CONTENT INTRODUCTION OPTICAL SENSOR PARAMETERS MEASUREMENT PLOTS OF LED MOUNTING OF SENSOR TILT ANGLE HOW TO MEASURE TILT ANGLE? SIGNAL PROCESSING RESULTS ON RACETRACKS ADVANTAGES DRAWBACKS APPLICATION CONCLUSION REFERENCE
INTRODUCTION New technology in Modern vehicles to enhance safety Anti Lock Braking System (ABS) Tilt angle (Roll angle) – crucial variable to determine motorcycle behavior Represents the amount of inclination to ensure the force balance
The technology uses a sensor to measure tilt angle at real-time Tilt angle is a by product of GPS but does not provide at real-time Optical sensors are suitable as technologically as well as economically for racing applications
PARAMETERS Measurement range : 15-100cms Output voltage : 0.5-2.5 volts Emitters : LED, LASER Average output power : 0.1mW
MEASUREMENT PLOTS OF LED
MOUNTING OF SENSORS
TILT ANGLEDefinition : Angle represents the amount of inclination that the bike needs in order to ensure the force balance during the curved trajectory and hence to reach a steady state cornering condition .
HOW TO MEASURE TILT ANGLE?
Tilt angle ( ϕ )= arctan((d1 − d2)/L) d1 = Ho + L/2 tan (ϕ) d2 = Ho - L/2 tan (ϕ) Where, L :- Lateral displacement b/w the 2 distance sensors Ho :- Distance b/w each sensor and the ground when the bike axis is vertical d1&d2 :- Distance b/w the marked points and the ground
RESULTS ON RACETRACK
ADVANTAGES Small size Low cost Low weight <10 gm Variable range depending on mounting condition Accurate measurement
DRAWBACKS LED emitter suffers too much from solar interference LED not adequate for real-time measurements at high motorbike speeds Roughness of roads make noise interference
APPLICATION Tilt angle measurement in sports bikes
CONCLUSION Optical sensors are used to measure tilt angle LED and LASER emitters are used LASER is used more than LED Sensors must be mounted at a reliable distance from the ground