1. The seat is the largest part in the car compartment, so in practical use, its volume should be as small as possible, its weight should be light and its cost should be low.
2. Because it is a component that supports the human body, it must meet the requirements of various standards and regulations (shape, size, strength, etc.) to ensure safety.
3. The seat should make the passengers have a good sense of static pressure, so that the passengers can maintain a natural posture of seeing things with minimal muscle activity, and colleagues should make the distribution of body pressure not hinder blood circulation and will not accelerate fatigue. Therefore, it is necessary to properly select the seat spring and pad materials, and adjust the height and front and rear position of the seat by using the seat adjustment device and backrest inclination adjustment device, so as to rationalize its functions.
4. The seat cushion surface must bear the ischial joint of the seated human body reliably, and the front corner of the seat cushion should not support the thigh. The backrest of the seat must be able to bear the reaction force of the brake pedal, and the backrest should not be tired in a long-term forward bending posture.
5. The inclination angle of the cushion can be adjusted, which can adjust the angle of human lower limbs. When driving in the urban area, the driver will change his posture with the different vehicle conditions, just like driving on the special road for automobiles, so that the center of gravity axis of the human body can easily pass through the rotation axis of the waist joint (in this state, the muscles do the least work).
6. In order to reduce the relative vibration between the seated human body and the seat back, there should be a numbered spring system.
7. The distance from the brake pedal and clutch pedal to the seat should be equal to the moving distance and angle of both feet to the bottom.