Electrohydraulic device for closed-loop driving the control jack of a variable compression ratio engine
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United States of America Patent
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Nov 4, 2014
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app pub date -
Apr 16, 2008
filing date -
Apr 16, 2007
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Abstract
An electrohydraulic device for controlling the compression ratio of a variable compression-ratio engine, includes at least one dual-flow electrovalve (81) with no check valve and capable of opening and closing at least one hydraulic fluid duct (83) between the upper chamber (121) and the lower chamber (122) of a control jack (8), at least one position sensor (82) of a control rack (7), an angular position sensor (88) of the crankshaft (9) of the engine for adjusting the compression ratio, and at least one calculator (84).
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