Method for monitoring technical condition of wheeled vehicles with plug-in all-wheel drive system on benches with running drums and device for implementing it

Abstract

FIELD: test benches.SUBSTANCE: method is based on installing a vehicle on the running drums of a test bench with its wheels, setting a diagnostic test mode by misaligning the running drums and the flywheel masses of the stand using special clutches, followed by acceleration using the vehicle's power unit of the inertial masses of the bench and the wheels of the vehicle installed on the running drums of the stand, measuring and analysing the angular velocity and the traction forces realized on the drive wheels of the vehicle. The device comprises two blocks with running drums and four flywheels, kinematically connected to each other by means of shafts, clutches and chain drives, tracking system rollers designed to measure the rotation speed of the wheels, as well as devices for measuring the traction force on the wheels of the vehicle, located on the drive shafts of the running drums. Additionally, it comprises a system for misaligning the running drums and the flywheel masses of the bench for the front and rear axles of the vehicle.EFFECT: expansion of diagnostic functionality, increased efficiency, information content, and timeliness of monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system.2 cl, 5 dwg

Description

[0001] The method relates to mechanical engineering, in particular to the technical diagnostics of wheeled vehicles with a plug-in all-wheel drive system. The method and the equipment implementing it are intended for the diagnostics and monitoring of the technical condition of plug-in all-wheel drive systems by setting a test mode by simulating the slippage of the drive axle of a wheeled vehicle, as well as measuring and analyzing the traction force and angular velocity on each wheel of the wheeled vehicle.

[0002] There are methods for monitoring the technical condition of wheeled vehicles and test bench equipment for implementing these methods.

[0003] A method and associated equipment for monitoring the technical condition of wheeled vehicles are known. It is marketed by the American company MTS using Flat-Trac Dynamometer Roadway equipment (https: / / www.mts.com / en / products / automotive / full-vehicle-test-systems / flat-trac-dynamometer). Common features include setting test modes and measuring traction force on vehicle wheels. The disadvantages of this equipment include its massive and metal-intensive design, large dimensions, and very high cost, making its widespread use in field conditions impossible.

[0004] The DYNOMAX 4000 AWD "Dynamic Inertial Load Rig" from Dynomax Industrial (see the operating manual, "Dynomax Industrial" dynamic inertial load rigs (https: / / dynomax-dyno.com / dynomax-4000 / )) is used to monitor the traction and dynamic performance of wheeled vehicles with selectable all-wheel drive, and is considered an analogue. Similar features to the claimed device include the presence of running drums, inertial flyweights, and angular velocity sensors. Axle synchronization allows for full measurements of the traction and dynamic performance of wheeled vehicles with any drive type, including selectable all-wheel drive (e.g., Xdrive, Haldex).

[0005] The disadvantages of the analogue are: The design of the stand is made in the form of six running drums of the front axle and four running drums of the rear axle, which are kinematically rigidly connected to each other, which does not allow for monitoring the technical condition of the all-wheel drive connection system, since this requires kinematically misaligning the rotation of the wheels of the front and rear axles of the car.

[0006] A method and its associated equipment (Patent No. 2755626, IPC G01L 5 / 13, published December 30, 2020) are known. They are used as a prototype and are intended for monitoring the technical condition of a vehicle's dynamic directional stability control system using dynamometers. This device shares its design with the proposed device, namely, two dynamometer units with contactless traction force meters for each vehicle wheel, dynamometer speed sensors, wheel speed sensors, flywheel inertial masses, and an electrodynamic brake, which act as loading devices.

[0007] The disadvantages of the prototype include the lack of disconnecting clutches for misaligning the running drums, which limits the diagnostic functionality of the device, namely, it excludes the possibility of full diagnostics and monitoring of the technical condition of the all-wheel drive systems of wheeled vehicles.

[0008] The diagram of the device and its measuring systems, ensuring the implementation of the method for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system, is shown in Fig. 1, 2 and 3, where:

[0009] The diagram of the claimed device is shown in Figure 1, where:

[0010] 1 - decoupling clutch; 2 - flywheel mass; 3,8 - drum and roller speed sensors of the tracking system; 4 - chain drive; 5 - coupling clutch; 6 - non-contact force sensor; 7 - running drum; 9 - tracking system roller; 10 - support roller; 11 - strain gauge; 12 - eddy current electrodynamic brake; 13 - cardan transmission; 14 - gearbox; 15 - running drum shaft; 16 - running drum drive sprocket; 17 - decoupling clutch sprocket; 18 - pressure disk; 19 - driven disk; 20 - guide pin; 21 - threaded spring flange; 22 - spring; 23 - flywheel shaft;

[0011] The rig consists of two blocks, each block contains two pairs of running drums (positions 7 and 10), with tracking system rollers 9 located between the running drums. The kinematic connection between running drums 7 and 10 is provided by a chain drive. The torque from the pair of running drums 7 and 10 is transmitted to the non-contact force measuring sensor 6. Then to the coupling sleeve 5, and through the chain drive 4 to the disconnecting clutch 1. The torque from the disconnecting clutch 1 is transmitted to the flywheel 2. The left pair of running drums in one block is kinematically rigidly connected to the right pair by means of cardan transmissions 13 and gearboxes 14, providing a rigid kinematic connection between the front and rear blocks of the rig, while the power flow is transmitted through the electrodynamic brake 12.

[0012] The shaft of the running drum 15 is connected to the force sensor 6, which in turn is connected to the decoupling clutch 1 via the clutch 5, the sprocket 16 and the chain transmission 4. The rotating wheel of the vehicle rotates the running drum 7 and the sprocket 17 of the decoupling clutch. The decoupling clutch 1 consists of a set of driven disks 19 mounted on the flywheel drive shaft 23 using a splined connection, and a set of pressure disks 18 is mounted on the guide pins 20. The disks are pressed by springs 22, and the force from their pressing is adjusted by tightening the threaded flanges of the spring 21.

[0013] The design and operation of the decoupling clutch are similar to those of the clutch. It operates as follows: when sprocket 17 rotates, driven disks 19 mounted therein are pressed against disks 18 by springs 22. When the threaded flanges of springs 21 are retracted, pressure disks 22 move away from driven disk 18, and clutch 1 disengages. In this case, the mating parts of the clutch are kinematically disconnected from sprocket 17, and clutch 1 does not transmit torque to shaft 23, which allows for kinematic misalignment in the rotation of the front and rear blocks of the test stand's running drums, thereby initiating the operation of the automatic all-wheel drive system.

[0014] The test bench's measuring systems and a device (clutch) for setting the test mode ensure the measurement of controlled force and kinematic parameters for implementing a method for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system. It includes a device (clutch) for misaligning the flywheel masses from the running drums 1, speed sensors for the running drums 3, contactless force sensors 6, and speed sensors for the rollers of the tracking system 8. Clutch 1 is used to misalign the test bench's transmission to simulate slippage of the drive axle. Signals from the contactless force sensors 6 are fed to amplifiers, and signals from the speed sensors for the running drums 3 and the rollers of the tracking system 8 pass through converters. From the amplifiers and converters, the signal is transmitted for subsequent processing in an analog-to-digital converter - digital-to-analog converter (ADC-DAC), and from the ADC-DAC to a personal computer.In a personal computer, the software package processes signals and compares them with standard values.

[0015] The proposed method and the equipment implemented differ from the prototype in that it additionally contains a system for misaligning the running drums for the front and rear axles of the vehicle, which allows for expanding the diagnostic functionality, increasing the efficiency, information content, and speed of monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system.

[0016] The presence of a new set of essential features that are distinctive from the prototype in the claimed invention allows us to conclude that the claimed invention meets the criterion of “novelty”.

[0017] An additional comparative analysis of patent and scientific and technical information did not reveal any sources containing information about the familiarity of the set of distinctive features of the claimed invention, which indicates its compliance with the criterion of “inventive step”.

[0018] The technical result of the proposed method consists in obtaining more accurate measured data, namely, the analysis of the traction force and angular velocity on each wheel for vehicles with a plug-in all-wheel drive system by simulating the slippage of the drive axle.

[0019] The technical result is achieved by a method for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system on stands with running drums, based on installing the vehicle wheels on the running drums of a test stand, setting a diagnostic test mode by misaligning the front and rear axles of the stand, as well as accelerating the wheeled vehicle using the vehicle's power plant, the inertial masses of the stand and the vehicle wheels installed on the running drums of the stand, to a set speed, according to the method, characterized in that monitoring the technical condition of the plug-in all-wheel drive system of a wheeled vehicle is carried out by measuring the traction force and angular velocity on each wheel of the wheeled vehicle.

[0020] The technical result of the proposed device consists in expanding the diagnostic functionality, which consists in the ability to monitor the technical condition and control the technical condition of the all-wheel drive systems of wheeled vehicles by measuring power and speed parameters.

[0021] The technical result is achieved by a device containing blocks with running drums, four flywheels kinematically connected to each other by means of shafts, clutches and chain drives, rollers of a tracking system designed to measure the angular velocity of the wheels, as well as contactless sensors for measuring the traction force on the wheels of a vehicle located on the drive shafts of the running drums, the stand additionally contains a system for misalignment of the running drums for the front and rear axles of the vehicle, which allows to expand the diagnostic functionality, increase the efficiency, information content and speed of monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system.

[0022] The proposed method for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system on a test bench with rolling drums is implemented using the described device and consists of the following: the wheels of the wheeled vehicle being diagnosed are placed on the rolling drums of the diagnostic bench (the appearance of a wheeled vehicle with a plug-in all-wheel drive system HALDEX "VOLVO S60" on a full-support test bench is shown in Fig. 4); then the vehicle body is secured to the frame of the test bench with tension straps, preventing the body from moving relative to the frame of the test bench. After this, the rolling drums at positions 7 and 10 are accelerated by the vehicle wheels, and consequently, the flywheel masses at position 2 of the test bench, to a specified angular velocity. During the acceleration, the traction force on the vehicle wheels is measured by contactless sensors at position 6.The angular velocities of the running drums at positions 7 and 10 are measured by sensors at position 3, and the wheel speeds are measured by sensors of the tracking system rollers at position 8.

[0023] Experimentally obtained oscillograms of the process of operation of a wheeled vehicle with a system of plug-in all-wheel drive on the support rollers of a full-support stand up to a speed of 30 km / h with a misalignment of the front and rear axles are shown in Fig. 5. The graph under position a) (Fig. 5) shows the dependence of the average speeds of the driving wheels V 12 and V 34on time t during acceleration of WHEELED VEHICLES with a functioning clutch of the all-wheel drive system with simulated front axle slippage. Position (b) (Fig. 5) shows the dependence of the average traction forces of the drive wheels F on time t during acceleration of WHEELED VEHICLES with a functioning clutch of the all-wheel drive system with simulated front axle slippage. The presented oscillograms show the dependences of the torque of the drive wheels, vehicle speed, with the front axle disengaged. The obtained dependences allow for a quantitative evaluation of the all-wheel drive systems of wheeled vehicles.

[0024] The proposed method differs from the prototype in that, in the process of monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system, an analysis is made of the measurements of the parameters of the traction force realized on the wheels of the vehicle when setting the test mode (slipping of the drive axle), as well as the speed of the wheels, which makes it possible to use the proposed method and the equipment implemented therein for monitoring the technical condition and diagnosing wheeled vehicles with a plug-in all-wheel drive system under the operating conditions of WHEELED VEHICLES.

[0025] Tests confirming the correctness of the method and the functional capabilities of the device were carried out in the Research Laboratory for Monitoring the Technical Condition and Diagnostics of Vehicles at Irkutsk National Research Technical University.

Claims

1. A method for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system on stands with rolling drums, based on installing the vehicle on the rolling drums of a test stand, setting a diagnostic test mode by misaligning the rolling drums from the stand's transmission, followed by acceleration, using the power unit, of the stand's inertial masses and the vehicle's wheels mounted on the stand's support rollers, characterized in that monitoring the technical condition of wheeled vehicles is carried out by simulating the slippage of the drive axle, followed by measuring and analyzing the traction force and angular velocity on each wheel of the wheeled vehicle.

2. A device for monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system on stands with running drums, contains two blocks with running drums and four flywheels kinematically connected to each other by means of shafts, clutches and chain drives, rollers of tracking systems, the stand measures the speed of rotation of the wheels, and also takes readings from devices for measuring the traction force on the wheels of the vehicle, located on the drive shafts of the running drums, characterized in that it additionally contains a system for misalignment of the running drums for the front and rear axles of the vehicle, which allows for expansion of the diagnostic functionality, increase in the efficiency, information content and promptness of monitoring the technical condition of wheeled vehicles with a plug-in all-wheel drive system.

Images