What are the performance requirements of cars? What are the indicators of each performance requirement?

The first is irregular frequency vibration.

This evaluation is mainly to observe the irregular pitching, jumping and vibration of the car. It is worth noting that the frequency of pitch and jump actions evaluated by irregular frequency vibration is higher than that defined by the main ride control. Generally around 4 to 10 Hz.

The second aspect is the vibration with fixed frequency.

Appraisers feel and observe the harmonious vibration of automobile body, subframe, suspension, power transmission and seat, and also need to consider the vibration of door trim, seat armrest, headrest and other components. For the occupants, the vibration with fixed frequency can be evaluated from three aspects. The first is the constant frequency vibration of steering wheel (the vibration of steering wheel and steering column is used to compare the vibration of car body, Fuxuan frame, wheels and powertrain), the second is the constant frequency vibration of floor (the vibration of floor is used to evaluate the vibration of suspension, frame and powertrain), and the third is the constant frequency vibration of seat (the vibration of seat cushion and backrest is used to evaluate the vibration of car body, subframe, suspension and powertrain).

The third aspect is the sense of road.

The so-called sense of road is the intuitive judgment of the shape and material of the road surface caused by the vibration of the floor, steering wheel, seat and seat armrest felt or seen by people's hands, feet and other body parts. This can be comprehensively evaluated from three aspects. The first is the touch of the steering wheel, the second is the touch of the floor, and the third is the touch of the seat. Through these, we can evaluate the driver's feeling when the road passes through the vehicle.

The fourth aspect is road noise.

The essence of so-called road noise refers to the driving sound and feeling transmitted to the driver by the tires when the car is running normally. This mainly focuses on whether the sound quality is harmonious and whether the volume is high or low.