01 tyre pressure management
Ensuring pressure norms
Pressure on car tyres is critical. Effective exposure of tyres to the ground can be ensured only if the pressure of tyres is kept within standard limits, thus enhancing the grip. This will not only help to extend the useful life of tyres, but also improve the brake effect, stability at turn and the comfort of driving。
Tyre pressures that go beyond the standard range, whether too low or too high, can lead to irregular wear and tear, thereby threatening the safety of the vehicle, as shown in the figure below。
Routine values of tyre pressure can normally be found in maintenance manuals or look at labels of rpgs on the driver's side of column b。
Check pressure steps
Next, we'll show you how to check the tire pressure. Prepare the tire pressure table. Such instruments can be used not only to detect whether the pneumatic pressure of tyres meets the standard standards, but also to inflate excess tyres。
Ensure that tyres are in a cold state, i. E. At least three hours of parking or a distance of 1. 6 km. In this state, the pressure table of the tyre is linked to the tyre's gas door and the measurements are performed, as shown in the following graphics。
Zero-two
In order to ensure that tyres are evenly worn and extend their useful life, the owner of the vehicle should follow the recommendations in the vehicle usage manual and change the tyre after reaching a specific mileage. For pre-engine, front-wheel-drive models, the rotation of tyres requires special attention。
The pre-engine, rear-wheel-drive vehicle type, whose tyre exchange method also requires special attention。
Particular attention is paid to directional requirements for tyre switching techniques. Tyres with directional requirements are usually marked with an arrow symbol on the side wall to indicate the direction of the tyre. When changing tyres, it is important to ensure that the direction of arrows on the side walls of tyres is consistent with that of cars。
03 tyre wear and measurement
The wear mark
As tyres wear and tear, their grip on turns diminishes, especially when they travel on wet slides, which may lead to slippages, thereby threatening the safety of the vehicle. Therefore, it is generally recommended to avoid the use of tires with dyslexia depths below 1. 6 mm。
In order to help the driver keep up to date with the wear and tear of tyres, wear and tear markings are usually placed on the tyres. These marks are usually located on the wall and are marked by the symbol “twi” or the letter “tire wear indicator”。
When the tyre's tread is worn to a depth of less than 1. 6 mm, its wear marks appear. Once the tires are examined, the tires are worn and these signs are shown, and in order to ensure the safety of the vehicle, the replacement of the new tyres should proceed immediately。
Flower depth measurement
Periodic depth measurements of tyres are an important element in understanding the state of wear and tear and in ensuring the safety of motor vehicles. Measurements allow for timely identification of differences between the wear and tear of one tyre and others, leading to timely decision-making on replacement. And then we're going to introduce the depth of tires and how it works。
04 tyre pressure monitoring system
Tyre pressure monitoring systems directly measure the pressure of tyres by installing pressure sensors inside each tyre. These sensors use wireless transmitters to transmit pressure information from the inside of tyres to the central receiver module, thus displaying pressure data for each tyre。
Next, we'll take the jaguar xj car as an example of how the system is constructed。
Tyre pressure monitoring systems respond immediately when there is an abnormal pressure of a tyre, such as too low, too high or fast to leak, and alert drivers through a “team pressure abnormality” light on the dashboard. This function is designed to detect potential tyre hazards in a timely manner and to alert drivers to take the necessary measures to prevent potential accidents。
Following the replacement of pressure sensors for tyres or the rotation of vehicles, re-engineering is necessary to ensure the accuracy and stability of tyre pressure monitoring systems. This operation is designed to help the system re-identify and remember pressure sensor signals for each tyre, thereby achieving real-time monitoring and early warning of tyre state。
05 wheel balance
Car wheels, combined with tyres and wheels, are difficult to achieve absolute even mass distribution. In high-speed travel, the cycling imbalance of the wheel leads to wheel shaking and directional vibrating, which not only affects the comfort of the driving but also threatens the safety of the driving. In order to deal with this problem, we have adopted an increased weighting method, calibrating when the wheel moves and ensuring the balance of its peripheral parts, a process that is called the dynamic balance. The balance is particularly important when:
Rebalancing becomes particularly important when new tyres are replaced or repaired by collisions。
Balancing can also play a key role when wheel tyres are ploughed on one side。
When driving, the wheel is overweight or shivering, which is often the expression of an imbalance in wheeling and requires a timely, dynamic and balanced correction。
When the vehicle is travelling along a straight line, there is a left-hand or right-right deviation, which may also be due to an imbalance in wheeling。
In order to check the balance of wheels, it is necessary to use specialized wheel balancing machines. Such a machine can measure the imbalance in the wheel and indicate the exact location of the imbalance. Based on the results of the balancing machine measurements, the maintenance staff were able to balance the school wheel。
The processes of the wheel balancers include:
(1) first, there is a need to remove all balance blocks from the wheel to be tested。
(2) the accuracy of the machine shall be checked before the wheel is installed on the balancing machine。
(3) select the appropriate adapter and place the wheel firmly on the balancing machine to ensure that the adaptor is tight in order to prevent relaxation。
(4) next, the rim width and diameter of the surveyed wheels are measured and these measurements are accurately entered into the kinetic counter。
(5) it is important to remove the impurities in the tyre strips of the detected vehicle before starting the balance。
(6) the balance of appropriate weights is then accurately installed at the intended location on the outer side of the wheel, based on the results of the test of the motor balancing machine。
(7) similarly, according to the instructions of the balancing machine, the appropriate mass balance blocks are assembled at a specified location on the inside side of the wheel。
Six four rounds
The vehicle should be installed at the relative location established by the manufacturer, on four rounds, on the transfer to the agency and between the axes. This repositioning and restoration is referred to as wheel positioning。
Repositioning of the wheel should be done through a four-wheel locator after an accident with the vehicle caused damage to the chassis or suspension system, abnormal wear and tear of the tyre or replacement of the suspension parts。
