Method And Test Bench For Carrying Out A Test Run For A Test Specimen
US-2019011329-A1 · Jan 10, 2019 · US
Method for controlling a load machine during a test run with a drive train and test stand
US10962445B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10962445-B2 |
| Application number | US-201716466986-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 5, 2017 |
| Priority date | Dec 5, 2016 |
| Publication date | Mar 30, 2021 |
| Grant date | Mar 30, 2021 |
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- Title
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Abstract
Official abstract text for this publication.
The present teaching includes a speed control of a side shaft of a drive train connected to a dynamometer on a drive train test stand in which a torque (MFxi) caused by the longitudinal force (FXi) calculated in a simulation model is additionally transferred to the control unit, and from this a compensation torque (MKi) is calculated in the control unit as a function of the longitudinal force (FXi) caused by the torque (MFxi) and a deviation (AJi) between a moment of inertia (JBi) of the dynamometer and a moment of inertia (JRi) of the simulated vehicle wheel, the control unit calculates a torque (MREi,) from the setpoint speed (nBi,set) with a speed controller and a torque (MBi,soll) to be set with the dynamometer is calculated as the sum of the compensation torque (MKi) and the torque (MREi) calculated by the speed controller and set by the dynamometer.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for carrying out a test run on a drive train test stand on which a drive train with at least one side shaft is arranged and this side shaft is connected to a dynamometer and the speed of the side shaft is regulated in a control unit, wherein in a simulation model a longitudinal force of a tire of a vehicle wheel, represented as F Xi , is simulated with the simulation model, and a setpoint speed of the dynamometer to be set is calculated, and the setpoint speed is transferred to the control unit as a setpoint value of the speed control of the dynamometer, characterized in that a torque caused by the longitudinal force, represented by M Fxi , is calculated in the simulation model and is also transferred to the control unit, and therefrom a compensation torque, represented by M Ki , is calculated in the control unit as a function of the torque caused by the longitudinal force and a deviation between a moment of inertia of the dynamometer, represented by J Bi , and a moment of inertia of the simulated vehicle wheel, represented by J Ri , that the compensation torque is calculated from the relationship: M Ki = J Bi J Ri M Fxi + M Ri - J Bi J Ri M Bi or M Ki = J Bi J Ri M Fxi + ( 1 - J Bi J Ri ) M Ri , with a torque acting on the side shaft, represented by M Ri and a torque acting on the shaft of the dynamometer, represented by M Bi , or M Ki =M Fxi +J Ri {dot over (ω)} Ri −J Bi {dot over (ω)} Bi or M Ki =M Fxi +( J Ri −J Bi ){dot over (ω)} Ri , with an angular acceleration acting on the side shaft, represented by {dot over (ω)} Ri , and an angular acceleration acting on the shaft of the dynamometer, represented by {dot over (ω)} Bi , that the control unit calculates a control torque set with the dynamometer is calculated as the sum of the compensation torque and the control torque. 2. The method of claim 1 , characterized in that the simulation model includes a wheel model having a tire model and a vehicle model, wherein the vehicle model calculates a longitudinal velocity the simulated vehicle and a vertical force of the vehicle wheel and transfers them to the wheel model and the wheel model having the tire model calculates the longitudinal force and transfers it to the vehicle model. 3. The method of claim 1 , wherein the compensation torque is calculated using a rolling resistance torque of the tire of the vehicle wheel. 4. A drive train test stand with a drive train of a vehicle as a test specimen, wherein the drive train on the drive train test stand is subjected to a test run, wherein at least one side shaft of the drive train is connected with a dynamometer and a control unit is provided to control the speed of the side shaft in accordance with the specifications of the test run, and wherein a simulation model for simulating a vehicle wheel of the vehicle is implemented on the drive train test stand that calculates a longitudinal force of the tire of the vehicle wheel, represented as F Xi , and a setpoint speed of the dynamometer to be set, characterized in that in the control unit a compensation unit is provided that calculates a compensation torque, represented by M Ki , from a torque caused by the longitudinal force, represented by M Fxi , and a deviation between a moment of inertia of the dynamometer, represented by J Bi , and a moment of inertia of the simulated vehicle wheel, represented by J Ri , that the compensation torque is calculated from the relationship: M Ki = J Bi J Ri M Fxi + M Ri - J Bi J Ri M Bi or M Ki = J Bi J Ri M Fxi + (
Assignees
Inventors
Classifications
- G01M13/025Primary
Test-benches with rotational drive means and loading means; Load or drive simulation · CPC title
- G01M17/007Primary
Wheeled or endless-tracked vehicles (G01M17/08 takes precedence) · CPC title
the wheels of the vehicle co-operating with rotatable rolls (G01M17/022, G01M17/045, G01M17/065 take precedence) · CPC title
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Frequently asked questions
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- What does patent US10962445B2 cover?
- The present teaching includes a speed control of a side shaft of a drive train connected to a dynamometer on a drive train test stand in which a torque (MFxi) caused by the longitudinal force (FXi) calculated in a simulation model is additionally transferred to the control unit, and from this a compensation torque (MKi) is calculated in the control unit as a function of the longitudinal force (…
- Who is the assignee on this patent?
- Avl List Gmbh
- What technology area does this patent fall under?
- Primary CPC classification G01M13/025. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 30 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).