1.HMI determines the difference between ADAS and Autonomous Driving
ADAS is a support system for human beings driving a car, and Autonomous Driving is a concept that automobiles run autonomously. It is in the point that whether the subject of driving is a human or a system determines the difference between Autonomous Driving classified into ADAS which is Autonomous Driving level 2 and level 3 or higher. Because the subject of driving is human, ADAS must accurately inform the driver of the state of the car and the necessary operation. On the other hand, in Autonomous Driving above level 3, the subject of the operation becomes the system, and as the level goes up, the number of elements that the car conveys complicated information on driving operation to the driver decreases. HMI design is exactly an important concept unique to ADAS.
2. Human-to-car information transmission in ADAS is based on the definition of Human Factors
In order to study HMI elements in ADAS it is important to define Human factors which are synonymous with ergonomics in a broad sense. For example, it is necessary to define the operation such as steering wheel and brake pedal so that the operation of a car when driving a car can be safely and economically operated. When the machine (car) detects the defined human (driver) 's behavior, the command transmission from human to machine is done.
3. Cars to human communication in HMI
Conversely, when communicating from machine to human, it transmits through visual, auditory, tactile and so on.
In order to make the information transmitted from the in-vehicle system misunderstand or confuse human driving behavior, accurately recognize it without giving a negative influence and make effective use of ADAS function, it is necessary to use an interface such as audiovisual information. Attention and ingenuity are necessary for its design.
4. Interface design of HMI
When communicating information from the ADAS system to the driver, it is vital to design the most reasonable and easy-to-understand visual and audible indication that attention is paid to sensory modalities such as visual, auditory, etc., according to its contents and characteristics. A clear message is indicated by the physical characteristics such as the size and color of the visual indication, sound pressure and frequency of the auditory indication.
HMI exchanges information between people and machines via equipment and software. In the case of a car, it corresponds to steering, accelerator, brake, various instruments indicating the state of a car, etc. which the driver operates when driving.
Originally automobile instruments were mostly simple mechanical type such as speedometer, tachometer, direction indicator, various warning lights. However, as automotive electronics have progressed, it became necessary to tell drivers more information, such as displaying surrounding conditions on a car navigation monitor.
Especially in the HMI design of ADAS, the driver must understand the information transmitted from the automobile system correctly so as not to negatively affect the driving operation. It is important to consider the characteristics of information and to adopt visual and auditory senses suitable for it.