When you step on the motorcycle, in addition to turning the throttle and screaming on the road, the knight will inevitably be subject to external factors on the roads of people, cars and things, and will be slowed down. Especially in the event of a critical situation, always pull down the brake lever intuitively, hoping to stop the motorcycle as soon as possible, but the tire's grip is limited, if the direct application of excessive braking force will cause the tire to lock up, plus The general motorcycle is designed for two rounds. If one of the wheels is locked or even two wheels are locked, the motorcycle will be difficult to control, and it is easy to lose balance and fall and accident.
When a motorcycle is driving on a straight road in a critical situation, the braking force that the tire can withstand is much larger than that on a curved road. This is because the grip between the tire and the ground is not only provided when the vehicle is driven. The decelerating longitudinal force also needs to be provided to the lateral force of the vehicle during cornering (steering). If the longitudinal force of the vehicle is added to the lateral force, the maximum force of the two forces can be drawn into a circle. This circle is regarded as the space of the gripping force available for the tire. Under the same road conditions, the tire will not lock as long as the applied braking force does not exceed the range of the circle. Once the circle is exceeded, the tire will lock. Dead and slippery conditions.
Slow down before cornering, avoid braking when cornering
The Cam of the tire.
The picture above shows the tire circle (Kamm Circle, also known as Heli Circle). For the sake of understanding, we can assume that under one condition, the maximum grip of the tire is 10, which is the Cam circle of the yellow circle in Figure 1. If a motorcycle is to be safely driven on a road, the combined force of its longitudinal force (because of acceleration/deceleration) and lateral force (because of turning) must be below 10, and if it exceeds 10, it will cause the tire to lock or slip. Close to 10 represents the limit of the grip of the tire. Because there is no extra grip, the control of the motorcycle will become unstable, just like walking on the cliff. As long as a little extra movement may exceed 10 That is, causing the motorcycle to slip or fall.
For example, if the motorcycle is driving in a critical situation and is in an emergency, if the longitudinal force used by the emergency brake is 8, then the motorcycle can be safely stopped under the control of the knight; but if the motorcycle The car is turning, and the lateral force required for cornering is already 7. If the longitudinal force of the brake is 8 during the bending process, the combined force of the longitudinal force and the lateral force has exceeded 10, so the tire will lock. Dead and slippery, coupled with the motorcycle's cornering with the body tilt angle, which caused the Cavaliers and motorcycles to fall directly and accidents.
Therefore, knowing the grip of the Came circle, you can know that you should not try to brake the car in the corner. Otherwise, it is easy to cause the motorcycle to be unstable or the tire to lock and slip. In order to avoid the emergency braking in the corner, you should make sure before the corner. Complete the deceleration and let the tire's grip be used to bend.
The risk of emergency braking in the cognitive circle of the tires of the tires can further extend the high risk of the simultaneous action of the motorcycle during the road driving, the emergency braking and the dodging, and the action of the motorcycle in avoiding obstacles in front. The cornering is similar, sometimes it is a sharp turn, and most of the lateral force is used. The emergency braking will use most of the longitudinal force, so whether it is dodging during emergency braking or emergency braking when dodging, there is A considerable opportunity creates instability in the Cavaliers and locks or slips the tires, significantly increasing the risk of falling.
Develop a habit of risk prediction, control speed at any time to avoid risk
Some people may ask how the promotion of driving technology should be able to control the remedy? In fact, the opportunities and pipelines for improving driving skills are generally limited, and the environmental changes are complicated when dangerous situations occur. It is impossible to use the simple driving training environment to implement the concept of defensive driving to understand the characteristics of people, vehicles and roads in the traffic environment. Develop the habit of risk prediction and improve the ability of risk prediction, that is to say, the habits and abilities of speed control at any time during driving, and the location of cognitive dangers to avoid danger.
There is a turning car intersection in front.
The above picture is an example. The motorcycle is a straight-through vehicle. When you see a car in front of you, you are going to turn left or attempt to turn left. Although in this situation, the motorcycle usually has priority rights, but to protect yourself from the perspective of driving. The road concept), it is recommended that the motorcycle should be released in advance when the motorcycle meets the intersection and prepare for the brakes. Naturally, the speed of passing the intersection can also be used in advance to respond to the behavior of the passers-by, avoiding the car to turn left quickly and must be urgent. Braking or emergency avoidance, causing the problems in this article, not letting yourself into a high-risk traffic dilemma, naturally driving safely.
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