Vehicle automatic transmission control system

Details Vehicle automatic transmission control system Vehicle automatic transmission control system

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 61/02 (2006.01) F16H 59/14 (2006.01) F16H 61/38 (2006.01) F16H 61/662 (2006.01) F16H 59/18 (2006.01) F16H 59/48 (2006.01) F16H 59/50 (2006.01) F16H 59/74 (2006.01) F16H 61/00 (2006.01)

Patent

CA 2077426

In a system for controlling a gear ratio of a multi-step geared or continuously variable automatic transmission of a vehicle based on determined parameter indicative of operating condition of the vehicle including a driving resistance, the driving resistance is calculated in an equation in which motive force - driving resistance = vehicle mass x acceleration using the law of motion. In the first embodiment, the calculation is carried out, without using a torque sensor, by applying an adjustment for torque consumption by a device such as an air conditioner and a torque loss caused by braking. In the second and third embodiments, the driving resistance is calculated using a torque sensor. Thus, with the arrangement, the driving resistance can be accurately determined applying appropriate adjustment, a gear ratio to be shifted is properly determined in any traveling condition including hill climbing.

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