Electronically Controlled Air Suspension (ECAS) for Commercial Vehicles

1991 ◽  
Author(s):  
Karl-H. Schonfeld ◽  
Hartmut Geiger ◽  
Karl-H. Hesse
Keyword(s):  
Commercial Vehicles ◽  
Air Suspension ◽  
Electronically Controlled Air Suspension

Electronic Control Unit Design of Electronically Controlled Air Suspension (ECAS) for Vehicle Based on Freescale Microcontroller

2014 ◽  
Vol 494-495 ◽  
pp. 242-245
Author(s):  
Xin Qiang Liu ◽  
Tian Yi Yan
Keyword(s):  
Ride Comfort ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Automotive Electronics ◽  
Electronic Control ◽  
Hardware System ◽  
Air Suspension ◽  
Signal Collection ◽  
Basic Ideas ◽  
Electronically Controlled Air Suspension

With the development of automotive electronics industry, the car which has electronically controlled air suspension is gained wide application. we designed an electronic control unit of automobile electronically controlled air suspension system (ECAS) including the hardware system which include the speed signal collection and processing circuit, the solenoid valve drive circuit, the CAN communication design, height detection circuit, Freescale microcontroller etc and the control strategy while propose some the basic ideas, based on Freescale microcontroller, after introducing the composition and the principle of electronically controlled air suspension. The ECAS can improve vehicle fuel economy, ride comfort and traffic-ability.

A novel tripped rollover prevention system for commercial trucks with air suspensions at low speeds

2017 ◽  
Vol 232 (11) ◽  
pp. 1516-1527 ◽  
Author(s):  
Haitao Ding ◽  
Amir Khajepour ◽  
Yanjun Huang
Keyword(s):  
Road Safety ◽  
Commercial Vehicles ◽  
Dynamics Model ◽  
Air Spring ◽  
Severe Injuries ◽  
Low Speed ◽  
Suspension Systems ◽  
Rollover Prevention ◽  
Air Suspension ◽  
Prevention System

This paper presents a novel system to avoid tripped rollovers at low-speed operations for commercial vehicles with air suspension systems. This is of particular significance since truck rollovers have become a serious road safety problem, which usually lead to severe injuries and fatalities. Several active anti-rollover systems have been proposed in the past two decades; however, most of them focus on untripped rollover prevention instead of the tripped rollovers. Up to now, very few pieces of literature discuss the approaches that are used to avoid tripped rollovers of trucks. Furthermore, the air suspension is widely used for commercial vehicles, thus it provides an opportunity to prevent rollovers when properly manipulated. Therefore, a novel tripped rollover prevention system is proposed for trucks at low-speed operations with air suspensions. A roll dynamics model with an air spring is built to investigate the dynamic behavior and the time response of the whole system. More importantly, the feasibility of this new anti-rollover system is discussed and verified by the co-simulations in TruckSim and MATLAB/Simulink under two possible tripped rollover conditions.

The Research of Height Control Strategy of the Electronically Controlled Air Suspension

2013 ◽  
Vol 288 ◽  
pp. 156-160
Author(s):  
Jin Rui Nan ◽  
Zhi Chai ◽  
Jun Kui Huang
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Can Bus ◽  
Nonlinear Process ◽  
Solenoid Valve ◽  
Target Height ◽  
Height Control ◽  
Air Suspension ◽  
Electronically Controlled Air Suspension ◽  
Valve Control

The height adjustment of electronically controlled air suspension is a complicated nonlinear process [1]. To research this problem, the height adjustment principle of ECAS is introduced first, and the functions of important components of the system are also listed. Then we put forward height control strategy and the pulse width of the solenoid valve control method, which are applied to the control method of ECU. After that, we use the software Labview to communicate with the ECU through CAN bus. By analyzing the data collected, we can see that the results show that current height and target height are consistent generally and the control strategy is feasible.

Research on Ultrasonic Height Sensor for Electronically Controlled Air Suspension

2013 ◽  
Vol 753-755 ◽  
pp. 2126-2130
Author(s):  
Jian Hua Wang ◽  
Yun Cheng Wang ◽  
Fei Xie ◽  
Xing Han
Keyword(s):  
Real Time ◽  
Echo Signal ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Air Suspension ◽  
Electronically Controlled Air Suspension

The height sensor based on ultrasonic uses the ultrasonic characteristics to make real-time analysis of the echo signal to get the change of distance. By improving the precision of ultrasonic height sensor, it can be used in the air suspension to calculate the deformation of suspension more accurately, which can help to improve vehicle running smoothness and handling stability.

scholarly journals Nonlinear adaptive sliding-mode control of the electronically controlled air suspension system

2019 ◽  
Vol 16 (5) ◽  
pp. 172988141988152
Author(s):  
Bai Rui
Keyword(s):  
Sliding Mode Control ◽  
Control Method ◽  
Sliding Mode ◽  
Adaptive Sliding Mode Control ◽  
Parameter Uncertainties ◽  
Nonlinear Dynamical ◽  
Adaptive Sliding Mode ◽  
Mode Control ◽  
Air Suspension ◽  
Electronically Controlled Air Suspension

Recent years, electronically controlled air suspension has been widely used in vehicles to improve the riding comfort and the road holding ability. This article presents a new nonlinear adaptive sliding-mode control method for electronically controlled air suspension. A nonlinear dynamical model of electronically controlled air suspension is established, where the nonlinear dynamical characteristic of the air spring is considered. Based on the proposed nonlinear dynamic model, an adaptive sliding-mode control method is presented to stabilize the displacement of electronically controlled air suspension in the presence of parameter uncertainties. Parameter adaptive laws are designed to estimate the unknown parameters in electronically controlled air suspension. Stability analysis of the proposed nonlinear adaptive sliding-mode control method is given using Lyapunov stability theory. At last, the reliability of the proposed control method is evaluated by the computer simulation. Simulation research shows that the proposed control method can obtain the satisfactory control performance for electronically controlled air suspension.

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