Patent ID: 6679806
Filing Date: 2004-01-20
Classification: F16H,Y10T

Abstract:
A system for changing the gear ratios in a transmission portion of an engine, the transmission driving an oil well stimulation pump, said system comprising:a rotational speed sensor for determining the rotational speed of an output shaft of the transmission; means for calculating a desired rotational speed for the engine using the output of said rotational speed sensor; means for using said desired rotational speed of the engine to regulate the actual rotational speed of the engine; means for causing the transmission to enter a torque converter mode; means for changing the gear ratios in the transmission; means for causing the transmission to enter a lockup mode; whereby when it is desired to actuate said means for changing the gear ratios in the transmission, said means for causing the transmission to enter the torque converter mode is activated, then the rotational speed of the engine is adjusted to said desired engine speed, and thereafter said means for causing the transmission to enter the lockup mode is activated.