Skid-Proof Operation of Wheel Loader Based on Model Prediction and Electro-Hydraulic Proportional Control Technology

Bingwei Cao,Peng Tan,Xinhui Liu,Kuo Yang,Wei Chen

doi:10.1109/access.2019.2961364

Bingwei Cao, Peng Tan + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2961364

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Abstract

Wheel loader shovel loading operation tests showed that when the tire slips, it not only causes waste of the engine power, but also increases the tire wear. In this paper, the regression prediction model is combined with the electro-hydraulic proportional control technology. For the first time, the method of adjusting the posture of the working device is proposed to realize the skid-proof shovel control strategy of the wheel loader. In this control strategy: (1) The electro-hydraulic proportional control technology applied to this wheel loader is introduced. (2) The load spectrum of the wheel loader is analyzed during the shovel loading operation. Moreover, combined with the drive shaft torque, pilot pressure and boom cylinder displacement, the particle swarm optimization-support vector machine (PSO-SVM) algorithm is used to complete the construction of the regression prediction model of the boom cylinder displacement. (3) A controller is designed based on the fractional-order PID control algorithm. The skid-proof control strategy is simulated and verified by constructing the joint simulation model. The corresponding program is prepared in the hydraulic system controller and the effectiveness of the control strategy and algorithm are verified by the wheel loader shovel loading operation.

Highlights

Wheel loaders are commonly used for material excavation, loading and short-distance transportation in engineering construction and mining
Combined with the drive shaft torque, pilot pressure and boom cylinder displacement, the particle swarm optimization-support vector machine (PSO-SVM) algorithm is used to complete the construction of the regression prediction model of the boom cylinder displacement
The corresponding program is prepared in the hydraulic system controller and the effectiveness of the control strategy and algorithm are verified by the wheel loader shovel loading operation

Summary

INTRODUCTION

Wheel loaders are commonly used for material excavation, loading and short-distance transportation in engineering construction and mining. It should be indicated that the wheel loader of the present study uses electro-hydraulic proportional control technology to realize the action of the working device through the electromagnetic proportional pressure reducing valve. This paper firstly proposes a skid-proof shovel loading function of the wheel loader This function uses the electrohydraulic proportional technology as the carrier to control the on/off of the electromagnetic proportional pressure reducing valve through the regression prediction model of the displacement of the boom cylinder, thereby changing the posture of the working device. The main control valve adopts an internal oil circuit in parallel form, which can realize the joint operation of the boom and the bucket

SIMULATION MODEL

DATA PREDICTION MODEL

REGRESSION PREDICTION

Findings

CONCLUSION