Method of controlling automatic transmission

Patent · Tue Aug 04 04:00:00 EDT 1987

OSTI ID:6043385

Hattori, T; Uchiyama, N; Asagi, Y; Ogawa, N; Kasai, H

This patent describes a method of controlling a synchromesh type automatic transmission in a vehicle having an engine and a clutch, comprising the steps of: (a) releasing the clutch in response to a speed change command; (b) shifting the transmission from a former speed position to neutral; (c) multiplying a first value corresponding to the speed of the vehicle by a reduction ratio corresponding to a subsequent speed position; (d) detecting a synchronization load in accordance with the difference between the product of the first value and the reduction ratio and a second value corresponding to the r.p.m. of the engine; (e) comparing the detected synchronization load with a predetermined synchronization load, and controlling the r.p.m. of the input shaft of the transmission by engaging the clutch while the transmission is in neutral until the detected synchronization load is less than the predetermined synchronization load and then releasing the clutch; (f) shifting the transmission from neutral to a subsequent speed position; and (g) applying the clutch.

• Assignee: Isuzu Motors Limited, Tokyo and Fujitsu Limited, Kawasaki
• Patent Number(s): US 4683996
• OSTI ID: 6043385
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ENGINES
EQUIPMENT
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MOTION
ROTATION
SPEED REGULATORS
SYNCHRONIZATION
VEHICLES
VELOCITY