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:
Feb. 28, 2012
Filed:
Oct. 26, 2009
Hirohito Ide, Wako, JP;
Hirohito Ide, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A control system for an internal combustion engine having a valve operating characteristic varying mechanism for continuously changing a lift amount of at least one intake valve of the engine. The valve operating characteristic varying mechanism includes a control shaft for changing the lift amount, a motor for rotating the control shaft, and a transmission mechanism provided between an output shaft of the motor and the control shaft for transmitting an actuating force of the motor to the control shaft. A first rotational angle sensor detects a rotational angle of the output shaft of the motor, and a second rotational angle sensor detects a rotational angle of the control shaft. A control of the lift amount of the at least one intake valve is performed according to the rotational angle detected by the first rotational angle sensor or the second rotational angle sensor. A failure diagnosis of the first rotational angle sensor, the second rotational angle sensor, and the transmission mechanism is performed based on the rotational angles detected by the first and second rotational angle sensors.