CN112682142A - Tampering detection method and device - Google Patents
Tampering detection method and device Download PDFInfo
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- CN112682142A CN112682142A CN202011538264.4A CN202011538264A CN112682142A CN 112682142 A CN112682142 A CN 112682142A CN 202011538264 A CN202011538264 A CN 202011538264A CN 112682142 A CN112682142 A CN 112682142A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The embodiment of the invention discloses a tamper detection method and device. The tampering detection method comprises the following steps: acquiring a detection signal of a pressure sensor; filtering the detection signal to filter out components of preset frequency in the detection signal; obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing; and determining whether the detection signal of the pressure sensor is tampered or not according to the difference. The technical scheme provided by the embodiment of the invention can identify whether the detection signal of the pressure sensor is falsified, thereby avoiding the occurrence of falsification and avoiding the occurrence of abnormal urea injection amount caused by the falsified detection signal of the pressure sensor.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a tamper detection method and device.
Background
With the continuous development of automotive electronic technology, the emission control of diesel engines has been paid attention by the national environmental protection department. Selective Catalytic Reduction (SCR) is a treatment process for nitrogen oxides (NOx) in diesel exhaust emissions, and is widely applied to diesel exhaust aftertreatment, and vehicle urea is used to perform Selective catalytic reduction on the nitrogen oxides (NOx), thereby achieving the purposes of energy saving and emission reduction.
The urea aqueous solution injection system in the SCR system can comprise a liquid storage device, a pump, a nozzle and a pressure sensor, and the nozzle is controlled to inject the urea aqueous solution into an engine exhaust pipe according to requirements, so that nitrogen oxides in the exhaust gas of the engine can be subjected to harmless treatment and discharged to the outside. The injection amount of the urea cannot be excessive, otherwise, excessive ammonia gas can volatilize into the environment, and secondary pollution is caused to the environment. The urea injection amount cannot be too small, otherwise the catalytic conversion efficiency of NOx in the catalyst is too low, and the emission amount of nitrogen oxides in the exhaust gas cannot be effectively reduced. The pressure sensor detects the pressure of the urea pump, and can be used for monitoring pressure fluctuation faults caused by high-speed operation of the pump, adjusting and calculating the duty ratio of the motor pump, participating in urea injection strategy operation and the like. Currently, a tampering device for the urea pump pressure signal is already present on the market, and the tampering device can tamper with the urea pump pressure sensor signal, so that the urea injection quantity is abnormal.
Disclosure of Invention
The embodiment of the invention provides a tampering detection method and a tampering detection device, which are used for identifying whether a detection signal of a pressure sensor is tampered or not, so that the occurrence of a tampering phenomenon is avoided, and the condition that the urea injection quantity is abnormal due to the use of the tampered detection signal of the pressure sensor is avoided.
In a first aspect, an embodiment of the present invention provides a tamper detection method, including:
acquiring a detection signal of a pressure sensor;
filtering the detection signal to filter out components of preset frequency in the detection signal;
obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing;
and determining whether the detection signal of the pressure sensor is tampered or not according to the difference.
Further, determining whether the detection signal of the pressure sensor is tampered with based on the difference includes:
calculating an integral value of the absolute value of the difference value in a preset time period;
from the integrated value, it is determined whether the detection signal of the pressure sensor is falsified.
Further, the determining whether the detection signal of the pressure sensor is tampered with based on the integrated value includes:
if the integral value is smaller than the first threshold value, increasing the number of times of tampering the detection signal of the pressure sensor by one;
and if the integral value is greater than or equal to the first threshold value, clearing the times of tampering the detection signals of the pressure sensor, and returning to execute the following operations: acquiring a detection signal of a pressure sensor;
and if the times of tampering the detection signal of the pressure sensor are larger than or equal to the second threshold value, determining that the detection signal of the pressure sensor is tampered, and alarming.
Further, the tamper detection method further includes:
if the detection signal of the pressure sensor is tampered less than the second threshold value, returning to execute the following operation: and acquiring a detection signal of the pressure sensor.
Further, the filtering process includes a recursive filtering process, the pressure sensor is disposed on a path connected between the pump and the injector, and the preset frequency is equal to a switching frequency of the injector.
In a second aspect, an embodiment of the present invention further provides a tamper detection device, including:
the acquisition module is used for acquiring a detection signal of the pressure sensor;
the filtering module is used for filtering the detection signal to filter out components of preset frequency in the detection signal;
the difference making module is used for obtaining the difference value of the detection signal before the filtering processing minus the detection signal after the filtering processing;
and the determining module is used for determining whether the detection signal of the pressure sensor is tampered or not according to the difference value.
Further, the determining module includes:
the integration unit is used for solving an integral value of the absolute value of the difference value in a preset time period;
a determination unit for determining whether the detection signal of the pressure sensor is tampered with based on the integrated value.
Further, the determination unit includes:
the number-of-times accumulation subunit is used for increasing the number of times of tampering the detection signal of the pressure sensor by one if the integral value is smaller than the first threshold value;
the frequency zero clearing subunit is used for clearing the frequency of tampering the detection signal of the pressure sensor and enabling the acquisition module to acquire the detection signal of the pressure sensor if the integral value is greater than or equal to the first threshold value;
and the tampering determination subunit is used for determining that the detection signal of the pressure sensor is tampered and alarming if the number of times that the detection signal of the pressure sensor is tampered is greater than or equal to a second threshold value.
Further, the obtaining module is further configured to obtain the detection signal of the pressure sensor if the number of times that the detection signal of the pressure sensor is tampered with is smaller than a second threshold.
Further, the filtering process includes a recursive filtering process, the pressure sensor is disposed on a path connected between the pump and the injector, and the preset frequency is equal to a switching frequency of the injector.
According to the technical scheme of the embodiment of the invention, the detection signal of the pressure sensor is obtained; filtering the detection signal to filter out components of preset frequency in the detection signal; obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing; and determining whether the detection signal of the pressure sensor is tampered or not according to the difference, thereby avoiding the occurrence of tampering phenomenon and avoiding the occurrence of abnormal urea injection amount caused by the use of the tampered detection signal of the pressure sensor.
Drawings
Fig. 1 is a flowchart of a tamper detection method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an exhaust treatment system of an engine according to an embodiment of the present invention;
FIG. 3 is a flow chart of another tamper detection method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another tamper detection method according to an embodiment of the present invention;
FIG. 5 is a flow chart of another tamper detection method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a tamper detection device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another tamper detection device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a tamper detection method. Fig. 1 is a flowchart of a tamper detection method according to an embodiment of the present invention. The method may be performed by a tamper detection device, which may be implemented in software and/or hardware, which may be integrated in an Electronic Control Unit (ECU) of the engine, etc. The tampering detection method specifically comprises the following steps:
and step 110, acquiring a detection signal of the pressure sensor.
Wherein, optionally, the pressure sensor is provided on a passage connecting between the pump and the injector. The pressure sensor may be used to detect the pressure generated by the fluid in the passage connecting between the pump and the injector. Fig. 2 is a schematic structural diagram of an exhaust gas treatment system of an engine according to an embodiment of the present invention. The exhaust port of the engine 1 communicates with the inlet of the selective catalytic oxidizer 50. The reservoir 20 may be used to hold an aqueous urea solution. The reservoir 20 may be a urea tank. The pump 30 may be used to deliver the aqueous urea solution in the reservoir 20 to the injector 40. The pump 30 may be an electric motor pump. The pump 30 may be a urea pump that draws urea from a urea tank and pressurizes it to the injectors via lines. The pressure sensor can detect the pressure of the urea pump, and can be used for monitoring pressure fluctuation faults caused by high-speed operation of the pump, adjusting and calculating the duty ratio of the motor pump, participating in urea injection strategy operation and the like. The electronic control unit 80 of the engine may be configured to control the opening or closing of the injector 40 based on the detection signal of the pressure sensor 60. The injector 40 may be an electrically controlled metering valve, and may be controlled to open or close by a control signal sent to the electrically controlled metering valve by a control module such as the electronic control unit 80 of the engine. The injector 40 may be a urea nozzle. The injector 40 may be disposed at an inlet of the selective catalytic oxidizer 50. Injector 40 injects urea prior to selective catalytic oxidizer 50 to form NH3, which reacts with NOx in the exhaust from engine 10 to remove NOx. An electronic control unit 80 of the engine may be used to control the duty cycle of the injector 40 to adjust the urea injection amount. The duty cycle of the injector 40 is the ratio of the length of time the injector 40 is open in each cycle to the cycle. The larger the duty ratio of the injector 40, the larger the urea injection amount. When the urea injection amount is constant, the duty ratio of the injector 40 is required to be smaller as the pressure of the pump 30 (corresponding to the pressure generated by the fluid in the passage connected between the pump 30 and the injector 40) is larger. The switching frequency or switching period of the injector 40 may be fixed. The detection signal of the pressure sensor 60 may be acquired while the injector 40 and the pump 30 are operating.
And step 120, filtering the detection signal to filter out a component with a preset frequency in the detection signal.
The detection signal is filtered, components with preset frequencies in the detection signal can be filtered, the amplitude of the components with the preset frequencies in the detection signal after filtering can be attenuated to zero, and the amplitudes of the components with the rest frequencies can not be attenuated and can be kept unchanged. Since the injector 40 is periodically opened and closed, the pressure on the passage connected between the pump 30 and the injector 40 is periodically changed according to the opening and closing of the injector 40, and thus the detection signal of the pressure sensor 60 that has not been tampered with is periodically changed according to the opening and closing of the injector 40, that is, the detection signal of the pressure sensor 60 contains a component of a preset frequency before the filtering process. The filtering process may implement filtering by a trap. Optionally, the filtering process includes a recursive (IIR) filtering process, that is, filtering is implemented by a recursive filter, and only a component of one frequency in the detection signal is filtered, and only a component of a preset frequency in the detection signal is filtered. The IIR filter is a recursive filter, and can realize steep filtering characteristics according to the difference of orders and coefficients. Alternatively, the preset frequency is equal to the switching frequency of the injector 40.
If the detection signal of the pressure sensor 60 is tampered with, the detection signal of the tampered pressure sensor 60 does not periodically change with the opening and closing of the injector 40, i.e., the detection signal of the pressure sensor 60 does not contain a component of the preset frequency before the filtering process.
And step 130, obtaining a difference value obtained by subtracting the filtered detection signal from the detection signal before the filtering processing.
If the detection signal of the pressure sensor 60 is not tampered, the detection signal of the pressure sensor 60 contains a component of the preset frequency before the filtering process, and the detection signal of the pressure sensor 60 does not contain a component of the preset frequency after the filtering process, the difference S0-S1 obtained by subtracting the detection signal S1 after the filtering process from the detection signal S0 before the filtering process is equivalent to the component of the preset frequency in the detection signal, and the component of the preset frequency in the detection signal is not zero. If the detection signal of the pressure sensor 60 is tampered with, the detection signal of the pressure sensor 60 does not contain a component of the preset frequency before the filtering process, and the detection signal of the pressure sensor 60 does not contain a component of the preset frequency after the filtering process, then the difference S0 '-S1' between the detection signal S0 'before the filtering process and the detection signal S1' after the filtering process will be zero. It is equivalent to that when the detection signal of the pressure sensor 60 is not falsified, the component of the preset frequency can be extracted from the detection signal of the pressure sensor 60, and when the detection signal of the pressure sensor 60 is falsified, the component of the preset frequency cannot be extracted from the detection signal of the pressure sensor 60.
And step 140, determining whether the detection signal of the pressure sensor is tampered or not according to the difference.
And judging whether the pressure signal of the urea pump is tampered or not by utilizing the difference relation between the filtered signal and the original signal. For example, if the amplitude of the waveform obtained by subtracting the difference value of the detection signal after the filtering process from the detection signal before the filtering process is smaller than the third threshold value and is close to 0, it indicates that the detection signal of the pressure sensor is tampered; and if the amplitude of the waveform of the difference value of the detection signal before the filtering processing and the detection signal after the filtering processing is subtracted is larger than or equal to a third threshold value, the detection signal of the pressure sensor is not tampered.
In the technical scheme of the embodiment, a detection signal of the pressure sensor is obtained; filtering the detection signal to filter out components of preset frequency in the detection signal; obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing; and determining whether the detection signal of the pressure sensor is tampered or not according to the difference, thereby avoiding the occurrence of tampering phenomenon and avoiding the occurrence of abnormal urea injection amount caused by the use of the tampered detection signal of the pressure sensor.
The embodiment of the invention provides another tampering detection method. Fig. 3 is a flowchart of another tamper detection method according to an embodiment of the present invention. On the basis of the above embodiment, the method includes:
and step 210, acquiring a detection signal of the pressure sensor.
Step 220, filtering the detection signal to filter out the component of the preset frequency in the detection signal.
Step 230, obtaining a difference value obtained by subtracting the filtered detection signal from the detection signal before the filtering process.
And step 240, calculating an integral value of the absolute value of the difference value within a preset time period.
The size of the preset time period may be set as required, which is not limited in the embodiment of the present invention. The preset time period may be greater than the switching period of the injector 40. By calculating the integral value of the absolute value of the difference value in the preset time period, abnormal conditions caused by accidental matters are eliminated, and the reliability of distinguishing is improved.
And step 250, determining whether the detection signal of the pressure sensor is tampered or not according to the integral value.
For example, if the integral value is smaller than the first threshold value and is close to 0, it indicates that the detection signal of the pressure sensor is tampered; if the integral value is larger than or equal to the first threshold value, the detection signal of the pressure sensor is not tampered.
The embodiment of the invention provides another tampering detection method. Fig. 4 is a flowchart of another tamper detection method according to an embodiment of the present invention. On the basis of the above embodiment, the method includes:
step 310, acquiring a detection signal of the pressure sensor.
And step 320, filtering the detection signal to filter out a component with a preset frequency in the detection signal.
Step 330, obtaining the difference value of the detection signal before filtering processing minus the detection signal after filtering processing.
And step 340, calculating an integral value of the absolute value of the difference value in a preset time period.
And step 350, if the integral value is smaller than the first threshold value, increasing the number of times of tampering of the detection signal of the pressure sensor by one.
And when the integral value is smaller than the first threshold value in each judgment result, increasing the frequency of tampering the detection signal of the pressure sensor by one, and considering that the detection signal of the pressure sensor is tampered until the integral value is smaller than the first threshold value in the judgment results continuously exceeding the second threshold value for the second time. The size of the first threshold may be set as required, which is not limited in the embodiment of the present invention.
And step 360, clearing the times of tampering the detection signal of the pressure sensor if the integral value is greater than or equal to the first threshold value.
And if the integral value is smaller than the first threshold value after the judgment result appears for less than the second threshold value continuously, and the integral value is larger than or equal to the first threshold value after the judgment result appears for one time, restarting the judgment process. After step 360 is performed, step 310 may be performed. Optionally, after the step 360 is executed and a second preset time period is set, the step 310 may be executed again.
And step 370, if the times of tampering the detection signal of the pressure sensor are larger than or equal to the second threshold value, determining that the detection signal of the pressure sensor is tampered, and alarming.
Wherein the second threshold may be an integer greater than or equal to 2. The size of the second threshold may be set according to needs, which is not limited in the embodiment of the present invention. If the signal is continuously tampered for a plurality of times, the 'urea pump signal is tampered', so that abnormal conditions caused by accidental matters are eliminated, and the distinguishing reliability is improved. The alarm mode can be that sound and light alarm is realized through a light emitting diode, a buzzer and the like, and alarm information and the like can be displayed through a display screen.
The embodiment of the invention provides another tampering detection method. Fig. 5 is a flowchart of another tamper detection method according to an embodiment of the present invention. On the basis of the above embodiment, the method includes:
and step 410, acquiring a detection signal of the pressure sensor.
Step 420, filtering the detection signal to filter out a component of a preset frequency in the detection signal.
Step 430, obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing.
And step 440, calculating an integral value of the absolute value of the difference value within a preset time period.
Step 450, determine whether the integral value is less than a first threshold.
If the integrated value is smaller than the first threshold, step 460 is executed. If the integral value is greater than or equal to the first threshold value, step 490 is performed.
Step 460, increasing the number of times the detection signal of the pressure sensor is tampered by one.
Step 470, determining whether the number of times the detection signal of the pressure sensor is tampered with is greater than or equal to a second threshold.
If the number of times the detection signal of the pressure sensor is tampered with is greater than or equal to the second threshold, it indicates that the detection signal is tampered with multiple times, and step 480 may be executed. If the number of times of tampering the detection signal of the pressure sensor is less than the second threshold, it indicates that there may be an abnormal situation caused by a contingency, so no alarm is given, the monitoring is continued, and the step 410 is returned to.
And step 480, determining that the detection signal of the pressure sensor is tampered, and alarming.
And step 490, clearing the times of tampering of the detection signals of the pressure sensor.
After step 490 is performed, step 410 may be performed.
The embodiment of the invention provides a tamper detection device. Fig. 6 is a schematic structural diagram of a tamper detection device according to an embodiment of the present invention. The tamper detection device may perform the tamper detection method provided by any of the embodiments of the invention. On the basis of the above embodiment, the tamper detection device includes: an acquisition module 510, a filtering module 520, a difference module 530, and a determination module 540.
The obtaining module 510 is configured to obtain a detection signal of the pressure sensor; the filtering module 520 is configured to filter the detection signal to filter out a component of a preset frequency in the detection signal; the difference module 530 is configured to obtain a difference value between the detection signal before filtering processing and the detection signal after filtering processing; the determining module 540 is configured to determine whether the detection signal of the pressure sensor is tampered with according to the difference.
The tamper detection device provided in the embodiment of the present invention can execute the tamper detection method in the above embodiment, and therefore, the tamper detection device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described here.
Optionally, on the basis of the foregoing embodiment, fig. 7 is a schematic structural diagram of another tamper detection device provided in the embodiment of the present invention, where the determining module 540 includes: an integration unit 541 and a determination unit 542.
The integration unit 541 is configured to find an integral value of an absolute value of the difference within a preset time period; the determination unit 542 is configured to determine whether the detection signal of the pressure sensor is tampered with, based on the integrated value.
Optionally, on the basis of the foregoing embodiment, with continuing reference to fig. 7, the determining unit 542 includes: a number-of-times accumulation sub-unit 5421, a falsification determination sub-unit 5422, and a number-of-times clear sub-unit 5423.
The number-of-times accumulation subunit 5421 is configured to increase, by one, the number of times that the detection signal of the pressure sensor is tampered with, if the integrated value is smaller than the first threshold value. The tampering determination subunit 5422 is configured to determine that the detection signal of the pressure sensor is tampered and alarm if the number of times that the detection signal of the pressure sensor is tampered is greater than or equal to the second threshold value. The number zero clearing subunit 5423 is configured to zero the number of times that the detection signal of the pressure sensor is tampered with if the integral value is greater than or equal to the first threshold, and enable the acquisition module to acquire the detection signal of the pressure sensor.
Optionally, the obtaining module 510 is further configured to obtain the detection signal of the pressure sensor if the number of times that the detection signal of the pressure sensor is tampered with is less than a second threshold.
Optionally, the filtering process comprises a recursive filtering process. And judging whether the pressure signal of the urea pump is tampered or not by utilizing the filtering characteristic of the IIR filter.
Alternatively, the pressure sensor 60 is provided on a passage connecting between the pump 30 and the injector 40.
Alternatively, the preset frequency is equal to the switching frequency of the injector 40.
Alternatively, the tamper detection device 70 may be provided in the electronic control unit 80 of the engine.
The tamper detection device can execute the tamper detection method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A tamper detection method, comprising:
acquiring a detection signal of a pressure sensor;
filtering the detection signal to filter out components of preset frequency in the detection signal;
obtaining a difference value of the detection signal before filtering processing minus the detection signal after filtering processing;
and determining whether the detection signal of the pressure sensor is tampered or not according to the difference value.
2. The tamper detection method according to claim 1, wherein determining whether the detection signal of the pressure sensor is tampered with based on the difference value includes:
calculating an integral value of the absolute value of the difference value in a preset time period;
determining whether the detection signal of the pressure sensor is falsified based on the integration value.
3. The tamper detection method according to claim 2, wherein determining whether the detection signal of the pressure sensor is tampered with based on the integration value includes:
if the integral value is smaller than a first threshold value, increasing the number of times of tampering detection signals of the pressure sensor by one;
if the integral value is greater than or equal to the first threshold value, clearing the times of tampering the detection signal of the pressure sensor, and returning to execute the following operations: acquiring a detection signal of the pressure sensor;
and if the times of tampering the detection signal of the pressure sensor are larger than or equal to a second threshold value, determining that the detection signal of the pressure sensor is tampered, and alarming.
4. The tamper detection method according to claim 3, further comprising:
if the number of times of tampering the detection signal of the pressure sensor is less than the second threshold value, returning to execute the following operations: and acquiring a detection signal of the pressure sensor.
5. The tamper detection method according to claim 1, wherein the filter process includes a recursive filter process, the pressure sensor is provided on a passage connected between a pump and an injector, and the preset frequency is equal to a switching frequency of the injector.
6. A tamper detection device, comprising:
the acquisition module is used for acquiring a detection signal of the pressure sensor;
the filtering module is used for filtering the detection signal to filter out components of preset frequency in the detection signal;
the difference making module is used for obtaining the difference value of the detection signal before the filtering processing minus the detection signal after the filtering processing;
and the determining module is used for determining whether the detection signal of the pressure sensor is tampered according to the difference value.
7. The tamper detection device of claim 6, wherein the determination module comprises:
the integration unit is used for solving an integral value of the absolute value of the difference value in a preset time period;
a determination unit for determining whether the detection signal of the pressure sensor is tampered with, based on the integration value.
8. The tamper detection device according to claim 7, wherein the determination unit includes:
the number-of-times accumulation subunit is used for increasing the number of times of tampering the detection signal of the pressure sensor by one if the integral value is smaller than a first threshold value;
a number zero clearing subunit, configured to, if the integral value is greater than or equal to the first threshold, clear the number of times that the detection signal of the pressure sensor is tampered with, and enable the acquisition module to acquire the detection signal of the pressure sensor;
and the tampering determination subunit is used for determining that the detection signal of the pressure sensor is tampered and giving an alarm if the number of times that the detection signal of the pressure sensor is tampered is greater than or equal to a second threshold value.
9. The tamper detection device according to claim 8,
the obtaining module is further configured to obtain the detection signal of the pressure sensor if the number of times that the detection signal of the pressure sensor is tampered is smaller than the second threshold.
10. The tamper detection device according to claim 6, wherein the filtering process includes a recursive filtering process, the pressure sensor is provided on a passage connected between a pump and an injector, and the preset frequency is equal to a switching frequency of the injector.
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| CN114592955A (en) * | 2022-03-17 | 2022-06-07 | 潍柴动力股份有限公司 | Method, device, system and storage medium for determining sulfur poisoning of SCR carrier |
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