Cars, cars, express trains. What do you mean, cars?

Car car means, car, vehicle. China's latest national standard "Terms and Definitions of Types of Cars and Trailers" (GB/T 3730.1-2001) defines a car as a vehicle with four or more wheels driven by power.

Mainly used for: carrying people and/or goods; Towing vehicles carrying people and/or goods; Special purpose.

1885 is a decisive breakthrough in automobile invention. Ben Ci, who was in the same factory as Daimler at that time, was also studying cars. 1885, he and Daimler built a gasoline engine almost at the same time, installed it on a car, and drove at a speed of 12 km/h, which was successful.

This year, the British housekeeper also invented a car with a gasoline engine. In addition, Bernard of Italy also invented the automobile, and Puchilov and Vorobov of Russia invented the internal combustion engine automobile.

Automobile acceleration time classification

1, in-situ start acceleration time, also called in-situ shift acceleration time. It refers to the time required for the car to reach the predetermined speed or distance after starting from the first gear in a static state and gradually shifting to the top gear with the greatest acceleration intensity (including full throttle and choosing the most appropriate shift timing). At present, the time (seconds) required for 0-96 km is often used to evaluate.

2. Overtaking acceleration time refers to the time required to accelerate from a certain speed to a certain high speed with the highest grade or second grade in order to improve the average driving performance of the car, which is used to express the acceleration ability of the car when overtaking.

At present, the time (seconds) required for 48- 1 12 km/h is commonly used to evaluate. The acceleration time of the car has a certain influence on improving the average driving speed of the car. Especially when driving, it is often necessary to deal with related emergencies with maximum acceleration. For example, the importance of acceleration can be reflected at the moment when the intersection starts and the expressway overtakes.

The driver's vision and sight distance;

Visual field refers to the whole range that can be seen at the same time with the same line of sight. Visual field can be divided into dynamic and static visual field: dynamic visual field refers to the spatial range that fingers and eyeballs can see without moving; Static visual field is the spatial range that the eyeball can see freely when the head is still. Dynamic visual field is inversely proportional to vehicle speed. The faster the vehicle speed, the narrower the field of vision.

The distance from the front of the vehicle to the front observation center is called the warning distance. It takes about 12 seconds to observe the traffic environment, judge various factors, take countermeasures and delay the braking. That is to say, if the speed is 60 km/h, the observation distance should be 200 meters.