Construction vehicle
First Claim
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1. A construction vehicle comprising:
- an engine;
a hydraulic pump for travelling configured to be driven by the engine;
an accelerator pedal configured to adjust an acceleration opening degree in accordance with a pressed amount thereof;
a hydraulic motor for travelling configured to be driven by a pressurized oil discharged from the hydraulic pump for travelling;
a travelling load detecting section configured to detect a magnitude of a travelling load applied in travelling;
a vehicle speed detecting section configured to detect a vehicle speed; and
a control unit configured to set an upper limit of a command value of the acceleration opening degree in accordance with the magnitude of the travelling load and a magnitude of the vehicle speed, the control unit being further configured to set a lower limit of a displacement of the hydraulic motor for travelling in order to maximize the vehicle speed at the acceleration opening degree limited to a predetermined amount.
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Abstract
A construction vehicle includes a hydraulic pump for travelling driven by an engine and a hydraulic motor for travelling driven by a pressurized oil discharged from the hydraulic pump. A control unit is configured to set an upper limit of a command value of an acceleration opening degree in accordance with a magnitude of a travelling load and a magnitude of a vehicle speed, and to set a lower limit of a displacement of the hydraulic motor for travelling in order to maximize the vehicle speed at the acceleration opening degree limited to a predetermined amount.
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Citations
9 Claims
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1. A construction vehicle comprising:
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an engine; a hydraulic pump for travelling configured to be driven by the engine; an accelerator pedal configured to adjust an acceleration opening degree in accordance with a pressed amount thereof; a hydraulic motor for travelling configured to be driven by a pressurized oil discharged from the hydraulic pump for travelling; a travelling load detecting section configured to detect a magnitude of a travelling load applied in travelling; a vehicle speed detecting section configured to detect a vehicle speed; and a control unit configured to set an upper limit of a command value of the acceleration opening degree in accordance with the magnitude of the travelling load and a magnitude of the vehicle speed, the control unit being further configured to set a lower limit of a displacement of the hydraulic motor for travelling in order to maximize the vehicle speed at the acceleration opening degree limited to a predetermined amount. - View Dependent Claims (4, 5, 6)
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2. A construction vehicle comprising:
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an engine; a hydraulic pump for travelling configured to be driven by the engine; an accelerator pedal configured to adjust an acceleration opening degree in accordance with a pressed amount thereof; a hydraulic motor for travelling configured to be driven by a pressurized oil discharged from the hydraulic pump for travelling; a vehicle speed detecting section configured to detect a vehicle speed; a storage section configured to store engine torque curve data having a characteristic that an engine speed is reduced in proportion to increase in the vehicle speed towards a maximum vehicle speed; and a control unit configured to control the engine based on the engine torque curve data in accordance with a magnitude of the vehicle speed, the control unit being further configured to set a lower limit of a displacement of the hydraulic motor for travelling in order to maximize the vehicle speed at the acceleration opening degree limited to a predetermined amount. - View Dependent Claims (3, 7, 8, 9)
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Specification