Analysis of performance parameters
Maximum speed
The best speed a car can achieve on a well-planned road.
Minimum ground clearance
When the car is at full load, the distance between the support plane (ground) and the lowest point in the middle area of ​​the car. The minimum ground clearance reflects the ability of a car to pass through obstacles or bumpy ground without collision.
Minimum turning diameter
When the steering wheel is turned to the limit position, the center of the outer steered wheel rolls over the bearing plane diameter when the car steers at the lowest stable speed. It largely characterizes the ability of a car to pass through narrow bends or to bypass obstacles that it cannot pass. The smaller the turning diameter, the better the motor's maneuverability.
Main reduction ratio
It has a great influence on the power performance and fuel economy of the car. In general, the greater the primary reduction ratio, the stronger the acceleration performance and the gradeability, and the poorer fuel economy. However, if it is too large, the full power of the engine cannot be used to achieve the desired speed. The smaller the primary reduction ratio, the higher the maximum speed, the better the fuel economy, but the poorer acceleration and climbing ability.
Vehicle equipment quality
The quality of fully equipped vehicles, including lubricants, fuel, on-board tools, spare tires, and all other equipment.
Braking distance
The braking distance is one of the key parameters to measure the braking performance of a car. It means the distance traveled by the vehicle from the beginning of braking to when the vehicle is completely still when the vehicle is at a certain speed. .
Average fuel consumption (L/100km)
The average fuel consumption per 100 kilometers when the car is driving on the road.
Emission Standards
Vehicle emissions refer to harmful gases such as CO (carbon monoxide), HC + NOx (hydrocarbons and nitrogen oxides), and PM (particles, soot) that are emitted from the exhaust gas. From January 1, 2004, Beijing will change the exhaust emission standards for motor vehicles from the current European I to the European II, and by 2008, it will formally implement the European III standard.
Tyre type and specifications
International standard tire code, expressed in millimeters as the percentage of section height and flatness ratio, followed by: tire type code, rim diameter (inches), load index (allowable bearing quality code), allowable speed code. For example: 175/70R 14 77H where 175 represents the tire width is 175MM, 70 represents the flatness ratio of the tire section is 70%, ie the section height is 70% of the width, the rim diameter is 14 inches, the load index 77, the allowable speed is H level.
Approach angle
When the car is at full load, the front end of the car highlights the angle between the tangent line drawn by the front wheel and the ground.
Through the corner
The passability of a car is a performance index that describes the passing ability of the car, also known as off-road performance. The main parameters of the passivity are: minimum ground clearance, approach angle, departure angle, longitudinal pass angle, and transverse pass radius. The passing angle is the ability to pass obstacles when the car is fully loaded.
Departure angle
When the car is at full load, the angle between the tangent to the rear wheel and the ground at the rear end of the car.
Track distance
It is the distance between the centerline of the trajectory left on the vehicle support plane (generally the ground). If the ends of the axle are double wheels, the wheelbase is the distance between the two center planes of the two wheels. The track length of the car is divided into the front track and the rear track. The front track is the distance between the center planes of the front wheels and the rear wheel track is the distance between the center planes of the rear wheels. Both can be the same. It can also be different. In general, the wider the wheelbase, the higher the driving comfort, but some home-made cars do not have directional assistance. If the front wheels are too wide, their steering wheel will be "heavy," affecting driving comfort. In addition, the track distance also has an influence on the total width, total weight, lateral stability and safety of the car. In general, the larger the track distance, the more favorable the smoothness of the operation, and also the favorable shape of the body and the spaciousness of the carriage, the better the lateral stability. However, since the track width is wide, the total width and total weight of the automobile are also generally increased, and the problem of sluging to the side of the vehicle body is apt to occur. If the track width is too wide, it will affect the safety of the car. Therefore, the track distance should be compatible with the width of the car body.
acceleration time
The car's acceleration performance includes the car’s start-to-acceleration acceleration time and overtaking acceleration time. Acceleration time at the start is the time when the car starts from the standstill, starting from the first stop, and gradually changing to the high gear with the maximum acceleration strength (including selecting the most appropriate shift timing), to a predetermined distance or speed The time required. Currently, the time (seconds) required for 0--96 KM is usually used for evaluation. Overtaking acceleration time, the time required to accelerate to a certain high speed with the highest gear or second highest gear. The shorter the acceleration time, the better the acceleration of the car and the higher the power of the vehicle.
Drag coefficient
Air resistance is the greatest and most important external force encountered when the car is traveling. The air resistance coefficient, also known as the drag coefficient, is an important factor in calculating the air resistance of a car. It is a mathematical parameter determined by wind tunnel experiments and sliding tests, which can be used to calculate the air resistance of a car when it is driving.
Emission Standards
Vehicle emissions refer to harmful gases such as CO (carbon monoxide), HC + NOx (hydrocarbons and nitrogen oxides), and PM (particles, soot) that are emitted from the exhaust gas. From January 1, 2004, Beijing will change the exhaust emission standards for motor vehicles from the current European I to the European II, and by 2008, it will formally implement the European III standard.
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