LED light source is considered as one of the important way for power saving and environmental protection. In this paper,
a heat dissipation method for integrated high power LED lamp was investigated to solve its heat dissipation problem in
engineering application. Firstly, the heat generation characteristics of integrated high power LED light source and the
demand of heat dissipation of LED lamp were analyzed, and a heat dissipation analytic model was set up. Secondly,
optimization of fins of radiator was carried out and optimal result was obtained. Thirdly, the result was applied to guide
the radiator design of integrated high power LED street lamp. Lastly, the numerical simulation and temperature
experiment of radiator were performed. Experiments shown that the radiator design satisfies the demand. It is of
importance to guide the radiator design for LED Lamp.
The paper studies the photometric patch design way of aspherical lens to solve the difficulty of photometric design for
integrated high power LED street lamp, which has the demand of prescribed rectangular illumination. It divides lens
surface into several corresponding patches according to the subarea of road surface, and controls luminous beam to
appointed area in order to adjusting radiation shape through controlling parameters of lens surface. Based on the optics
simulation software LightTools the paper takes maximum luminance, average luminance and length of rectangular
illumination as optimal objects, and optimizes the parameters of photometric patch design optimal model for aspherical
lens of integrated high power LED street lamp using orthogonal experimental method. And the optimal result is good
and satisfies the relational national standards about street and road luminance. The paper validates rationality of
photometric patch design method and validity of the lens through experiment. The study puts forward an effective design
way for strict photometric demand about LED street lamp.
A swerving mathematical model was established after stating the shortage of the present AFS swerving algorithm. The
conception of 'expected lighting distance' was extended to 'expected lighting bound' and approximate treatment of
geometry of light beam falling to ground of headlamp was processed. The expected lighting bound was ascertained and
the lighting range of turning angle of headlamp was calculated. The calculation formula of turning angle of headlamp
was worked out. It was indicated that the turning angle of inside and outside of headlamp calculated by revised algorithm
was reasonable by comparing calculation. Finally the control strategy about the turning angle of inside and outside
headlamp when turning was worked out. It is of practical significance in promoting the active safety, reducing the traffic
accidents caused by insufficient angle and range of irradiation of headlamp.
Adaptive front lighting system (i.e., AFS) is the development trend of lighting system of motor vehicles. AFS means that
headlamp can adjust beam direction to get best illumination according to road condition and its bodywork. The paper
discusses the AFS key techniques: establishing calculation formulae of vehicle body state concerned road condition and
steering state. Because of sensor technology limitations, it only can deal with inclination and turn of vehicle body state
by means of sensor's signals. This paper studies the relationship between inclination and turn of the body and lamp
lighting on the base of relative standards, and gives out the calculation formulae for the body and lamp lighting
adjustment, also discusses its dynamical properties. The study is basic work for lighting adjustment automatically.
Vehicle navigation is the corn element of Intelligent Transport System. The integrated system of "Beidou" Double-star/DR is studied in this paper according to the present state of vehicle navigation in our country. "Beidou" Double-star navigation position system is one regional satellite position system built up by our country, which can provide rapidly not only highly precision position and brevity telegram service. However, when the vehicles go around the tall buildings, high mountain area, wayside trees and in the tunnels, all signal may not be received. If the satellite navigation position system is used only, the precision will be reduced. Therefore, this paper proposes a nonlinear self-adaptive Kalman filter model and its algorithm for a Double-star/DR integrated navigation system in land vehicles, and verifies effectively the algorithm and scheme through the means of simulation. Next, this paper introduces map match approach. The roads are segmented and character information is brought out. Then, proper search rules and map match algorithm are adopted. According to the current vehicle position information that Double-Star/DR system provides, the nearest road can be found in the map database. The vehicle position will be matched and displayed on the road. The result of the experiment shows that the Double-Star/DR integrated algorithm and map match can improve reliability and the precision of vehicle navigation system efficiently.
This paper analyzes the error types for segmented reflector lamp, and puts out an optimal design method for segmented reflector based on error analysis. The paper establishes optimization model for segmented reflector considering the error analysis in manufacturing process of segmented reflector. Based on this optimization model it could give out shapes of reflector patches for segmented reflector which is low sensitive to the errors, and direct the plan process efficiently and get out the final reflector consistent with the designed one, which is important for auto lamp design.