Method of controlling automatic transmission in accordance with determination of optimum gear ratio

Patent · Tue Feb 17 04:00:00 EST 1987

OSTI ID:6733180

Hattori, T; Uriuhara, M; Kasai, H; Asagi, Y; Ogawa, N

A method is described of controlling the gear changing operation in an automatic transmission having a gear transmission, a gear changing actuator assembly for changing gears in the gear transmission, a vehicle speed sensor for detecting a vehicle speed, an accelerator pedal, and an accelerator pedal sensor for detecting the extent of depression of the accelerator pedal. The automatic transmission also has an electronic control system responsive to signals from the vehicle speed sensor and the accelerator pedal sensor for determining an optimum gear position and controlling the gear changing actuator assembly to operate the gear transmission to select the optimum gear position. The method comprises: (a) detecting an extent of depression of the accelerator pedal from the accelerator pedal sensor, and a vehicle speed from the vehicle speed sensor; (b) determining an optimum gear position based on the extent of depression of the accelerator pedal and the vehicle speed; and (c) controlling the gear changing actuator assembly to operate the gear transmission to select a neutral position, for interrupting gear changing operation until the accelerator pedal is depressed, when the determined optimum gear position is lower than a currently selected gear position and when the extent of depression of the accelerator pedal is zero.

• Assignee: Isuzu Motors, Ltd., Tokyo
• Patent Number(s): US 4643048
• OSTI ID: 6733180
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
ACCELERATION
ACTUATORS
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
EQUIPMENT
GEARS
MACHINE PARTS
MEASURING INSTRUMENTS
MECHANICAL TRANSMISSIONS
OPTIMIZATION
POSITIONING
SPEED REGULATORS
VEHICLES
VELOCIMETERS