Development of the Noncontact Steering Angle Sensor using a Giant Magnetoresistive Element

In this study, in order to improve steering stability during turning, we devised an inner and outer wheel driving force control system that is based on the steering angle and steering angular velocity, and verified its effectiveness via running tests. In the driving force control system based on steering angle, the inner wheel driving force is weakened in proportion to the steering angle during a turn, and the difference in driving force is applied to the inner and outer wheels by strengthening the outer wheel driving force. In the driving force control (based on steering angular velocity), the value obtained by multiplying the driving force constant and the steering angular velocity, that differentiates the driver steering input during turning output as the driving force of the inner and outer wheels. By controlling the driving force of the inner and outer wheels, it reduces the maximum steering angle by 40 deg and it became possible to improve the cornering marginal performance and improve the steering stability at the J-turn. In the pylon slalom it reduces the maximum steering angle by 45 deg and it became possible to improve the responsiveness of the vehicle. Control by steering angle is effective during steady turning, while control by steering angular velocity is effective during sharp turning. The inner and outer wheel driving force control are expected to further improve steering stability.

Download Full-text

An Analytical Transient Tire Model

Tire Science and Technology ◽

10.2346/1.2135231 ◽

2001 ◽

Vol 29 (2) ◽

pp. 108-132 ◽

Cited By ~ 1

Author(s):

A. Ghazi Zadeh ◽

A. Fahim

Keyword(s):

Transient Behavior ◽

Stability Control ◽

Vehicle Stability ◽

Tire Model ◽

Steering Angle ◽

First Order ◽

Vehicle Stability Control ◽

Proposed Model ◽

Depth Study ◽

And Performance

Abstract The dynamics of a vehicle's tires is a major contributor to the vehicle stability, control, and performance. A better understanding of the handling performance and lateral stability of the vehicle can be achieved by an in-depth study of the transient behavior of the tire. In this article, the transient response of the tire to a steering angle input is examined and an analytical second order tire model is proposed. This model provides a means for a better understanding of the transient behavior of the tire. The proposed model is also applied to a vehicle model and its performance is compared with a first order tire model.

Download Full-text

Recent Studies of Tire Braking Performance

Tire Science and Technology ◽

10.2346/1.2167159 ◽

1973 ◽

Vol 1 (2) ◽

pp. 121-137 ◽

Cited By ~ 1

Author(s):

J. L. McCarty ◽

T. J. W. Leland

Keyword(s):

Steady State ◽

Rapid Cycling ◽

Single Cycle ◽

Steering Angle ◽

Slip Ratio ◽

Factors Affecting ◽

Braking Performance ◽

Constant Rate

Abstract The results from recent studies of some factors affecting tire braking and cornering performance are presented together with a discussion of the possible application of these results to the design of aircraft braking systems. The first part of the paper is concerned with steady-state braking, that is, results from tests conducted at a constant slip ratio or steering angle or both. The second part deals with cyclic braking tests, both single cycle, where brakes are applied at a constant rate until wheel lockup is achieved, and rapid cycling of the brakes under control of a currently operational antiskid system.

Download Full-text

Steering Angle Prediction Techniques for Autonomous Ground Vehicles: A Review

IEEE Access ◽

10.1109/access.2021.3083890 ◽

2021 ◽

pp. 1-1

Author(s):

Hajira Saleem ◽

Faisal Riaz ◽

Leonardo Mostarda ◽

Muaz A. Niazi ◽

Ammar Rafiq ◽

...

Keyword(s):

Ground Vehicles ◽

Steering Angle ◽

Autonomous Ground Vehicles ◽

Prediction Techniques

Download Full-text

CFD study of aerodynamic performance of non-pneumatic tyre with hexagonal spokes

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/09544070211013124 ◽

2021 ◽

pp. 095440702110131

Author(s):

Daksh Bhatia ◽

Praneeth KR ◽

Babu Rao Ponangi ◽

Meghana Athadkar ◽

Carine V Dsouza

Keyword(s):

Comparative Study ◽

Lift Coefficient ◽

Aerodynamic Performance ◽

Practical Implementation ◽

Air Velocity ◽

Aerodynamic Forces ◽

Steering Angle ◽

Camber Angle ◽

Drag And Lift ◽

Yaw Angle

Non-pneumatic tyres (NPT) provide a greater advantage over the pneumatic type owing to their construct which increases the reliability of the tyre operation and effectively reduces maintenance involved. Analysing the aerodynamic forces acting on a NPT becomes a crucial factor in understanding it’s suitability for practical implementation. In the present work, the aerodynamic performance of a NPT using CFD tool – SimScale® is studied. This work includes a comparative study of a pneumatic tyre, a NPT with wedge spokes and a NPT with hexagonal spokes (NPT-HS). The effect of air velocity, steering (yaw) angle and camber angle on the aerodynamic performance of the NPT-HS is evaluated using CFD. By increasing the steering angle from 0° to 15°, the lift coefficient decreases by 37% approximately at all velocities. Whereas drag coefficient initially decreases by 21% till 7.5° steering angle and then starts increasing. Increasing camber angle from 0° to 1.5°, both drag and lift coefficients goes on decreasing by approximately 7% and 27% respectively.

Download Full-text