Hydraulic Hybrid Energy-Saving Technology Research Of Tandem Vibratory Rollers

Tandem vibratory roller is one of the leading machines for road construction.Experimental results show that insufficiency engine power use, low fuel economy is commonin tandem vibratory roller, because of the large power differences between start&stoptransition process and stable compaction process. Carring out hybrid energy-savingtechnology research of tandem vibratory rollers in urgent is helpful for overcoming this issues,improving the dynamic characteristics of the system, realizing the energy-saving andemission-reducting, promoting the economy, reliability, safety and comfort of tandemvibratory roller.This project adopts a comprehensive research method which is guided by theoreticalanalysis, and combined experiment with simulation analysis. Taking a domestic14t tandemvibratory roller as the test object, test results as base, the load and energy characteristic ofvibratory roller is analyzed. It is shown that the energy gap between start&stop transitionprocess is relatively stable. Hydraulic accumulator can be used for the recovery of stop energyand compensation for start energy so as to reduce the installed power of the engine and keep itwork in the high efficiency area, which preliminary demonstrates the feasibility of the hybridtechnology’s application in tandem vibratory roller. Combining with the principle of hydraulichybrid system design, the applicative hybrid system design scheme is proposed.The principle of hydraulic hybrid system and the main parameters of the components aredetermined through the energy and power relationships between the engine, accumulator andload in different working stages. Considering dynamic characteristics and componentsproperties, the matching method of main components are summarized, the parameters of thecomponent is matched. The system control strategy premised at stable working quality, aimedat better fuel economy and driving performance is put forward after analyzing vibratoryroller’s working characteristics and hydraulic hybrid system’s operating mode. The criticalmodes of hybrid system-regenerative braking mode and mixed driving mode are analysed, thesecondary unit’s displacement control method suitable for load change is summed up.The original tandem vibratory roller model is established using MATLAB/SIMULINKsimulation software. The simulation results and experimental results are in good agreement,the correctness and feasibility of the model is verified. According to the mathematical modelsof components and systems, the hydraulic hybrid system model is established based on theoriginal model. From the simulation analysis results, it is shown that hydraulic hybrid systemis suitable for tandem vibratory roller,20%fuel economy improvement can be reached in speed for6km/h frequency for67Hz cases, a good energy-saving effect is achieved.