초록 ▼

An anti-lock braking control system for use in vehicles contains a restrictive orifice associated with an attenuator in the master cylinder brake line and opposed, parallel check valves positioned parallel to and independent of the restrictive orifice, all of which is located at or upstream of the j

An anti-lock braking control system for use in vehicles contains a restrictive orifice associated with an attenuator in the master cylinder brake line and opposed, parallel check valves positioned parallel to and independent of the restrictive orifice, all of which is located at or upstream of the juncture of the pump outlet line, thus allowing high volume fluid flow to and from the master cylinder while providing high pressure pulse and vibration damping of the ABS/TCS pump and associated isolation valve, and isolating this from the master cylinder and from operator pedal feel. Preferably, the reduced size orifice comprises one or more grooves located in the conical seat of at least one and preferably both check valves, which are preferably of the check ball type. Alternatively, a traditional, generally circular cross-section restrictive orifice in parallel with the check valves, may be substituted for or used in conjunction with the aforementioned grooves or their equivalents.

대표청구항 ▼

A hydraulic circuit suitable for an anti-lock braking system, comprising: a brake pedal-actuated master cylinder for supplying pressurized fluid through a master cylinder line to at least one brake slave cylinders when actuated; a normally-open isolation valve through which said pressurized fluid fl

A hydraulic circuit suitable for an anti-lock braking system, comprising: a brake pedal-actuated master cylinder for supplying pressurized fluid through a master cylinder line to at least one brake slave cylinders when actuated; a normally-open isolation valve through which said pressurized fluid flows, said isolation valve located between said master cylinder and said slave cylinder and in fluid communication with each through said master cylinder line; a normally-closed hold/dump valve having an inlet and an outlet, the inlet communicating with said master cylinder line between said isolation valve and said slave cylinder, said hold/dump valve when open providing a means of escape of pressurized fluid from said slave cylinder when said isolation valve is closed; a high pressure pump having an inlet and an outlet and capable of supplying high pressure fluid through said pump outlet to a point in said circuit such that said isolation valve, when closed, prevents flow of high pressure fluid to said slave cylinder, said pump inlet communicating with said hold/dump valve outlet; an attenuator comprising a cavity containing a compressible substance, at least two inlet/outlet passages, and an orifice of reduced size relative to said inlet/outlet passages, said attenuator cavity being positioned in said circuit such that fluid to said slave cylinder from said high pressure pump and from said master cylinder must pass through said attenuator cavity, said orifice being positioned between said attenuator cavity and said master cylinder such that the high rise in fluid pressure caused by the operation of said high pressure pump is reduced in amplitude by said attenuator in combination with said orifice.