From nighttime lighting to adaptive steering, Suruide decodes BYD Tang headlight upgrade and modification technology solutions
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Car headlights are like human eyes, they are the soul and window of the car. We use technical means to upgrade car headlights to higher brightness and more intelligent, which is to fundamentally solve the problem of driving safety. Driving lights have been developed for decades and are no longer limited to the function of "night lighting". In daily applications, more possibilities can be achieved technically.
From the perspective of daily application, adaptive steering headlights (ASF) are highly practical. For example, when we drive at night, there may be some blind spots for the lighting on the inside of the curve. Then we can control our headlight assembly through the steering wheel angle, tire offset angle and driving speed, drive the two eyes, and project the light beam in the direction that the driver needs to see clearly. The adaptive steering light can follow the overall turn of the car.
To this end, Su Rui De has proposed its own solution. Let's take the BYD Tang headlight upgrade and modification technology solution as an example. In the adaptive steering headlight (ASF) upgrade solution, our front wheel swing direction is about 37°, and Su Rui De can achieve a maximum light angle adjustment of 7.5°, which not only provides better lighting effects on the curve, but also helps the driver identify obstacles on the curve.
BYD Auto is a world-leading new energy vehicle manufacturer, and all of their manufacturing processes are under their control. If you want to obtain the steering angle and speed of the car, you need to obtain authorization through the car manufacturer's CAN matrix protocol. There are several reasons for this: First, there is no BYD diagnostic instrument for sale on the market. BYD has a firm control over this diagnostic chain. If you want to obtain this data through diagnostic requests, you will reach a dead end; second, simply authorizing through the car manufacturer's CAN matrix protocol is almost impossible in many areas, and manufacturers are also worried about safety issues. Basically, this road is blocked.
The CAN drawings of BYD Tang headlight upgrade and modification technology solutions decoded by Su Rui De are as follows:
As early as 2018, Su Rui De obtained the CAN matrix protocol authorization of BYD Auto, especially in the field of new energy vehicles, such as BYD E5\E6\E2, BYD Qin, BYD Han, BYD Song, BYD Yuan, BYD D1, K10, BYD Tang, all of which have the manufacturer's CAN matrix protocol authorization. Although the year has been updated to the present, the model has also been modified a lot, and the car-making process has become more and more mature, but BYD is getting closer and closer to the international standard (for export needs), and the previous CAN pins have also been migrated from 12-13 to the international standard 6-14. This is a great improvement, far exceeding other small car manufacturers in China. For BYD, this is "following the good".
The overall project of BYD Tang headlight upgrade and modification is quite detailed, and the technical implementation is not very complicated, so we will not bother you and can do it ourselves. At present, in terms of BYD models and CAN data in China, the database of Su Rui De is second only to BYD original factory, one is due to the cooperative relationship, and the other is due to 12 years of data (drawings, protocols, structures) accumulation. To ensure accurate testing, we still use a multimeter to test the voltage of CAN first, obtain the different pins of CANH and CANL, lead the interface to the outside through an extension line, connect the CAN analysis test tool, and read his vehicle data.
The data adaptation diagram of the BYD Tang headlight upgrade and modification technical solution decoded by Speed Rede is as follows:
The steering angle data of BYD cars is relatively easy to identify. The CAN ID can be directly identified during the process of turning the steering wheel to the left and right. However, unlike other cars, BYD's algorithm is different from other models. This car is calculated cumulatively from the back. We collect the data when the left steering wheel is at the bottom and the right steering wheel is at the bottom, and obtain 2 sets of data. Repeat the verification once, then return to the positive state to see the difference and compare the data, then we can get 3 CAN data of the steering wheel steering angle. The CAN data of some of the BYD Tang headlight upgrade and modification technical solutions decoded by Speed Rui is as follows:
Do you think it is very simple? Indeed, it is very simple to obtain some basic data, but the algorithm BYD made later requires thinking and brainpower. Otherwise, according to the data logic, there are 4 bytes in it, which makes it complicated. The work after collecting the data has just begun. Applying the collected data to the BYD Tang headlight upgrade and modification technical plan has only completed 1% of the work. There are also control logic, circuit design, firmware compilation, road testing, etc.
Road testing is a tedious task, usually done on a monthly basis, to continuously optimize and adjust the sensitivity and user experience of the adaptive steering headlights (ASF), creating a "user experience" that is continuously optimized at different speeds and on different roads and in different environments. The next stage of development work may be to move towards automatic height adjustment of ALS headlights and LED matrix headlights. The application scenario is that when most of our off-road vehicles have height fluctuations on the road at night, the coverage of the headlight beam will be limited. We want to solve this pain point for users and try to make some intelligent control systems for the height adjustment function of the ALS headlight assembly, which can automatically control the headlights by collecting information such as the vehicle's driving status (posture) and road surface changes (up and down), and adjust the lighting angle up and down in real time to provide the driver with the best lighting height.
I have studied the control scheme of ADB adaptive LED star matrix headlights before, but I didn't do it because it was too expensive. Now the ALS headlight height adjustment is just a transitional product. In the end, all three must be available, which is probably our ideal state in this field. We hope to achieve a "smart headlight control system" with smaller shielding area, more precision, anti-glare and other functions. There is still a long way to go. Let's help car owners resist the unknown, avoid risks, and kill loneliness. Are you willing to be my partner?
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