Tire inflation process pressure detection method and automatic inflation method and tire inflation pump

Abstract

The present application provides a correction method and an air pump using the method to solve the problem of deviation between the inflation pressure and the actual tire pressure during tire inflation, which can greatly reduce the error between the pressure displayed by the pressure gauge and the actual tire pressure during inflation, and thus can realize the functions of automatic inflation and stop of the tire.

Description

Technical Field

[0001] This invention relates to a vehicle tire inflation device, and more particularly to a tire inflation process pressure detection method, an automatic inflation method, and a tire inflation pump. Background Technology

[0002] Tire pressure directly affects a vehicle's safety performance, fuel economy, and tire life. Normal tire pressure for a car is generally between 33.5 and 36.3 psi. Tire pressure that is too low or too high can affect the performance of the vehicle's suspension and steering systems, and even increase the risk of tire blowout.

[0003] Different tires have different rated maximum tire pressures, so it's crucial to ensure the correct pressure is applied when inflating vehicle tires. Currently, there are 12V or 24V vehicle air pumps on the market, powered by the vehicle's battery or internal battery. To use one, the owner connects the air pump to the tire using an air hose, inflating the tire through the tire valve. The hose is typically 2-10 meters long. Air pumps have high power, exceeding 300W, and a flow rate greater than 50L / min. Due to the high gas flow rate and fast velocity within the hose, a significant pressure drop occurs at both ends of the hose. Additionally, the valve core provides resistance to the gas flow, creating a pressure difference between the end of the hose and the inside of the tire during inflation.

[0004] like Figure 1 As shown, the pressure gauge on an air pump is typically installed at position 1 (on the air pump) or position 2 (at the end of the air hose near the valve stem). Due to pressure drops in the air hose and valve core, the readings on both gauges will be higher than the internal tire pressure during high-flow inflation, making it difficult for the user to determine the true tire pressure. The pressure gauge at position 1 will read 10-20 psi higher than the tire pressure, while the pressure gauge at position 2 will read 8-10 psi higher. Only when the air pump stops inflating and the pressure in the air hose and tire equalizes will the gauge reading match the true tire pressure. Since normal tire pressure is generally 30-50 psi, the maximum deviation between the inflation pressure and the actual tire pressure can exceed 60%.

[0005] Because regardless of whether the pressure gauge of the air pump is installed at position 1 or position 2, the inflation pressure measured during the air pump inflation process will be different from the actual pressure inside the tire, and the deviation is large, the existing air pump is difficult to achieve the function of automatically stopping inflation after the tire is inflated to the preset pressure. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a tire inflator pump, comprising a pressure sensing unit and a control unit; wherein the pressure sensing unit is configured to detect the inflation pressure and transmit the measured pressure value to the control unit; the control unit is configured to receive the measured pressure value and pause the pump motor n times during the inflation process, where n≥3, and substitute the measured pressure values ​​of any three of the n times and the pressure value measured at the instant before or after each pause into the functional relationship between the actual tire pressure P and the inflation pressure P0, P=aP0. 2 +bP0+c, calculate the coefficients a, b, and c, thereby determining the functional relationship and calculating the actual tire pressure P at any time during the inflation process based on the functional relationship.

[0007] Furthermore, the pause time is 1 second.

[0008] Furthermore, it also includes a display device for displaying the actual tire pressure P.

[0009] Furthermore, the control unit is set to stop the air pump when the actual tire pressure P reaches the preset maximum tire pressure.

[0010] Furthermore, the pressure sensing unit is installed on the air pump body or on the air pipe connected to the air pump body.

[0011] This invention also provides a method for detecting tire inflation pressure, comprising the steps of: detecting inflation pressure to obtain a measured pressure value; pausing the air pump motor n times during the inflation process, where n≥3, and substituting the measured pressure values ​​of any three of the n times and the pressure value measured at the instant before or after each pause into the functional relationship between the actual tire pressure P and the inflation pressure P0, P=aP0. 2 +bP0+c, calculate the coefficients a, b, and c; calculate the actual tire pressure P at any moment during the inflation process based on this functional relationship.

[0012] Furthermore, the pause time is 1 second.

[0013] This invention also provides an automatic tire inflation method, comprising the steps of: detecting inflation pressure to obtain a measured pressure value; pausing the air pump motor n times during the inflation process, where n≥3, and substituting the measured pressure values ​​of any three of the n times and the pressure value measured at the instant before or after each pause into the functional relationship between the actual tire pressure P and the inflation pressure P0, P=aP0. 2 +bP0+c, calculate the coefficients a, b, and c; stop the air pump when the actual tire pressure P reaches the preset maximum tire pressure.

[0014] Furthermore, the pause time is 1 second.

[0015] This invention addresses the problem of discrepancies between measured pressure and actual tire pressure during tire inflation by providing a correction method and an air pump using this method. This method can significantly reduce the error between the pressure displayed on the pressure gauge and the actual tire pressure during inflation, thereby enabling automatic tire inflation and stopping.

[0016] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the location of the pressure gauge on a tire inflator pump in the prior art;

[0018] Figure 2 This is a graph showing the functional relationship between inflation pressure and actual tire pressure during the inflation process in a preferred embodiment of the present invention. Detailed Implementation

[0019] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0020] like Figure 2 As shown in the figure, tests revealed that the relationship between the actual tire pressure P and the inflation pressure P0 during tire inflation is a quadratic curve, and its functional expression is:

[0021] P = aP0 2 +bP0+c(1)

[0022] For a quadratic function curve, the coefficients a, b, and c can be determined with the coordinates of at least three points, thus defining the function. Since the pressure measured when the air pump stops inflating is consistent with the actual tire pressure, we can measure the actual tire pressure by briefly pausing the inflation process. For example... Figure 2 As shown in the figure, the vertical axis represents the actual tire pressure P, and the horizontal axis represents the inflation pressure P0. In this embodiment, the pressure P0 is measured at P0 and P0 respectively. 01 P 02 and P 03 The inflation is paused for approximately one second at each of the three points. The pressure measured after inflation stops is the actual pressure at each point, P1, P2, and P3. The actual pressure measured at each point, either immediately before or immediately after the pause, is the measured pressure P0 at that point. Figure 2 The measured pressure and actual pressure values ​​at the three points are shown in Table 1:

[0023] Table 1

[0024]

[0025] Substituting the values ​​of the above three points into equation (1), we can obtain the coefficients a = -0.0151, b = 3.3387, and c = 93.829 in the functional relationship (2) between the actual tire pressure P0 and the measured pressure P; then the functional relationship is:

[0026] P = -0.0151P0 2 +3.3387P0-93.829

[0027] Its function curve is as follows Figure 2 As shown by the dashed line. Therefore, we can calculate the actual tire pressure at any given moment based on the measured pressure, and use the actual pressure instead of the measured pressure for display or to further control the inflation process based on this.

[0028] In actual use, different tire sizes and different air pipe lengths will affect the calculated values ​​of coefficients a, b, and c in the functional relationship.

[0029] Of course, in other embodiments, the parameters of the functional relationship can be further corrected by multiple pauses to make it more accurate. In practical use, by adjusting the time interval between each short pause, the error between the measured pressure and the actual tire pressure can be controlled within 2 psi, that is, the maximum deviation does not exceed 5% of the actual tire pressure.

[0030] To apply this method, the air pump according to the present invention should at least have a pressure sensing device and a control unit. The pressure sensing device can be located on the outside of the tire, such as on the air pump, as in the prior art. The pressure sensing device transmits the pressure signal to the control unit. The control unit can be a programmable controller such as an MCU or PLC. The control unit receives the pressure signal transmitted by the pressure sensing device and controls the start and stop of the air pump motor via, for example, a relay, according to the above method, and calculates the real-time calculated pressure. The air pump according to the present invention generally also includes a display device, such as a numerical display device, for displaying the calculated real-time pressure. Furthermore, since the present invention can greatly reduce the error between the calculated pressure and the actual pressure, the maximum inflation pressure can also be set through the control unit, and the air pump can be controlled to automatically stop inflation when the tire pressure reaches the maximum pressure.

[0031] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A tire inflator pump, characterized in that, It includes a pressure sensing unit and a control unit; the pressure sensing unit is configured to detect the inflation pressure and transmit the measured pressure value to the control unit; the control unit is configured to receive the measured pressure value and pause the air pump motor n times during the inflation process, where n≥3, and substitute the measured pressure value of any three of the n times and the pressure value measured at the instant before or after each pause into the functional relationship between the actual tire pressure P and the inflation pressure P0, P=aP0. 2 +bP0+c, calculate the coefficients a, b, and c, thereby determining the functional relationship and calculating the actual tire pressure P at any time during the inflation process based on the functional relationship.

2. The tire inflator as described in claim 1, wherein, The pause time is 1 second.

3. The tire inflator as described in claim 1, wherein, It also includes a display device for showing the actual tire pressure P.

4. The tire inflator as described in claim 1, wherein, The control unit is set to stop the air pump when the actual tire pressure P reaches the preset maximum tire pressure.

5. The tire inflator as described in claim 1, wherein, The pressure sensing unit is located on the air pump body or on the air pipe connected to the air pump body.

6. A method for detecting pressure during tire inflation, characterized in that, Including the following steps: The inflation pressure is measured to obtain the actual pressure value; During inflation, the air pump motor is paused n times, where n≥3. The measured pressure values ​​from any three of these n pauses, along with the pressure value measured just before or after each pause, are substituted into the functional relationship between the actual tire pressure P and the inflation pressure P0: P=aP0 2 +bP0+c, calculate the coefficients a, b, and c; The actual tire pressure P at any moment during the inflation process can be calculated based on this functional relationship.

7. The tire inflation pressure detection method as described in claim 6, wherein, The pause time is 1 second.

8. A method for automatically inflating a tire, characterized in that, Including the following steps: The inflation pressure is measured to obtain the actual pressure value; During inflation, the air pump motor is paused n times, where n≥3. The measured pressure values ​​from any three of these n pauses, along with the pressure value measured just before or after each pause, are substituted into the functional relationship between the actual tire pressure P and the inflation pressure P0: P=aP0 2 +bP0+c, calculate the coefficients a, b, and c; The air pump stops when the actual tire pressure P reaches the preset maximum tire pressure.

9. The tire inflation pressure detection method as described in claim 8, wherein, The pause time is 1 second.

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