CN115217597B - Secondary air control valve fault diagnosis method, device and system and vehicle - Google Patents

Secondary air control valve fault diagnosis method, device and system and vehicle Download PDF

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Publication number
CN115217597B
CN115217597B CN202210141953.4A CN202210141953A CN115217597B CN 115217597 B CN115217597 B CN 115217597B CN 202210141953 A CN202210141953 A CN 202210141953A CN 115217597 B CN115217597 B CN 115217597B
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China
Prior art keywords
air pressure
control valve
value
pressure value
preset
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CN202210141953.4A
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CN115217597A (en
Inventor
张喜岗
董战力
彭煌华
赫康
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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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
    • 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
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The application is suitable for the technical field of vehicles, and provides a fault diagnosis method, device and system for a secondary air control valve and a vehicle. And then, after a first control instruction is sent to the control valve, acquiring a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve, wherein the first control instruction is used for indicating the control valve to be opened. And after a second control instruction is sent to the control valve, acquiring a second air pressure value at a preset position, wherein the second control instruction is used for indicating the control valve to be closed. And comparing the absolute value of the difference value between the first air pressure value and the second air pressure value with a target threshold value, and when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, indicating that the control valve fails, and sending first warning information for indicating that the control valve fails at the moment to prompt a driver that the control valve fails.

Description

Secondary air control valve fault diagnosis method, device and system and vehicle
Technical Field
The application belongs to the technical field of vehicles, and particularly relates to a secondary air control valve fault diagnosis method, device and system and a vehicle.
Background
The diagnostic content of motorcycle euro-wu regulations has increased a lot of requirements compared with euro-wu, wherein the diagnostic requirement of "device operation/device presence" is newly added to devices such as carbon tanks, secondary air systems and the like. Secondary air can be classified into an active pump type and an passive pulse type in terms of injection. An active pump is one in which an air pump is present and is actively turned on to inject a volume of air as desired. The pulsed mode is to draw in a certain amount of air at the negative pressure of the exhaust gas according to the pulsation of the exhaust gas. Secondary air is an important emission reduction technology applied to motorcycles, has become a mainstream mature technology, and is generally in the form of an impulse. The essence of the secondary air injection system is to introduce a certain amount of fresh air into the exhaust pipe or the three-way catalytic converter, so that harmful gases (CO, HC) in the exhaust gas are further combusted with the air to further reduce the emission of harmful substances. The secondary air injection system can reduce HC emission when the engine is cold started, and can shorten the heating time of the oxygen sensor, so that the engine control module can enter the air-fuel ratio closed-loop control process as soon as possible.
Because the secondary air is introduced into fresh air at the exhaust side, the exhaust with high back pressure can flow back into the secondary air pipeline, so that the secondary control valve has a severe working environment and is easy to break down. The secondary air valve belongs to a mechanical valve, and carbon deposition and rust phenomena and the like are easy to occur, which can cause that a secondary air valve core and a base cannot keep sealing, and secondary air control accuracy is affected. The motorcycle euro-wu emission regulations require the monitoring of the failure of the secondary air control valve, and in order to meet this monitoring requirement, a corresponding diagnostic scheme must be developed.
At present, aiming at the diagnosis scheme of the secondary air control valve of the existing motorcycle, the diagnosis scheme is generally based on an oxygen sensor, the diagnosis can be started only after the oxygen sensor is fully heated during diagnosis, the secondary air system mainly works when the engine is cold started, and at the moment, the oxygen sensor cannot reach the working temperature, so that the diagnosis of the control valve cannot be performed when the engine is cold started.
Disclosure of Invention
The embodiment of the application provides a secondary air control valve fault diagnosis method, device and system and a vehicle, which can solve the problem that the control valve cannot be diagnosed during cold start of an engine.
In a first aspect, an embodiment of the present application provides a secondary air control valve failure diagnosis method, including:
controlling an engine to maintain the current rotating speed, and determining a target threshold according to the current rotating speed of the engine;
after a first control instruction is sent to a control valve, a first air pressure value of a preset position in a pipeline between the control valve and a one-way valve is obtained, wherein the first control instruction is used for indicating the control valve to be opened;
after a second control instruction is sent to the control valve, a second air pressure value of the preset position is obtained, wherein the second control instruction is used for indicating the control valve to be closed;
and when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, sending first warning information, wherein the first warning information is used for representing that the control valve fails.
In a possible implementation manner of the first aspect, after the sending the first warning information when the absolute value of the difference between the first air pressure value and the second air pressure value is less than or equal to the target threshold value, the method further includes:
after the first control instruction is sent to the control valve, acquiring a plurality of air pressure values of the preset position in a first preset time, selecting the minimum value from the plurality of air pressure values, and recording the minimum value as a third air pressure value;
and when the third air pressure value is larger than the first preset air pressure value, sending second warning information, wherein the second warning information is used for representing that the control valve has a normally closed fault.
In a possible implementation manner of the first aspect, after the sending the first warning information when the absolute value of the difference between the first air pressure value and the second air pressure value is less than or equal to the target threshold value, the method further includes:
after the second control instruction is sent to the control valve, acquiring a plurality of air pressure values of the preset position in a second preset time, selecting the minimum value from the plurality of air pressure values, and recording the minimum value as a fourth air pressure value;
and when the fourth air pressure value is smaller than a second preset air pressure value, sending third warning information, wherein the third warning information is used for representing that the control valve has a normally open fault.
In a possible implementation manner of the first aspect, the method further includes:
acquiring a plurality of groups of corresponding first rotating speeds and first thresholds, wherein the first rotating speeds are the rotating speeds of the engine, the first thresholds are smaller than first standard thresholds, and the first standard thresholds are absolute values of air pressure values of preset positions when the control valve is in an open state and air pressure value differences of the preset positions when the control valve is in a closed state when the rotating speeds of the engine are the first rotating speeds;
correlating and storing the first rotational speed and the first threshold value in each group;
the determining a target threshold according to the current rotation speed of the engine comprises the following steps:
searching a first rotating speed closest to the current rotating speed from the plurality of first rotating speeds, and recording the first rotating speed as a target rotating speed;
and searching a first threshold value associated with the target rotating speed from the plurality of first threshold values, and recording the first threshold value as the target threshold value.
In a possible implementation manner of the first aspect, after the sending a first control instruction to the control valve, obtaining a first air pressure value of a preset position in a pipeline between the control valve and the check valve includes:
after the first control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the first air pressure value.
In a possible implementation manner of the first aspect, after the sending a second control instruction to the control valve, obtaining a second air pressure value of the preset position includes:
after the second control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the second air pressure value.
In a second aspect, an embodiment of the present application provides a secondary air control valve failure diagnosis apparatus including:
the target threshold determining module is used for controlling the engine to maintain the current rotating speed and determining a target threshold according to the current rotating speed of the engine;
the first air pressure value determining module is used for acquiring a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve after sending a first control instruction to the control valve, wherein the first control instruction is used for indicating the control valve to be opened;
the second air pressure value determining module is used for acquiring a second air pressure value of the preset position after sending a second control instruction to the control valve, wherein the second control instruction is used for indicating the control valve to be closed;
and the first warning information sending module is used for sending first warning information when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, wherein the first warning information is used for representing that the control valve fails.
In a third aspect, an embodiment of the present application provides a secondary air control valve failure diagnosis system, including an air pressure sensor and a controller, where the controller is electrically connected to the air pressure sensor and the control valve, respectively, the air pressure sensor is installed at a preset position in a pipeline between the control valve and the check valve, and is used to collect an air pressure value at the preset position, and the controller is used to execute the method of any one of the first aspects.
In a fourth aspect, an embodiment of the application provides a vehicle including the secondary air control valve failure diagnosis system of the third aspect.
In a fifth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the method of any one of the first aspects.
In a sixth aspect, an embodiment of the application provides a computer program product for, when run on a terminal device, causing the terminal device to perform the method of any of the first aspects described above.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
in the cold start process of the engine, the engine is controlled to maintain the current rotation speed, so that the rotation speed of the engine is stable, and a target threshold value is determined according to the current rotation speed of the engine. And then, after a first control instruction is sent to the control valve, acquiring a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve, wherein the first control instruction is used for indicating the control valve to be opened. And after a second control instruction is sent to the control valve, acquiring a second air pressure value at a preset position, wherein the second control instruction is used for indicating the control valve to be closed. And comparing the absolute value of the difference value between the first air pressure value and the second air pressure value with a target threshold value, and when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, indicating that the control valve fails, and sending first warning information for indicating that the control valve fails at the moment to prompt a driver that the control valve fails.
It will be appreciated that the advantages of the second to sixth aspects may be found in the relevant description of the first aspect, and are not described here again.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a secondary air control valve failure diagnostic system provided in an embodiment of the present disclosure;
FIG. 2 is a flow chart of a secondary air control valve failure diagnostic method provided by an embodiment of the present disclosure;
FIG. 3 is a flow chart of a secondary air control valve failure diagnostic method provided by an embodiment of the present disclosure;
fig. 4 is a schematic structural view of a secondary air control valve failure diagnosis apparatus provided by an embodiment of the application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted in context as "when …" or "upon" or "in response to a determination" or "in response to detection. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The secondary air system of the motorcycle is in an impulse type, when the control valve is opened, under the action of negative pressure generated when the engine cylinder is exhausted, air in the external environment enters into the exhaust pipe of the cylinder through the control valve and the one-way valve, so that harmful gases (CO and HC) in the exhaust pipe are further combusted with the air, and the emission of harmful substances is reduced.
At present, aiming at the diagnosis scheme of the secondary air control valve of the existing motorcycle, fault diagnosis of the control valve is generally carried out based on data acquired by an oxygen sensor, but when an engine is cold started, the working temperature of the oxygen sensor cannot be reached, and at the moment, the oxygen sensor cannot acquire data, so that the diagnosis of the control valve cannot be carried out when the engine is cold started.
Based on the above problems, the present application provides a secondary air control valve failure diagnosis system. As shown in fig. 1, the secondary air control valve failure diagnosis system includes an air pressure sensor and a controller electrically connected to the air pressure sensor and the control valve, respectively.
Specifically, the air pressure sensor is installed at a preset position in a pipeline between the control valve and the one-way valve, and the air pressure sensor is installed at a position close to the one-way valve.
When the engine is cold started, after the rotating speed of the engine is stable, the controller controls the engine to maintain the current rotating speed, and a target threshold value is determined according to the current rotating speed of the engine. And then the controller sends a first control instruction to the control valve, and obtains a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve, wherein the first control instruction is used for indicating the control valve to be opened. And then the controller sends a second control instruction to the control valve, and the second air pressure value of the preset position is obtained, wherein the second control instruction is used for indicating the control valve to be closed. If the control valve can normally work, the control valve can be opened according to the first control instruction and can be closed according to the second control instruction. The absolute value of the difference between the first air pressure value and the second air pressure value at the acquired preset position should be greater than the target threshold value when the control valve is opened and closed. If the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, the control valve is indicated to be in fault, and at the moment, the controller sends first warning information used for representing the fault of the control valve to prompt a driver that the control valve is in fault. Therefore, the secondary air control valve fault diagnosis system provided by the embodiment of the application can realize fault diagnosis of the control valve during cold start of the engine.
The application also provides a vehicle comprising the secondary air control valve fault diagnosis system, and the vehicle can realize fault diagnosis of the secondary air control valve when the engine is cold started, and the specific working principle is as described above and is not repeated here.
In order to illustrate the technical scheme of the application, the following description is made by specific examples.
FIG. 2 is a flow chart of a secondary air control valve failure diagnostic method provided in an embodiment of the present application. As shown in fig. 2, the secondary air control valve failure diagnosis method includes steps S201 to S204.
In step S201, the engine is controlled to maintain the current rotation speed, and a target threshold is determined according to the current rotation speed of the engine.
Specifically, when the engine is cold started, after the rotation speed of the engine is stable, the engine is controlled to maintain the current rotation speed, the rotation speed of the engine is obtained through a sensor on the vehicle, and a corresponding target threshold value is determined according to the current rotation speed of the engine.
Step S202, after a first control instruction is sent to the control valve, a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve is obtained, wherein the first control instruction is used for indicating the control valve to be opened.
Specifically, after a first control instruction is sent to the control valve, a first air pressure value is obtained through an air pressure sensor arranged at a preset position in a pipeline between the control valve and the one-way valve.
Step S203, after sending a second control instruction to the control valve, obtaining a second air pressure value at a preset position, where the second control instruction is used to instruct the control valve to close.
Specifically, after a second control instruction is sent to the control valve, a second air pressure value is obtained through an air pressure sensor arranged at a preset position in a pipeline between the control valve and the one-way valve.
The fault types of the control valve comprise normally open faults and normally closed faults, and when the control valve has the normally open faults, the control valve cannot be completely closed; when the control valve fails normally, the control valve cannot be opened.
If the control valve has no fault, the first control command can control the control valve to be opened, and the second control command can control the control valve to be closed. The difference between the first air pressure value and the second air pressure value is larger, and the absolute value of the difference between the first air pressure value and the second air pressure value is larger than the target threshold. If the control valve fails, the difference between the first air pressure value and the second air pressure value is smaller, and the absolute value of the difference between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value.
Step S204, when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, first warning information is sent, wherein the first warning information is used for representing that the control valve fails.
Specifically, when the absolute value of the difference between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, the control valve is indicated to be faulty, and at the moment, first warning information used for indicating that the control valve is faulty is sent to prompt a driver that the control valve is faulty.
The diagnosis and alarm of the control valve faults can be realized through the steps S201 to S204, but the specific fault type of the control valve cannot be diagnosed. In order to be able to diagnose the failure type of the control valve, as shown in fig. 3, the secondary air control valve failure diagnosis method provided by the present application may further include steps S205 to S208.
Step S205, after a first control instruction is sent to the control valve, a plurality of air pressure values at the preset position are obtained in a first preset time, and the minimum value is selected from the plurality of air pressure values and is recorded as a third air pressure value.
Specifically, the designer may set a specific value of the first preset time according to the actual situation, for example, set the first preset time to 1 second, 2 seconds, 3 seconds, or the like. The designer can also set specific values for acquiring the number of air pressure values according to actual demands, for example, 5 air pressure values, 7 air pressure values or 8 air pressure values at preset positions are acquired in the first preset time.
The minimum air pressure value at the preset position can be acquired after the first control instruction is sent to the control valve by acquiring a plurality of air pressure values and acquiring the selected minimum air pressure value from the plurality of air pressure values as the third air pressure value.
And S206, when the third air pressure value is larger than the first preset air pressure value, sending second warning information, wherein the second warning information is used for representing that the control valve has a normally closed fault.
Specifically, after a first control instruction is sent to the control valve, if the control valve has no fault, the control valve can be opened, and under the action of negative pressure generated when the engine cylinder is exhausted, air in the external environment enters into the exhaust pipe of the cylinder through the control valve and the one-way valve, and the air pressure value at the preset position is smaller than the atmospheric pressure. If the control valve is in normally closed failure, air in the external environment cannot enter the exhaust pipe of the air cylinder through the control valve and the one-way valve, no air flows at a preset position, and the air pressure value at the preset position is approximately equal to the atmospheric pressure. It can be seen that the air pressure value at the preset position when the control valve is in the open state is smaller than the air pressure value at the preset position when the control valve is in the closed state.
A designer can determine a specific value of the first preset air pressure value through a test method, and when the control valve is opened, the third air pressure value is smaller than or equal to the first preset air pressure value; when the control valve is closed, the third air pressure value is larger than the first preset air pressure value. Therefore, when the third air pressure value is larger than the first preset air pressure value, the normally closed fault of the control valve is indicated, and at the moment, second warning information used for representing the normally closed fault of the control valve is sent to remind a driver.
Step S207, after a second control instruction is sent to the control valve, a plurality of air pressure values at the preset position are obtained in a second preset time, and the minimum value is selected from the plurality of air pressure values and is recorded as a fourth air pressure value.
Specifically, the designer may set a specific value of the second preset time according to the actual situation, for example, set the second preset time to 1 second, 2 seconds, 3 seconds, or the like. The designer can also set a specific value of the number of the obtained air pressure values according to actual demands, for example, 5 air pressure values, 7 air pressure values or 8 air pressure values at the preset position are obtained in the second preset time.
The minimum air pressure value at the preset position can be acquired after the second control instruction is sent to the control valve by acquiring a plurality of air pressure values and acquiring the selected minimum air pressure value from the plurality of air pressure values as the fourth air pressure value.
Step S208, when the fourth air pressure value is smaller than the second preset air pressure value, third warning information is sent, wherein the third warning information is used for representing that the control valve has normally open faults.
Specifically, after the second control instruction is sent to the control valve, if the control valve has no fault, the control valve can be closed, and then air in the external environment cannot enter the exhaust pipe of the air cylinder through the control valve and the one-way valve, no air flows in a preset position, and the air pressure value in the preset position is approximately equal to the atmospheric pressure. If the control valve is in a normally open fault, the control valve cannot be completely closed according to the second control instruction, and under the action of negative pressure generated when the engine cylinder is exhausted, air in the external environment enters into the exhaust pipe of the cylinder through the control valve and the one-way valve, and the air pressure value at the preset position is smaller than the atmospheric pressure. It can be seen that the air pressure value at the preset position when the control valve is in the open state is smaller than the air pressure value at the preset position when the control valve is in the closed state.
A designer can determine a specific value of the second preset air pressure value through a test method, and when the control valve is opened, the fourth air pressure value is smaller than the second preset air pressure value; when the control valve is closed, the fourth air pressure value is larger than or equal to the second preset air pressure value. Therefore, when the fourth air pressure value is smaller than or equal to the second preset air pressure value, the control valve is indicated to have a normally open fault, and at the moment, second warning information for indicating that the control valve has the normally open fault is sent to remind a driver.
In one embodiment of the application, the secondary air control valve failure diagnosis method further includes step S2001 and step S2002.
Step S2001, a plurality of sets of corresponding first rotational speeds and first thresholds are obtained, wherein the first rotational speeds are rotational speeds of the engine, the first thresholds are smaller than first standard thresholds, and the first standard thresholds are absolute values of differences between air pressure values at preset positions when the control valve is in an open state and air pressure values at preset positions when the control valve is in a closed state when the rotational speeds of the engine are the first rotational speeds.
Specifically, when the control valve is fault-free, a designer can control the engine to rotate at a first rotation speed, then obtain air pressure values at preset positions respectively in the state that the control valve is opened and closed, calculate absolute values of difference values of the two air pressure values to obtain a first standard threshold, and then determine the first threshold according to the first standard threshold, wherein the first threshold is smaller than the first standard threshold, so that a group of corresponding first rotation speed and first threshold are determined. By the method, the corresponding first threshold value is obtained by changing the first rotation speed of the engine, and therefore, the first rotation speeds and the first threshold values of the plurality of groups of engines can be obtained.
It should be noted that, the designer may set the first threshold according to the first standard threshold according to the actual situation, for example, set the first threshold to 80% of the first standard threshold, the first threshold is 70% of the first standard threshold, or the first threshold and the first standard threshold are in other proportional relationships, and the finally set first threshold is smaller than the first standard threshold.
Step S2002, the first rotation speed and the first threshold value in each group are associated and stored.
Specifically, after a plurality of groups of corresponding first rotating speeds and first thresholds are obtained, the first rotating speeds and the first thresholds of each group are associated, and then the associated data are stored. When diagnosing the control valve fault, the current rotation speed of the engine is firstly obtained, the first rotation speed closest to the current rotation speed is found out from a plurality of first rotation speeds, and the first rotation speed is taken as the target rotation speed. And then, searching a first threshold value associated with the target rotating speed in the plurality of first threshold values, and taking the first threshold value as a final target threshold value.
By storing the data in advance, the fault diagnosis of the control valve can be realized under the condition that the engine rotates at a plurality of speeds.
In one embodiment of the present application, step S202 may specifically include step S2021 and step S2022.
In step S2021, after a first control instruction is sent to the control valve, a preset number of air pressure values are obtained at preset positions according to a preset frequency.
Specifically, the designer may set the preset frequency according to the actual requirement, for example, set the preset frequency to 10 times/second, 20 times/second, or 30 times/second. The designer can set the preset number according to the actual requirement, for example, obtain 5 air pressure values, obtain 7 air pressure values or obtain 9 air pressure values.
In step S2022, the maximum value and the minimum value of the preset number of air pressure values are removed, and then the average value of the remaining air pressure values is obtained to obtain the first air pressure value.
Specifically, the maximum value and the minimum value in the air pressure values of the preset number are removed, so that the impurity signals in the acquired data can be removed. When the maximum value and the minimum value in the preset number of air pressure values are removed, the average value of the residual air pressure values is obtained to obtain a first air pressure value, and the accuracy of the first air pressure value can be improved.
In one embodiment of the present application, step S203 may specifically include step S2031 and step S2032.
Step S2031, after sending a second control instruction to the control valve, acquiring a preset number of air pressure values at a preset position according to a preset frequency.
Specifically, the designer may set the preset frequency according to the actual requirement, for example, set the preset frequency to 10 times/second, 20 times/second, or 30 times/second. The designer can set the preset number according to the actual requirement, for example, obtain 5 air pressure values, obtain 7 air pressure values or obtain 9 air pressure values.
Step S2032, removing the maximum value and the minimum value of the preset number of air pressure values, and obtaining an average value of the remaining air pressure values to obtain a second air pressure value.
Specifically, the maximum value and the minimum value in the air pressure values of the preset number are removed, so that the impurity signals in the acquired data can be removed. And after the maximum value and the minimum value in the preset number of air pressure values are removed, the average value of the residual air pressure values is calculated to obtain a second air pressure value, so that the accuracy of the second air pressure value can be improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Fig. 4 is a schematic structural view of a secondary air control valve failure diagnosis apparatus provided by an embodiment of the application.
As shown in fig. 4, the secondary air control valve failure diagnosis device includes:
a target threshold determining module 41 for controlling the engine to maintain a current rotation speed and determining a target threshold according to the current rotation speed of the engine;
the first air pressure value determining module 42 is configured to obtain a first air pressure value at a preset position in a pipeline between the control valve and the one-way valve after sending a first control instruction to the control valve, where the first control instruction is used to instruct the control valve to open;
a second air pressure value determining module 43, configured to obtain a second air pressure value of the preset position after sending a second control instruction to the control valve, where the second control instruction is used to instruct the control valve to close;
and a first warning information sending module 44, configured to send first warning information when an absolute value of the difference between the first air pressure value and the second air pressure value is less than or equal to the target threshold, where the first warning information is used to characterize that the control valve fails.
In one embodiment of the present application, the secondary air control valve failure diagnosis device further includes:
the third air pressure value determining module is used for acquiring a plurality of air pressure values of the preset position in a first preset time after the first control instruction is sent to the control valve, selecting the minimum value from the plurality of air pressure values and recording the minimum value as a third air pressure value;
and the second warning information sending module is used for sending second warning information when the third air pressure value is larger than the first preset air pressure value, wherein the second warning information is used for representing that the control valve has normally closed faults.
In one embodiment of the present application, the secondary air control valve failure diagnosis device further includes:
the fourth air pressure value determining module is used for acquiring a plurality of air pressure values of the preset position in a second preset time after sending the second control instruction to the control valve, selecting the minimum value from the plurality of air pressure values and recording the minimum value as a fourth air pressure value;
and the third warning information sending module is used for sending third warning information when the fourth air pressure value is smaller than a second preset air pressure value, wherein the third warning information is used for representing that the control valve has a normally open fault.
In one embodiment of the present application, the secondary air control valve failure diagnosis device further includes:
the data acquisition module is used for acquiring a plurality of groups of corresponding first rotating speeds and first thresholds, wherein the first rotating speeds are the rotating speeds of the engine, the first thresholds are smaller than first standard thresholds, and the first standard thresholds are absolute values of air pressure values of preset positions when the control valve is in an open state and air pressure value differences of the preset positions when the control valve is in a closed state when the rotating speeds of the engine are the first rotating speeds;
the storage module is used for correlating and storing the first rotating speed and the first threshold value in each group;
the target threshold determination module 41 is further configured to:
searching a first rotating speed closest to the current rotating speed from the plurality of first rotating speeds, and recording the first rotating speed as a target rotating speed;
and searching a first threshold value associated with the target rotating speed from the plurality of first threshold values, and recording the first threshold value as the target threshold value.
In one embodiment of the present application, the first air pressure value determining module 42 is further configured to:
after the first control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the first air pressure value.
In one embodiment of the present application, the second air pressure value determining module 43 is further configured to:
after the second control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the second air pressure value.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements steps for implementing the various method embodiments described above.
Embodiments of the present application provide a computer program product which, when run on a terminal, causes the terminal to perform steps that enable the implementation of the method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a terminal device, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc. In some jurisdictions, computer readable media may not be electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other manners. For example, the apparatus/network device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (10)

1. A secondary air control valve failure diagnosis method, characterized by comprising:
controlling an engine to maintain the current rotating speed, and determining a target threshold according to the current rotating speed of the engine;
after a first control instruction is sent to a control valve, a first air pressure value of a preset position in a pipeline between the control valve and a one-way valve is obtained, wherein the first control instruction is used for indicating the control valve to be opened;
after a second control instruction is sent to the control valve, a second air pressure value of the preset position is obtained, wherein the second control instruction is used for indicating the control valve to be closed;
and when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, sending first warning information, wherein the first warning information is used for representing that the control valve fails.
2. The secondary air control valve failure diagnosis method according to claim 1, characterized by further comprising, after transmitting first warning information when an absolute value of the difference between the first air pressure value and the second air pressure value is less than or equal to the target threshold value:
after the first control instruction is sent to the control valve, acquiring a plurality of air pressure values of the preset position in a first preset time, selecting the minimum value from the plurality of air pressure values, and recording the minimum value as a third air pressure value;
and when the third air pressure value is larger than the first preset air pressure value, sending second warning information, wherein the second warning information is used for representing that the control valve has a normally closed fault.
3. The secondary air control valve failure diagnosis method according to claim 1, characterized by further comprising, after transmitting first warning information when an absolute value of the difference between the first air pressure value and the second air pressure value is less than or equal to the target threshold value:
after the second control instruction is sent to the control valve, acquiring a plurality of air pressure values of the preset position in a second preset time, selecting the minimum value from the plurality of air pressure values, and recording the minimum value as a fourth air pressure value;
and when the fourth air pressure value is smaller than a second preset air pressure value, sending third warning information, wherein the third warning information is used for representing that the control valve has a normally open fault.
4. The secondary air control valve failure diagnosis method according to claim 1, characterized in that the method further comprises:
acquiring a plurality of groups of corresponding first rotating speeds and first thresholds, wherein the first rotating speeds are the rotating speeds of the engine, the first thresholds are smaller than first standard thresholds, and the first standard thresholds are absolute values of air pressure values of preset positions when the control valve is in an open state and air pressure value differences of the preset positions when the control valve is in a closed state when the rotating speeds of the engine are the first rotating speeds;
correlating and storing the first rotational speed and the first threshold value in each group;
the determining a target threshold according to the current rotation speed of the engine comprises the following steps:
searching a first rotating speed closest to the current rotating speed from the plurality of first rotating speeds, and recording the first rotating speed as a target rotating speed;
and searching a first threshold value associated with the target rotating speed from the plurality of first threshold values, and recording the first threshold value as the target threshold value.
5. The method for diagnosing a failure of a secondary air control valve according to claim 1, wherein after the first control command is sent to the control valve, obtaining a first air pressure value at a preset position in a pipe between the control valve and the check valve includes:
after the first control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the first air pressure value.
6. The secondary air control valve failure diagnosis method according to claim 1, wherein the step of acquiring the second air pressure value at the preset position after the second control command is sent to the control valve, includes:
after the second control instruction is sent to the control valve, acquiring a preset number of air pressure values at the preset position according to preset frequency;
and removing the maximum value and the minimum value in the preset number of air pressure values, and then obtaining the average value of the residual air pressure values to obtain the second air pressure value.
7. A secondary air control valve failure diagnosis device, characterized by comprising:
the target threshold determining module is used for controlling the engine to maintain the current rotating speed and determining a target threshold according to the current rotating speed of the engine;
the first air pressure value determining module is used for acquiring a first air pressure value of a preset position in a pipeline between the control valve and the one-way valve after sending a first control instruction to the control valve, wherein the first control instruction is used for indicating the control valve to be opened;
the second air pressure value determining module is used for acquiring a second air pressure value of the preset position after sending a second control instruction to the control valve, wherein the second control instruction is used for indicating the control valve to be closed;
and the first warning information sending module is used for sending first warning information when the absolute value of the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the target threshold value, wherein the first warning information is used for representing that the control valve fails.
8. A secondary air control valve failure diagnosis system comprising an air pressure sensor and a controller, the controller being electrically connected to the air pressure sensor and the control valve, respectively, the air pressure sensor being mounted at a preset position in a pipe between the control valve and the check valve for acquiring an air pressure value at the preset position, the controller being for performing the method of any one of claims 1 to 6.
9. A vehicle comprising the secondary air control valve failure diagnosis system according to claim 8.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 6.
CN202210141953.4A 2022-02-16 2022-02-16 Secondary air control valve fault diagnosis method, device and system and vehicle Active CN115217597B (en)

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