Importance

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Abstract

A drum drive system includes a control system configured to control a prime mover, a variable displacement pump mechanically coupled to the prime mover, and a variable displacement motor fluidly coupled to the variable displacement pump. The control system has programmed instructions to operate the prime mover, the variable displacement motor, and the variable displacement pump to drive a drum of the vehicle; acquire pressure data indicative of a pressure of a fluid flowing between the variable displacement pump and the variable displacement motor; and in response to the pressure of the fluid being below a threshold pressure and while maintaining a drum speed of the drum: increase a pump displacement of the variable displacement pump, reduce a speed of the prime mover, and reduce a motor displacement of the variable displacement motor.

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First Claim