EP4030003A1

EP4030003A1 - Hydraulic excavator control system and method

Info

Publication number: EP4030003A1
Application number: EP19944808.5A
Authority: EP
Inventors: Zhike SONG; Jiawen GENG; Dongdong NIU; Lixiang LIU; Lu Wang; Xutong WANG; Zecheng XING; Ji SONG; Hongmin WEI; Qing Wang; Qingrong BIAN; Xiangwei LIN; Chuanwei LV; Ding Wang
Original assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Current assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2022-07-20
Also published as: CA3150007A1; EP4030003A4; WO2021046736A1; AU2019465349A1; AU2019465349B2

Abstract

The present invention discloses a hydraulic excavator control system and method. The method includes: collecting, by a controller, an oil path pressure signal of a hydraulic excavator, and calculating a required main pump power according to the oil path pressure signal; sending, by the controller, the required main pump power to an engine ECM; and first adjusting, by the engine ECM, an engine oil injection quantity according to the required main pump power, and then adjusting, by the controller, a main pump power according to the required main pump power. The present invention greatly reduces the loading response time of the engine, improves the working efficiency of the whole machine, avoids the problem of black smoke from idle loading, and can further reduce an idle rotation speed of the engine and reduce fuel oil consumption.

Description

Technical Field

The present invention relates to a hydraulic excavator control system and method, and belongs to the technical field of hydraulic excavators.

Background

Working conditions for the hydraulic excavator are extremely complicated, and loads are greatly changed. When the load of a hydraulic pump is increased, an engine increases an oil injection quantity, and an output torque is increased; due to mechanical transmission, the engine would have a relatively long hysteresis quality. The following working states would frequently occur to the engine: one is that when the engine is suddenly loaded in a low load state, the loading time would be excessively long, rendering reduction of the working efficiency; the second one is that when the engine is suddenly loaded in an idle state, a problem of black smoke would occur. Most manufacturers would reduce the loading time of the engine by changing a mixture ratio of oil to gas in a combustion chamber of the engine; however, at the same time, the problems of inadequate combustion and black smoke of the engine would occur; when the problem of the black smoke occurs when in the idle speed, most manufacturers would improve the idle rotation speed of the complete machine, rendering energy consumption and wastes.

Summary

The purpose of the present invention is to overcome disadvantages in the prior at and provide a hydraulic excavator control system and method to solve the technical problems of reduction of the working efficiency when the engine is suddenly loaded in a low load state and the occurrence of black smoke when the engine is suddenly loaded in an idle state.
To resolve the technical problems above, the technical solution adopted in the present invention is as follows.
For a first aspect, the present invention provides a hydraulic excavator control method, including the following steps:

collecting, by a controller, an oil path pressure signal of a hydraulic excavator, and calculating a required main pump power according to the oil path pressure signal;
sending, by the controller, the required main pump power to an engine ECM; and
first adjusting, by the engine ECM, an engine oil injection quantity according to the required main pump power, and then adjusting, by the controller, a main pump power according to the required main pump power.

By combining with the first aspect, furthermore, the oil path pressure signal includes a main oil path pressure value of the hydraulic excavator and each pilot pressure value corresponding to a current action of the hydraulic excavator.
By combining with the first aspect, furthermore, the time for the engine ECM to start to adjust the engine oil injection quantity is ahead of the time for the controller to start to adjust the main pump power by 0.05-0.6 second.
For a second aspect, the present invention provides a hydraulic excavator control system including a controller, an engine ECM, and an oil path pressure collection unit, where the engine ECM and the oil path pressure collection unit are respectively communicationally connected to the controller;

the controller calculates, according to an oil path pressure signal of a hydraulic excavator collected by the oil path pressure collection unit, a required main pump power of the hydraulic excavator, and sends the required main pump power to the engine ECM; and
the engine ECM first adjusts an engine oil injection quantity according to the required main pump power, and then the controller adjusts a main pump power according to the required main pump power.

By combining with the second aspect, furthermore, the controller is communicationally connected to the engine ECM using a CAN bus.
By combining with the second aspect, furthermore, the oil path pressure collection unit includes a first pressure sensor configured to collect a main oil path pressure value of the hydraulic excavator and a second pressure sensor configured to collect each pilot pressure value corresponding to a current action of the hydraulic excavator.
As compared with the prior art, the beneficial effects achieved by the present invention are the time for the engine ECM to start to adjust the engine oil injection quantity is earlier than the time for adjusting the main pump to the required main pump power, so as to greatly reduce a loading response time of the engine, improve a working efficiency of the whole machine, avoid the problem of black smoke from idle loading, and may further reduce an idle rotation speed of the engine and reduce fuel oil consumption. In addition, the control method further has advantages of simple implementations, low costs, and high reliability.

Brief Description of the Drawings

FIG. 1 is a flowchart of a hydraulic excavator control method according to an embodiment of the present invention.
FIG. 2 is a hydraulic principle diagram of a hydraulic excavator control system according to an embodiment of the present invention.
FIG. 3 is a relation diagram between an engine oil injection quantity of a hydraulic excavator and time in the prior art.
FIG. 4 is a relation diagram between an engine oil injection quantity of a hydraulic excavator and time according to an embodiment of the present invention.

10-engine; 11-main pump; 12-pilot pump; 13-electromagnetic proportional valve; 14-main value; 15-hydraulic pilot handle; 16-controller; 17-traveling valve core; 18-rotation value core; 19-moving arm valve core; 20-scraper pan valve core; 21-pan rod valve core; and 22-electromagnetic valve.

Detailed Description

The following further describes the hydraulic excavator control system and method provided in the present invention in detail with reference to the accompanying drawings and specific embodiments. It should be explained that the accompanying drawings all adopt a quite simplified mode, all use imprecise proportions, and only conveniently and clearly assist the explanation of the purposes of the embodiments of the present invention. Same or similar reference numerals in the accompanying drawings represent same or similar members.

Embodiment I

FIG. 1 is a flowchart of a hydraulic excavator control method according to an embodiment of the present invention. The method mainly includes the following steps:
collecting a main oil path pressure value of the hydraulic excavator and each pilot pressure value corresponding to a current action of the hydraulic excavator; obtaining, by the controller, a required main pump power according to the main oil path pressure value and each pilot pressure value corresponding to the current action of the hydraulic excavator, and sending the required main pump power to an engine ECM; the controller being capable of adjusting the main pump power according to the required main pump power; the engine ECM being capable of adjusting an engine oil injection quantity according to the required main pump power, and the time for the engine ECM to start to adjust the engine oil injection being earlier than the time for the controller to start to adjust the main pump power.
The time for the engine ECM to start to adjust the engine oil injection being earlier than the time for the controller to start to adjust the main pump power can greatly reduce a loading response time of the engine, improve a working efficiency of the whole machine, avoid the problem of black smoke from idle loading, and may further reduce an idle rotation speed of the engine and reduce fuel oil consumption. In addition, the control method further has advantages of simple implementations, low costs, and high reliability.
More specifically, the time for the engine ECM to start to adjust the engine oil injection quantity is ahead of the time for the controller to start to adjust the main pump power by 0.05-0.6 second, which matches and is consistent with the hydraulic system requirements, and improves the working efficiency of the entire machine by 1-5%.

Embodiment II

FIG. 2 is a hydraulic principle diagram of a hydraulic excavator control system according to an embodiment of the present invention. The system includes an engine 10, a main pump 11, a pilot pump 12, an electromagnetic proportional valve 13, a main value 14, a hydraulic pilot handle 15, a controller 16, a first pressure collection unit, and a second pressure collection unit.
The engine 10 is connected to the main pump 11 and the pilot pump 12 for providing power for the main pump 11 and the pilot pump 12.
The main valve 14 includes a traveling valve core 17, a rotation value core 18, a moving arm valve core 19, a scraper pan valve core 20, and a pan rod valve core 21. After an outlet of the main pump 11 is connected to an inlet of the main valve 14 through a pipeline, it is sequentially connected to the traveling valve core 17, the rotation value core 18, the moving arm valve core 19, the scraper pan valve core 20, and the pan rod valve core 21 for providing oil for each action valve core and constituting a main oil path; an oil return port of the main valve 14 is connected to an oil tank after passing through an electromagnetic valve 22.
The pilot pump 12 is connected to an inlet of the electromagnetic proportional valve 13; a path of an outlet of the electromagnetic proportional valve 13 is connected to a tilting plate adjuster control port of the main pump 11.
The hydraulic pilot handle 15 is separately connected to a pilot control oil port of each action valve core for controlling connection and disconnection of each action valve core.
The first pressure collection unit and the second pressure collection unit are respectively in communicative connection to the controller 16. The first pressure collection unit is used for collecting the main oil path pressure value of the hydraulic excavator; the second pressure collection unit is used for collecting the pilot control oil path pressure value of each action valve core; the controller 16 can obtain the required main pump power according to the main oil path pressure value and the pilot control oil path pressure value of each action valve core and adjust the power of the main pump 11 of the hydraulic excavator according to the required main pump power.
The controller 16 is communicationally connected to the engine ECM for delivering the required main pump power to the engine ECM of the hydraulic excavator.
The time for the engine ECM to start to adjust the engine oil injection quantity is ahead of the time for the controller to start to adjust the main pump power; the time difference is generally 0.05-0.6 second, which can match and be consistent with the hydraulic system requirements, and improve the working efficiency of the entire machine by 1-5%. FIG. 3 is a relation diagram between an engine oil injection quantity of a hydraulic excavator and time in the prior art. FIG. 4 is a relation diagram between an engine oil injection quantity of a hydraulic excavator and time according to an embodiment of the present invention. The relation diagram is obtained when the difference between the time for the engine ECM to start to adjust the engine oil injection and the time for the controller to start to adjust the main pump power is 0.1 second; as can be seen from comparison and analysis that as compared with the hydraulic excavator in the prior art, a hydraulic excavator provided in embodiment II of the present invention can greatly reduce a loading response time of the engine 10, so as to improve a working efficiency of the whole machine, and avoid the problem of black smoke from idle loading, and may further reduce an idle rotation speed of the engine 10 and reduce fuel oil consumption. In addition, it further has advantages of simple implementations, low costs, and high reliability.
The first pressure collection unit, the second pressure collection unit, and the engine ECM can be connected to the controller 16 through the CAN bus.
The first pressure collection unit and the second pressure collection unit are pressure sensors; as shown in FIG. 2, a pressure sensor is separately disposed on the pilot control oil path of the rotation value core 18, the moving arm valve core 19, the scraper pan valve core 20, and the pan rod valve core 21.
In conclusion, the hydraulic excavator control system and method provided by the embodiment of the present invention includes: collecting a main oil path pressure value of the hydraulic excavator; obtaining, by a controller, a required main pump power according to the oil path pressure value; the controller being used for adjusting, according to the required main pump power, the power of the main pump and delivering the required main pump power to an engine ECM; the time for the engine ECM to start to adjust the engine oil injection being earlier than the time for the controller to start to adjust the main pump power so as to greatly reduce a loading response time of the engine, improve a working efficiency of the whole machine, avoid the problem of black smoke from idle loading, and further reduce an idle rotation speed of the engine and reduce fuel oil consumption. In addition, the control method further has advantages of simple implementations, low costs, and high reliability.
It should be explained that each embodiment in this specification is described in a progressive manner; each embodiment mainly illustrates the difference from other embodiments; same and similar parts among the embodiments can refer to one another. For the control method disclosed in the embodiments, since the adopted control device partially corresponds to the device disclosed by the embodiments, the description of the control device involved therein is relatively simple and the relevance can refer to the explanation of the device part.
The descriptions above are only used for describing the preferable embodiments of the present invention, rather than any limitation to the range of the present invention; any change and modification made by a person having ordinary skilled in the art of the present invention according to the contents disclosed above is within the scopes of protection of the claims.

Claims

A hydraulic excavator control method, comprising the following steps:
collecting, by a controller, an oil path pressure signal of a hydraulic excavator, and calculating a required main pump power according to the oil path pressure signal;

sending, by the controller, the required main pump power to an engine ECM; and

first adjusting, by the engine ECM, an engine oil injection quantity according to the required main pump power, and then adjusting, by the controller, a main pump power according to the required main pump power.
The hydraulic excavator control method according to claim 1, wherein the oil path pressure signal comprises a main oil path pressure value of the hydraulic excavator and each pilot pressure value corresponding to a current action of the hydraulic excavator.
The hydraulic excavator control method according to claim 1, wherein the time for the engine ECM to start to adjust the engine oil injection quantity is ahead of the time for the controller to start to adjust the main pump power by 0.05-0.6 second.
A hydraulic excavator control system comprising a controller, an engine ECM, and an oil path pressure collection unit, wherein the engine ECM and the oil path pressure collection unit are respectively communicationally connected to the controller;
the controller calculates, according to an oil path pressure signal of a hydraulic excavator collected by the oil path pressure collection unit, a required main pump power of the hydraulic excavator, and sends the required main pump power to the engine ECM; and

the engine ECM first adjusts an engine oil injection quantity according to the required main pump power, and then the controller adjusts a main pump power according to the required main pump power.
The hydraulic excavator control system according to claim 4, wherein the controller is communicationally connected to the engine ECM using a CAN bus.
The hydraulic excavator control system according to claim 4, wherein the oil path pressure collection unit comprises a first pressure sensor configured to collect a main oil path pressure value of the hydraulic excavator and a second pressure sensor configured to collect each pilot pressure value corresponding to a current action of the hydraulic excavator.