In film and television works, it is often seen that cars reverse at a very high speed, and then this professional "drift action" corrects the body and accelerates again. In real scenes, cars can really reverse so fast-that's not a problem.

Ordinary fuel-powered household scooter, its transmission is equipped with 5/6MT manual or ordinary 6/ 10AT or DCT automatic. The reverse gear of these vehicles has only one transmission ratio, and its concept is the same as that of the "reducer" of new energy vehicles; When the engine drives the reverse gear, it depends on the speed of the crankshaft to adjust the speed. To put it bluntly, it is "CVT" stepless speed change mode, which has the power to adjust the speed, so how fast the reverse gear can be depends on the highest output power and transmission ratio of the engine.

Knowledge points:

The reverse gear in direct drive mode is equivalent to the speed of 1 gear. Starting from "floor oil", the speed of 1 gear can reach about 50km, and the standard of reverse gear is basically the same. However, there is a threshold for this ratio. For example, some super sports cars, 1 gear can easily break 100. In order to ensure the safety when reversing, the reverse gear will not reach this speed. But some specially designed vehicles can be approached or even surpassed, such as the following brands and models.

Restriction option

Mercedes-Benz is equipped with some options of 7-speed wet dual clutch. There are two "gears/modes" in the reverse gear of these cars, namely, low-speed reverse gear and high-speed reverse gear. The concept is like the "double reverse gear" of a freight car. Among them, the heavy-duty traction uses low gear, and the speed of reversing is the conventional standard; High-speed reverse gear is mainly used by skilled drivers or in emergencies-the top speed can reach 80km/h, and the high standard of car crash test speed is only 64km/h, which is already very high.

Don't give an example: some new energy vehicles and hybrid vehicles have no speed limit in reverse gear.

The drive system of new energy vehicles is mainly electric motor, which is naturally "single-speed direct drive" when reversing. However, the internal combustion engine can only reach the low speed range of about 6500 rpm, and the output power is not very high in theory and practice. But the motor is a high-speed engine, which can easily reach 1.5 ~ 20000 rpm. If there is no program speed limit for this machine to directly drive reversing, the maximum reversing speed of the vehicle can exceed 100km.

Summary:

In fact, the reversing speed of the car is not low, and even the standard of about 50km for ordinary scooters has been exaggerated. Because the untrained driver can't stably control the posture of the car body when reversing at high speed, the state of reversing is like "driving a forklift backwards", which is a difficult action that even professional forklift drivers can't do. So don't try to do any stunts when reversing. Car insurance 100% can refuse to pay for traffic accidents caused by this driving mode-because it belongs to dangerous driving crime (criminal law).