Automotive anti-skid braking

Claim 2

An anti-skid braking system for use in a four-wheeled vehicle having one end heavier than the other comprising: a. means for applying an actuating force to said system, b. means responsive to said actuating force for braking each of said four wheels, said braking means providing a fluid braking force responsive to said actuating force, c. means for proportioning the fluid in said braking means to provide substantially greater braking action to the wheels at the heavier end of said vehicle than the wheels at the lighter end of said vehicle, d. means for sensing the speed of each wheel, e. means for comparing the difference in speed between the faster wheel at the lighter end of said vehicle and the slower wheel at the heavier end of said vehicle, and f. means for reducing said actuating force when said difference In speed exceeds a predetermined value.

Claim 3

The system of claim 1, wherein said means for sensing includes a tachometer and a frequency to voltage converting electronic circuit.

Claim 4

The system of claim 1, wherein the means of clauses (d) and (e) involve electrical signals and the means of clause (f) involves hydraulic signals.

Claim 5

The system of claim 3, wherein the means of clause (f) includes means for producing a hydraulic force that is proportional to the electrical signal quantity produced by the means of clause (e).

Claim 6

In a vehicle having four wheels and a front-end located engine, an anti-skid braking system comprising: a. hydraulic braking means including a master cylinder for applying braking force to each wheel, said braking force being applied to said wheels in response to actuating a brake pedal. b. means for proportioning the torque produced by said braking means to reduce rear wheel braking, c. means at each of said wheels for producing an analog meausre that is proportional to the speed of the wheel, d. means for selecting the analog measure related to the slower front wheel, e. means for selecting the analog measure related to the faster rear wheel, f. means for sensing the differential between the analog measures of clauses (d) and (e) and, g. means for reducing the force said brake pedal applies to said master cylinder in proportion to the amount said differential exceeds a predetermined minimum value.

Claim 7

In a vehicle having four wheels and a front-end located engine, an anti-skid braking system comprising: a. hydraulic braking means including a master cylinder for applying braking force to each wheel, said braking force being applied to said wheels in response to actuating a brake pedal. b. means for proportioning the torque produced by said braking means to reduce rear wheel braking, c. means at each of said wheels for producing an analog meausre that is proportional to the speed of the wheel, d. means for selecting the analog measure related to the slower front wheel, e. means for selecting the analog measure related to the faster rear wheel, f. means for sensing the differential between the analog measures of clauses (d) and (e) and, g. means for reducing the force said brake pedal applies to said master cylinder in proportion to the amount said differential exceeds a predetermined minimum value.

Claim 8

The system of claim 5, wherein the means of clause (c) includes an electronic circuit having an output proportional to wheel speed.

Claim 9

The system of claim 5, wherein the means of clause (g) includes a hydraulic element having a force characteristic proportional to the electrical value of said differential of clause (f).

Claim 10

The system of claim 7, wherein the means of clause (g) further includes means connected between said pedal and said master cylinder for reducing the force transmitted threbetween in proportion to the pressure supplied by said hydraulic element.

Claim 11

In a four-wheeled vehicle having a front mounted engine, an anti-skid braking system comprising: a. means for applying hydraulic braking to each of said four wheels, said means including a master cylinder and brake pedal for actuation, b. means for proportioning said hydraulic braking to apply a reduced braking action to the rear wheels of said vehicle, c. means for sensing the speed of each wheel to produce an electrical signal proportional to the speed of each wheel, d. means for selecting the electrical signal produced by the faster rear wheel, e. means for selecting the electrical signal produced by the slower front wheel, f. means for comparing the faster rear wheel signal with the slower front wheel signal to produce an output proportional to the differential between said compared signals, g. means for producing a hydraulic force proportional to said differential in said electrical signals when said differential exceeds a predetermined minimum value, and h. means responsive to said proportional hydraulic force to reduce the pressure said brake pedal applies to said master cylinder.

Claim 12

In a four-wheeled vehicle having a front mounted engine, an anti-skid braking system comprising: a. means for applying hydraulic braking to each of said four wheels, said means including a master cylinder and brake pedal for actuation, b. means for proportioning said hydraulic braking to apply a reduced braking action to the rear wheels of said vehicle, c. means for sensing the speed of each wheel to produce an electrical signal proportional to the speed of each wheel, d. means for selecting the electrical signal produced by the faster rear wheel, e. means for selecting the electrical signal produced by the slower front wheel, f. means for comparing the faster rear wheel signal with the slower front wheel signal to produce an output proportional to the differential between said compared signals, g. means for producing a hydraulic force proportional to said differential in said electrical signals when said differential exceeds a predetermined minimum value, and h. means responsive to said proportional hydraulic force to reduce the pressure said brake pedal applies to said master cylinder.