Skid control system for two-wheeled vehicles

• US 4,035,032 A
• Filed: 04/09/1976
• Issued: 07/12/1977
• Est. Priority Date: 04/09/1976
• Status: Expired due to Term

• Current Assignee: Kelsey-Hayes Co. (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Kelsey-Hayes Co. (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Bertolasi, Robert B.
• Primary Examiner(s): Blix, Trygve M.
• Assistant Examiner(s): Eisenzopf, Reinhard J.
• Application Number:
  US05/675,263
• Time in Patent Office: 459 Days
• Field of Search: 303/91, 303/92, 303/109, 235/183, 307/228, 307/233 A, 307/233 B, 307/225 R, 307/261, 307/271, 307/295, 328/127, 328/20, 321/6
• US Class Current: 303/161
• CPC Class Codes: B60T 2270/406 Test-mode; Self-diagnosis
• CPC Class Codes: B60T 8/1706 for single-track vehicles, e.g. motorcycles
• CPC Class Codes: B60T 8/885 using electrical circuitry

Abstract

A skid control system for use in connection with controlling the application of the brakes on a two-wheeled vehicle which includes a sensor device for sensing the velocity of wheel rotation, a triple integration circuit connected to the sensor for producing an analog signal which is proportional to the wheel velocity and a proportioning circuit connected to the triple integration circuit. The output of the proportioning circuit is fed to a hysteresis and low speed cut-off circuit, and a ramp generator circuit, the outputs of the two above noted circuits being fed to the input of a comparator circuit which compares the wheel velocity with a simulated vehicle velocity signal generated by the ramp generator circuit. The output of the comparator is utilized to control a brake application valve associated with the brake system. The brake control system also includes a plurality of fail-safe systems which continuously monitor various other circuits within the brake control system and produces an output signal when a fault condition is sensed.

Claims

1. In combination in a skid control system for use in connection with controlling the braking action of at least one wheel of a vehicle, a wheel speed sensor for generating a signal in the form of a series of pulses representative of the wheel speed, a control circuit responsive to said wheel signal for controlling the braking action in accordance with said wheel signal, and a tachometer circuit connected to said sensor and said control circuit for converting said pulses to an analog signal representative of the speed of said one wheel for use by said control circuit, said tachometer circuit including a multiplicity of integrating circuits for integrating said pulses.

2. The combination of claim 1 wherein said multiplicity of integrating circuits includes at least two integrators.

3. The combination of claim 2 wherein said multiplicity of integrating circuits includes at least three integrators.

4. The combination of claim 2 further including a frequency doubling circuit, said frequency doubling circuit providing an analog output signal which represents a frequency of pulses from said wheel speed sensor which is double the number of pulses actually produced by said wheel speed sensor.

5. The combination of claim 3 further including a frequency doubling circuit, said frequency doubling circuit providing an analog output signal which represents a frequency of pulses from said wheel speed sensor which is double the number of pulses actually produced by said wheel speed sensor.

6. The combination of claim 5 wherein said multiplicity of integrating circuits are connected in tandem.

7. In combination in a skid control system for use in connection with controlling the braking action of at least one wheel of a two-wheeled vehicle, a wheel speed sensor for generating a signal in the form of a series of pulses representative of the speed of said one wheel, a tachometer circuit connected to said sensor including a multiplicity of integrating circuits for integrating said pulses to provide an analog signal representative of the speed of said one wheel, circuit means connected to said tachometer circuit for providing a signal indicative of the speed of said vehicle, comparator means for comparing said wheel speed signal to said vehicle speed signal and providing an output signal whenever a predetermined relationship exists between said two signals, and brake control means for controlling the application of the brakes of said one wheel in accordance with the output signal from said comparator means.