CN112983610B - Catalyst detection method and hybrid vehicle - Google Patents
Catalyst detection method and hybrid vehicle Download PDFInfo
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- CN112983610B CN112983610B CN201911273025.8A CN201911273025A CN112983610B CN 112983610 B CN112983610 B CN 112983610B CN 201911273025 A CN201911273025 A CN 201911273025A CN 112983610 B CN112983610 B CN 112983610B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 155
- 238000001514 detection method Methods 0.000 title claims abstract description 108
- 230000002159 abnormal effect Effects 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000001301 oxygen Substances 0.000 claims description 115
- 229910052760 oxygen Inorganic materials 0.000 claims description 115
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 92
- 239000000446 fuel Substances 0.000 claims description 73
- 238000004590 computer program Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000005856 abnormality Effects 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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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
-
- 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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/11—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hybrid vehicles
-
- 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
-
- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hybrid Electric Vehicles (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a detection method of a catalyst and a hybrid vehicle, which are applied to the hybrid vehicle, wherein the hybrid vehicle comprises an engine and a generator, and the method comprises the following steps: under the condition that a catalyst detection request is obtained, a detection working condition is formed by controlling the rotating speed of the engine and the load of the generator; and under the detection working condition, detecting whether the catalyst is abnormal or not, so that the hybrid vehicle can accurately determine whether the catalyst is abnormal or not, and the detection of the catalyst is realized.
Description
Technical Field
The invention relates to the technical field of hybrid vehicles, in particular to a catalytic converter detection method and a hybrid vehicle.
Background
Hybrid vehicles are being operated in order to meet the energy-saving and environmental protection requirements of people on vehicles. The catalyst is used as an important part on the hybrid vehicle, and can convert harmful gases such as CO, HC, NOx and the like discharged by vehicle tail gas into harmless carbon dioxide, water and nitrogen through oxidation-reduction action, so that the environment-friendly emission of the hybrid vehicle is realized. However, the catalyst may be degraded or have other malfunctions, and if the catalyst is abnormal, the exhaust gas purification ratio is decreased, which may not only cause the emission of the vehicle to exceed the standard, but also cause the power of the engine of the hybrid vehicle to decrease, and may even affect the safety of the engine. Therefore, how to detect whether the catalyst of the hybrid vehicle is abnormal becomes an urgent problem to be solved.
Disclosure of Invention
The invention provides a catalyst detection method and a hybrid vehicle, which are used for detecting whether a catalyst of the hybrid vehicle is abnormal or not.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, the present invention provides a catalyst detection method applied to a hybrid vehicle including an engine and a generator, the method including:
under the condition that a catalyst detection request is obtained, a detection working condition is formed by controlling the rotating speed of the engine and the load of the generator;
and detecting whether the catalyst is abnormal or not under the detection working condition.
Optionally, the detection conditions are: the rotational speed of the engine is at a preset rotational speed and the load of the generator is at a preset load.
Optionally, the detecting whether the catalyst is abnormal includes:
acquiring the oxygen storage duration of the catalyst;
determining whether the catalyst is abnormal based on the oxygen storage period.
Optionally, the determining whether the catalyst is abnormal based on the oxygen storage period includes:
comparing the oxygen storage duration with a preset duration;
and if the oxygen storage time is longer than or equal to the preset time, determining that the catalyst is abnormal.
Optionally, the obtaining the oxygen storage duration of the catalyst comprises:
controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio;
under the condition that the air-fuel ratio is at the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst is increased to a first preset signal value, controlling the air-fuel ratio to be decreased to a second preset air-fuel ratio;
and acquiring the oxygen storage duration in the process that the rear oxygen signal is reduced to a second preset signal value under the condition that the air-fuel ratio is in the second preset air-fuel ratio.
Optionally, the oxygen storage time is as follows: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time period between the point in time when the air-fuel ratio falls to the second preset air-fuel ratio and the point in time when the post oxygen signal falls to the second preset signal value.
Optionally, before comparing the oxygen storage time with a preset time, the method further includes:
acquiring the working temperature and the air flow of the catalyst;
the preset time period is determined based on an operating temperature of the catalyst and an air flow rate.
Optionally, the determining the preset time period based on the operating temperature and the air flow of the catalyst comprises:
and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow.
Optionally, before the detection condition is formed by controlling the rotation speed of the engine and the load of the generator when the catalyst detection request is obtained, the method includes:
if the hybrid electric vehicle meets a preset detection condition, acquiring the catalyst detection request, wherein the preset detection condition comprises:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor has no fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
In a second aspect, an embodiment of the present invention also provides a hybrid vehicle including an engine and a generator, the hybrid vehicle including:
the control module is used for forming a detection working condition by controlling the rotating speed of the engine and the load of the generator under the condition of acquiring a catalyst detection request;
and the detection module is used for detecting whether the catalyst is abnormal or not under the detection working condition.
Optionally, the detection condition is: the rotational speed of the engine is at a preset rotational speed and the load of the generator is at a preset load.
Optionally, the detection module includes:
an oxygen storage duration acquisition unit for acquiring an oxygen storage duration of the catalyst;
a determination unit that determines whether the catalyst is abnormal, based on the oxygen storage period.
Optionally, the determining unit includes:
the comparison subunit is used for comparing the oxygen storage time length with a preset time length;
and the determining subunit is used for determining that the catalyst is abnormal if the oxygen storage time is longer than or equal to a preset time.
Optionally, the oxygen storage duration obtaining unit includes:
the first control subunit is used for controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio;
the second control subunit is used for controlling the air-fuel ratio to be reduced to a second preset air-fuel ratio under the condition that the air-fuel ratio is in the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst is increased to a first preset signal value;
and the duration acquisition subunit is used for acquiring the oxygen storage duration in the process that the post-oxygen signal is reduced to a second preset signal value under the condition that the air-fuel ratio is in the second preset air-fuel ratio.
Optionally, the oxygen storage time is: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time period between the point in time when the air-fuel ratio falls to the second preset air-fuel ratio and the point in time when the post oxygen signal falls to the second preset signal value.
Optionally, the determining unit further includes:
the temperature and flow acquiring subunit is used for acquiring the working temperature and the air flow of the catalyst;
a preset time period determination subunit operable to determine the preset time period based on an operating temperature and an air flow rate of the catalyst.
Optionally, the preset duration determining subunit is specifically configured to:
and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow.
Optionally, the hybrid vehicle further includes:
a request acquisition module configured to acquire the catalyst detection request if the hybrid vehicle satisfies a preset detection condition, wherein the preset detection condition includes:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor is not in fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
In a third aspect, an embodiment of the present invention further provides a hybrid vehicle, which is characterized by comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, wherein the computer program, when executed by the processor, implements the steps of the catalyst detection method described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the catalyst detection method described above.
In the embodiment of the invention, under the condition of acquiring the detection request of the catalytic converter, the detection working condition is formed by controlling the rotating speed of the engine and the load of the generator; and under the detection working condition, detecting whether the catalyst is abnormal or not, so that the hybrid vehicle can accurately determine whether the catalyst is abnormal or not, and the detection of the catalyst is realized.
Drawings
FIG. 1 is a schematic flow chart of a catalyst detection method provided by an embodiment of the invention;
fig. 2 is one of schematic structural diagrams of a hybrid vehicle provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a detection module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a determining unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an oxygen storage duration acquisition unit provided in an embodiment of the present invention;
FIG. 6 is a second schematic structural diagram of a determining unit according to an embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a hybrid vehicle according to the embodiment of the invention;
fig. 8 is a third schematic structural diagram of a hybrid vehicle 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
First embodiment
Referring to fig. 1, an embodiment of the present invention provides a catalyst detection method, which is applied to a hybrid vehicle, where the hybrid vehicle includes an engine and a generator, and as shown in fig. 1, the catalyst detection method includes the following steps:
and 101, under the condition that a catalyst detection request is obtained, forming a detection working condition by controlling the rotating speed of the engine and the load of the generator.
In this embodiment, when the hybrid vehicle acquires the catalyst detection request, the hybrid vehicle may control the rotation speed of the engine and the load of the generator, so that the hybrid vehicle forms a detection condition, and whether the catalyst is abnormal or not may be accurately detected under the detection condition.
The hybrid vehicle acquires the catalyst detection request, wherein the catalyst detection request may be acquired by an on-board terminal of the hybrid vehicle when receiving an operation input by a user for instructing detection of a catalyst; alternatively, the hybrid vehicle may automatically trigger the catalyst detection request according to a preset rule, for example, according to a preset time interval, so as to realize periodic detection of the catalyst.
In some embodiments, before the step 101, the method may further include:
if the hybrid electric vehicle meets a preset detection condition, acquiring the catalyst detection request, wherein the preset detection condition comprises:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor has no fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
Here, when the hybrid vehicle satisfies the preset detection condition, the hybrid vehicle acquires a catalyst detection request, so that the detection condition is set when the hybrid vehicle satisfies the preset detection condition, the possibility of triggering false detection of the hybrid vehicle is reduced, and the accuracy of detecting whether the catalyst is abnormal can be further improved.
The detection of the catalyst detection request may be that an engine management system of the hybrid vehicle sends the catalyst detection request to a vehicle control unit of the hybrid vehicle when the hybrid vehicle meets the preset detection condition, and the vehicle control unit controls the rotation speed of the engine and the load of the generator to form the detection condition when receiving the catalyst detection condition.
In addition, the above-described control of the rotation speed of the engine and the load of the generator may be performed by adjusting the rotation speed of the engine in an appropriate rotation speed range and adjusting the load of the generator in an appropriate load range.
Alternatively, the above-mentioned controlling the rotation speed of the engine and the load of the generator may be adjusting the rotation speed of the engine to a certain preset rotation speed, and adjusting the load of the generator to a certain preset load, that is, the detection condition is: the rotational speed of engine is in predetermineeing the rotational speed and the load of generator is in predetermineeing the load to make the detection operating mode of setting more be suitable for the detection of catalyst converter, further promote and detect accurate definite.
It should be noted that, when the engine is at the preset rotation speed and the generator is set to the preset load, the engine is only used for driving the generator to generate electricity, and the hybrid vehicle may further be provided with a driving motor, and the hybrid vehicle may be driven by the driving motor during running, so that the catalyst can be detected in a non-idle state of the vehicle, and the scene for detecting the catalyst is wider.
In addition, the hybrid vehicle may be a series hybrid vehicle in which an engine is connected to a generator and the engine supplies driving force for the generator to generate electric power, or a series-parallel hybrid vehicle in a series mode in which a load of the generator is actually a load carried by the engine when the engine supplies driving force to the generator.
And 102, detecting whether the catalyst is abnormal or not under the detection working condition.
In this embodiment, after the hybrid vehicle forms the detection condition through the controller engine and the generator, the hybrid vehicle can detect whether the catalyst is abnormal under the hybrid vehicle, so that the accuracy of detecting the abnormality of the catalyst can be improved.
The detection of the abnormality of the catalyst may be performed by any preset method or rule that can detect the abnormality of the catalyst.
In some embodiments, the detecting whether the catalyst is abnormal includes: acquiring the oxygen storage duration of the catalyst; determining whether the catalyst is abnormal based on the oxygen storage period. Here, the hybrid vehicle may determine whether the catalyst is abnormal according to the oxygen storage period of the catalyst, so that the accuracy of catalyst abnormality detection may be further improved.
The obtaining of the oxygen storage duration of the catalyst may be implemented according to a preset method or rule, and specifically, the obtaining of the oxygen storage duration of the catalyst may include: controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio; under the condition that the air-fuel ratio is at the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst is increased to a first preset signal value, controlling the air-fuel ratio to be decreased to a second preset air-fuel ratio; and acquiring the oxygen storage duration in the process that the rear oxygen signal is reduced to a second preset signal value under the condition that the air-fuel ratio is in the second preset air-fuel ratio.
In the process of adjusting the air-fuel ratio of the engine, the oxygen storage time of the catalyst is determined according to the change of the signal value of the backward tilt signal, so that the oxygen storage time of the catalyst can be accurately acquired, and the detection accuracy is further improved.
In this embodiment, the oxygen storage duration in the process of acquiring the value of the post-oxygen signal falling to the second preset signal value may be a duration between any two time points in the process of acquiring the value of the post-oxygen signal falling to the second preset signal value, and the duration is used as the oxygen storage duration.
In still further embodiments, the oxygen storage period is: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time length between the time point when the air-fuel ratio is reduced to the second preset air-fuel ratio and the time point when the back oxygen signal is reduced to the second preset signal value is longer, so that the method for acquiring the oxygen storage time length is more flexible, and the acquired oxygen storage time length is more referential.
In addition, the above determining whether the catalyst is abnormal based on the oxygen storage duration may be determining whether the catalyst is abnormal according to a preset rule based on the oxygen storage duration, specifically, the determining whether the catalyst is abnormal based on the oxygen storage duration includes: comparing the oxygen storage duration with a preset duration; and if the oxygen storage duration is greater than or equal to a preset duration, determining that the catalyst is abnormal. Here, by comparing the oxygen storage period with the preset period, the catalyst abnormality is determined according to the comparison result, which is easy to implement, so that the response speed of determining the catalyst abnormality can be increased.
Of course, in the case where the above-described oxygen storage period is less than the preset period, the hybrid vehicle may determine that the catalyst is normal.
It should be noted that the preset time period may be a preset and fixed time period.
Alternatively, in some embodiments, before comparing the oxygen storage time period with a preset time period, the method may further include: acquiring the working temperature and the air flow of the catalyst; the preset time period is determined based on an operating temperature of the catalyst and an air flow rate.
Here, since the operating temperature and the air flow of the catalyst also have an influence on the oxygen storage time of the catalyst, the preset time is determined by the operating temperature and the air flow of the catalyst, so that the preset time can be dynamically adjusted according to the operating temperature and the air flow of the catalyst, and the detection accuracy can be further improved.
In this embodiment, the determining the preset time period based on the operating temperature and the air flow of the catalyst may be a calculation formula among the preset temperature, the preset air flow and the preset time period in a hybrid vehicle, and the preset time period is calculated through the calculation formula.
Alternatively, in some embodiments, the determining the preset time period based on the operating temperature of the catalyst and the air flow rate comprises: and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow. The preset time length is determined according to the corresponding relation between the preset time length and the temperature and the air flow, so that the processing speed for determining the preset time length can be increased.
In the embodiment of the invention, under the condition of acquiring the detection request of the catalytic converter, the detection working condition is formed by controlling the rotating speed of the engine and the load of the generator; and under the detection working condition, detecting whether the catalyst is abnormal or not, so that the hybrid vehicle can accurately determine whether the catalyst is abnormal or not, and the detection of the catalyst is realized.
Second embodiment
Referring to fig. 2, an embodiment of the present invention provides a hybrid vehicle including an engine and a generator, and as shown in fig. 2, the hybrid vehicle 200 includes:
the control module 201 is used for forming a detection working condition by controlling the rotating speed of the engine and the load of the generator under the condition of acquiring a catalyst detection request;
a detection module 202 is configured to detect whether the catalyst is abnormal under the detection condition.
Optionally, the detection conditions are: the rotational speed of the engine is at a preset rotational speed and the load of the generator is at a preset load.
Optionally, as shown in fig. 3, the detecting module 202 includes:
an oxygen storage period acquisition unit 2021 for acquiring an oxygen storage period of the catalyst;
a determination unit 2022 for determining whether the catalyst is abnormal based on the oxygen storage period.
Optionally, as shown in fig. 4, the determining unit 2022 includes:
a comparison subunit 20221, configured to compare the oxygen storage duration with a preset duration;
a determination subunit 20222, configured to determine that the catalyst is abnormal if the oxygen storage time period is greater than or equal to a preset time period.
Alternatively, as shown in fig. 5, the oxygen storage period acquiring unit 2021 includes:
a first control subunit 20211 for controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio;
a second control subunit 20212, configured to control the air-fuel ratio to decrease to a second preset air-fuel ratio when the air-fuel ratio is at the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst increases to a first preset signal value;
a time length obtaining subunit 20213, configured to obtain an oxygen storage time length in a process in which the post-oxygen signal decreases to a second preset signal value when the air-fuel ratio is at the second preset air-fuel ratio.
Optionally, the oxygen storage time is: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time length between the time point when the air-fuel ratio is reduced to the second preset air-fuel ratio and the time point when the post-oxygen signal is reduced to the second preset signal value.
Optionally, as shown in fig. 6, the determining unit 2022 further includes:
a temperature and flow rate obtaining subunit 20223, configured to obtain an operating temperature and an air flow rate of the catalyst;
a preset time period determining subunit 20224 for determining the preset time period based on the operating temperature of the catalyst and the air flow rate.
Optionally, the preset duration determining subunit 20224 is specifically configured to:
and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow.
Alternatively, as shown in fig. 7, the hybrid vehicle 200 further includes:
a request obtaining module 203, configured to obtain the catalyst detection request if the hybrid vehicle meets a preset detection condition, where the preset detection condition includes:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor has no fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
The hybrid vehicle 200 provided in the embodiment of the present invention can implement each process implemented by the hybrid vehicle in the method embodiment of fig. 1, and achieve the same beneficial effects, and for avoiding repetition, the details are not repeated here.
Third embodiment
Referring to fig. 8, a hybrid vehicle 800 includes a memory 801, a processor 802, and a computer program stored on the memory 801 and executable on the processor 802, and in addition, the hybrid vehicle 800 is provided with an engine and a generator, and the engine is connected to the generator; the processor 802, when executing the program, implements:
under the condition that a catalyst detection request is obtained, a detection working condition is formed by controlling the rotating speed of the engine and the load of the generator;
and detecting whether the catalyst is abnormal under the detection working condition.
In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 802 and various circuits of memory represented by memory 801 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 802 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 802 in performing operations.
Optionally, the detection conditions are: the rotational speed of the engine is at a preset rotational speed and the load of the generator is at a preset load.
Optionally, the processor 802 further performs the detecting whether the catalyst is abnormal, including:
acquiring the oxygen storage duration of the catalyst;
determining whether the catalyst is abnormal based on the oxygen storage period.
Optionally, the processor 802 further executes the determining whether the catalyst is abnormal based on the oxygen storage period, including:
comparing the oxygen storage time with a preset time;
and if the oxygen storage duration is greater than or equal to a preset duration, determining that the catalyst is abnormal.
Optionally, the processor 802 further executes the acquiring of the oxygen storage time of the catalyst, including:
controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio;
under the condition that the air-fuel ratio is at the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst is increased to a first preset signal value, controlling the air-fuel ratio to be decreased to a second preset air-fuel ratio;
and acquiring the oxygen storage duration in the process that the rear oxygen signal is reduced to a second preset signal value under the condition that the air-fuel ratio is in the second preset air-fuel ratio.
Optionally, the oxygen storage time is as follows: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time period between the point in time when the air-fuel ratio falls to the second preset air-fuel ratio and the point in time when the post oxygen signal falls to the second preset signal value.
Optionally, before the comparing the oxygen storage time length with the preset time length, the processor 802 further performs:
acquiring the working temperature and the air flow of the catalyst;
the preset time period is determined based on an operating temperature of the catalyst and an air flow rate.
Optionally, the processor 802 further executes the determining the preset time period based on the operating temperature and the air flow of the catalyst, including:
and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow.
Optionally, the processor 802 further performs the steps before the adjusting the engine speed and the generator load in the case of obtaining the catalyst detection request, including:
if the hybrid electric vehicle meets preset detection conditions, acquiring the catalyst detection request, wherein the preset detection conditions comprise:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor has no fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
In addition, hybrid vehicle 800 also includes some functional modules that are not shown, and are not described in detail herein.
The hybrid vehicle 800 provided in the embodiment of the present invention can implement each process implemented by the hybrid vehicle in the method embodiment of fig. 1, and achieve the same beneficial effects, and for avoiding repetition, details are not repeated here.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned embodiment of the method for training an automatic driving model, and can achieve the same technical effect, and in order to avoid repetition, the detailed description is omitted here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, 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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for causing a hybrid vehicle to perform the method according to the embodiments of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. A catalyst detection method applied to a hybrid vehicle, the hybrid vehicle comprising an engine and a generator, the method comprising:
if the hybrid vehicle meets a preset detection condition, acquiring the catalyst detection request;
under the condition that a catalyst detection request is obtained, a detection working condition is formed by controlling the rotating speed of the engine and the load of the generator, and the detection working condition is as follows: the rotating speed of the engine is at a preset rotating speed and the load of the generator is at a preset load; the hybrid vehicle is provided with a driving motor, the driving motor drives the hybrid vehicle to run, and the catalyst is detected when the vehicle is in a non-idle state;
and detecting whether the catalyst is abnormal under the detection working condition.
2. The method of claim 1, wherein the detecting whether the catalyst is abnormal comprises:
acquiring the oxygen storage duration of the catalyst;
determining whether the catalyst is abnormal based on the oxygen storage period.
3. The method of claim 2, wherein the determining whether the catalyst is abnormal based on the oxygen storage period comprises:
comparing the oxygen storage time with a preset time;
and if the oxygen storage time is longer than or equal to the preset time, determining that the catalyst is abnormal.
4. The method of claim 2, wherein the obtaining the oxygen storage period of the catalyst comprises:
controlling the air-fuel ratio of the engine to rise to a first preset air-fuel ratio;
under the condition that the air-fuel ratio is at the first preset air-fuel ratio and the signal value of the post-oxygen signal of the catalyst is increased to a first preset signal value, controlling the air-fuel ratio to be decreased to a second preset air-fuel ratio;
and acquiring the oxygen storage duration of the process that the rear oxygen signal is reduced to a second preset signal value under the condition that the air-fuel ratio is at the second preset air-fuel ratio.
5. The method according to claim 4, wherein the oxygen storage period is: a time period between a time point when the post-oxygen signal rises to the first preset signal value and a time point when the post-oxygen signal falls to the second preset signal value; or the time period between the point in time when the air-fuel ratio falls to the second preset air-fuel ratio and the point in time when the post oxygen signal falls to the second preset signal value.
6. The method of claim 3, wherein before comparing the oxygen storage period to a preset period, further comprising:
acquiring the working temperature and the air flow of the catalyst;
the preset time period is determined based on an operating temperature of the catalyst and an air flow rate.
7. The method of claim 6, wherein the determining the preset period of time based on the operating temperature of the catalyst and the air flow rate comprises:
and determining the duration with the corresponding relation between the working temperature and the air flow of the catalyst as the preset duration according to the corresponding relation between the preset duration and the temperature and the air flow.
8. The method of claim 1, wherein the preset detection condition comprises:
the running time of the engine is greater than or equal to a first preset time;
the inlet air temperature is greater than or equal to a first preset temperature;
the water temperature is greater than or equal to a second preset temperature;
the air-fuel ratio is under closed-loop control;
the front oxygen sensor is not in fault;
the back oxygen sensor has no fault;
the fuel system has no fault;
the duration that the air inflow of the engine is continuously larger than the preset air inflow is larger than or equal to a second preset duration;
the estimated temperature of the catalyst is within a preset temperature range.
9. A hybrid vehicle including an engine and a generator, characterized by comprising:
the control module is used for acquiring a catalyst detection request if the hybrid vehicle meets a preset detection condition, and forming a detection working condition by controlling the rotating speed of the engine and the load of the generator under the condition of acquiring the catalyst detection request; wherein, the detection working condition is as follows: the rotating speed of the engine is at a preset rotating speed and the load of the generator is at a preset load; the engine is only used for driving the generator to generate power under the conditions that the engine is at a preset rotating speed and the generator is set to a preset load, the hybrid vehicle is also provided with a driving motor, the driving motor drives the hybrid vehicle to run, and the catalyst is detected when the vehicle is in a non-idling state;
and the detection module is used for detecting whether the catalyst is abnormal or not under the detection working condition.
10. The hybrid vehicle of claim 9, wherein the detection module includes:
an oxygen storage duration acquisition unit for acquiring an oxygen storage duration of the catalyst;
a determination unit that determines whether the catalyst is abnormal based on the oxygen storage period.
11. The hybrid vehicle according to claim 10, characterized in that the determination unit includes:
the comparison subunit is used for comparing the oxygen storage time length with a preset time length;
and the determining subunit is used for determining that the catalyst is abnormal if the oxygen storage time is longer than or equal to a preset time.
12. A hybrid vehicle, characterized by comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the detection method of a catalyst as claimed in any one of claims 1 to 8.
13. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method of detecting a catalyst according to any one of claims 1 to 8.
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