Method and device for creating computational models for nonlinear models of position encoders

A computational model and non-linear technology, applied in control/regulation systems, CAD numerical modeling, instruments, etc., can solve problems such as limited computing power

Inactive Publication Date: 2013-12-18
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Discretization often results in mathematically unsolvable systems of equations, which must therefore be solved iteratively, usually with high time overhead
This is generally unacceptable for real-time applications, since for example control devices for internal combustion engines have only limited computing power

Method used

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  • Method and device for creating computational models for nonlinear models of position encoders
  • Method and device for creating computational models for nonlinear models of position encoders
  • Method and device for creating computational models for nonlinear models of position encoders

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Embodiment Construction

[0038] figure 1 An adjusting system 1 for adjusting the position of an adjusting link 2 is shown. A method for creating a physical model that maps the regulating system 1 as precisely as possible and is suitable, for example, for a computational model that is suitable for use in control devices with limited computer capacity is described below with the aid of a throttle valve regulator that regulates The controller can adjust the throttle valve as the adjustment link 2. However, it is also possible to apply the method described below to other control systems whose physical properties can be described by non-linear difference equations.

[0039] The adjusting link 2 is moved by means of an adjusting drive 3 . The adjusting drive 3 can be designed as an electromagnetic actuator, which can be designed, for example, as a DC motor, an electronically commutated motor or a stepper motor. The position actually occupied by the adjusting element 2 can be detected and evaluated by mea...

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Abstract

A method is described for ascertaining a computational model for a position encoder system (1), in particular for a position encoder for controlling a gas mass flow rate for an internal combustion engine, having the following steps: providing a differential equation system with at least one nonlinear term; dividing (S1) the differential equation system to obtain a linear part which is describable by a linear differential equation and a nonlinear part which is describable by a nonlinear differential equation; discretizing (S2) the linear part of the differential equation system with the aid of a first discretization method to obtain a computational model for the discretized linear part; discretizing (S3) the nonlinear part of the differential equation system with the aid of a second discretization method to obtain a computational model for the discretized nonlinear part; combining (S5) the computational models of the discretized linear part and the discretized nonlinear part of the differential equation system to obtain the computational model for the position encoder system (1).

Description

technical field [0001] The invention relates to a method for creating a computational model of a physical system, in particular a regulator for controlling a gas mass flow in an engine system. Background technique [0002] For the design of regulators and regulators for regulating mechatronic actuator systems, such as throttle valves in internal combustion engines, and for their computer simulations, differential equation systems are usually created which map their physical properties. Although using simplified functions to map friction etc., the system of difference equations is non-linear. [0003] Furthermore, discontinuities, for example in non-linear spring characteristic curves of return springs etc. (i.e. return springs with regionally different characteristics), present a particular challenge only with greater difficulty in the underlying differential equations in the map. [0004] Furthermore, these equations must be discretized in time for calculation in order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/00
CPCG06F30/20G06F2111/10
Inventor A.瓦格纳R.比尔勒
Owner ROBERT BOSCH GMBH
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