F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 59/66 (2006.01) F16H 61/02 (2006.01) F16H 59/14 (2006.01) F16H 59/24 (2006.01) F16H 59/36 (2006.01) F16H 59/40 (2006.01) F16H 59/42 (2006.01) F16H 59/48 (2006.01)
Patent
CA 2134797
A method and apparatus for selecting gear shift points is disclosed wherein vehicle speed and grade are monitored by sensors which provide data which is used to calculate vehicle acceleration adjusted to compensate for the effect of vehicle grade. A gross vehicle weight value is determined from the adjusted acceleration value. Based on the determined gross vehicle weight and the existing grade, the horse power required to sustain the current GVW and grade with zero acceleration is calculated. Also the current GVW and grade are used to determine the rate of vehicle speed loss during the torque interrupt period in order to predict the engine speed in the new gear and calculate the horse power available from the engine at shift completion. If the predicted engine speed is above a predetermined minimum and if the horse power available from the engine at completion of the shift is equal to or greater than the horse power required to maintain the current vehicle speed, the shift is permitted, otherwise the shift is not permitted and the measurements end calculations necessary to make the shift point decision are repeated. The minimum predicted engine speed may be adjusted to reflect driver demand as represented by throttle position.
Borden Ladner Gervais Llp
Corporation Eaton
LandOfFree
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