When it comes to the application of artificial intelligence in cars, everyone’s first reaction is automatic driving and unmanned driving. We always imagine that AI technology enables people to bring a wearable device and operate cars with a single thought. Even one day, without people taking over and losing a destination, the car will drive to the destination by itself. Of course, it would be better to have a time plane like Doraemon. Although it can’t travel through time, it can realize the freedom of space. That’s great.
However, in addition to automatic driving, do you know what AI has been used in intelligent vehicles? Give a small example for your reference.
When it comes to wiper, we all know that this is the basic function of all cars. You may wonder why we mention the high technology of AI and the simple function of wiper? Listen to me~
The traditional car divides the wiper into high speed, low speed, intermittent gear and off. Manually toggle the wiper gear on the combination switch through the driver’s personal feeling of rainfall, so as to ensure the driver’s clear vision and safe driving.
More advanced traditional cars have an automatic wiper function. It detects the rainfall through the rain sensor arranged on the windshield, and then drives the wiper movement.
Optical principle of automatic wiper function:
The infrared light emitting diode emits infrared rays, which are sorted by the optical elements to form a parallel beam with a certain incident angle. The infrared rays will produce total reflection on the inner surface of the windshield, and the reflected infrared rays will focus on the infrared photodiode through the optical elements at the other end.
The reflected light collected on the glass with and without rain is different.
When the glass surface is dry, the light emitted by the transmitting tube is incident on the windshield in parallel, and is reflected back to the greatest extent. After converging through the optical elements, it is received by the photodiode.
When there are raindrops on the outer surface of the glass, the light incident on the windshield is partially scattered, and the light received by the photodiode becomes less after reflection. The greater the rainfall, the less the light reflected back.
By receiving different reflected light, we can judge the current water volume on the windshield, and then judge different rainfall patterns.
According to different rainfall modes, after calibration, the wiper can realize scraping at a certain speed in a certain rainfall range.
Advantages and disadvantages of automatic wiper
advantage:Using optics, it is not easy to produce errors.
The rain sensor has a small contact area and can only be implemented when it falls into its reflection area. If the rainfall is sparse but the raindrops are large, it is likely that the scraping is very slow, affecting the user’s implementation.
Different users have different needs for different rainfall, and the fixed value calibration may not meet the needs of all users.
Of course, more advanced intelligent vehicles have been equipped with intelligent wipers, and AI vision algorithm is used to reduce costs and improve efficiency.
Intelligent wiper principle: AI vision
The intelligent wiper collects the rainfall data on the front windshield through the forward camera installed in the vehicle. The algorithm divides the glass into different areas, and extracts the characteristics of rainfall from the pictures collected by the camera to judge whether there is rain in this area. Then the rainfall is determined by calculating the probability of rain in each area. Finally, the wiping speed and interval of the wiper are adjusted according to the rainfall,
Someone may ask, isn’t the smart wiper just changing from sensor to camera? Is there anything special for users? Of course ~, the rainfall judgment realized by AI algorithm can solve the problem of fixity caused by calibration.
When leaving the factory, the intelligent wiper will have a default state. Users may not like this state during use. For example, when the user thinks the rainfall is heavy, the intelligent wiper moves according to the intermittent gear. At this time, the user will manually adjust the low gear on the combination switch. If the user stays in this gear for a certain time. At this time, the algorithm will think that the user of this vehicle likes faster speed in this rainfall situation, and the algorithm will learn the user’s behavior. When the next cycle or the next power on, it will adjust its own threshold to speed up.
In short, like Taobao shopping, the intelligent wiper can search for things you want to buy many times. Next time, Taobao will push you similar objects to meet your expectations and achieve thousands of people and thousands of faces.
Therefore, if you don’t like the current intelligent wiper speed, you can adjust it manually. He will try to improve it to meet your expectations.
Of course, different smart cars have their own considerations. Some smart wipers only use visual algorithms to detect rainfall, and later use calibration to achieve unity. However, we believe that customization must be the future trend.
The camera has a wide monitoring range, making it easier to detect rainfall.
The interior camera can be used in many aspects, so it can not be equipped with rain sensor alone, which can save cost.
The algorithm relies on camera accuracy.
A large amount of data is needed for algorithm training.
The above is just a simple example to give you an intuitive feeling and experience the difference between intelligent wiper and even intelligent car and traditional car.
In fact, AI has been applied to all aspects of intelligent vehicles, even including some traditional functions. We can expect that the development of AI will promote the continuous development of cars in the future.