Drive when the weather is fine.

It is because of the principle of thermal expansion and cold contraction. When the weather is hot in summer, the surface temperature will be very hot, and the tire pressure will rise due to the principle of thermal expansion and cold contraction. In order to prevent the vehicle from having a flat tire, check the condition of the vehicle carefully before driving. Butyl rubber is commonly used in ordinary radial tires, which will melt at the temperature of 190 degrees Celsius, but the tensile strength of tires will also decrease with the increase of temperature. When the tire rises from 0 to 100℃, the strength will drop by nearly 20%, and when the temperature rises to 1 10℃, the strength will start to drop sharply.

In fact, this kind of worry is unnecessary. The tire pressure of most passenger cars is between 2.2 and 2.5 bar. Note: this value is the tire pressure value when the car is cold, not the highest value after the tire is hot. The influence of tire temperature rise on tire pressure has been fully considered. You said that when your car was cold, the tire pressure was 240, and the standard unit should be 2.4 bar. This pressure should be normal.

When driving for a long distance, the tires will heat up because of the constant friction with the ground. The most intuitive reaction is that a vehicle equipped with a tire pressure sensor will see its tire temperature on the dashboard and keep rising. When the car runs at high speed, it will produce a lot of air, which can cool the tires. Now the technology is very advanced. As long as you drive normally, and make sure there are no abnormalities (cracks, bulging, low and high tire pressure, etc.). ), there will be no problem, just drive. People are often tired, and the car will not be tired.

Maybe high temperature will cause insufficient blood supply to the brain. This may be the reason why people are most likely to feel sleepy when driving for a long time in summer. Being sleepy can easily lead to fatigue driving, so this is the biggest hidden danger. It is definitely not good to drive the first pair of tires for a long time in summer, which increases the degree of wear and tear. It is easy to cause sparks and fires when the engine compartment is in working condition for a long time in summer. Secondly, driving in summer is hot, and getting used to turning on the air conditioner also increases fuel consumption.