| 摘要 |
PURPOSE: A vehicle control system is provided to accurately measure the wheel speed by constantly keeping the bias voltage of the pulse signal although the leaked electric current due to moisture is flowed in a wheel speed sensor interface circuit. CONSTITUTION: A vehicle control system is composed of a wheel speed sensor(S1), a differentiator(204), and a Schmitt trigger circuit(206). The wheel speed sensor outputs the sensor output signals of the pulse signal type corresponding to the wheel speed. The differentiator detects the rising edge and falling edge of the sensor output signals. The Schmitt trigger circuit is triggered with the rising edge and falling edge of the sensor output signals detected by the differentiator to generate the speed signal. |
