Method of controlling automatic transmission
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
- Resource Relation:
- Patent File Date: Filed date 24 Dec 1984
- Country of Publication:
- United States
- Language:
- English
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