Method for controlling a backhoe loader and backhoe loader

Patent metadata

Field	Value
Publication number	US-12584294-B2
Application number	US-202218289253-A
Country	US
Kind code	B2
Filing date	Aug 31, 2022
Priority date	Aug 25, 2022
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

The present disclosure relates to a method for controlling a backhoe loader and a backhoe loader, and relates to the field of engineering machinery. The method for controlling a backhoe loader includes: setting a power upper threshold P_0 for a variable displacement pump of the backhoe loader according to an operating mode of the backhoe loader; where the backhoe loader includes an engine, the variable displacement pump, a traveling system, a loading operation system, and a digging operation system; the operating mode includes: a traveling mode, a loading operation mode, and a digging operation mode; and adjusting the power upper threshold P_0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode. In the technical solutions, the power upper thresholds P_0 are different in different operating modes. Power of the variable displacement pump is adjusted in real time.

First claim

The invention claimed is:

1 . A method for controlling a backhoe loader, comprising the following steps of:
setting a power upper threshold P 0 of a variable displacement pump of the backhoe loader according to an operating mode of the backhoe loader; wherein the backhoe loader comprises an engine, the variable displacement pump, a traveling system, a loading operation system-( 4 ), and a digging operation system; and the operating mode comprises: a traveling mode, a loading operation mode, and a digging operation mode; and
adjusting the power upper threshold P 0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode;
wherein the adjusting the power upper threshold P 0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode comprises the following steps of:
determining whether the backhoe loader has a risk of overloading; and
lowering the power upper threshold P 0 of the variable displacement pump when the backhoe loader has the risk of overloading.

2 . The method for controlling a backhoe loader according to claim 1 , wherein whether there is the risk of overloading is determined according to:
operating condition characteristics, load changes, and changes of a rotating speed of the engine.

3 . The method for controlling a backhoe loader according to claim 1 , wherein the adjusting the power upper threshold P 0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode comprises the following steps of:
obtaining the actual load of the engine when the backhoe loader does not have a risk of overloading, determining operating condition characteristics according to a load condition within set time, and determining a maximum allowable load of the engine according to the operating condition characteristics; determining whether the actual load of the backhoe loader is less than the maximum allowable load of the engine; and increasing the power upper threshold P 0 of the variable displacement pump when the actual load of the backhoe loader is less than the maximum allowable load of the engine.

4 . The method for controlling a backhoe loader according to claim 1 , wherein the setting the power upper threshold P 0 , of the variable displacement pump according to the operating mode of the backhoe loader comprises:
setting the power upper threshold of the variable displacement pump of the backhoe loader to be P 01 when the operating mode of the backhoe loader is the loading operation mode, wherein sum of the power upper threshold P 01 and a maximum power P W required by the traveling system is greater than a power P engine of the engine, i.e. P 0 1+P W >P engine .

5 . The method for controlling a backhoe loader according to claim 1 , wherein the setting the power upper threshold P 0 of the variable displacement pump according to the operating mode of the backhoe loader comprises:
setting the power upper threshold P 02 of the variable displacement pump of the backhoe loader to be a maximum available power X 0 % of the engine when the operating mode of the backhoe loader is the digging operation mode, the engine being at the same rotating speed P 02 >P 01 .

6 . The method for controlling a backhoe loader according to claim 5 , wherein the X 0 ranges between 85 and 100.

7 . The method for controlling a backhoe loader according to claim 1 , wherein the setting the power upper threshold P 0 of the variable displacement pump according to the operating mode of the backhoe loader comprises:
setting the power upper threshold P 03 of the variable displacement pump of the backhoe loader to be a minimum power of the variable displacement pump when the operating mode of the backhoe loader is the traveling mode.

8 . The method for controlling a backhoe loader according to claim 1 , wherein when the operating mode is the loading operation mode, the method for controlling a backhoe loader further comprises the following steps of:
in the loading operation mode, determining whether the loading operation system is adjusted to an economic mode; wherein a maximum value of the rotating speed N engine of the engine does not exceed a set economic rotating speed N 0 when the determination result is YES.

9 . The method for controlling a backhoe loader according to claim 8 , wherein the set economic rotating speed N 0 is between 1,500 rpm and 2,000 rpm.

10 . A backhoe loader, comprising:
an engine; a variable displacement pump in driving connection with the engine; a traveling system in driving connection with the engine; a loading operation system hydraulically connected to the variable displacement pump; a digging operation system hydraulically connected to the variable displacement pump; and a control system in communication connection with both the engine and the variable displacement pump, the control system being configured to perform the method for controlling a backhoe loader according to claim 1 .

11 . The backhoe loader according to claim 10 , wherein the control system comprises:
a vehicle controller in communication connection with the variable displacement pump; and an engine ECM in communication connection with the vehicle controller and in communication connection with the engine.

12 . The backhoe loader according to claim 11 , wherein the control system further comprises:
an economic mode switch in communication connection with the vehicle controller.

13 . The backhoe loader according to claim 11 , further comprising:
a display in communication connection with the vehicle controller.

14 . The backhoe loader according to claim 13 , wherein the control system is configured to calculate a rotating speed n of the engine using a set formula based on an implement flow Q inputted from the display, and transmit a signal of the rotating speed of the engine to the engine ECM to control the rotating speed n of the engine.

15 . The backhoe loader according to claim 14 , wherein the set formula is n=Q/V MAX , n representing the rotating speed of the engine, Q representing the implement flow, and V MAX representing a maximum displacement of the variable displacement pump.

16 . The backhoe loader according to claim 14 , wherein the control system is further configured to shield a foot throttle signal and a hand throttle signal of the engine when the control system receives an implement flow signal, and the control system does not control the rotating speed n of the engine according to the foot throttle signal and the hand throttle signal of the engine.

17 . The backhoe loader according to claim 13 , wherein the backhoe loader comprises an automatic shift mode and a power shift mode, the automatic shift mode and the power shift mode being switched by means of the display.

18 . The backhoe loader according to claim 10 , wherein the control system is configured to set an economic rotating speed of the engine, and a power of the engine is set as a rated power when the rotating speed N engine of the engine is within a numerical range of the set economic rotating speed N 0 .

19 . The method for controlling a backhoe loader according to claim 18 , wherein the set economic rotating speed N 0 is between 1,500 rpm and 2,000 rpm.

Assignees

• Jiangsu Xcmg Construction Machinery Res Institute Ltd

Inventors

• Li Mingshuai
• Geng Yanbo
• Ji Zhe

Classifications

• F15B20/007

  Overload · CPC title

• E02F9/26

  Indicating devices {(E02F5/145 takes precedence)} · CPC title

• E02F9/24

  Safety devices {, e.g. for preventing overload (E02F9/226 takes precedence)} · CPC title

• E02F9/2296

  Systems with a variable displacement pump · CPC title

• E02F9/2246 Primary

  Control of prime movers, e.g. depending on the hydraulic load of work tools · CPC title