Key Takeaways & Executive Findings
- •• A comprehensive nonlinear model of electro-hydraulic power-shift systems incorporating pipeline characteristics was developed and validated experimentally, showing high accuracy. • The model including pipeline parameters aligns more closely with experimental data than models without, highlighting the importance of pipeline effects. • Damping coefficient, feedback cavity orifice diameter, and pipeline length critically affect system stability, while spring stiffness has minimal impact. • The findings provide practical insights for optimizing electro-hydraulic control modules in intelligent chassis systems for automotive and construction machinery.
Abstract
This research presents an advanced study on the modeling and stability analysis of electro-hydraulic control modules used in intelligent chassis systems. Firstly, a comprehensive nonlinear mathematical model of the electro-hydraulic power-shift system is developed, incorporating pipeline characteristics through impedance analysis and examining coupling effects between the pilot solenoid valve, main valve, and pipeline. Then, the model's accuracy is validated through experimental testing, demonstrating high precision and minimal model errors. A comparative analysis between simulation data (both with and without pipeline characteristics) and experimental results reveals that the model considering pipeline parameters aligns more closely with experimental data, highlighting its superior accuracy. The research further explores the influence of key factors on system stability, including damping coefficient, feedback cavity orifice diameter, spring stiffness, pipeline length, and pipeline diameter. Significant findings include the critical impact of damping coefficient, orifice diameter, and pipeline length on stability, while spring stiffness has a minimal effect. These findings provide valuable insights for optimizing electro-hydraulic control modules in intelligent chassis systems, with practical implications for automotive and construction machinery applications.
1. Introduction
The development of intelligent chassis systems represents a significant advancement in automotive engineering, aiming to enhance vehicle performance, safety, and comfort through sophisticated control mechanisms. Electro-hydraulic systems combine hydraulic and electrical technologies to provide precise control and improved performance over traditional hydraulic systems. The fundamental principle involves using electrical signals to control hydraulic actuators, which in turn regulate fluid flow and pressure in response to system demands. These systems are integral to modern automotive applications, such as automated transmissions [1–3], advanced suspension systems [4], brake systems [5] and steering systems [6, 7], where they offer significant improvements in response time, accuracy, and reliability.
Among the critical actuators facilitating automatic control, the electro-hydraulic power-shift system (EHPSS) has emerged as a focal point due to its substantial impact on actuator performance [8]. To meet the requirements for high power, rapid response, and high reliability, a two-stage structure is often adopted in EHPSS for high-power electro-hydraulic shifting systems, such as those used in wet clutches [9, 10]. This configuration typically consists of a high-speed pilot solenoid valve, an amplifier-stage main valve, and an oil pipeline [11, 12]. Despite extensive research efforts aimed at improving the system's response characteristics, fully understanding the detailed working mechanisms of EHPSS remains challenging.
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Fei Meng, Yanfei Ren, Junqiang Xi (2025). Advanced Modeling and Stability Analysis of Electro-Hydraulic Control Modules for Intelligent Chassis Systems. Chinese Journal of Mechanical Engineering. https://doi.org/10.1186/s10033-025-01339-y
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Frequently Asked Questions
What is the main focus of this research?
The research focuses on advanced modeling and stability analysis of electro-hydraulic control modules used in intelligent chassis systems, particularly the electro-hydraulic power-shift system (EHPSS).
How was the model validated?
The model was validated through experimental testing, demonstrating high precision and minimal model errors. Comparative analysis showed that the model including pipeline parameters aligns more closely with experimental data.
What are the key factors affecting system stability?
The study found that damping coefficient, feedback cavity orifice diameter, and pipeline length critically impact stability, while spring stiffness has minimal effect.
What are the practical implications of this research?
The findings provide valuable insights for optimizing electro-hydraulic control modules in intelligent chassis systems, with practical applications in automotive and construction machinery.
What is the significance of incorporating pipeline characteristics?
Incorporating pipeline characteristics through impedance analysis improves model accuracy, as the model with pipeline parameters aligns more closely with experimental data than models without.
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