Fluid-pressure and analogous brake systems – Speed-controlled – Odd condition or device detection
Reexamination Certificate
2006-10-24
2006-10-24
Williams, Thomas J. (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Odd condition or device detection
C303S119200
Reexamination Certificate
active
07125087
ABSTRACT:
A brake fluid pressure retaining unit is provided which allows a relief pressure to be variable only by use of a low-cost electromagnetic valve without using an expensive relief valve and orifice. The brake fluid pressure retaining unit includes an electromagnetic valve which is provided midway in a brake fluid channel connecting a master cylinder and a wheel cylinder and is capable of freely opening/closing the brake fluid channel by passing current though a solenoid coil; and an electromagnetic valve control section which detects a release signal indicative of releasing brake operation detected by a brake operation detecting section and passes current through the solenoid coil while referring to current values corresponding to a target maintaining fluid pressure to maintain a predetermined braking force. The electromagnetic valve control section determines in advance a predetermined opening-side current value required to switch the electromagnetic valve from a closed state to an open state and a predetermined closing-side current value required to switch the electromagnetic valve from an open state to a closed state, for each target maintaining fluid pressure, and performs control so that the value of the current to be passed through the solenoid coil is in a range between the predetermined opening-side current value and predetermined closing-side current value.
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JPB No. 3-8981, published Feb. 7, 1999, corresponds to JPA No. 60-128051, published Jul. 8, 1985 with Abstract.
JPB No. 3-42225, published Jun. 26, 1991, corresponds to JPA No. 60-128052, published Jul. 8, 1985 with Abstract.
Sughrue & Mion, PLLC
Transtron Inc.
Williams Thomas J.
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