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Title: Method of controlling automatic transmission in accordance with engine operation

Abstract

This patent describes a method of controlling a shifting operation of a synchromesh type automatic transmission coupled to an engine in a vehicle, comprising the steps of: (1) detecting a vehicle speed, an accelerator pedal position, a selected gear position and an engine torque; (2) determining an optimum gear position form a shift map based on the vehicle speed and the acceleration pedal position; (3) comparing the optimum gear position with the selected gear position; (4) determining if the engine torque is greater than or equal to a predetermined torque value, if the optimum gear position is greater than the selected gear position; (5) reducing the supply of fuel to an engine, if the engine torque determined in step (4) is greater than the predetermined torque value, to reduce the engine torque below the predetermined torque value; (6) releasing a clutch to disconnect the engine and the automatic transmission when the engine torque is less than the predetermined torque value; (7) shifting the automatic transmission to the optimum gear position; and (8) engaging the clutch.

Inventors:
; ; ;
Publication Date:
OSTI Identifier:
6232697
Patent Number(s):
US 4677880
Assignee:
Isuzu Motors Ltd., Tokyo and Fujitsu Ltd., Kawasaki
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 24 Dec 1984
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; ENGINES; CONTROL SYSTEMS; OPERATION; MECHANICAL TRANSMISSIONS; VEHICLES; GEARS; OPTIMIZATION; POSITIONING; SPEED REGULATORS; TORQUE; VELOCITY; CONTROL EQUIPMENT; EQUIPMENT; MACHINE PARTS; 330602* - Vehicle Design Factors- Engine-Transmission Matching

Citation Formats

Hattori, T, Uriuhara, M, Kasai, H, and Asagi, Y. Method of controlling automatic transmission in accordance with engine operation. United States: N. p., 1987. Web.
Hattori, T, Uriuhara, M, Kasai, H, & Asagi, Y. Method of controlling automatic transmission in accordance with engine operation. United States.
Hattori, T, Uriuhara, M, Kasai, H, and Asagi, Y. 1987. "Method of controlling automatic transmission in accordance with engine operation". United States.
@article{osti_6232697,
title = {Method of controlling automatic transmission in accordance with engine operation},
author = {Hattori, T and Uriuhara, M and Kasai, H and Asagi, Y},
abstractNote = {This patent describes a method of controlling a shifting operation of a synchromesh type automatic transmission coupled to an engine in a vehicle, comprising the steps of: (1) detecting a vehicle speed, an accelerator pedal position, a selected gear position and an engine torque; (2) determining an optimum gear position form a shift map based on the vehicle speed and the acceleration pedal position; (3) comparing the optimum gear position with the selected gear position; (4) determining if the engine torque is greater than or equal to a predetermined torque value, if the optimum gear position is greater than the selected gear position; (5) reducing the supply of fuel to an engine, if the engine torque determined in step (4) is greater than the predetermined torque value, to reduce the engine torque below the predetermined torque value; (6) releasing a clutch to disconnect the engine and the automatic transmission when the engine torque is less than the predetermined torque value; (7) shifting the automatic transmission to the optimum gear position; and (8) engaging the clutch.},
doi = {},
url = {https://www.osti.gov/biblio/6232697}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 07 00:00:00 EDT 1987},
month = {Tue Jul 07 00:00:00 EDT 1987}
}