Power braking system with steering assist
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United States of America Patent
Stats
-
Mar 17, 2015
Grant Date -
May 23, 2013
app pub date -
Nov 29, 2010
filing date -
Dec 8, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vehicle power braking system has separate left and right brakes (11, 12) operable from a source of pressurized fluid (13) via relay valve means (16) controlled by separate left and right brake operating pedals (14, 15) to provide steering assistance during a turn. The relay valve means delivers a brake operating pressure proportional to the depression of the associated brake operating pedal to separate left and right shift valves (17, 18), each shift valve being connected with its respective operating pedal (14, 15) by a respective pilot line (19, 20) so that when each pedal is operated the associated shift valve is opened by the respective pilot line pressure to supply the proportional pressure from the relay valve means to the respective brake (11, 12). The relay valve means comprises a single relay valve (16) which supplies both shift valves (17, 18) and the pilot lines (19, 20) are interconnected via a shuttle valve (21, 22) so that the highest pilot pressure generated by operating the brake pedals (14, 15) is applied to the single relay valve (16) so that each shift valve receives the same brake applying pressure proportional to said highest pilot pressure.
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