CN105480031B - Displacement magnetic screen formula tire pneumatic pressure detector - Google Patents

Abstract

The title of the present invention is the displacement magnetic shielding type tire air pressure detection device. The invention belongs to the technical field of tire pressure detection. It mainly solves the problems of complex circuit structure and frequent replacement of batteries in the existing tire air pressure detection system. Its main features are: the air path is a metal tube made of aluminum alloy with one end closed and one end open, and the open end is connected to the tire air pipe; the silicon steel sheet is connected and fixed with the expansion film, and the expansion film is connected and fixed on the inner wall of the air path; the permanent magnet is connected It is fixed on the inner wall of the gas path near the closed end, and is magnetically matched with the silicon steel sheet; the air pressure detection control circuit includes a magnetic sensor circuit, a signal conditioning circuit, a comparator circuit, a system control circuit and an alarm circuit, and the magnetic sensor of the magnetic sensor circuit Mounted on the brake hub. The invention has the characteristics of no need to install a power supply in the tire, simple circuit and convenient installation, and is mainly used for real-time on-line detection of vehicle tire air pressure.

Description

Displacement magnetic shield type tire pressure detection device

technical field

The invention belongs to the technical field of tire pressure detection, and relates to a displacement magnetic shield type tire pressure detection device, in particular to a real-time on-line tire pressure detection device for vehicles.

Background technique

During the running of the vehicle, too low or too high tire pressure will affect the safety of the vehicle, so it is necessary to develop an online real-time tire pressure detection system. The existing tire pressure detection system adopts the wireless transceiver type, and its disadvantage is that the circuit structure is complicated, and the battery needs to be replaced frequently.

Contents of the invention

The object of the present invention is to provide a real-time on-line tire pressure detection device, which uses a magnetic sensor circuit and a permanent magnet for detection. The tire air pressure detection device does not need to install a power supply in the tire, has a simple circuit and is easy to install.

The technical solution of the present invention is: a displacement magnetic shielding type tire pressure detection device, which is characterized in that it includes a permanent magnet, a silicon steel sheet, an expansion film, an air circuit and an air pressure detection control circuit; the air circuit is made of aluminum alloy with one end closed The open end of the metal tube made of aluminum alloy is connected to the tire air pipe; the silicon steel sheet is connected to the expansion film, and the expansion film is connected and fixed on the inner wall of the gas circuit; the permanent magnet is connected and fixed on the inner wall of the gas circuit near the closed end, and Magnetically cooperate with silicon steel sheet; air pressure detection control circuit includes magnetic sensor circuit, signal conditioning circuit, comparator circuit, system control circuit and alarm circuit, magnetic sensor circuit is connected with comparator circuit through signal conditioning circuit, comparator circuit and system The control circuit is connected, and the system control circuit is connected with the alarm circuit; the magnetic sensor of the magnetic sensor circuit is installed on the brake hub.

The present invention adopts the displacement magnetic shielding type tire pressure detection device which is composed of permanent magnet, silicon steel sheet, expansion film, gas path and air pressure detection control circuit. The open end of the tube is connected to the tire air pipe, the silicon steel sheet is connected and fixed with the expansion film, the expansion film is connected and fixed on the inner wall of the air circuit, the permanent magnet is connected and fixed on the inner wall of the air circuit near the closed end, and is magnetically matched with the silicon steel sheet, and the air pressure detection and control The circuit includes a magnetic sensor circuit, a signal conditioning circuit, a comparator circuit, a system control circuit and an alarm circuit. The magnetic sensor circuit is connected to the comparator circuit through the signal conditioning circuit, the comparator circuit is connected to the system control circuit, and the system control circuit is connected to the alarm circuit. The circuit is connected, and the magnetic sensor of the magnetic sensor circuit is installed on the brake hub. Therefore, when the tire pressure is at the standard pressure, too low or too high, the silicon steel sheet will be positioned at the permanent magnet magnetic field through the different expansion shapes of the expansion film. position, shield different parts of the magnetic field, the signal induced by the magnetic sensor circuit is compared in the comparator circuit after being conditioned by the signal conditioning circuit, and after comparison, a signal is output to the system control circuit, and the system control circuit sends a prohibition alarm signal to the alarm circuit. The vehicle continues to drive normally or activates the alarm signal to cause the alarm circuit to issue an alarm. The invention solves the problem in the prior art that batteries need to be installed in the tires, and has the characteristics of no need to install a power supply in the tires, simple circuit and convenient installation. The invention is mainly used for real-time on-line detection of vehicle tire air pressure.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: 1-expansion film, 2-silicon steel sheet, 3-permanent magnet, 4-magnetic sensor circuit, 5-comparator circuit, 6-system control circuit, 7-alarm circuit, 8-signal conditioning circuit, 9- Air circuit, 10-tire pressure.

detailed description

As shown in Figure 1. The displacement magnetic shield type tire air pressure detection device of the present invention comprises a permanent magnet 3, a silicon steel sheet 2, an expansion film 1, an air circuit 9 and an air pressure detection control circuit. Wherein, the air passage 9 is a metal tube made of aluminum alloy with one end closed and the other open. The open end of the aluminum alloy metal pipe is connected to the middle part of the tire air pipe, so that the air passage 9 is embedded in the inner side of the wheel axle and the magnet on the brake hub. The position corresponding to the sensitive sensor. The expansion membrane 1 is connected and fixed on the inner wall of the air passage 9, the expansion membrane 1 is a circular expansion membrane made of rubber, the periphery of the expansion membrane 1 is fixedly connected on the inner wall of the air passage 9, the diameter of the expansion membrane 1 is smaller than the inner diameter of the air passage 9, and the expansion membrane 1 It protrudes toward the closed end of the gas path 9 . The silicon steel sheet 2 is in the shape of a rectangular strip, one end of which is fixedly connected to the raised central position of the expansion film 1 by an adhesive, so that the silicon steel sheet 2 can be kept along its position during the deformation process of the expansion film 1. direction to move. The permanent magnet 3 is strip-shaped, connected and fixed on the inner wall of the gas path 9 near the closed end, and spaced from the silicon steel sheet 2, and the silicon steel sheet 2 stretches into the magnetic field of the permanent magnet 3. The air pressure detection control circuit includes a magnetic sensor circuit 4 , a signal conditioning circuit 8 , a comparator circuit 5 , a system control circuit 6 and an alarm circuit 7 . The magnetic sensor circuit 4 is connected to the comparator circuit 5 through the signal conditioning circuit 8 , the comparator circuit 5 is connected to the system control circuit 6 , and the system control circuit 6 is connected to the alarm circuit 7 . The magnetic sensor of magnetic sensor circuit 4 (such as the magnetic sensor of OH002 model) is installed on the brake hub, and the maximum distance between magnetic sensor and air circuit 9 rotating with the wheel is 50 millimeters. Each circuit in the magnetic sensor circuit 4, the signal conditioning circuit 8, the comparator circuit 5, the system control circuit 6 and the alarm circuit 7 is a conventional circuit, and the air pressure detection control circuit formed by the connection therebetween also belongs to a conventional circuit.

The working principle of the present invention is as follows: when the tire pressure is at the standard pressure, the expansion of the silicon steel sheet 2 through the expansion film 1 just blocks half of the silicon steel sheet 2, and the signal induced by the magnetic sensor circuit 4 is conditioned by the signal conditioning circuit 8 and then sent to the comparator. Compare in circuit 5, output a signal to system control circuit 6 after comparison, system control circuit 6 sends prohibition alarm signal to alarm circuit 7, and vehicle continues to run normally.

If the tire pressure is too high during driving, the silicon steel sheet 2 moves to the right, and the expansion of the expansion film 1 will block all the permanent magnets 3, and the signal induced by the magnetic sensor circuit 4 is the smallest, and the signal is conditioned by the signal conditioning circuit 8 Comparing in the comparator circuit 5, output a signal to the system control circuit 6 after comparison, the system control circuit 6 sends a starting alarm signal to the alarm circuit 7, and the alarm circuit 7 sends an alarm.

If the tire pressure is too low during driving, the expansion of the expansion film 1 is small, the silicon steel sheet 2 moves to the left, and the permanent magnet 3 is not blocked at all by the contraction of the expansion film 1, and the signal induced by the magnetic sensor circuit 4 is the largest , the signal is compared in the comparator circuit 5 after signal conditioning circuit 8 conditioning, and a signal is output to the system control circuit 6 after comparison, and the system control circuit 6 sends a start alarm signal to the alarm circuit 7, and the alarm circuit 7 sends an alarm.

In this way, the on-line real-time detection of the tire air pressure is realized by using the permanent magnet 3, the silicon steel sheet 2 and the magnetic sensor circuit 4.

Claims (1)

1. A kind of 1. displacement magnetic screen formula tire pneumatic pressure detector, it is characterised in that：Including permanent magnet（3）, silicon steel sheet（2）、 Expanded film（1）, gas circuit（9）Control circuit is detected with air pressure；Gas circuit（9）For one end closing, the aluminum alloy material of another end opening Metal tube, the openend of the metal tube of aluminum alloy material is connected with tire tracheae；Silicon steel sheet（2）With expanded film（1）Phase fixed It is fixed, expanded film（1）It is fixedly connected in gas circuit（9）On inwall；Permanent magnet（3）It is fixedly connected in the gas circuit close to blind end（9） On inwall, and and silicon steel sheet（2）Magnetic coordinates；Air pressure detection control circuit includes magneto-dependent sensor circuit（4）, signal conditioning circuit （8）, comparator circuit（5）, system, control circuit（6）And warning circuit（7）, magneto-dependent sensor circuit（4）Pass through signal condition Circuit（8）With comparator circuit（5）Connection, comparator circuit（5）With system, control circuit（6）Connection, system, control circuit（6） With warning circuit（7）It is connected；Magneto-dependent sensor circuit（4）Magneto-dependent sensor be arranged on brake hubs on.