阅读说明：本技术 发动机碳氢泄漏检测方法及系统、处理装置及存储介质 (Engine hydrocarbon leakage detection method and system, processing device and storage medium ) 是由 李达 胡佳富 孟凡举 于 2020-04-09 设计创作，主要内容包括：本发明提供一种发动机碳氢泄露的检测方法及系统、处理装置及存储介质,通过检测发动机的运行模式和工况,当所述运行模式为非再生运行模式,且所述工况处于稳定状态时,检测所述发动机的氧化型催化转化器出口的温度并进行判断,若判断出所述氧化型催化转化器出口的温度异常升高,则确定所述发动机碳氢异常泄露。本发明能够提高发动机碳氢泄漏判断的准确性和及时性。(The invention provides a detection method and a system for hydrocarbon leakage of an engine, a processing device and a storage medium. The method and the device can improve the accuracy and timeliness of judging the hydrocarbon leakage of the engine.)

1. A detection method for hydrocarbon leakage of an engine is characterized by comprising the following steps:

detecting the running mode and working condition of the engine;

when the operation mode is a non-regeneration operation mode and the working condition is in a stable state, detecting the temperature of an outlet of an oxidation type catalytic converter of the engine and judging;

and if the temperature of the outlet of the oxidation type catalytic converter is judged to be abnormally increased, determining that the engine has abnormal hydrocarbon leakage.

2. The detection method according to claim 1, wherein detecting and determining the temperature at an outlet of an oxidation-type catalytic converter of the engine includes:

detecting a temperature of an oxidation-type catalytic converter inlet of the engine;

and judging whether the difference value between the temperature of the outlet of the oxidation type catalytic converter and the temperature of the inlet of the oxidation type catalytic converter exceeds a preset limit value, if so, determining that the temperature of the outlet of the oxidation type catalytic converter is abnormally increased.

3. The sensing method of claim 1, wherein sensing the operating mode and condition of the engine comprises:

monitoring the value and fluctuations of the exhaust gas flow over a specified time;

and if the exhaust gas flow value is larger than a preset flow value and the fluctuation of the exhaust gas flow is smaller than a preset fluctuation in the specified time, determining that the working condition of the engine is in a stable state.

4. The detection method according to claim 1, wherein after determining that the engine hydrocarbon is abnormally leaked if it is determined that the temperature of the outlet of the oxidation catalytic converter is abnormally increased, the detection method further comprises:

detecting oil pressure, fuel consumption and/or an out-of-cylinder hydrocarbon injection system pressure of the engine;

and determining the fault cause of the engine according to the working condition of the engine and the oil pressure, the fuel consumption and/or the pressure of the out-of-cylinder hydrocarbon injection system of the engine.

5. The detection method according to claim 1 or 4,

when the hydrocarbon of the engine is determined to be abnormally leaked, sending out first alarm information;

and when the fault reason of the abnormal hydrocarbon leakage of the engine is determined, sending second alarm information.

6. A system for detecting hydrocarbon leakage from an engine, comprising:

the detection module is used for detecting the running mode and the working condition of the engine;

the judging module is used for detecting and judging the temperature of an outlet of an oxidation type catalytic converter of the engine when the operation mode is a non-regeneration operation mode and the working condition is in a stable state; and generating a hydrocarbon abnormal leakage instruction when judging that the temperature of the outlet of the oxidation type catalytic converter is abnormally increased.

7. The detection system of claim 6, further comprising a fault cause diagnostic module, the fault cause diagnostic module comprising:

the parameter detection unit is used for detecting the oil pressure, the fuel consumption and/or the pressure of an out-of-cylinder hydrocarbon injection system of the engine;

and the fault reason determining unit is used for determining the fault reason of the engine according to the working condition of the engine and the oil pressure, the fuel consumption and/or the pressure of the out-of-cylinder hydrocarbon injection system of the engine and generating a fault reason determining instruction.

8. The detection system of claim 7, further comprising:

and the alarm module is used for sending first alarm information according to the hydrocarbon abnormal leakage instruction and/or sending second alarm information according to the fault reason determining instruction.

9. A processing apparatus comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, the computer program, when executed by the processor, performing the steps of the method of any of claims 1-5.

10. A storage medium having stored thereon a computer program for implementing the steps of the method according to any one of claims 1 to 5.

Technical Field

The invention belongs to the technical field of engines, and particularly relates to a method and a system for detecting hydrocarbon leakage of an engine, a storage medium and a processing device.

Background

With the upgrading of vehicle emission regulations, diesel engines gradually adopt aftertreatment technologies with DOC, such as DOC-DPF aftertreatment systems adopted by the fifth diesel engine in China and DOC-DPF-SCR aftertreatment systems adopted by the sixth diesel engine in China. The DOC is a short name for an Oxidation catalytic converter (Diesel Oxidation Catalyst), and is installed in an engine exhaust pipeline, and can oxidize Hydrocarbons (HC) flowing from an engine end, so that emission of exhaust pollutants can be effectively reduced, and necessary heat can be provided for a rear-end aftertreatment system.

The aftertreatment system at the rear end of the DOC includes Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR), and other systems, which all have required high temperature limit values, and if the temperature exceeds the limit value, the system may be damaged.

HC flowing into the DOC system from the engine end is sometimes necessary, such as the HC flow provided for DPF regeneration. However, sometimes this is caused by engine failure, such as: 1. HC leakage is caused by engine supercharger or valve oil leakage. The DOC outlet temperature is abnormally increased, even the DPF and the SCR are burnt, engine oil is combusted to generate a large amount of ash which is remained in the DPF, the carbon accumulation capacity of the DPF is reduced, and obvious deviation occurs between the carbon accumulation capacity model and the DPF; meanwhile, the engine oil leakage can also cause other severe problems in the operation of the engine; 2. injector failure results in HC leakage. Not only can the oil consumption be increased, but also the DOC outlet temperature can be abnormally increased, and the DPF and the SCR can be burnt; 3. a malfunction of the ex-cylinder HC injection system results in HC leakage. The out-of-cylinder HC injection system generally provides the necessary HC flow for aftertreatment regeneration, but if the failure causes HC leakage, the oil consumption is also increased, the DOC outlet temperature is abnormally increased, the DPF and the SCR can be burnt, and the like.

In the prior art, the modes of aftertreatment temperature high-temperature alarm, engine oil pressure alarm and the like are only used generally, and the engine is reminded of reducing HC flow during aftertreatment regeneration or limiting the rotating speed or load of the engine. The prior art cannot detect or severely delay detection for the problem of abnormal HC flow into the DOC due to engine failure.

Disclosure of Invention

The invention provides a method and a system for detecting hydrocarbon leakage of an engine, a storage medium and a processing device, which can accurately and timely judge the occurrence and leakage positions of abnormal hydrocarbon leakage of the engine.

In a first aspect, the present invention provides a method for detecting hydrocarbon leakage of an engine, including:

detecting the running mode and working condition of the engine;

when the operation mode is a non-regeneration operation mode and the working condition is in a stable state, detecting the temperature of an outlet of an oxidation type catalytic converter of the engine and judging;

and if the temperature of the outlet of the oxidation type catalytic converter is judged to be abnormally increased, determining that the engine has abnormal hydrocarbon leakage.

Further, detecting and determining a temperature at an outlet of an oxidation catalytic converter of the engine includes:

detecting a temperature of an oxidation-type catalytic converter inlet of the engine;

and judging whether the difference value between the temperature of the outlet of the oxidation type catalytic converter and the temperature of the inlet of the oxidation type catalytic converter exceeds a preset limit value, if so, determining that the temperature of the outlet of the oxidation type catalytic converter is abnormally increased.

Further, detecting the operating mode and condition of the engine includes:

monitoring the value and fluctuations of the exhaust gas flow over a specified time;

and if the exhaust gas flow value is larger than a preset flow value and the fluctuation of the exhaust gas flow is smaller than a preset fluctuation in the specified time, determining that the working condition of the engine is in a stable state.

Further, after determining that the engine hydrocarbon is abnormally leaked if it is determined that the temperature at the outlet of the oxidation-type catalytic converter is abnormally increased, the method further includes:

detecting oil pressure, fuel consumption and/or an out-of-cylinder hydrocarbon injection system pressure of the engine;

and determining the fault cause of the engine according to the working condition of the engine and the oil pressure, the fuel consumption and/or the pressure of the out-of-cylinder hydrocarbon injection system of the engine.

Further, when the hydrocarbon of the engine is determined to be abnormally leaked, first alarm information is sent out;

and when the fault reason of the abnormal hydrocarbon leakage of the engine is determined, sending second alarm information.

In a second aspect, the present invention further provides a system for detecting hydrocarbon leakage of an engine, including:

the detection module is used for detecting the running mode and the working condition of the engine;

the judging module is used for detecting and judging the temperature of an outlet of an oxidation type catalytic converter of the engine when the operation mode is a non-regeneration operation mode and the working condition is in a stable state; and generating a hydrocarbon abnormal leakage instruction when judging that the temperature of the outlet of the oxidation type catalytic converter is abnormally increased.

Still further, the detection system further comprises a fault cause diagnosis module, which comprises:

the parameter detection unit is used for detecting the oil pressure, the fuel consumption and/or the pressure of an out-of-cylinder hydrocarbon injection system of the engine;

and the fault reason determining unit is used for determining the fault reason of the engine according to the working condition of the engine and the oil pressure, the fuel consumption and/or the pressure of the out-of-cylinder hydrocarbon injection system of the engine and generating a fault reason determining instruction.

Still further, still include:

and the alarm module is used for sending first alarm information according to the hydrocarbon abnormal leakage instruction and/or sending second alarm information according to the fault reason determining instruction.

In a third aspect, the present invention also provides a processing apparatus, comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and the computer program, when executed by the processor, implements the steps of the method according to the first aspect.

In a fourth aspect, the present invention further provides a storage medium having a computer program stored thereon for implementing the steps of the method of the first aspect.

The invention provides a detection method and a system for engine hydrocarbon leakage, a storage medium and a processing device, which at least have the following technical effects:

whether the temperature of the outlet of the oxidation type catalytic converter is abnormally increased or not under the non-regeneration working mode and the stable working condition of the engine is judged to determine whether the engine abnormally leaks the hydrocarbon or not, so that the accuracy and the timeliness of judging the hydrocarbon leakage of the engine can be improved, and serious problems such as burnout of an aftertreatment system and the like are prevented. And the position of the abnormal hydrocarbon leakage is judged by using the relevant working condition parameters of the engine, so that a user is reminded of reporting the leakage position while the abnormal hydrocarbon leakage occurs, and convenience is brought to the treatment of maintainers.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a flow chart of a method for detecting hydrocarbon leakage in an engine according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for detecting hydrocarbon leakage of an engine according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a system for detecting hydrocarbon leakage in an engine according to a third embodiment of the present invention;

fig. 4 is a block diagram of a detection system for hydrocarbon leakage of an engine according to a fourth 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The embodiment provides a method for detecting hydrocarbon leakage of an engine, as shown in fig. 1, comprising the following steps:

step S1, detecting the running mode of the engine;

step S2, judging whether the operation mode is a non-regeneration operation mode, if yes, entering step S3, if not, returning to step S1;

step S3, detecting the working condition of the engine;

step S4, judging whether the working condition is in a stable state, if so, entering step S5, otherwise, returning to step S3;

step S5, detecting the temperature of the DOC outlet of the engine;

step S6, judging whether the temperature of the DOC outlet is abnormally increased, if so, determining that HC abnormal leakage occurs, and entering step S7; if not, returning to the step S5;

and step S7, sending alarm information.

The non-regenerative operation mode is a mode in which the engine is not operated in a regenerative mode. The operating condition of the engine refers to the operating state of the engine under conditions directly related to its behavior. The method limits the operation mode of the engine to be only a non-regenerative operation mode, and has no limitation on the working condition, and the working condition can be any working condition of normal operation, such as partial load, full load and the like.

In some embodiments, whether the operating condition is in a steady state is determined by monitoring the value of the exhaust gas flow and fluctuations in the exhaust gas flow. A time period T may be preset, and if the value of the exhaust gas flow is greater than the set value a in the time period T and the fluctuation of the exhaust gas flow is less than the set value B in the time period T, the operating condition is considered to be in a steady state. The value of the exhaust gas flow rate may be a value at a certain time or may be a total value of a plurality of times. The value of the exhaust gas flow is greater than the set value A in the time period T, and can be any time or a designated time in the time period T; the total value of the exhaust gas flow rate may be larger than the set value a in a predetermined time period T, which may be the time period T. The fluctuation of the exhaust gas flow rate can be reflected on the change of the value of the exhaust gas flow rate, a reference value can be preset, and whether the difference value between the value of the exhaust gas flow rate at any time or at a specified time and the reference value in the time period T is smaller than a set value B or not is judged; it is also possible to provide a section [ B1, B2], determine whether the value of the exhaust gas flow rate is in the section [ B1, B2] during the time period T, and if so, indicate that the fluctuation of the exhaust gas flow rate is less than B' ═ B2-B1.

Preferably, whether the temperature of the DOC outlet is abnormally increased is judged, and the judgment is realized by comparing the temperature of the DOC outlet with the temperature of the DOC inlet. For example, when the difference between the DOC outlet temperature and the DOC inlet temperature exceeds the predetermined limit M, the DOC outlet temperature is abnormally increased. In some embodiments, the DOC outlet temperature may also be directly compared to a set limit. The predetermined limit value M needs to be determined through test detection, and the initial value can be set to 100

The numbering of steps S1-S7 is exemplary rather than specifying the order in which the steps are performed, such as by detecting engine operating conditions and then operating mode, or by detecting simultaneously, all determinations may be made sequentially or simultaneously.

Example two

The present embodiment provides another method for detecting hydrocarbon leakage of an engine, as shown in fig. 2, after steps S1-S7 in the first embodiment, the following steps are further performed:

step S8, detecting the oil pressure of the engine;

step S9, judging whether the deviation between the engine oil pressure and the engine oil pressure set based on the engine working condition exceeds a first set value, if so, obtaining that the fault reason is engine oil leakage, and entering step S14; if not, go to step S10;

step S10, detecting the fuel consumption of the engine;

step S11, judging whether the deviation between the fuel consumption and the fuel consumption set based on the working condition of the engine exceeds a second set value, if so, obtaining the fault reason of fuel injector leakage or HC injection system leakage, and entering step S14; if not, go to step S12;

step S12, detecting an out-of-cylinder HC injection system pressure of the engine;

step S13, judging whether the deviation between the pressure of the HC injection system outside the cylinder and the pressure of the HC injection system set based on the working condition of the engine exceeds a third set value, if so, obtaining the fault reason that the HC injection system leaks, and entering the step S14; if not, ending;

and step S14, sending alarm information.

The engine oil pressure, the fuel consumption and the pressure of the HC injection system set based on the engine working conditions can have a plurality of values respectively corresponding to different working conditions, and which value is specifically selected as a comparison object needs to be determined according to the detected working conditions. The first set value, the second set value and the third set value are determined through experimental verification, and can be initially set to 50kPa, 5g/sec and 2bar respectively.

In some embodiments, the engine oil pressure, fuel consumption, and the out-of-cylinder HC injection system pressure may also be directly compared to the first limit, the second limit, and the third limit, respectively. The limit value here is different from the above-mentioned set value and needs to be determined by experiment.

The different fault causes obtained from the steps S8-S13 correspond to the step S14 to send different alarm signals, and can be distinguished through different sound and light signals.

One of ordinary skill in the art will appreciate that the numbering of steps S8-S14 is exemplary and does not dictate the order in which the steps are performed. That is, there is no strict sequence between the above steps, as long as it can be determined which failure cause is described above.

EXAMPLE III

The embodiment provides a detection system 300 for hydrocarbon leakage of an engine, which comprises a detection module 301, a judgment module 302 and an alarm module 303, as shown in FIG. 3.

The detection module 301 is used to detect the operating mode and condition of the engine. The judging module 302 is configured to detect and judge a temperature of an outlet of an oxidation-type catalytic converter of the engine when the operation mode is a non-regenerative operation mode and a working condition is in a stable state, and generate an HC abnormal leakage instruction when it is judged that the temperature of the outlet of the DOC is abnormally increased. The alarm module 303 is configured to send alarm information according to the HC abnormal leakage instruction.

In particular, the detection module 301 may include speed sensors, power sensors, oxygen sensors, etc. for detecting operating modes and conditions.

In some embodiments, the determination module 302 further includes a temperature detection unit 3021 and a determination unit 3022.

The temperature detection unit 3021 is used to detect the temperature at the outlet and the temperature at the inlet of the oxidation-type catalytic converter of the engine. The determination unit 3022 is configured to determine whether the operation mode of the engine is a non-regenerative operation mode and whether the operating condition is in a steady state, if so, control the temperature detection unit 3021 to detect the temperature, determine whether a difference between the temperature at the outlet of the oxidation catalytic converter and the temperature at the inlet of the oxidation catalytic converter exceeds a predetermined limit, and if so, determine that the temperature at the outlet of the oxidation catalytic converter is abnormally increased to generate an HC abnormal leakage instruction.

Specifically, the temperature detection unit 3021 may include one or more temperature sensors. The judging unit 3022 may be implemented in the form of a comparator, a peripheral circuit thereof, an integrated chip, a programmable logic device, or the like, and may mainly implement a comparison function.

In some embodiments, the detection module 301 detects the operating condition by detecting an exhaust gas flow, which may include a gas sensor that detects the exhaust gas flow. The determination unit 3022 in the determination module 302 further determines whether the value of the exhaust gas flow rate detected by the detection module 301 is greater than a preset flow rate value within a specified time and whether the fluctuation of the exhaust gas flow rate is less than a preset fluctuation within a specified time, and if so, confirms that the operating condition of the engine is in a steady state.

Example four

The present embodiment provides a detection system 400 for engine hydrocarbon leakage, as shown in fig. 4, on the basis of the third embodiment, a fault cause diagnosis module 402 is further included to implement detection of a fault location.

Preferably, the fault cause diagnosis module 402 includes a parameter detection unit 4021 and a fault cause determination unit 4022. The parameter detecting unit 4021 is configured to detect an oil pressure, a fuel consumption amount, and/or an out-cylinder hydrocarbon injection system pressure of the engine. The failure cause determining unit 4022 is configured to determine a failure cause of the engine according to the operating condition of the engine and the oil pressure, the fuel consumption, and/or the pressure of the out-of-cylinder hydrocarbon injection system of the engine detected by the parameter detecting unit 4021, and generate a failure cause determination instruction.

Specifically, the fault cause determining unit 4022 compares the engine oil pressure with an engine oil pressure set based on the engine operating condition, determines whether a deviation between the engine oil pressure and the engine oil pressure exceeds a first set value, and generates an engine oil leakage fault instruction if the deviation exceeds the first set value; comparing the fuel consumption with fuel consumption set based on the working condition of the engine, judging whether the deviation of the fuel consumption and the fuel consumption exceeds a second set value, and if so, generating a fuel injector leakage fault instruction or an HC injection system leakage fault instruction; and comparing the pressure of the HC injection system outside the cylinder with the pressure of the HC injection system set based on the working condition of the engine, judging whether the deviation of the pressure of the HC injection system outside the cylinder and the pressure of the HC injection system exceeds a third set value, and if so, generating a leakage fault instruction of the HC injection system. The failure cause determination unit 4022 may implement diagnosis of one or more failure causes as described above according to actual needs.

In this embodiment, the alarm module 303 is further configured to receive the fault cause determination instruction generated by the fault cause diagnosis module 402 and send alarm information. Specifically, the alarm module 303 sends out a prompting message according to the HC abnormal leakage instruction, sends out a first warning message according to the engine oil leakage fault instruction, sends out a second warning message according to the fuel injector leakage fault instruction, and sends out a third warning message according to the HC injection system leakage fault instruction. The alarm module 303 may be implemented in the form of an alarm, an indicator light, a horn, or the like. Different warning messages may correspond to different decibel and timbre sound signals, and/or different colour light signals.

EXAMPLE five

The present embodiment provides a processing apparatus, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the computer program implements the steps of the method according to the first embodiment and/or the second embodiment when executed by the processor.

The processor may be configured to perform all or a portion of the steps of the engine hydrocarbon leak detection method as described in the previous embodiments. The Processor may be an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components.

The memory is used to store various types of data to support the operation of the processing device, and these data may include, for example, instructions for any application or method operating on the processing device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk.

EXAMPLE six

The present embodiment provides a storage medium on which a computer program implementing the steps of the method described in the first and/or second embodiment is stored.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.