Skid control system

A skid control system for a vehicle having at least one wheel and a brake for said wheel comprising:

• wheel deceleration detecting means for providing a current representative of the deceleration of at least one wheel;
• reference generating means for generating a reference current of a predetermined magnitude including means for altering the magnitude of said reference current in response to an output signal;
• control means for providing a brake release signal and a brake reapplication signal, said control means including comparator means for comparing said current representative of wheel deceleration and said reference current for providing said output signal a predetermined delay after the attainment of a predetermined relationship therebetween, said control means subsequently comparing said current representative of said wheel deceleration and said reference current of altered magnitude for providing said brake reapplication signal upon the attainment of said predetermined relationship between said current representative of wheel deceleration and said reference current of altered magnitude, said control means being responsive to the degree that said current representative of wheel deceleration and said reference current depart from said predetermined relationship therebetween so that the attainment of said predetermined relationship is increasingly delayed for increasing departures of said current representative of wheel deceleration and said reference current from said predetermined relationship therebetween;
• and
• brake modulating means responsive to said brake release signal for effecting the release of said brake and responsive to said brake reapplication signal for effecting the reapplication of said brake.

A skid control system for a vehicle having at least one wheel and a brake for said wheel comprising:

• wheel deceleration detecting means for providing a current representative of the deceleration of at least one wheel;
• reference generating means for generating a reference current of predetermined magnitude including means for increasing the magnitude of said reference current in response to an output signal and for decreasing the magnitude of said reference current after a predetermined delay after said first output signal;
• comparator means for comparing said current representative of wheel deceleration and said reference current for providing said output signal upon the attainment of a predetermined relationship therebetween, said comparator means subsequently comparing said current representative of said wheel deceleration and said reference current of increased magnitude for providing a subsequent output signal upon the attainment of said predetermined relationship between said current representative of wheel deceleration and said reference current of increased magnitude, said comparator still subsequently comparing said current representative of wheel deceleration and said reference current of decreased magnitude for terminating said subsequent output signal upon the termination of said predetermined relationship between said current representative of wheel deceleration and said reference current of decreased magnitude, said comparator being responsive to the degree that said current representative of wheel deceleration and said reference current depart from said predetermined relationship therebetween so that the attainment of said predetermined relationship is increasingly delayed for increasing departures of said current representative of wheel deceleration and said reference current from said predetermined relationship therebetween;
• and
• brake modulating means operative with said comparator means so that said brake is not modulated responsive to the provision of said first-mentioned output signal but is modulated responsive to said subsequent output signal, said brake modulating means being further responsive to the termination of said subsequent output signal for terminating the modulation of said brake.

A skid control system for a vehicle having at least one wheel and a brake for said wheel comprising:

• wheel deceleration detecting means for providing a current representative of the deceleration of at least one wheel;
• reference generating means for generating a reference current of predetermined magnitude representing a first predetermined magnitude of wheel deceleration including means for increasing the magnitude of said reference current to represent a second predetermined magnitude of wheel deceleration of substantially greater magnitude than said first predetermined magnitude of wheel deceleration in response to an output signal and for decreasing the magnitude of said reference current to represent a third predetermined magnitude of wheel deceleration which is of substantially decreased magnitude than said first and second predetermined magnitudes of wheel deceleration after a predetermined delay after said first output signal;
• comparator means for comparing said current representative of wheel deceleration and said reference current for providing said output signal upon the attainment of a predetermined relationship therebetween, said comparator means subsequently comparing said current representative of said wheel deceleration and said reference current of increased magnitude for providing a subsequent output signal upon the attainment of said predetermined relationship between said current representative of wheel deceleration and said reference current of increased magnitude, said comparator still subsequently comparing said current representative of wheel deceleration and said reference current of decreased magnitude for terminating said subsequent output signal upon the termination of said predetermined relationship between said current representative of wheel deceleration and said reference current of decreased magnitude;
• and
• brake modulating means operative with said comparator means so that said brake is not modulated responsive to the provision of said first-mentioned output signal but is modulated responsive to said subsequent output signal, said brake modulating means being further responsive to the termination of said subsequent output signal for terminating the modulation of said brake.