| 摘要 |
1298202 Anti-skid braking systems GIRLING Ltd 16 March 1970 [31 March 1969] 16673/69 Heading F2F [Also in Division H3] A frequency to voltage converter; e.g. such as used in a vehicle anti-skid system having an input pulse rate proportional to the wheel speed, comprises a switching transistor Q1 connected to the input terminal for applying positive and negative inputs to capacitor C1 coupled to a further capacitor C2 via transistors Q2, Q3 wherein a negative input to C1 causes it to charge via the base-collector junction of transistor Q2 which conducts to charge C2 and a positive input C1 causes it to turn on transistor Q3 so that a further charging pulse is applied to C2. The resulting voltage across C2 is differentiated at C3, R8 to provide a voltage proportional to the rate of change of frequency which is applied to a Schmitt trigger Q7, Q8. If the rate of deceleration exceeds a predetermined value, schmitt trigger Q7, Q8 switches to actuate a solenoid 16 releasing the brakes. A similar frequency to voltage converter 15 may be connected to a further wheel. |
