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Method and device for monitoring an actuator system

  • US 9,792,256 B2
  • Filed: 05/31/2013
  • Issued: 10/17/2017
  • Est. Priority Date: 06/04/2012
  • Status: Active Grant
First Claim
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1. A method for monitoring an actuator in a physical system, the method comprising:

  • monitoring, based on measured system quantities, the actuator, via a processor having a computer model that describes the actuator, the behavior of the actuator being represented by a computer model function and one or more parameters of the computer model function;

    determining or adapting values of the parameters of the computer model with the aid of one or more particular system quantities;

    determining an error when a specified error condition is fulfilled, the error condition defining when at least one of the parameters, and/or at least one quantity determined from a plurality of the parameters, lies outside a corresponding specified target deviation range for a relevant parameter or the relevant quantity; and

    determining that a component of the actuator is faulty if the error is determined;

    wherein the actuator includes an electromechanical throttle valve actuator for a throttle valve in an engine system having an internal combustion engine, the position of the throttle valve and/or an electric voltage applied to the electromechanical throttle valve actuator being specified as the system quantities, andwherein for the actuator, the error condition on the basis of which a particular error can be identified include at least one of the following error types;

    (i) an actuator spring is broken and/or missing, and/or a low resistance, and/or a short-circuit, and/or a weak motor, and/or defective permanent magnets;

    (ii) an actuator friction is too high due to contamination and/or stiffness;

    (iii) an actuator friction is too low due to wear, missing shaft sealant, and/or a broken coupling bar;

    (iv) an actuator component has a high resistance; and

    (v) the actuator component has a low resistance due to a short circuit, a weak motor, and/or defective permanent magnets, andwherein error types (i) correspond to the following error condition;


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    ),where R is a winding resistance of an actuator drive of the actuator, L is an inductance of a winding of the actuator drive, I represents an actuator current through the actuator drive, J represents a mass moment of inertia, and Cm and Kgear represent a gear ratio,

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