CN107678419A - Intelligent VGT actuator active response diagnostic method - Google Patents

Intelligent VGT actuator active response diagnostic method Download PDF

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Publication number
CN107678419A
CN107678419A CN201710888344.4A CN201710888344A CN107678419A CN 107678419 A CN107678419 A CN 107678419A CN 201710888344 A CN201710888344 A CN 201710888344A CN 107678419 A CN107678419 A CN 107678419A
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China
Prior art keywords
mrow
vgt
intelligent
vgt actuator
actuator
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CN201710888344.4A
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CN107678419B (en
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陈铁
任灵童
吕颖
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FAW Group Corp
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FAW Group Corp
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods

Abstract

The invention discloses a kind of intelligent VGT actuator active response diagnostic method.The intelligent VGT actuator active response diagnostic method of the present embodiment, first by EGR valve, engine operating condition, the judgement of the state of external environment condition and associated actuator, exclude other interference in diagnostic function closed loop space be present, influence the judgement of diagnostic function, pumping signal is launched to VGT actuator by ECU, VGT actuator upon receipt of the signals can Normal Feedback relevant control value, ECU receive correlation feedback signal after the amplitude of reception signal is calculated according to Fourier transform.The value being calculated carries out the confirmation and output of failure compared with intrinsic threshold value.

Description

Intelligent VGT actuator active response diagnostic method
Technical field
The invention belongs to car engine electronic control field, is that one kind is based on Fourier transform, is held by Active spurring Row device, the effect for judging to produce resonance diagnose the diagnostic method of actuator response.
Background technology
With in world wide environmental consciousness it is constantly improve, vehicle Abgasgesetz is increasingly strict.China is big Scope starts to carry out the Abgasgesetz of state IV, starts to carry out the Abgasgesetz of state V in developed regions such as Beijing, Shanghai.Following the year two thousand twenty Left and right will carry out the Abgasgesetz of state VI.The response performance of actuator to influenceing discharge is proposed to be distinctly claimed, it is necessary to right by regulation The failures such as actuator clamping stagnation, carbon distribution judge.
In the engine block of new generation for meeting the Abgasgesetz of state VI, VGT (variable cross section product turbocharger) will be into Configured for engine standard.Coordinate the actuator such as EGR (waste gas recycling) and choke valve in air-channel system to carry out coupling control, change Burning, control row temperature, the optimization discharge of kind diesel engine.After VGT actuator response performance declines, the management strategy of gas circuit will be by To significant negative effect, ultimately result in burning and deteriorate, emission is exceeded.
Traditional actuator response diagnosis, after conditions for diagnostics is met, using current gas flow and under this operating mode The thresholding flow value of demarcation is compared to be judged.This method needs to carry out the staking-out work of mass data, and can It can not ensure by property and accuracy.Easily produce erroneous judgement.
The content of the invention
The present invention seeks to the difficulty diagnosed for conventional actuators response, proposes a kind of intelligent VGT actuator actively Response diagnostic method, it is based on Fourier transform, formant waveform is produced by Active spurring actuator, by comparing waveform Attenuation degree judges actuator response character state.
The present invention solves technical problem and adopted the following technical scheme that：A kind of intelligent VGT actuator active response diagnosis side Method, it includes：
S10, according to initialization system flow change with setting threshold value comparative result judge whether EGR valve reaches access Working condition；
S20, engine temperature, environment temperature, EGR valve position, throttle valve position and pressurization control pattern all meet to run Condition；
S30, calculate Diagnostic Time t and diagnosis successful cycles number；
S40, the sinusoidal signal by ECU to VGT actuator transmitting sin (2 π tf), wherein f is tranmitting frequency；
S50, the feedback signal r by ECU reception VGT actuators.
S60, according to single order Fourier's series function s (t)=acos (2 π tf)+bsin (2 π tf) it is changed to obtain：
Pass through formulaSystem amplitude ω corresponding to calculating；
S70, the width with above-mentioned calculating after necessary amendment is carried out by atmospheric pressure and environment temperature to magnitude threshold value Value ω is compared, and VGT has response failure if calculating amplitude and being less than threshold value, diagnoses successfully once.
The present invention has the advantages that：The intelligent VGT actuator active response diagnostic method of the present invention is logical first Cross to EGR valve, engine operating condition, the judgement of the state of external environment condition and associated actuator, exclude in diagnostic function closed loop space Disturbed in the presence of others, influence the judgement of diagnostic function, launch pumping signal by ECU exists to VGT actuator, VGT actuator Understand Normal Feedback relevant control value after receiving signal, ECU is docked after receiving the feedback signal of correlation according to Fourier transform The amplitude of the collection of letters number is calculated.The value being calculated carries out the confirmation and output of failure compared with intrinsic threshold value.
Brief description of the drawings
Fig. 1 is the structural representation of the intelligent VGT responses fault diagnosis system of the present invention；
Fig. 2 is the flow chart of intelligent VGT actuator active response diagnostic method；
Mark is illustrated as in figure：1- engines；2-VGT actuators；3- choke valves；4-EGR valves.
Embodiment
Technical scheme is further elaborated with reference to embodiment and accompanying drawing.
Embodiment 1
A kind of intelligent VGT actuator active response diagnostic method is present embodiments provided, it includes：
S10, according to initialization system flow change with setting threshold value comparative result judge whether EGR valve reaches access Working condition.
The intelligent VGT actuator active response diagnostic method of the present embodiment is at work, it is necessary first to judges diagnosis work( The entry criteria of energy.Exclude the interference in the frequency that special operation condition or actuator action that may be present is brought to system.Make Diagnostic system is in a metastable working condition.Main interference source is EGR valve and engine in system.
In the present embodiment, under the control model of the low idling of engine processing, boost pressure, engine speed, speed, oil Door, clutch need to meet threshold value requirement, and moment of torsion is stable and meets that vibration requires.
S20, engine temperature, environment temperature, EGR valve position, throttle valve position and pressurization control pattern all meet to run Condition.
S30, calculate Diagnostic Time t and diagnosis successful cycles number.
S40, the sinusoidal signal by ECU to VGT actuator transmitting sin (2 π tf), wherein f is tranmitting frequency, approximation etc. In system frequency.
S50, the feedback signal r by ECU reception VGT actuators.
S60, according to single order Fourier's series function s (t)=acos (2 π tf)+bsin (2 π tf) it is changed to obtain：
Pass through formulaSystem amplitude ω corresponding to calculating.
By atmospheric pressure and environment temperature to the amplitude ω after the necessary amendment of magnitude threshold value progress with above-mentioned calculating It is compared, VGT has response failure if calculating amplitude and being less than threshold value, diagnoses successfully once.
The intelligent VGT actuator active response diagnostic method of the present embodiment, first by EGR valve, engine operating condition, The judgement of the state of external environment condition and associated actuator, exclude other interference in diagnostic function closed loop space be present, influence to examine The judgement of disconnected function, launching pumping signal by ECU upon receipt of the signals can Normal Feedback to VGT actuator, VGT actuator Relevant control value, ECU are calculated the amplitude of reception signal after receiving the feedback signal of correlation according to Fourier transform.Meter Obtained value carries out the confirmation and output of failure compared with intrinsic threshold value；It can be seen that the present embodiment need not be counted largely According to staking-out work, reliability and accuracy are higher.
The sequencing of above example only for ease of describing, does not represent the quality of embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims (1)

  1. A kind of 1. intelligent VGT actuator active response diagnostic method, it is characterised in that including：
    S10, according to initialization system flow change with setting threshold value comparative result judge whether EGR valve reaches access operating mode Condition；
    S20, engine temperature, environment temperature, EGR valve position, throttle valve position and pressurization control pattern all meet service condition；
    S30, calculate Diagnostic Time t and diagnosis successful cycles number；
    S40, the sinusoidal signal by ECU to VGT actuator transmitting sin (2 π tf), wherein f is tranmitting frequency；
    S50, the feedback signal r by ECU reception VGT actuators.
    S60, according to single order Fourier's series function s (t)=a cos (2 π tf)+b sin (2 π tf) it is changed to obtain：
    <mrow> <mi>a</mi> <mo>=</mo> <mfrac> <mn>2</mn> <mi>T</mi> </mfrac> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mi>T</mi> </msubsup> <mi>s</mi> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>t</mi> <mi>f</mi> </mrow> <mo>)</mo> </mrow> <mi>d</mi> <mi>t</mi> <mo>;</mo> </mrow>
    <mrow> <mi>b</mi> <mo>=</mo> <mfrac> <mn>2</mn> <mi>T</mi> </mfrac> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mi>T</mi> </msubsup> <mi>s</mi> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mo>(</mo> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>t</mi> <mi>f</mi> </mrow> <mo>)</mo> <mi>d</mi> <mi>t</mi> <mo>;</mo> </mrow>
    Pass through formulaSystem amplitude ω corresponding to calculating；
    S70, the amplitude ω with above-mentioned calculating after necessary amendment is carried out by atmospheric pressure and environment temperature to magnitude threshold value It is compared, VGT has response failure if calculating amplitude and being less than threshold value, diagnoses successfully once.
CN201710888344.4A 2017-09-27 2017-09-27 Intelligent VGT actuator active responsiveness diagnosis method Active CN107678419B (en)

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Publication number Priority date Publication date Assignee Title
CN109782742A (en) * 2019-01-31 2019-05-21 一汽解放汽车有限公司 A kind of actuator slow-response diagnostic method
CN112485010A (en) * 2020-11-30 2021-03-12 潍柴动力股份有限公司 Method and system for detecting response state of engine electric control actuator

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CN1632606A (en) * 2004-12-29 2005-06-29 重庆龙源科技产业发展有限公司 Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus
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CN102374002A (en) * 2010-08-13 2012-03-14 阿尔特(中国)汽车技术有限公司 Oxygen sensor diagnostic method
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CN1632606A (en) * 2004-12-29 2005-06-29 重庆龙源科技产业发展有限公司 Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus
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Publication number Priority date Publication date Assignee Title
CN109782742A (en) * 2019-01-31 2019-05-21 一汽解放汽车有限公司 A kind of actuator slow-response diagnostic method
CN109782742B (en) * 2019-01-31 2021-06-22 一汽解放汽车有限公司 Slow response diagnosis method for actuator
CN112485010A (en) * 2020-11-30 2021-03-12 潍柴动力股份有限公司 Method and system for detecting response state of engine electric control actuator

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