US 7,320,216 B2
Hydraulic system having pressure compensated bypass
Michael T. VerKuilen, Metamora, Ill. (US); and Aleksandar M. Egelja, Naperville, Ill. (US)
Assigned to Caterpillar Inc., Peoria, Ill. (US); and Shin Caterpillar Mitsubishi Ltd, (Japan)
Filed on Oct. 31, 2005, as Appl. No. 11/261,539.
Prior Publication US 2007/0095059 A1, May 03, 2007
Int. Cl. F16D 31/02 (2006.01)
U.S. Cl. 60—421  [91/361] 21 Claims
OG exemplary drawing
 
1. A hydraulic system comprising:
a first source of pressurized fluid;
at least one fluid actuator; and
a first valve disposed between the first source and the at least one fluid actuator being configured to selectively communicate pressurized fluid from the first source to a source of low pressure; and
a controller configured to:
determine a first amount of displacement of the first valve,
determine a second amount of displacement of the first valve, and
modify the first amount of displacement as a function of the second amount of displacement and communicate a signal indicative of the modified first amount of displacement to the first valve to affect movement of the first valve without communicating signals indicative of the first or second amounts of displacement to the first valve when a first pressure is less than or equal to a pressure of pressurized fluid acting on the at least one fluid actuator.