Hierarchical Model Predictive Control for Hydraulic Hybrid Powertrain of a Construction Vehicle

Zhong, Wang; Jiao, Xiaohong

doi:10.3390/app10030745

Cited by 6 publications

(6 citation statements)

References 25 publications

(37 reference statements)

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“…Liu et al proposed an improved equivalent fuel consumption minimization strategy (ECMS) for a hybrid electric vehicle, where the fuel economy can be improved by adjusting the engine operating point to a high-efficiency zone during the acceleration process [14]. In terms of the adaptive control strategy, Wang et al presented a stochastic model predictive control (SMPC)-based energy management, to improve the operating points distribution of an engine [15]. Liu et al proposed an adaptive hierarchical energy management for a PHEV, which can prevent the engine from operating in the inefficient zone while reducing the fuel consumption of the vehicle [16].…”

Section: Introductionmentioning

confidence: 99%

A Robust Design Method for Optimal Engine Operating Zone Design of Plug-in Hybrid Electric Bus

et al. 2022

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The optimal engine operating zone of energy management plays an important role in the fuel economy improvement of Plug-in hybrid electric buses. However, the existing investigations usually design the engine operating zone by experience. This paper proposes a robust design method for the robust and optimal design of the engine operating zone. Firstly, a nonlinear model predictive control (NMPC)-based energy management together with a single-point preview SOC (state of charge) plan method is designed. Then, a Taguchi robust design model is designed to find the optimal engine operating zone by taking the energy management as underlying solving module. Particularly, the noises of driving cycles and stochastic vehicle mass are considered to improve the robust performance of the engine operating zone. Finally, The Monte Carlo Simulation is deployed to verify the robustness and optimal performances of the designed engine operating zone. Simulation results demonstrate that the proposed method is beneficial to the fuel economy improvement, where the fuel economy can be averagely improved by 9.10% compared with the experienced designed engine operating zone, and can be averagely improved by 16.34% compared with the rule-based energy management strategy.

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Section: Introductionmentioning

confidence: 99%

A Robust Design Method for Optimal Engine Operating Zone Design of Plug-in Hybrid Electric Bus

et al. 2022

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“…During these untrained evaluation cycles the NN controller was able to decrease average fuel consumption by 25.8 % when compared to a baseline constant pressure control strategy. Wang and Jiao 21 a hierarchical model predictive control (MPC) scheme is presented in this paper using the example of a spray-painting construction vehicle. The upper layer is a stochastic MPC (SMPC) based energy management control strategy (EMS) and the lower layer is an MPC-based tracking controller with disturbance estimator of the diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Energy management strategy for hydraulic hybrid system with compound accumulator based on dynamic programming

Tang

Xie

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The compound accumulator is an energy storage device composed of one large accumulator and one small accumulator. Compared with traditional single-accumulator hydraulic hybrid vehicles, hydraulic hybrid vehicles based on compound accumulator can switch the working timing of large and small accumulators according to the characteristics of different working conditions, more braking energy can be recovered on the premise of providing enough braking strength. This article is aimed at hydraulic hybrid vehicles based on compound accumulator. First, the key components of the hydraulic system were matched, then according to the engine fuel consumption curve, the engine’s high-efficiency work area is divided, and formulated a rule-based energy management strategy based on the principle of adjusting the engine to work in a high-efficiency area. The internal pressure of the compound accumulator is selected as the state variable, the ratio of the torque of the hydraulic pump/motor to the required torque of the vehicle is the control variable, and the optimal fuel economy of the entire cycle is the objective function, and the mathematical model is established using the dynamic programming algorithm, and compiled a program in MATLAB to obtain the optimal torque distribution relationship between the engine and the hydraulic pump/motor and the optimal working timing of the large and small accumulators. Simulation results show that compared with the traditional hydraulic hybrid vehicle with single accumulator based on initial rules and the hydraulic hybrid vehicle with compound accumulator based on initial rules, the hybrid vehicle with compound accumulator based on improved rules can save fuel by 11.84[Formula: see text] and 5.96[Formula: see text] respectively. The fuel saving potential of the compound accumulator structure and the effectiveness of the improved rule control strategy based on dynamic programming algorithm are verified.

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“…The design, assembly and testing of the system prototype showed that the efficiency of the system was improved accordingly and that the proposed method was feasible. Wang et al [13] combined the high energy density of hydraulic accumulators and designed a strategy to improve fuel economy. The results show that the average fuel consumption per gallon of the proposed strategy, compared with the rule-based control strategy and the proportional integral derivative controller-based control strategy, increased by 7.3% and 5.9%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Research on the Starting Acceleration Characteristics of a New Mechanical–Electric–Hydraulic Power Coupling Electric Vehicle

et al. 2020

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To simplify the layout of a purely electric vehicle transmission system and improve the acceleration performance of the vehicle, this paper utilizes the characteristics of the large torque of a hydraulic transmission system and proposes a new mechanical–electric–hydraulic dynamic coupling drive system (MEH-DCDS). It integrates the traditional motor and the swashplate hydraulic pump/motor into one, which can realize the mutual conversion between the mechanical energy, electrical energy, and hydraulic energy. This article explains its working principle and structural characteristics. At the same time, the mathematical model for the key components is established and the operation mode is divided into various types. Based on AMESim software, the article studies the dynamic characteristics of the MEH-DCDS, and finally proposes a method that combines real-time feedback of the accumulator output torque with PID control to complete the system simulation. The results show that the MEH-DCDS vehicle has a starting time of 4.52 s at ignition, and the starting performance is improved by 40.37% compared to that of a pure motor drive system vehicle; after a PID adjustment, the MEH-DCDS vehicle’s starting time is shortened by 1.04 s, and the acceleration performance is improved by 23.01%. The results indicated the feasibility of the system and the power performance was substantially improved. Finally, the system is integrated into the vehicle and the dynamic performance of the MEH-DCDS under cycle conditions is verified by joint simulation. The results show that the vehicle is able to follow the control speed well when the MEH-DCDS is loaded on the vehicle. The state-of-charge (SOC) consumption rate is reduced by 20.33% compared to an electric vehicle, while the MEH-DCDS has an increased range of 45.7 m compared to the EV. This improves the energy efficiency and increases the driving range.

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Hierarchical Model Predictive Control for Hydraulic Hybrid Powertrain of a Construction Vehicle

Cited by 6 publications

References 25 publications

A Robust Design Method for Optimal Engine Operating Zone Design of Plug-in Hybrid Electric Bus

A Robust Design Method for Optimal Engine Operating Zone Design of Plug-in Hybrid Electric Bus

Energy management strategy for hydraulic hybrid system with compound accumulator based on dynamic programming

Research on the Starting Acceleration Characteristics of a New Mechanical–Electric–Hydraulic Power Coupling Electric Vehicle

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