The Research Of Vehicle Rear Lamps Control System Based On CAN Bus

Automotive Electronics is a unit of general that automotive electronic controldevices and automotive electronic control devices on body. Automotive bodyelectronic control devices, including the engine control system, chassis controlsystems and body electronic control system (body electronic ECU).A Automotive Electronics growing role in the car, from the beginning of theturn flash, electronic generator regulator to electronic instruments and electronic fuelinjection system ECU everywhere. In security systems and airbags ABS brakes arealso inseparable from the electronic technology, auxiliary driving, reversing radar,elevation measurement, electronic compass, GPS satellite positioning are inseparablefrom the electronic. Now some of the more exclusive automotive electronics occupymore than 20% of the cost ratio.Automotive electronic automotive technology is considered a revolution in thedevelopment process, automotive electronics, this degree is seen as an importantmeasure of the level of the signs are used to develop new models and improve vehicleperformance of the most important technical measures. Manufacturers think that is animportant and effective means increasing the number of automotive electronicequipment, for automotive electronics is the future of the automotive market to seize.With the development of automotive electronics, automotive control systems in alarge number of control signals to exchange real-time processing, which makes thecar the electronic data communication between elements becomes more complex. Asthe car's electronics sharp increase in the number of electrical devices, in order toreduce the number and weight of wire to connect, network, bus technology has greatlyduring this period of development.In recent years, with the rapid development of automotive electronic technology,the world's major car companies, research institutions and various electroniccomponents and automotive applications under the Electronics launched thedevelopment of many new vehicle communication protocol, so far about 40 variety, isnow difficult to agreements based on these new networks to the SAE-defined property of the network in 3 classes to, considering the functions and bit transmission ratefactors, the existing vehicle communication networks can be divided into fivecategories, followed SAE classification and the new division D, E-class network, D,net primarily for multimedia, navigation systems, currently the mainstream of suchnetwork protocols as: DDB (Domestic Digital Bus), MOST (Media Oriented SystemsTransport); E Class Network occupant safety systems-oriented network, mainly usedin the field of passive safety of vehicles, such networks have Byteflight suchagreement.CAN (Controller Area Network) bus is a serial local area network bus, it caneffectively support distributed real-time control, LIN (Local Interconnect Network)bus is mainly used in low speed and complexity of the system to CAN, LIN-basedbus-type vehicle body control will be the inevitable trend of network development.Lamp as a necessary vehicle parts, with the demand to more diverse overalldesign of the lamp and control requirements have become more sophisticated,intelligent control and LED lights which light the concerns the choice of most people.This paper based on CAN bus, car rear lamps designed control system, vehiclerear lights in order to achieve intelligent control. Including the left and right turnsignal lights, left and right position lights, brake lights, high level brake light, rear foglamps, trunk lights and license lights. Brake lights, high brake lights, fog lights andposition lights to LED, the other for the light bulb.Following the specific needs of the project step by step analysis:Power supply module (including the CAN, an external watchdog module): To bothsides of the light load supply; while the number of parts of the controller to provide12V power supply, improve reliability; controller for two-way power supply for ADsampling, respectively, control the power anomaly situation; ignition switch ON forthe off switch and do not work in A / D circuit to provide power.Information collection modules: switch signal through a switching regulator into thecollection filter circuit chip collection, switch acquisition chip microcontrollerthrough the SPI data communication and interaction, to obtain the switch state is inthe on information. Driver output module: open or closed by driving lights;MCU modules: microcontroller selection and distribution of various pin; (includingthe bottom)Low-power design: reducing overall system power consumption;Limp mode design: when the controller (MCU) in case of failures can maintainnormal brake lights work.I believe in the near future, the product through some of the pilot phase and toimprove, can be formally put into use right Automotive Electronic TechnologyResearch and domestic car-bus control system should play a certain positivesignificance.