Modeling and Characteristics Research of Proportional-Valve Hydraulic Power Steering of Commercial Vehicle

2013 ◽  
Vol 765-767 ◽  
pp. 357-360
Author(s):  
Guo Qing Geng ◽  
Hao Bin Jiang ◽  
Jia Yin Dong ◽  
Tao Jiang ◽  
Tao Liu
Keyword(s):  
High Speed ◽  
Response Characteristic ◽  
Steering Wheel ◽  
Vehicle Speed ◽  
Bypass Flow ◽  
Hydraulic Power ◽  
Proportional Valve ◽  
Low Speed ◽  
Power Steering ◽  
Hydraulic Power Steering

Dynamics model of mechanical system and hydraulic system inclued electro-hydraulic proportional valve of Proportional-Valve Hydraulic Power Steering were established.and simulation model of assisted characteristic of PVHPS system was build .Response characteristic of proportional valve bypass flow was analyzed at different speed, and higher of the speed, greater of the flow in the bypass flow is . Steering wheel torque increases gradually as vehicle speed increases at the same wheel angle, and driver's better steering road feeling can be ensured. As wheel steering torque increases, assisted oil pressure increases and higher the speed is , slowly oil pressure increases, and assisted oil pressure increases quickly at low-speed steering condition, and increases slowly at high-speed condition,which meet the requirement of low-speed steering agility and high-speed road feeling.

Design of Traditional Hydraulic Steering System with Variable Power

2014 ◽  
Vol 644-650 ◽  
pp. 755-758
Author(s):  
Jie Li ◽  
Jian Tong Song ◽  
Li Hong Wang ◽  
Jv Biao Yao
Keyword(s):  
High Speed ◽  
Steering System ◽  
Vehicle Speed ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Characteristics ◽  
Power Steering ◽  
Hydraulic Steering ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering

Conventional hydraulic steering system has the problems of "low-speed heavy, high-speed flight" and energy-wasting when steering, the main reason is after the system is designed, the power characteristics are fixed. To solve this problem it is necessary to achieve the power characteristics of changing power steering system according to speed of vehicles, in order to offer the power that matches the speed. Using vehicle speed sensor signal to control pilot solenoid unloading valve to regulate the pressure of hydraulic system, can achieve the regulation of power characteristics, this article is based on such idea to design variable hydraulic power steering system for hydraulic power steering system of light trucks.

Simulation on Displacement Characteristics of Variable Displacement of Double-Action Vane Pump

2010 ◽  
Vol 152-153 ◽  
pp. 1088-1091
Author(s):  
Lei Chen ◽  
Pan Zhang
Keyword(s):  
Simulation Model ◽  
High Speed ◽  
Steering System ◽  
Vane Pump ◽  
Hydraulic Power ◽  
Power Steering ◽  
Simulink Simulation ◽  
Variable Displacement ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering

On of the practical difficulties of high speed automotive hydraulic power steering is that the output exceeds the actual demands of the system, i.e., there is a substantial power loss. This paper discusses the configuration and the action principle of a new variable displacement of double-action vane pump, which consists of floating blocks. The pump belongs to an automotive hydraulic power steering system, and prosperous utilization is expected. In the meantime the mathematical and simulation model for hydraulic power steering of automobile were established and the Matlab Simulink simulation model was presented. Different parameters of pump are selected in simulating programming. The simulating results are analyzed and compared.

Development of a Hydraulic Power Steering Check Valve to Reduce Backpressure and Improve Steering Wheel Kick

2009 ◽  
Author(s):  
Davi Janini Ursolino ◽  
Gustavo Matucci Hage ◽  
Ricardo Pereira Silva ◽  
Samuel Lopes Souza ◽  
Fernando Pan
Keyword(s):  
Check Valve ◽  
Steering Wheel ◽  
Hydraulic Power ◽  
Power Steering ◽  
Hydraulic Power Steering

Model and Dynamic Characteristics of Electromagnetic Split Clutch for Hydraulic Power Steering Application

2014 ◽  
Vol 644-650 ◽  
pp. 759-762 ◽  
Author(s):  
Bin Tang ◽  
Hao Bin Jiang ◽  
Guo Qing Geng
Keyword(s):  
High Speed ◽  
Mathematic Model ◽  
Steering System ◽  
Hydraulic Power ◽  
Current Output ◽  
Power Steering System ◽  
Power Steering ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering ◽  
Speed Characteristic

In order to improve bus drivers’ high-speed road feel and reduce parasitic loss of hydraulic power steering system (HPS), a novel power steering system is proposed, which is characterized by an electromagnetic slip clutch (ESC) which regulates discharge flow of steering pump to realize variable assist characteristics as well as uniquely transfers on-demand power from ICE to steering pump. The mathematic model of ESC including flux linkage equations, voltage equations, electromagnetic torque equation and kinematic equations under synchronous rotating coordinate system (d-q coordinate) is constructed. Dynamic characteristic, mechanical characteristic, input-output characteristic and excited current-output speed characteristic of ESC are simulated. Finally, the experiment of ESC is implemented. The consistence of simulation results and experiment results indicate correctness and precision of the model.

Development and Application Road Testbench on Vehicle Hydraulic Power Steering System

2014 ◽  
Vol 490-491 ◽  
pp. 1018-1022
Author(s):  
Yong Chen
Keyword(s):  
Angular Velocity ◽  
Data Gathering ◽  
Steering System ◽  
Steering Wheel ◽  
Hydraulic Pressure ◽  
Time Data ◽  
Hydraulic Power ◽  
Power Steering ◽  
Operation Parameters ◽  
Hydraulic Power Steering

In order to study operation characteristic of the hydraulic power steering (HPS) system, a data gathering system, based on the testbench, was designed to test HPS system operating on-road. By using various kinds of sensors, such as hydraulic pressure, fluid flow rate, steering torque, corner angle, angular velocity, vehicle speed, gyro sensors and so on, convert steering wheel angle, angular velocity, torque and other operation parameters into analog voltage signals, which provided to real-time data acquisition, storage and analysis. 11 physical quantities can be tested simultaneously, including steering system and operation parameters of vehicles. Different angular velocity of steering wheel speed and "S" shape road were tested on different vehicle speeds, and the result shows that the tests are in accordance with theoretical analysis, which proves the data gathering system's credibility.

Research on Variable Steering Ratio of Vehicle Steer-by-Wire System Based on Joystick

2013 ◽  
Vol 336-338 ◽  
pp. 1037-1040 ◽  
Author(s):  
Hong Yu Zheng ◽  
Bing Yu Wang ◽  
Chang Fu Zong
Keyword(s):  
High Speed ◽  
Control Algorithm ◽  
Steering Wheel ◽  
Vehicle Speed ◽  
Vehicle Model ◽  
Steering Angle ◽  
Low Speed ◽  
Steer By Wire ◽  
Wire System

In the steer by wire system of vehicle, a joystick can instead of the steering wheel. A control algorithm based on variable steering ratio is developed on the basis of vehicle speed and joystick steering angle. By verifying the control algorithm with the vehicle model from CarSim, it shows that this proposed algorithm can effective carry out steering intention of drivers, which enhance the steer comfort in low speed driving and steer handling in high speed driving and effectively improve the vehicle maneuverability.

A Semi-Physical Model of a Hydraulic Power Steering System for Vehicle Dynamics Simulations

2006 ◽  
Author(s):  
Federico Cheli ◽  
Elisabetta Leo ◽  
Edoardo Sabbioni ◽  
Andrea Zuin
Keyword(s):  
Steering System ◽  
Steering Wheel ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Steering ◽  
The Difference ◽  
Steering Torque ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering ◽  
Reaction Torque

A semi-physical model of an hydraulic power steering system is presented in this paper. The proposed model allows to evaluate the wheels dynamic response to steering inputs and to calculate the corresponding reaction torque on the steering-wheel (steering torque). The analyzed steering system increases its stiffness (so that the steering assist level is decreases) with the rise of the vehicle speed. Thus, vehicle maneuverability is improved during parking maneuvers, while at high vehicle speeds, stability and driver perceived steering feel are ensured. A two d.o.f. (steering-wheel and rack-pinion rotations) model has been implemented during this study. The model parameters have been identified through the standard laboratory tests carried out to characterize a steering system, minimizing the difference between the experimental data and the model numerical results. During laboratory tests the hydraulic power system has been characterized first, measuring its stiffness variation as a function of the relative rotation between the steering-wheel and the rack-pinion, and the steering torque as a function of the difference between the delivery and the reversal pressure of the double-acting ram. The complete steering system has been then characterized, suspending the vehicle and placing the wheels on appropriate low-friction plates which permit them to turn; sine and frequency sweep steering input have been applied by a robot and the corresponding reaction torque on the steering-wheel has been measured. Simulations results are in good agreement with the experimental ones for all the performed tests. The steering system model has been integrated into a 14 d.o.f. vehicle model developed by the Mechanical Department of the Politecnico di Milano in order to access its reliability during handling maneuvers. Several simulations have been performed both in open (step-steer, steering pad, etc.) and in closed loop (lane change, double lane change, slalom, etc). Simulation results have shown a reduction of the toe angle due to the deformability of the steering system and a time delay of the wheel angle respect to the cinematic condition introduced by the steering system dynamics. The reaction torque on the steering-wheel has also been calculated during the simulations to access the driver perceived steering feel during the maneuvers.

Electric Hydraulic Power Steering System Simulation Study

2013 ◽  
Vol 373-375 ◽  
pp. 154-157
Author(s):  
Jun Wang ◽  
Li Chao Xu
Keyword(s):  
Control Strategy ◽  
Steering System ◽  
Vehicle Speed ◽  
Motor Speed ◽  
Rotary Valve ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Steering ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering

Properly controlling electro hydraulic power steering system can improve steering performance. The relation of motor speed, vehicle speed and steering speed is gained, according to the influence of motor speed on the steering performance. The force and angle input is set in the driver input model. Rotary valve is simulated by four orifices. The steering resistance between tire and ground is simulated by the coulomb friction on two tips of the rack. The method of double closed-loops PID is used to control the motor. The influence of the control strategy on the steering performance is realized by the simulations of three typical situation, which includes steering portability, road feel, the speed of assist force response and its stability. The results of simulation validate the availability of the control strategy, which is the basic of optimization.

Matching Design of Assist Characteristic for Electric Hydraulic Power Steering System of Electric Bus

2013 ◽  
Vol 427-429 ◽  
pp. 235-240 ◽  
Author(s):  
Guo Biao Shi ◽  
Jin Long Cui ◽  
Peng Gu
Keyword(s):  
Characteristic Curve ◽  
Steering System ◽  
Steering Wheel ◽  
Vehicle Speed ◽  
Power Steering ◽  
Electric Bus ◽  
Relationship Of ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering ◽  
The Relationship

Electric hydraulic power steering system (EHPS) has the characteristics of high energy efficiency and reliability. In this paper, we focus on the design and analysis of assist characteristic for EHPS of electric bus. The relationship of steering assist power, steering wheel torque and steering resisting torque was analyzed; steering system model and vehicle dynamic model were built. By EHPS simulation, the relationship of pump flow rate, steering wheel angular velocity and vehicle speed was deduced and 3-D assist characteristic curve map was plotted, which was suitable for electric bus. In order to apply the assist characteristic curve into practice, we optimized the curve through BP neural network, and then obtained the assist power value under any vehicle speed and steering wheel angular velocity. Finally, EHPS simulation verified the optimized assist characteristic curve having a good performance.

Energy Analysis for Electric Hydraulic Power Steering System of Electric Bus

2014 ◽  
Vol 610 ◽  
pp. 164-168
Author(s):  
Guo Biao Shi ◽  
Shuai Wang ◽  
Peng Gu ◽  
Huan Xin Xie ◽  
Yi Lin
Keyword(s):  
High Speed ◽  
Characteristic Curve ◽  
Steering System ◽  
Small Displacement ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Steering ◽  
Electric Bus ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering

Electric hydraulic power steering system (EHPS) is an on-demand power steering system that uses a small displacement and high speed electric pump. By optimizing the assist characteristic curve, EHPS can save energy more significantly than traditional hydraulic power steering system. After overview of the energy saving principle for EHPS system, the energy consumption of the EHPS system is elaborated, and the energy loss of the mechanical, electrical, hydraulic subsystems is analyzed. Finally, targeted measures are proposed for energy conservation.

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