Car suspension system in automotive engineering

Automotive engineering has brought forth the ability in today’s cars to reach a balance between the riding comfort and its road handling capability. This has been achieved through an active suspension control installed in the car, through a typical distributed control system. We discuss here a brief account of the mechanism of an active suspension system in a vehicle, where the distributed structure of the mechanism has been taken into account.

Automotive engineering has helped to conceive the theory of embedded distributed control architectures that have come to be the first and foremost innovation in modern cars, which have been applied to achieve improvements in performance in the vehicles. The system costs more than a quarter of the cost that is required to manufacture a car, which has made the car manufacturers to have a re-look at the costing and make improvement of the effective cost of the vehicle.
Introduction of such technologies have brought disadvantages. With computers deployed in the architectural design of the system in controlling the suspensions of a car, it has given rise to delays and jitters in the vehicles, giving rise to degraded performance.

Deployment of larger computer systems in the architecture has been found to solve the problem, but it has become a hard challenge for the car manufacturers to reduce prices and meet the competition.

With the advent of modern automotive engineering, the architectural concepts of distributed control have been applied in active suspension control systems in vehicles in order to provide a smoother ride.
This suspension control system comprises of a set of mechanisms at the four corners of a vehicle. These are springs, shock absorbers, and a hydraulic actuator. These four sets of mechanisms provide the car with a better road holding and improved comfort, with the suspension buffering all the forces between the vehicle and the road.

Presently, the active suspension provides a much better comfort and road holding, where sensors are used to transmit information to the different points in the vehicle, which is processed by one or more controlling systems.
The processors calculate the amount of controlling forces that should be activated by the four hydraulic actuators situated at the four corners of the vehicle. The information between the sensors, controllers, and actuators is usually communicated through a Bus system.

There are two methods by which the driving comfort and safety of a vehicle are measured. These are the “sprung mass accelerations” and “tire load variations“. The vehicles fitted with active suspensions have been measured by these two methods, and it has been found that the systems provide an improved driving comfort.
But there remain the issues in the design of the systems for active suspension in vehicles, and these issues are divided into two sub-problems.

There are design issues of the ride controller, which is responsible for improving the ride control of the vehicle, and isolates the vibrations reaching the vehicle due to road conditions.
The roll and pitch of the vehicle is controlled by the attitude controller, and there are issues in the design of this mechanism.

This sub-system specifically provides the control of load levelling, with proper load distribution through-out the nodal points in the vehicle.

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