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:
Aug. 11, 2009
Filed:
Aug. 13, 2004
Shinya Sato, Hitachinaka, JP;
Shinji Nakagawa, Hitachinaka, JP;
Hiromu Kakuya, Hitachi, JP;
Toshimichi Minowa, Mito, JP;
Mamoru Nemoto, Hitachiota, JP;
Shinya Sato, Hitachinaka, JP;
Shinji Nakagawa, Hitachinaka, JP;
Hiromu Kakuya, Hitachi, JP;
Toshimichi Minowa, Mito, JP;
Mamoru Nemoto, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When a throttle is fully open, a maximum torque set value is corrected based on the ratio between the maximum air volume set value under fully-open throttle conditions and the actual maximum air volume detected by an intake air volume meter such as an air flow sensor. Based on the corrected maximum torque set value, both the relation between the degree of accelerator opening and target torque and the relation between the target torque (target air volume) and the degree target throttle opening are corrected. Thus, even when various types of disturbances relating to torque error are generated, such as variations in air density generated in association with variations in temperature or altitude, variations over time such as contaminations of throttle chambers, or difference between machines such as engine bodies or auxiliary machines, it is possible to generate actual torque with respect to a target torque with a high degree of accuracy, while maintaining a desired relation between the degree of accelerator opening and the throttle opening.