Device and method for controlling an electrohydraulic transmission
AssigneePoclain Hydraulics Industrie
InventorLoris TAXIL
Life of this patent
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Abstract
A propulsion system for vehicle propulsion component having a variable displacement hydraulic pump, a hydraulic motor, adapted to drive the rotation of the propulsion component, an electric motor, adapted to drive the hydraulic pump, a source of electric power, and a controller configured, as a function of a setpoint value, to control the displacement of the hydraulic pump and the rotational speed of the electric motor so as to achieve the setpoint value while maintaining a rotational speed of the electric motor greater than a lower threshold value.
Claims21
A propulsion system for vehicle propulsion component,
- comprising:
- a variable displacement hydraulic pump,
- a hydraulic motor, adapted to drive the rotation of said propulsion component, the hydraulic motor being driven by the hydraulic pump via a closed-loop hydraulic circuit,
- an electric motor, adapted to drive the hydraulic pump,
- a source of electric power, adapted to feed the electric motor, a controller configured so as to, as a function of a setpoint value, control the displacement of the hydraulic pump and the rotational speed of the electric motor so as to achieve the setpoint value while maintaining a rotational speed of the electric motor greater than a lower threshold value, the rotational speed of the electric motor being controlled between the lower threshold value and a maximal rotational speed, and the displacement of the hydraulic pump being controlled in a range of displacement values between a lower threshold value and a maximum displacement value.
A control process of a propulsion system for a vehicle propulsion component, said propulsion system comprising:
- a variable displacement hydraulic pump
- a hydraulic motor, adapted to drive the rotation of said propulsion component, the hydraulic motor being driven by the hydraulic pump via a closed-loop hydraulic circuit,
- an electric motor, adapted to drive the hydraulic pump,
- a source of electric power, adapted to feed the electric motor,
- wherein in that as a function of a setpoint value, the displacement of the hydraulic pump and the rotational speed of the electric motor are controlled so as to achieve the setpoint value while maintaining a rotational speed of the electric motor greater than a lower threshold value, the rotational speed of the electric motor being controlled between the lower threshold value and a maximal rotational speed, and the displacement of the hydraulic pump being controlled in a range of displacement values between a lower threshold value and a maximum displacement value.
Dependencies are inferred from the claim text.