Even among Citroen users, many people are not very clear about its rear wheel follow-up steering. In fact, this function is extremely simple in principle. For all Citroen models (which should be installed on Peugeot cars, because they are now merged into PSA Group), when installing the rear axle, the connection between the rear axle assembly and the car body adopts a specially designed self-deflection elastic pad, so the rear axle has the follow-up steering function. When the car turns, the elastic cushion block is deformed under the lateral force caused by centrifugal force, and as a result, the rear axle assembly will automatically deflect an angle along with the rotation direction of the front wheel on the horizontal plane, which increases the steering characteristics of the car (reduces the understeer). If you know physics, you will understand that because the rear axle assembly deflects with the rotation direction of the front wheel, the resultant force of the lateral force and the forward force caused by centrifugal force is more inclined to the rotation direction of the front wheel, so that you can turn more easily at the same camber angle without slowing down too much. Forget physics and review the decomposition and synthesis of force:)
As for the turning radius, it is not determined by this.
Due to the above reasons, vehicles adopting rear wheel follow-up technology can turn at a higher speed and a more stable speed than other vehicles. Here, what is more significant is that the realization of this technology is extremely simple, but because it is a patented technology of Citroen, other manufacturers can't use it, so either give up this improvement or adopt more complicated and expensive technology to realize it, so the cost of the car has increased a lot.
In fact, the follow-up steering of the rear wheel only works when turning. Because cars almost never walk in a straight line, in fact, at almost any time, this technology makes cars more stable, easier to operate, and the cost has not increased. Fukang, Elysee, etc.100000 models can easily run to 200km/h high-speed and be stable and impartial, which is determined by Citroen's excellent chassis characteristics, including the credit of rear wheel follow-up steering. Every century-old automobile manufacturer will have its own advanced and mature technology, and it will take a long time for later manufacturers to learn and master it.