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. 02, 1997
Filed:
Dec. 27, 1995
Jaeduk Jang, Kyungki-do, KR;
Hyundai Motor Company, , KR;
Abstract
If there is a need to accelerate abruptly, or shift a speed stage from a fourth speed stage to a second speed stage, to accomplish a skip shift from the fourth speed stage to the second speed stage without going via a third speed stage and, therefore, enhance the shift-responsiveness and the power performance, a high-low pressure valve which is connected to a fourth friction pressure line in the third and fourth speed stages is duty controlled by a damper clutch solenoid valve to vary a line pressure in a pressure regulating valve with the operation of a damper clutch, and a shift valve is controlled to a drive pressure passage and a third speed line pressure by controlling a first and second pressure control solenoid valves to enable the skip shift, and by supplying a first friction element with the operation pressure at times of the second to the third speed stage shifting, after the shifting to the third speed stage, when the operation pressure for the fourth friction element is supplied to a releasing valve for the fourth friction element, the operation pressure of the first friction element is exhausted.