What is The Relationship between Tire Pressure and Automobile Performance?

In a strict sense, tire pressure refers to the air pressure inside the tire. The tire pressure is closely related to the automobile performance, such as comfort and carrying capacity, and it also affects the life of the tire.

Air pressure is of vital importance to a tire. Too high or too low pressure will shorten the service life of the tire. If the air pressure is too low, the carcass deformation will increase, the sidewall will be prone to cracks, and at the same time, the flexing motion will cause excessive heating, which will cause the rubber to age, the ply fatigue and the cord to break. It will also causes the tire grounding area increasing, and the tire wear will be accelerated. If the air pressure is too high, the tire cord will be excessively stretched and deformed, and the elasticity of the carcass will decrease, which will increase the load on the car during driving. If there is an impact, it will cause internal cracking and blasting. Too high air pressure will also accelerate the automobile crown wear and reduce rolling resistance.

1. The relationship between tire pressure and load capacity

Tire pressure is a sign of car load capacity. The amount of the car load depends on the level of the tire pressure. According to the relationship between the load index of the tire, the tire pressure and the tire load capacity, the higher the tire pressure, the greater the load capacity, the smaller the tire pressure, the smaller the load capacity. For example, a tire bearing a load index of 80 has a load capacity of 300 kg when the air pressure is 0.15 MPa, and a load capacity of 450 kg when the air pressure is 0.25 MPa. It can be seen that the influence of tire pressure on the load capacity of the vehicle is quite large. 

2. The relationship between tire pressure and automobile dynamic performance

When a car is traveling at a constant speed on a horizontal road, it must overcome the rolling resistance from the ground and the resistance from the air, and the tire pressure has a great influence on the rolling resistance coefficient. When the air pressure is lowered, the rolling resistance coefficient will rapidly increase, because if the tire pressure is lowered, the rolling tire is deformed greatly, and the hysteresis loss is increased. Therefore, proper tire pressure is a guarantee of good automobile dynamic performance. 

3. The relationship between tire pressure and automobile driving smoothness

The automobile driving smoothness is directly related to the comfort of the driver and passenger. In fact, the way in which the tire is inflated has greatly improved the driving comfort of the vehicle. Imagine if the tires are made of rigid or solid elastic tires, the comfort level will definitely be greatly reduced. Therefore, improper selection of the pneumatic tire's air pressure will also reduce its comfort. When the air pressure is too high, the rigidity of the tire is enhanced, the vibration frequency of the vehicle is increased, and the rideability is deteriorated. Properly lowering the air pressure can make it smoother. If the tire pressure is too low, it will affect other performance of the vehicle. 

Therefore, the tire pressure monitor system, which is also called TPMS, is really important to the vehicle. Generally, the tire pressure should be checked at least once a month. Every time the season changes, you should pay attention to adjusting the tire pressure. The ideal adjustment time is in November and May. In November, it basically enters the winter. The tire pressure is usually reduced. You should adjust it slightly. The weather began to heat up in May. It is recommended to check whether the air pressure is normal. In particular, please note that as long as the tire pressure is not higher than the standard range, do not deliberately reduce the tire pressure. If the tire is not short of air, there is no need to adjust every month.