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:
Sep. 24, 1991
Filed:
Mar. 29, 1990
Takashi Shibayama, Isehara, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A lock-up control in a motor vehicle includes a lock-up control solenoid for engaging a lock-up clutch in a torque converter. A hydraulic fluid temperature of hydraulic fluid used in the torque converter and also in the associated automatic transmission is detected. When the fluid temperature becomes higher than a predetermined temperature value, for example 120.degree. C. in the embodiment, a different lock-up shift point mapping is set which defines a lock-up range stretching beyond a predetermined gear position to include a gear position lower than the predetermined gear position. Thus, the lock-up range where the lock-up clutch should be engaged stretches, rendering the torque converter to stop stirring the hydraulic fluid therein when the fluid temperature is higher than the predetermined temperature value, effectively preventing further rise in the fluid temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile