What is the car control system VDC (automobile dynamic control system), it is estimated that many people will be a bit confused about the car control system, small series of information on the car control system VDC and other car control systems, the full text is as follows:
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What is the car control system VDC?
The ABS/ASR system successfully solves the problem of directional stability of the car during braking and driving, but it cannot solve the problem of directional stability when the car is turning. Recently, the developed countries of the automobile industry have developed into a vehicle dynamic control system based on the ABS/ASR system (English name is Vehicle Dynamics Control, VDC for short).
Automobile control system VDC: The control system of the main assembly of the car's brake, drive, suspension, steering, engine, etc. is integrated in function and structure, which can make the car under various severe working conditions. For example, on ice and snow roads, on the off-road surface, on curved road surfaces, and when moving under the conditions of shifting, braking, accelerating and downhill, it is good for different load, different tire pressure and different degrees of tire wear. The directional stability shows the best driving performance.
The application of VDC completely relieves the driver's high requirements in terms of braking, acceleration and steering, and sets a new milestone in the active and safe driving of the car. The control of steering travel by the VDC system is mainly achieved by means of brake control and engine power output control for each wheel.
For example, when the car turns left, if the front wheel tends to slide out of the curve due to insufficient steering ability, the VDC system can detect that the side slip is about to occur, and adopt the method of properly braking the left rear wheel. The braking force generated by the left rear wheel helps the car to turn, allowing the car to continue to follow the ideal route, as shown in Figure 1.
Figure 1 Brake front and rear wheels help the car turn
If on the same curve, the rear wheel tends to slide sideways and turn too much, the VDC system adopts the method of properly braking the right front wheel to maintain stable driving of the vehicle. In extreme cases, the VDC system can also reduce the speed of the vehicle by reducing the power output of the engine and reduce the need for lateral adhesion to the ground to maintain stable driving of the vehicle. With the VDC system, the braking distance of the car on the off-road or curved road surface can be further shortened.
VDC car control system built-in sensor
Wheel speed sensor for tracking the movement state of each wheel;
a steering wheel angle sensor for sensing the corner of the steering wheel;
A yaw rate sensor for recording all movement of the car about a vertical axis;
a lateral acceleration sensor for detecting the magnitude of centrifugal force during steering travel;
Wheel displacement sensor for measuring changes in the relative position of the wheel and body.
The heart of these sensors is the yaw rate sensor because the ratio of the yaw rate of the car to the steering wheel angle is an important parameter in response to the steering quality of the car. The signal from the displacement sensor is transmitted to an electronic control unit for controlling the semi-active suspension to improve the grounding performance of the vehicle.
Other sensors transmit information about the instantaneous state of motion of the car to the electronic control unit to compare it to the ideal state of motion. Once the car deviates from the ideal route, it takes corrective action in a very short period of time. The corresponding command is issued to the brake control system or the engine control system to maintain the car on the ideal route. Figure 2 is a schematic diagram of the arrangement of the night car of the VIDC system of the Delphi company in the United States.
VDC car control system sensor distribution
Other car control system terms
â– What is the ABC?-ABC body active control system.
The ABC system makes the car's control of roll, pitch, yaw, jump and body height faster and more precise. The roll of the vehicle body is small, and the change of the camber angle of the wheel is also small, and the tire can maintain the vertical contact with the ground well, so that the adhesion of the tire to the ground is improved, so as to fully exert the driving and braking effect of the tire. The emergence of ABC overcomes the contradiction between suspension setting comfort and handling, and maximizes the consumer's requirements for the vehicle in these two aspects.
â– What is the ABD?-ABD automatic brake differential.
It is a new product of the braking force system. Its main function is to shorten the braking distance and cooperate with ABS and EBD. When the brake is emergency, the car will nod and the weight of the car will move forward, and the weight of the rear wheel of the corresponding car will be reduced. In severe cases, the rear wheel will lose the grip, which is equivalent to only the front wheel. Braking will cause the braking distance to be too long. The ABD can effectively prevent this situation. It can detect this by detecting the rotation speed of all the wheels, correspondingly reduce the braking force of the rear wheel to maintain effective friction with the ground, and increase the braking force of the front wheel to the maximum. In order to achieve the purpose of shortening the braking distance.
The difference between ABD and ABS is that ABS is to ensure that the wheels are not locked during emergency braking, so as to achieve safe control, and the braking distance cannot be effectively shortened. The ABD allows the braking force to be maximized by the EBD to ensure that the vehicle does not slip, so as to effectively shorten the braking distance.
â– What is the ABS?-ABS Anti-Lock Brake System.
In the absence of ABS, if the emergency brakes generally cause the tires to lock, the brakes will become longer due to the sliding friction between the tires and the ground after the lock. If the front wheel is locked, the car loses the lateral steering force and is easy to run off; if the rear wheel is locked, the rear wheel will lose the lateral grip and the tail is prone to occur. Especially on snowy roads, the above situation is more likely to occur when emergency braking occurs.
ABS controls the wheel lock by controlling the brake oil pressure. The working process is actually a cycle of locking-relaxing-locking-relaxing, so that the vehicle is always in a critically-locked gap rolling state.
However, in some movie stunt scenes, some cars do not have ABS, so we can see a variety of difficult and exciting scenes such as skid and tail. For some senior racers who want to pursue driving stimuli, they also don't like to put ABS on their cars. After all, ABS is not designed for special actors and senior racers, but for general drivers to ensure their safety. In the 1990s, the most concerned about the car configuration was ABS. At that time, Jetta and Santana did not dare to say that it was necessary for every car. Now, ABS is the standard equipment for new cars.
â– What is the DSC?-DSC body dynamics control system.
The ASC automatic stability control system and the traction control system are integrated in the self-developed DSC control system of BMW, which can control the slipping state of the driving wheel by selectively braking the driving wheel that has a tendency to slip, thereby correspondingly driving the vehicle. Stabilization. On snowy, desert or gravel roads, the driver can push the vehicle into DTC mode with the push of a button, thereby enhancing the traction of the vehicle on the road.
At the same time, due to the slightly extended intervention response limit of the DSC dynamic stability control system, the traction and driving force of the vehicle also increase, and the driver can enjoy an extraordinary sports driving experience. Another function of the DSC Dynamic Stability Control System is the CBC Curved Brake Control System, which eliminates oversteer tendency by asymmetric braking force control during a slight braking of the turn.
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