A wheel loader is representative construction machinery that is designed to load material in off-road applications. The vehicle moves back and forth in the loading process, showing great hydraulic hybridization potential. The research target in this study is a compact wheel loader. By adding hydraulic energy storage device - hydraulic accumulator, it is turned into a series hydraulic hybrid. In this paper the system modeling and controllers design of series hydraulic hybrid wheel loader were illustrated. A tunable energy management strategy has been proposed and studied. By changing the hybrid weight factor in the strategy, the powertrain hybridization degree was adjusted without any additional hardware. This study shows that higher use of the hydraulic accumulator power indicates a higher degree of hydraulic hybridization. Results show that the series hydraulic hybrid wheel loader has a fuel saving of 18.9% compared to a hydrostatic wheel loader in the short loading cycle. Studies had also been conducted to show the trade-off between the fuel consumption and the vehicle performance with different hybridization degrees.
Bibliographical noteFunding Information:
Manuscript received February 18, 2020; revised May 18, 2020; accepted June 22, 2020. Date of publication June 30, 2020; date of current version October 22, 2020. This work was supported by the National Natural Science Foundation of China under Grants 51875509 and 91748210, in part by the NSFC-Shanxi Joint Fund under Grant U1910212, and in part by the Fundamental Research Funds for the Central Universities. The review of this article was coordinated by Dr. Feng Wang. (Corresponding author: Feng Wang.) Qunya Wen, Feng Wang, and Bing Xu are with the State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China (e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org).
- compact wheel loader
- energy management strategy
- hybridization degree
- rule-based strategy
- Series hydraulic hybrid