In order to realize an automatic driving system that operates safely under all conditions, excellent vehicle position specific accuracy is required. Inertial sensors can provide reliable vehicle position data, even in severe cases of misdetection by other sensors.
There are many names for autonomous vehicles, unmanned vehicles, robotic vehicles, etc., but cars with autonomous driving capabilities are getting closer and closer to the day when they become part of our lives. The establishment of safety is a prerequisite for achieving this goal.
Tommi Vilenius, senior manager of business development at Murata Electronics, said: "The priority of the development of autonomous vehicles is to ensure that passengers and other road users are protected from danger and can drive the vehicle safely. For autonomous driving to be able to drive safely on the road And to park safely, the in-vehicle system accurately grasps the location of the vehicle is essential."
Compared with ordinary vehicles, the positioning accuracy of autonomous vehicles is extremely important and needs to be able to recognize "which lane is driving on" instead of "which road is driving on." Usually the width of a lane is only 2.7 meters to 4.6 meters, and it can be said that the allowable error is extremely small.
"In order to develop a truly safe self-driving vehicle, we need to use a combination of camera, driver and inertial sensors. By combining these sensors, sufficient vehicle position accuracy can be achieved. And this is now possible immediately. "
The camera is at risk of false detection
In the case of the camera and the driver, the situation around the vehicle is grasped through software analysis and processing, but sometimes the system may not be able to correctly grasp the situation.
Vilenius pointed out: “For example, the animation of the advertising display screen may be mistakenly recognized as a vehicle or a pedestrian, or the position or direction of the vehicle may be lost at an intersection with heavy traffic.â€
"The camera and the driver rely heavily on software, but it is impossible to make software code errors completely zero. Moreover, complex software requires a lot of computing power is also a problem."
If it is a camera and a driver, we must first explain the situation around the vehicle, but if it is an inertial sensor, you can directly obtain information about the current location of the vehicle and which direction it is facing. Even when the camera and the driver cannot correctly identify the direction of travel, the inertial sensor always provides correct orientation data.
Although satellite positioning systems such as GPS, Beidou, and Glonass can be used to supplement visual sensors and inertial sensors, the accuracy of the satellite positioning system is only a few meters, and at low speeds, the quality of the azimuth data showing the forward direction is reduced.
Through the high-precision azimuth data provided by the inertial sensor, the correct driving direction is always maintained.
What can be done now to achieve autonomous driving
The self-driving car market is rapidly expanding, but no one can accurately predict what the next generation system will look like.
Vilenius pointed out: "Unfortunately, before the popularity of self-driving cars reaches a certain level, we cannot correctly judge what should be improved to achieve smooth and safe transportation? Or which new systems are needed. The same is true for vehicle positioning sensor technology."
But on the other hand, there are also things that we can implement now. Many of Murata's existing sensor products can be immediately applied to the development and production of autonomous vehicles. Murata Manufacturing Co., Ltd. has been engaged in the research and development of in-vehicle products for many years, and our inertial sensors can exert reliable safety performance even in autonomous vehicles. Among them, the gyroscope integrated acceleration sensor has provided 50 million units of products for the automotive industry.
Reasons for choosing inertial sensors:
Since the inertial sensor can work without being affected by environmental conditions, even if the camera and the driver cannot correctly identify the surrounding situation, it can also provide accurate data on the condition of the vehicle.
The most important thing about inertial sensors in autonomous vehicles is superior vibration resistance and stability against temperature changes and vibration.
According to Vilenius, “Even in the harshest road conditions, sensors with superior stability can provide reliable data and perform stable performance under various temperature conditions (severe cold and heat).â€
In the past two generations, Murata Manufacturing Co., Ltd. has achieved "failure prevention of sensors", that is, a system that does not damage the operation of the vehicle even if the sensor fails. Although this is a very important requirement in modern vehicle systems, it is an essential absolute condition for autonomous vehicles.
Murata's sensor products are cost-effective and compact.
"In the current market, Murata's sensor products are highly praised by customers for their superior quality. Murata has developed in-vehicle safety such as anti-skid devices (ESC) that are essential for safety in response to strict performance requirements. For system sensors, we fully understand the use environment of sensors and the needs of the automotive industry."
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