Work vehicle and work vehicle control method

Patent metadata

Field	Value
Publication number	US-9446669-B2
Application number	US-201414903380-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Nov 26, 2013
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A state display section of a work vehicle is configured to display whether an electricity storage apparatus is in an electricity charging or discharging state. A state determination unit is configured to determine the state to be displayed on the state display section on the basis of a parameter corresponding to electricity supplied to or discharged from the electricity storage apparatus. The state determination unit is configured to change a threshold for a parameter for determining if the state to be displayed on the state display section is to be set to the charging state (discharging state) based on whether or not the state displayed on the state display section most recently is the charging state (discharging state). Until a predetermined first time period elapses, the state determination section is configured to determine the state after the change as the state to be displayed on the state display section.

First claim

The invention claimed is:

1. A work vehicle comprising:
an engine;
a working implement;
a travelling apparatus driven by the engine;
a power transmission apparatus configured to transfer a driving force from the engine to the travelling apparatus, the power transmission apparatus including an input shaft, an output shaft, and a motor;
an electricity storage apparatus configured to store electricity generated by the motor;
a state display section configured to display whether the electricity storage apparatus is in a charging state or a discharging state; and
a state determination unit configured to determine the state to be displayed on the state display section on the basis of a parameter corresponding to electricity supplied to the electricity storage apparatus or electricity discharged from the electricity storage apparatus;
the power transmission apparatus being configured so that a rotation speed ratio of the output shaft with respect to the input shaft is changed by changing of a rotation speed of the motor,
the state determination unit being configured to
determine whether or not to set the state to be displayed on the state display section to the charging state based on the magnitude relation of a first threshold and the parameter when the state displayed on the state display section most recently is the charging state;
determine whether or not to set the state to be displayed on the state display section to the charging state based on the magnitude relation of a second threshold different from the first threshold and the parameter when the state displayed on the state display section most recently is not the charging state;
determine whether or not to set the state to be displayed on the state display section to the discharging state based on the magnitude relation of a third threshold and the parameter when the state displayed on the state display section most recently is the discharging state; and
determine whether or not to set the state to be displayed on the state display section to the discharging state based on the magnitude relation of a fourth threshold different from the third threshold and the parameter when the state displayed on the state display section most recently is not the discharging state,

until a predetermined first time period elapses since the state to be displayed on the state display section changes to the charging state or the discharging state, the state determination section being configured to determine the state after the change as the state to be displayed on the state display section in a case where the state determination unit cannot determine to set the state to be displayed on the state display section to either of the charging state or the discharging state by using the first to the fourth thresholds.

2. The work vehicle according to claim 1 , wherein
in a case where the parameter is a positive value when electricity is discharged from the electricity storage apparatus and the parameter is a negative value when electricity is supplied to the electricity storage apparatus,
the state determination unit is configured to
determine to set the state to be displayed on the state display section to the charging state in a case where the parameter is smaller than the first threshold when the state displayed on the state display section most recently is the charging state;
determine to set the state to be displayed on the state display section to the charging state in a case where the parameter is smaller than the second threshold when the state displayed on the state display section most recently is not the charging state;
determine to set the state to be displayed on the state display section to the discharging state in a case where the parameter is larger than the third threshold when the state displayed on the state display section most recently is the discharging state; and
determine to set the state to be displayed on the state display section to the discharging state in a case where the parameter is larger than the fourth threshold when the state displayed on the state display section most recently is not the discharging state.

3. The work vehicle according to claim 1 , wherein
in a case where the parameter is a positive value when electricity is supplied to the electricity storage apparatus and the parameter is a negative value when electricity is discharged from the electricity storage apparatus,
the state determination unit is configured to:
determine to set the state to be displayed on the state display section to the charging state in a case where the parameter is larger than the first threshold when the state displayed on the state display section most recently is the charging state;
determine to set the state to be displayed on the state display section to the charging state in a case where the parameter is larger than the second threshold when the state displayed on the state display section most recently is not the charging state;
determine to set the state to be displayed on the state display section to the discharging state in a case where the parameter is smaller than the third threshold when the state displayed on the state display section most recently is the discharging state; and
determine to set the state to be displayed on the state display section to the discharging state in a case where the parameter is smaller than the fourth threshold when the state displayed on the state display section most recently is not the discharging state.

4. The work vehicle according to claim 1 , wherein
the absolute value of the second threshold is larger than the absolute value of the first threshold, and
the absolute value of the fourth threshold is larger than the absolute value of the third threshold.

5. The work vehicle according to claim 1 , wherein
the parameter electrical power charged onto or discharged from the electricity storage unit.

6. The work vehicle according to claim 5 , further comprising
a booster configured to convert a voltage of the electricity storage apparatus to a predetermined voltage,
the parameter being electrical power passing through the booster.

7. The work vehicle according to claim 1 , wherein
the parameter is an average value of electrical power, which is charged onto or discharged from the electricity storage unit, for a predetermined second time period.

8. The work vehicle according to claim 7 , further comprising
a booster configured to convert a voltage of the electricity storage apparatus to a predetermined voltage,
the parameter being an average value of electrical power passing through the booster for the predetermined second time period.

9. The work vehicle according to claim 1 , further comprising
an electricity storage amount display section configured to display the amount of electricity stored in the electricity storage apparatus,
the electricity storage amount display section including at least three elements and showing the amount of electricity stored in the electricity storage apparatus by means of a number of the elements which are lighted.

10. The work vehicle according to claim 9 , wherein
a gap between the largest electricity storage amount and the lowest electricity storage amount in the electricity storage apparatus in a state where one of the elements is lighted is larger than a gap between the largest electricity storage amount and the lowest electricity storage amount in the electricity storage apparatus in a state where any of two or more of the elements are lighted.

11. The work vehicle according to claim 9 , wherein
the state display section includes
a first display element configured to show that the electricity storage apparatus is in t

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Nakabayashi Masanobu
• Miyamoto Shunsuke
• Kishimoto Yasuki

Classifications

• B60W10/00

  Conjoint control of vehicle sub-units of different type or different function (for propulsion of purely electrically-propelled vehicles with power supplied within the vehicle B60L50/00 - B60L58/00) · CPC title

• B60K2006/381

  characterized by driveline brakes · CPC title

• B60L2200/40

  Working vehicles · CPC title

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title

• B60L15/2054

  by controlling transmissions or clutches · CPC title