Apparatus for adjusting braking forces on vehicle wheels as a function of deceleration and acceleration of the braked wheels

Claim 1

A system of adjusting the braking force of brakes applied to a vehicle wheel, based on the deceleration and acceleration of the wheels of the vehicle during braking, comprising an element which provides a signal which is a function of the speed of each of the wheels; a shunt device receiving this signal; a diode which only passes deceleration signals connected to said shunt device; a threshold device connected to said diode for passing a control signal, means connected to said threshold device for receiving said control signal for controlling the disengagement of the brake from the corresponding wheel and operating on an all-or-nothing basis, in the case of exaggerated skidding; means including a second diode connected in parallel with the first diode and only passing acceleration signals therethrough, a memory, and a memory discharger connected in series; the signal derived from said shunting device being transmitted, during the subsequent acceleration stage of the wheel when the brake is released, through said second diode which only lets the acceleration signals pass therethrough, to said memory discharger which discharges said memory beyond a predetermined acceleration threshold in inverse proportion to the magnitude of acceleration; a charging resistor between the memory and said first diode such that the deceleration signal is passed to the memory through said charging resistor to obtain a charge which is proportional both to the value of the signal and its duration, said memory discharger including a transistor which operates on constant current, a resistor connecting the second diode to the emitter of said transistor, a resistance bridge connected to the base of the transistor for polarization thereof, said transistor being controlled by the magnitude of acceleration of the wheel when it is picking up speed, when beyond the threshold defined by the polarization of the base of said transistor, said threshold device comprising a comparator, one of the two inputs of which is polarized by a reference voltage, from a voltage-dividing bridge connected between ground and a constant voltage source, the other input of the comparator being connected to said first diode and the charging resistor.

Claim 2

A system of adjusting the braking force of brakes applied to a vehicle wheel, based on the deceleration and acceleration of the wheels of the vehicle during braking, comprising an element which provides a signal which is a function of the speed of each of the wheels; a shunt device receiving this signal; a diode which only passes deceleration signals connected to said shunt device; a threshold device connected to said diode for passing a control signal, means connected to said threshold device for receiving said control signal for controlling the disengagement of the brake from the corresponding wheel and operating on an all-or-nothing basis, in the case of exaggerated skidding; means including a second diode connected in parallel with the first diode and only passing acceleration signals therethrough, a memory, and a memory discharger connected in series; the signal derived from said shunting device being transmitted, during the subsequent acceleration stage of the wheel when the brake is released, through said second diode which only lets the acceleration signals pass therethrough, to said memory discharger which discharges said memory beyond a predetermined acceleration threshold in inverse proportion to the magnitude of acceleration; a charging resistor between the memory and said first diode such that the deceleration signal is passed to the memory through said charging resistor to obtain a charge which is proportional both to the value of the signal and its duration, said memory discharger including a transistor which operates on constant current, a resistor connecting the second diode to the emitter of said transistor, a resistance bridge connected to the base of the transistor for polarization thereof, said transistor being controlled by the magnitude of acceleration of the wheel when it is picking up speed, when beyond the threshold defined by the polarization of the base of said transistor, said threshold device comprising a comparator, one of the two inputs of which is polarized by a reference voltage, from a voltage-dividing bridge connected between ground and a constant voltage source, the other input of the comparator being connected to said first diode and the charging resistor.