sensorPopular words in the semiconductor field.Driven by the new energy vehicle market, the vehicle sensor is released with huge market potential.On September 5th, the Ministry of Industry and Information Technology's industrial stability growth series theme press conference pointed out that it is necessary to support technical research such as high -precision sensors to achieve the development goals of about 9 million new energy vehicles in 2023.High precision becomes a keyword for the car sensor, providing a development direction for practitioners who bloom to bloom.
   
    High -precision sensors have not appeared in the planning of the Ministry of Industry and Information Technology for the development of the automotive industry.In June this year, at the routine briefing of the policy held by the Journalism Office of the State Council, Xin Guobin, deputy minister of the Ministry of Industry and Information Technology, said that in the next step, members of the new energy vehicle industry development department will focus on several aspects of work.It is mentioned that innovation is productivity. It is necessary to accelerate the development and promotion of new technologies and new products such as key chips, high -precision sensors, and operating systems to further enhance the vitality of the industry's development.
    Earlier this month, the "Stable Growth Work Plan (2023-2024)" jointly released by the Ministry of Industry and Information Technology, including the Ministry of Industry and Information Technology, once again proposed: Support the development of car chips, solid state, solid state, solid stateBattery, Operating system, high -precision sensor and other technical research and application, further improve product performance.
    When the sensor enters the new energy vehicle field, high precision is the primary requirement.
    Why is a high -precision sensor placed in such an important position?
    at the end, this is related to the trend of electrification, intelligence, and networking of new energy vehicles.The autonomous driving system requires the vehicle to accurately and keenly capture the location of the vehicle and the distance from the surrounding things. Therefore, it is determined whether the vehicle needs to make a reaction of steering and braking. This requires the car to have more accurate radar and camera sensors.
    For the power management system, new energy vehicles also put forward higher requirements for sensor accuracy.
    Honeywell's technical support engineer Wang Haijun is accepting "ChinaelectronicThe reporter said in an interview that only taking current sensors as an example, new energy vehicles are different from the power sensor used by traditional industries.Many current sensors, including industry and other purposes, measure the accuracy based on the full range.For example, the full range of a battery is 1000 amp, then if the agreed accuracy is 1%, the error is only no more than 10 ampel -this is the so -called accuracy of the so -called full range.However, this measurement accuracy is too extensive for application scenarios that are very sensitive to new energy vehicles.The battery power of new energy vehicles changes. In this way, in the case of low automotive power, if the accuracy of the current sensor is still calculated at a full range, the real power consumption cannot be accurately measured.Taking a battery with a full amount of 1000 amp as an example, when only 10%left, that is, 100 amp electricity, the original error 10 ampel is equivalent to 10%of the current total power.Energy vehicle power is accurate and controlled, which is not conducive to improving the energy utilization efficiency of the vehicle.
    therefore, Wang Haijun proposed that if the power of new energy vehicles is to be scientifically measured, a subrills are required.In other words, different accuracy current measurement is performed for different battery power status of the vehicle.In this way, the current sensor requires high accuracy when a small range.
    Not only that, because the car needs to adapt to different temperature environments, it is also necessary to ensure that the car sensor can achieve the accuracy of the full temperature area.In other words, the same high -precision measurement can be achieved in different temperature environments.Because some materials and devices will deform and elastic changes under high temperature or low temperature, the design accuracy of the sensor needs to meet higher standards.
    How to achieve high accuracy?
    As for how to improve the accuracy of the sensor, Guo Yuansheng, executive vice chairman of the China Sensor and the Internet of Things Industry Alliance, gave such a few directions in an interview with the China Electronics News reporter:The second is to have process equipment and detection methods that can support high -precision sensors; the third is to formulate sensor standards for different application scenarios.
    In terms of the common basic process of sensors, optimization materials are the primary work.
    in the method of materials, Guangdong Audi Senior Sensing Technology Co., Ltd. (hereinafter referred to as the Audiwei) market and product management department Shi PengPiezoelectric CeramicsThe product was explained as an example.Current, piezoelectric ceramicsUltrasonic sensorIt is the main type of automotive ultrasonic sensor, which is very popular due to its low cost.Shi Peng said that in order to improve the accuracy of the ultrasonic sensor, the measurement is further measured. It is not to be implemented by software and algorithms, but it is necessary to start formulating and development from raw materials. It is important to improve the material formula of piezoelectric ceramics.To this end, Shi Peng said that in order to better improve the accuracy of the voltage -electrical ceramic ultrasonic ultrasonic sensor, Audiwite established the Materials Research Institute to continuously formulate formula for piezoelectric ceramic materials.
    calibration is the key link of sensor accuracy control. Whether the accuracy of the sensor meets the standards needs to be controlled by the calibration link.The production process of sensors includes many processes. Each craft node needs to correct the product to determine whether the product is qualified.In an interview with the General Manager of Sales Manager of Weica International Trade (Shanghai) Co., Ltd. (hereinafter referred to as Weica), the general manager of Sales Manager said that 0, 25%, 50%, 75%, and 100%of the product of the product saidA total of five pressure points are suppressed to see if the test results are in line with the design indicators.Sugarin said that in general, the calibration accuracy must reach at least 3 times the product design accuracy.
    Sugarin told the China Electronics Daily that there are three parts of the accuracy of the accuracy of the car sensor that are commonly speaking: it is non -linear, that is, the gap between the design error of the sensor and the finished product error;That is, the consistency of the data is obtained when repeatedly measured the same sensor and the same indicator; the third is the creep, that is, the measurement accuracy after changes such as the transformation of sensors such as the sensor in high temperature and pressure.
    For cars, the repetitive accuracy index of cars is very important, that is, after the car is used for one, two years, five years, or more, the repetitive accuracy of the car will decrease.Sensor accuracy needs to be guaranteed that after 15 years of use, even if the material fatigue, deformation, and accuracy have occurred, the accuracy remains within the design range.Sugarin said that in order to achieve this standard, the calibration standards can basically meet the requirements as long as the standards are set to require the standard.