Abstract In this paper, a new type Electric Hydraulic Actuator(New EHA) adopted variable displacement pump is presented to enhance the dynamic response of EHA. This system combines advantages electric with hydraulic systems and it easy be integrated whole system, which promising tendency save energy control performance. Firstly, basic principle difference traditional EHA are introduced. Moreover, mathematical model constructed. Then, controller by using fuzzy algorithm designed. Finally,...

In order to meet the energy saving requirement of excavator, hybrid excavators are becoming hot spot for researchers. The initial problem is match parameter each component, because system tending be more complicated due introduction accumulator. this paper, firstly, a new architecture presented which hydraulic excavator based on common pressure rail combined switched function (HHES). Secondly, general principle dynamic programming algorithm (DPA) explained. Then, method by using DPA matching...

A comprehensive multi-domain simulation tool that could predict the lubricating flow between piston and bushing in cylinder is presented this paper. The first module simulates main through pump according to a lumped parameter model. estimation of instantaneous pressure each displacement chamber utilized another dedicated prediction gap bushing. This numerical model based on fluid-structure interaction algorithm which fluid film calculated by Reynolds equation. oil height determined...

Energy-saving research of excavators is becoming one hot topic due to the increasing energy crisis and environmental deterioration recently. Hydraulic hybrid excavator based on common pressure rail (HHEC) provides an alternative with electric because it has high power density environment friendly easy modify existing manufacture process. This paper focused fuel consumption HHEC actuator dynamic response assure that new system can save without sacrificing performance. Firstly, we introduce...

This paper investigates the problems of robust stabilization and control for secondary component speed system with parameters uncertainty load disturbance. The aim is to enhance performance hydraulic based on Common Pressure Rail (CPR). Firstly, a mathematical model presented describe system. Then novel observer proposed, an observed-based strategy designed such that closed-loop asymptotically stable satisfies disturbance attenuation level. condition existence developed controller can by...

Because of its excellent tribological performance, polyether–ether–ketone (PEEK)-based coatings have been used extensively under mixed and boundary water-lubrication conditions. To verify that the PEEK-based coating is applicable to aviation kerosene, one advanced was proposed two typical metals, namely, alloy steel 38CrMoAlA tin bronze ZQPb17-4-4, were selected as counterparts. Four sets experiments involved a scuffing (step load) Stribeck curve speed), constant load, strengthened load...

The overturning and eccentric abrasion of the slipper worsens lubrication characteristics increases friction power loss kinetic energy consumption slipper/swashplate interface to reduce axial piston pump efficiency. A coupling numerical model algorithm a micro-chamfering structure are developed proposed predict more precisely improve interface. simulation results reveal that without overturns contacts with swashplate, while one forms certain oil film thickness prevent this contact...

In order to enhance the efficiency of hydraulic system, one new-type transformer is presented in this paper. First, basic structure and principle are explained. Then, mathematical models including both inner outer loops analyzed. Moreover, two kinds control methods discussed corresponding loops, respectively. Furthermore, proposed strategies translated into simulation languages, made Simulink. Finally, prototypes test rig constructed performance. Both simulated experimental results show that...

In order to decrease the tilt and eccentric abrasion of a slipper improve lubrication performance slipper-swashplate interface in an axial piston pump, this paper proposes comprehensive numerical simulation method predict designs three types microstructures such as micro-chamfering, micro-filleting micro-stepping performance. The lumped-parameter pressure-flow model pump have been developed. These models consider pressure slipper's center oil pool, hydrostatic lubrication, hydrodynamic...

The leakage flow is the vital index judging axial piston pumps, which strongly influenced by wear resulting from cylinder block tipping against valve plate. In order to improve energy efficiency and realize reliable design of this paper presents an integrated model predict block/valve plate interface performance, numerically solving Reynolds equation coupled with elasto-hydrodynamic deformations, pressure-viscosity effect, asperity contacts. film thickness distribution in steady state...

This paper describes the basic components and characteristics of hydraulic secondary regulation system based on CPR(Common Pressure Rail), then primarily focuses application CPR in various industries combined with advantages which can recover energy drive several loads independently rather than great interference each other. Also analyses key technologies including exposition development process transformer, analysis energy-saving constant pressure control pumping station CPR, looks forward...

Parallel hydraulic hybrid vehicles (PHHV) have the potential of improving fuel economy by operating engine in optimum efficiency range and making use regenerative braking during deceleration. Based on analysis characteristics city drive cycle high power density vehicles, a new strategy tailored specially for PHHV was proposed to improve economy. The simulation results shown that reasonably distributed torque traditional friction torque, effectively regenerated energy vehicle under premise...

Regenerative braking is a major means of hybrid vehicle to improve fuel economy. To ensure the safety brake basic requirement vehicles. This article discusses that principle regenerative system hydraulic bus compound based on ground coupling, and introduces force distribution strategy through integrated control machinery hydraulics according demands for driver. The simulation model established MATLAB/SIMULINK/STATAFLOW with method simulation. effect energy recovery demand condition under...