With the progress and development of modern science and technology and the wide application of construction machinery, the automation and intelligence level of construction machinery has been improved. The operation and control of construction machinery realize the combination of automation, integration and intelligence. After the intelligent control system was introduced into the control field of construction machinery, it has brought epoch-making changes to the development of construction machinery, and the operation convenience, safety and economy of construction machinery have been greatly improved. Intellectualization has become the most obvious symbol of the modernization of various construction machinery. At present, the intellectualization of construction machinery is mainly reflected in three aspects: intelligent engineering control technology, intelligent monitoring, detection, fault diagnosis and maintenance technology of construction machinery, and network cluster integrated control.

1. Intelligent control technology intelligent control technology includes electro-hydraulic control automatic shift transmission technology, unmanned operation technology, electromechanical hydraulic integration control technology and so on. The electro-hydraulic control automatic shift system consists of hydraulic shift control system and electronic shift control system. The electro-hydraulic shift control system has the advantages of compact structure, small volume and light weight, and replaces the more complex mechanical linkage device. The reliability of shift response is improved. Automatic shift and mechatronics control technology are widely used in construction machinery. Unmanned operation technology is a breakthrough development of mechanical engineering. Unmanned operation technology is used in specific fields. Such as military, survey, aerial photography, flammable and explosive areas, high-altitude dangerous operation areas, high-risk radiation areas, satellite detection and other fields. Intelligent unmanned mechanical engineering technology is needed. Unmanned control system of Automation Center, robot operation, GPS navigation, wireless and wired network communication. Unmanned vehicle driving and other technologies are the application of unmanned operation technology in mechanical engineering. Since the 1970s, the United States, Britain, Germany and other developed countries began to study driverless vehicles. China's National Defense University of science and technology successfully developed China's first truly driverless vehicle in 1992. In 2005, the first urban driverless vehicle was successfully developed in Shanghai Jiaotong University. At present, driverless technology has made some achievements in the research and product development of driverless technology. However, the development level of unmanned operation technology in China is low, and more efforts need to be made to form industrialized production.

2. Intelligent engineering monitoring, detection, fault diagnosis and maintenance technology of construction machinery. Foreign scholars have done a lot of research on the fault diagnosis system of construction machinery, and have made relatively mature and perfect technical achievements, which are widely used in products. For example, the bord electronic monitoring system developed by German OK company can monitor all important parameters related to the operation and maintenance of hydraulic excavator, and use microprocessor to check the excavator operation data, quickly monitor, evaluate and display the calculated data. It can identify the trend of failure and exceeding the limit value, and display alarm information before major accident. Hitachi of Japan has installed an electronic monitoring and fault diagnosis system on zaxis series hydraulic excavators. It can detect more than 40 operating states of the excavator in real time, including engine oil pressure, cooling water temperature, fuel level, hydraulic oil level, air filter blockage, engine speed, hydraulic flow and all electrical system parameters. It also has the alarm function. At the same time, it can automatically diagnose the fault of the machine through the special detector matched with the machine. The research on fault diagnosis of construction machinery in China started late. But it has developed rapidly. In recent years, many universities and scientific research institutions have made great progress in the research of fault diagnosis theory and method of construction machinery. For example, the holographic spectrum theory initiated by scholars of Xi'an Jiaotong University fully integrates the amplitude, frequency and phase information of machine vibration. The fault recognition rate is significantly improved. Scholars of Tsinghua University aim at the strong noise background of rolling bearing fault vibration signal and the characteristics that it is difficult to obtain a large number of typical fault samples in reality. The flexible morphological filtering technology is applied to the fault diagnosis of rolling bearing. After the flexible morphological filtering, the edge contour and shape features of the bearing vibration signal with local defects can be effectively extracted. At the same time, it is robust. In practical application. Since the 1990s, scholars from Zhejiang University and Tongji University have begun to engage in the research of fault diagnosis of construction machinery. The working condition monitoring system has been developed in cooperation with Changjiang excavator factory, Guangxi Yulin Diesel Engine Factory and other enterprises. Real time monitoring of hydraulic, engine and electrical operation status parameters. It is displayed on the LCD screen. When fault information is detected, it will alarm through sound, light and image.

3. Network cluster integrated control, cluster is a system composed of multiple construction machinery with different functions by network communication. A certain engineering task is completed through multi machine coordination and joint operation. Cluster control technology is the optimal configuration or combination of clusters. That is, taking the mechanized operation cluster system as the object, using the methods of statistics, operations research, simulation and so on. Through analysis and judgment, the system coordinate function is established, and then the optimal result of the system is obtained by optimization method. Make the operation of various mechanical equipment in the system coordinate with each other, so as to obtain a cluster control system with advanced technology, economic rationality, reliable operation and high efficiency. In 2003, Jiangsu XCMG group undertook and completed the project of "cluster intelligent construction machinery". Including intelligent paver, mixing station, roller, loader, articulated dump truck and all road truck crane. The comprehensive benefit of construction will be increased by more than 25, and the maintenance cost of construction equipment will be reduced by 20. The WD-10 automatic multiple trackless stacker developed by Hefei intelligent Institute of Chinese Academy of Sciences and Hefei Forklift Factory is the first elevated stacker based on network control in our country. This technology integrates cluster optimal configuration, intelligent scheduling, cooperative control and data communication technology.