Work vehicle

Patent metadata

Field	Value
Publication number	US-10486697-B2
Application number	US-201615775327-A
Country	US
Kind code	B2
Filing date	Nov 1, 2016
Priority date	Nov 13, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A work vehicle including: a hydraulic stepless transmission that shifts a speed of a driving force from an engine; a gear shift pedal that performs an acceleration/deceleration operation of a shifted output from the hydraulic stepless transmission; a control section that controls the engine and the hydraulic stepless transmission based on an operation amount of the gear shift pedal; and acceleration/deceleration switches that increase and reduce a vehicle speed in performing an auto-cruise mode. The control section stores a set maximum vehicle speed. In a case where the acceleration/deceleration switches are operated in the auto-cruise mode, the control section increases and reduces the vehicle speed stored in shifting to the auto-cruise mode based on the amount of change in accordance with the maximum vehicle speed.

First claim

The invention claimed is:

1. A work vehicle comprising an engine mounted on a traveling body including a traveling wheel, a hydraulic stepless transmission mechanism configured to shift a speed of a driving force from the engine, a gear shift pedal configured to perform an acceleration/deceleration operation of a shifted output from the hydraulic stepless transmission mechanism, and a control section configured to control the engine and the hydraulic stepless transmission mechanism based on an operation amount of the gear shift pedal, the work vehicle being capable of performing an auto-cruise mode of keeping a vehicle speed substantially constant, the work vehicle further comprising:
an acceleration/deceleration switch configured to increase and reduce a vehicle speed in performing the auto-cruise mode, wherein
the control section stores a maximum vehicle speed set for each of a plurality of traveling modes, and
in a case where the acceleration/deceleration switch is operated in the auto-cruise mode, the control section increases and reduces a vehicle speed stored in shifting to the auto-cruise mode in accordance with the maximum vehicle speed.

2. The work vehicle according to claim 1 , further comprising:
a mode shift switch configured to perform switching among the plurality of traveling modes, wherein
the control section stores the maximum vehicle speed set for each of the plurality of traveling modes, and
in a case where the acceleration/deceleration switch is operated in the auto-cruise mode, the control section increases and reduces the vehicle speed stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum vehicle speed in the traveling mode specified by the mode shift switch.

3. The work vehicle according to claim 2 , further comprising:
an accelerator cooperation switch configured to perform an accelerator cooperation control of changing a vehicle speed in accordance with a pressing amount of the gear shift pedal and changing number of revolutions of the engine, wherein
in a case of shifting to the auto-cruise mode in performing the accelerator cooperation control, when the control section receives an operation on the acceleration/deceleration switch, the control section increases and reduces the vehicle speed and the number of revolutions of the engine stored in shifting to the auto-cruise mode.

4. The work vehicle according to claim 3 , wherein
the control section stores a maximum number of revolutions of the engine set for each of the plurality of traveling modes, and
in a case where the acceleration/deceleration switch is operated in the auto-cruise mode during execution of the accelerator cooperation control, the control section increases and reduces the number of revolutions of the engine stored in shifting to the auto-cruise mode depending on an amount of change in accordance with the maximum number of revolutions of the engine in the traveling mode specified by the mode shift switch.

5. The work vehicle according to claim 3 , wherein in a case where the acceleration/deceleration switch is operated in the auto-cruise mode, the control section increases and reduces the number of revolutions of the engine stored in shifting to the auto-cruise mode depending on an amount of change in accordance with an actual number of revolutions of the engine in shifting to the auto-cruise mode.

6. The work vehicle according to claim 1 , wherein in a case where the acceleration/deceleration switch is operated in the auto-cruise mode, the control section increases and reduces the vehicle speed stored in shifting to the auto-cruise mode depending on an amount of change in accordance with an actual vehicle speed in shifting to the auto-cruise mode.

Assignees

• Yanmar Co Ltd

Inventors

• Ogura Kouhei
• Miwa Toshiyuki
• Ikenori Kenta

Classifications

• G05G1/06

  Details of their grip parts {(G05G1/10 takes precedence)} · CPC title

• F16H61/66

  specially adapted for continuously variable gearings (control of exclusively fluid gearing F16H61/38) · CPC title

• F16H61/00

  Control functions within {control units of} change-speed- or reversing-gearings for conveying rotary motion {; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing} · CPC title

• F16H59/50

  Inputs being a function of the status of the machine, e.g. position of doors or safety belts · CPC title

• F16H59/12

  comprising push button devices · CPC title