Load control for a machine with a dual path electronically controlled hydrostatic transmission
AssigneeCNH America LLC
InventorsKushan VORA, Joseph R. SHOEMAKER, David SCHULTE, Swapnil TANDEL
Life of this patent
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Abstract
A method of managing engine load by adjusting the pump and motor displacements of a dual path electronically controlled hydrostatic transmission utilizes the difference between the reference and actual engine speeds, the temperature of the working fluid for the dual path electronically controlled hydrostatic transmission, the engine governor droop value, the vehicle speed and lookup tables to determine pump and motor command adjustment factors associated with specific engine loading conditions.
Claims20
A method for controlling a machine with a dual path electronically controlled hydrostatic transmission, the method comprising:
- providing a machine having an engine and a dual path electronically controlled hydrostatic transmission, the hydrostatic transmission including an input device and a drive system, the drive system having at least one pump and at least one motor, the input device providing drive commands for the at least one pump and at least one motor of the drive system;
- modifying the drive commands for the at least one pump and the at least one motor of the drive system based on at least one measured machine operating parameter;
- and
- applying the modified drive commands to the at least one pump and the at least one motor of the drive system to prevent the engine from stalling.
A control system for a machine comprising:
- a first drive system comprising:
- a first forward pump solenoid;
- a first reverse pump solenoid;
- a first motor solenoid;
- a first pump controlled by the first forward pump solenoid and the first reverse pump solenoid;
- and
- a first motor controlled by the first motor solenoid and powered by the first pump;
- a second drive system comprising:
- a second forward pump solenoid;
- a second reverse pump solenoid;
- a second motor solenoid;
- a second pump controlled by the second forward pump solenoid and the second reverse pump solenoid;
- and
- a second motor controlled by the second motor solenoid and powered by the second pump;
- an operator input device, the operator input device generating a command to control the first drive system and the second drive system in response to user manipulation of the operator input device;
- and
- a control device to modify the first command and the second command based on at least one load control factor.
Dependencies are inferred from the claim text.