Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-04-06
1993-05-04
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031132, B60T 858
Patent
active
052074889
ABSTRACT:
A vehicle braking actuated traction control system is provided which includes a bored frame fluidly connected with a master cylinder and a wheel brake. A spring biased plunger with a sealing head slidably mounted within the bore isolates the bore from the master cylinder by axial movement of the plunger in a first direction. A piston operatively associated with the plunger is sealably slidably mounted within the bore for creating a variable control volume in the bore in fluid communication with the wheel brake. The piston is connected with the plunger via a spring which biases the plunger away from the piston. A nut is fixably connected with the piston and a drive screw threadably engaged with the piston is reversibly powered by an electric motor which is responsive to the signals given by a controller which is cognizant of a vehicle wheel condition. Upon the appropriate signal the drive screw will power the piston to a position to cause the plunger to isolate the wheel brake from the master cylinder and thereafter modulate the pressure within the wheel brake as commanded by the controller during a traction control cycle.
REFERENCES:
patent: 4571010 (1986-02-01), Dittner et al.
patent: 4938543 (1990-07-01), Parker et al.
patent: 5042885 (1991-08-01), Villec
patent: 5163744 (1992-11-01), Tierney et al.
Flory Donald M.
Haerr Timothy A.
Newton Jerry L.
Parker Donald L.
Butler Douglas C.
General Motors Corporation
Helms Ernest E.
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