In terms of the R&D and design of IOV products, human-computer interaction experience and system performance are equally important. Taking Cadillac cue system as an example, this paper analyzes how to achieve the super functional experience of cue system from the perspective of human-computer interaction design based on the product design thought of "driving scenario task -- user needs -- design dimension -- interaction framework".

一、Research on IOV Interactive Experience Design Based on User Scenario Behavior

Drivers usually complete the operation tasks during driving by operating the driving related software (system, entertainment, and third-party applications) and hardware (steering wheel, brake, and gear) with the central control display screen, steering wheel and mobile device as the media. In the whole process, the driver's control of the vehicle driving and the feeling of the cockpit environment are the final criteria for the judgment of user experience.

It is very important to understand the whole process of the driver's control of the car. The human-computer interaction design requires that the IOV product design should be based on the research of user scenarios and tasks, explore the real user needs and meet such needs.

• Driving scenario and task sorting

Based on the real user behavior research, the IOV research team of facecar sorts out the driving operation scenarios, and refines and summarizes the characteristics of tasks in different scenarios to look for similarities and differences. Driving tasks are subdivided as follows: active task, passive task, cross-terminal task, perceptual delay task, immediate task, persistent task, driving task, suspended task, and dormant task.

Different task types will have different user needs, and affect the establishment of interaction specifications, including interaction channels, information types and interactive modes. For example, in "driving task", users usually need to deal with some tasks with very limited attention, which has higher requirements for driving attention and safety. Similarly, there are "passive tasks" (information reminder processing) and "persistent tasks" (persistent navigation in different scenes), etc.

• Frequency and importance of task operation

Although we have divided the user's driving scenarios and tasks in details, it is worth thinking that not all operational tasks are frequent or necessary. According to the operating frequency and importance of user tasks, the latitude division is made as shown in the figure below, which will be more conducive to the operating frequency and convenience of users when sorting out the system related functional framework and interface design in the later stage.

二、User Needs

It is necessary to pay attention to the deeper inner needs of users to create a popular and driver's favorite vehicle system. The experience design and analysis team of Cadillac cue system composed of facecar research experts has conducted a one-to-one in-depth visit to 37 users. Final results show that 35% of users have higher demands for the vehicle system safety; 25% of users pay attention to simplicity of the human-computer interface; 19% of users pay attention to the timely feedback and response of the vehicle system; 15% of users require a stable system; 11% of users expect more intelligent operations. Based on the sorting out and analysis of statistical data, we summarize several key principles of the design of cue system:

Convenient entity keys that can be controlled blindly;

Not let your hands off the steering wheel, eyes off the road;

High reliability, and high safety;

Open system with voice control as the main way and entity key control as the auxiliary way;

三、Design Dimension

Aiming at the emotional elements of cue system design, the research team defines seven design dimensions: confidence, vision, touch, ease of use, safety, comfort and durability based on the research on user usage scenario differentiation, task classification and psychological demand exploitation. The research team also evaluates the value opportunities of the original vehicle system and the existing vehicle system based on this.

Confidence: products enhance user confidence and promote people to use products.

Vision: visual form must combine form, color and texture with the actual situation of product and target market.

Touch: it refers to the actual contact and interaction between people and products, mainly focusing on the hand feeling. These contact and interaction processes must be able to enhance people's experience of using the products.

Ease of use: a product must be easy to use both physically and cognitively. A product should be able to use within the range of natural movement of the human body. For products that have direct contact and interaction with users

the size and shape of its components should be logically organized to facilitate the identification, contact, grasp and control.

Safety: a product must be safe to use.

Comfort: in addition to ease of use and safety, a product should be comfortable to use and should not produce unnatural physical and psychological fatigue.

Durability: automobile performance will change with time, and product appearance must be in good condition within the expected product life.

By sorting out the user needs, the Cadillac cue vehicle system pays more attention to the optimization and improvement for achieving the safe and comfortable operation experience.

Furthermore, a basic requirement for the optimization of the cue system is the improvement in ease of use, vision and feedback to give users confidence in the operation. Certainly, the design measured by multi-dimensions should ensure the durability, and withstand the test of time and the needs of optimization and iterative update.

四、Interpretation of Cadillac cue System Interaction Experience Design

The Cadillac cue system is mainly composed of center console, instrument panel display screen, steering wheel control device and speech recognition system. Its core device is the center console screen and touch panel. The whole system fully considers the perfect cooperation between industrial (hardware) design and software design, forming a unique IOV innovative product.

1. Hardware design analysis: during the steering wheel control and driving, drivers should always observe the road conditions and operate the steering wheel. Any visual displacement and hand release may cause potential safety hazards, so it is necessary to consider the control relationship between the hardware system and the central dashboard during the design of multifunctional central dashboard to ensure that drivers can easily switch the central dashboard without letting their eyes off the road and their hands off the steering wheel;

The cue system fully takes the above considerations into account in the scenarios of "driving task", "passive task" and "continuous task" with higher safety requirements, and is designed in accordance with the accuracy and frequency of thumb operation area and right-hand operation area. For example, the main control buttons of "phone, music, video and settings" (tasks in driving) are set up on the steering wheel to achieve the operation task and avoid the driver's distraction in combination with the "central control screen"; in addition, operation buttons with high frequency and operation buttons of "passive task" (phone) without expected start time and predicted implementation form are set up in the area where the driver's hands can operate accurately.

2、Software design analysis: touch experience of central control screen

Based on the early evaluation of value opportunities of the vehicle system, the Cadillac cue system subverts the traditional vehicle system design, and focuses on the optimization and improvement of product and human interaction process (touch), safety, comfort and other aspects. Above all, the touch feedback function of the screen is added. After the touch operation, the screen will vibrate slightly to feed back to the car owner, greatly improving the convenience of operation and ensuring the safety. Furthermore, the interaction of the central control screen follows the principle of unity (unified system interaction gesture). On the one hand, the interaction gesture is consistent with that of the mainstream intelligent mobile devices such as iphone and ipad, etc., and the user's habit of using software products is respected; on the other hand, the interaction gestures of the whole system are consistent to minimize the driver's operation and learning burdens.

Moreover, the interface of the central control screen is designed according to the principle of flattening. During driving, users are often unable to carefully view the screen and carry out deep-level operation, so the cue system synchronously presents the application of multiple equally important channels in the layout mode (gridview) in the specific design, which increases the click area, improves the user's discrimination, and reduces the click threshold; in addition, the operation page level of users is minimized, and the side-pull expansion, Tab switching, pop-over and other ways are used to enter deep-level pages; even if the user is in the deep-level level, this system can also ensure that the user can switch to other functions flexibly and quickly, reduce the burden of path memory and operation psychology, and improve the operation efficiency.

3、Collaboration of mobile devices

The cue system also supports the association with various Bluetooth devices. Users can read the contact persons and music storage files in their mobile phone or tablet through the cue system host. In addition, cue system is also equipped with the corresponding mobile APP software. With smart phones, car owners can easily start the vehicle remotely, prompt the parking position, lock/unlock the door, and obtain the latest data of fuel allowance, total mileage, oil life and current tire pressure at any time.

五、Summary

the research on user scenarios and behaviors is an important basis for the future design and R&D of IOV products. Different from the previous technology-oriented IOV product design mode, the Cadillac cue system adopts the IOV product design mode based on the user usage scenario and demand research. Through the in-depth exploration of psychological needs and pain points of users, the opportunity and value space of vehicle system are found, thus creating the interior experience including safety, comfort and power control, and achieving the interesting combination of the interior environment modeling and function with household characteristics.