CN112576352B - Exhaust pipe leak detection method, system, engine controller and motor vehicle - Google Patents
Exhaust pipe leak detection method, system, engine controller and motor vehicle Download PDFInfo
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- CN112576352B CN112576352B CN202011378804.7A CN202011378804A CN112576352B CN 112576352 B CN112576352 B CN 112576352B CN 202011378804 A CN202011378804 A CN 202011378804A CN 112576352 B CN112576352 B CN 112576352B
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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
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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
- 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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to the technical field of vehicles, in particular to a method and a system for detecting air leakage of an exhaust pipe, an engine controller and a motor vehicle. The method for detecting the air leakage of the exhaust pipe comprises the following steps: determining the current state of the engine according to the ambient temperature and the temperature of the engine water, wherein the current state comprises the following steps: a cold state and a warm state; if the engine is in a cold state, triggering parking regeneration and timing, acquiring first time of the engine in a heating stage and first temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not; and if the engine is in a warm state, triggering parking regeneration and timing, acquiring second time of the engine in a heating stage and second temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air. Whether the exhaust pipe leaks can be effectively identified by comparing the duration of the Lof stage, the duration of the Dry stage and the time threshold value in the cold state and the warm state respectively.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a system for detecting air leakage of an exhaust pipe, an engine controller and a motor vehicle.
Background
In order to meet the requirement of new emission regulations on the quantity (PN) of particulate matter particles, a DPF device of a particulate filter needs to be additionally arranged at an exhaust pipe of the diesel engine in Tekyo Wu and China. Along with the operation of an engine, the trapped particulate matters in the particulate trap can be accumulated continuously, so that the phenomena of rising of exhaust back pressure of the engine, deterioration of fuel economy and the like are caused, and the particulate trap can be blocked in serious conditions, so that the particulate trap full of the trapped particulate matters needs to be regenerated to recover the particulate trapping function of the particulate trap. According to the market experience of the top tejing five diesel engine, one important reason that the regeneration is unsuccessful is that the temperature cannot be effectively raised due to the air leakage of the exhaust pipe, each regeneration mode cannot automatically jump, and the parking regeneration cannot be smoothly and automatically completed. In addition, the market service personnel can not effectively locate the reasons of the regeneration failure, so that the maintenance and troubleshooting are very difficult. At present, a visual observation method is generally adopted for monitoring whether the exhaust pipe leaks air, however, the air leakage amount of the engine under different operating conditions is different, visual evaluation results of different people are different, and whether the exhaust pipe leaks air or not can not be intuitively and clearly judged
In view of the foregoing, it is desirable to provide a method and a system for detecting exhaust pipe air leakage, an engine controller, and a motor vehicle, which can check whether an exhaust pipe is air-leaked, thereby reducing the difficulty of troubleshooting.
Disclosure of Invention
In order to solve the problems, the application provides a method and a system for detecting air leakage of an exhaust pipe, an engine controller and a motor vehicle.
On one hand, the application provides a detection method of exhaust pipe gas leakage, including the following steps:
determining a current state of the engine according to the ambient temperature and the engine water temperature, wherein the current state comprises: a cold state and a warm state;
if the engine is in the cold state, triggering parking regeneration and timing, acquiring first time of the engine in a heating stage and first temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not;
and if the engine is in the warm state, triggering parking regeneration and timing, acquiring second time of the engine in a heating stage and second temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air.
Further, the method for detecting exhaust pipe gas leakage as described above, where the parking regeneration is triggered and timed, a first time when the engine is in a first heating stage and a first temperature upstream of the oxidation catalytic converter are obtained, and whether the exhaust pipe is gas leakage is determined, includes:
triggering the parking regeneration of the cold machine and timing;
raising the temperature of the aftertreatment by controlling the opening of the air inlet throttle valve;
acquiring a first time when the engine is in a heating stage and a first temperature at the upstream of the oxidation type catalytic converter;
if the first time exceeds a first time threshold for the first stage of heating and the first temperature is less than a first temperature threshold upstream of the oxidation catalytic converter, the exhaust pipe leaks air.
Further, the method for detecting exhaust pipe gas leakage as described above, where the parking regeneration is triggered and timed, a second time when the engine is in the heating stage and a second temperature upstream of the oxidation catalytic converter are obtained, and whether the exhaust pipe gas leakage occurs is determined, includes:
acquiring a second time when the engine is in the heating stage and a second temperature at the upstream of the oxidation type catalytic converter;
and if the second time exceeds a second time threshold of the heating stage and the second temperature is lower than a second temperature threshold upstream of the oxidation-type catalytic converter, the exhaust pipe leaks air.
Further, according to the method for detecting exhaust pipe leakage, the current state of the engine is determined according to the ambient temperature and the temperature of the engine water, and the current state comprises the following steps: cold and warm states, including:
if the ambient temperature is greater than or equal to the ambient temperature threshold value and the water temperature of the engine is greater than or equal to the water temperature threshold value, the current state of the engine is a warm state;
and if the ambient temperature is greater than the ambient temperature threshold value and the water temperature of the engine is less than the water temperature threshold value, the current state of the engine is a cold state.
In a second aspect, the present application provides a system for detecting gas leakage of an exhaust pipe, comprising: a judging module and an executing module;
the judging module is used for determining the current state of the engine according to the ambient temperature and the temperature of the engine water, and the current state comprises the following steps: a cold state and a warm state; acquiring the first time when the engine is in a first heating stage and the first temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not; acquiring second time of the engine in a heating stage and second temperature of the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not;
and the execution module is used for triggering parking regeneration and timing.
Further, in the system for detecting exhaust pipe leakage as described above, the execution module is further configured to raise the temperature of the aftertreatment by controlling the opening of the intake throttle valve.
Further, in the system for detecting exhaust pipe gas leakage as described above, the determination module includes a data determination unit, and is specifically configured to determine that exhaust pipe gas leakage occurs if the first time exceeds a first time threshold of the first heating stage and the first temperature is lower than a first temperature threshold upstream of the oxidation-type catalytic converter; and if the second time exceeds a second time threshold of the heating stage and the second temperature is lower than a second temperature threshold upstream of the oxidation-type catalytic converter, the exhaust pipe leaks air.
Further, the system for detecting the exhaust pipe gas leakage as described above, the determination module further includes a data acquisition unit configured to acquire a first time when the engine is in the first heating stage and a first temperature upstream of the oxidation-type catalytic converter; a second time that the engine is in the warm-up phase and a second temperature upstream of the oxidation catalytic converter are obtained.
In a third aspect, the present application proposes an engine controller for executing the above-described exhaust pipe gas leakage detection method.
In a fourth aspect, the present application provides a motor vehicle comprising the engine controller described above.
The application has the advantages that: through the current state of confirming the engine, according to the current state of engine, after triggering regeneration, acquire the time and the oxidation type catalytic converter upstream temperature in different stages, according to the time of acquireing and the temperature in oxidation type catalytic converter upstream, judge whether the blast pipe leaks gas, whether the check blast pipe that can be simple convenient leaks gas to reduce the troubleshooting degree of difficulty.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to denote like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram illustrating the steps of a method for detecting the leakage of an exhaust pipe according to the present disclosure;
FIG. 2 is a schematic flow chart of a method for detecting an exhaust pipe leakage according to the present disclosure;
fig. 3 is a schematic diagram of a system for detecting air leakage of an exhaust pipe according to the present application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In a first aspect, according to an embodiment of the present application, a method for detecting an exhaust pipe air leakage is provided, as shown in fig. 1, including the following steps:
s101, determining the current state of the engine according to the ambient temperature and the temperature of the engine water, wherein the current state comprises the following steps: a cold state and a warm state;
s102, if the engine is in a cold state, triggering parking regeneration and timing, acquiring first time of the engine in a heating stage and first temperature of the upstream of an Oxidation catalytic converter (DOC), and judging whether an exhaust pipe leaks air or not;
s103, if the engine is in a warm state, triggering parking regeneration and timing, acquiring second time of the engine in a heating stage and second temperature of the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air.
Wherein, the first heating stage is Lof stage, and the second heating stage is Dry stage.
When the current state of the engine is determined according to the ambient temperature and the temperature of the engine water, the ambient temperature needs to be in a non-low temperature state (for example, the ambient temperature threshold is greater than or equal to 10 degrees or 20 degrees), and since the parking regeneration is started when the ambient temperature is in the low temperature state, the temperature can be rapidly increased, so that the state of the exhaust pipe cannot be accurately judged. The water temperature threshold may be 10 degrees or less.
Triggering parking regeneration and timing, acquiring the first time of the engine in a heating stage and the first temperature of the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not, wherein the method comprises the following steps: triggering the parking regeneration of the cold machine and timing; raising the temperature of the aftertreatment by controlling the opening of the air inlet throttle valve; acquiring a first time when the engine is in a heating stage and a first temperature at the upstream of the oxidation type catalytic converter; if the first time exceeds a first time threshold for the first stage of heating and the first temperature is below a first temperature threshold upstream of the oxidation catalytic converter, the exhaust pipe leaks air. The first time threshold for the first stage of heating is the calibrated maximum time for the Lof stage.
Triggering parking regeneration and timing, acquiring second time when the engine is in a heating stage and second temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not, wherein the method comprises the following steps: acquiring a second time when the engine is in the heating stage and a second temperature at the upstream of the oxidation type catalytic converter; if the second time exceeds a second time threshold for the heating phase and the second temperature is less than a second temperature threshold upstream of the oxidation catalytic converter, the exhaust pipe leaks air. The second time threshold for the heating phase is the calibrated maximum time for the Dry phase.
Determining the current state of the engine according to the ambient temperature and the temperature of the engine water, wherein the current state comprises the following steps: cold and warm states, including: if the ambient temperature is greater than or equal to the ambient temperature threshold value and the water temperature of the engine is greater than or equal to the water temperature threshold value, the current state of the engine is a warm-up state; and if the ambient temperature is less than the ambient temperature threshold value and the water temperature of the engine is greater than the water temperature threshold value, the current state of the engine is a cold state.
Whether the exhaust pipe leaks air can be simply judged through the temperature raising effect in the parking regeneration temperature raising stage. Whether the exhaust pipe leaks can be effectively identified by comparing the duration of the Lof stage, the duration of the Dry stage and the time threshold value in the cold state and the warm state respectively.
Embodiments of the examples of the present application will be further described with reference to fig. 2.
Firstly, the engine water temperature is compared with a set water temperature threshold value and the environment temperature is compared with a set environment temperature threshold value, and the engine is judged to be in a cold state or a warm state at the moment.
Triggering parking regeneration, respectively setting an engine running mode in a specific mode according to different states of an engine, monitoring the duration time of the temperature of each stage of aftertreatment reaching the set temperature, comparing the duration time with a time threshold, and judging that air leakage exists in an exhaust pipe if the duration time exceeds the time threshold, wherein the specific judgment method comprises the following steps:
as shown in fig. 2, firstly, the ambient temperature needs to be in a non-low temperature state, that is, the ambient temperature is greater than or equal to the ambient temperature threshold, and secondly, if the water temperature of the engine is greater than or equal to the water temperature threshold, the current state of the engine is a warm state; and if the water temperature of the engine is smaller than the water temperature threshold value, the current state of the engine is a cold state.
And for the engine in a cold state, triggering a parking regeneration function, starting timing, entering a cold parking regeneration Lof stage, and realizing aftertreatment temperature increase by controlling the opening of an air inlet throttle valve. According to product development experience, the longest time of the engine in the Lof stage under the normal temperature condition is set as a first time threshold, the duration time of the engine in the stage is set as the first time, if the first time exceeds the first time threshold and the upstream temperature of the oxidation type catalytic converter is still lower than the first temperature threshold of the oxidation type catalytic converter, the air leakage of the exhaust pipe can be judged, the air leakage indicating state of the exhaust pipe is set, and the air leakage fault of the exhaust pipe is reported.
For the engine in the warm state, because the engine is influenced by the heat preservation of the exhaust pipe and the like when the parking regeneration is triggered, the Lof stage has short duration, and whether the fault exists is not easy to find. Therefore, when the engine is in a warm state, the longest time of the Dry stage of the engine under the normal temperature condition is set as a second time threshold, the duration time of the Dry stage of the engine is set as a second time, if the second time exceeds the second time threshold and the upstream temperature of the chemical catalytic converter is still lower than the second temperature threshold of the upstream of the oxidation catalytic converter, the exhaust pipe is considered to be leaked, the exhaust pipe leakage indicating state is set, and the exhaust pipe leakage fault is reported.
In a second aspect, according to an embodiment of the present application, there is also provided a system for detecting an exhaust pipe gas leakage, as shown in fig. 3, including: a judging module 101 and an executing module 102.
The judging module 101 is configured to determine a current state of the engine according to the ambient temperature and the engine water temperature, where the current state includes: a cold state and a warm state; acquiring the first time when the engine is in a first heating stage and the first temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not; and acquiring a second time when the engine is in a heating stage and a second temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not. And the execution module 102 is used for triggering parking regeneration and timing.
And the execution module is also used for raising the temperature of the aftertreatment by controlling the opening of the air inlet throttle valve.
The judgment module comprises a data judgment unit, and is specifically used for judging the gas leakage of the exhaust pipe if the first time exceeds a first time threshold of the first heating stage and the first temperature is lower than a temperature threshold at the upstream of the oxidation type catalytic converter; if the second time exceeds a second time threshold for the heating phase and the second temperature is less than a temperature threshold upstream of the oxidation catalytic converter, the exhaust pipe leaks air.
The judging module further comprises a data acquiring unit, a first time when the engine is in a first heating stage and a first temperature at the upstream of the oxidation type catalytic converter are acquired; a second time that the engine is in the warm-up phase and a second temperature upstream of the oxidation catalytic converter are obtained.
In a third aspect, according to an embodiment of the present application, an engine controller is further provided for executing the above-mentioned exhaust pipe gas leakage detection method.
In a fourth aspect, according to an embodiment of the present application, there is also provided a motor vehicle including the engine controller described above.
According to the method, the current state of the engine is determined, the time and the upstream temperature of the oxidation type catalytic converter in different stages are obtained after regeneration is triggered according to the current state of the engine, whether the exhaust pipe leaks air or not is judged according to the obtained time and the upstream temperature of the oxidation type catalytic converter, whether the exhaust pipe leaks air or not can be simply and conveniently checked, and therefore the difficulty in troubleshooting is reduced.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A method for detecting air leakage of an exhaust pipe is characterized by comprising the following steps:
determining a current state of the engine according to the ambient temperature and the engine water temperature, wherein the current state comprises: a cold state and a warm state;
if the engine is in the cold state, triggering parking regeneration and timing, acquiring first time of the engine in a heating stage and first temperature at the upstream of the oxidation type catalytic converter, and if the first time exceeds a first time threshold of the heating stage and the first temperature is lower than a first temperature threshold at the upstream of the oxidation type catalytic converter, leaking gas from the exhaust pipe;
and if the engine is in the warm state, triggering parking regeneration and timing, and acquiring second time of the engine in the heating stage and second temperature of the upstream of the oxidation type catalytic converter, and if the second time exceeds a second time threshold of the heating stage and the second temperature is lower than a second temperature threshold of the upstream of the oxidation type catalytic converter, leaking gas from the exhaust pipe.
2. The method for detecting exhaust pipe leakage according to claim 1, wherein the triggering parking regeneration and timing to obtain a first time when the engine is in a heating stage and a first temperature upstream of the oxidation catalytic converter comprises:
triggering the parking regeneration of the cold machine and timing;
raising the temperature of the aftertreatment by controlling the opening of the air inlet throttle valve;
a first time that the engine is in the warm-up phase and a first temperature upstream of the oxidation catalytic converter are obtained.
3. The method for detecting exhaust pipe air leakage according to claim 1, wherein the current state of the engine is determined according to the ambient temperature and the engine water temperature, and the current state includes: cold and warm states, including:
if the ambient temperature is greater than or equal to the ambient temperature threshold value and the water temperature of the engine is greater than or equal to the water temperature threshold value, the current state of the engine is a warm state;
and if the ambient temperature is greater than the ambient temperature threshold value and the water temperature of the engine is less than the water temperature threshold value, the current state of the engine is a cold state.
4. An exhaust pipe gas leakage detection system for performing the exhaust pipe gas leakage detection method according to any one of claims 1 to 3, the exhaust pipe gas leakage detection system comprising: a judging module and an executing module;
the judging module is used for determining the current state of the engine according to the ambient temperature and the temperature of the engine water, and the current state comprises the following steps: a cold state and a warm state; acquiring the first time when the engine is in a first heating stage and the first temperature at the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not; acquiring second time of the engine in a heating stage and second temperature of the upstream of the oxidation type catalytic converter, and judging whether the exhaust pipe leaks air or not;
and the execution module is used for triggering parking regeneration and timing.
5. The system of claim 4, wherein the execution module is further configured to warm the aftertreatment by controlling an opening of an intake throttle valve.
6. The system for detecting the exhaust pipe gas leakage according to claim 4, wherein the judging module comprises a data judging unit, and is specifically configured to determine that the exhaust pipe gas leakage occurs if the first time exceeds a first time threshold of a first heating stage and the first temperature is lower than a first temperature threshold upstream of the oxidation-type catalytic converter; and if the second time exceeds a second time threshold of the heating stage and the second temperature is lower than a second temperature threshold upstream of the oxidation-type catalytic converter, the exhaust pipe leaks air.
7. The system for detecting exhaust pipe gas leakage according to claim 6, characterized in that the determination module further comprises a data acquisition unit for acquiring a first time at which the engine is in the first stage of heating and a first temperature upstream of the oxidation-type catalytic converter; a second time that the engine is in the warm-up phase and a second temperature upstream of the oxidation catalytic converter are obtained.
8. An engine controller characterized by being configured to execute the exhaust pipe air leakage detection method according to any one of claims 1 to 3.
9. A motor vehicle characterized by comprising the engine controller according to claim 8.
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| CN114577399B (en) * | 2022-01-18 | 2024-07-19 | 潍柴动力股份有限公司 | Engine air leakage detection method and detection device |
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| CN108104926A (en) * | 2016-11-25 | 2018-06-01 | 贵州北斗环科工程有限公司 | Exhaust gas from diesel vehicle monitoring, diagnosis and the electronic control unit repaired |
| EP3575587B1 (en) * | 2018-05-31 | 2024-05-22 | Stoneridge, Inc. | Evaporative emissions control system leak check module including first and second solenoid valves |
| CN111307463B (en) * | 2018-12-11 | 2022-01-21 | 潍柴动力股份有限公司 | Air leakage detection method and device for engine exhaust system |
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| CN104165967A (en) * | 2013-05-17 | 2014-11-26 | 公益财团法人日本汽车运输技术协会 | Exhaust gas analysis system and exhaust gas leakage detection method |
| CN104594982A (en) * | 2015-01-16 | 2015-05-06 | 东风商用车有限公司 | Auxiliary regeneration device of vehicle particle catcher |
| US9551262B1 (en) * | 2015-10-13 | 2017-01-24 | Ford Global Technologies, Llc | Method and system for particulate filter leakage detection |
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