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:
Jul. 28, 1998
Filed:
Jan. 30, 1996
Shinya Kamada, Hiroshima, JP;
Kenji Sawa, Hiroshima, JP;
Hiroshi Shinozuka, Hiroshima, JP;
Tomoo Sawazaki, Higashihiroshima, JP;
Koichi Yamamoto, Hiroshima, JP;
Kazushi Kurokawa, Hiroshima, JP;
Takamichi Teraoka, Hiroshima, JP;
Masakazu Hombo, Hiroshima, JP;
Naotaka Hirami, Hiroshima, JP;
Yasunori Kanda, Higashihiroshima, JP;
Akinobu Aoki, Higashihiroshima, JP;
Tatsuhiko Iwasaki, Hiroshiman, JP;
Takeyoshi Kawa, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima-ken, JP;
Abstract
A control system for an automatic transmission having friction coupling elements, at least one of which is locked in 3rd and 4th gears and unlocked in 1st and 2nd gears, includes a first shift valve shiftable between 3rd and 4th gears, and second shift valve shiftable between in 2nd gear and 1st gear in which engine brake available, and a solenoid valve providing control pressure which is selectively directed to these shift valves and cause them to shift so as to lock or unlock the friction coupling elements.