The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2025
Filed:
Feb. 21, 2022
Hitachi Astemo, Ltd., Hitachinaka, JP;
Yuya Shinozaki, Hitachinaka, JP;
Akira Kiyomura, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
A control device for a variable compression ratio mechanism for changing a compression ratio of an internal combustion engine by rotating a control shaft connected to an output shaft of an actuator, wherein with respect to a reference position, the control device determines the rotation angle of the control shaft by sequentially integrating the output values of an angle sensor that detects the rotation angle of the output shaft of the actuator in a range of 0° to 360° such that the rotation angle approaches a target angle. When the internal combustion engine is stopped, the control device rotates the control shaft to a high-compression-ratio side and a low-compression-ratio side, respectively, toward a stopper mechanism that defines the rotatable range and compares the determined rotation angle and a reference operation angle to diagnose whether a failure has occurred in the variable compression ratio mechanism.