Influence of deteriorated suspension components on ABS braking (original) (raw)
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Influence of Suspension Component Deterioration on Vehicle Handling
2006
This paper presents a simulation study of the in∞uence of deterioration of suspension components on vehicle handling and safety. The emphasis is placed on the deterioration of the shock absorbers and rubber bushings and their efiects on vehicle ride control. The study is based on a 3D multibody model of a passenger car. The models of deteriorated components are varied on the reference vehicle model and a safety benchmark, an emergency braking with anti-lock brakes is evaluated in order to indicate the in∞uence. Good handling and ride control of vehicles depends not only on their design, but particularly on the condition of the vehicle components and suspension components in particular. Moreover the current vehicles are equipped with many kinds of electronic devices assisting drivers in their daily as well as emergency situations. The devices focused on the active safety such as ABS, ASR of ESP, etc. should increase the handling of the vehicles by a targeted intervention to the brake...
Diagnostic tests of vehicle suspension during braking
2016
This paper describes the influence of shock absorbers' technical condition on the vehicle braking process on two types of surface with the Anti-Lock Braking System activated and deactivated. During each of the road tests the vehicle stopping distance, the braking deceleration, and the force applied on the brake pedal were determined. The test plan includes various road surfaces and technical conditions of shock absorbers. The established characteristics of the stopping distance and the deceleration allow the determination of the relations between the technical condition of the shock absorbers, the road surface, and the efficiency of the braking system. In addition, this paper presents the principle of operation of the Anti-Lock Braking System, which is one of the basic active safety systems.
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2005
This paper presents a simulation study into the characteristics of a vehicle experiencing steering drift under straight line braking. Simulation modelling has been performed using a multi-body dynamics analysis based on a model of an actual vehicle. Front and rear suspension parameters have been modelled as rigid links joined with flexible bushes so as to assess their effect on a vehicle while braking. Suspension geometry and alignment settings, which define characteristic responses such as lateral acceleration, yaw velocity, toe, and caster angles of a vehicle in a transient manoeuvre, are primary to a vehicle's directional stability. Any symmetric inconsistencies in these settings will potentially affect a vehicle's performance. The findings from this research have increased the understanding of the causes of steering drift during braking conditions.
The Effect of Road Quality on Integrated Control of Active Suspension and Anti-lock Braking Systems
2019
This paper investigates the effect of road quality on the control strategies of active suspension system integrated with anti-lock braking system in a quarter-car vehicle model. To this aim, two optimal control laws for active suspension system and anti-lock braking system are analytically designed using the responses prediction of a continuous 4 degree of freedom non-linear vehicle model including longitudinal and vertical dynamics. The optimal feature of the suspension controller provides the possibility of adjusting the weighting factors to meet the ride comfort and road holding criteria on roads with various qualities. It is shown that, regulating the tire deflection in a constant value to increase the tire normal load leads to instability of suspension system. Therefore, the active suspension system cannot influence on the anti-lock braking system performance on flat roads in a quarter car model. The same effect is observed for hard braking on irregular roads with good quality. In this condition, the active suspension system should be focused on the ride comfort as its first aim. However, for braking on irregular roads with poor quality, decreasing the variation of tire deflection to avoid the tire from jumping is effective in reducing the stopping distance.
Effect of shock absorber and ABS on the vehicle emergency stopping distance
In recent years, the number of car accidents in Saudi Arabia increased significantly. Mechanical failures are about 5% of the total causes of accidents. The shock absorber of the most important mechanical parts, which affect the performance of the car on the road especially on ride comfort and braking distance. This paper is concerned with the theoretical and experimental study of the performance of the vehicle emergency stopping distance with and without shock absorber and ABS system, the theoretical study was done by using Matlab program , quarter car model and the experimental study was done by using real car and real road conditions. The experimental tests are done inside Buraydah Collage of Technology on straight line asphalt rough road using two different speeds (50 & 80 km/hr) and different weights (Laden & Unladen). The results showed that, defects in the suspension system (mainly caused by worn shock absorbers) do increasing in the stopping distance by about 40 % even if ABS is working and small effect for ABS on emergency stopping distance especially on rough road
DAAAM International Scientific Book, 2016
This paper presents the validation for a simplified mathematical model of a passenger-car's ABS (Anti-Lock Braking System) for a "quarter-car" planar model was considered: a wheel in rotation movement and a mass in translational movement (the vehicle mass supported by that wheel), in accordance with the continuous improvement of the ABS (anti-lock braking system) operation for the passenger cars. The mathematical model consists in the motion equations of the wheel and "quarter-car" mass and in the equations describing the behaviour of the driver, controller, hydraulic module and brake. The model was transposed in a Matlab-Simulink model, offering the possibility to simulate many times how the ABS works if the constructive parameters, road conditions or driver inputs are changed. To validate a simplified model of a passenger car ABS (Anti-Lock Braking System) for a "quarter-car" planar model were conducted experimental researches in order to determine the braking performance of a vehicle on roads / runways with different adhesion coefficients.
The influence of the vehicle’s suspension malfunction on its operational efficiency
Ukrainian Journal of Mechanical Engineering and Materials Science, 2018
The main malfunctions that arise when operating a vehicle in Ukraine are the failure of the suspension elements and vehicle tires due to the poor condition of the most roads [11]. The car suspension elements soften the dynamic loads and smooth out the oscillations from the unevenness on the road while riding and provide a good stability and smoothness of the car ride. The car suspension affects not only the handling, stability, stability of the car motion, but also provides comfort and safety of the car, especially, when car is driven on uneven surface of the road and in sharp manoeuvres of the movement. The suspension of the car is a connecting linkage between the wheels and the body of the vehicle through which the forces of the shocks from wheel act on the vehicle body while riding over bumps on the road. Also, especially the front suspension of the car smooths the oscillations from the uneven road and provides the smooth ride. The smoothness of the ride depends on the elasticity of the suspension and car tires, work of shock absorbers and distribution of the vehicle mass. Besides, the smoothness of the ride on the uneven road has the influence on the comfort of the driver and passengers, the average speed of movement (as a consequence it causes the changes in fuel consumption, productivity and cost of transportation), the cargos safety, the reliability of the car. The car suspension is one of the least reliable and durable elements of the car. The work of the faulty suspension reduces the durability of the car in 1.5 times and worsens its steering, thereby reducing its safety [11]. Ultimately, the motion of a car with a faulty suspension can cause an emergency on the road due to possible unpredictable suspension behavior. The analyzing of the typical malfunctions of the car suspension components and its influence on smoothness and safety of motion is provided in the article. The methods of experimental research of the influence of the typical suspension malfunctions on the parameters of the car motion have been developed. The choice of research tools and the mounting place of the sensors on a car suspension is substantiated. On the basis of the experimental research results, the analysis of the influence of the suspension malfunction on the car's condition was performed according to the voltage changing of the sensor-analyzer, and the voltage change was transformed into the linear displacement of the suspension elements. With the use of the MATLAB program in Simulink mode the simulation of the car ride over the typical obstacles with the use of a two-mass structure for sprung and unsprung masses was carried out, the oscillations of the unsprung and sprung masses were obtained in relation to the road with given pressure in the tire and given speed when riding over various types of obstacles with the normal and faulty shock absorbers.
Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2019
The article presents the analysis of the impact of reduced damping in the suspension on the change of selected characteristics of vehicle steering. The most important factors influencing the dynamic characteristics of the vehicle steered are described. To this purpose, experimental tests were carried out on a B-class passenger vehicle for selected road tests. These tests were carried out on a vehicle with nominal and reduced damping in the right front wheel suspension. The effect of changing the position of the centre of mass on the behaviour of the vehicle was also taken into account. Comparisons of vehicle test results with standard suspension and with modifications have been carried out. The influence of reduced damping in the suspension on the change of the vehicle steering characteristics in steady and dynamically changing conditions was analysed. In the conducted considerations, the indicators defining the properties of vehicle steerability and stability were used. The determi...
Modelling and simulation of motor vehicle suspension system
IOP Conference Series: Materials Science and Engineering, 2021
In this work, using a quarter-car model was adopted, the equations of motion were derived for a passive and then the sky-hook semi-active suspension systems. The derived differential equations, solved using the Dormand-Prince pair numerical formula, was then used to simulate values of displacements as affected by damping coefficients and the sky-hook constant. The simulated results showed that the maximum amplitude of the sprung mass, which is linked to ride discomfort, increases while those of unsprung masses, which affects the road holding ability, decreases with increasing depth of pothole. Furthermore, displacements for both sprung and unsprung masses varied directly with damping coefficient. Finally, as the sky-hook constant of the semi active system model increases, values of amplitudes of unsprung masses decreases while those of sprung masses increases. It was, thus, shown that the vertical displacements of vehicle bodies and wheels are dependent on the depth of potholes, dam...
The behaviour of a vehicle’s suspension system on dynamic testing conditions
IOP Conference Series: Materials Science and Engineering, 2018
The paper presents a car suspension's behaviour on dynamic testing conditions through theoretical and mathematical simulation on specific model, on the single traction wheel, according to the real vehicle and by experiment on the test bench by reproducing the road's geometry and vehicle's speed and measuring the acceleration and damping response of the suspension system on that wheel. There are taking in consideration also the geometry and properties of the tyre-wheel model and physical wheel's properties. The results are important due to the suspension's model properties which allows to extend the theory and applications to the whole vehicle for improving the vehicle's dynamics.