Self Tuning PID Control Of Antilock Braking System Using Electronic Wedge Brake

This paper describes the design of an antilock braking system (ABS) control for a passenger vehicle that employs an electronic wedge brake (EWB). The system is based on a two-degree-of-freedom (2-DOF) vehicle dynamic traction model, with the EWB acting as the brake actuator. The developed control structure, known as the Self-Tuning PID controller, is made up of a proportional-integral-derivative (PID) controller that serves as the main feedback loop control and a fuzzy supervisory system that serves as a tuner for the PID controller gains. This control structure is generated through two structures, namely FPID and SFPID, where the difference between these two structures is based on the fuzzy input used. An ABS-based PI D controller and a fuzzy fractional PID controller developed in previous works were used as the benchmark, as well as the testing method, to evaluate the effectiveness of the controller structure. According to the results of the tests, the performance of the SFPID controller is better than that of other PID and FPID controllers, being 10% and 1% faster in terms of stopping time, 8% and 1% shorter in terms of stopping distance, 9% and 1% faster in terms of settling time, and 40% and 5% more efficient in reaching the target slip, respectively

Electric Car Chassis Design and Analysis by Using CATIA V5 R19

The evolution of computer aided design (CAD) systems and related technologies has promoted the development of software for the east of chassis modeling. It visualizes the main outputs of the model, which consist in numeric data and graphic elements. This reduces the simulation time dramatically and enables the optimization process to come to successful results. This paper presents an electric car chassis design by using the commercial design software package, CATIA V5 R19. The design of the chassis with adequate stiffness and strength is the aim of this project. The material used is mild steel AISI 1018 with 386 MPa of yield strength and 634 MPa of ultimate strength. The result shows that the critical point of stress and displacement occurred in the middle of the side members in all loading conditions, maximum stresses are below the yield stress. The final products for the design have been fabricated successfully

Numerical simulation of aerodynamics effect on an automotive side mirror

Computational Fluid Dynamics (CFD) is applied to estimate the pressure distribution and velocity flow pattern on side mirror surface and side window using Fluent 6.3 software. Due to the complexity of an actual side mirror shape, simple side mirror geometry (generic side mirror) has been proposed and being used by other researchers for simulation or experimental works. In this project, generic side mirror has been modified (modified generic side mirror) which studied important parameters such as foot height, foot width, upper and lower lips length using two different solvers which are k-epsilon standard and realizable turbulence models. The results obtained are discussed in term of pressure coefficient, Cp and velocity distribution at side mirror surface and side window. Because of air flow near side mirror involved wake and turbulent, turbulent intensity trend from centre of side mirror surface along horizontal axis has been studied. For this case, the turbulent intensity shows rapidly increased from side mirror surface and reach maximum approximately 0.1 m from side mirror surface, then gradually decrease. Also, upper and lower lips length from side mirror surface plays an important role on determine the pressure coefficient, Cp and velocity contour at side mirror surface. Results obtained had been compared with other researchers work and show similar pattern when determine the pressure coefficient, Cp. With all these results, suitable design guideline can be made from the modified generic side mirror geometry which has foot height = 15mm, foot width = 45 mm and upper / lower lip ratio = 2

Simulation of Air Flow on Modified Generic Shape of an Automotive Side View Mirror

In this paper, an aerodynamics effect of modified generic side view mirror geometry which has different upper lip and lower lip length is discussed. The numerical simulation is done by using Computational Fluid Dynamics (CFD) software which is FLUENT using k-epsilon standard turbulence model. The results obtained are discussed in term of pressure coefficient, Cp and velocity distribution at side mirror surface. Results obtained had been compared with other researchers work. With all these results, the effect of upper and lower lips length on air flow characteristic have been determined and optimization of side view mirror shape has been proposed

The Effect of Flow Characteristic on Generic Shape of an Automotive Side Mirror

In this paper, an aerodynamics effect of a simple side mirror geometry with different foot height and foot width is discussed. The numerical simulation is done by using Fluent software with two solvers which are k-epsilon standard and realizable turbulence models. The results obtained are discussed in term of velocity magnitude and pressure coefficient at side mirror surface and side window. Turbulent intensity along the horizontal air flow direction from the center of side mirror surface also has been discussed. With all these results, the best design of simple side mirror geometry has been proposed

SIMULATION OF AN ACTIVE FRONT BUMPER SYSTEM FOR FRONTAL IMPACT PROTECTION

In this paper, an active front bumper system is discussed on the effectiveness to reduce the jerk of a vehicle during collision. The mathematical model is done by using MATLAB 7.0 to simulate a collision between a pendulum and a vehicle installed with an active front bumper system. This study also presents the performance characteristics of a magnetorheological (MR) damper for controllable bumper in the vehicle system. One of promising candidate is the MR fluid undergoes significant instantaneous reversible changes in material characteristics when subjected to a magnetic field. The proposed damper is integrated with bellows to induce the flow motion and the motion is operated under flow mode. The parameter is change follow the situation or the behaviors of collision between pendulum and vehicle. If the situations are light and medium collision, the mass of pendulum will be change into 1/5 mass of vehicle and 3/5 mass of vehicle respectively. For heavy collision, the mass of pendulum is set same as mass of vehicle. In the simulation, the comparison of jerk and acceleration of the vehicle are done between an active front bumper system which use passive dampers and skyhook controller as its mechanism. Both mechanisms will test in modeling simulation for all type of collision

The effect of contact angle on triangular shape interrupted microchannel heat sinks performance

The effect of different contact angle on triangular shaped interrupted microchannel performance was studied by simulation using FLUENT software. The investigated effects were pressure drop and platinum film temperature. The flow in microchannel is laminar and single phase. Water was used as the working fluid and the interrupted microchannel is made of silicon. A thin platinum film plate was deposited to provide uniform heat flux. The geometry dimension of the heat sink is 30 mm in length, width of 7 mm and the thickness of 0.525 mm. The chosen contact angles that were investigated are 48.13º , 51.27 º and 58.48 º . From the simulation result, pressure drop and thermal dissipation is the highest for contact angle 58.48 º and 48.13 º respectively. Reducing the contact angle reduces the pressure drop and increases the thermal dissipation

The Effect of Contact Angle on Triangular Shape Interrupted Microchannel Heat Sinks Performance

The effect of different contact angle on triangular shaped interrupted microchannel performance was studied by simulation using FLUENT software. The investigated effects were pressure drop and platinum film temperature. The flow in microchannel is laminar and single phase. Water was used as the working fluid and the interrupted microchannel is made of silicon. A thin platinum film plate was deposited to provide uniform heat flux. The geometry dimension of the heat sink is 30 mm in length, width of 7 mm and the thickness of 0.525 mm. The chosen contact angles that were investigated are 48.13º , 51.27 º and 58.48 º . From the simulation result, pressure drop and thermal dissipation is the highest for contact angle 58.48 º and 48.13 º respectively. Reducing the contact angle reduces the pressure drop and increases the thermal dissipation