Method and switching arrangement for regulation of a two-dimensional vector of a segment by means of a value-discrete setting element with a limited switching frequency

Claim 1

A method for processing reference value vectors of a two-dimensional vector of a controlled system for switch signals for a discrete value final controlling element during a switching period, said controlling element outputting a current vector as a function of a plurality of discrete switch combinations, each of said switch combinations representing a discrete current actual-value vector, the method comprising: determining an inverter current reference indicator of said controlling element from the reference value vectors of said controlled system; selecting a vector triplet of discrete current actual-value vectors as a function of said current vector of said controlling element, said vector triplet defining and spanning a sector in which said inverter current reference indicator of said controlling element resides; computing three voltage gradients from said vector triplet, said reference value vectors of the two-dimensional vector of said controlled system, and an angular speed of a flux of said controlled system; determining a dwell time for each of said discrete current actual-value vectors in said vector triplet; determining a corner point of a reference trajectory of a reference value vector of the two-dimensional vector of said controlled system as a function of said voltage gradients and said dwell times for said discrete current actual-value vectors in said vector triplet; determining remaining time from one corner point to a next switching point as a function of said voltage gradient; converting said remaining time into a switch signal as a function of said sector defined by said vector triplet, said switch signal setting a discrete switch combination in said controlling element.

Claim 2

A method for processing reference value vectors of a two-dimensional vector of a controlled system for switch signals for a discrete value final controlling element during a switching period, said controlling element outputting a current vector as a function of a plurality of discrete switch combinations, each of said switch combinations representing a discrete current actual-value vector, the method comprising: determining an inverter current reference indicator of said controlling element from the reference value vectors of said controlled system; selecting a vector triplet of discrete current actual-value vectors as a function of said current vector of said controlling element, said vector triplet defining and spanning a sector in which said inverter current reference indicator of said controlling element resides; computing three voltage gradients from said vector triplet, said reference value vectors of the two-dimensional vector of said controlled system, and an angular speed of a flux of said controlled system; determining a dwell time for each of said discrete current actual-value vectors in said vector triplet; determining a corner point of a reference trajectory of a reference value vector of the two-dimensional vector of said controlled system as a function of said voltage gradients and said dwell times for said discrete current actual-value vectors in said vector triplet; determining remaining time from one corner point to a next switching point as a function of said voltage gradient; converting said remaining time into a switch signal as a function of said sector defined by said vector triplet, said switch signal setting a discrete switch combination in said controlling element.

Claim 19

An apparatus for regulating a two-dimensional vector of a controlled system comprising: a discrete value final controlling element having a limited switching frequency and generating a limited number of discrete switch combinations, such that each of said switch combinations represents a discrete actual-value vector; a microprocessor, which receives a periodically asserted interrupt signal, such that a variable reference-value vector and said two-dimensional vector of said controlled system are read into said microprocessor after said interrupt signal is received, said microprocessor determining three actual-value vectors being adjacent to said reference value vector; said discrete value final controlling element alternating, in a predetermined sequence and at predetermined interval times, between the generation of said three actual-value vectors in said discrete value setting element during a switching period along a reference trajectory, such that a switch from one actual-value vector to another actual-value vector takes place when a distance between said two-dimensional vector and a next corner point of said reference trajectory is at a minimum, and such that a mean value of said two-dimensional vector is generated, said mean value being equal to said reference value; said microprocessor having a plurality of outputs and supplying to a first output a value equal to an amount of time remaining before a next corner point is reached and supplying to a second output a value equal to a vector number of a next actual-value vector.

Claim 20

An apparatus for regulating a two-dimensional vector of a controlled system comprising: a discrete value final controlling element having a limited switching frequency and generating a limited number of discrete switch combinations, such that each of said switch combinations represents a discrete actual-value vector; a microprocessor, which receives a periodically asserted interrupt signal, such that a variable reference-value vector and said two-dimensional vector of said controlled system are read into said microprocessor after said interrupt signal is received, said microprocessor determining three actual-value vectors being adjacent to said reference value vector; said discrete value final controlling element alternating, in a predetermined sequence and at predetermined interval times, between the generation of said three actual-value vectors in said discrete value setting element during a switching period along a reference trajectory, such that a switch from one actual-value vector to another actual-value vector takes place when a distance between said two-dimensional vector and a next corner point of said reference trajectory is at a minimum, and such that a mean value of said two-dimensional vector is generated, said mean value being equal to said reference value; said microprocessor having a plurality of outputs and supplying to a first output a value equal to an amount of time remaining before a next corner point is reached and supplying to a second output a value equal to a vector number of a next actual-value vector.