Phase angle detection apparatus and variable valve timing control apparatus using the phase angle detection apparatus for internal combustion engine

a phase angle detection and control apparatus technology, applied in mechanical devices, machines/engines, valve arrangements, etc., can solve the problems of difficult to precisely execute the phase control by only the cam angle and crank angle sensors, and difficult to detect the relative rotational phase difference by the cam angle sensor
US20070295295A1Inactive Publication Date: 2007-12-27HITACHI LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HITACHI LTD
Publication Date
2007-12-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

A phase angle detection apparatus includes an intermediate rotary member changing an operating angle of a driven member that is driven by a driving member, a detection unit detecting a rotational angle of the intermediate rotary member, which corresponds to the operating angle of the driven member, and outputting the rotational angle as a detection pulse signal, a controller receiving the detection pulse signal and calculating a pulse rising time difference between the detection pulse signal and a pre-set reference pulse signal. The controller detects, based on the pulse rising time difference, a predetermined middle angle position of the driven member from all the operating angles of the driven member.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a phase angle detection apparatus that detects a rotational phase difference between at least two rotary members, and more particularly to a phase angle detection apparatus which is used for a variable valve timing control apparatus of an internal combustion engine, which variably controls open / close timing of an intake-side or exhaust-side valve of the internal combustion engine according to an engine operating condition.

[0002] In recent years, there have been proposed and developed various variable valve timing control apparatuses. One such variable valve timing control apparatus has been disclosed in Japanese Patent Provisional Publication No. 2005-180307 (hereinafter is referred to as “JP2005-180307”) corresponding to U.S. Pat. No. 7,143,730 (B2).

[0003] The variable valve timing control apparatus disclosed in JP2005-180307 includes a timing sprocket to which a torque (turning force) is transferred from a crankshaft ...

Claims

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