US 3,944,289 AGranted

Skid control system

AssigneeTexas Instruments Incorporated

InventorJames J. Jones

Life of this patent

Estimating the term…

Loading patent…

Abstract

An anti-skid control system for vehicle brakes which is much simpler and of lower cost than prior art systems and yet provides substantially the same anti-skid brake control. The system includes a frequency-voltage converter to produce a voltage signal indicative of wheel speed which is utilized as an input to a deceleration rate detector and an acceleration differentiator connected in parallel. The acceleration differentiator provides control signals to the deceleration rate detector to set threshold values therefor. When both the deceleration rate detector and the acceleration differentiator produce output signals of proper type to an AND gate, the system deactivates the normal braking system for the vehicle to avoid a potential skid condition. The system includes an override for applying brakes when an acceleration exceeds a predetermined threshold value.

Claims5

Dependent claims

A vehicle skid control system for selectively controlling the engagement and disengagement of the brake system of the vehicle in accordance with selected braking conditions, comprising in combination:

means for generating a signal proportional to vehicle wheel speed,
a slip signal-deceleration rate detector means,
an acceleration differentiator means connected in parallel to said slip signal-deceleration rate detector means,
said wheel speed signal generating means being connected to the inputs of said slip signal-deceleration rate detector means and said acceleration differentiator means for simultaneously providing said wheel speed signal thereto,
said slip signal-deceleration rate detector means being responsive to a negative slope of said wheel speed signal exceeding a predetermined deceleration rate threshold for providing a first brake control signal as an output,
said acceleration differentiator means being responsive to a positive slope of said wheel speed signal to provide as one output an imaginary ramp signal proportional to the rate of acceleration of said wheel speed signal and being connected as an input to said slip signal-deceleration rate detector means,
brake controller means responsive to at least said first brake control signal for providing a brake inhibiting signal, and
said slip signal-deceleration rate detector means being responsive to said imaginary ramp signal from said acceleration differentiator means for discontinuing said first brake control signal when the acceleration spin-up causes said wheel speed signal to intersect with the imaginary ramp programmed by said imaginary ramp signal.

5 more elements

Dependencies are inferred from the claim text.