CN113093705B - Excitation signal generation method and excitation signal generation system - Google Patents

Excitation signal generation method and excitation signal generation system Download PDF

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CN113093705B
CN113093705B CN202110362615.9A CN202110362615A CN113093705B CN 113093705 B CN113093705 B CN 113093705B CN 202110362615 A CN202110362615 A CN 202110362615A CN 113093705 B CN113093705 B CN 113093705B
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signal
tooth
missing
crankshaft
camshaft
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CN113093705A (en
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葛永琪
郑兴建
王博
刘心梦
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Ningxia University
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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
    • 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
    • G05B17/00—Systems involving the use of models or simulators of said systems
    • G05B17/02—Systems involving the use of models or simulators of said systems electric
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Abstract

The invention provides a method for generating an excitation signal, and belongs to the technical field of diesel engine EECU fault detection. The method comprises the following steps: loading signal characteristic parameters; storing the signal characteristic parameters into an EECU excitation signal configuration file; setting the frequency F and sampling rate F of the EECU excitation signal in the system program global variabless(ii) a Performing segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal; shifting the voltage of the generated EECU excitation signal upwards; and outputting the EECU excitation signal after voltage deviation through a channel of a data acquisition card. The invention also provides an excitation signal generation system.

Description

Excitation signal generation method and excitation signal generation system
Technical Field
The invention relates to the technical field of diesel engine EECU fault detection, in particular to an excitation signal generation method and an excitation signal generation system.
Background
The machineshop car is the most common equipment in infrastructure construction, and most machineshop cars use a diesel engine. The EECU is used for controlling the coordination operation among all parts of the engineering truck, and the failure of the EECU can cause the construction period to be delayed and even cause safety accidents. The EECU diagnosis technology is used for debugging a control device by simulating an EECU excitation signal and is widely used for production and after sale of EECUs.
Due to different structures of the diesel engines, the structures of corresponding crankshaft and camshaft signal panels are different, so that the EECU excitation signals are various. Currently, the signal generator currently on the market generates the EECU excitation signal mainly from both hardware circuit simulation and virtual instrument simulation. In the aspect of hardware circuit simulation, a corresponding signal generator is developed by means of a single chip microcomputer. The method is limited by programming and hardware technology, the generated signal precision is generally not high, the realization circuit is complex, the method is generally only used for a plurality of fixed diesel engines, and the structure is complex and has no universality. In the prior art, a virtual instrument simulation signal generator is used, a module package is used to define local signal units, and the units are sequentially spliced by means of a graphical interface development tool to form a complete excitation signal. Although the operation is simple, the precision of the simulation signal depends on whether the predefined local signal unit is accurate or not to a great extent, the reliability is low, and in addition, the expandability of the signal generator is reduced due to the modular structure, and the requirement of the diversity of the EECU excitation signals cannot be met.
Disclosure of Invention
In view of this, the present invention provides an excitation signal generation method and an excitation signal generation system, which can improve the accuracy of the EECU excitation signal, have the characteristics of simple structure composition, flexible configuration, universality and good expansibility, and are suitable for implementing signal simulation for various diesel generators.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows:
a method of generating an excitation signal, comprising:
loading signal characteristic parameters, wherein the signal characteristic parameters comprise crankshaft signal parameters and camshaft signal parameters, and the crankshaft signal parameters comprise a crankshaft signal type KtypeCrankshaft voltage amplitude AKAnd the crankshaft signal is inverted iKNumber of crankshaft turns NrevTotal number of teeth NtotA plurality of teeth NmulNumber of missing teeth NmisSine multiple s of missing tooth1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3Crankshaft voltage offset Voffset-KThe camshaft signal parameter comprises a camshaft type MtypeCamshaft voltage amplitude AMCamshaft signal negation iMNumber of protrusion pulses NpulMultiple of bump pulse period mu, initial position offset LoffsetNumber of spaced pulses NintInserting pulse interval DintCamshaft voltage offset Voffset-M；
Storing the signal characteristic parameters into an EECU excitation signal configuration file;
setting the frequency F and sampling rate F of the EECU excitation signal in the system program global variabless；
Performing segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal;
shifting the voltage of the generated EECU excitation signal upwards;
and outputting the EECU excitation signal after voltage deviation through a channel of a data acquisition card.
Preferably, the EECU excitation signal includes a crankshaft signal and a camshaft signal, the EECU excitation signal profile includes a crankshaft signal profile and a camshaft signal profile, and the storing the signal characteristic parameter into the EECU excitation signal profile corresponding to the signal type includes:
storing a crankshaft signal parameter to the crankshaft signal profile;
storing camshaft signal parameters to the camshaft signal profile;
the sampling rate FsGreater than twice said frequency F, Fs>2f。
Preferably, when the signal characteristic parameter is the crankshaft signal parameter, the step of performing segment modeling on the EECU excitation signal based on the EECU excitation signal profile, and the step of generating the EECU excitation signal includes:
judging the crankshaft signal type Ktype；
When the crankshaft signal type is a Hall type, a square wave function with the duty ratio of 50% is adopted to model the multi-tooth part in the crankshaft signal to generate a Hall multi-tooth crankshaft signal yhk_mmp(x)：
Figure BDA0003006208090000031
The value range of the independent variable x is
Figure BDA0003006208090000032
The% represents a modulo operation;
modeling the tooth-lacking part in the crankshaft signal by adopting a square wave function with the duty ratio of 100% to obtain a Hall type tooth-lacking crankshaft signal yhk_mm s(x)：
Figure BDA0003006208090000033
The above-mentioned
Figure BDA0003006208090000034
Discrete points representing a single cycle, said
Figure BDA0003006208090000035
The total number of points of the multidentate moiety;
splicing the Hall multi-tooth crankshaft signal yhk_mmp(x) And the Hall type tooth-missing crankshaft signal yhk_mm s(x) Obtaining the crankshaft signal;
alternatively, the first and second electrodes may be,
when the crankshaft signal type is a magnetoelectric type, a sine function is adopted to model the multi-tooth part in the crankshaft signal to generate a magnetoelectric multi-tooth crankshaft signal ymk_zmp(x)：
Figure BDA0003006208090000036
The above-mentioned
Figure BDA0003006208090000037
Representing discrete fetching intervals;
according to the number of teeth NmisDetermining a type of the missing tooth portion in the crankshaft signal;
when the type of the tooth-missing part is a zero tooth-missing type, modeling the zero tooth-missing part in the crankshaft signal by adopting two sine waves with double frequencies to generate a magnetoelectric zero tooth-missing crankshaft signal ymk_zms(x) As magnetoelectric missing tooth crank signals:
Figure BDA0003006208090000038
the above-mentioned
Figure BDA0003006208090000041
Indicating that the argument x needs to be translated backwards by the NmulCounting the number of each period;
alternatively, the first and second electrodes may be,
when the type of the tooth lack part is a multi-tooth lack type, modeling is carried out on the multi-tooth lack part in the crankshaft signal by adopting two sine waves with double frequencies to generate a multi-tooth lack signal ymk_mp(x)：
Figure BDA0003006208090000042
Modeling a front tooth-missing sine part in the crankshaft signal by adopting a sine function to generate a front tooth-missing sine signal yf_sin(x)：
Figure BDA0003006208090000043
Modeling the front tooth-missing arc part in the crankshaft signal according to the radius r and the circle center coordinate (r, b) to generate a front tooth-missing arc signal yf_arc(x)：
Figure BDA0003006208090000044
Figure BDA0003006208090000045
b＝AKsin(2πs1)
Figure BDA0003006208090000046
Modeling the middle missing tooth horizontal line part in the crankshaft signal according to a square wave function with the duty ratio of 0 percent to generate a middle missing tooth horizontal line signal ym_line(x)：
Figure BDA0003006208090000047
Modeling a rear missing tooth circular arc part in the crankshaft signal based on the circle center coordinates (r, -b) to generate a rear missing tooth circular arc signal yb_arc(x)：
Figure BDA0003006208090000048
Figure BDA0003006208090000049
Modeling a rear tooth-missing sine part in the crankshaft signal according to a sine function to generate a rear tooth-missing sine signal yb_sin(x)：
Figure BDA0003006208090000051
Figure BDA0003006208090000052
Sequentially splicing the multiple missing tooth signals ymk_mp(x) The front missing tooth sinusoidal signal yf_sin(x) The front tooth-missing arc signal yf_arc(x) The middle missing tooth horizontal line signal ym_line(x) The arc signal y of the back missing toothb_arc(x) And the back missing tooth sinusoidal signal yb_sin(x) Obtaining the magnetoelectric missing tooth crankshaft signal; splicing the magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And the magnetoelectric missing tooth crankshaft signal is obtained to obtain the crankshaftA signal.
Preferably, when the signal characteristic parameter is the camshaft signal parameter, the step of modeling the EECU excitation signal in segments based on the EECU excitation signal profile includes:
the horizontal line length L of the camshaft is calculated,
Figure BDA0003006208090000053
judging the camshaft type Mtype；
When the camshaft is of a magnetoelectric type, a sine function is adopted to model a convex pulse part in the camshaft signal to obtain a convex pulse signal ys_p(x)：
Figure BDA0003006208090000054
Modeling a horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0% to obtain a horizontal line signal yhm_hl(x)：
Figure BDA0003006208090000055
Modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)：
Figure BDA0003006208090000061
Figure BDA0003006208090000062
According to the convex pulse signal ys_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulseImpulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal ys_p(x) And the horizontal line signal yhm_hl(x) Are spliced in sequence, the inserting mark pulse signal ym_p(x) The insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) Performing the following steps;
alternatively, the first and second electrodes may be,
when the camshaft type is a Hall type, modeling is carried out on a convex pulse part in the camshaft signal to generate a convex pulse signal yr_p(x)：
The μ is a multiple of the period of the bump pulse with reference to a signal of a single period, and when μ is 1,
Figure BDA0003006208090000063
when the value of mu is greater than 1,
Figure BDA0003006208090000064
modeling the horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0% to obtain the horizontal line signal yhm_hl(x)；
Modeling the insertion mark pulse position in the camshaft signal to obtain the insertion mark pulse signal ym_p(x)；
According to the convex pulse signal yr_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal yr_p(x) And the horizontal line signal yhm_hl(x) Spliced in sequence, the insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) In (1).
Preferably, shifting the voltage of the generated EECU excitation signal upward comprises:
when the signal characteristic parameter is the crankshaft signal parameter, the voltage of the generated EECU excitation signal is shifted upwards by Voffset-K；
Or when the signal characteristic parameter is the camshaft signal parameter, the voltage of the generated EECU excitation signal is shifted upwards by Voffset-M；
The EECU excitation signal after the voltage offset is output through a channel of a data acquisition card comprises the following steps:
when the EECU excitation signal is the Hall type signal, outputting the EECU excitation signal after the deviation through two channels of the data acquisition card;
or when the EECU excitation signal is the magnetoelectric type signal, outputting the EECU excitation signal after the deviation through four channels of the data acquisition card.
The present invention also provides an excitation signal generation system comprising:
a loading module for loading signal characteristic parameters, wherein the signal characteristic parameters comprise crankshaft signal parameters and camshaft signal parameters, and the crankshaft signal parameters comprise a crankshaft signal type KtypeCrankshaft voltage amplitude AKAnd the crankshaft signal is inverted iKNumber of crankshaft turns NrevTotal number of teeth NtotA plurality of teeth NmulNumber of missing teeth NmisSine multiple s of missing tooth1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3Crankshaft voltage offset Voffset-KThe camshaft signal parameter comprises a camshaft type MtypeCamshaft voltage amplitude AMCamshaft signal negation iMNumber of protrusion pulses NpulMultiple of bump pulse period mu, initial position offset LoffsetNumber of spaced pulses NintInserting pulse interval DintCamshaft voltage offset Voffset-M；
The storage module is used for storing the signal characteristic parameters into an EECU excitation signal configuration file;
a setting module for setting the frequency F and the sampling rate F of the EECU excitation signal in the global variables of the system programs；
The signal generation module is used for carrying out segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal; further for shifting the voltage of the generated EECU excitation signal upwards;
and the output module is used for outputting the EECU excitation signal after the voltage offset through a channel of the data acquisition card.
Preferably, the EECU excitation signal includes a crankshaft signal and a camshaft signal, the EECU excitation signal profile includes a crankshaft signal profile and a camshaft signal profile,
the storage module is used for storing the crankshaft signal parameters to the crankshaft signal configuration file;
the storage module is used for storing camshaft signal parameters to the camshaft signal configuration file;
the sampling rate FsGreater than twice said frequency F, Fs>2f。
Preferably, when the signal characteristic parameter is the crankshaft signal parameter, the signal generating module includes:
a crankshaft type judging unit for judging the crankshaft signal type Ktype；
A multi-tooth part modeling unit for modeling the multi-tooth part in the crankshaft signal by adopting a square wave function with the duty ratio of 50% to generate a Hall multi-tooth crankshaft signal y when the crankshaft signal type is a Hall typehk_mmp(x)：
Figure BDA0003006208090000081
The value range of the independent variable x is
Figure BDA0003006208090000082
The% represents a modulo operation;
a tooth-missing part modeling unit for modeling the tooth-missing part in the crankshaft signal by adopting a square wave function with the duty ratio of 100 percent to obtain a Hall type tooth-missing crankshaft signal yhk_mm s(x)：
Figure BDA0003006208090000083
The above-mentioned
Figure BDA0003006208090000084
Discrete points representing a single cycle, said
Figure BDA0003006208090000085
The total number of points of the multidentate moiety;
a splicing unit for splicing the Hall multi-tooth crankshaft signal yhk_mmp(x) And the Hall type tooth-missing crankshaft signal yhk_mm s(x) Obtaining the crankshaft signal;
the multi-tooth part modeling unit is also used for modeling the multi-tooth part in the crankshaft signal by adopting a sine function when the crankshaft signal type is a magnetoelectric type to generate a magnetoelectric multi-tooth crankshaft signal ymk_zmp(x)：
Figure BDA0003006208090000091
The above-mentioned
Figure BDA0003006208090000092
Representing discrete fetching intervals;
a missing tooth part type determining unit for determining the number of missing teeth NmisDetermining a type of the missing tooth portion in the crankshaft signal;
a zero-missing-tooth part modeling unit used for modeling the zero-missing-tooth part in the crankshaft signal by adopting two sine waves with double frequencies to generate magnetism when the type of the missing-tooth part is the zero-missing-tooth typeElectric zero-missing-tooth crankshaft signal ymk_zms(x) As magnetoelectric missing tooth crank signals:
Figure BDA0003006208090000093
the above-mentioned
Figure BDA0003006208090000094
Indicating that the argument x needs to be translated backwards by the NmulCounting the number of each period;
a multiple-tooth-missing part modeling unit used for modeling the multiple-tooth-missing part in the crankshaft signal by adopting two sine waves with double frequencies when the type of the tooth-missing part is the multiple-tooth-missing type so as to generate a multiple-tooth-missing signal ymk_mp(x)：
Figure BDA0003006208090000095
A front tooth-missing sine part modeling unit for modeling the front tooth-missing sine part in the crankshaft signal by adopting a sine function to generate a front tooth-missing sine signal yf_sin(x)：
Figure BDA0003006208090000096
The modeling unit of the front tooth-missing arc part is used for modeling the front tooth-missing arc part in the crankshaft signal according to the radius r and the circle center coordinate (r, b) to generate a front tooth-missing arc signal yf_arc(x)：
Figure BDA0003006208090000101
Figure BDA0003006208090000102
b＝AKsin(2πs1)
Figure BDA0003006208090000103
A middle missing tooth horizontal line part modeling unit used for modeling the middle missing tooth horizontal line part in the crankshaft signal according to a square wave function with the duty ratio of 0 percent to generate a middle missing tooth horizontal line signal ym_line(x)：
Figure BDA0003006208090000104
A back missing tooth arc part modeling unit used for modeling the back missing tooth arc part in the crankshaft signal based on the circle center coordinates (r-b) to generate a back missing tooth arc signal yb_arc(x)：
Figure BDA0003006208090000105
Figure BDA0003006208090000106
A back tooth-missing sine part modeling unit used for modeling the back tooth-missing sine part in the crankshaft signal according to a sine function to generate a back tooth-missing sine signal yb_sin(x)：
Figure BDA0003006208090000107
Figure BDA0003006208090000108
The splicing unit is used for sequentially splicing the multiple missing tooth signals ymk_mp(x) The front missing tooth sinusoidal signal yf_sin(x) The front tooth-missing arc signal yf_arc(x) In the aboveHorizontal line signal y with teeth missing betweenm_line(x) The arc signal y of the back missing toothb_arc(x) And the back missing tooth sinusoidal signal yb_sin(x) Obtaining the magnetoelectric missing tooth crankshaft signal;
the splicing unit is also used for splicing the magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And obtaining the crankshaft signal by the magnetoelectric missing-tooth crankshaft signal.
Preferably, when the signal characteristic parameter is the camshaft signal parameter, the signal generating module includes:
a horizontal line length calculating unit for calculating a horizontal line length L of the camshaft,
Figure BDA0003006208090000111
a camshaft type determination unit for determining the camshaft type Mtype；
A convex pulse part modeling unit used for modeling the convex pulse part in the camshaft signal by adopting a sine function when the camshaft is in a magnetoelectric type to obtain a convex pulse signal ys_p(x)：
Figure BDA0003006208090000112
A horizontal line part modeling unit for modeling the horizontal line part in the camshaft signal according to a square wave function with a duty ratio of 0% to obtain a horizontal line signal yhm_hl(x)：
Figure BDA0003006208090000113
An insertion mark pulse position modeling unit for modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)：
Figure BDA0003006208090000114
Figure BDA0003006208090000115
A camshaft signal generating unit for generating a camshaft signal according to the protrusion pulse signal ys_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal ys_p(x) And the horizontal line signal yhm_hl(x) Are spliced in sequence, the inserting mark pulse signal ym_p(x) The insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) Performing the following steps;
the convex pulse part modeling unit is also used for modeling the convex pulse part in the camshaft signal to generate a convex pulse signal y when the camshaft is in a Hall typer_p(x)：
The μ is a multiple of the period of the bump pulse with reference to a signal of a single period, and when μ is 1,
Figure BDA0003006208090000121
when the value of mu is greater than 1,
Figure BDA0003006208090000122
the camshaft signal generating unit is used for generating a camshaft signal according to the projection pulse signal yr_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal yr_p(x) And the horizontal line signal yhm_hl(x) Are spliced in sequence, the plugPulse signal y of markm_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) In (1).
Preferably, the signal generating module further comprises a voltage offset unit for offsetting the generated voltage of the EECU excitation signal by V upwards when the signal characteristic parameter is the crank signal parameteroffset-K(ii) a The voltage offset unit is further used for offsetting the generated voltage of the EECU excitation signal upwards by V when the signal characteristic parameter is the camshaft signal parameteroffset-M；
The output module is used for outputting the EECU excitation signal after the deviation through two channels of the data acquisition card when the EECU excitation signal is the Hall type signal;
the output module is further configured to output the EECU excitation signal after the offset through four channels of the data acquisition card when the EECU excitation signal is the magnetoelectric type signal.
According to the technical scheme, the excitation signal generation method and the excitation signal generation system provided by the embodiment of the invention set the characteristic parameters of the EECU excitation signal to generate different types of crankshaft signals and camshaft signals, and carefully simulate the local characteristics of the excitation signal in a segmented modeling mode, so that the precision of the simulation signal generated by the signal generator is improved, the structure composition is simple, the configuration is flexible, and the method and the system have the characteristics of universality and good expansibility and can be suitable for realizing signal simulation of various diesel generators.
Drawings
Fig. 1 is a flowchart of a method for generating an excitation signal according to an embodiment of the present invention.
Fig. 2 is a structural diagram of an excitation signal generation system according to an embodiment of the present invention.
FIG. 3 is a diagram of characteristic parameters of a crankshaft signal and a camshaft signal according to the present invention.
FIG. 4 is a reference diagram of an interface for editing the characteristic parameters of the diesel engine EECU excitation signal.
FIG. 5 is a flowchart of the crankshaft signal characteristic parameter segmentation modeling in the invention.
FIG. 6 is a flow chart of sectional modeling of camshaft signal characteristic parameters in the invention.
FIG. 7 is a schematic diagram of a segmented model of a crankshaft signal and a camshaft excitation signal in accordance with the present invention.
FIG. 8 is a schematic diagram of an operation interface for selecting different channels to output a crankshaft signal and a camshaft signal according to the present invention.
Detailed Description
The technical scheme and the technical effect of the invention are further elaborated in the following by combining the drawings of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for generating an excitation signal, which specifically includes the following steps:
step S1, loading signal characteristic parameters;
step S2, storing the signal characteristic parameters into an EECU excitation signal configuration file;
step S3, setting the frequency F and the sampling rate F of the EECU excitation signal in the global variables of the system programs；
Step S4, carrying out segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal;
step S5, shifting the voltage of the generated EECU excitation signal upward;
and step S6, outputting the EECU excitation signal after voltage offset through a channel of the data acquisition card.
The signal characteristic parameters comprise crankshaft signal parameters and camshaft signal parameters, and the crankshaft signal parameters comprise a crankshaft signal type KtypeCrankshaft voltage amplitude AKAnd the crankshaft signal is inverted iKNumber of crankshaft turns NrevTotal number of teeth NtotA plurality of teeth NmulNumber of missing teeth NmisSine multiple s of missing tooth1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3Crankshaft voltage offset Voffset-KThe value ranges of the crankshaft signal parameters are shown in table 1; camshaft signal parameters include camshaft type MtypeCamshaft voltage amplitude AMCamshaft and camshaft deviceNumber negation iMNumber of protrusion pulses NpulMultiple of bump pulse period mu, initial position offset LoffsetNumber of spaced pulses NintInserting pulse interval DintCamshaft voltage offset Voffset-MThe value ranges of the camshaft signal parameters are shown in table 2.
Figure BDA0003006208090000141
TABLE 1
Figure BDA0003006208090000142
TABLE 2
The characteristic parameters in table 1 and table 2 are parameters of the diesel engine in various actual operating states, and are extracted from the waveforms of signals acquired by the oscilloscope from the crankshaft position sensor and the camshaft position sensor of the diesel engine, and the waveform of the signal acquired by the oscilloscope and the characteristic parameter extraction are performed before step S1.
As shown in fig. 4, the interface diagram for editing the characteristic parameters is an interface diagram for developing a characteristic parameter configuration module by using a LabVIEW virtual instrument, after the signal characteristic parameters are stored in an EECU excitation signal configuration file in step 2, the system needs to judge the rationality of the edited characteristic parameters, and the concrete way is to analyze the rationality according to the value range of each characteristic parameter in table 2 in table 1, and when the edited characteristic parameters are within the specified value range, the characteristic parameters are determined to be reasonably set, so that the configuration of crankshaft signals and camshaft signals can be performed, and as shown in fig. 2, the schematic diagram for editing and storing the diesel engine EECU excitation signal characteristic parameters is obtained. If the feature parameter setting is not reasonable, the feature parameter needs to be reconfigured.
The kind of excitation signal is first judged for distinguishing the type of the loaded configuration file. The EECU excitation signal comprises a crankshaft signal and a camshaft signal, and accordingly, the EECU excitation signal profile comprises a crankshaft signal profile and a camshaft signal profile, and the specific operation of storing the signal characteristic parameter into the EECU excitation signal profile corresponding to the signal type is as follows: storing the crankshaft signal parameters to a crankshaft signal configuration file; and storing the camshaft signal parameters to a camshaft signal configuration file.
The crankshaft signal is generated according to a crankshaft characteristic parameter configuration file. Firstly, the type of the crankshaft signal is judged, and the type comprises a magnetoelectric type and a Hall type. The magneto-electric crankshaft signal selects a sine function to perform segmented modeling, and the Hall-type crankshaft signal selects a square wave function to perform segmented modeling. Finally, the voltage of the generated crank signal is shifted upward.
The camshaft signal is a crankshaft signal generated from a crankshaft characteristic parameter profile. Firstly, the type of camshaft signals is judged, wherein the camshaft signals comprise a magnetoelectric type and a Hall type. The magneto-electric camshaft signal selects a sine function to perform segmented modeling, and the Hall camshaft signal selects a square wave function to perform segmented modeling. Secondly, the position of the insertion mark tooth is determined according to two parameters of the number of the front protruding pulses of the insertion mark tooth and the interval between the front protruding pulses and the rear protruding pulses. Finally, the voltage of the generated camshaft signal is shifted upward.
The expression of the sine function for simulating the magnetoelectric signal is shown in formula 1:
Figure BDA0003006208090000151
in the above formula 1, phi (x) represents the sine signal of the magnetoelectric signal, sin represents the sine function, i represents whether the signal is inverted, a represents the signal voltage amplitude, f represents the signal frequency,
Figure BDA0003006208090000161
representing discrete dot intervals, VoffsetRepresenting the signal voltage offset.
The square wave function expression used to simulate a hall-type signal is shown in equation 2.
Figure BDA0003006208090000162
In the above formula 2, ψ (x) represents a hall-type signal square wave signal, square represents a square wave function, i represents whether the signal is inverted, a represents a signal voltage amplitude, f represents a signal frequency,
Figure BDA0003006208090000163
representing discrete dot intervals, VoffsetRepresenting the signal voltage offset.
The expression of the square wave function square (p) is shown in equation 3.
Figure BDA0003006208090000164
In the above formula 3,% represents a modulo operation, λ duty represents a duty ratio, that is, a ratio of a high level to a whole period in one period.
And finally, selecting different data acquisition card channels according to the types of the EECU excitation signals to output the EECU excitation signals. A data acquisition card supporting synchronous output needs to be selected, and different types of channels are selected for outputting the generated crankshaft signal and the generated camshaft signal. The Hall type excitation signal needs two output channels, and the magnetoelectric type excitation signal needs four output channels.
When entering the excitation signal generation step, the EECU excitation signal global variables including the frequency F and the sampling rate F need to be configureds. The crankshaft signal and the camshaft signal are dynamically adjusted through a global variable to simulate the working state of the diesel engine at different rotating speeds. Wherein the frequency F ensures the duration of the unit period of the signal waveform and the sampling rate FsThe number of discrete points generated in a unit period of the signal waveform is ensured. According to the Nyquist sampling theorem, the sampling rate FsMust be greater than twice the highest frequency component f of the signal under test. As shown in equation (4).
Fs>2f (4)
When the signal characteristic parameter is the crankshaft signal parameter, step S4 performs segmented modeling on the EECU excitation signal based on the EECU excitation signal profile, and generating the EECU excitation signal includes:
judging crankshaft signal type Ktype；
When K istypeWhen the crankshaft signal type is 1, the crankshaft signal type is a Hall type, a multi-tooth part in the crankshaft signal is modeled by adopting a square wave function with the duty ratio of 50%, and a Hall multi-tooth crankshaft signal y is generatedhk_mmp(x)：
Figure BDA0003006208090000171
Wherein the value range of the independent variable x is
Figure BDA0003006208090000172
Modeling the tooth-missing part in the crankshaft signal by adopting a square wave function with the duty ratio of 100 percent to obtain a Hall type tooth-missing crankshaft signal yhk_mm s(x)：
Figure BDA0003006208090000173
Figure BDA0003006208090000174
The number of discrete points representing a single period,
Figure BDA0003006208090000175
the total number of points of the multi-tooth portion;
spliced Hall type multi-tooth crankshaft signal yhk_mmp(x) And Hall type missing tooth crankshaft signal yhk_mm s(x) And obtaining a crank signal which is a Hall crank signal, as shown by a group (c) of signals in FIG. 7.
When K istypeWhen the crankshaft signal type is 0, the crankshaft signal type is a magnetoelectric type, a multi-tooth part in the crankshaft signal is modeled by adopting a sine function, and a magnetoelectric multi-tooth crankshaft signal y is generatedmk_zmp(x)：
Figure BDA0003006208090000176
According to the number of teeth NmisDetermining the type of the tooth missing part in the crankshaft signal;
when N is presentmisWhen the frequency is 0, the type of the tooth-lacking part is a zero tooth-lacking type, two sine waves with double frequencies are adopted to model the zero tooth-lacking part in the crankshaft signal, and a magnetoelectric zero tooth-lacking crankshaft signal y is generatedmk_zms(x) As magnetoelectric missing tooth crank signals:
Figure BDA0003006208090000177
wherein the content of the first and second substances,
Figure BDA0003006208090000178
representing a discrete interval of the taking of points,
Figure BDA0003006208090000179
representing that the argument x needs to be translated backwards by NmulCounting the number of cycles so as to splice the front multi-tooth part; the period of 2 sinusoidal parts with double frequency of the zero missing tooth part is exactly the period of one sinusoidal part in the multi-tooth part, so the value range needs to be increased by discrete points of one period on the basis of the multi-tooth part, as shown in the group (a) of signals in fig. 7.
When N is presentmis>When 0, the type that lacks the tooth part is for lacking the tooth type more, and the many lack tooth bent axle signals of magnetoelectric divide into six segmentations and model, include: modeling multiple missing teeth, modeling a sine part of the front missing teeth, modeling a circular arc part of the front missing teeth, modeling a horizontal line of the middle missing teeth, modeling a circular arc part of the back missing teeth and modeling a sine part of the back missing teeth, wherein the sine multiple of the missing teeth is s1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3The relationship between the two is that,
Figure BDA0003006208090000181
for crankshaft informationThe multi-missing-tooth part in the number is modeled by two sine waves with double frequencies to generate a multi-missing-tooth signal ymk_mp(x)：
Figure BDA0003006208090000182
Modeling the front tooth-missing sine part in the crankshaft signal by adopting a sine function to generate a front tooth-missing sine signal yf_sin(x)：
Figure BDA0003006208090000183
In the above-mentioned formula 11, the first,
Figure BDA0003006208090000184
indicating that the argument x needs to be shifted backwards by a number of teeth NmulCounting the number of cycles so as to splice the front multi-tooth part; the period of the sine portion with the front missing teeth is s of the period of one sine portion in the multi-tooth portion1Multiple times, therefore, the value range needs to be increased by s on the basis of the multidentate part1Number of discrete points of multiple periods.
The front tooth-missing arc part needs to be spliced on the basis of the front sine part, so the arc radius r is the absolute value of the value b of the last point of the front sine part, the circle center coordinate is (r, b), the front tooth-missing arc part in the crankshaft signal is modeled according to the radius r and the circle center coordinate (r, b), and a front tooth-missing arc signal y is generatedf_arc(x)：
Figure BDA0003006208090000185
b＝AKsin(2πs1) (13)
Figure BDA0003006208090000186
In the above-mentioned formula 12, the first,
Figure BDA0003006208090000187
indicating that the argument x needs to be shifted backwards by a number of teeth NmulPlus a partial arc s1Counting the number of cycles to splice with the previously completed part; the period of the front missing tooth arc part is s of the period of one sine part in the multi-tooth part2Doubling, so the span of values needs to be increased by s on the basis of the completed part2Number of discrete points of multiple periods.
Modeling is carried out on the middle missing tooth horizontal line part in the crankshaft signal according to a square wave function with the duty ratio of 0 percent to generate a middle missing tooth horizontal line signal ym_line(x)：
Figure BDA0003006208090000191
Modeling the arc part of the back missing tooth in the crankshaft signal based on the circle center coordinates (r, -b) to generate an arc signal y of the back missing toothb_arc(x)：
Figure BDA0003006208090000192
Figure BDA0003006208090000193
Modeling a rear tooth-missing sine part in the crankshaft signal according to a sine function to generate a rear tooth-missing sine signal yb_sin(x)：
Figure BDA0003006208090000194
Sequentially splicing multiple missing tooth signals ymk_mp(x) Front missing tooth sinusoidal signal yf_sin(x) Arc signal y of front missing toothf_arc(x) Middle missing tooth horizontal line signal ym_line(x) Arc signal y of back missing toothb_arc(x) After andmissing tooth sinusoidal signal yb_sin(x) Obtaining a magnetoelectric missing tooth crankshaft signal as shown in the group (b) of signals in fig. 7;
spliced magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And obtaining a crankshaft signal by the magnetoelectric type missing-tooth crankshaft signal.
After the crank signal is generated by the above-mentioned scheme, step S5 is executed to shift the voltage of the generated EECU excitation signal by Voffset-K. When step S6 is executed to output signals, if the EECU excitation signal is a hall type signal, the offset EECU excitation signal is output through two channels of the data acquisition card, and if the EECU excitation signal is a magnetoelectric type signal, the offset EECU excitation signal is output through four channels of the data acquisition card, as shown in fig. 8.
When the signal characteristic parameter is a camshaft signal parameter, step S4 performs segmented modeling on the EECU excitation signal based on the EECU excitation signal profile, and generating the EECU excitation signal includes:
the horizontal line length L of the camshaft is calculated,
Figure BDA0003006208090000201
due to NrevThe length of the ring crank signal is equal to the length of the camshaft signal, thus passing Ntot*NrevCalculating the total length of the crankshaft, namely the total length of the camshaft; since the horizontal line lengths between the remaining bump pulses are identical except for the insertion mark pulse, the bump pulse number needs to be reduced by one; the total camshaft length is the length of the lobe pulse removed, and the remainder is the length of the horizontal line.
Judging camshaft type Mtype；
When M istypeWhen the signal is 0, the camshaft is of a magnetoelectric type, a convex pulse part in the camshaft signal is modeled by adopting a sine function, and a convex pulse signal y is obtaineds_p(x)：
Figure BDA0003006208090000202
Modeling is carried out on the horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0 percent to obtain a horizontal line signal yhm_hl(x)：
Figure BDA0003006208090000203
Modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)：
Figure BDA0003006208090000204
Figure BDA0003006208090000205
According to the bump pulse signal ys_p(x) Horizontal line signal yhm_hl(x) And an insertion mark pulse signal ym_p(x) Signal splicing is carried out to obtain a camshaft signal which is in a magnetoelectric type, wherein a convex pulse signal ys_p(x) And a horizontal line signal yhm_hl(x) Sequentially splicing the two, inserting mark pulse signal ym_p(x) Inserting the mark pulse signal ym_p(x) Inserting into horizontal line signal y in irregular arrangementhm_hl(x) As shown by the (d) set of signals in fig. 7.
When M istype>When 0, the camshaft type is Hall type, modeling is carried out on the convex pulse part in the camshaft signal, and a convex pulse signal y is generatedr_p(x)：
Mu is the period multiple of the bump pulse, and when mu is 1, two symmetrical square waves with 50% duty ratio are spliced to form a single bump pulse, as shown in formula (22):
Figure BDA0003006208090000211
when mu is greater than 1, the two symmetrical square waves with the duty ratio of 50% are respectively used on the left side and the right side, the square wave with the duty ratio of 100% is used in the middle to connect the left symmetrical square wave and the right symmetrical square wave, and the three parts are jointly spliced to form a single complete convex pulse, as shown in a formula (23):
Figure BDA0003006208090000212
modeling the horizontal line part in the camshaft signal according to the square wave function with the duty ratio of 0 percent to obtain a horizontal line signal yhm_hl(x)；
Modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)；
According to the bump pulse signal yr_p(x) Horizontal line signal yhm_hl(x) And an insertion mark pulse signal ym_p(x) Signal splicing is carried out to obtain a camshaft signal which is Hall type, wherein a convex pulse signal yr_p(x) And a horizontal line signal yhm_hl(x) Splicing in sequence, inserting mark pulse signal ym_p(x) Inserting horizontal line signals y in irregular arrangementhm_hl(x) As shown by the (e) set of signals in fig. 7.
After the camshaft signal is generated by the above-mentioned scheme, step S5 is executed to perform voltage offset to shift the voltage of the generated EECU excitation signal upward by Voffset-M. When step S6 is executed to output signals, if the EECU excitation signal is a hall type signal, the offset EECU excitation signal is output through two channels of the data acquisition card, and if the EECU excitation signal is a magnetoelectric type signal, the offset EECU excitation signal is output through four channels of the data acquisition card, as shown in fig. 8.
As shown in fig. 2, the present invention further provides an excitation signal generating system, which is the main body of the implementation of the method shown in fig. 1. The method specifically comprises the following steps:
and the loading module 21 is used for loading the signal characteristic parameters. The signal characteristic parameters loaded by the system comprise crankshaft signal parameters and camshaft signal parameters, wherein the crankshaft signal parameters are shown in a table 1, and the camshaft signal parameters are shown in a table 2;
the storage module 22 is used for storing the signal characteristic parameters into an EECU excitation signal configuration file;
a setting module 23 for setting the frequency F and the sampling rate F of the EECU excitation signal in the global variables of the system programs；
The signal generation module 24 is configured to perform segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate an EECU excitation signal; and also for shifting the voltage of the generated EECU excitation signal upwards;
and the output module 25 is used for outputting the EECU excitation signal after the voltage offset through a channel of the data acquisition card.
In an embodiment of the present invention, the EECU excitation signal includes a crankshaft signal and a camshaft signal, and accordingly, the EECU excitation signal profile includes a crankshaft signal profile and a camshaft signal profile, and the storage module 22 stores a crankshaft signal parameter into the crankshaft signal profile and stores a camshaft signal parameter into the camshaft signal profile.
The system configures EECU excitation signal global variables including frequency F and sampling rate FsThe crankshaft signal and the camshaft signal are dynamically adjusted through the global variable to simulate the working state of the diesel engine at different rotating speeds. Wherein the frequency F ensures the duration of the unit period of the signal waveform and the sampling rate FsThe number of discrete points generated in a unit period of the signal waveform is ensured. According to the Nyquist sampling theorem, the sampling rate FsMust be more than twice the highest frequency component F of the signal to be measureds>2f。
When the signal characteristic parameter is a crankshaft signal parameter, the signal generation module 24 generates a hall-type crankshaft signal through the crankshaft type determination unit 241, the multi-tooth portion modeling unit 242, the tooth-missing portion modeling unit 243, and the splicing unit 244:
a crankshaft type judging unit 241 for judging the crankshaft signal type Ktype: when K istype1-hour, crankshaft signal classThe model is a Hall type; when K istypeWhen the crankshaft signal type is 0, the crankshaft signal type is a magnetoelectric type;
the multi-tooth part modeling unit 242 is used for modeling the multi-tooth part in the crankshaft signal by adopting a square wave function with the duty ratio of 50% to generate a Hall multi-tooth crankshaft signal y when the crankshaft signal type is a Hall typehk_mmp(x)；
A tooth missing part modeling unit 243 for modeling by adopting a square wave function with a duty ratio of 100% to obtain a Hall type tooth missing crankshaft signal yhk_mm s(x)；
A splicing unit 244 for splicing the Hall multi-tooth crankshaft signal yhk_mmp(x) And Hall type missing tooth crankshaft signal yhk_mm s(x) And obtaining a crank signal which is a Hall crank signal, as shown by a group (c) of signals in FIG. 7.
When the crankshaft signal type is a magnetoelectric type, the signal generation module 24 generates a magnetoelectric crankshaft signal through the multiple-tooth-section modeling unit 245, the tooth-missing-section classification type determination unit 246, the zero-tooth-missing-section modeling unit 247, the multiple-tooth-missing-section modeling unit 248, the front tooth-missing-sine-section modeling unit 249, the front tooth-missing-arc-section modeling unit 2410, the middle tooth-missing-horizontal-line-section modeling unit 2411, the rear tooth-missing-arc-section modeling unit 2412, the rear tooth-missing-sine-section modeling unit 2413, and the splicing unit 244:
the multi-tooth part modeling unit 245 is further used for modeling the multi-tooth part in the crankshaft signal by adopting a sine function when the crankshaft signal type is a magnetoelectric type to generate a magnetoelectric multi-tooth crankshaft signal ymk_zmp(x)；
A missing teeth classification type determination unit 246 for determining the number of teeth NmisDetermining the type of the missing tooth part in the crankshaft signal: when N is presentmisWhen the number is 0, the type of the tooth-missing part is zero, and when N is equal tomis>When 0, the type of the tooth-lacking part is a tooth-lacking type;
a zero-missing-tooth part modeling unit 247, which is used for modeling the zero-missing-tooth part in the crankshaft signal by adopting two sine waves with double frequencies when the type of the missing-tooth part is the zero-missing-tooth type, so as to generate the magnetoelectric zero-missing-tooth crankshaft signalNumber ymk_zms(x) As the magnetoelectric missing-tooth crank signal, as shown by the (a) group signal in fig. 7;
a multiple-tooth-missing part modeling unit 248, which is used for modeling the multiple-tooth-missing part in the crankshaft signal by adopting two sine waves with double frequencies when the type of the tooth-missing part is the multiple-tooth-missing type, and generating a multiple-tooth-missing signal ymk_mp(x)；
A front missing tooth sinusoidal part modeling unit 249, configured to model the front missing tooth sinusoidal part in the crankshaft signal by using a sinusoidal function to generate a front missing tooth sinusoidal signal yf_sin(x)；
A modeling unit 2410 for modeling the arc part of the front missing tooth in the crankshaft signal according to the radius r and the coordinates (r, b) of the circle center to generate an arc signal y of the front missing toothf_arc(x)；
A middle-missing-tooth horizontal line part modeling unit 2411, configured to model a middle-missing-tooth horizontal line part in the crankshaft signal according to a square wave function with a duty ratio of 0%, and generate a middle-missing-tooth horizontal line signal ym_line(x)；
A back missing tooth arc part modeling unit 2412, configured to model a back missing tooth arc part in the crankshaft signal based on the circle center coordinates (r, -b) to generate a back missing tooth arc signal yb_arc(x)；
A back tooth-missing sine part modeling unit 2413, configured to model a back tooth-missing sine part in the crankshaft signal according to the sine function, and generate a back tooth-missing sine signal yb_sin(x)；
A splicing unit 244 for sequentially splicing the multi-missing-tooth signal ymk_mp(x) Front missing tooth sinusoidal signal yf_sin(x) Arc signal y of front missing toothf_arc(x) Middle missing tooth horizontal line signal ym_line(x) Arc signal y of back missing toothb_arc(x) And the back missing tooth sine signal yb_sin(x) Obtaining a magnetoelectric missing tooth crankshaft signal as shown in the group (b) of signals in fig. 7;
the splicing unit 244 is also used for splicing the magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And obtaining a crankshaft signal by the magnetoelectric type missing-tooth crankshaft signal.
When the signal characteristic parameter is a camshaft signal parameter, the signal generation module 24 generates a magneto-electric camshaft signal through the horizontal line length calculation unit 2414, the camshaft type determination unit 2415, the projection pulse part modeling unit 2416, the horizontal line part modeling unit 2417, the insertion mark pulse position modeling unit 2418, and the camshaft signal generation unit 2419:
a horizontal line length calculating unit 2414 for calculating a horizontal line length L of the camshaft;
a camshaft type judging unit 2415 for judging the camshaft type Mtype；
A convex pulse part modeling unit 2416, which is used for modeling the convex pulse part in the camshaft signal by adopting a sine function when the camshaft is in the magnetoelectric type to obtain a convex pulse signal ys_p(x)；
A horizontal line part modeling unit 2417, configured to model a horizontal line part in the camshaft signal according to a square wave function with a duty ratio of 0%, to obtain a horizontal line signal yhm_hl(x)；
An insertion mark pulse position modeling unit 2418 for modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)；
A camshaft signal generating unit 2419 for generating a camshaft signal based on the protrusion pulse signal ys_p(x) Horizontal line signal yhm_hl(x) And an insertion mark pulse signal ym_p(x) Performing signal splicing to obtain a camshaft signal, wherein the convex pulse signal ys_p(x) And a horizontal line signal yhm_hl(x) Sequentially splicing the two, inserting mark pulse signal ym_p(x) Inserting the mark pulse signal ym_p(x) Inserting into horizontal line signal y in irregular arrangementhm_hl(x) As shown by the (d) set of signals in fig. 7.
When the signal characteristic parameter is a camshaft signal parameter, the signal generation module 24 generates a hall-type camshaft signal through the protrusion pulse part modeling unit 2420, the horizontal line part modeling unit 2417, the insertion mark pulse position modeling unit 2418, and the camshaft signal generation unit 2421:
the convex pulse part modeling unit 2420 is also used for modeling the convex pulse part in the camshaft signal to generate a convex pulse signal y when the camshaft type is a Hall typer_p(x)；
A horizontal line part modeling unit 2417 for generating a horizontal line signal yhm_hl(x)；
An insertion mark pulse position modeling unit 2418 for generating an insertion mark pulse signal ym_p(x)；
A camshaft signal generating unit 2421 for generating the lobe pulse signal yr_p(x) Horizontal line signal yhm_hl(x) And an insertion mark pulse signal ym_p(x) Signal splicing is carried out to obtain a camshaft signal which is Hall type, wherein a convex pulse signal yr_p(x) And a horizontal line signal yhm_hl(x) Splicing in sequence, inserting mark pulse signal ym_p(x) Inserting horizontal line signals y in irregular arrangementhm_hl(x) As shown by the (e) set of signals in fig. 7.
After generating the EECU excitation signal, the EECU excitation signal is also shifted up:
a voltage deviation unit 2423 of the signal generation module 24 for upwardly deviating V the voltage of the generated EECU excitation signal when the signal characteristic parameter is the crank signal parameteroffset-K；
A voltage offset unit 2423, further used for shifting the voltage of the generated EECU excitation signal upwards by V when the signal characteristic parameter is the camshaft signal parameteroffset-M；
When the EECU excitation signal is output, different output channels need to be configured according to the type of the signal:
the output module 25 is used for outputting the EECU excitation signal after the offset through two channels of the data acquisition card when the EECU excitation signal is a Hall type signal;
the output module 25 is further configured to output the shifted EECU excitation signal through four channels of the data acquisition card when the EECU excitation signal is a magnetoelectric type signal.
Referring to fig. 5, the system performs a crank signal characteristic parameter segmentation modeling through steps S51 to S511, after the parameters are loaded in step S51, step S52 distinguishes the type of the EECU excitation signal that needs to be generated, if the EECU excitation signal is a magnetoelectric crank signal, steps S53 to S511 are performed, and if the EECU excitation signal is a hall crank signal, steps S513, S514, S515, S510, and S511 are performed.
Referring to fig. 6, the system performs a camshaft signal characteristic parameter segmented modeling through steps S61 to S614, after the parameters are loaded in step S61, step S65 distinguishes the type of EECU excitation signal that needs to be generated, if the EECU excitation signal is a magnetoelectric camshaft signal, steps S66 to S69 are performed, and if the EECU excitation signal is a hall camshaft signal, steps S610 to S613, step S67, step S68, and step S69 are performed.
According to the technical scheme, the excitation signal generation method and the excitation signal generation system provided by the embodiment of the invention set the characteristic parameters of the EECU excitation signal to generate different types of crankshaft signals and camshaft signals, and carefully simulate the local characteristics of the excitation signal in a segmented modeling mode, so that the precision of the simulation signal generated by the signal generator is improved, the structure composition is simple, the configuration is flexible, and the method and the system have the characteristics of universality and good expansibility and can be suitable for realizing signal simulation of various diesel generators.
The invention realizes the dynamic frequency modulation of the EECU excitation signal, thereby simulating the simulation excitation signal of the diesel engine under different working conditions. When the excitation signals under different rotating speed conditions need to be simulated, the synchronous change of the signals of the crankshaft and the camshaft can be realized by adjusting the frequency parameters of the signal generator. The set characteristic parameters are stored in a configuration file and can be directly called when needed next time, and the operation flow of the signal generator is greatly simplified.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. A method of generating an excitation signal, comprising:
loading signal characteristic parameters, wherein the signal characteristic parameters comprise crankshaft signal parameters and camshaft signal parameters, and the crankshaft signal parameters comprise a crankshaft signal type KtypeCrankshaft voltage amplitude AKAnd the crankshaft signal is inverted iKNumber of crankshaft turns NrevTotal number of teeth NtotA plurality of teeth NmulNumber of missing teeth NmisSine multiple s of missing tooth1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3Crankshaft voltage offset Voffset-KThe camshaft signal parameter comprises a camshaft type MtypeCamshaft voltage amplitude AMCamshaft signal negation iMNumber of protrusion pulses NpulMultiple of bump pulse period mu, initial position offset LoffsetNumber of spaced pulses NintInserting pulse interval DintCamshaft voltage offset Voffset-M；
Storing the signal characteristic parameters into an EECU excitation signal configuration file;
setting the frequency F and sampling rate F of the EECU excitation signal in the system program global variabless；
Performing segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal;
shifting the voltage of the generated EECU excitation signal upwards;
and outputting the EECU excitation signal after voltage deviation through a channel of a data acquisition card.
2. The method of generating an excitation signal according to claim 1,
the EECU excitation signal includes a crankshaft signal and a camshaft signal, the EECU excitation signal profile includes a crankshaft signal profile and a camshaft signal profile, and the storing the signal characteristic parameter into the EECU excitation signal profile corresponding to the signal type includes:
storing a crankshaft signal parameter to the crankshaft signal profile;
storing camshaft signal parameters to the camshaft signal profile;
the sampling rate FsGreater than twice said frequency F, Fs>2f。
3. The method of generating an excitation signal according to claim 2,
when the signal characteristic parameter is the crankshaft signal parameter, the step of performing segment modeling on the EECU excitation signal based on the EECU excitation signal configuration file, and the step of generating the EECU excitation signal comprises the following steps:
judging the crankshaft signal type Ktype；
When the crankshaft signal type is a Hall type, a square wave function with the duty ratio of 50% is adopted to model the multi-tooth part in the crankshaft signal to generate a Hall multi-tooth crankshaft signal yhk_mmp(x)：
Figure FDA0003446302630000021
Wherein the value range of the independent variable x is
Figure FDA0003446302630000022
% represents the modulo operation;
modeling the tooth-lacking part in the crankshaft signal by adopting a square wave function with the duty ratio of 100% to obtain a Hall type tooth-lacking crankshaft signal yhk_mm s(x)：
Figure FDA0003446302630000023
Wherein the content of the first and second substances,
Figure FDA0003446302630000024
represents a singleThe number of discrete points of the period,
Figure FDA0003446302630000025
the total number of points of the multidentate moiety;
splicing the Hall multi-tooth crankshaft signal yhk_mmp(x) And the Hall type tooth-missing crankshaft signal yhk_mm s(x) Obtaining the crankshaft signal;
alternatively, the first and second electrodes may be,
when the crankshaft signal type is a magnetoelectric type, a sine function is adopted to model the multi-tooth part in the crankshaft signal to generate a magnetoelectric multi-tooth crankshaft signal ymk_zmp(x)：
Figure FDA0003446302630000026
Wherein the content of the first and second substances,
Figure FDA0003446302630000027
representing discrete fetching intervals;
according to the number of teeth NmisDetermining a type of the missing tooth portion in the crankshaft signal;
when the type of the tooth-missing part is a zero tooth-missing type, modeling the zero tooth-missing part in the crankshaft signal by adopting two sine waves with double frequencies to generate a magnetoelectric zero tooth-missing crankshaft signal ymk_zms(x) As magnetoelectric missing tooth crank signals:
Figure FDA0003446302630000028
wherein the content of the first and second substances,
Figure FDA0003446302630000031
representing that the argument x needs to be translated backwards by NmulCounting the number of each period;
alternatively, the first and second electrodes may be,
the tooth-lacking part is of a multi-tooth-lacking typeIn the type, two sine waves with double frequencies are adopted to model multiple tooth-lack parts in the crankshaft signal to generate multiple tooth-lack signals ymk_mp(x)：
Figure FDA0003446302630000032
Modeling a front tooth-missing sine part in the crankshaft signal by adopting a sine function to generate a front tooth-missing sine signal yf_sin(x)：
Figure FDA0003446302630000033
Modeling the front tooth-missing arc part in the crankshaft signal according to the radius r and the circle center coordinate (r, b) to generate a front tooth-missing arc signal yf_arc(x)：
Figure FDA0003446302630000034
Figure FDA0003446302630000035
b＝AKsin(2πs1)
Figure FDA0003446302630000036
Modeling the middle missing tooth horizontal line part in the crankshaft signal according to a square wave function with the duty ratio of 0 percent to generate a middle missing tooth horizontal line signal ym_line(x)：
Figure FDA0003446302630000037
Based on a circleModeling the back missing tooth circular arc part in the crankshaft signal by the heart coordinate (r, -b) to generate a back missing tooth circular arc signal yb_arc(x)：
Figure FDA0003446302630000038
Figure FDA0003446302630000039
Modeling a rear tooth-missing sine part in the crankshaft signal according to a sine function to generate a rear tooth-missing sine signal yb_sin(x)：
Figure FDA0003446302630000041
Figure FDA0003446302630000042
Sequentially splicing the multiple missing tooth signals ymk_mp(x) The front missing tooth sinusoidal signal yf_sin(x) The front tooth-missing arc signal yf_arc(x) The middle missing tooth horizontal line signal ym_line(x) The arc signal y of the back missing toothb_arc(x) And the back missing tooth sinusoidal signal yb_sin(x) Obtaining the magnetoelectric missing tooth crankshaft signal;
splicing the magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And obtaining the crankshaft signal by the magnetoelectric missing-tooth crankshaft signal.
4. The method of generating an excitation signal according to claim 3, wherein the step of modeling the EECU excitation signal in segments based on the EECU excitation signal profile when the signal characteristic parameter is the camshaft signal parameter, the step of generating the EECU excitation signal comprises:
the horizontal line length L of the camshaft is calculated,
Figure FDA0003446302630000043
judging the camshaft type Mtype；
When the camshaft is of a magnetoelectric type, a sine function is adopted to model a convex pulse part in the camshaft signal to obtain a convex pulse signal ys_p(x)：
Figure FDA0003446302630000044
Modeling a horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0% to obtain a horizontal line signal yhm_hl(x)：
Figure FDA0003446302630000045
Modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)：
Figure FDA0003446302630000051
Figure FDA0003446302630000052
According to the convex pulse signal ys_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal ys_p(x) And the horizontal line signal yhm_hl(x) Are spliced in sequence, the plugPulse signal y of markm_p(x) The insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) Performing the following steps; alternatively, the first and second electrodes may be,
when the camshaft type is a Hall type, modeling is carried out on a convex pulse part in the camshaft signal to generate a convex pulse signal yr_p(x)：
The μ is a multiple of the period of the bump pulse with reference to a signal of a single period, and when μ is 1,
Figure FDA0003446302630000053
when the value of mu is greater than 1,
Figure FDA0003446302630000054
modeling the horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0% to obtain the horizontal line signal yhm_hl(x)；
Modeling the insertion mark pulse position in the camshaft signal to obtain the insertion mark pulse signal ym_p(x)；
According to the convex pulse signal yr_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal yr_p(x) And the horizontal line signal yhm_hl(x) Spliced in sequence, the insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) In (1).
5. The method of generating an excitation signal according to claim 4,
shifting the generated voltage of the EECU excitation signal upward comprises:
when the signal characteristic parameter is the crankshaft signal parameter, the voltage of the generated EECU excitation signal is shifted upwards by Voffset-K；
Or when the signal characteristic parameter is the camshaft signal parameter, the voltage of the generated EECU excitation signal is shifted upwards by Voffset-M；
The EECU excitation signal after the voltage offset is output through a channel of a data acquisition card comprises the following steps:
when the EECU excitation signal is the Hall type signal, outputting the EECU excitation signal after the deviation through two channels of the data acquisition card;
or when the EECU excitation signal is the magnetoelectric type signal, outputting the EECU excitation signal after the deviation through four channels of the data acquisition card.
6. An excitation signal generation system, comprising:
a loading module for loading signal characteristic parameters, wherein the signal characteristic parameters comprise crankshaft signal parameters and camshaft signal parameters, and the crankshaft signal parameters comprise a crankshaft signal type KtypeCrankshaft voltage amplitude AKAnd the crankshaft signal is inverted iKNumber of crankshaft turns NrevTotal number of teeth NtotA plurality of teeth NmulNumber of missing teeth NmisSine multiple s of missing tooth1Arc multiple s of tooth-lacking2Tooth missing horizontal line multiple s3Crankshaft voltage offset Voffset-KThe camshaft signal parameter comprises a camshaft type MtypeCamshaft voltage amplitude AMCamshaft signal negation iMNumber of protrusion pulses NpulMultiple of bump pulse period mu, initial position offset LoffsetNumber of spaced pulses NintInserting pulse interval DintCamshaft voltage offset Voffset-M；
The storage module is used for storing the signal characteristic parameters into an EECU excitation signal configuration file;
a setting module for setting the frequency F and the sampling rate F of the EECU excitation signal in the global variables of the system programs；
The signal generation module is used for carrying out segmented modeling on the EECU excitation signal based on the EECU excitation signal configuration file to generate the EECU excitation signal; further for shifting the voltage of the generated EECU excitation signal upwards;
and the output module is used for outputting the EECU excitation signal after the voltage offset through a channel of the data acquisition card.
7. The excitation signal generating system of claim 6, wherein the EECU excitation signal comprises a crankshaft signal and a camshaft signal, the EECU excitation signal profile comprises a crankshaft signal profile and a camshaft signal profile,
the storage module is used for storing the crankshaft signal parameters to the crankshaft signal configuration file;
the storage module is used for storing camshaft signal parameters to the camshaft signal configuration file;
the sampling rate FsGreater than twice said frequency F, Fs>2f。
8. The excitation signal generating system of claim 7, wherein when the signal characteristic parameter is the crankshaft signal parameter, the signal generating module comprises:
a crankshaft type judging unit for judging the crankshaft signal type Ktype；
A multi-tooth part modeling unit for modeling the multi-tooth part in the crankshaft signal by adopting a square wave function with the duty ratio of 50% to generate a Hall multi-tooth crankshaft signal y when the crankshaft signal type is a Hall typehk_mmp(x)：
Figure FDA0003446302630000071
Wherein the value range of the independent variable x is
Figure FDA0003446302630000072
% represents the modulo operation;
a tooth-missing part modeling unit for modeling the tooth-missing part in the crankshaft signal by adopting a square wave function with the duty ratio of 100 percent to obtain a Hall type tooth-missing crankshaft signal yhk_mm s(x)：
Figure FDA0003446302630000073
Wherein the content of the first and second substances,
Figure FDA0003446302630000074
the number of discrete points representing a single period,
Figure FDA0003446302630000075
the total number of points of the multidentate moiety;
a splicing unit for splicing the Hall multi-tooth crankshaft signal yhk_mmp(x) And the Hall type tooth-missing crankshaft signal yhk_mm s(x) Obtaining the crankshaft signal;
the multi-tooth part modeling unit is also used for modeling the multi-tooth part in the crankshaft signal by adopting a sine function when the crankshaft signal type is a magnetoelectric type to generate a magnetoelectric multi-tooth crankshaft signal ymk_zmp(x)：
Figure FDA0003446302630000081
Wherein the content of the first and second substances,
Figure FDA0003446302630000082
representing discrete fetching intervals;
a missing tooth part type determining unit for determining the number of missing teeth NmisDetermining a type of the missing tooth portion in the crankshaft signal;
a zero-missing-tooth part modeling unit used for modeling the zero-missing-tooth part in the crankshaft signal by adopting two sine waves with double frequencies when the type of the missing-tooth part is the zero-missing-tooth type, and generating a magnetoelectric zero-missing-tooth crankshaft signal ymk_zms(x) As magnetoelectric missing tooth crank signals:
Figure FDA0003446302630000083
wherein the content of the first and second substances,
Figure FDA0003446302630000084
representing that the argument x needs to be translated backwards by NmulCounting the number of each period;
a multiple-tooth-missing part modeling unit used for modeling the multiple-tooth-missing part in the crankshaft signal by adopting two sine waves with double frequencies when the type of the tooth-missing part is the multiple-tooth-missing type so as to generate a multiple-tooth-missing signal ymk_mp(x)：
Figure FDA0003446302630000085
A front tooth-missing sine part modeling unit for modeling the front tooth-missing sine part in the crankshaft signal by adopting a sine function to generate a front tooth-missing sine signal yf_sin(x)：
Figure FDA0003446302630000086
The modeling unit of the front tooth-missing arc part is used for modeling the front tooth-missing arc part in the crankshaft signal according to the radius r and the circle center coordinate (r, b) to generate a front tooth-missing arc signal yf_arc(x)：
Figure FDA0003446302630000087
Figure FDA0003446302630000091
b＝AKsin(2πs1)
Figure FDA0003446302630000092
A middle missing tooth horizontal line part modeling unit used for modeling the middle missing tooth horizontal line part in the crankshaft signal according to a square wave function with the duty ratio of 0 percent to generate a middle missing tooth horizontal line signal ym_line(x)：
Figure FDA0003446302630000093
A back missing tooth arc part modeling unit used for modeling the back missing tooth arc part in the crankshaft signal based on the circle center coordinates (r-b) to generate a back missing tooth arc signal yb_arc(x)：
Figure FDA0003446302630000094
Figure FDA0003446302630000095
A back tooth-missing sine part modeling unit used for modeling the back tooth-missing sine part in the crankshaft signal according to a sine function to generate a back tooth-missing sine signal yb_sin(x)：
Figure FDA0003446302630000096
Figure FDA0003446302630000097
The splicing unit is used for sequentially splicing the multiple missing tooth signals ymk_mp(x) The front missing tooth sinusoidal signal yf_sin(x) The front tooth-missing arc signal yf_arc(x) The middle missing tooth horizontal line signal ym_line(x) The arc signal y of the back missing toothb_arc(x) And the back missing tooth sinusoidal signal yb_sin(x) Obtaining the magnetoelectric missing tooth crankshaft signal;
the splicing unit is also used for splicing the magnetoelectric multi-tooth crankshaft signal ymk_zmp(x) And obtaining the crankshaft signal by the magnetoelectric missing-tooth crankshaft signal.
9. The excitation signal generating system according to claim 7, wherein when the signal characteristic parameter is the camshaft signal parameter, the signal generating module comprises:
a horizontal line length calculating unit for calculating a horizontal line length L of the camshaft,
Figure FDA0003446302630000101
a camshaft type determination unit for determining the camshaft type Mtype；
A convex pulse part modeling unit used for modeling the convex pulse part in the camshaft signal by adopting a sine function when the camshaft is in a magnetoelectric type to obtain a convex pulse signal ys_p(x)：
Figure FDA0003446302630000102
Horizontal line section modeling unit, usingModeling a horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0% to obtain a horizontal line signal yhm_hl(x)：
Figure FDA0003446302630000103
An insertion mark pulse position modeling unit for modeling the insertion mark pulse position in the camshaft signal to obtain an insertion mark pulse signal ym_p(x)：
Figure FDA0003446302630000104
Figure FDA0003446302630000105
A camshaft signal generating unit for generating a camshaft signal according to the protrusion pulse signal ys_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal ys_p(x) And the horizontal line signal yhm_hl(x) Are spliced in sequence, the inserting mark pulse signal ym_p(x) The insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) Performing the following steps;
the convex pulse part modeling unit is also used for modeling the convex pulse part in the camshaft signal to generate a convex pulse signal y when the camshaft is in a Hall typer_p(x)：
The μ is a multiple of the period of the bump pulse with reference to a signal of a single period, and when μ is 1,
Figure FDA0003446302630000111
when the value of mu is greater than 1,
Figure FDA0003446302630000112
the camshaft signal generating unit is used for modeling the horizontal line part in the camshaft signal according to a square wave function with the duty ratio of 0 percent to obtain the horizontal line signal yhm_hl(x) (ii) a Modeling the insertion mark pulse position in the camshaft signal to obtain the insertion mark pulse signal ym_p(x) (ii) a According to the convex pulse signal yt_p(x) The horizontal line signal yhm_hl(x) And the insertion mark pulse signal ym_p(x) Performing signal splicing to obtain the camshaft signal and the convex pulse signal yr_p(x) And the horizontal line signal yhm_hl(x) Spliced in sequence, the insertion mark pulse signal ym_p(x) Inserting the horizontal line signals y in an irregular arrangementhm_hl(x) In (1).
10. The excitation signal generating system of claim 9,
the signal generation module further comprises a voltage offset unit for upwardly offsetting V the voltage of the EECU excitation signal generated when the signal characteristic parameter is the crankshaft signal parameteroffset-K；
The voltage offset unit is further used for offsetting the generated voltage of the EECU excitation signal upwards by V when the signal characteristic parameter is the camshaft signal parameteroffset-M；
The output module is used for outputting the EECU excitation signal after the deviation through two channels of the data acquisition card when the EECU excitation signal is the Hall type signal;
the output module is further configured to output the EECU excitation signal after the offset through four channels of the data acquisition card when the EECU excitation signal is the magnetoelectric type signal.
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