Variable compression ratio piston system

Patent No. 9,845,738

Issued: December 19, 2017
Filed: December 4, 2013 
PCT No.: PCT/US2013/073023 
371(c)(1),(2),(4) Date: June 18, 2015 
PCT Pub. No.: WO2014/099374 
PCT Pub. Date: June 26, 2014
Term Extension: 220 days

Inventor: Pluta; Christopher J. (Lansing, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

The variable compression ratio piston system for an engine adjusts the compression ratio of the engine piston by way of hydraulic fluid distributed between a pair of chambers formed in a pair of bores receiving control pistons mechanically coupled to the engine piston. A control valve selectively permits flow of hydraulic fluid between the high compression ratio line and the low compression ratio line. A variable force solenoid controlled by an engine control unit preferably controls the position of the control valve. The position of the spool controls whether hydraulic fluid can flow toward the first chamber, toward the second chamber, or not at all. Flow of hydraulic fluid is actuated by alternating forces from inertial and combustion forces on a crankshaft from operation of the engine.

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