CN103303078A - Tire pressure monitoring system self-adapted to altitude - Google Patents

Abstract

The invention provides a tire pressure monitoring system self-adapted to altitude. The tire pressure monitoring system at least comprises a sensor module, a receiver and an air pressure sensor, wherein the sensor module is arranged inside a tire; the receiver is mounted in a cab; the sensor module and the receiver are in communication connection in a wireless radio frequency manner; the air pressure sensor is connected with the receiver. According to the tire pressure monitoring system disclosed by the invention, an accurate tire pressure value can be obtained through correcting an absolute pressure value of the tire, so that the accurate monitoring of the tire pressure is realized and the driving safety is improved.

Description

Altitude Adaptive Tire Pressure Monitoring System

technical field

The invention relates to a tire pressure monitoring system in the field of automotive electronics, in particular to a tire pressure monitoring system adaptive to altitude.

Background technique

The tire pressure monitoring system (Tire Pressure Monitoring System, TPMS) realizes real-time monitoring of tire pressure through the tire pressure sensing unit and tire pressure monitoring unit using radio frequency communication. TPMS is mainly composed of two parts, the first part is the sensor, which is installed inside the tire and fixed on the wheel hub through the valve, which can monitor the temperature, pressure and acceleration of the tire in real time; the second part is the receiver, which is installed in the cockpit Inside, the wireless signal sent by the sensor can be received, and the current tire pressure, temperature and fault conditions can be obtained through calculation and analysis, so that the driver can understand the condition of the tire. Among them, the signal transmission between the sensor and the receiver is carried out through high-frequency wireless signals.

Tires are an important part of the driving mechanism of a car. They not only carry the entire mass of the car, but also provide impetus for the car to move forward, and play a role in easing the impact of the ground. TPMS can monitor the tires in real time, so as to remind the driver of potential safety hazards and prevent accidents in advance.

Currently the most widely used is the built-in direct TPMS. It can accurately measure the pressure inside the tire and transmit the tire pressure wirelessly to the receiver on the car. However, this system has an inherent disadvantage that the pressure measured is only the absolute pressure inside the tire. The tire pressure we actually need and what we usually say refers to relative pressure, that is to say, the value obtained by subtracting the external atmospheric pressure from the absolute pressure inside the tire. The common practice now is to subtract 1.00bar from the measured tire absolute pressure. This is because the atmospheric pressure outside is 1, and there is nothing wrong with such an algorithm in plain areas or areas with an altitude difference of several hundred meters. But when the altitude reaches 4 or 5 kilometers, the actual external atmospheric pressure is only 0.60bar to 0.50bar. If you subtract 1.00bar from the measured tire absolute pressure, the result will be 0.40bar to 0.50bar lower than the actual value. . For a vehicle with a standard tire pressure of 2.50bar, this is an error of about 20%, which is already close to the alarm threshold of the national standard.

At present, the recommended draft of the national standard points out that when the tire pressure deviates from the standard pressure by 25%, the TPMS will alarm if the pressure is too low or too high. As the altitude changes, the value of the external atmospheric pressure also changes accordingly, and the tire pressure of the same tire at different altitudes is also different. On the basis of the absolute pressure inside the tire, a uniform subtraction of 1.00bar will directly lead to wrong results when the altitude changes, resulting in false alarms. For example, many users report that after the TPMS bought on the market alarms, the tire pressure measured by the pressure gauge is normal, and there is a big difference from the displayed value of the TPMS, especially in the case of the TPMS used in high altitude areas. This undoubtedly brings certain troubles to the safe driving of the car.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an adaptive tire pressure monitoring system, which can obtain accurate tire pressure values by correcting the absolute tire pressure values, thereby realizing accurate tire pressure Monitoring improves driving safety.

To achieve the above purpose and other related purposes, the present invention provides an altitude-adaptive tire pressure monitoring system, the tire pressure monitoring system at least includes: a sensor module, a receiver and an air pressure sensor, wherein the sensor module is set Inside the tire, the receiver is installed in the cockpit; the sensor module and the receiver are connected through wireless radio frequency, and the air pressure sensor is connected with the receiver.

According to the above-mentioned tire pressure monitoring system adaptive to altitude, wherein: the sensor module is integrated with a microprocessor, a pressure sensor, a temperature sensor, an acceleration sensor, a battery voltage sensor and a radio frequency transmitting circuit.

According to the above-mentioned altitude-adaptive tire pressure monitoring system, wherein: the receiver includes a microprocessor, a radio frequency receiving circuit and a display device.

Further, according to the above-mentioned altitude-adaptive tire pressure monitoring system, wherein: the display device includes LED or LCD.

Further, according to the above-mentioned altitude-adaptive tire pressure monitoring system, wherein: the receiver further includes an alarm device.

According to the above altitude adaptive tire pressure monitoring system, wherein: the air pressure sensor is installed inside the receiver.

As mentioned above, the adaptive altitude tire pressure monitoring system of the present invention has the following beneficial effects by accurately calculating real-time tire pressure values:

(1) Effectively prevent tire blowout;

(2) Effectively avoid tire damage caused by running flat;

(3) Effectively avoid fuel consumption increase;

(4) It can ensure the best handling performance of the vehicle;

(5) Avoid abnormal wear and tear of vehicle components.

Description of drawings

FIG. 1 is a schematic structural diagram of an altitude-adaptive tire pressure monitoring system of the present invention.

Component designation description

1 sensor module

2 tires

3 Receiver

4 Air pressure sensor

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Referring to FIG. 1 , the tire pressure monitoring system of the present invention includes a sensor module 1 , a receiver 3 and an air pressure sensor 4 .

Wherein, the sensor module 1 is arranged inside the tire 2 and fixed on the hub through the valve. The sensor module 1 integrates a microprocessor, a pressure sensor, a temperature sensor, an acceleration sensor, a battery voltage sensor and a radio frequency transmitting circuit, thereby being able to monitor tire pressure, temperature, acceleration and the like in real time. Specifically, the acceleration sensor is used to measure the acceleration of the vehicle to determine whether the vehicle is in a driving state, so as to adjust the working mode of the sensor module 1 and make it suitable for different environments. The pressure sensor and temperature sensor are used to measure the tire pressure and the temperature inside the tire respectively, so that the driver can know the running condition of the tire. The battery voltage sensor is used to measure the service life of the sensor module 1, reminding the driver to replace the sensor module 1 in time, thereby avoiding the function failure of the tire pressure monitoring system adaptive to the altitude of the present invention. The radio frequency transmitting circuit is used to transmit the relevant information measured by the sensor module 1 to the receiver 3 through radio frequency.

Receiver 3 is installed in the cockpit, and it includes microprocessor, radio frequency receiving circuit and display device, can show current tire pressure, temperature and failure situation, and when tire leaks and pressure variation exceeds safety threshold, give the alarm, with Ensure driving safety. The display device can simultaneously display the pressure and fault conditions of the four tires of the vehicle, as shown in Figure 1, the left rear wheel is in a low pressure state.

Preferably, in the present invention, the display device in the receiver 3 can be LED or LCD. The receiver 3 uses an alarm device such as a buzzer to alarm.

The air pressure sensor 4 is connected with the receiver 3 and can be installed inside the receiver 3 for real-time measurement of the outside air pressure, and transmits the measured outside air pressure value to the receiver 3 .

In the present invention, the final tire pressure value we need is obtained by subtracting the external air pressure value measured by the air pressure sensor from the tire absolute pressure value measured by the sensor module. Therefore, the tire pressure monitoring system of the self-adaptive altitude of the present invention adopts the following steps to measure the tire pressure value in real time:

(1) The sensor module measures the tire absolute pressure value in the vehicle tire, and sends out the tire absolute pressure value through the radio frequency transmitting circuit on it; the air pressure sensor measures the external air pressure value in real time;

(2) The receiver receives the above tire absolute pressure value and external air pressure value;

(3) The microprocessor of the receiver obtains the real-time tire pressure value by subtracting the absolute tire pressure value from the outside air pressure value.

It should be noted that the system for correcting the measured tire pressure value by adding an air pressure sensor includes but is not limited to the module form described in this patent specification. Any system that corrects the tire pressure by directly or indirectly measuring the outside air pressure is within the protection scope of the present invention. This measure allows the vehicle to accurately measure the tire pressure and give an alarm without human intervention between different altitudes.

In summary, the tire pressure monitoring system adaptive to altitude of the present invention obtains accurate tire pressure values by correcting the absolute pressure values of tires by using an air pressure sensor, thereby realizing accurate tire pressure monitoring and improving driving safety. safety. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (6)

1. A tire pressure monitoring system adaptive to altitude, characterized in that the tire pressure monitoring system at least comprises: a sensor module, a receiver and an air pressure sensor, wherein the sensor module is arranged inside the tire, and the The receiver is installed in the cockpit; the sensor module and the receiver are connected through wireless radio frequency, and the air pressure sensor is connected with the receiver. 2. The altitude-adaptive tire pressure monitoring system according to claim 1, wherein the sensor module is integrated with a microprocessor, a pressure sensor, a temperature sensor, an acceleration sensor, a battery voltage sensor and a radio frequency transmitting circuit. 3. The altitude-adaptive tire pressure monitoring system according to claim 1, wherein the receiver comprises a microprocessor, a radio frequency receiving circuit and a display device. 4. The altitude-adaptive tire pressure monitoring system according to claim 3, wherein the display device comprises LED or LCD. 5. The altitude-adaptive tire pressure monitoring system according to claim 3, characterized in that: the receiver further comprises an alarm device. 6. The altitude-adaptive tire pressure monitoring system according to claim 1, wherein the air pressure sensor is installed inside the receiver.