CN114263521A - Sensor parameter correction method and device - Google Patents
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- CN114263521A CN114263521A CN202111657646.3A CN202111657646A CN114263521A CN 114263521 A CN114263521 A CN 114263521A CN 202111657646 A CN202111657646 A CN 202111657646A CN 114263521 A CN114263521 A CN 114263521A
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Abstract
The invention discloses a method and a device for correcting sensor parameters, which are applied to a control system of a vehicle, and are used for calculating a first upstream integral value and a first downstream integral value according to emission values detected by an upstream NOx sensor and a downstream NOx sensor acquired within a first time period; calculating a second upstream integral value and a second downstream integral value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired within a second time period, wherein the ammonia nitrogen ratio within the second time period is smaller than a first preset value, and the first time period is earlier than the second time period; and calculating a correction parameter according to the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value and the ammonia nitrogen ratio in the second time period, and correcting the sensing coefficient of the upstream NOx sensor based on the correction parameter. The sensing coefficient of the upstream NOx sensor can be corrected according to the correction parameter, so that the accuracy of the sensing parameter of the upstream NOx sensor is improved, and the phenomenon of ammonia gas leakage or excessive tail-emission NOx is reduced.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a method and a device for correcting sensor parameters.
Background
With the increasing of the climate crisis, environmental protection becomes an important measure for ensuring the sustainable development of the economic society, and therefore, various countries set a series of regulatory standards, and the exhaust emission standard of engines is an important component of the standards. In order to enable the content of nitrogen oxides NOx in the engine exhaust not to exceed the regulation standard, Selective Catalytic Reduction (SCR) box treatment needs to be carried out on the engine exhaust, the content of NOx is detected through a downstream NOx sensor, the urea injection quantity is controlled, the NOx and urea are enabled to react fully, and the content of NOx in the exhaust exhausted by the engine is enabled to be lower than the regulation standard.
According to the current national sixth-stage pollutant emission standard, an upstream NOx sensor is adopted to measure the NOx emission of an engine, the urea injection amount is calculated according to the measured value, and if the measurement deviation of the upstream NOx sensor causes urea overspray (ammonia gas leakage) or urea short-spraying (tail-emission NOx exceeds the standard), the method can be used for solving the problem that the prior NOx emission of the engine is poor in quality.
Disclosure of Invention
The invention provides a method and a device for correcting sensor parameters, which are used for solving the problem that the sensing parameters of an upstream NOx sensor are inaccurate in the prior art.
In a first aspect, an embodiment of the present invention provides a method for correcting a sensor parameter, which is applied to a control system of a vehicle, and the method includes:
calculating a first upstream integrated value and a first downstream integrated value according to emission values detected by an upstream nitrogen oxide NOx sensor and a downstream NOx sensor acquired in a first period;
calculating a second upstream integrated value and a second downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired for a second period of time;
calculating a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio in the second period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
In one possible embodiment, before calculating the first upstream integrated value and the first downstream integrated value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the first period, the method further includes:
and determining that the mileage of the vehicle is greater than or equal to a second preset value.
In one possible embodiment, the calculating a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio for the second period of time includes:
dividing the upstream and downstream integral ratio of the first time length and the upstream and downstream integral ratio of the second time length to obtain an integral change rate;
taking the difference value between 1 and the integral change rate as a target ammonia-nitrogen ratio;
taking the ratio of the ammonia-nitrogen ratio in the second time period to the target ammonia-nitrogen ratio as the correction parameter;
wherein the upstream-downstream integrated ratio for the first period of time is a ratio of the first upstream integrated value and the first downstream integrated value, and the upstream-downstream integrated ratio for the second period of time is a ratio of the second upstream integrated value and the second downstream integrated value.
In one possible embodiment, the correcting the sensing parameter of the upstream NOx sensor based on the correction parameter includes:
and taking the product of the current sensing parameter and the correction parameter as a target sensing parameter.
In one possible embodiment, before calculating the first upstream integrated value and the first downstream integrated value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the first period, after determining that the mileage of the vehicle is equal to or greater than a second preset value, the method further includes:
it is determined that a change in a ratio of the emission value detected by the upstream NOx sensor to the emission value detected by the downstream NOx sensor is within a preset range.
In a second aspect, an embodiment of the present invention provides a sensor parameter correction apparatus, which is applied to a control system of a vehicle, and includes:
a first calculation unit that calculates a first upstream integrated value and a first downstream integrated value based on emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired for a first period of time;
a second calculation unit configured to calculate a second upstream integrated value and a second downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in a second period;
a correction unit configured to calculate a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio for the second period of time, and correct the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
In a possible embodiment, the apparatus further comprises:
and the first determination unit is used for determining that the mileage of the vehicle is greater than or equal to a second preset value.
In a possible implementation, the correction unit is specifically configured to:
dividing the upstream and downstream integral ratio of the first time length and the upstream and downstream integral ratio of the second time length to obtain an integral change rate;
taking the difference value between 1 and the integral change rate as a target ammonia-nitrogen ratio;
taking the ratio of the ammonia-nitrogen ratio in the second time period to the target ammonia-nitrogen ratio as the correction parameter;
wherein the upstream-downstream integrated ratio for the first period of time is a ratio of the first upstream integrated value and the first downstream integrated value, and the upstream-downstream integrated ratio for the second period of time is a ratio of the second upstream integrated value and the second downstream integrated value.
In a possible embodiment, the correction unit is further configured to:
and taking the product of the current sensing parameter and the correction parameter as a target sensing parameter.
In a possible embodiment, the apparatus further comprises:
a second determination unit for determining that a change in a ratio of the emission value detected by the upstream NOx sensor to the emission value detected by the downstream NOx sensor is within a preset range.
The invention has the following beneficial effects:
the invention discloses a method and a device for correcting sensor parameters, which are applied to a control system of a vehicle, and the method comprises the following steps of firstly, calculating a first upstream integral value and a first downstream integral value according to emission values detected by an upstream nitrogen oxide (NOx) sensor and a downstream NOx sensor acquired within a first time period; then, calculating a second upstream integrated value and a second downstream integrated value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the second period; finally, calculating a correction parameter according to the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value and the ammonia-nitrogen ratio in the second time period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter; the ammonia nitrogen ratio in the second time period is smaller than the first preset value, the first time period is earlier than the second time period, and the problem that the sensing parameters of the upstream NOx sensor are inaccurate can be solved through the method. The sensing parameters of the upstream NOx sensor can be corrected according to the first upstream integral value, the first downstream integral value, the second upstream integral value, the second downstream integral value and the ammonia nitrogen ratio in the second time period, so that the problem that the sensing parameters of the upstream NOx sensor are inaccurate can be solved, and the phenomenon that ammonia gas leaks or tail emission NOx exceeds the standard is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for correcting a sensor parameter according to an embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating a method for correcting a sensor parameter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a sensor parameter correction apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a sensor parameter correction apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the pollutant emission standard of the sixth stage of the country adopts an upstream NOx sensor to measure the NOx original emission of an engine, the urea injection amount is calculated according to the measured value, and if the measurement deviation of the upstream NOx sensor causes urea overspray (ammonia gas leakage) or urea short-spraying (tail emission NOx exceeds the standard). Because the engine data is calibrated during development, production defects or sensor aging can cause deviation of measured data of an upstream NOx sensor, inaccurate NOx primary emission input and ammonia gas leakage or excessive tail emission NOx.
Based on the above problems, embodiments of the present invention provide a method and an apparatus for correcting sensor parameters, so as to solve the problem of inaccurate sensor parameters of an upstream NOx sensor in the prior art.
The method for correcting the sensor parameter provided by the exemplary embodiment of the present application is described below with reference to the accompanying drawings in conjunction with the application scenarios described above, and it should be noted that the application scenarios described above are only shown for the convenience of understanding the spirit and principle of the present application, and the embodiments of the present application are not limited in this respect.
As shown in fig. 1, a schematic flow chart of a method for correcting a sensor parameter according to an embodiment of the present invention is applied to a control system of a vehicle, and the method includes:
102, calculating a second upstream integral value and a second downstream integral value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in a second time period;
103, calculating a correction parameter according to the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value and the ammonia-nitrogen ratio in the second time period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
The invention discloses a method for correcting sensor parameters, which is applied to a control system of a vehicle.A first upstream integral value and a first downstream integral value are calculated according to emission values detected by an upstream nitrogen oxide (NOx) sensor and a downstream NOx sensor acquired within a first time period; then, calculating a second upstream integrated value and a second downstream integrated value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the second period; finally, calculating a correction parameter according to the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value and the ammonia-nitrogen ratio in the second time period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter; and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period. The sensing parameters of the upstream NOx sensor can be corrected according to the first upstream integral value, the first downstream integral value, the second upstream integral value, the second downstream integral value and the ammonia nitrogen ratio in the second time period, so that the problem that the sensing parameters of the upstream NOx sensor are inaccurate can be solved, and the phenomenon that ammonia gas leaks or tail emission NOx exceeds the standard is reduced.
The upstream NOx sensor in the embodiment of the invention is a nitrogen-oxygen sensor which is arranged at the upstream of the SCR box and is used for measuring the nitrogen-oxygen content, and the downstream NOx sensor is a nitrogen-oxygen sensor which is arranged at the downstream of the SCR box and is used for measuring the nitrogen-oxygen content.
The following describes the method for correcting the sensor parameters in detail:
as shown in fig. 2, a detailed flowchart of a method for correcting a sensor parameter according to an embodiment of the present invention is shown, where the method includes:
specifically, a sensor correction trigger curve can be set when the vehicle leaves a factory, the curve can be calibrated according to development data, in specific implementation, the sensor parameter correction trigger curve can be calibrated according to the driving mileage of the vehicle, and when the vehicle reaches the correction trigger mileage, the current upstream NOx sensor parameter is corrected;
for example, when the driving mileage of the vehicle exceeds 200 kilometers, the sensing parameters of the current sensor can be corrected, and the problem of inaccurate sensor parameters caused by aging of the sensor due to long-term use of the vehicle can be avoided by the method;
in addition, when the vehicle driving mileage is 0, the current upstream NOx sensor parameter can be corrected, and the problem of inaccurate sensor parameter caused by production error in batch production can be avoided through the method.
specifically, the inorganic fault is determined to include but not limited to a normal operating state of a Selective Catalytic Reduction (SCR) tank, and the operating condition meets the conditions including but not limited to the conditions that the emission temperature is greater than a preset value and the emission flow rate is stable.
specifically, the embodiment of the invention can improve the post-treatment temperature to remove ammonia by controlling and starting the post-treatment injection function.
specifically, the completion of ammonia purging may be determined according to whether a change between a ratio of an emission value detected by the upstream NOx sensor to an emission value detected by the downstream NOx sensor at the previous time and a change between a ratio of an emission value detected by the upstream NOx sensor to an emission value detected by the downstream NOx sensor at the current time is within a preset range, for example, when a change between a ratio of an emission value detected by the upstream NOx sensor to an emission value detected by the downstream NOx sensor at the previous time and a change between a ratio of an emission value detected by the upstream NOx sensor to an emission value detected by the downstream NOx sensor at the current time is less than or equal to 0.5, the completion of ammonia purging is determined.
specifically, the embodiment of the present invention may use the preset period duration as an integration interval to perform an integration operation on the NOx emission value detected by the upstream NOx sensor in the first duration to obtain a first upstream integration value a1, and use the preset period duration as an integration interval to perform an integration operation on the NOx emission value detected by the downstream NOx sensor in the first duration to obtain a first downstream integration value b 1.
In a specific implementation, the first duration and the second duration may be the same as the preset period duration.
wherein the ammonia-nitrogen ratio k can be controlled to be less than or equal to 1;
according to the embodiment of the invention, the preset period duration is used as the integration interval, the emission value of the oxynitride detected by the upstream NOx sensor in the second duration is subjected to integration operation to obtain the second upstream integration value a2, and the preset period duration is used as the integration interval, the emission value of the oxynitride detected by the downstream NOx sensor in the second duration is subjected to integration operation to obtain the second downstream integration value b 2.
It should be noted that the second period is later in time than the first period, and the second period is equal to the time span of the first period, for example, the first period is 0:00 to 0:15, and the integration operation is performed on the emission values of the nitrogen oxides detected by the upstream NOx sensor and the downstream NOx sensor at each time within the time span of 0:00 to 0:15, and the second period is 0:30 to 0:45, and the integration operation is performed on the emission values of the nitrogen oxides detected by the upstream NOx sensor and the downstream NOx sensor at each time.
specifically, the ratio of the ammonia-nitrogen ratio in the second period of time to the target ammonia-nitrogen ratio may be used as the correction parameter, i.e.
Wherein, alpha is a correction parameter,
is the upstream-downstream integral ratio of the first duration,
is the upstream-downstream integral ratio of the second duration,
is the integral change rate of the upstream/downstream integral ratio for the first period and the upstream/downstream integral ratio for the second period,
the target ammonia to nitrogen ratio.
In step 208, the sensing parameter δ of the upstream NOx sensor is corrected based on the correction parameter α.
In a specific implementation, the product of the current sensing parameter δ and the correction parameter α may be used as the target sensing parameter δ ', that is, δ' ═ δ × α.
In the embodiment of the invention, the sensing parameters of the upstream NOx sensor are corrected according to the first upstream integral value, the first downstream integral value, the second upstream integral value, the second downstream integral value and the ammonia nitrogen ratio in the second time period, and the upstream NOx sensor is used for collecting the emission value based on the corrected sensing parameters, so that the collection precision of the upstream NOx sensor can be improved, and the phenomenon of ammonia gas leakage or over-standard tail NOx can be reduced.
Based on the same inventive concept, the embodiment of the present invention further provides a sensor parameter correction apparatus, and the implementation of the apparatus may refer to the implementation of the sensor parameter correction method, and repeated details are not repeated.
As shown in fig. 3, a schematic structural diagram of a sensor parameter correction apparatus according to an embodiment of the present invention includes a first calculating unit 301, a second calculating unit 302, and a correcting unit 303:
a first calculation unit 301 that calculates a first upstream integrated value and a first downstream integrated value from the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired over the first period of time;
a second calculation unit 302 for calculating a second upstream integrated value and a second downstream integrated value from the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the second period;
a correction unit 303 for calculating a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio in the second period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
As shown in fig. 4, a specific structural schematic diagram of a sensor parameter correction device according to an embodiment of the present invention is shown, and the device further includes:
and a first determining unit 401, configured to determine that the mileage of the vehicle is greater than or equal to a second preset value.
Optionally, the correcting unit 303 is specifically configured to:
dividing the upstream and downstream integral ratio of the first time length and the upstream and downstream integral ratio of the second time length to obtain an integral change rate;
taking the difference value of 1 and the integral change rate as a target ammonia-nitrogen ratio;
taking the ratio of the ammonia-nitrogen ratio in the second time period to the target ammonia-nitrogen ratio as a correction parameter;
wherein the upstream-downstream integrated ratio for the first period of time is a ratio of the first upstream integrated value and the first downstream integrated value, and the upstream-downstream integrated ratio for the second period of time is a ratio of the second upstream integrated value and the second downstream integrated value.
Optionally, the modifying unit 303 is further configured to:
and taking the product of the current sensing parameter and the correction parameter as a target sensing parameter.
Optionally, the apparatus further comprises:
a second determination unit 402 for determining that a change in a ratio of the emission value detected by the upstream NOx sensor to the emission value detected by the downstream NOx sensor is within a preset range.
The invention discloses a sensor parameter correction method and a sensor parameter correction device, which are applied to a vehicle control system, calibrate a correction trigger curve of a sensor parameter according to the driving mileage of a vehicle, determine that the mileage of the vehicle is more than or equal to a second preset value, and correct a sensor coefficient. After the inorganic device is checked to be in fault and the working condition meets the condition, starting an after-treatment injection function, increasing the after-treatment temperature to clear ammonia, and calculating a first upstream integral value and a first downstream integral value according to emission values detected by an upstream nitrogen oxide NOx sensor and a downstream NOx sensor acquired within a first time period after ammonia clearing is finished; then, controlling the ammonia nitrogen ratio in the second time period to be smaller than a first preset value, and calculating a second upstream integral value and a second downstream integral value according to the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the second time period; according to the method, the problem that the sensing parameter of the upstream NOx sensor is inaccurate can be solved, and the phenomenon that ammonia gas leaks or tail emission NOx exceeds the standard can be further reduced.
Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of correcting a sensor parameter, applied to a control system of a vehicle, the method comprising:
calculating a first upstream integrated value and a first downstream integrated value according to emission values detected by an upstream nitrogen oxide NOx sensor and a downstream NOx sensor acquired in a first period;
calculating a second upstream integrated value and a second downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired for a second period of time;
calculating a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio in the second period, and correcting the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
2. The method according to claim 1, wherein before calculating the first upstream integrated value and the first downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the first period, further comprising:
and determining that the mileage of the vehicle is greater than or equal to a second preset value.
3. The method according to claim 1, wherein the calculating a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio in the second period of time includes:
dividing the upstream and downstream integral ratio of the first time length and the upstream and downstream integral ratio of the second time length to obtain an integral change rate;
taking the difference value between 1 and the integral change rate as a target ammonia-nitrogen ratio;
taking the ratio of the ammonia-nitrogen ratio in the second time period to the target ammonia-nitrogen ratio as the correction parameter;
wherein the upstream-downstream integrated ratio for the first period of time is a ratio of the first upstream integrated value and the first downstream integrated value, and the upstream-downstream integrated ratio for the second period of time is a ratio of the second upstream integrated value and the second downstream integrated value.
4. The method of claim 1, wherein the modifying the sensing parameter of the upstream NOx sensor based on the modification parameter comprises:
and taking the product of the current sensing parameter and the correction parameter as a target sensing parameter.
5. The method according to claim 2, wherein before calculating the first upstream integrated value and the first downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in the first period, after the determining that the mileage of the vehicle is equal to or greater than a second preset value, further comprising:
it is determined that a change in a ratio of the emission value detected by the upstream NOx sensor to the emission value detected by the downstream NOx sensor is within a preset range.
6. A sensor parameter correction device, applied to a control system of a vehicle, the device comprising:
a first calculation unit that calculates a first upstream integrated value and a first downstream integrated value based on emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired for a first period of time;
a second calculation unit configured to calculate a second upstream integrated value and a second downstream integrated value based on the emission values detected by the upstream NOx sensor and the downstream NOx sensor acquired in a second period;
a correction unit configured to calculate a correction parameter based on the first upstream integrated value, the first downstream integrated value, the second upstream integrated value, the second downstream integrated value, and the ammonia-nitrogen ratio for the second period of time, and correct the sensing parameter of the upstream NOx sensor based on the correction parameter;
and the ammonia nitrogen ratio in the second time period is smaller than a first preset value, and the first time period is earlier than the second time period.
7. The apparatus of claim 6, wherein the apparatus further comprises:
and the first determination unit is used for determining that the mileage of the vehicle is greater than or equal to a second preset value.
8. The apparatus according to claim 7, wherein the modification unit is specifically configured to:
dividing the upstream and downstream integral ratio of the first time length and the upstream and downstream integral ratio of the second time length to obtain an integral change rate;
taking the difference value between 1 and the integral change rate as a target ammonia-nitrogen ratio;
taking the ratio of the ammonia-nitrogen ratio in the second time period to the target ammonia-nitrogen ratio as the correction parameter;
wherein the upstream-downstream integrated ratio for the first period of time is a ratio of the first upstream integrated value and the first downstream integrated value, and the upstream-downstream integrated ratio for the second period of time is a ratio of the second upstream integrated value and the second downstream integrated value.
9. The apparatus of claim 6, wherein the modification unit is further to:
and taking the product of the current sensing parameter and the correction parameter as a target sensing parameter.
10. The apparatus of claim 7, wherein the apparatus further comprises:
a second determination unit for determining that a change in a ratio of the emission value detected by the upstream NOx sensor to the emission value detected by the downstream NOx sensor is within a preset range.
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