Work vehicle and control method for same
First Claim
Patent Images
1. A work vehicle, comprising:
- an engine;
a hydraulic pump driven by the engine;
a work implement driven by hydraulic fluid discharged from the hydraulic pump;
a work implement operating member for operating the work implement;
a pressure sensor for detecting a hydraulic pressure of the hydraulic pump;
a travel device driven by the engine;
a power-transmission device configured to transmit driving power from the engine to the travel device;
a vehicle speed detecting unit for detecting a vehicle speed;
an accelerator operating member;
an accelerator operation detecting unit for detecting an operation amount of the accelerator operating member; and
a control unit configured to control the power-transmission device;
the power-transmission device includingan input shaft;
an output shaft;
a gear mechanism including a planetary gear mechanism, the gear mechanism being configured to transmit rotation of the input shaft to the output shaft;
a motor connected to a rotating element of the planetary gear mechanism; and
an energy reservoir unit for storing energy generated in the motor; and
the power-transmission device configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing the rotation speed of the motor, andthe control unit includinga work implement requirement determination unit for determining a work implement required horsepower on the basis of the operation amount of the work implement operating member and the hydraulic pressure of the hydraulic pump;
a transmission requirement determination unit for determining a transmission required horsepower on the basis of the vehicle speed and the operation amount of the accelerator operating member;
an engine requirement determination unit for determining an engine required horsepower on the basis of the work implement required horsepower and the transmission required horsepower;
a required throttle determination unit for determining a required throttle value based on the engine required horsepower;
an energy management requirement determination unit for determining an energy management required horsepower on the basis of a remaining amount of energy in the energy reservoir unit;
a distribution ratio determination unit for determining a transmission output ratio, dividing the work implement required horsepower and the transmission required horsepower into respective priority portions and respective ratio portions, prioritizing the priority portions of the work implement required horsepower and the transmission required horsepower over the ratio portions of the work implement required horsepower and the transmission required horsepower, and maintaining the priority portions of the work implement required horsepower and the transmission required horsepower and decreasing the ratio portions of the work implement required horsepower and the transmission required horsepower when the sum of the work implement required horsepower, the transmission required horsepower and the energy management required horsepower is greater than a predetermined load upper limit horsepower; and
the distribution ratio determination unit prioritizing the energy management required horsepower over the priority portions of the work implement required horsepower and the transmission required horsepower.
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Accused Products
Abstract
The work implement requirement determination unit determines a work implement required horsepower on the basis of an operation amount of a work implement operating member and a hydraulic pressure of a hydraulic pump. A transmission requirement determination unit determines a transmission required horsepower on the basis of a vehicle speed and the operation amount of the accelerator operating member. An engine requirement determination unit determines an engine required horsepower on the basis of the work implement required horsepower and the transmission required horsepower. The required throttle determination unit determines a required throttle value based on an engine requirement.
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Citations
15 Claims
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1. A work vehicle, comprising:
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an engine; a hydraulic pump driven by the engine; a work implement driven by hydraulic fluid discharged from the hydraulic pump; a work implement operating member for operating the work implement; a pressure sensor for detecting a hydraulic pressure of the hydraulic pump; a travel device driven by the engine; a power-transmission device configured to transmit driving power from the engine to the travel device; a vehicle speed detecting unit for detecting a vehicle speed; an accelerator operating member; an accelerator operation detecting unit for detecting an operation amount of the accelerator operating member; and a control unit configured to control the power-transmission device; the power-transmission device including an input shaft; an output shaft; a gear mechanism including a planetary gear mechanism, the gear mechanism being configured to transmit rotation of the input shaft to the output shaft; a motor connected to a rotating element of the planetary gear mechanism; and an energy reservoir unit for storing energy generated in the motor; and the power-transmission device configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing the rotation speed of the motor, and the control unit including a work implement requirement determination unit for determining a work implement required horsepower on the basis of the operation amount of the work implement operating member and the hydraulic pressure of the hydraulic pump; a transmission requirement determination unit for determining a transmission required horsepower on the basis of the vehicle speed and the operation amount of the accelerator operating member; an engine requirement determination unit for determining an engine required horsepower on the basis of the work implement required horsepower and the transmission required horsepower; a required throttle determination unit for determining a required throttle value based on the engine required horsepower; an energy management requirement determination unit for determining an energy management required horsepower on the basis of a remaining amount of energy in the energy reservoir unit; a distribution ratio determination unit for determining a transmission output ratio, dividing the work implement required horsepower and the transmission required horsepower into respective priority portions and respective ratio portions, prioritizing the priority portions of the work implement required horsepower and the transmission required horsepower over the ratio portions of the work implement required horsepower and the transmission required horsepower, and maintaining the priority portions of the work implement required horsepower and the transmission required horsepower and decreasing the ratio portions of the work implement required horsepower and the transmission required horsepower when the sum of the work implement required horsepower, the transmission required horsepower and the energy management required horsepower is greater than a predetermined load upper limit horsepower; and the distribution ratio determination unit prioritizing the energy management required horsepower over the priority portions of the work implement required horsepower and the transmission required horsepower. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for controlling a work vehicle, the work vehicle comprising:
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a power-transmission device having an input shaft, an output shaft, a gear mechanism including a planetary gear mechanism, the gear mechanism being configured to transmit rotation of the input shaft to the output shaft, a motor connected to a rotating element of the planetary gear mechanism, and an energy reservoir unit for storing energy generated in the motor, the power-transmission device configured to change a rotation speed ratio of the output shaft with respect to the input shaft by changing the rotation speed of the motor; the method comprising; a step for detecting an operation amount of a work implement operating member; a step for detecting a hydraulic pressure of a hydraulic pump for driving the work implement; a step for detecting a vehicle speed; a step for detecting an operation amount of an accelerator operating member; a step for determining a work implement required horsepower on the basis of an operation amount of the work implement operating member and the hydraulic pressure; a step for determining a transmission required horsepower on the basis of the vehicle speed and the operation amount of the accelerator operating member; a step for determining an engine required horsepower on the basis of the work implement required horsepower and the transmission required horsepower; a step for determining a required throttle value based on the engine required horsepower; a step for determining an energy management required horsepower on the basis of a remaining amount of energy in the energy reservoir unit; a step for dividing the work implement required horsepower and the transmission required horsepower into respective priority portions and respective ratio portions; a step for prioritizing the energy management required horsepower over the priority portions of the work implement required horsepower and the transmission required horsepower; a step for prioritizing the priority portions of the work implement required horsepower and the transmission required horsepower over the ratio portions of the work implement required horsepower and the transmission required horsepower; and a step for maintaining the priority portions of the work implement required horsepower and the transmission required horsepower and decreasing the ratio portions of the work implement required horsepower and the transmission required horsepower when the sum of the work implement required horsepower, the transmission required horsepower and the energy management required horsepower is greater than a predetermined load upper limit horsepower.
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Specification