SU1705162A1 - Suspension system of vehicle multicushion running gear - Google Patents

Abstract

The invention relates to vehicles. The purpose of the invention is to improve the performance characteristics of prep-up + 1 by increasing the speed and ensuring that the natural frequency of the suspension is adjusted in a wide frequency range. A health diagnostics sensor 9 and a mechanical vibration sensor 11 connected to a functional converter 8 are inserted into the suspension system. Regulators 3 of each pneumatic spring 1 are independently connected to the control unit 13 of the functional converter 8, and the hydraulic damper 6 is used as the working fluid of the hydraulic damper and the hydraulic damper resistance 6 is controlled by electromagnetic control of the working fluid viscosity. 3 h. item f-ly, 1 ill.

Description

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FIELD OF THE INVENTION The invention relates to vehicles, in particular, to pneumatic suspension suspensions for vehicles.

The purpose of the invention is to improve the performance of the suspension by increasing the speed and ensuring the regulation of the natural frequency of the suspension in a wide frequency range.

The drawing shows a schematic diagram of the prepassembly of the suction system of a multi-support chassis of a vehicle.

The sub-sandstone system contains a w: епpg о springs 1 with operatic elements 2, regulating feeds 3. additional volumes 4, a source of 5 drops, a hydraulic system CKvedempfra 6 fluctuations with devices 7 changes in the viscosity of the working fluid, a functional converter 8,

Sensors 9 diagnose the health of pneumatic springs 1 and support elements 2 (for example, a force transducer), sensors 10 level of the vehicle platform height and sensors 11 mechanical oscillations of the suspension connected to the inputs of the electronic unit 12 comparing the functional converter 8.

A four-position electro-control valve 3 (for example, a charger) is placed in the line between the pneumatic valve 1, additional volume 4 and the pressure source 5, which is independently connected to the outputs of the electronic control unit 13 of the functional converter 8. In addition, the four-pin valve 3 also performs the functions of a shut-off and or quick exhaust air springs 1 about the atmosphere.

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A magnetorheological fluid, the viscosity of which is regulated by means of an electromagnetic device 7, which has been made about the screw type of the heart, is used as the working grade of the hydrodamper 6. ; cobbled inside solenoid.

An accelerometer is used as the mechanical vibration sensor 11, which also functions as a speed sensor.

The trans-yurt support system of the undercarriage works in a smooth operation.

The vehicle platform, when changing and moving the load, changing the speed of movement and terrain of the track, deviates from other external influences and their combinations from the horizontal position and from a given level of floor height. Any deviations from the predetermined position of the floor are monitored by the sensor 10 of the height of the vehicle platform, the electrical signals from which are fed to the input of the electronic unit

12 Comparisons of the Functional Converter 8. The signals of the sensors 9 on the operability of the pneumatic spring 1 and the supporting elements 2 and from the sensors 11 on the frequency of forced oscillations of the suspension and the speed of the vehicle move the other inputs of the electronic unit 12. Based on the continuous comparison in the functional converter 8 of the information coming from the sensors, the actual and predetermined positions of the vehicle platform, the electronic unit

The control unit 13 regulates the characteristics of the pneumatic spring 1 and hydraulic dampers 6. A microprocessor can be used as the electronic control unit 13.

To increase the rigidity of the pneumatic resistors 1, its cavity is connected via an electronically controlled valve 3 to the pressure source 5 via a command from the electronic control unit 13, and the platform height level rises, which the sensor 10 reports to the functional transducer 8. When the specified height is reached The platform of the pneumatic spring 1, at the command of the electronic unit 13, is disconnected by valve 3 from the source 5 of pressure.

To reduce the stiffness of the pneumatic spring, its cavity is connected to the additional volume 4 by means of the valve 3 with the help of valve 3 until the position of the platform corresponding to the specified one in the electronic unit 12 about MOUSM is connected.

In order to quickly lower the level of the vehicle platform, the cavity of the pneumatic suspension 1 is communicated with the atmosphere by the command of the electronic unit 13. In this case, valve 3 performs the function of a quick exhaust valve.

In this way, active feedback is performed; sensor 10, functional converter 8, electropneumatic valve 3, pneumatic spring 1, due to which the vehicle platform is constantly maintained in a close to nominal position in height and roll and in a parallel roadway.

In the event of a malfunction, any of

5 air springs 1 or support element 2, which the sensor 9 reports to the comparison unit 12 of the functional converter 8, the electronic control unit 13 of which is turned off using an electropneumatic valve

0 3 damaged support from the additional volume 4 with a source of 5 pressure and from the exhaust into the atmosphere. At the same time, the electronic control unit 13 switches to the appropriate version of the non-standard program for adjusting the suspension system of the vehicle chassis, which redistributes the functions of the damaged pneumatic spring to the adjacent ones.

0 In the stiffness control mode of the pneumatic spring, to align the position of the vehicle platform, the suspension system of the chassis undergoes forced oscillations. To reduce 5 amplitude of oscillations, oscillation dampers are used, for example hydraulic dampers containing a hydraulic choke with variable cross section.

0 In the proposed suspension system, it is not necessary to change the flow area in the throttle channel to regulate the resistance of the hydraulic damper.

The device of electromagnetic control of resistance, by changing the viscosity of the working fluid, the hydraulic damper in the proposed suspension system works as follows. According to the signals from the sensor 11 of the mechanical oscillations of the suspension, in accordance with the program incorporated in the functional converter 8, the resistance of the hydraulic damper b is controlled by the command of the electronic control unit 13 by changing the voltage on the solenoid winding. In this case, the magnetic field strength changes in the channel of the throttle device, formed by the core auger blades and the throttle body, and. As a result of the magnetorheological effect, the viscosity of the magnetor is changing; the logical efficiency passes through the choke. The change of the working tol hydraulic damper; For a corresponding change in the hydraulic resistance of the throttle.

At a certain intensity, the magnetic field can achieve almost zero flow through the choke due to the formation in its hedgehod of oriented structures of ferromagnetic particles, which need to be destroyed by removing the magnetic field.

When the winding of the throttle device is connected to the power supply circuit, a magnetic field is formed that is oriented along the axis of the screw auger. At the same time, due to the movement of the ferromagnetic suspension along the spiral channel of the throttles, it is subjected to a transverse magnetic flux, as a result of which its effective viscosity increases sharply.

The direct effect of the electromagnetic field in the choke on the working magnetoS 0 / jugic fluid improves the speed and simplifies the process of controlling the hydraulic damper 6, eliminating the resonant oscillations of the sub sand.

A mechanical vibration oscillation sensor 11 provides information on the frequency and amplitude of oscillations to the electronic unit 12 comparing the functional converter 8, the memories of which contain the values of the natural and resonant frequencies of the oscillations of the suspension. When the forced frequencies of the suspension oscillate approach the critical values, the electronic control unit 13 provides the appropriate command to change the voltage in the winding of the electromagnetic damper resistance control device b.

As a result of an almost instantaneous change in viscosity of the working fluid and. consequently, the resistance of the hydrodamper 6, the amplitude of oscillation decreases, the frequency of natural oscillations of the suspension changes and, thus, resonant oscillations are excluded.

The suspension system of a multi-support vehicle undercarriage and a method for adjusting its characteristics are most efficiently applied in multi-support vehicles with magnetic ligation, where at high speeds the speed increases significantly.

requirements for speed and reliability of automatic control of suspension characteristics.

Claims (3)

1. Suspension system of a multi-support chassis part of the vehicle, containing pneumatic springs with additional volumes and pressure sources, hydraulic vibration dampers, devices for adjusting the rigidity of the pneumatic spring and resistance of hydraulic dampers, sensors of the vehicle speed and height level of the vehicle platform, functional Converter, in order to improve the performance of the suspension by increasing speed and providing control of the frequency of natural oscillations of the suspension, it is equipped with sensors for diagnosing the efficiency of the pneumatic spring and the supporting elements and sensors for mechanical oscillations of the suspension, connected to the inputs of the electronic unit of the functional converter, to the outputs of the electronic control unit which are connected autonomously stiffness control devices pneumores litter placed in the highway between pneumatic springs, additional volumes, quick exhaust valves and a source of pressure and electromagnetic damper resistance control devices. 2. System pop. 1, characterized in that, as a sensor for diagnosing the health of the pneumatic springs and the supporting elements, a force sensor is used disposed between the control spring and the vehicle platform. , 3. The system of claim 1, wherein an accelerometer is used as a sensor for mechanical vibration of the suspension, mounted on the vehicle platform and at the same time performing the function of a motion speed sensor. 4, System pop. 1, characterized in that as a working fluid of the hydraulic damper, an rhinoperological liquid is used, and the throttle of the electromagnetic damper control device of the hydraulic damper is made in the form of a core screw placed inside solenoid.