Few reports on the development rules of hybrid excavators can be found. Kobelco is a pioneer in developing hybrid technology in excavators, with the first. Researches exploring energy saving in construction machines are urgently needed to solve the problems of environmental pollution and excessive fuel consumption. Synthesis of a mimo qft controller for hydraulic hybrid. Hitachi construction machinery, the company adopting the hybrid unit this time. Hydraulic hybrid technology is here to stay, and the reason is simple.
The purposes of hybrid hydraulic excavators hydraulic excavators are subject to large variations. Development history of hybrid loaders and excavators. A novel hybrid hydraulic architecture 6 builds on the success of the dc prototype excavator, by enabling storage and reuse of braking energy of the cabin in a highpressure hydraulic accumulator, via a series hybrid swing drive as shown in. For this reason, the turning circle and operating range of the hybrid hydraulic excavator have the same specifications as those of a fully hydraulic standard excavator.
Digital displacement technology developing a hybrid. Excavators, loaders, graders and dump trucks are common at every construction site, and some of these machines rely on hydraulics for every part of their operation, including the drive wheels in most cases. The literature shows many examples of innovative system architectures taking advantage of hydraulic or electric energy storage devices such as hydraulic accumulators, electric batteries or supercapacitors. Caterpillars new hybrid excavator uses hydraulics, not. Development history of hcm hybrid loaders and excavators 1. Cat how the hybrid excavator system works caterpillar. Development of 20tonne class hybrid excavator, sk200h10. Electric construction machinery hitachi construction. Hybrid wheel loaders incorporating power electronics. The development of an 8 tonne class hybrid hydraulic. A hydraulic excavator is a piece of mechanical excavating equipment specially designed to operate by the action of hydraulic cylinders and pistons. Many customers are reporting even greater fuel savings than that.
The system represents a new step in excavator hydraulics, as it aims to reduce both the hydraulic system losses as well as those of the internal combustion engine by using a hybrid hydraulic architecture with. Caterpillar has been talking in vague terms about its 336e h hydraulic hybrid excavator for several months now. Ict solutions to construction workplaces 2017 acquired joy global inc. It is believed that construction machinery generates. Energy management strategies for hybrid construction. Today s excavators have reached a mature level of technology using variablestroke hydraulic pumps. The central driver in the development of hybrid technology is fuel efficiency.
Development of hybrid hydraulic excavators hiroaki inoue and hiroshi yoshida system test group, test engineering center, development division, komatsu ltd. Development of power train of hybrid power excavator. Hybrid power technology is a practicable method for construction machinery to improve fuel utilization and reduce emissions. Though the traditional energy regeneration systemers which used a hydraulic motor and a generator in hybrid excavators can regenerate part of the energy, the power of the motor and the generator should be larger and the time for regenerating energy is so short. Construction machinery and mining solutions for increasingly di verse needs. A number of hybrid excavators, which are divided mainly into hydraulic hybrids and elec tric hybrids, have been developed and commercialized to save energy 8910 11. For caterpillars new hybrid excavator, hydraulic beats. Development of light sources for lithography at present and for the future 1,816kb introduction of products.
The cat 336e h uses a new hydraulic hybrid technology developed by caterpillar. Hydraulics is the forcing of a hydraulic fluid, similar to light oil, into a cylinder that has a piston housed within this cylinder. This paper first analyzes the difference between the hybrid powered automobile vehicle and the hybrid powered. Caterpillar developed the hydraulic hybrid technology, which includes an electronic standardized programmable pump, adaptive. It will move the same amount of material as our standard 336e, using up to 25 percent less fuel. Pdf 2019 surface mining product guide pdf understanding the critical steps in a projects development, from initial site survey and design, through to machine management. During the past three years the institute for fluid power drives and controls in aachen has developed a new hydraulic system for mobile machinery called steam.
New hybrid unit developed for construction machinery. Hydraulic excavator what does hydraulic excavator mean. The configuration of dc linear actuators used in this work was first proposed by rahmfeld and ivantysyonova in 1998. A 20ton hybrid excavator is the design target, in which a compound hybrid power configuration is applied, a negative. For this reason, we have developed a hybrid system for a hydraulic excavator. The 336e h hybrid, with its hydraulic technology, is extremely efficient. This paper first analyzes the difference between the hybrid powered automobile vehicle and the hybrid powered construction machinery. A hydraulic hybrid excavator with displacementcontrolled. That is, the control system is designed in such a way that dangerous situations will not occur. Hydraulic hybrid excavator based on common pressure rail hhec provides an alternative with electric hybrid excavator because it has high power density and environment friendly and easy to modify based on the existing manufacture. Oem manufacturer of hydraulic mini excavators 3 ton class excavator kubota, worlds no. Simulation of hydraulic and hybrid excavators springerlink.
A hybrid is independent of any particular technologyit doesnt have to be electric, says ken gray, global product manager for large hydraulic excavators for caterpillars excavation division. A series parallel hydraulic hybrid mini excavator with. Oil hydraulic systems are also required to supply high energies quickly to various actuators, including the. Careers with komatsu with over 3,400 employees across our oceania operations we offer the opportunity to have more than just a job. However, at the heart of all modern excavators lies a number of problems. Ultralarge electric hydraulic excavators ultralarge hydraulic excavator has an external cable power supply and threephase induction electric motor, and also many environmental benefits, such as no exhaust emissions and co2 from the excavator itself because no engine is onboard, as well as waste such as engine oil and filters not being. The hybrid system allows eliminating the power peaks. In this article, in order to achieve the maximum degree of energy conservation for hybrid hydraulic excavator, a study on a control strategy of the hybrid power train system for a 20t hybrid hydraulic excavator is. Komatsu hybrid excavators view the hybrid range what is a hybrid machine. In 2, the di erences between construction machinery and automobiles in working mode, key components and actuators were highlighted, and the hcm prototypes developed by the worlds.
Development of hybrid powered hydraulic construction machinery. Also, control system design for advanced excavation systems, such as automatic excavators and hybrid excavators, requires system models in order to design and simulate the control systems. A critical piece of the construction puzzle is the machinery used to make the work faster, safer and more efficient. Hydraulic hybrid excavatormathematical model validation. Review for development of hydraulic excavator attachment. Caterpillar has introduced a new line of hybrid excavators using an hydraulic accumulator to store and reuse energy. The first model, the cat 336e h, will be launched at bauma 20, with factory shipments beginning in march 20. Numerous studies have focused on optimisation of hybrid structures and power management strategies, whereas only a little attention has been paid to the control. A hydraulic hybrid excavator with displacementcontrolled actuation and pumpswitching technology. Energysaving research of excavators is becoming one hot topic due to the increasing energy crisis and environmental deterioration recently.
Caterpillar hydraulic hybrid excavator uses accumulator. Development of hybrid powered hydraulic construction. Hybrid technology is a new concept which is becoming a new means of fuel efficiency. They are rugged, dependable machines which operate in tough conditions. The purposes of hybrid hydraulic excavators hydraulic excavators are subject to large variations in workloads while repeating high work load operations, such as excavation, and low work load operations, such as leveling and smoothing. A number of hybrid excavators, which are divided mainly into hydraulic hybrids and electric hybrids, have been. In this paper, the development rules of parameters design and control strategy in hybrid excavator are presented. The hydraulic hybrid excavator with displacementcontrolled dc actuation was one of the most relevant outcomes of dr. Facing the environment problems, the improvement on the efficiency of the construction machinery such as the excavator and wheel loader is highly demanded. Stateoftheart, diverse hybrid systems are developed for construction machinery, like series or parallel hybrid hydraulic excavators 4. At first, the structure of new ers that combines the advantages of an electric and hydraulic. Hydraulic accumulatormotorgenerator energy regeneration. The dc sp architecture retains the circuits for the linear. Haulage system and hybrid hydraulic excavators 20 launched ictintensive bulldozers 2014 launched ictintensive hydraulic excavators 2015 introduced smartconstruction.
In 2005, komatsu started full scale development of a hybrid hydraulic excavator for the hydraulic excavators that are in most popular use in japan, aimed at reducing fuel consumption. Research article energysaving analysis of hydraulic. Energysaving analysis of hydraulic hybrid excavator based. In this paper, the development rules of parameters design. Introducing the hb335hb3651 hybrid hydraulic excavators 6,053kb introduction of hydraulic excavator pc8uspc128us10 6,317kb introduction of smallsize wheel loaders wa2707 and wa3207 2,544kb. Introducing the hb335hb3651 hybrid hydraulic excavators. Hydraulic excavators are from the most widely used earthmoving equipment in construction and mining industry, and they will continue to play an important role among ohighway vehicles in years to come. Development of hybrid powered hydraulic construction machinery, automation in construction, vol. Research on the energy regeneration systems for hybrid. System test group, test engineering center, development division. The development of excavators excavator was born in 1838, under steam, the arm operation rely on cable operations, to walk by wheel. Among various possibilities, methods to recuperate energy. The benefits include lower fuel costs, reduced exhaust emissions and a smaller carbon footprintall without any compromise in production, reliability, durability or operability in all applications. This paper reports the results of the verification test on the fuel economy of the hybrid excavator in actual operations.
Moreover,itdoesnotcancelthemultivalvesas ow control component for the cylinder, so the metering loss remains. Against a backdrop of rising environmental consciousness and requirements for low fuel consumption among customers using construction machinery, demand is growing for hybrid hydraulic excavators with engines and motors. A recent trend in the development of offhighway construction equipment, such as excavators, is to use a system model for modelbased system design in a virtual environment. Taking hydraulic excavator as an example, during each working cycle, the. The cat 336e h is the companys first machine to use a novel hydraulic hybrid. This week they finally let us peek under the hood and take a long, detailed look at. The 6ton kobelco series hybrid excavator prototype developed in 2007 uses this configuration. Optimization of energy regeneration of hybrid hydraulic. Typical operations of hydraulic excavators include grading, digging, and. The zaxis 200 hybrid hydraulic excavator is powered by a parallel hybrid system, and the new hybrid model uses an electric motor to drive the swing. The hybrid power systems used in automobiles have been adapted into the construction machinery. Construction machines play important roles in construction and agriculture.
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