Phaser mounted DPCS (differential pressure control system) to reduce axial length of the engine
Patent No. 6,883,475
Issued: April 26, 2005
Inventors: Simpson; Roger (Ithaca, NY)
An internal DPCS feeds (13) engine oil pressure (32) to one side (19) of the spool and a solenoid controlled pressure (14) to a piston (12) that has twice the area as that side (19) of the spool. The spool end (21) that is fed control pressure is preferably twice the area of the spool end (19) that is fed with engine oil pressure. A spring (18) mounted in the phaser pushes the spool (25) to the default position in case of solenoid failure. A PWM solenoid valve (15) or a proportional solenoid valve controls the oil flow to the large area end (21) of the spool (25). In a preferred embodiment of the invention, a position sensor (34) further controls the position of the spool valve (28).
This application claims an invention which was disclosed in Provisional Application No. 60/374,334, filed Apr. 22, 2002, entitled "PHASER MOUNTED DPCS (DIFFERENTIAL PRESSURE CONTROL SYSTEM) TO REDUCE AXIAL LENGTH OF THE ENGINE". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.
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