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Method and control arrangement for controlling a controlled system with a repeating working cycle

A technology of duty cycle, control device, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem that delay can no longer be ignored

Active Publication Date: 2013-06-05
AVL LIST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At higher frequencies the system delay can no longer be ignored and enables rapid nominal torque changes on the test bench to be adjusted only with a time delay

Method used

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  • Method and control arrangement for controlling a controlled system with a repeating working cycle
  • Method and control arrangement for controlling a controlled system with a repeating working cycle
  • Method and control arrangement for controlling a controlled system with a repeating working cycle

Examples

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Embodiment Construction

[0016] figure 1 shows a simple control schematic diagram with a control object G to be controlled and a controller R, where as figure 2 As shown, the test bench arrangement has a test object 1 (such as an internal combustion engine, a drive train, etc.) and a load machine 2 (such as an electric motor), which are connected via a drive shaft 3 . In a known manner, the controlled object G is a control-technical model of the device to be controlled, here a test bench device, and the controller R controls a specific control parameter r of the controlled object G, here for example a shaft torque or a rotational speed. Predetermined setpoint value r for control soll and acquire (e.g. measure) the actual value r ist , this actual value is fed back into the feedback loop and subtracted from the setpoint in a known manner.

[0017] However, since measurement and processing always use the current actual value r with a delay ist_akt . In addition, time delays are introduced through...

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PUM

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Abstract

When arrangements with a repeating working cycle such as, for example, in the case of engine test benches, are being controlled, resonances which have to be damped by the control system are often excited by the test specimen (for example an internal combustion engine) in the working range of the arrangement. The invention proposes for this purpose a control concept in which a modified actual value rist—mod is determined from a current actual value rist—akt of the control system and from a predicted imminent system-delay-free actual value on the basis of the actual value of a previous working cycle, and said modified actual value rist—mod is fed to the control system.

Description

technical field [0001] The invention relates to a method and a control device for controlling a test bench arrangement comprising a test piece with a repeating work cycle and a load mechanism connected to the test piece by a drive shaft. Background technique [0002] On a test stand - such as an engine or drive train test stand - the test piece - such as an internal combustion engine, vehicle transmission, drive train, etc. - is connected to a load machine (dynamometer) - usually an electric motor - The desired load moment is applied to the component, where the load mechanism is often also used as the drive. A conventional drive shaft is generally chosen such that the natural frequency of the test rig structure is lower than the no-load revolution, for example 17 Hz compared to the no-load frequency of a four-cylinder engine of about 20 Hz. This avoids resonances in the operating range of the test piece, but this limits the magnitude of the load or drive torque, since the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/048
Inventor H·科卡尔J·迈尔霍费尔D·登格M·施密特L·德尔瑞
Owner AVL LIST GMBH