Patent ID: 6715848
Filing Date: 2004-04-06
Classification: B60T

Abstract:
An hydraulic anti blocking anti-locking brake system for a motorcycle including a front wheel braking lever, a corresponding front wheel brake a rear wheel braking lever, and a corresponding rear wheel brake the system comprising:two hydraulic circuits, each hydraulic circuit being respectively installed between the front wheel lever and the front wheel brake and between the rear wheel lever and the rear wheel brake each hydraulic circuit comprising a pressure compartment with at least a piston, the piston being connected to one of the front or rear wheel braking levers, the pressure compartment having an oil outlet; a pressure increasing circuit, including an inlet terminal and an outlet terminal, the oil outlet of the pressure is compartment being connected to the inlet terminal of the pressure increasing circuit; a pressure releasing circuit, connected between the outlet terminal of the pressure increasing circuit at one end, and the oil outlet of the pressure compartment and the inlet terminal of the pressure increasing circuit at another end, the pressure releasing circuit being further connected to a motor; and an electric control unit, comprising a front wheel velocity sensor, a rear wheel velocity sensor, a slip rate calculator, a slip rate comparator, a front wheel controller and a rear wheel controller; wherein from the velocity values sensed by the front and rear wheel sensors, the slip rate calculator determines the velocity of the motorcycle and slip rates of the front and rears wheels; from a plurality of control zones of slip rate parameters established in the electric control unit, the slip rate comparator determines in which control zone the calculated slip rates of the front and rear wheels are located so as to output respective signals to the front and rear wheel controllers that consequently control operations of the motor, pressure increasing circuit, and pressure releasing circuit; via operation of the braking levers, an actuation of the piston is thereby activated to provide hydraulic pressure, and according to a variation of the calculated slip rates of the front and rear wheels, different signals are outputted to control the pressure increasing circuit and the pressure releasing circuit so as to adequately regulate the braking hydraulic pressure; the control zones include a first control zone, a second control zone, a third control zone, a fourth control zone, and a fifth control zone; the first control zone corresponding to a slip rate lower than about 0.1%, the second control zone corresponding to a slip rate between about 0.1% and 0.15%, the third control zone corresponding to a slip rate between about 0.15% and 0.25%, the fourth control zone corresponding to a slip rate between about 0.25% and 0.5%, and the fifth control zone corresponding to a slip rate higher than about 0.5% and being optimal.