Most of today's lights use a fixed design, which cannot meet the safety vision lighting needs of car drivers at different speeds and road conditions. Therefore, the research unit has developed sensors that combine brightness, speed and distance, as well as motor control and LED light source models The adjustable light control system created by the group will further improve driving safety.

At present, most of the car lights commonly used by the public do not have automatic brightness adjustment and switching functions, so this paper proposes a car light source system that combines a light source adjustment mechanism and an automatic control concept.

This system is composed of several single chips to form a distributed control system. The control chip separately detects the driving safety distance and automatically adjusts the driving light source projection, and detects the brightness value of the ambient light source by the brightness sensor. When the surrounding brightness is sufficient, the control system will adjust the motor to make the LED light source to the lens focus to form a high-brightness projection; when the surrounding brightness is insufficient, the motor reverse adjustment makes the distance between the LED light source and the lens narrow and project The LED beam angle has a wide projection area, which effectively allows drivers using traffic vehicles at night to quickly master the road conditions. In addition, there is a distance detector behind the system, which can remind the driver of the distance behind the car to improve driving safety at night.

LED will become the main road lighting equipment in the future

Steam locomotives, electric vehicles or bicycles are now vehicles with high mobility in life. Such tools are prone to traffic accidents due to bad warnings. In some advanced countries, it is advocated that the lights must be turned on day and night. Its purpose is to remind other passers-by to pay attention to ensure safe driving on the road. At present, academia has proposed a lot of vehicle lighting systems that can improve driving safety. The following points are described one by one.

. Car headlight automatic induction lighting system

The system uses light sensors and temperature and humidity sensors to determine day and night, rain or fog, and automatically turns on the headlight function. Most of the headlights used in general road vehicles use relays to control the reflector to adjust the distance of the light source of the car. This fixing method is easy to irradiate the road surface because of the improper lamp holder device. Affect traffic safety.

. Active headlight control system

The system includes automatic steering and level adjustment. The lamp holder is designed by the encoder to detect the steering wheel angle, micro switch and stepper motor to achieve automatic headlight steering control. The research is driven by sensor equipment and motor. To establish an active headlight control system.

. Roadworthiness car headlight steering system

In order to allow drivers to see the road ahead ahead, the study designed to use the head rotation to calculate the angle that the headlight should project, and the horizontal adjustment used an Ultrasonic Sensor to detect the front and rear road heights to achieve the automatic headlight level Adjustment function.

In recent years, in addition to functionality and practicability, the appearance and shape of automobile lamps have also become demands for product design. The automobile lamp industry has also shown this phenomenon. As the production technology of power-type light-emitting diodes advances, the luminous intensity is improved, and because of its advantages of small size, light weight, power saving, long life, low fever, fast response speed and good seismic performance, the momentum is bullish.

LED lighting will be the main lighting equipment for road traffic in the future. Most of the common lighting methods are locked and fixed to the front or frame, and do not have the function of automatically adjusting the brightness of the light source and the switching of the near and far lights. This fixed method is easy to cause. Improper user equipment affects other road users, and when illuminated under a bright street light, the light source projected by the LED cannot automatically adjust the brightness and the switching of the light distance, resulting in the LED light source being easily covered by the brightness of the street light, allowing driving The vehicle in cannot clearly grasp the driving direction of the bicycle. If the vehicle running at high speed does not have the function of switching between near and far lights, the driver can not clearly understand the road conditions in the distance. From this, it can be confirmed that switching lighting devices is one of the indispensable devices for night vehicle driving.

Brief introduction of car light source system

Due to the different driving speeds of vehicles driving on traffic roads, the required safety vision will also change, in order to improve the driving safety. This paper proposes a decentralized control system, each chip only produces the corresponding result of the input signal (Figure 1), in order to reduce the calculation time. This system uses a brightness sensor, speed sensor, and distance sensor, respectively. This system can follow the movement of the vehicle and the change of the ambient light brightness. The angle of the near and far lights can be accurately changed by the servo motor to achieve automatic multi-segment angle adjustment of the tilt angle of the light source of the car and the motor to drive the screw to adjust the distance between the lens and the LED , Change the angle of the light beam projected by the LED to achieve the brightness adjustment of automatically switching the near and far lights and illumination.

Figure 1 Decentralized control system design architecture diagram

The control system is composed of multiple modules, including a chip control module, an ambient brightness light source sensing module, a motor control circuit module, and a vehicle speed sensor module, and the system is compiled with a C language program.

Main control system design

This system uses several Holtek HT66F50 control chips (Figure 2) with self-designed hardware circuits. Each group of hardware circuits has its own functions to reduce the system's distributed computing time. The control chip will be connected to the output status of each sensing module, converted into a digital signal, and then compared, timed, counted and other functions to calculate the changes in vehicle travel and make the corresponding safety warning function.

Figure 2 Control chip hardware circuit

Lead Free Piezoelectric Elements

The Co-Al Co-doped Barium Titanate Lead-free Piezoelectric Ceramics was successfully developed by Yuhai company through repeated experiments. By Researching the influence of Co-Al Co-doping on the structure and properties of Barium Titanate-based piezoelectric ceramics, the formulation and preparation technology of Barium Titanate-based piezoelectric ceramics were optimized. Yuhai`s BaTiO3 was prepared by conventional solid-phase sintering method, with the piezoelectric constant d33 (>170pC/N), dielectric loss tgδ≤0.5% and mechanical coupling coefficient Kp≥0.34.

Barium titanate lead-free piezoelectric ceramics are important basic materials for the development of modern science and technology, which was widely used in the manufacture of ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers, ceramic frequency discriminators, high voltage generators, infrared detectors, surface acoustic wave devices, electro-optic devices, ignition and detonation devices, and piezoelectric gyroscope and so on.

Application: military, ocean, fishery, scientific research, mine detection, daily life and other fields.

China Patent of Yuhai company`s BaTiO3

Chinese Patent No.: ZL 2011 1 0126758.6

Name: Lead-free Barium Titanate Piezoelectric Material with Addition of Cobalt and Aluminum

Piezo Element,Piezo Ceramic Elements,Piezoelectric Ceramic,Pzt Tubes

Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com