Braking Torque Characteristics of Hydrodynamic Retarder Using Pressure Tank During Dynamic Oil-filling

doi:10.12382/bgxb.2024.1086

Abstract

Abstract:

Hydrodynamic retarder plays a key role in the driving assist braking system,and the main challenge it faces is the problem of rapid response and accurate prediction of braking torque.To achieve rapid onset,a pressure tank is used to accelerate oil-filling for a heavy equipment,but the changes in tank pressure and wheel speed during the oil-filling process will dynamically affect the filling flow rate and braking torque.Therefore,this paper constructs a prediction model for the oil-filling process of the hydraulic retarded braking system considering the pressure tank,realizes the two-way dynamic update of the boundary conditions of flow parameters at the inlet and outlet of wheel cavity,and deeply explores the hydrodynamic-hydraulic coupling relationship between the wheel cavity system and the charging and discharging control system.The simulated and experimental results show that the prediction error of the proposed model for peak torque is 15.61%,and the response time error is 15.04%,which verifies that the proposed model is capable of effectively exploring the braking characteristics of hydraulic retarder under the condition of fuel supply from the pressure tank for actual vehicle.The influence of the pressure tank characteristics on the braking torque characteristics at a given inertia and initial speed is further analyzed,and the regulation mechanism of the pressure tank parameters on the dynamic process of oil-filling is clarified.

Key words: hydrodynamic retarder, dynamic oil-filling process, braking torque, pressure tank, hydrodynamic and hydraulic characteristic coupling

CLC Number:

U463.53⁺3

WEI Wei, JIA Leilei, KE Zhifang, SI Lurong, TAO Tianlang, MA Yuanqing, YAN Qingdong. Braking Torque Characteristics of Hydrodynamic Retarder Using Pressure Tank During Dynamic Oil-filling[J]. Acta Armamentarii, 2025, 46(9): 241086-.

Figures/Tables 22

Fig.1 Dynamic viscosity and density of oil as a function of temperature

Table 1 The number of meshes with different densities

网格尺寸/mm	1	2	3	4	5
网格数量/10⁶	18.5	7.06	5.23	4.26	3.89

Fig.2 Analized results of grid independence

Fig.3 Working principle of pressure tank

Fig.4 AMESim model of separate pressure tank

Fig.5 CFD model of individual pressure tanks

Fig.6 Comparison of AMESim and CFD models for a separate pressure tank

Fig.7 CFD model of a separate pressure tank with a two-phase distribution of oil

Fig.8 Fflow channel models of hydrodynamic retarder and inlet butterfly valve

Fig.9 Butterfly valve opening-differential pressure flow characteristics

Fig.10 Pressure tank-hydraulic retarder co-simulation model

Fig.11 Schematic diagram of experimental bench

Table 2 Experimental instruments and equipment

序号	仪器名称	数量
1	液压泵站	1
2	电气控制柜与采集系统	1
3	扭矩仪	3
4	惯性飞轮组	2
5	气泵	1

Fig.12 Comparison of braking characteristics of hydraulic retarder for pressure tank oil supply

Fig.13 Comparison of braking torques at constant current inlet and dynamic inlet

Fig.14 Constant flow inlet flow vs.dynamic inlet flow

Fig.15 Comparison of filling rates of constant flow inlet and dynamic inlet

Fig.16 Pressuresin the front and back of filling valve at different initial pressures

Fig.17 Change in inlet flow at different initial pressures

Fig.18 The influence of initial pressure in the pressure tank on the braking torque

Fig.19 Change in pressure tank pressure under different initial oil-filling rates

Fig.20 The influence of the initial oil-filling rate of pressure tank on the braking torque

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