Optimal Control for the Series-Parallel Displacement Controlled Hydraulic Hybrid Excavator

Zimmerman, Joshua D.; Hippalgaonkar, Rohit; Ivantysynova, Monika

doi:10.1115/dscc2011-5996

Cited by 19 publications

(24 citation statements)

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“…This decision is useful for comparing the original system, and it will simplify the development of a prototype machine. In future work, the travel system can be integrated easily, so that we can use SHTs which are used for controlling the boom and stick to control travel motors because the travel system and other actuators are not usually used simultaneously [32]. …”

Section: Sizing Of Hhecmentioning

confidence: 99%

Energy‐Saving Analysis of Hydraulic Hybrid Excavator Based on Common Pressure Rail

Shen

Jiang

et al. 2013

The Scientific World Journal

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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 hybrid excavator because it has high power density and environment friendly and easy to modify based on the existing manufacture process. This paper is focused on the fuel consumption of HHEC and the actuator dynamic response to assure that the new system can save energy without sacrificing performance. Firstly, we introduce the basic principle of HHEC; then, the sizing process is presented; furthermore, the modeling period which combined mathematical analysis and experiment identification is listed. Finally, simulation results show that HHEC has a fast dynamic response which can be accepted in engineering and the fuel consumption can be reduced 21% to compare the original LS excavator and even 32% after adopting another smaller engine.

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Section: Sizing Of Hhecmentioning

confidence: 99%

Energy‐Saving Analysis of Hydraulic Hybrid Excavator Based on Common Pressure Rail

Shen

Jiang

et al. 2013

The Scientific World Journal

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“…Figure 1 shows the most recognized structure of pump-displacement-controlled linear actuator designed by Ivantysynova and colleagues. [12][13][14] A swash plate variable pump is used as the main control element. Usually, the pump is driven by a diesel engine running at certain speed.…”

Section: Pump-displacement-controlled Linear Actuatorsmentioning

confidence: 99%

“…The drawback is that the system dynamic response is very slow and the tracking error is too large. 12 To improve the control quality, a new item named feed-forward compensation is added to the conventional PI algorithm. This item is based on the mathematic model of the displacement adjustment mechanism.…”

Section: Controller Design Based On Pi Algorithm With Feed-forward Comentioning

confidence: 99%

“…[9][10][11] For a pump-controlled system, the position and velocity of the actuators are controlled by adjusting the pump displacement only. As the dynamic characteristic of the pump displacement adjustment mechanism is different from that of the valve-controlled system, [12][13][14] oscillation of the actuators is observed while using the conventional proportional-integral (PI) controller which is widely used on valve-controlled system. This drawback has limited the application of the high-efficiency pumpcontrolled system.…”

Section: Introductionmentioning

confidence: 99%

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Research on hydraulic pump displacement control using PI and feed-forward compensation

Song

Wang

Ren³

et al. 2017

Advances in Mechanical Engineering

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The pump-displacement-controlled actuator offers a very promising alternative and energy-saving solution for many applications in construction machines. It has proven to be with high fuel economy by eliminating the metering losses associated with hydraulic valves. However, actuator oscillation is observed while working with fluctuated velocity or dynamic loads due to slow dynamic response and low tracking accuracy of the pump-controlled actuator. To improve control quality, a new proportional-integral algorithm combined with feed-forward compensation is put forward in this article. Based on the analysis of the swash plate adjustment mechanism, the state-space equation is established. And then, simulation and experimental studies were carried out. Both simulation and experimental results show that the new controller based on proportional-integral algorithm with feed-forward compensation achieves higher dynamic response and tracking accuracy than the conventional proportional-integral controller. And the actuator oscillation is eliminated.

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“…Li et al [12] proposed a control strategy for a hybrid excavator that combines a hydraulic accumulator and an electric regeneration unit. Zimmerman et al [13] dealt with the optimal control for a hybrid excavator with multi-actuator displacement controlled system using a state space model to apply dynamic programming (DP) algorithm; a rule-based control strategy was created to replicate the optimal control [14] exploiting a methodology for the control definition similar to that proposed by the authors. Gong et al [15] introduced on a hybrid excavator a control strategy based on equivalent fuel consumption optimizing the power distribution and the ultra-capacitor working conditions.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

et al. 2016

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Recent demands to reduce pollutant emissions and improve energy efficiency have driven the implementation of hybrid solutions in mobile machinery. This paper presents the results of a numerical and experimental analysis conducted on a hydraulic hybrid excavator (HHE). The machinery under study is a middle size excavator, whose standard version was modified with the introduction of an energy recovery system (ERS). The proposed ERS layout was designed to recover the potential energy of the boom, using a hydraulic accumulator as a storage device. The recovered energy is utilized through the pilot pump of the machinery which operates as a motor, thus reducing the torque required from the internal combustion engine (ICE). The analysis reported in this paper validates the HHE model by comparing numerical and experimental data in terms of hydraulic and mechanical variables and fuel consumption. The mathematical model shows its capability to reproduce the realistic operating conditions of the realized prototype, tested on the field. A detailed energy analysis comparison between the standard and the hybrid excavator models was carried out to evaluate the energy flows along the system, showing advantages, weaknesses and possibilities to further improve the machinery efficiency. Finally, the fuel consumption estimated by the model and that measured during the experiments are presented to highlight the fuel saving percentages. The HHE model is an important starting point for the development of other energy saving solutions.

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Optimal Control for the Series-Parallel Displacement Controlled Hydraulic Hybrid Excavator

Cited by 19 publications

References 0 publications

Energy‐Saving Analysis of Hydraulic Hybrid Excavator Based on Common Pressure Rail

Energy‐Saving Analysis of Hydraulic Hybrid Excavator Based on Common Pressure Rail

Research on hydraulic pump displacement control using PI and feed-forward compensation

Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

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