Improving the Comfort of the Vehicle Based on Using the Active Suspension System Controlled by the Double‐Integrated Controller

Abstract

When the vehicle moves on the road, many external factors affect the vehicle. These effects can cause oscillation and instability for the vehicle. The oscillation of the vehicle directly affects the safety and comfort of passengers. The suspension system is used to control and extinguish these oscillations. However, the conventional passive suspension system is unable to fully meet the vehicle’s requirements for stability and comfort. To improve these problems, these are much modern suspension system models that have been used in the vehicle to replace the passive suspension system. The modern suspension systems are used as the air suspension system, semiactive suspension system, and active suspension system. These systems which are controlled automatically by the controller were established based on the control methods. There are a lot of control methods which are used to control the operation of the active suspension system. These methods have their advantages and disadvantages. Almost, conventional control methods such as PID, LQR, or SMC are commonly used. However, they do not provide optimal efficiency in improving a vehicle’s oscillation. Therefore, it is necessary to establish a novel solution for the active suspension system control to improve the vehicle’s oscillation. In this paper, the method of using the double-integrated controller is proposed to solve the above problem. The double-integrated controller consists of two hydraulic actuators which are controlled completely separately. This is a completely novel and original method that can provide positive effects. This research focuses on establishing, simulating, and evaluating the novel control method (the double-integrated control) for the active suspension system. The results of the research have shown that when the vehicle is equipped with the active suspension system which is controlled by the double-integrated controller, the maximum values of displacement and acceleration of the sprung mass are significantly reduced. They reach only 6.25% and 9.10% (case 1) and 6.00% and 6.12% (case 2) compared to the conventional passive suspension system. Besides, its average values which are calculated by RMS are only about 3.91% and 4.67% (case 1) and 4.48% and 4.77% (case 2) compared to the above case. Therefore, the comfort and stability of the vehicle have been improved. This paper provides new concepts and knowledge about the double-integrated control method which will become the trend to be used in the next time for the systems of the vehicle. In the future, experimental procedures also need to be conducted to be able to more accurately evaluate the results of this research.

Advance the Efficiency of an Active Suspension System by the Sliding Mode Control Algorithm With Five State Variables

“…The change in pressure is a complex multivariable function. According to [14]: Taking the derivative of both sides of ( 5), the equation for determining the impact force is linearized as follows:…”

“…Besides, equipping two hydraulic actuators which control two objects separately also provides higher stability than other cases. This was pointed out in Nguyen's article [14]. However, the PID algorithm only applies to the SISO system.…”

LQR Control with the New Triple In-Loops Algorithm for Optimization of the Tuning Parameters

“…In many situations, the conventional linear controller is not able to meet the vehicle's stability requirements. Therefore, Nguyen proposed the use of doubleintegrated controllers for each side of the suspension system [13]. According to his paper, two PID controllers take care of two different objects, including displacement and acceleration of the sprung mass.…”

Suspension System Control Based on Type‐2 Fuzzy Sliding Mode Technique

“…In this article, MATLAB software version 2019a has been used to model the suspension system and implement the proposed control system. e values of the parameters used for the suspension system are listed in Table 1 [7]. Plus, the initial values of the controller parameters are chosen as λ 1 1, λ 2 6, λ 3 6, λ 4 10,…”

“…An active suspension system could adapt itself to different conditions of the road and decreases displacement and acceleration of the vehicle body simultaneously [5,6]. A lot of research has been conducted to design the active suspensions system by different approaches (see [7] and its references).…”