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Control process and apparatus, in particular lambda control

  • US 5,079,691 A
  • Filed: 01/16/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 05/14/1988
  • Status: Expired due to Fees
First Claim
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1. A method for precontrolling and controlling a controlled variable of a controlled system, in which at least one influencing variable is measured and, depending on the measuring result, a value of a precontrolled variable is supplied for precontrolling a manipulated variable, which was determined i advance in a calibration process under given conditions such that the effect of the influencing variable was compensated to a given extent, that is a given control-manipulated value occurred, preferably the control-manipulated value associated wit the system deviation 0, the method comprising the steps of:

  • subdividing the influencing variable according to value into influencing variable classes;

    subdividing a variable dependent on the control-manipulated variable according to value into control-manipulated variable classes;

    repeatedly determining in which control-manipulated variable class the control-manipulated value happens to lie and in which influencing variable class the value of the influencing variable happens to lie;

    incrementing a counter in a cell which is part of a counter array, the cells of which can be addressed by numbers of the two classes;

    after occurrence of an evaluation condition, evaluating the counter array to the effect that the distribution over the control-manipulated variable classes is established for each influencing variable class;

    whenever the distribution concentrations for different influencing variable classes lie in different control-manipulated variable classes, computing a correction value for the particular influencing variable class; and

    ,during operation of the controlled system, influencing the manipulated variables by the associated correction value, account being taken of the relevant influencing variable class, the correction values being determined by the evaluation such that the distribution concentrations should lie in the same control-manipulated variable class for all the influencing variable classes.

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