Fluid-pressure and analogous brake systems – Inertia control
Patent
1975-04-21
1976-11-23
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Inertia control
303 21BE, 303 21B, B60T 802
Patent
active
039933636
ABSTRACT:
An electronic control circuit for an anti-lock vehicle brake system which includes apparatus responsive to an input signal having a quantity which is a function of wheel speed to produce an output signal for causing energization of a solenoid valve when the quantity undergoes a change corresponding to a change in wheel speed at a rate in excess of a first predetermined rate of change of wheel speed and by an amount which is greater by a given percentage than its amount of change would have been had its change of wheel speed continued at said first predetermined rate of change. The latter corresponds to a reference rate of wheel deceleration. Other apparatus responsive to the input signal when the output signal is produced to store an initial reference velocity signal that has a predetermined relationship with the actual wheel speed to which the value of the quantity then existing corresponds. Other apparatus is responsive after a predetermined period for producing a generated signal following the initial storage of the reference velocity signal. The generated signal corresponds initially to the reference velocity signal but then decreases at a second predetermined rate of change of wheel speed greater than the first reference rate of wheel speed and for a variable period whose duration is a function of the initially stored reference velocity. This apparatus is responsive following the variable period for then increasing the generated signal at a third predetermined rate of change of wheel speed until it attains a predetermined value having a given relationship with the initially stored reference velocity. This apparatus is also responsive following the attainment of the predetermined value by the generated signal to decrease the latter at a fourth predetermined rate of change of wheel speed. Additional apparatus is responsive to the input signal for terminating the output signal to cause solenoid de-energization whenever the quantity assumes a value corresponding to a wheel speed having a given relationship with the prevailing value of the generated signal.
REFERENCES:
patent: 3635530 (1972-01-01), Packer et al.
patent: 3825305 (1974-07-01), Kasselmann et al.
patent: 3854779 (1974-12-01), Skoyles et al.
Sharp Denis
Skoyles Derek Robert
Kunin Stephen G.
Trifari Frank R.
U.S. Philips Corporation
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