US 7,527,025 B2
Internal combustion engine variable compression ratio system
Mitsuo Kadota, Wako (Japan); and Kensaku Yamamoto, Wako (Japan)
Assigned to Honda Motor Co., Ltd., Tokyo (Japan)
Filed on Jul. 09, 2007, as Appl. No. 11/822,744.
Claims priority of application No. 2006-189447 (JP), filed on Jul. 10, 2006.
Prior Publication US 2008/0006230 A1, Jan. 10, 2008
Int. Cl. F02B 75/04 (2006.01)
U.S. Cl. 123—48R  [123/78 B] 9 Claims
OG exemplary drawing
 
1. An internal combustion engine variable compression ratio system, in which a compression ratio of an internal combustion engine is changed over between a high compression ratio and a low compression ratio with a changeover threshold value corresponding to a predetermined operational condition of the internal combustion engine being a boundary,
wherein the system comprises means for holding a changed-over state for a predetermined period of time after a first changeover of compression ratio is performed when the internal combustion engine enters a slow acceleration or deceleration state.