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Title: Electronically controlled automatic transmission

This patent describes an electronically controlled automatic transmission having a manual valve working in connection with a manual shift lever, shift valves operated by solenoid valves which are driven by an electronic control circuit previously memorizing shift patterns, and a hydraulic circuit controlled by these manual valve and shift valves for driving brakes and a clutch in order to change speed. Shift patterns of 2-range and L-range, in addition to a shift pattern of D-range, are memorized previously in the electronic control circuit, an operation switch is provided which changes the shift pattern of the electronic control circuit to any shift pattern among those of D-range, 2-range and L-range at time of the manual shift lever being in a D-range position, a releasable lock mechanism is provided which prevents the manual shift lever from entering 2-range and L-range positions, and the hydraulic circuit is set to a third speed mode when the manual shift lever is in the D-range position. The circuit is set to a second speed mode when it is in the 2-range position, and the circuit is set to a first speed mode when it is in the L-range position, respectively, in case where the shift valvesmore » are not working.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
5934478
Report Number(s):
US 4815341
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 29 Apr 1988
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; MECHANICAL TRANSMISSIONS; COMPUTERIZED CONTROL SYSTEMS; AUTOMATION; DESIGN; ELECTRONIC EQUIPMENT; OPERATION; VALVES; CONTROL EQUIPMENT; CONTROL SYSTEMS; EQUIPMENT; FLOW REGULATORS; MACHINE PARTS 330602* -- Vehicle Design Factors-- Engine-Transmission Matching; 990220 -- Computers, Computerized Models, & Computer Programs-- (1987-1989)