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ANTI SKID CONTROL SYSTEM

  • US 3,832,008 A
  • Filed: 02/02/1972
  • Issued: 08/27/1974
  • Est. Priority Date: 08/23/1971
  • Status: Expired due to Term
First Claim
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1. An antilocking control system in which wheel slip signals are generated for brake pressure modulation, wherein the means for generating such slip signals comprise:

  • 1. means for generating a signal which is substantially directly proportional to the rotational speed of a vehicle wheel, 2. memory means for generating a reference signal approximating the vehicle speed, said memory means being connected to said generating means to receive the signal proportional to the rotational speed and including discharge means for causing the reference signal to vary at one of two different individually selectable discharge time constants, the first discharge time constant permitting the reference signal generated by said memory means to follow the signal proportional to the rotational speed substantially without delay and the second discharge time constant permitting the reference signal to correspond to a slow decrease in vehicle speed, 3. comparison means connected to said generating means and said memory means for comparing the signal proportional to the rotational speed with the reference signal from said memory means and for generating an output signal for brake pressure modulation, when the rotational speed of the vehicle wheel is below the reference signal and in a certain relationship thereto, and 4. switching means connected to said memory means and including sensing means operatively arranged to respond to the rotational behavior of such wheel for producing a control signal when such wheel shows a tendency to lock and for terminating such control signal when a permissible slip value is reached, said switching means switching said memory means to its second discharge time constant in response to the occurrence of the control signal produced by said sensing means when a locking tendency occurs and switching said memory means back to its first time constant in the absence of such control signal.

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