Provided is a timing adjustment system having improved control for achieving a target rotational phase. The valve timing adjustment system includes a displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft of an internal combustion engine; a locking mechanism unit that locks the rotational phase at an intermediate locked phase positioned within a displacement range of the rotational phase; a hydraulic pathway that hydraulically drives the displacement mechanism unit and the locking mechanism unit; and a control unit including a control system that controls operations of the hydraulic control valve. The control unit changes a temporal responsiveness of the control system based on a displacement force that displaces the rotational phase.

Claims

20 · 1 independent · depth 4

20 granted claims

›1.independentA valve timing adjustment system comprising:na displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft of…+19

›2.↳ 1The valve timing adjustment system according to claim 1,nwherein the control unit switches the temporal responsiveness of the control system between a…d2+7

›3.↳ 2The valve timing adjustment system according to claim 2,nwherein the temporal responsiveness is changed so that the temporal responsiveness in the adv…d3+3

›6.↳ 2The valve timing adjustment system according to claim 2,nwherein a property obtainment unit that obtains property information regarding hydraulic prop…d3

›7.↳ 2The valve timing adjustment system according to claim 2,nwherein the control unit includes an oil degradation degree evaluation unit that evaluates a …d3

›8.↳ 2The valve timing adjustment system according to claim 2,nwherein the control system is a feedback control system that brings an actual value of the ro…d3

›10.↳ 1The valve timing adjustment system according to claim 1,nwherein a property obtainment unit that obtains property information regarding hydraulic prop…d2+5

›11.↳ 10The valve timing adjustment system according to claim 10,nwherein the property information includes at least one of an oil temperature, an oil pressur…d3+2

›14.↳ 10The valve timing adjustment system according to claim 10,nwherein the control unit includes an oil degradation degree evaluation unit that evaluates a…d3

›15.↳ 10The valve timing adjustment system according to claim 10,nwherein the control system is a feedback control system that brings an actual value of the r…d3

›16.↳ 1The valve timing adjustment system according to claim 1,nwherein the control unit includes an oil degradation degree evaluation unit that evaluates a …d2+3

›20.↳ 1The valve timing adjustment system according to claim 1,nwherein the control system is a feedback control system that brings an actual value of the ro…d2

Classifications

6 codes

IPC · International Patent Classification

Section F — Mechanical engineering; lighting; heating; weapons

F01L1/047
F02D13/02
F01L1/356
F01L1/34
F01L1/344

USPC · US Patent Classification

123/90.17

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Pendency

2.6 y

957 days filing → grant

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Daniel Bernstein

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20140216377 A1	7 Aug 2014

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