CN114183225A - Exhaust pipe temperature drop detection method and device - Google Patents
Exhaust pipe temperature drop detection method and device Download PDFInfo
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- CN114183225A CN114183225A CN202111395469.6A CN202111395469A CN114183225A CN 114183225 A CN114183225 A CN 114183225A CN 202111395469 A CN202111395469 A CN 202111395469A CN 114183225 A CN114183225 A CN 114183225A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical Kinetics & Catalysis (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
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Abstract
The invention provides a method and a device for detecting the temperature drop of an exhaust pipe, comprising the following steps: detecting an amount of exhaust gas of the exhaust gas when the vehicle is in a starting state; when the exhaust gas amount reaches an emission limit value, detecting the DOC front temperature of the DOC and the engine running load; setting a calibration temperature when the DOC front temperature and the engine operation load meet the detection rule; detecting the temperature of the exhaust pipe and determining whether the exhaust pipe is in a cooling state; when the temperature is in a cooling state, detecting the current temperature before DOC; calculating the difference between the current DOC front temperature and the calibration temperature; judging whether the difference value is larger than a temperature difference threshold value or not; and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message. The device provided by the invention can accurately judge whether the temperature drop of the exhaust pipe matched with the whole vehicle meets the requirements, and can automatically report the error when the temperature drop of the exhaust pipe is overlarge, thereby avoiding the measurement work of the temperature drop of the exhaust pipe matched with a new vehicle type every time, greatly reducing the actual workload and saving the development cost.
Description
Technical Field
The invention relates to the technical field of vehicle exhaust temperature processing, in particular to a method and a device for detecting exhaust pipe temperature drop.
Background
According to the requirement of the national six post-processing matching specification, aiming at the fact that the temperature drop of an exhaust pipe matched by a national six engine host factory cannot exceed 20 ℃, the temperature drop of the exhaust pipe matched by the national six engine host factory is difficult to be measured by installing sensors on all vehicle types in actual use and matching, and the temperature drop of the matched exhaust pipe greatly affects the heat management capability of the whole vehicle.
The prior art relies on the blast pipe to punch, and the installation sensor measures the blast pipe temperature drop, and work load is big, and can not cover all motorcycle types, and the too big condition of blast pipe temperature drop appears easily appearing, and this problem direct influence engine heat management causes whole car dynamic property poor, the oil consumption is high, regeneration can't get into smoothly even.
Disclosure of Invention
In view of the above, the invention provides an exhaust pipe temperature drop detection method, by which whether the temperature drop of an exhaust pipe matched with a whole vehicle meets requirements can be accurately judged, an error is automatically reported when the temperature drop of the exhaust pipe is too large, the measurement work of the temperature drop of the exhaust pipe matched with a new vehicle type every time is avoided, the actual workload is greatly reduced, and the development cost is saved.
The invention also provides a device for detecting the temperature drop of the exhaust pipe, which is used for ensuring the realization and the application of the method in practice.
An exhaust pipe temperature drop detection method comprises the following steps:
detecting the amount of exhaust gas discharged by a vehicle in real time when the vehicle is in a starting state;
when the exhaust gas quantity of the vehicle reaches a preset emission limit value, detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of an engine of the vehicle and the engine running load of the engine in real time;
when the DOC front temperature of the DOC and the engine operation load meet a preset detection rule, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle;
detecting the temperature of an exhaust pipe of the exhaust pipe, and determining whether the exhaust pipe belongs to a cooling state;
when the exhaust pipe is in a cooling state, detecting the current DOC front temperature of the DOC;
calculating a difference value between the current DOC front temperature of the DOC and the calibration temperature;
judging whether the difference value is larger than a preset temperature difference threshold value or not;
and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message corresponding to the exhaust pipe.
Optionally, the method for detecting the temperature before DOC of the oxidation catalytic converter DOC of the vehicle engine and the engine operation parameters of the engine in real time includes:
detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
when the temperature before the DOC of the vehicle engine exceeds a preset temperature limit value, detecting the rotating speed and the fuel injection quantity of the engine in real time;
and when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value, determining that the operating load of the engine meets the detection rule.
The above method, optionally, the setting of the calibrated temperature of the turbine exhaust temperature of the engine mount of the vehicle includes:
determining a current location of the vehicle;
detecting the ambient temperature and the atmospheric pressure corresponding to the current position;
and setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
The above method, optionally, setting a calibration temperature of a turbo exhaust of an engine mount of the vehicle based on the ambient temperature and the atmospheric pressure includes:
acquiring the last detected ambient temperature and atmospheric pressure of the vehicle;
judging whether the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range or not;
if the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset difference range, setting the last set calibration temperature as the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle;
and if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within a preset difference range, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle based on the ambient temperature and the atmospheric pressure.
The above method, optionally, further includes:
updating the current position of the vehicle in real time, and detecting the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and if the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range, updating the currently set calibration temperature based on the environment temperature and the atmospheric pressure corresponding to the latest current position.
An exhaust pipe temperature drop detection device comprising:
the first detection unit is used for detecting the exhaust gas quantity of the exhaust gas discharged by the vehicle in real time when the vehicle is in a starting state;
the second detection unit is used for detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of the vehicle engine and the engine running load of the engine in real time when the exhaust gas quantity of the vehicle reaches a preset emission limit value;
the setting unit is used for setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle when the DOC front temperature of the DOC and the engine operation load meet the preset detection rule;
the third detection unit is used for detecting the temperature of the exhaust pipe and determining whether the exhaust pipe belongs to a cooling state or not;
the fourth detection unit is used for detecting the current DOC front temperature of the DOC when the exhaust pipe is in a cooling state;
the calculation unit is used for calculating the difference value between the current DOC front temperature of the DOC and the calibration temperature;
the judging unit is used for judging whether the difference value is larger than a preset temperature difference threshold value or not;
and the alarm unit is used for determining that the temperature of the exhaust pipe is excessively reduced and sending an alarm message corresponding to the exhaust pipe when the difference value is larger than the temperature difference threshold value.
The above apparatus, optionally, the second detecting unit includes:
the first detection subunit is used for detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
the second detection subunit is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the temperature before DOC of the vehicle engine exceeds a preset temperature limit value;
and the first determining subunit is used for determining that the engine operation load meets the detection rule when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value.
The above apparatus, optionally, the setting unit includes:
a second determining subunit for determining a current position of the vehicle;
the third detection subunit is used for detecting the ambient temperature and the atmospheric pressure corresponding to the current position;
the first setting subunit is used for setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
The above apparatus, optionally, the setting unit includes:
the acquisition subunit is used for acquiring the environment temperature and the atmospheric pressure detected last time by the vehicle;
the first judgment subunit is used for judging whether the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range or not;
the second setting subunit is used for setting the last set calibration temperature as the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle if the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the last detected ambient temperature and atmospheric pressure of the vehicle is within a preset difference range; and if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within a preset difference range, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle based on the ambient temperature and the atmospheric pressure.
The above apparatus, optionally, further comprises:
the fourth detection subunit is used for updating the current position of the vehicle in real time and detecting the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
the second judgment subunit is used for judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and the updating subunit is configured to update the currently set calibration temperature based on the latest ambient temperature and atmospheric pressure corresponding to the current position if the difference between the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the ambient temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range.
A storage medium comprises stored instructions, wherein when the instructions are executed, equipment where the storage medium is located is controlled to execute the exhaust pipe temperature drop detection method.
An electronic device includes a memory and one or more instructions, wherein the one or more instructions are stored in the memory and configured to be executed by one or more processors to perform the exhaust pipe temperature drop detection method.
Compared with the prior art, the invention has the following advantages:
the invention provides a method for detecting the temperature drop of an exhaust pipe, which comprises the following steps: detecting the amount of exhaust gas discharged by a vehicle in real time when the vehicle is in a starting state; when the exhaust gas quantity of the vehicle reaches a preset emission limit value, detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of an engine of the vehicle and the engine running load of the engine in real time; when the DOC front temperature of the DOC and the engine operation load meet a preset detection rule, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle; detecting the temperature of an exhaust pipe of the exhaust pipe, and determining whether the exhaust pipe belongs to a cooling state; when the exhaust pipe is in a cooling state, detecting the current DOC front temperature of the DOC; calculating a difference value between the current DOC front temperature of the DOC and the calibration temperature; judging whether the difference value is larger than a preset temperature difference threshold value or not; and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message corresponding to the exhaust pipe. The device provided by the invention can accurately judge whether the temperature drop of the exhaust pipe matched with the whole vehicle meets the requirements, and can automatically report the error when the temperature drop of the exhaust pipe is overlarge, thereby avoiding the measurement work of the temperature drop of the exhaust pipe matched with a new vehicle type every time, greatly reducing the actual workload and saving the development cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for detecting temperature drop of an exhaust pipe according to an embodiment of the present invention;
FIG. 2 is a flowchart of another method for detecting temperature drop of an exhaust pipe according to an embodiment of the present invention;
FIG. 3 is a flowchart of another method for detecting temperature drop of an exhaust pipe according to an embodiment of the present invention;
fig. 4 is a structural diagram of an exhaust pipe temperature drop detection apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
In this application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, and the terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention is operational with numerous general purpose or special purpose computing device environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multi-processor apparatus, distributed computing environments that include any of the above devices or equipment, and the like.
The embodiment of the invention provides a method for detecting the temperature drop of an exhaust pipe, which can be applied to various system platforms, wherein an execution main body of the method can be a computer terminal or a processor of various mobile devices, and a flow chart of the method is shown in figure 1 and specifically comprises the following steps:
s101: when the vehicle is in a starting state, the amount of exhaust gas of the exhaust gas discharged by the vehicle is detected in real time.
In the embodiment of the invention, when the vehicle is in the starting state, the amount of exhaust gas of the exhaust pipe of the vehicle to discharge the exhaust gas is detected.
S102: and when the exhaust gas quantity of the vehicle reaches a preset emission limit value, detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of the vehicle engine and the engine running load of the engine in real time.
In an embodiment of the present invention, a DOC (Oxidation Catalyst) is used to oxidize HC and CO in the exhaust gas of a vehicle while increasing the exhaust gas temperature. When the exhaust gas quantity reaches the limit value, the temperature before DOC and the running load of the engine need to be detected in real time,
the engine operation load includes an engine speed and an injection quantity of the engine.
Specifically, the real-time detection of the DOC front temperature of the oxidation type catalytic converter DOC of the vehicle engine and the engine operation parameters of the engine includes:
detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
when the temperature before the DOC of the vehicle engine exceeds a preset temperature limit value, detecting the rotating speed and the fuel injection quantity of the engine in real time;
and when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value, determining that the operating load of the engine meets the detection rule.
It can be understood that before detecting exhaust gas of the exhaust pipe, it is necessary to determine whether the vehicle meets a set condition, that is, a relatively stable working condition is judged through the change of the amount of exhaust gas, and then the DOC front temperature of the engine is required to exceed a certain limit value, and the rotating speed and the fuel injection amount both exceed certain limit values, that is, after the engine runs for a period of time, the vehicle is required to be above a necessary load.
S103: and when the temperature before the DOC of the DOC and the running load of the engine meet a preset detection rule, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle.
In the embodiment of the invention, the calibrated temperature is set as the detection standard of the temperature drop of the exhaust pipe.
S104: and detecting the temperature of the exhaust pipe, and determining whether the exhaust pipe belongs to a cooling state.
In the embodiment of the present invention, after determining that the exhaust pipe is in the temperature decrease state, the following processes of S105 to S108 are performed to further determine whether the exhaust pipe temperature decrease is excessive.
S105: and when the exhaust pipe belongs to a cooling state, detecting the current DOC front temperature of the DOC.
It should be noted that, when the exhaust pipe is in a cooling state, the DOC also stops working, and the temperature before the DOC is detected in real time.
S106: and calculating the difference between the current DOC front temperature of the DOC and the calibration temperature.
In the embodiment of the invention, the difference between the current temperature before DOC and the calibration temperature is calculated, and whether the temperature drop is too large is further determined.
S107: and judging whether the difference value is larger than a preset temperature difference threshold value or not.
S108: and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message corresponding to the exhaust pipe.
In the embodiment of the invention, when the temperature drop of the exhaust pipe is determined to be overlarge, the corresponding alarm message is sent out in time to prompt a user of a fault message, so that the influence of the overlarge temperature drop on the performance of the whole vehicle is avoided.
According to the exhaust pipe temperature drop detection method provided by the embodiment of the invention, when the vehicle is in a starting state, the DOC front temperature of the vehicle, the rotating speed of an engine and the fuel injection quantity need to be detected in real time. When the temperature, the rotating speed and the fuel injection quantity before the DOC exceed preset limit values, setting a calibration temperature, and using the calibration temperature as a standard for measuring whether the temperature drop of the exhaust pipe is too large. Detecting the temperature of the exhaust pipe, determining whether the exhaust pipe belongs to a cooling state, if so, detecting the current DOC front temperature, and calculating the difference value between the current DOC front temperature and the calibration temperature; when the difference value is larger than the temperature difference threshold value, the temperature of the exhaust pipe is represented to be excessively reduced, and an alarm message is sent.
By applying the method provided by the embodiment of the invention, whether the temperature drop of the exhaust pipe matched with the whole vehicle meets the requirement can be accurately judged, and when the temperature drop of the exhaust pipe is overlarge, an error is automatically reported, so that the measurement work of the temperature drop of the exhaust pipe matched with a new vehicle type every time is avoided, the actual workload is greatly reduced, and the development cost is saved.
When the DOC front temperature and the engine operation load meet the preset detection rule, the following process of setting the calibration temperature of the vortex rear exhaust temperature of the engine stand of the vehicle is carried out;
in the embodiment of the present invention, a process of setting a calibration temperature of a turbine rear exhaust temperature of an engine mount of a vehicle is shown in fig. 2, and specifically includes:
s201: determining a current location of the vehicle.
In an embodiment of the present invention, the current position of the vehicle may be a position range where the vehicle is currently traveling.
S202: and detecting the ambient temperature and the atmospheric pressure corresponding to the current position.
In the embodiment of the invention, the vehicle management module ECU of the vehicle is internally provided with the environment detection device, and the environment detection device detects the ambient temperature and the atmospheric pressure of the current surrounding environment.
S203: and setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
It is understood that the vehicle may be influenced by the ambient temperature and the atmospheric pressure when driven in different environments, for example, at the standard temperature and the standard atmospheric pressure, the parameters of each device in the vehicle are set according to the standard temperature and the standard atmospheric pressure, while in the plateau area, the temperature change is large, the plateau atmospheric pressure is low, and the parameters of each device of the vehicle are also modified according to the temperature and the atmospheric pressure.
In the method provided by the embodiment of the invention, the ambient temperature and the atmospheric pressure are detected according to the current position of the vehicle, and the calibration temperature is set according to the ambient temperature and the atmospheric pressure. Based on the method, the setting of the calibration temperature of the vehicle in other areas such as severe cold or plateau can be met.
Further, a process of setting the calibration temperature of the turbine exhaust temperature of the engine mount of the vehicle based on the ambient temperature and the atmospheric pressure is shown in fig. 3, and specifically includes:
s301: and acquiring the last detected ambient temperature and atmospheric pressure of the vehicle.
Specifically, whether the last detected ambient temperature and atmospheric pressure of the vehicle are stored is detected, if so, S302 is continuously executed, otherwise, S304 is directly executed.
S302: and judging whether the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range.
Specifically, whether the difference between the ambient temperature of the current position and the ambient temperature detected last time is within a first phase difference range and whether the difference between the atmospheric pressure of the current position and the atmospheric pressure detected last time is within a second phase difference range are judged;
if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within the preset phase difference range, executing S303; if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within the preset phase difference range, S304.
S303: and setting the last set calibration temperature as the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle.
S304: and setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
In the method provided by the embodiment of the invention, after the environmental temperature and the atmospheric pressure corresponding to the current position are detected, the environmental temperature and the atmospheric pressure detected last time are obtained, and the current environmental temperature and the atmospheric pressure are compared with the environmental temperature and the atmospheric pressure detected last time to determine whether the calibration temperature needs to be reset or not. If the current environment temperature and the atmospheric pressure are the same as the previous calibration temperature, the previous calibration temperature is directly set as the current calibration temperature, otherwise, a new calibration temperature needs to be set again.
Optionally, during the driving process of the vehicle, the calibration temperature may be corrected in real time, and the specific correction process includes:
updating the current position of the vehicle in real time, and detecting the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and if the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range, updating the currently set calibration temperature based on the environment temperature and the atmospheric pressure corresponding to the latest current position.
It can be understood that, when the vehicle is in the driving process, the current position of the vehicle is updated in real time, and each time the current position is updated, the ambient temperature and the atmospheric pressure corresponding to the latest current position are detected, so as to determine whether the set calibration temperature needs to be updated according to the current ambient temperature and the atmospheric pressure.
By applying the method provided by the embodiment of the invention, plateau correction and cold region correction can be carried out on the vortex rear exhaust temperature model, the temperature drop degree of the whole vehicle matched exhaust pipe is automatically judged and identified, and an error is automatically reported when the temperature drop is too large.
The specific implementation procedures and derivatives thereof of the above embodiments are within the scope of the present invention.
Corresponding to the method described in fig. 1, an embodiment of the present invention further provides an exhaust pipe temperature drop detection apparatus, which is used for implementing the method in fig. 1 specifically, and the exhaust pipe temperature drop detection apparatus provided in the embodiment of the present invention may be applied to a computer terminal or various mobile devices, and a schematic structural diagram of the exhaust pipe temperature drop detection apparatus is shown in fig. 4, and specifically includes:
a first detection unit 401 for detecting an amount of exhaust gas discharged from a vehicle in real time when the vehicle is in a start state;
a second detecting unit 402 for detecting in real time a DOC front temperature of an oxidation-type catalytic converter DOC of the vehicle engine and an engine operation load of the engine when an amount of exhaust gas of the vehicle reaches a preset emission limit;
a setting unit 403, configured to set a calibration temperature of a post-turbine exhaust temperature of an engine mount of the vehicle when a pre-DOC temperature of the DOC and the engine operating load meet a preset detection rule;
a third detecting unit 404, configured to detect an exhaust pipe temperature of an exhaust pipe, and determine whether the exhaust pipe is in a temperature-reduced state;
a fourth detecting unit 405, configured to detect a current DOC front temperature of the DOC when the exhaust pipe is in a cooling state;
a calculating unit 406, configured to calculate a difference between a current DOC front temperature of the DOC and the calibration temperature;
a judging unit 407, configured to judge whether the difference is greater than a preset temperature difference threshold;
and an alarm unit 408, configured to determine that the temperature drop of the exhaust pipe is too large when the difference is greater than the temperature difference threshold, and send an alarm message corresponding to the exhaust pipe.
In the exhaust pipe temperature drop detection device provided by the embodiment of the invention, when the vehicle is in a starting state, the DOC front temperature, the rotating speed of an engine and the fuel injection quantity of the vehicle need to be detected in real time. When the temperature, the rotating speed and the fuel injection quantity before the DOC exceed preset limit values, setting a calibration temperature, and using the calibration temperature as a standard for measuring whether the temperature drop of the exhaust pipe is too large. Detecting the temperature of the exhaust pipe, determining whether the exhaust pipe belongs to a cooling state, if so, detecting the current DOC front temperature, and calculating the difference value between the current DOC front temperature and the calibration temperature; when the difference value is larger than the temperature difference threshold value, the temperature of the exhaust pipe is represented to be excessively reduced, and an alarm message is sent.
By applying the device provided by the embodiment of the invention, whether the temperature drop of the exhaust pipe matched with the whole vehicle meets the requirement can be accurately judged, and when the temperature drop of the exhaust pipe is overlarge, an error is automatically reported, so that the measurement work of the temperature drop of the exhaust pipe matched with a new vehicle type every time is avoided, the actual workload is greatly reduced, and the development cost is saved.
In the apparatus provided in the embodiment of the present invention, the second detecting unit 402 includes:
the first detection subunit is used for detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
the second detection subunit is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the temperature before DOC of the vehicle engine exceeds a preset temperature limit value;
and the first determining subunit is used for determining that the engine operation load meets the detection rule when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value.
In the apparatus provided in the embodiment of the present invention, the setting unit 403 includes:
a second determining subunit for determining a current position of the vehicle;
the third detection subunit is used for detecting the ambient temperature and the atmospheric pressure corresponding to the current position;
the first setting subunit is used for setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
In the apparatus provided in the embodiment of the present invention, the setting unit 403 includes:
the acquisition subunit is used for acquiring the environment temperature and the atmospheric pressure detected last time by the vehicle;
the first judgment subunit is used for judging whether the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range or not;
the second setting subunit is used for setting the last set calibration temperature as the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle if the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the last detected ambient temperature and atmospheric pressure of the vehicle is within a preset difference range; and if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within a preset difference range, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle based on the ambient temperature and the atmospheric pressure.
The device provided by the embodiment of the invention further comprises:
the fourth detection subunit is used for updating the current position of the vehicle in real time and detecting the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
the second judgment subunit is used for judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and the updating subunit is configured to update the currently set calibration temperature based on the latest ambient temperature and atmospheric pressure corresponding to the current position if the difference between the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the ambient temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range.
The specific working processes of each unit and sub-unit in the exhaust pipe temperature drop detection device disclosed in the above embodiment of the present invention can refer to the corresponding contents in the exhaust pipe temperature drop detection method disclosed in the above embodiment of the present invention, and are not described herein again.
The embodiment of the invention also provides a storage medium, which comprises a stored instruction, wherein when the instruction runs, the equipment where the storage medium is located is controlled to execute the exhaust pipe temperature drop detection method.
An electronic device is provided in an embodiment of the present invention, and the structural diagram of the electronic device is shown in fig. 5, which specifically includes a memory 501 and one or more instructions 502, where the one or more instructions 502 are stored in the memory 501, and are configured to be executed by one or more processors 503 to perform the following operations according to the one or more instructions 502:
detecting the amount of exhaust gas discharged by a vehicle in real time when the vehicle is in a starting state;
when the exhaust gas quantity of the vehicle reaches a preset emission limit value, detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of an engine of the vehicle and the engine running load of the engine in real time;
when the DOC front temperature of the DOC and the engine operation load meet a preset detection rule, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle;
detecting the temperature of an exhaust pipe of the exhaust pipe, and determining whether the exhaust pipe belongs to a cooling state;
when the exhaust pipe is in a cooling state, detecting the current DOC front temperature of the DOC;
calculating a difference value between the current DOC front temperature of the DOC and the calibration temperature;
judging whether the difference value is larger than a preset temperature difference threshold value or not;
and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message corresponding to the exhaust pipe.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both.
To clearly illustrate this interchangeability of hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An exhaust pipe temperature drop detection method is characterized by comprising the following steps:
detecting the amount of exhaust gas discharged by a vehicle in real time when the vehicle is in a starting state;
when the exhaust gas quantity of the vehicle reaches a preset emission limit value, detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of an engine of the vehicle and the engine running load of the engine in real time;
when the DOC front temperature of the DOC and the engine operation load meet a preset detection rule, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle;
detecting the temperature of an exhaust pipe of the exhaust pipe, and determining whether the exhaust pipe belongs to a cooling state;
when the exhaust pipe is in a cooling state, detecting the current DOC front temperature of the DOC;
calculating a difference value between the current DOC front temperature of the DOC and the calibration temperature;
judging whether the difference value is larger than a preset temperature difference threshold value or not;
and when the difference value is larger than the temperature difference threshold value, determining that the temperature of the exhaust pipe is excessively reduced, and sending an alarm message corresponding to the exhaust pipe.
2. The method of claim 1, wherein the detecting in real time a pre-DOC temperature of an oxidation-type catalytic converter (DOC) of the vehicle engine and engine operating parameters of the engine comprises:
detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
when the temperature before the DOC of the vehicle engine exceeds a preset temperature limit value, detecting the rotating speed and the fuel injection quantity of the engine in real time;
and when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value, determining that the operating load of the engine meets the detection rule.
3. The method of claim 1, wherein setting a calibrated temperature of a post-turbo exhaust temperature of an engine mount of the vehicle comprises:
determining a current location of the vehicle;
detecting the ambient temperature and the atmospheric pressure corresponding to the current position;
and setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
4. The method of claim 3, wherein setting a calibrated temperature for a post-turbo exhaust temperature of an engine mount of the vehicle based on the ambient temperature and the atmospheric pressure comprises:
acquiring the last detected ambient temperature and atmospheric pressure of the vehicle;
judging whether the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range or not;
if the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset difference range, setting the last set calibration temperature as the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle;
and if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within a preset difference range, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle based on the ambient temperature and the atmospheric pressure.
5. The method of claim 4, further comprising:
updating the current position of the vehicle in real time, and detecting the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and if the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range, updating the currently set calibration temperature based on the environment temperature and the atmospheric pressure corresponding to the latest current position.
6. An exhaust pipe temperature drop detection device, characterized by comprising:
the first detection unit is used for detecting the exhaust gas quantity of the exhaust gas discharged by the vehicle in real time when the vehicle is in a starting state;
the second detection unit is used for detecting the DOC front temperature of an oxidation type catalytic converter (DOC) of the vehicle engine and the engine running load of the engine in real time when the exhaust gas quantity of the vehicle reaches a preset emission limit value;
the setting unit is used for setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle when the DOC front temperature of the DOC and the engine operation load meet the preset detection rule;
the third detection unit is used for detecting the temperature of the exhaust pipe and determining whether the exhaust pipe belongs to a cooling state or not;
the fourth detection unit is used for detecting the current DOC front temperature of the DOC when the exhaust pipe is in a cooling state;
the calculation unit is used for calculating the difference value between the current DOC front temperature of the DOC and the calibration temperature;
the judging unit is used for judging whether the difference value is larger than a preset temperature difference threshold value or not;
and the alarm unit is used for determining that the temperature of the exhaust pipe is excessively reduced and sending an alarm message corresponding to the exhaust pipe when the difference value is larger than the temperature difference threshold value.
7. The apparatus of claim 6, wherein the second detection unit comprises:
the first detection subunit is used for detecting whether the temperature of the vehicle engine before DOC exceeds a preset temperature limit value;
the second detection subunit is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the temperature before DOC of the vehicle engine exceeds a preset temperature limit value;
and the first determining subunit is used for determining that the engine operation load meets the detection rule when the rotating speed of the engine exceeds a preset rotating speed limit value and the fuel injection quantity exceeds a preset fuel injection quantity limit value.
8. The apparatus of claim 6, wherein the setting unit comprises:
a second determining subunit for determining a current position of the vehicle;
the third detection subunit is used for detecting the ambient temperature and the atmospheric pressure corresponding to the current position;
the first setting subunit is used for setting the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle based on the environment temperature and the atmospheric pressure.
9. The apparatus of claim 8, wherein the setting unit comprises:
the acquisition subunit is used for acquiring the environment temperature and the atmospheric pressure detected last time by the vehicle;
the first judgment subunit is used for judging whether the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is within a preset phase difference range or not;
the second setting subunit is used for setting the last set calibration temperature as the calibration temperature of the vortex back exhaust temperature of the engine pedestal of the vehicle if the difference value between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the last detected ambient temperature and atmospheric pressure of the vehicle is within a preset difference range; and if the difference between the ambient temperature and the atmospheric pressure of the vehicle at the current position and the ambient temperature and the atmospheric pressure detected last time by the vehicle is not within a preset difference range, setting the calibration temperature of the vortex rear exhaust temperature of the engine pedestal of the vehicle based on the ambient temperature and the atmospheric pressure.
10. The apparatus of claim 9, further comprising:
the fourth detection subunit is used for updating the current position of the vehicle in real time and detecting the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle;
the second judgment subunit is used for judging whether the difference value between the environment temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the environment temperature and the atmospheric pressure corresponding to the currently set calibration temperature is within the phase difference range or not;
and the updating subunit is configured to update the currently set calibration temperature based on the latest ambient temperature and atmospheric pressure corresponding to the current position if the difference between the ambient temperature and the atmospheric pressure corresponding to the latest current position of the vehicle and the ambient temperature and the atmospheric pressure corresponding to the currently set calibration temperature is not within the phase difference range.
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| CN114183225B (en) | 2022-10-25 |
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