초록 ▼

An anti-lock braking system (ABS) and traction control (TC) integration is provided including an actuator with fluid connections with a master cylinder, reservoir, and a wheel cylinder. A primary piston with an interior bore and a radial bore for selective alignment with the actuator fluid connectio

An anti-lock braking system (ABS) and traction control (TC) integration is provided including an actuator with fluid connections with a master cylinder, reservoir, and a wheel cylinder. A primary piston with an interior bore and a radial bore for selective alignment with the actuator fluid connections is slidably mounted in the actuator. A normally closed solenoid valve connects the reservoir with the actuator. A sensor determines wheel speed and generates a signal. The primary piston is moved along an actuator bore in response to the signal. The actuator also has a bore axial stop. A secondary piston is slidably mounted within the primary piston. The secondary piston has land surfaces forming a sealed chamber within the primary piston and a head section sealable mounted within the actuator bore exposed to the actuator connection with the wheel cylinder. The piston has an interior passage connecting the actuator connection with the wheel cylinder with the secondary piston sealed chamber.

대표청구항 ▼

An anti-lock braking system (ABS) and traction control (TC) integration for a vehicle with a master cylinder, a reservoir and a wheel brake cylinder, said integration in combination comprising: an actuator housing with an interior bore with a first fluid connection with said master cylinder, a secon

An anti-lock braking system (ABS) and traction control (TC) integration for a vehicle with a master cylinder, a reservoir and a wheel brake cylinder, said integration in combination comprising: an actuator housing with an interior bore with a first fluid connection with said master cylinder, a second fluid connection with said reservoir axially spaced from said first connection, and a third fluid connection with said wheel cylinder axially spaced from said second fluid connection; a primary piston slidably mounted in said housing with an interior bore and a radial bore intersecting said interior bore for selective alignment with said housing first or second fluid connections; first solenoid valve means normally open, said first solenoid valve means connecting said master cylinder with said wheel brake cylinder through a path independent of said actuator housing bore, and when energized said first solenoid valve means closes isolating said master cylinder from said wheel brake cylinder except through said actuator bore, and second solenoid valve means normally closed, said second solenoid valve means when energized to an open position connecting said reservoir with said housing second fluid connection; sensor/computer means to sense the wheel speed of said wheel and to generate a signal in response thereto; means to move said primary piston along said housing bore in response to said signal; means for providing an axial stop within said housing bore; and secondary piston means slidably mounted within said primary piston having first and second landings forming a sealed chamber within said primary piston and having a head section sealably mounted within said housing bore exposed to said housing third fluid connection and said secondary piston having an interior passage connecting said housing third fluid connection with said secondary piston sealed chamber whereby when said integration is in a normal braking mode said secondary piston is held against said stop means and said master cylinder fluidly communicates through said housing first fluid connection out through said housing third fluid connection to said wheel cylinder and in an ABS mode said first solenoid valve means is energized to isolate said master cylinder from said wheel brake cylinder and said second solenoid valve means is energized to connect said reservoir with said housing second fluid connection and said primary piston is displaced in a first axial direction to fluidly communicate said wheel cylinder with said reservoir to relieve the fluid pressure within said wheel cylinder and upon a signal given by said sensor/computer means, said primary piston is displaced further in said first axial direction to close fluid communication of said wheel cylinder with said reservoir and to contact said secondary piston and displace the same to reapply the pressure to said brake and whereby said primary piston is moved in a similar manner as aforedescribed when said integration is in a traction control mode.