DD221424A1 - REIFENFUELLEINRICHTUNG - Google Patents

Abstract

The invention relates to a tire filling device for fast automatic filling of vehicle tires with hose, in particular of large quantities, even with different dimensions or tire pressures. The invention aims to provide a rapid automatic filling of vehicle tires with hose using a high filling pressure, while at the same time an uncomplicated, easy and quick adaptation to different tire dimensions and tire pressure is achieved. The essence is to achieve the desired pressure in the vehicle tires by appropriate simulation of the tire pressure outside the vehicle tire with low technical and economic resources and effort. The invention should find application in the assembly of vehicle tires, especially in mass production. The drawing of Ausfuehrungsbeispieles shows the invention to a significant extent. figure

Description

Hoffmann, Christian, Dipl.-Ing

 Grid, Stefan, Dipl.-Ing.

Applicant: VEB Kraftfahrzeugwerk "Ernst Grube" Werdau

Operation of the Ii ¹ A Combination Passenger Car 9620 Werdau, Greizer Str. 70 - BfSR

Patent application

Title of Invention Tire Inflator

Field of application of the invention

The invention relates to a tire filling device for the rapid automatic pulling of vehicle tires with hose, in particular of large quantities, even with different dimensions and tire pressures.

Characteristic of the known technical solutions

There are known devices of the type mentioned, the control is done entirely by hand. All control functions realized by the operator of the device. Such devices have in addition to the manual handling nor the disadvantage that for pressure control measurements of the filling process must be interrupted v / ground. This means especially for larger series production

time loss and more work.

In other "known devices with automated compressed air filling process, electrical time stages take over the control function of the operator." Such devices still have time-consuming filling times and require significant changeover times at different tire sizes or tire pressures.

Furthermore, devices are known which, in combination with automatic tire mounting on the rim, subsequently also automatically fill the tire with compressed air. These facilities work with so-called filling bells. However, such devices are especially suitable for tubeless tires.

Zi e1.der inventions

The invention aims to provide a tire inflator for quickly automatically inflating vehicle tires with hose using a high inflation pressure while achieving uncomplicated, easy and quick adaptation to different tire dimensions and tire pressures.

Essence of the invention

The Y / esen of the invention is to achieve the SolldruGk in the vehicle tire by appropriate simulation of the tire pressure outside the vehicle tire with low technical and economic resources and effort.

Features of the invention

The features of the invention are that in the control part a continuous Meßwertbereitstellung securing low-pass filter and a comparator are provided. The low-pass filter is controlled by a pressure generator via a transmitter 'and the pressure of the vehicle tire also controlled by a transmitter.

The comparator evaluates the difference between simulated inflation pressure and the target value and transmits a control pulse to an actuator having a valve that regulates inflation pressure. The low-pass filter has a high time constant. He is followed by an operational amplifier. In the control part, an actuator is provided to accommodate different filling pressures and types of tires.

Embodiment . ,

The invention will be explained in more detail using an exemplary embodiment. The accompanying drawing shows

a schematic representation of the automatic tire. filling device in the form of a block diagram.

The embodiment according to the drawing shows the tire filling device essentially in its control devices without any particular representation of the mechanical transmission devices. According to the drawing, the tire filling device consists essentially of a pressure generator 1, from which a pressure is applied via a valve 2 of the vehicle tires 3. Output of the pressure generator 1 is a transmitter 4 and between the valve 2 and vehicle tires 3, a further transmitter 5 is arranged. Furthermore, the tire filling device includes a low-pass filter 6, a comparator 7 and an actuator 8. The comparator 7 is the input of the set value SY / and the actuator 8, the start ST and the ready message F assigned.

In the low-pass filter 6, the electronic replica of the tire filling takes place, the low-pass filter 6 having a necessary high time constant. Due to the necessary high time constant of the low-pass filter is very high, so that a voltage follower is followed by a suitable operational amplifier. For comparison of setpoint and actual value is a window discriminator usual circuit type. The consisting of low-pass filter 6 and comparator 7 circuit part also contains a suitable actuator, for. B. in the form of a selector switch to adapt to different filling pressures and tire types. For control, a stepper with three states and a conditional fiip-flop is useful for

Difference between filling and discharge process used, the realization is done with digital circuits with low or medium degrees of integration.

Mode of action: After the connection of the vehicle tire 3 to the tire filling device, the start ST takes place, whereby a filling cycle is first initiated. The valve 2 and the switching elements S1a and S1b are brought to the left switching position. After the appropriate simulated filling time has been completed, the output voltage of the low-pass filter β reaches the set value, the output voltage being proportional to the pressure in the vehicle tire. The STergleicher 7 transmits this to the actuator 8, after which a measuring cycle is initiated, the valve 2 and the switching elements S1a and S1b are brought into the middle position «Thus, the real filling pressure is passed from the vehicle tire 3 via the transmitter 5 to the low-pass filter and stored. The comparator 7 and the actuator. 3 determine whether the filling pressure is within the tolerance of the setpoint. If this is ensured, a ready message is sent via F. If this is not guaranteed, compressed air will be discharged or refilled depending on the instantaneous filling pressure, greater or smaller than the nominal value. The discharge of compressed air aus.dem filled vehicle tire 3 takes place in the position of the valve 2 and the switching elements S1a and S1b to the right according to a schematic representation. The convertibility to different tire dimensions via a control part associated actuator. When correcting the filling pressure is now assumed from the stored in the low-pass actual value.

The tire filling device has the decisive advantage that very high pressures can be used by the pressure generator 1 and therefore low tire filling times can be achieved in conjunction with the tire filling device.

Claims (2)

invention claims 1. Tire filling device for fast automatic pulling of vehicle tires with hose, especially of large. Quantities, even with different dimensions and tire pressures, characterized in that in the control part a continuous Meßwerfbereitstellung securing low-pass filter (6) and a comparator (7) are provided such that the low-pass filter (6) from a pressure generator (1) via a transmitter ( 4) and the pressure of the vehicle tire (3) via a transmitter (5) is controllable and evaluating the pressure differences between a simulated filling pressure or the actual in the vehicle tire (3) pressure and a predetermined setpoint a control pulse via a comparator (7 ) transmits the valve (2) operable actuator (8) and that the control part is assigned a filling pressure changing actuator. 2. Reifenfülleinrichtung according to item 1, characterized in that the low-pass filter (6) has a high time constant on v / e and it is followed by an operational amplifier. For this 1 sheet drawings