The control strategy for improving the stability of a powertrain for a compound hybrid power excavator

Yao, Hong; Wang, Qingfeng

doi:10.1177/0954407015574809

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…The schematic diagrams of the traditional power train system and HPTS are presented in Fig. 1 [5][6][7]. The drive torque of a hydraulic pump in a 20-t traditional hydraulic excavator works in typical working cycles is measured and given in Fig.…”

Section: Hybrid Power Train Systemmentioning

confidence: 99%

Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Chen

Lin

Ren

2018

IET Electric Power Applications

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A hybrid power train system (HPTS) is considered as a promising technology to improve the efficiency of excavators. In the hybrid hydraulic excavator, due to the drastic changes in the load, ultra-capacitors are employed to realise fast charge and discharge. Accordingly, a wide change of the DC voltage will happen. When the DC voltage is small, the maximum torque that the electric machine can output will be limited. The electric machine cannot fully compensate for the engine torque. Therefore, a novel direct torque control (DTC) is proposed for a permanent magnet synchronous machine (PMSM) in HPTS to reduce the influence of DC voltage on the maximum output torque of the PMSM. In this study, the mutual influence between the torque of the PMSM and DC voltage is analysed. The traditional DTC is briefly introduced. A novel DTC for the PMSM is presented. To validate the performance of the novel DTC, simulations and experiments are carried out. The results demonstrate that the proposed DTC can reduce the effect of DC voltage variation on the maximum output torque of the PMSM. Moreover, working points of the engine in HPTS can be better stabilised.

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Section: Hybrid Power Train Systemmentioning

confidence: 99%

Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Chen

Lin

Ren

2018

IET Electric Power Applications

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“…The hybrid excavator configurations presented in the literature 8,[23][24][25][26] can be divided into three categories: parallel types, series types and compound types. The hybrid excavator considered in this study is a midsize compound-type hybrid excavator (Figure 1), which is popular with companies and researchers because of its cost effectiveness and fuel efficiency.…”

Section: Configurationmentioning

confidence: 99%

Component sizing for compound hybrid excavators

Zhu

Wang

Chen

2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper proposes a novel component sizing method for a midsize compound hybrid excavator in which dynamic programming is used as the optimal energy management strategy. This method combines design optimization with the operating cycle and the control method. A multi-objective optimization method to minimize the fuel consumption and the component cost is also presented. In comparison with the traditional component sizing method, which considers only the power demand, this method allows an overall consideration of the fuel economy, the component cost, the power demand, the control method and the operating cycle. The design results show that the component size requirements are different for different control methods. The proposed component sizing method can deal with the trade-off between the fuel economy and the component cost while ensuring the work efficiency. Therefore, it is more applicable for the design of a compound hybrid excavator. Another contribution of the study is the development of a sizing law which can reduce the computation time of the proposed component sizing method. It uses an introduced variable, namely the number of efficient operating points of the engine, to determine the sizes of the assist motor and the ultracapacitor.

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“…Li et al 8 devised an approach on the basis of working condition along with the condition of the battery change for boosting the efficiency in terms of energy regeneration and quality of emission linked with the hybrid system. Yao and Wang 9 introduced a control technique for a compound hybrid excavator by incorporating a load torque distributor and a dynamic torque compensator. Lin et al 10 devised a motor–generator–accumulator system with the motive to recover the P.E.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of hybrid hydraulic excavator using multiple hydro-pneumatic accumulators

Ranjan

Bhola

Wrat

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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In this article, the heavy earth moving machinery like hydraulic excavator used in the construction and mining industries has been taken into consideration. Most of the heavy earth moving machineries used in these industries are mobile with engine as the main source of power. The work deals with two different hydraulic circuits: first the proposed one and second the conventional one, and both are studied at laboratory scale, which resembles the circuit of the hydraulic excavator. In the hydraulic circuit, out of the three hydraulic linear actuators, two are connected with hydro-pneumatic accumulators and one hydro-motor is also taken into consideration, which resembles the boom, arm, bucket and swing motor, respectively. The idea behind the proposed circuit is to store substantial potential energy during downward movement of the two linear actuators in the accumulators, which resembles the boom and arm cylinder of the excavator. The stored energy is used for upward motion of the two actuators without utilizing any energy from the main pump. For the devised strategy, MATLAB/Simulink environment has been utilized for developing the simulation model and the same has been validated with the experimental data with reasonable accuracy. The effect of accumulator volume and pre-charge pressure has been studied for optimization of the accumulator size on the validated simulation model. This concept helps in saving 14.06% energy than its conventional counterpart which does not have the energy storage elements. The linear position control of the boom and the arm actuator in the proposed circuit have been accomplished using proportional–integral–derivative control and pressure-compensated proportional flow control valve and have been achieved with reasonably accuracy.

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The control strategy for improving the stability of a powertrain for a compound hybrid power excavator

Cited by 13 publications

References 22 publications

Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Component sizing for compound hybrid excavators

Performance enhancement of hybrid hydraulic excavator using multiple hydro-pneumatic accumulators

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