Work vehicle

Patent metadata

Field	Value
Publication number	US-10813271-B2
Application number	US-201616089680-A
Country	US
Kind code	B2
Filing date	Dec 8, 2016
Priority date	May 26, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A work vehicle incudes a traveling mechanism driven by a rotational power from an engine and an implement for effecting a ground work by the rotational power of the engine. The work vehicle further includes a load ratio calculation section 53 for calculating an engine load ratio indicative of an engine load of the engine, a ground speed calculation section 51 for calculating a ground speed of the vehicle body with using satellite positioning data, a slip ratio calculation section 52 for calculating a slip ratio indicative of slippage of the traveling mechanism relative to a ground surface by using the ground speed, a traveling work control section 4 for creating an appropriate traveling work state by controlling a rotational speed of the engine and a posture of the implement, and a traveling work management section 50 for outputting a state changing command that commands a change of the traveling work state, based on the engine load ratio and the slip ratio.

First claim

The invention claimed is:

1. A work vehicle comprising:
a vehicle body mounting an engine;
a traveling mechanism including a transmission and driven by a rotational power from the engine;
an implement for effecting a ground work in association with traveling of the vehicle body;
a load ratio calculation section for calculating an engine load ratio indicative of an engine load of the engine;
a ground speed calculation section for calculating a ground speed of the vehicle body using satellite positioning data;
a slip ratio calculation section for calculating a slip ratio indicative of slippage of the traveling mechanism relative to a ground surface by using the ground speed;
a traveling work control section for creating an appropriate traveling work state by controlling a rotational speed of the engine and a posture of the implement;
an engine control section provided in the traveling work control section and controlling an operational device of the engine;
an implement control section provided in the traveling work control section and controlling an operational device of the implement;
a traveling control section provided in the traveling work control section and controlling an operational device of the traveling mechanism; and
a traveling work management section for outputting a state changing command that commands a change of the traveling work state controlled by the rotational speed of the engine and the posture of the implement, based on the engine load ratio and the slip ratio.

2. The work vehicle of claim 1 , wherein the traveling work management section is configured to output a state changing command for changing the traveling work state to a more efficient traveling work state, on the condition that the engine load ratio is below a predetermined load lower threshold value AND that the slip ratio is below a predetermined slip lower threshold value.

3. The work vehicle of claim 1 , wherein the traveling work management section is configured to output a state changing command for reducing load of the implement, on the condition that the engine load ratio is below a predetermined load lower threshold value AND that the slip ratio exceeds a predetermined slip upper threshold value.

4. The work vehicle of claim 1 , wherein the traveling work management section is configured to output a state changing command for increasing the rotational speed of the engine, on the condition that the engine load ratio exceeds a predetermined upper threshold value AND that the slip ratio is below a predetermined lower threshold value.

5. A work vehicle comprising:
a vehicle body mounting an engine;
a traveling mechanism driven by a rotational power from the engine;
an implement for effecting a ground work in association with traveling of the vehicle body;
a load ratio calculation section for calculating an engine load ratio indicative of an engine load of the engine;
a ground speed calculation section for calculating a ground speed of the vehicle body using satellite positioning data;
a slip ratio calculation section for calculating a slip ratio indicative of slippage of the traveling mechanism relative to a ground surface by using the ground speed;
a traveling work control section for creating an appropriate traveling work state by controlling a rotational speed of the engine and a posture of the implement;
a traveling work management section for outputting a state changing command that commands a change of the traveling work state, based on the engine load ratio and the slip ratio,
wherein the traveling work management section includes a contribution ratio estimation section for estimating a contribution ratio of the slip ratio and a contribution ratio of the engine load to a reduction in the ground speed at time of reduction in the ground speed during constant speed traveling work and the traveling work management section is configured to output the state changing command based on the contribution ratios.

6. The work vehicle of claim 5 , wherein the traveling work management section is configured to output a state changing command for reducing load of the implement, if the contribution ratio of the slip is higher than the contribution ratio of the engine load, by a value exceeding a predetermined threshold value.

7. The work vehicle of claim 5 , wherein the traveling work management section is configured to output a state changing command for increasing the rotational speed of the engine, if the contribution ratio of the engine load is higher than the contribution ratio of the slip, by a value exceeding a predetermined threshold value.

Assignees

• Kubota Kk

Inventors

• Shinkai Atsushi

Classifications

• A01B63/112 Primary

  to control draught load, i.e. tractive force · CPC title

• B60W2710/30

  Auxiliary equipments · CPC title

• B60W2710/0661

  Speed change rate · CPC title

• B60W2300/152

  Tractors · CPC title

• A01B61/00

  Devices for, or parts of, agricultural machines or implements for preventing overstrain · CPC title