Avdc (Adaptive Vehicle Dynamic Control) is called GAC Adaptive Vehicle Dynamic Control System. This system integrates EMS, TCU, ESP, four-wheel drive and other systems through "domain control", and then intelligently adapts to the current state.
Adaptive vehicle dynamic stability system can be regarded as intelligent dynamic stability system, which has two main functions. One is to make the driving conditions and vehicle dynamic response more in line with the driver's intention, improve driving confidence, and thus increase the driving pleasure. The other is to suppress the shaking of the car body when cornering as much as possible, improve the riding stability and increase the passengers' peace of mind.
Compared with the previous body stability system, the adaptive vehicle dynamic control system is different in "dynamics". When the traditional body stabilization system is triggered, the vehicle has slipped or lost control. The adaptive vehicle dynamic control system can change the dynamic performance of the vehicle at any time according to the driver's operation and the current state of the vehicle, and realize the integration of the dynamic response of the vehicle and the driver's intention during driving.
Guangzhou Automobile Research Institute began to study related technologies on 20 17. The second generation GS8 is the first vehicle equipped with AVDC adaptive dynamic stability system and the first vehicle equipped with adaptive dynamic control system in its own brand.
The original intention of AVDC research and development is to realize adaptive vehicle dynamic control based on existing hardware conditions without increasing user cost, so if you insist on what it is, it is just an algorithm.
Without the vehicle equipped with AVDC, all parts of the vehicle only perform their duties and only control the steering, while ESP is only triggered when the vehicle slides abnormally, lacking the ability to work together.
On the other hand, vehicles equipped with AVDC integrate the functions of various components, which can work together through algorithms. For example, when a vehicle enters a corner, it is found that the body is shaking greatly, which will reduce the engine torque and exert a certain braking force on the wheels, so that the dynamic center of gravity of the vehicle will shift to the front position, and finally the driver can turn smoothly.
Having said that, some friends may be curious, how does it realize dynamic monitoring?
When the vehicle is running, all parts of the vehicle will have various signals, such as wheel speed, wheel angle and so on. , the vehicle will generate acceleration in all directions. AVDC collects these real-time signals and accelerations, combined with the driver's input, and makes an optimal scheme after calculation, and finally makes appropriate fine adjustments to the engine output torque, steering system, braking system and transmission system.
At this time, curious friends will ask, what is the optimal solution?
When people drive a vehicle, when they feel scared, the acceleration of the vehicle will suddenly change. This sudden change in acceleration has a threshold. As long as it does not exceed this value, people will not be afraid.
The optimal solution of AVDC calculation is to minimize the adjustment range of the vehicle and make the instantaneous acceleration change of the vehicle not exceed the threshold.
In order to find this threshold, Guangzhou Automobile Research Institute published 19 papers and applied for 3 1 invention patents, which were internationally recognized. Based on the whole set of AVDC theory, it can play a role in all road conditions.
The AVDC vehicle dynamic control system of Guangzhou Automobile Research Institute can be adjusted according to different models. If it is a sports car, it can give full play to the tracking ability of the vehicle and enhance the fun of control. For the second-generation GS8, which pursues comfort and luxury, it has another important task.
The second-generation GS8 is nearly 5 meters long and has a wheelbase of 2920mm, so it is a big car properly, so the task of AVDC is to make the vehicle run more smoothly and easily and ride more comfortably.
How to make driving smoother? The AVDC function of the second generation GS8 is designed with throttle sensitivity adjustment function.
As the name implies, the throttle sensitivity can be adjusted, that is, the acceleration attribute of the vehicle can be changed without changing the driver's pedal stroke, which can be divided into five gears or adjusted to an adaptive mode.
In this way, no matter what driving mode, the driver can get a smooth driving feeling. For a simple example, if you usually like sports mode, but encounter traffic jams, you certainly don't want the vehicles to rush out at once, and AVDC will judge that the current road condition is traffic jams, which will reduce the throttle sensitivity, so that you can use sports mode to successfully pass the traffic jams.
How to make the second generation GS8 easier to drive?
The second-generation GS8, like many models, has designed three kinds of steering wheel handfeel, namely lightness, comfort and movement, which changed the strength of playing the square board.
The function of AVDC is to reduce the angle of the steering wheel without changing the steering ratio. No matter what feel is used, just turn on AVDC.
As for how to do this, the simple description is to realize the shift of the center of gravity of the whole vehicle by fine-tuning the longitudinal acceleration and deceleration of the vehicle, thus changing the transient steering characteristics of the vehicle. Finally, in the same corner, the vehicle with AVDC turned on can roll through the corner with smaller steering angle, so that the amplitude of the steering wheel is naturally reduced and driving will become easier.
According to the test data, after AVDC is started, the yaw and lateral acceleration of the vehicle in continuous parallel lines are obviously reduced.
Then, for passengers, the car does not suddenly accelerate when sitting up, and there is no obvious left-right swing when cornering, so the comfort is naturally improved.
What needs to be mentioned here is that the four-wheel drive model has complete AVDC functions, while the predecessor model can achieve 90% functions, so if you want to experience the benefits of AVDC, you don't have to worry about whether you are a predecessor or a four-wheel drive model.
The control panel of AVDC is in function setting, and the default mode is ON. There are four modes: stable, radical, snowy and adaptive. Here I recommend using the adaptive mode directly.
The difference between robust control and radical control lies in the difference of G value allowed by the vehicle, that is, when cornering, the robust control will control the roll of the vehicle smaller and the vehicle will be more conservative, while the radical control will allow the vehicle to move bigger and travel faster.
The adaptive mode can be judged according to the driver's driving behavior under the current working condition. If the driver operates relatively, it will automatically make the vehicle yaw bigger and throttle harder.
Write it at the end
It is the first time that an independent brand is equipped with a vehicle dynamic control system, and its appearance has solved the feeling that most users will panic when driving a big car. Besides, I think the metaphor of shadow driver is very appropriate. It can really help you make driving easier and smoother like a driver.
For such an easy-to-use system, I also hope that GAC Chuanqi will carry more AVDC functions in future cars.