Transmission path compensator

Patent metadata

Field	Value
Publication number	US-9384725-B2
Application number	US-201213449204-A
Country	US
Kind code	B2
Filing date	Apr 17, 2012
Priority date	Apr 21, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

The invention relates to a system for generating anti-noise in an exhaust-gas line ( 9 ) of a vehicle, comprising a first electro acoustic transducer ( 11 ) for generating a first acoustic signal based on an electric control signal, and being in communication with the exhaust-gas line via an acoustic line ( 4, 7 ), with the first acoustic signal entering the exhaust line in form of anti-noise after having passed the acoustic line, a second electro acoustic transducer ( 13 ) for generating an electric measurement signal representing a second acoustic signal, and being in acoustic communication with the exhaust-gas line ( 9 ) at the anti-noise coupling region, a control unit ( 21 ) for generating the control signal based on the measurement signal, and a parameterizing unit ( 29 ) for determining a conforming phase parameter and a conforming magnitude parameter for the control function used by the control unit ( 21 ) based on the transient response of the control unit.

First claim

The invention claimed is:

1. A system for generating anti-noise in an exhaust-gas line of a vehicle, comprising:
a first electro acoustic transducer configured for generating a first acoustic signal based on an electric control signal, and being in communication with the exhaust-gas line via an acoustic line, with the first acoustic signal entering the exhaust line in form of anti-noise after having passed the acoustic line;
a second electro acoustic transducer configured for generating an electric measurement signal representing a second acoustic signal, and being in acoustic communication with the exhaust-gas line at the anti-noise coupling region;
a control unit configured for generating the control signal based on the measurement signal; and
parameterizing unit adapted for determining a conforming phase parameter and a conforming magnitude parameter for the control function used by the control unit based on the transient response of the control unit, wherein the parameterizing unit is configured for determining at least one of a temporal characteristic of the control signal and the measurement signal and wherein the parameterizing unit is configured to determine a transient time, an overshooting behaviour, and an instability of the operation for generating the control signal performed by the control unit from the temporal characteristics of at least one of the control signal and the measurement signal.

2. A system according to claim 1 , wherein the parameterizing unit is configured for reinitializing the control unit, and wherein re-initialization comprises an initiating of the generation of the control signal using at least one of a specific phase parameter and a magnitude parameter.

3. A system according to claim 1 , wherein the parameterizing unit is configured to determine two borderline phase parameters from the different phase parameters ranging from −π to +π used for re-initializing the control unit, with the borderline phase parameters yielding an unstable control operation in which the control signal exhibits an oscillating behavior, and enclosing an interval of phase parameters yielding a stable control operation in which the control signal exhibits less oscillation than during the unstable control operation.

4. A system according to claim 3 , wherein the conforming phase parameter is half the sum of the two borderline phase parameters.

5. A system for generating anti-noise in an exhaust-gas line of a vehicle, comprising:
a first electro acoustic transducer configured for generating a first acoustic signal based on an electric control signal, and being in communication with the exhaust-gas line via an acoustic line, with the first acoustic signal entering the exhaust line in form of anti-noise after having passed the acoustic line;
a second electro acoustic transducer configured for generating an electric measurement signal representing a second acoustic signal, and being in acoustic communication with the exhaust-gas line at the anti-noise coupling region;
a control unit configured for generating the control signal based on the measurement signal; and a parameterizing unit adapted for determining a conforming phase parameter and a conforming magnitude parameter for the control function used by the control unit based on the transient response of the control unit, wherein the parameterizing unit is configured to carry out the determination of the confirming magnitude parameters after a determination of the conforming phase parameters, and wherein the parameterizing unit is configured to determine a plurality of transient times, each transient time of the plurality of transient times determined at a re-initialization of the control unit, and to determine the conforming magnitude parameter as the magnitude parameter associated with the smallest resulting transient time of the plurality of transient times.

6. A system according to claim 5 , wherein the different magnitude parameters are determined by multiplying the magnitude parameter used prior to a re-initialization by a factor having a value greater than zero.

7. A method for determining a conforming phase parameter and a conforming magnitude parameter for a system for generating anti-noise in an exhaust-gas line of a vehicle according to claim 1 , comprising the following steps:
a) Initializing the generation of a control signal by the control unit using a phase parameter ranging from −π to +π,
b) Determining the amplitude characteristics of the control signal,
c) Analysing if the amplitude values of the amplitude characteristics show an oscillation behaviour,
d) Storing the phase parameters with a tag, the tag indicating if there is evidence for an oscillation behaviour or not,
e) Surveying the phase parameters stored with a tag for the presence of two phase parameters having a tag indicating an oscillation behaviour and enclosing only phase parameters having tags indicating no oscillation behaviour,
f) In the event of the survey in step e) yielding a negative result: continuing the method at step a) with the proviso that a phase parameter is used in step b) that is different from previously used phase parameters,
g) Determining the conforming phase parameter to be half the sum of the two phase parameters identified in step e) in the event of the survey of step e) yielding a positive result,
h) Resetting the control unit into an initial state,
i) Initializing the generation of a control signal by the control unit using a magnitude parameter differing from the magnitude parameter used in steps a) to g) by a positive factor,
j) Determining the amplitude characteristics of the control signal,
k) Analyzing the amplitude characteristics for transient overshoots,
l) Continuing the method at step h) with the proviso that a greater magnitude parameter is used in step i) when an overshoot is determined in step k), and determining the transient time from the amplitude characteristics when no overshoot is determined in step k),
m) Checking if the transient time is smaller than a predetermined threshold value,
n) Continuing the method at step h) with the proviso that smaller magnitude parameter is used in step i), when the check of step m) results a transient time greater or equal than the predetermined threshold value, and
o) Determining the magnitude parameter used last as the conforming magnitude parameter, when the check of step m) results a transient time smaller than the predetermined threshold value.

8. A method according to claim 7 , wherein the threshold value is a predetermined value or the smallest transient time determined previously.

9. A method according to claim 7 , further comprising a step for resetting the control unit into an initial state, which is performed prior to step a).

10. A method according to claim 7 , wherein it is further analysed in step c), if the maximum value of an amplitude oscillation period is greater than the maximum value of a previous amplitude oscillation period.

11. A motor vehicle with an internal-combustion engine and a system according to claim 1 for generating anti-noise in an exhaust-gas line of the engine.

12. A system according to claim 2 , wherein re-initialization further comprises a prior resetting of the control unit into an initial state.

Assignees

• Luecking Christof
• Pietrzyba Sebastian
• Eberspaecher Exhaust Tech Gmbh

Inventors

• Luecking Christof
• Pietrzyba Sebastian

Classifications

• G10K2210/12822

  Exhaust pipes or mufflers · CPC title

• G10K2210/503

  Diagnostics; Stability; Alarms; Failsafe · CPC title

• G10K11/1782 Primary

  Physics · mapped topic

• F01N9/00 Primary

  Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title

• G10K11/17857

  Geometric disposition, e.g. placement of microphones · CPC title