RU1811597C - Device for checking pressure in tyres of vehicles - Google Patents

Abstract

The invention relates to instrumentation, in particular to transport electronics, and can be used on automobiles and trolleybuses for monitoring tire pressure. Purpose: increasing the reliability of the control due to its independence from the position and speed of rotation of the wheel. Summary of the invention: the device comprises an electric contact pressure sensor 1 and a first inductor 5 mounted on the movable part of the wheel and electrically connected to each other, as well as a second inductor 9 mounted on the stationary part of the wheel and inductively coupled to the first coil 5, and a signal device 17. The feature of the device is that it is equipped with a third inductor 13 mounted on the fixed part of the wheel, and the signal device 17 is made in the form of a transmit-receive his device. In this case, the second 9 and third 13 of the inductor are made in the form of, respectively, emitting and receiving magnetic heads connected to the receiving and transmitting device 17. Pressure sensor 1 is made with normally closed contacts. The device allows you to control the pressure in the tires both on the stand and in motion, which increases the safety of movement. 1 s.p. f-ly, 1 ill. to

Description

x |

CA)

The invention relates to instrumentation, in particular to vehicle electronics for monitoring the pressure in vehicle tires, for example, tires of cars, trucks, and trolley buses.

The purpose of the invention is to increase the reliability of the control due to its independence from the position and speed of rotation of the wheel.

This is achieved by the fact that in a device for monitoring tire pressure of a vehicle comprising an electrical contact sensor, a first inductor mounted on the moving part of the wheel and electrically connected to each other, as well as a second inductor mounted on the fixed part of the wheel and inductively coupled to the first coil, and the signaling device, an additional third inductor is introduced, which is mounted on the fixed part of the wheel with a gap above the first inductor and is the receiving magnetic head of the transmitter / receiver unit.

The receiving and transmitting device emits a magnetic head irradiates the first inductor with an electromagnetic field, and the receiving magnetic head receives this field.

At normal pressure in the wheel, the contacts of the pressure sensor are closed and the magnetic field from the radiating magnetic head is transmitted to the receiving magnetic head.

When the pressure decreases, the pressure sensor contacts open and the transmitter-receiver device generates an alarm signal, which is sent to the indicating device.

In the vehicle tire pressure monitoring device, the first inductance coil is made in the form of a torus coaxially with the wheel and is therefore stationary and in motion it is located under the emitting and receiving magnetic heads, this makes it possible to control the pressure both on the parking position and in motion.

In the case of a rotating transformer, pressure control occurs once per revolution. When the coil is irradiated with a magnetic field with a frequency of 25 periods per second, information is received 25 times per second. This makes it possible to detect a decrease in pressure long before the wheel loses its elasticity and the tire is chewed. As for the pressure sensor contacts, they are connected in series with the inductor and closed at normal pressure.

An open of this circuit for any reason (pressure reduction, loss of contact in the circuit) causes an alarm to be sent to the indicating device, that is, if

malfunctions in the circuit also give an alarm signal to the indicating device, which leads to an increase in the reliability of the system.

The drawing shows a structural diagram of the location of the components of the device for monitoring the pressure in the tires of the vehicle.

The device consists of electrical contact pressure sensors 1-4 and inductors 5-8 mounted on a movable

5 parts of a wheel. Radiating magnetic heads 9-12, receiving magnetic heads 13-16 of receiving and transmitting devices 17-20 are mounted on the fixed part of the wheel. The signals from the transmitting and receiving devices are sent to the indicating device 21 and are reflected by single indicators 22-25 and the capsule of the telephone 26. The electrical contact pressure sensors 1-4 are connected in series with the coils

5 inductance 5-8. If there is a set pressure and in the tire, the contacts of the sensors 1-4 are closed, with a decrease or absence of pressure, they are open. Pressure sensors 1-4 and coils 5-8 are mounted on moving parts of the wheel: on the rear wheel is a wheel disk and brake disk, on the front wheel is a hub.

Emitting and receiving heads are mounted above coils 5-8 with a gap of 3-5

5 mm and are spaced relative to each other by a distance of 120 mm and do not affect one another.

Radiation of the magnetic field by the head occurs in one direction. From

0 of the radiating head, it enters the inductor and is received by the receiving head from the inductor, and not from the transmitting head.

The transmitting and receiving devices 175 20 located in a housing of 112x23x15 mm in size are irradiated with the help of radiating magnetic heads 9-12 by the electromagnetic field of the coil 5-8.

If the coils are closed by the contacts of pressure sensors 1-4, the receiving magnetic heads 13-16 receive a magnetic field. When one of the contacts opens, the receiving magnetic head does not accept a magnetic field, while

5, the receiving and transmitting device generates an alarm signal, one of the single indicators 22-25 lights up indicating which wheel is malfunctioning and an intermittent sound signal is turned on through the telephone capsule 26. The receiving and transmitting

devices and magnetic heads are mounted on fixed parts of a car wheel. The display device is installed in the vehicle interior on the dashboard in a convenient location.

The control device is powered from the vehicle electrical system with a voltage of 12 V with a minus on the body. The type of current is constant. Power consumption no more than 3.2 watts. Pressure sensor adjustment range 0.1 (1.0) - 0.25 (2.5) MPa (kg / cm2). Weight is not more than 0.7 kg. Sealing units allows you to operate the device in all weather conditions.

Using the device allows you to control the pressure in the tires both on the stand and in motion, increases the safety of movement, eliminates the possibility of driving on the wheel disc, i.e. chewing the tire.

The proposed vehicle tire pressure monitoring device can be implemented in cars, trucks and trolleybuses.

The device was manufactured and installed on a VAZ-2105 automobile and is currently in operation. There were no failures or malfunctions in the operation of the device.

Claims (2)

1. A device for monitoring tire pressure of a vehicle, comprising an electrical contact pressure sensor and a first inductor mounted on a movable part of the wheel and electrically connected to each other, as well as a second inductor mounted on a fixed part of the wheel and inductively coupled to the first coil and a signal device, characterized in that, in order to increase the reliability of the control due to its independence from the position and speed of rotation of the wheel, it is equipped with a third inductor the activity installed on the fixed part of the wheel, and the signal device is made in the form of a receiving and transmitting device, while the second and third inductors are made in the form of respectively radiating and receiving magnetic heads connected to the receiving and transmitting device. 2. The device according to claim 1, characterized in that it has an electric contact pressure sensor with normally closed contacts.