AUTOMATIC VERTICAL HEADLIGHT LEVELLING FOR VEHICLES USING RIDE-HEIGHT FEEDBACK AND SERVO ACTUATION

The vertical aim of a vehicle headlamp can change with passenger and cargo loading because changes in suspension deflection alter the vehicle's pitch attitude.If the beam is aimed too high, it may cause glare for oncoming road users; if aimed too low, it can reduce the distance illuminated ahead.Manual levelling requires the driver to recognise the loading condition and select an appropriate setting.This paper presents the design, fabrication and static bench demonstration of an automatic vertical headlamp levelling prototype based on ride-height feedback.A 1 kΩ potentiometer was used to emulate the output of a ride-height sensor and provide a 0-5 V input to an Arduino Uno R3.The input was divided into five discrete bands, each associated with a programmed output command.A transistor stage was characterised at five operating points, with a measured voltage gain ranging from 3.05 to 3.17.The prototype demonstrated stepwise repositioning of the headlamp in response to changes in the simulated ride-height signal.The evaluation was limited to a static bench setup; dynamic road testing and photometric assessment remain necessary to establish the system's performance under vehicle operating conditions.