Speed control structure and method for work vehicle
First Claim
Patent Images
1. A work vehicle comprising:
- an engine;
a continuously variable speed change device receiving power from the engine;
wheels driven under the power from the continuously variable speed change device;
a speed change position sensor detecting a speed change position of the continuously variable speed change device;
a speed change operating device setting the speed change position to be requested to the continuously variable speed change device;
an operation position sensor detecting an operation position of the speed change operating device;
a control device configured to determine a target operation position of the continuously variable speed change device based on a speed change position detection signal from the speed change position sensor, and to output a control signal for correlating the determined target operation position with a current operation position calculated based on the speed change position detection signal from the operation position sensor; and
a display device connected to the control device,wherein the control device is configured to set a limit operation position of the continuously variable speed change device based on the current operation position, an actual engine rotation speed and a drop amount of the actual engine rotation speed from a set engine rotation speed; and
a limit operation position image is displayed on the display device along with the current position image, the limit operation position image indicating the limit operation position.
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Abstract
A load control system for a work vehicle including set rotation speed detection means for detecting a set rotation speed of an engine of the work vehicle, actual rotation speed detection means that senses an actual rotation speed of the engine, a continuously variable speed change device that receives power from the engine of the work vehicle, speed change position detecting means for detecting a speed change operating position of the continuously variable speed change device, operating means for speed-shifting the continuously variable speed change device, and control means for controlling the operation of the operating means.
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Citations
8 Claims
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1. A work vehicle comprising:
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an engine; a continuously variable speed change device receiving power from the engine; wheels driven under the power from the continuously variable speed change device; a speed change position sensor detecting a speed change position of the continuously variable speed change device; a speed change operating device setting the speed change position to be requested to the continuously variable speed change device; an operation position sensor detecting an operation position of the speed change operating device; a control device configured to determine a target operation position of the continuously variable speed change device based on a speed change position detection signal from the speed change position sensor, and to output a control signal for correlating the determined target operation position with a current operation position calculated based on the speed change position detection signal from the operation position sensor; and a display device connected to the control device, wherein the control device is configured to set a limit operation position of the continuously variable speed change device based on the current operation position, an actual engine rotation speed and a drop amount of the actual engine rotation speed from a set engine rotation speed; and a limit operation position image is displayed on the display device along with the current position image, the limit operation position image indicating the limit operation position. - View Dependent Claims (2)
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3. A work vehicle comprising:
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an engine; a continuously variable speed change device receiving power from the engine; wheels driven under the power from the continuously variable speed change device; a speed change position sensor detecting a speed change position of the continuously variable speed change device; a speed change operating device setting the speed change position to be requested to the continuously variable speed change device; an operation position sensor detecting an operation position of the speed change operating device; a control device configured to determine a target operation position of the continuously variable speed change device based on a speed change position detection signal from the speed change position sensor, and to output a control signal for correlating the determined target operation position with a current operation position calculated based on the speed change position detection signal from the operation position sensor; and a display device connected to the control device, wherein a current position image is displayed on the display device, the current position image indicating the current operation position in accordance with a movement of the speed change operating device, wherein the current position image is displayed at every moment in accordance with the movement of the speed change operating device. - View Dependent Claims (4)
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5. A work vehicle comprising:
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an engine; a continuously variable speed change device receiving power from the engine; wheels driven under the power from the continuously variable speed change device; a speed change position sensor detecting a speed change position of the continuously variable speed change device; a speed change operating device setting the speed change position to be requested to the continuously variable speed change device; an operation position sensor detecting an operation position of the speed change operating device; a control device configured to determine a target operation position of the continuously variable speed change device based on a speed change position detection signal from the speed change position sensor, and to output a control signal for correlating the determined target operation position with a current operation position calculated based on the speed change position detection signal from the operation position sensor; and a display device connected to the control device, wherein a current position image is displayed on the display device, the current position image indicating the current operation position in accordance with a movement of the speed change operating device, wherein a target operation position image is displayed on the display device along with the current position image, the target operation position image indicating the target operation position. - View Dependent Claims (6)
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7. A work vehicle comprising:
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an engine; a continuously variable speed change device receiving power from the engine; wheels driven under the power from the continuously variable speed change device; a speed change position sensor detecting a speed change position of the continuously variable speed change device; a speed change operating device setting the speed change position to be requested to the continuously variable speed change device; an operation position sensor detecting an operation position of the speed change operating device; a control device configured to determine a target operation position of the continuously variable speed change device based on a speed change position detection signal from the speed change position sensor, and to output a control signal for correlating the determined target operation position with a current operation position calculated based on the speed change position detection signal from the operation position sensor; and a display device connected to the control device, wherein a current position image is displayed on the display device, the current position image indicating the current operation position in accordance with a movement of the speed change operating device, wherein the control device is configured to set a limit operation position of the continuously variable speed change device based on the current operation position, an actual engine rotation speed, and a drop amount of the actual engine rotation speed from a set engine rotation speed; and a limit operation position image is displayed on the display device along with the current position image, the limit operation position image indicating the limit operation position. - View Dependent Claims (8)
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Specification