液壓挖掘機功率協(xié)調(diào)控制節(jié)能系統(tǒng)研究

1、 2006(3 工程機械天津工程機械研究院、 同濟大學與合肥礦山機器廠、 浙江大學與長江挖掘機廠、 廣西玉林柴油機廠合作, 都取得了一些成果。目前國內(nèi)液壓挖掘機大部分采用恒功率控制系 統(tǒng) 1, 為了使液壓挖掘機能適應(yīng)不同作業(yè)工況的需求目前國內(nèi)外挖掘機大多采用恒功率變量泵, 有 效地提高了液壓系統(tǒng)對負載功率的適應(yīng)性,防止了 發(fā)動機的過載 (這是恒功率控制最重要的功能 , 但 泵的工作點依然在受限制的狀態(tài) 2。 變量泵的恒功率 調(diào)節(jié)可采用機械式或微控制器 (MC 來實現(xiàn)。 一般的*國家 863項目 :液壓挖掘機機電一體化及制造信息化 , 課題編號 :2003AA43020019 2006(3工程機

2、械圖 2發(fā)動機與泵匹配功率曲線 圖 4系統(tǒng)組成20 2006(3 工程機械圖 6挖掘機工作時發(fā)動機轉(zhuǎn)速隨時間的波動曲線圖 5不同油門位置下發(fā)動機的允許掉速 21 2006(3工程機械22 Construction Machinery and EquipmentVol. 37No. 3Abstracts in English!DSP Based Trajectory Control System for Excavator At-tachmentAiming at the multiple variables and strong coupling characters of excavator

3、 attachment, a fuzzy self-adapting PID control algorithm was employed to realize trajectory control for excavator attachment with DSP chip TM S320LF2407A as electric control kernel, which features satisfactory stability and accuracy. The automation would decrease driver's fatigue and speed up co

4、nstruction schedule. Keywords:Excavator Attachment Control on trajectory DSP controller Fuzzy self-adapting PIDDesign and Development of a Real Time Monitoring and Alarm System for Operation Parameters of Construction VehiclesWhat described in the article is the overall structure, design of main har

5、dware circuit and software development of a real time monitoring and alarm system for operation parameters of construc-tion vehicles. M easures to resist electromagnetic interference in the system were briefly presented. With the system, real time monitor-ing on operation parameters of construction

6、vehicles, failure diag-nosing and alarm, recording and retrieving of failure parameters could all be realized.Keywords:Construction vehicle Monitoring AlarmSingle chip computerDesign of a New Type of Cutter Opening Ratio Adjusting Device of ShieldWide geological adaptability of a shield could be ach

7、ieved if the adjustment of its cutter opening ratio is realized in a tunnel, and at the same time, the shield can be used as a construction test ma-chine to discover the relationship between opening ratio and geo-logical conditions. An embedded cone type control device for opening ratio is a kind of

8、 new mechanism to adjust the cutter opening ratio. It features the advantages of wide range of adjust-ment, high automation level and work reliability. Structures of dif-ferent parts, composition and work principle of the adjusting de-vice are expatiated.Keywords:Shield Opening ratio Cone EmbedingAd

9、justmentResearch on a Energy-saving System with Power Coordi-nated Control for a Hydraulic ExcavatorA strategy of energy-saving control for excavator, coordinated con-trol between constant power and variable power, is suggested in the article. According to the diversity and complexity of loads varia

10、-tion, the controller adjusts engine and pump separately to create a satisfactory match state between them. The hydraulic pump fully absorbs and utilizes the power from engine to increase fuel utiliza-tion ratio and overall machine efficiency. The test on excavator prototype shows excellent energy-s

11、aving result. Keywords:Hydraulic excavator Power matchEnergy-savingA Simulation Study on Transient Temperature Field of Friction Pairs in a Wet Shift ClutchIn view of the wet shift clutch used on an existing developed com-pound drive device, model and boundary conditions for finite ele-ment analysis

12、 of the friction pairs are determined. Formulas to cal-culate heat flow density and heat convection coefficient of the fric-tion pairs are presented. With ANSYS finite element analysis soft-ware, simulation analysis of interior transient temperature field of the friction pairs during clutch engageme

13、nt under different work conditions was conducted.Keywords:Clutch Friction pair Transient temperature field Finite element Simulation researchMDT Based Parametric Design of a Steering Clutch on DozerSteering clutch is one of the important parts in steering mechanism of crawler dozer, its manually des

14、igning and drawing are very complicate procedures. Taking wet multi-disc friction clutch, which is widely used on dozers home and abroad, as an example, parametric design is applied to steering clutch on the platform of powerful M DT 3D design software. 3D parametric model building of some main comp

15、onents are described:parametric drawing was conducted with the chart drive function in M DT, parts and compo-nents database was set up and 3D assembly was achieved finally. The application of M DT standardizes and parameterizes the design of steering clutch, which greatly decrease the work volume of de-signers, increase design efficiency and shorten product develop-ment period, it provides a reference for the parametric design of other machinery produc