The Study Of A Tunnel Lighting System Based On CAN Bus

Tunnel lighting whose cost accounts for a large proportion in the whole tunneloperation is essential to ensure the safety operation in the tunnel. With the development oftransport infrastructure construction in the Midwest, the tunnel number is rapidly increasingand unscientific tunnel lighting has become the cause of low economic benefit in theoperation department.The light source and lighting control methods used in the tunnel sofar can not meet the need of saving energy and reducing consumption and also can’trespond to the changes in tunnel under complicated environment.Through the comparison on the performances of several kinds of field bus, CAN bushas great advantages especially in its simple structure, high stability, strong anti-jammingcapability, good extensibility,openness, and low cost. This topic has developed a tunnellighting system based on CAN bus,including CAN bus repeater, gateway, and the constantcurrent power supply of automatic adjustable light LED flat light. It realized manyfunctions,such as tree network of more than A CAN bus, multi-node control, multi-channel12bit A/D conversion circuit, PWM variable constant-voltage source, emergency powersupply, lightning protection electricity, high transmission rate, etcThis paper introduces at length the tunnel tube position setting, C0851F040chip withCAN bus, the repeater based on MCP2510which is the so called stand-alone CANController with SPI and their software communication protocol, the lamp power supplycircuit with adjustable output voltage based on Cuk circuit.There are also many relatedexperimental data and analysis in it.Through a lot of experiments, the tunnel lighting system can realize the unification ofthe various intelligent node control, fault self-diagnosis in emergency, emergency treatmentand so on.It not only meet the requirements of the tunnel lighting but also effectively savethe energy...