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1. (WO2013148921) TRANSMISSION CONTROL SYSTEM

Pub. No.:    WO/2013/148921    International Application No.:    PCT/US2013/034228
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Fri Mar 29 00:59:59 CET 2013
IPC: F16H 59/14
F16H 59/36
F16H 61/02
F16H 61/38
Applicants: CATERPILLAR INC.
Inventors: LI, Wei
ANDERSON, Randall, Todd
HOFF, Brian, Douglas
Title: TRANSMISSION CONTROL SYSTEM
Abstract:
A method of controlling a transmission (11) associated with a machine includes determining a first target torque of the transmission (11). The first target torque includes a combination of a torque limit associated with a power source (17) of the machine and a virtual retarding torque. The method also includes directing the transmission (11) to generate a first output corresponding to the first target torque at an interface between the transmission (11) and the power source (17). The first output of the transmission (11) increases a speed of the power source (17) from a first power source speed to a second power source speed and decreases a travel speed of the machine from a first travel speed to a second travel speed. The method further includes determining that the first target torque is not equal to the torque limit, and determining a second target torque of the transmission (11) in response to determining that the first target torque is not equal to the torque limit. The second target torque is less than the first target torque.