Electronically controlled automatic transmission

Patent · Tue Mar 28 00:00:00 EST 1989

OSTI ID:5934478

Ohkubo, M; Shiba, H; Nakamura, K

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 valves are not working.

• Assignee: Kabushiki Kaisha Daikin Seisakusho, Osaka
• Patent Number(s): US 4815341
• OSTI ID: 5934478
• Resource Relation: Patent File Date: Filed date 29 Apr 1988
• Country of Publication: United States
• Language: English

Related Subjects

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)