Development of a prototype of vehicle active suspension system
Sunday, November 09, 2014
Introduction
The aim of the project is to develop an active suspension system for vehicles. In this project, the main objective is to suppress the vibrations caused due to the imperfections of the road surface and give a better stability to the sprung mass. In order to achieve this goal, the suspension system changes its characteristics and suppress the vibrations according to the vibration level of the road and applied disturbances.Project scope
The proposed method consist of a controller, linear motor driver, linear motor acting as an actuator and feedback sensors are used to complete the control system. The controller will accumulate suppressed vibration performance details of the system and takes position feedback of the motor using a linear encoder and motor current feedback using a current sensor to provide desired output signals to the motor driver. The desired output is calculated using motor disturbance observer technique. The response of the suppressed vibration is transferred to controller using a 3D accelerometer and the controller save them for analysis. | |||
| Figure 1: Block Diagram |
The control signal then transferred into the motor drive module which provides power to linear motor USING PULSE WIDTH MODULATION. The actual current if the linear motor is measured by a current sensor using shunt resistance current measurement method. Current sensor used in between driver and linear motor to calculate the exact current transferred to motor. This measured value then used in DOB to calculate load torque. The Linear motor acts as the actuator of system, providing required dynamic suspension response to suppress vibration experienced by motor body itself. The linear motor is capable of delivering required torque and speed response directed by controller through motor driver.The Linear encoder measures the motor position and sends the position measurement to controller for system response measurement. These systems are connect as described above and as in above block diagram to provide a viable solution to our problems.
Conclusion
The effectiveness of the active suspension system with respect to prevailing passive suspension system can be observed by comparing the vibration suppression capability of the both systems in different vibration levels. The effective usage of the active suspension system can be implemented to improve the control, contact and comfort of the motor vehicles.Project Supervisor: Dr.Harsha Abeykoon
Group members: P.A.M.M.B. Abeyrathna | W.A.S.P. Abeysiriwardane | S.W. Amarasinghe | W.M.S.L. Ariyasinghe
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