In fact, the English electronic differential lock is called ElectronicDifferentialSystem. It is an extension function of ABS. It is used to identify whether the wheel of the car loses the ground friction and controls the car's skid wheel. This article refers to the address: http:// working principle The working principle of EDS is relatively easy to understand. Because the differential allows the wheels on both sides of the drive shaft to rotate at different speeds, if the wheel on one side of the drive shaft slips or hangs, the other side of the wheel will be completely devoid of power when the EDS electronic differential lock passes through the ABS system. The sensor automatically detects the difference in the rotational speed of the wheels on both sides due to the slipping or floating of the wheel, and brakes the wheel on the slip side through the ABS system, so that the driving force effectively acts on the non-slip side. The wheels ensure that the car starts smoothly. When the driving condition of the vehicle returns to normal, the electronic differential lock stops. When the two wheels of the automobile drive shaft start on the road with different adhesion coefficients, for example, one drive wheel is on the dry asphalt road, the other drive wheel is on the ice surface, and the EDS electronic differential lock passes the sensor of the ABS system. The rotation speed of the left and right wheels is automatically detected. When the rotation speed of the wheels on both sides is different due to the wheel slip, the EDS system brakes the wheel on the slip side through the ABS system, so that the driving force effectively acts on the non-slip The wheels on the side ensure that the car starts smoothly. XDS On the domestic golf GTI we heard a new term: XDS electronic differential lock. On the official website, manufacturers advertise their products like this: "GTI's excellent dynamic balance on the curve also benefits from another magic weapon - XDS vehicle dynamic electronic differential lock, XDS built into the ESP system can avoid the inside drive The slipping of the wheel effectively improves the understeer of the front-wheel drive; while the large-sized brake disc provides excellent braking performance, which provides a safer guarantee for the driver's ultimate speed." The XDS system seems to be very powerful. Of course, the propaganda of the manufacturer needs to be dialectically treated. Moreover, there may be many people who do not understand: Why avoid avoiding understeer by avoiding the inner driving wheel slip? To measure the performance of a car, in addition to the linear acceleration capability, the key is the performance in the corner. If the high-performance model is equipped with a common differential, it will cause many problems when cornering at high speed. In daily driving, we believe that the four wheels are always close to the ground, and the difference in grip between the left and right wheels is basically negligible, and the differential distributes the power evenly to the left and right wheels. But the situation becomes complicated when driving intensely. Note: The “inside wheel†and “outer wheel†as used below refer to the drive wheels on both sides, excluding the driven wheels. ◠Problem 1: Loss of power A careful driver will have the feeling that an important factor affecting the dynamic performance of the vehicle is the so-called weight transfer. For example, why is the front brake disc of the car larger than the rear brake disc? Because the vehicle leans forward due to inertia when the vehicle is in strong braking, most of the weight of the vehicle is moved to the front axle, so the braking force of the front wheel must be large. The rear axle actually only shares a small portion of the brake work. By the same token, the vehicle will generate a large centrifugal force when turning at a high speed, and the faster the turning speed, the greater the centrifugal force. The centrifugal force will transfer the weight of the vehicle to the side outside the bend, and the members of the vehicle can clearly understand the outward direction. The strength of the squat, and the body performance we see from the outside is that the suspension on the outside of the bend is compressed, and the wheel on the inside of the bend is almost off the ground, and the grip is also drastically reduced. At this time, the shortcomings of the ordinary open differential began to be exposed, that is, the torque was equally distributed to the left and right halves and tend to be less resistant. Specifically, the vehicle in the high-speed cornering, because the resistance of the inner driving wheel is so small that it is almost suspended, the torque acting on the side axle is greatly reduced compared with the straight running, and the insufficient grip may even cause the wheel to start to slip. The torque on the other side of the wheel with the large grip is also small, which is equal to the loss of power for the driver. This is similar to the state in which we let a wheel leave the ground when we do a four-wheel drive system test: the suspended wheel is mad and the vehicle just stops there and barely creeps twice. The difference is that the drive wheel is not necessarily completely separated in the high-speed cornering. The ground and duration is very short. Some people may think that this phenomenon will only last for a few seconds, and it will not affect the manipulation. However, in a race against time, every corner difference of 0.1 seconds may determine victory or defeat. ◠Problem 2: The front car is understeering Now let's talk about oversteer and understeer. The current prevailing view is that the front-wheel drive tends to understeer and the rear-drive tends to over-steer, which is mainly related to the weight distribution of the front and rear axles. Most of the front-drive vehicles are placed in front of the front axle due to the engine and transmission mechanism. The distribution is already "top-heavy", and the weight in the curve moves forward so that the front axle load is further increased, which is likely to cause the front wheel to break through the grip limit, lose the steering effect, and the body no longer turns in the predetermined direction but along The tangential direction of the turning arc is pushed out, which is what we usually call "pushing head". The pusher is obviously unfavorable for raising the cornering speed. Can you minimize the impact of understeer? For the former driver, it is more difficult to change the weight distribution. It can be started from another angle, that is Create a yaw moment. What is the yaw moment? For a simple example, everyone has a boat with a double paddle. What do we do when we turn? If it is to turn left, we must force the right pulp, which will produce A leftward yaw moment, the ship turned to the left. The same principle can be applied to vehicle turning. Have you ever observed how the tank turned? The tank can even be turned in place by the difference of the tracks on both sides. Back in the car, there is now a system that enhances maneuverability by applying yaw moments. The most typical SH-AWD system with Acura, the fourth-generation four-wheel drive system from Jude, and some four-wheel drive models from Audi and BMW. The shaft is equipped with an active torque distribution device and the like. They all use the same principle, that is, actively distribute the torque to the outer wheel when the vehicle is turning to generate a yaw moment into the bend to help the vehicle to bend. ◠The role of the XDS electronic differential lock: The XDS electronic differential lock was created to solve the above two problems. To put it bluntly, it is a limited slip differential that is simulated by an electronic system through a brake. It works by applying a brake to the inner drive wheel with low grip when the vehicle is in the extreme state. According to the manufacturer, the XDS applies a braking force of 5-15 bar to the brake disc. 1 bar is 0.1 N per square millimeter, and the square centimeter is 10 N, which is 1 kg per square centimeter. Its principle is similar to that of some off-road vehicles. Braking the wheel will have two effects: First, the increase of the resistance of the inner sliding wheel makes the engine transmit more torque, which is equivalent to the wheel with good outer grip gain more torque, which improves the cornering performance of the vehicle; Second, because the inner wheel has a small grip and the outer wheel has a large grip, although the torque is still evenly distributed, more torque is applied to the ground through the outer wheel, resulting in a yaw pointing in the bend. The torque helps the vehicle turn and to some extent inhibits understeer. ◠Is XDS really amazing? Objectively speaking, XDS can really improve the handling of vehicles, but if you use "magic" to describe it, it is obviously overstated. First of all, we can see from the narrative of the official website that XDS is based on the extended function of ESP. Today's mainstream ESP system has the function of independently braking four wheels, which means that it is already on the hardware. The key to having XDS conditions is the upgrade of the software.
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