for providing the control signal to the interface section so as to selectively receive one of the speed control signals from the variable resistors to produce a driving signal, the electronic control unit detecting a difference value between the speed control signals, controlling a driving speed of the electric car according to selected one of the speed control signals if the detected difference value is lower than a predetermined value, and producing an alarm control signal for cutting off the driving signal to stop the electric car, if the detected difference value is higher than a predetermined value, and an alarm section for producing an alarm signal according to the alarm control signal provided from the electronic control unit.
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