Browse Publications Technical Papers 2009-28-0022

Differential Speed Based Bend Lighting in Adaptive Front lighting system 2009-28-0022

Bend lighting is achieved in two ways: static bend lighting and dynamic bend lighting. In both these cases the turning angle of the vehicle is required. Mostly this angle is calculated from the steering angle or in some systems through GPS. The first method has many drawbacks like it is dependent on the type of steering (mechanical, hydraulic or electrical) so it can not be a universal system. In the other method GPS based bend lighting is a very expensive solution and also GPS cannot be accessed from everywhere at all instances.
In this publication the difference in speed of front wheels of a vehicle while turning is used. By using the speed of the front two wheels the actual turning angle of the vehicle can be calculated.
This method is better suitable as it is not dependent on the type of steering: mechanical, electrical, hydraulic or even a joystick. It also is independent of the ratios between the steering wheel, steering shaft and the attached gear.
This system can also be clubbed with the speed based beam adaptation for AFS and ABS (Automatic Braking System) hence increasing the efficiency and decreasing the overall cost of the vehicle.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.