After launching a new generation of hydraulic excavators, caterpillar promised the "fuel consumption guarantee plan" to customers; Compared with the traditional hydraulic excavator before, Xiaobian found that the pump room of the fully electric excavator became empty without exception. After a period of wait and see, the domestic main engine manufacturers have also launched fully electronic controlled excavators.
So the question is, what is the uniqueness of the fully electric excavator compared with the conventional hydraulic excavator? Why does the manufacturer choose to switch over a large area at this time? What are the advantages and disadvantages of "full electronic control" for manufacturers and users? Does the user's subsequent use cost increase or decrease?
In fact, all electric control technology has long been applied to excavators, which is not a new technology. However, domestic host manufacturers "follow the trend" and choose to switch on a large scale at this time. Industry insiders said that the most direct reason may be that under the situation of "fierce competition in the domestic excavator market and declining profits", the main engine manufacturers expect to change the status quo through "new" technology upgrading. For the main engine plant, the full electronic control technology has four advantages.
First, reduce fuel consumption. The fully electronic control technology makes the pipeline simpler because there is no front-end pilot pump. The traditional hydraulic control is to output hydraulic oil through the hydraulic pump and distribute it to the oil cylinder through the main valve for action. The hydraulic valve core responsible for distribution is controlled by the pilot oil circuit, and the pilot oil controls the on-off of the valve core to distribute the main oil circuit. In contrast, the fully electronic control reduces the pilot pump. Through proportional valve control (one of the technical routes of fully electronic control), the flow resistance loss and transmission response lag of the hydraulic pilot are reduced, so as to achieve more efficient power distribution, improve fuel utilization, and then achieve the purpose of reducing fuel consumption.
Secondly, it is helpful for the main engine manufacturers to realize the autonomy of pump valve power electronic control. Compared with the traditional hydraulic control combined pump, the fully electronic control technology reduces the pilot pump. The main engine manufacturers can independently develop the electronic control, and the pump valve engine matching is more intelligent. The manufacturers with R & D and manufacturing capabilities have begun to "make their own" and have reduced their dependence on the main pump and main valve parts suppliers.
Third, reduce production costs. The fully electric excavator reduces the pilot pump (one of the fully electric control technical routes) and part of the hydraulic pipeline, which is conducive to reducing the production cost of the main engine plant, thus making it possible to "further explore the excavator price". Some main engine manufacturers also said that the increase of electric control valves and solenoid valves will also bring about a certain increase in costs. The two offset each other, and the production costs are basically the same as before.
Finally, improve the driving experience. The problem that "the motion smoothness of domestic excavators is worse" is one of the key points that users roast.
Due to the development of independent electronic control by the host manufacturer, the matching of pump valve engine is more intelligent, making it easier to realize intelligent control and intelligent auxiliary functions, such as intelligent leveling, accurate slope repair, intelligent auxiliary mining, etc. At the same time, more operation modes can be set. In addition to switching between light and heavy working conditions, the user can also adjust the loading rotation speed as required. Therefore, it will be replaced by light control, precise movement and smooth experience
From the above aspects, the fully electric excavator can reduce fuel consumption, achieve technical autonomy, reduce costs, improve driving experience, and provide users with a cost-effective "new excavator", which seems to be a win-win move for the OEMs and end users.
However, an excavator maintenance master who has worked for more than 15 years has a wait-and-see attitude towards "all kinds of benefits": "although I have not repaired the fully electric excavator myself, I am very clear about the difficulty of the electric control technology." He said, "I'm afraid the electric control can't be repaired in the later stage."
For example, he said: "in some saline alkali land, seaside and other working conditions, the circuit of the fully electric excavator is more likely to be corroded, and users will face new challenges in subsequent use."
According to the analysis of a senior user, "in fact, the main engine manufacturers are setting up a bigger chess game - taking advantage of the non road 'National four' switch, they will comprehensively upgrade the excavators and comprehensively switch the electric control technology. In the future, while further sinking the price of new machines, they will not rule out taking back the post market profits through technical barriers."
Even so, the switching of all electronic control technology has been unstoppable.
According to incomplete statistics of the minor editor, the brands and models that have been switched or are being switched include: Carter's new generation hydraulic excavator, Shandong Lingong FEH series excavator (including the "national four" model), Hyundai Doosan dx245-9c excavator, Liugong F series medium and large excavators (including the "national four" model), Sany 215C hope excavator, etc.
