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Emam, M. A. A.
- A Computerized Tyre Pressure Control System for Off-Road Vehicles
Abstract Views :289 |
PDF Views:2
Authors
Affiliations
1 Automotive and Tractor Engineering Dept., Helwan University, EG
2 Higher Technological Institute, 10th of Ramadan City, 6th of October Branch, EG
1 Automotive and Tractor Engineering Dept., Helwan University, EG
2 Higher Technological Institute, 10th of Ramadan City, 6th of October Branch, EG
Source
International Journal of Vehicle Structures and Systems, Vol 3, No 4 (2011), Pagination: 210-218Abstract
This paper presents a computerized tyre pressure control system for off-road vehicles to achieve the required tyre flotation pressure during their mobility. This method accounts for soil deformation and tyre deflection in the vehicle tyre-terrain interaction. A test rig has been designed to apply vertical load to the tyre at the tyre to terrain surface. The deflection and inflation pressure of the tyre were recorded by a data acquisition system. The test rig is integrated with a pressure system for tyre inflation and deflation. The proposed control system ensures that the soil deformation is higher than the tyre deflection. Experimental results showed that the proposed control system adjusted the tyre pressure to the flotation pressure for a given load and soil conditions within a reasonably shorter elapsed time.Keywords
Off-Road Mobility, Tyre Pressure Control, Tyre Flotation, Tyre Sinkage.
- Automatic Adaptation of Tire Pressure According to Operating Conditions
Abstract Views :258 |
PDF Views:122
Authors
Affiliations
1 Military Technical College, EG
2 Dept. of Automotive and Tractors Engg., Helwan University, EG
3 Future University in Egypt (FUE), EG
1 Military Technical College, EG
2 Dept. of Automotive and Tractors Engg., Helwan University, EG
3 Future University in Egypt (FUE), EG
Source
International Journal of Vehicle Structures and Systems, Vol 8, No 2 (2016), Pagination: 112-117Abstract
The off-road vehicles have much higher rolling resistance due to tire sinkage. This paper presents a proposed system for automatic adaptation for tire inflation/deflation, according to operating conditions. The tire inflation pressure is manually changed by the driver to some prefixed pressure values. The proposed control system is based on calculating the instantaneous wheel slip ratio. As the slip ratio increases, the tire pressure decreases automatically to increase the contact area and to decrease the dynamic sinkage and vice versa. An algorithm for the control strategy is developed. The proposed system provides a continuous monitoring of tire pressures inside the tire and then to inflate/deflate according to terrain types. The results show that a low inflation pressure has a considerable effect on the net traction ratio where it improves the performance by 20% and the buffed tire has a better traction than lugged tire on sand.Keywords
Terramechanics, Soil Bin, Tire Pressure, Inflation, Deflation, Slip Ratio, Dynamic Sinkage, Net Traction Ratio.Full Text
References
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- H.P. Schlechter. 1994. Design and performance of central tire inflation systems, Proc. 6th European ISTVS Conf., Austria.
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- P.J. Forrest, I.F. Reed and G.V. Constantakis. 1962. Tractive characteristics of radial-ply tires, Trans. ASAE, 43(11), 108-115. http://dx.doi.org/10.13031/2013.40948.
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- A. Hendy, S. Hegazy, M.A. Emam and Y. Hendawy. 2013. Development of an in-door soil bin testing facility experimental setup, Proc. 15th Int. Conf. Aerospace Sciences & Aviation Tech., Cairo, Egypt.
- Modeling and Simulation of Off-Road Vehicle Mobility with Driving Torque Distribution Control on Split Adhesion Conditions
Abstract Views :239 |
PDF Views:134
Authors
Affiliations
1 Dept. of Automotive and Tractors Engg., Helwan University, Cairo, EG
1 Dept. of Automotive and Tractors Engg., Helwan University, Cairo, EG
Source
International Journal of Vehicle Structures and Systems, Vol 9, No 2 (2017), Pagination: 95-102Abstract
This paper presents a theoretical model for simulation of driving torque distribution control to improve off-road vehicle mobility on split adhesion conditions. The model is constructed and then validated with experimental test rig results. A MATLAB simulink modeling of an electronically controlled device is used to modulate the applied force over multi-plate clutches located between the automotive driven axle shafts and the stationary hub. On driving over split adhesion roads, the control device brakes the spinning axle wheel running over ground low adhesion side and accordingly biases more torque to the other wheel with good adhesion side. This would improve the vehicle off-road mobility and save the power losses on low adhesion wheels. The proposed control model had been validated with experimental results obtained from an experimental tests conducted on a specially designed and built test rig. Consequently, the proposed control system has been embedded within a full car theoretical model to predict the vehicle performance on split adhesion drive conditions. The results showed that the constructed simulink model is suitable for simulating the proposed controlled device for torque distribution after matching the simulation results with experimental test rig results. Moreover, the proposed control model could be implemented to improve the transmitted traction power to the road from a conventional deferential.Keywords
Off-Road Vehicle, Automotive Torque Distribution, Driving Torque Distribution Control, Matlab Simulink.Full Text
References
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- L. Lifu and W. Zhan. 2011. Study on torque vectoring differential for vehicle stability control via hardware in-loop simulation, IEEE Paper, 978-1-61284-486.
- M.A. El-Hafiz. 2012. Axle Torque Distribution Control for Enhancing Off-road Vehicle Performance, PhD. Thesis, Faculty of Engg., Helwan University, Mattaria.
- M.A. El-Hafiz, M. Emam, W. Oraby and S. Shaaban. 2014. Axle torque distribution control for enhancing mobility of off-road vehicles, Int. J. Heavy Vehicle Systems, 21(3).
- Effect of Active Roll Stabilizer System Performance on Vehicle Stability
Abstract Views :233 |
PDF Views:139
Authors
Affiliations
1 Dept. of Automotive and Tractors Engg., Helwan University, Cairo, EG
1 Dept. of Automotive and Tractors Engg., Helwan University, Cairo, EG
Source
International Journal of Vehicle Structures and Systems, Vol 9, No 2 (2017), Pagination: 117-123Abstract
To investigate the effect of active roll stabilizer system performance on vehicle stability, it is needed to study the effects of varying speeds of the on-road vehicles under different wheel steer angle on the roll angle, side slip angle and yaw rate on the vehicle stability. For a safe drive, when a vehicle is cornering it should not lose its stability on road. In this paper the response of passive and active roll stabilizer vehicle systems are simulated and compared against each other. The results of the simulation model showed a significant influence of the vehicle speed on the vehicle stability under different wheel steer angles.Keywords
Active Anti-Roll Bar, Vehicle Stability, Passive and Active Roll Stabilizer, Matlab Simulink, Steer Angles.Full Text
References
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