CN109184862B - Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof - Google Patents
Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof Download PDFInfo
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- CN109184862B CN109184862B CN201811116359.XA CN201811116359A CN109184862B CN 109184862 B CN109184862 B CN 109184862B CN 201811116359 A CN201811116359 A CN 201811116359A CN 109184862 B CN109184862 B CN 109184862B
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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
- 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
- F01N3/18—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 methods of operation; Control
- F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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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- Combustion & Propulsion (AREA)
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Abstract
The embodiment of the invention relates to a urea pump model identification method, a urea pump diagnostic instrument and a urea pump diagnostic system. The method comprises the following steps: after the urea pump is connected through a connecting wire harness corresponding to the urea pump, a detection value related to an identification circuit embedded in the connecting wire harness is obtained; determining the model of the urea pump connected with the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump; and displaying a urea pump diagnosis function interface corresponding to the model of the urea pump. The urea pump diagnostic instrument can detect the model of the automatic urea pump when a connecting line bundle is connected, and manual operation is not needed, so that the diagnostic efficiency of the urea pump is improved, and the condition of model identification error is avoided.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of vehicle-mounted equipment detection, in particular to a model identification method of a urea pump, a urea pump diagnostic instrument and a diagnostic system thereof.
[ background of the invention ]
Selective Catalytic Reduction (SCR) technology is NO for diesel engines meeting future stringent emissions regulationsXOne of the catalytic purification technologies has the advantages of good safety, low oil consumption, good sulfur resistance and the like. The working principle is that urea solution and NO are utilizedXOxidation-reduction reaction to generate N harmless to human body2And discharged to the atmosphere.
The urea pump is a core component of the SCR system, and mainly functions to pump the urea solution out of the urea tank and deliver the urea solution to the nozzle through a delivery pipe. In the actual use process, in order to ensure that the operational reliability of the urea pump meets the operational requirements of the SCR system, the urea pump needs to be calibrated. The performance of the urea pump is closely linked to the emission function of the engine.
The maintenance, calibration, and diagnosis of the urea pump generally depend on a specific apparatus such as a urea pump diagnostic apparatus or a diagnostic system. However, the model of the urea pump used is usually different for different diesel models. Therefore, the model of the urea pump must be determined on the urea diagnostic apparatus by the user in advance through manual selection during the diagnostic detection.
If the model is selected by mistake, the diagnosis operation is wrong, and the damage of the urea pump or the diagnosis instrument is easily caused.
[ summary of the invention ]
In order to solve the technical problem, embodiments of the present invention provide a method for identifying a model of a urea pump, a urea pump diagnostic apparatus, and a diagnostic system thereof, in which the model of the urea pump is automatically identified and a manual type selection error is avoided.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions: a method for identifying the model of a urea pump. The model identification method comprises the following steps: after the urea pump is connected through a connecting wire harness corresponding to the urea pump, a detection value related to an identification circuit embedded in the connecting wire harness is obtained; determining the model of the urea pump connected with the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump; and displaying a urea pump diagnosis function interface corresponding to the model of the urea pump.
Optionally, when one end of the identification circuit is connected with the detection circuit in the urea pump diagnostic apparatus and the other end of the identification circuit is connected with the ground, the method further comprises:
controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit; the acquiring of the detection value related to the identification circuit embedded in the connection harness includes: and acquiring detection values of the two ends of the identification circuit.
Optionally, the controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit includes: when the detection circuit comprises a constant current source, the constant current source in the detection circuit is controlled to work, so that the reference current generated by the constant current source passes through the identification circuit.
Optionally, the controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit includes: when the detection circuit comprises a power supply and a voltage division circuit, the power supply is controlled to provide reference voltage for the voltage division circuit and the identification circuit.
Optionally, after obtaining a detection value related to an identification circuit embedded in the connection harness, the method further comprises: processing the detection value to obtain a processed detection value;
the determining the model of the urea pump connected by the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump comprises the following steps: and determining the model of the urea pump connected by the connecting wire harness corresponding to the processed detection value according to the corresponding relation between the detection value and the model of the urea pump.
In order to solve the above technical problems, embodiments of the present invention further provide the following technical solutions: a urea pump diagnostic device. Wherein, the urea diagnostic apparatus includes: the wiring harness interface is used for connecting a connection wiring harness of the urea pump; an identification circuit is embedded in the connecting wire harness; the detection circuit is connected with the wire harness interface and is used for acquiring a detection value related to the identification circuit; the controller is connected with the detection circuit and used for determining the model of the urea pump corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump; and the display equipment is connected with the controller and is used for displaying a urea pump diagnosis function interface corresponding to the model of the urea pump.
Optionally, the detection circuit comprises: a reference output unit and a detection node; the reference output unit is used for providing a reference voltage or a reference current for the identification circuit; the detection node is configured to obtain a detection value associated with the identification circuit.
Optionally, the reference output unit comprises a constant current source; the constant current source is connected with the wire harness interface and used for outputting reference current at one of the connection pins of the wire harness interface so as to enable the reference current to pass through the identification circuit.
Optionally, the reference output unit includes a voltage dividing circuit and a power supply; the voltage division circuit is respectively connected with the power supply and the wiring harness interface, and is used for outputting reference voltage at one of the connection pins of the wiring harness interface to provide reference voltage for the identification circuit.
Optionally, the urea pump diagnostic apparatus further includes a signal processing circuit, connected to the controller, for processing a detection value output by the detection circuit to generate a processed detection value; and the controller is used for determining the model of the urea pump corresponding to the processed detection value according to the corresponding relation between the detection value and the model of the urea pump.
In order to solve the above technical problems, embodiments of the present invention further provide the following technical solutions: a universal urea pump diagnostic system. The universal urea pump diagnostic system includes: the device comprises a urea pump, a urea pump diagnostic instrument and an upper computer;
the urea pump comprises a connecting wire harness; the urea pump is connected with the urea pump diagnostic instrument through the connecting wire harness, and the urea pump diagnostic instrument is in communication connection with the upper computer; a marking resistor is arranged in the connecting wire harness; the resistance value of the identification resistor corresponds to the model of the urea pump; the urea pump diagnostic instrument automatically detects the model of the urea pump according to the identification resistor and feeds the model of the urea pump back to the upper computer; and the upper computer executes corresponding diagnosis command operation on the urea pump according to the model of the urea pump.
Compared with the prior art, the urea pump model identification and identification method provided by the embodiment of the invention can automatically realize the detection of the urea pump model when the connecting cable bundle is accessed, manual operation is not needed, and the problem of wrong identification of the urea pump model is avoided. The upper computer can execute corresponding diagnosis and detection operations based on the detection result of the urea pump diagnostic instrument, is suitable for the diagnosis and detection of various urea pumps of different models, has accurate detection result, and can not cause the damage of the urea pump or the diagnostic instrument.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of a urea pump diagnostic system according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a diagnosis upper computer according to an embodiment of the present invention;
FIG. 3 is a block diagram of a urea pump and a urea pump diagnostic apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a urea pump diagnostic apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a urea diagnostic apparatus according to another embodiment of the present invention;
FIG. 6 is a flowchart of a method for identifying a model of a urea pump according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "bottom," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The SCR technology is based on the nitrogen-oxygen reduction basic principle, urea aqueous solution with the mass fraction of 32.5 percent is used as a reducing agent, and NO in exhaust gas is converted into NO in the exhaust gas under the catalytic action of a catalyst surface coating (the exhaust temperature of a diesel engine is generally 200-500 ℃, and the activity requirement of a vanadium-based catalyst adopted by the SCR is basically met)XReduction to N2And H2O。
The urea pump of the diesel engine is an important component of a urea solution injection metering system, and mainly has the function of pumping out and conveying urea solution in a urea box to an injection unit after keeping a certain pressure so as to meet the requirements of the injection metering system on the flow and the pressure of the urea solution. The emissions function of an engine depends to a large extent on the calibration of the urea injection system and the associated performance of the urea pump.
Each diesel engine needs a urea pump with a specific model due to the difference of actual working condition parameters and the like. I.e. each diesel engine usually has a specific type of urea pump. The urea injection metering system is an important means for controlling the exhaust emission of the diesel engine, and plays a remarkable role in improving the environmental pollution caused by the exhaust emission.
In order to facilitate maintenance of the diesel engine and operation of fault detection and the like, a universal type detection and diagnosis device capable of integrating various diesel engine models is urgently needed in the prior art.
Fig. 1 is an application scenario of a urea pump diagnostic system according to an embodiment of the present invention. As shown in fig. 1, the urea pump diagnostic system may include: the diagnosis host computer 10, urea pump diagnostic apparatus 20 and urea pump 30.
The diagnostic host computer 10 may be any type of electronic computing platform for sending one or more operating instructions. The electronic computing platform may have a logical computing core and associated memory for running a particular software application or other computer software program.
The urea pump diagnostic apparatus 20 is a lower computer which is in communication connection with the diagnostic upper computer 10, and the urea pump diagnostic apparatus 20 is directly connected with a urea pump 30 to be diagnosed through a connection harness, and is used as an intermediary for data transmission, and feeds back the read equipment state data to the diagnostic upper computer after being processed in a proper data format (for example, the acquired equipment analog data signals are converted into digital signals and provided to the diagnostic upper computer 10).
The urea pumps 30 used or corresponding to different vehicle models are also different. In the embodiment of the present invention, for the sake of convenience of description, the "model of urea pump" is used to indicate the urea pump 30 used for different vehicle models. As shown in fig. 1, for n different vehicle models, n different models of urea pumps 30 are used.
The urea pump 30 for each model or model is designed or calibrated for the particular diesel model. Therefore, each urea pump 30 requires a diagnostic test operation using a corresponding software application (which may typically be selected by the diagnostic host computer 10).
When the apparatus is a general-purpose type urea pump diagnostic apparatus, the n different urea pumps 30 may be connected to the urea pump diagnostic apparatus 20 through a connection harness led from the urea pumps 30. The urea pump diagnosis instrument 20 may use a detection or diagnosis operation matched with the model (or model) of the urea pump 30 under the control of the upper computer.
Conventionally, after the urea pump diagnostic apparatus 20 is connected to the urea pump 39, the tester selects the model n of the urea pump. Then, the urea pump diagnostic instrument or the upper computer performs corresponding diagnosis and execution operations according to the urea pump diagnostic instrument or the upper computer.
However, such manual operation method completely depends on the control of the operator, which is very easy to cause the problem of type selection error, and the reliability is not high. For example, the operator may make a false determination of the model of the diesel engine urea pump connected to the diagnostic device, which may result in a false command to the urea pump diagnostic device. Alternatively, the wrong urea pump model n may be inadvertently clicked.
Once the urea pump is incorrectly selected, the urea pump or the urea pump diagnostic apparatus is easily damaged by the diagnostic execution operation performed by the urea pump diagnostic apparatus or the corresponding upper computer.
Fig. 2 is a block diagram of the diagnosis upper computer 10 according to the embodiment of the present invention. As shown in fig. 2, the diagnosis upper computer 10 may include: a processor 11, a memory 12, an input device 13, a display 14, and a communication module 15.
The processor 11, the memory 12, the input device 13, the display 14 and the communication module 15 are connected by a bus or other connection means to establish a communication connection between any two.
The processor 11 is any type of single-threaded or multi-threaded processor having one or more processing cores, and serves as a control core of the diagnostic host computer 10, and is configured to acquire data, execute a logical operation function, and issue an operation processing result.
The memory 12 serves as a non-volatile computer-readable storage medium, such as at least one magnetic disk storage device, flash memory device, distributed storage device remotely located from the processor 11, or other non-volatile solid-state storage device.
The memory 12 may have a program storage area for storing non-volatile software programs, non-volatile computer-executable programs, and modules for calling by the processor 11 to cause the processor 11 to perform one or more method steps. The memory 12 may also have a data storage area for storing the arithmetic processing result issued by the processor 12.
The input device 13 is a user interaction device for collecting user input instructions, such as a mouse, a keyboard, a touch panel or other input devices. The input device 13 receives information such as numbers or characters input by a user, and provides the information to the processor 11 to enable the processor 11 to execute corresponding control instructions.
The display 14 is an output device for presenting the corresponding data to the user in a particular form. It may be any type of display, such as an LED display, a tube display or an LCD display. The display screen 24 receives the display information output by the processor 21 and converts the display information into image information accordingly for the user.
In the process of performing the diagnosis operation of the urea pump, a user sends an instruction to the diagnosis upper computer 10 or obtains a feedback result of the diagnosis operation through the one or more input devices and the output device.
The communication module 15 is a functional module for establishing a communication connection with the urea pump diagnostic apparatus 20 and providing a physical channel. The communication module 15 may be any type of wireless or wired communication module, such as a WiFi module or a bluetooth module, etc. The communication module 15 may include an antenna, etc., which will not be described in detail herein.
The urea pump diagnostic apparatus 20 may be added with one or more functional modules based on the conventional diagnostic apparatus according to the needs of actual situations, so as to implement corresponding functions. For example, a corresponding hardware module may be configured to execute or implement the urea pump model identification method provided by the embodiment of the present invention.
By applying the urea pump model identification method provided by the embodiment of the invention, the urea pump model identification or judgment process can be changed into an automatic detection mode, so that the accuracy and reliability of the urea pump model identification are ensured.
Fig. 3 shows a urea pump and a urea pump diagnostic apparatus used in cooperation according to an embodiment of the present invention. When the urea pump and the urea pump diagnostic apparatus shown in fig. 3 are applied, the urea pump diagnostic apparatus can automatically detect and identify the model of the urea pump 30, and it is ensured that the diagnosis and judgment process or operation is matched with the model of the urea pump 30.
As shown in fig. 3, the urea pump 30 includes a urea pump main body 31 and a connection harness 32 on the side of the urea pump to be tested. The urea pump main body 31 is a pump main body for performing a urea pump function. Which is used as part of the SRC unit of a diesel engine to reduce emissions.
The connection harness 32 is a harness made up of a plurality of connection wires led out from the urea pump main body 31. The connection harness 32 may include a suitable number of connection lines for transmitting parameters or control commands related to the operating conditions of the urea pump 30.
In other embodiments, the connection harness 32 may also be connected to the urea pump and the urea pump diagnostic via respective connection interfaces as a separate component from the urea pump 30.
To mark different urea pump 30 models, corresponding identification circuitry may be embedded within the connection harness. The identification circuit may be comprised of one or more electronic components for feeding back a specific detection value. Each detection value is unique and corresponds to the model of a urea pump, the function similar to an identity tag is achieved, and the detection value is used as the basis for automatic detection of the model of the urea pump.
For example, the identification circuit may simply be configured as an identification resistor Rn. The identification resistor RnEmbedded in any connecting wire of the connecting wire harness and used as the mark of the model of the urea pump 30. As shown in fig. 3, the identification resistor RnOne of the connecting wires of the connecting wire harness can be accessed and grounded through the other connecting wire. Wherein each urea pump n has a unique corresponding identification resistor Rn。
With continued reference to fig. 3, on the side of a urea pump diagnostic apparatus that automatically detects the type of urea pump 30, the urea diagnostic apparatus 20 may include: a harness interface 21, a detection circuit 22, a controller 23, and a display device 24.
The harness interface 21 is an interface for connecting with a connection harness. For example, the harness interface 21 may be any type of interface 21 that includes a corresponding number of pins to enable a quick, pluggable connection with a connecting harness.
The detection circuit 22 is connected to the wire harness interface, and is configured to detect a detection value of an identification circuit embedded in the connection wire harness. The detection value may be an electrical parameter such as a voltage value, a current value, or a resistance value. For example, the total resistance value of the identification circuit (i.e., the resistance value when the identification circuit is regarded as one resistor), or the voltage value or the current value corresponding to the total resistance value, etc. may be used.
The detection circuit 22 may have any suitable detection circuit configuration for obtaining one or more of the detection values described above.
The controller 23 is a control center of the whole urea diagnostic apparatus, and can select corresponding control chips such as a microprocessor or a single chip microcomputer according to actual needs. The controller 23 may be provided with an information receiving pin connected to the detection circuit, and configured to obtain a detection value acquired by the detection circuit.
As described above, the detection value is particularly related to the configuration of the detection circuit used and the detection principle employed. For example, as shown in fig. 3, the detection value may be an analog quantity such as a voltage or a current that follows a change in the resistance value of the identification resistance.
After receiving the detection value, the controller 23 may determine the model of the urea pump connected to the harness interface 21 according to the detection value, thereby implementing automatic detection of the model of the urea pump.
The display device 24 is connected to the controller 23, and is configured to display a urea pump diagnosis function interface corresponding to the model of the urea pump under the control of the controller 23.
The display device 24 may be any type or principle of image interaction device for presenting a corresponding operation interaction interface to a user, including but not limited to an LED, LCD or liquid crystal display.
It should be noted that part or all of the functions of the display device 24 can also be implemented by a host computer. Namely, a urea pump diagnosis interface corresponding to the model of the urea pump is displayed on the upper computer so as to realize the diagnosis of the urea pump.
In some embodiments, as shown in fig. 3, the detection circuit 22 may be composed of a reference output cell 221 and a detection node 222.
Wherein the reference output unit 221 is configured to provide a reference voltage or a reference current to the identification circuit. The reference voltage or the reference current is a voltage or a current which has good stability and fluctuates only in a narrow range.
The detection node 222 is a node for acquiring a detection value relating to the identification circuit. The detection node is connected with the identification circuit and is a sampling node for collecting detection values. The reference output unit 221 and the detection node 222 cooperate to obtain the detection value.
In other embodiments, to improve detection accuracy and precision, the urea pump diagnostic apparatus may further include a signal processing circuit 25, as shown in fig. 3.
The signal processing circuit 25 is disposed between the detection circuit 22 and the controller 23, and is configured to process a detection value output by the detection circuit to generate a processed detection value.
The processing refers to a preprocessing process performed on the detected values, and may specifically use appropriate processing according to actual needs, including but not limited to noise reduction, down-sampling, or signal mode conversion (such as analog-to-digital conversion). The accuracy of the detection value can be improved through the pretreatment, so that the automatic identification of the model of the urea pump is better realized.
And the controller 23 determines the model of the urea pump corresponding to the processed detection value according to the corresponding relationship between the known detection value and the model of the urea pump, so as to realize automatic identification of the model of the urea pump.
Fig. 4 shows a structure of a resistance detection circuit that can be specifically adopted by the detection circuit. However, it will be understood by those skilled in the art that other detection circuits may be provided or adopted according to the actual requirement, and the resistance value of the identification resistor is reflected or measured by the detection value, and is not limited to the detection circuit shown in fig. 4.
As shown in fig. 4, the reference output unit 221 may include a constant current source. The constant current source 221 may be any circuit structure capable of supplying a constant current with an output substantially unaffected by an external load. Those skilled in the art can select various types of constant current source circuits according to the requirements of practical applications (such as precision requirements, constant current magnitude, etc.). In the present embodiment, the constant current source 221 is implemented based on a stable dc voltage VCC.
The constant current source 221 is connected to the harness interface 21. Specifically, it may be connected to one of the pins of the wire harness interface 21 so as to output a constant reference current at the connection pin.
In this embodiment, the pin corresponds to the connection wire in the connection wire bundle, in which the identification resistor is embedded. Thus, when the connection harness is connected to the connection pin, the reference current I output from the constant current source 221 passes through the identification resistor RnThe corresponding voltage is formed in the branch.
The detection node 222 is a voltage node derived from a pin connected to the constant current source 221. As shown in fig. 2, the resistance R is markednThe voltage value developed at the reference current is equal to the voltage value of the sense node 222.
The controller 23 may be connected to the detection node 222, and may sample the detection node 222 to obtain a voltage detection value. The reference current output from the constant current source 221 is constant. Therefore, the magnitude of the voltage detection value is actually dependent on the identification resistance RnThe magnitude of the resistance value of (2).
After the controller 23 obtains the voltage detection value, the controller may determine the resistance value of the identification resistor according to the relationship between the voltage detection value and the resistance value of the identification resistor, so as to uniquely determine the specific model of the urea pump.
The correspondence between the resistance value of the identification resistor and the model of the urea pump can be recorded in a correspondence table and stored in a memory of the urea pump diagnostic apparatus. The controller 23 calls the correspondence table recorded in the memory to determine the specific model of the urea pump according to the detection value.
Of course, the corresponding table can also be stored in a memory of the diagnosis upper computer, and the model n of the urea pump is directly determined by the diagnosis upper computer according to a detection value provided by the urea pump diagnostic instrument.
Fig. 5 is a detection circuit according to another embodiment of the present invention. As shown in fig. 5, the reference output unit 221 may include a voltage dividing circuit 221 and a power supply VCC.
The voltage dividing circuit 221 is connected to the power supply and the harness interface, and is configured to output a reference voltage at one of the connection pins of the harness interface to provide the reference voltage for the identification circuit.
In the present embodiment, the voltage divider 221 is implemented by a voltage stabilizing circuit having a specific resistance. The divider resistor is connected in series with the identification circuit.
The controller 23 may be connected to the detection node 222, and may sample the detection node 222 to obtain a voltage detection value. Since the resistance value of the voltage dividing circuit 221 does not change. Therefore, the magnitude of the voltage detection value is actually dependent on the identification resistance RnThe magnitude of the resistance value of (2).
After the controller 23 obtains the voltage detection value, the controller may determine the resistance value of the identification resistor according to the relationship between the voltage detection value and the resistance value of the identification resistor, so as to uniquely determine the specific model of the urea pump.
Corresponding to the urea pump diagnostic apparatus disclosed in the above embodiment, the embodiment of the present invention further provides a model detection method for a urea pump.
As shown in fig. 6, after the urea pump is connected by the connection harness corresponding to the urea pump, the method for detecting the model of the urea pump may include the following steps:
610. a detection value associated with an identification circuit embedded within the connection harness is obtained.
620. And determining the model of the urea pump connected by the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump.
The detection value may be electrical data reflecting the identification circuit, and there is a one-to-one correspondence with the urea pump model. Therefore, the detection value can be used as an identification mark for determining the model of the urea pump.
630. And displaying a urea pump diagnosis function interface corresponding to the model of the urea pump.
The urea pump diagnostic function interface is an operational interface. The diagnostic instrument may be controlled to perform one or more diagnostic operations on the operations interface.
In addition, the model of the urea pump obtained by the automatic detection of the urea pump diagnostic instrument is also uploaded to the diagnostic upper computer. After receiving the specific model information of the currently connected urea pump, the diagnosis upper computer can select a software application program matched with the urea pump and issue a corresponding diagnosis operation instruction.
In some embodiments, when one end of the identification circuit is connected to the detection circuit in the urea pump diagnostic instrument and the other end of the identification circuit is connected to ground, the method may further include: and controlling the detection circuit to provide a reference voltage or a reference current for the identification circuit.
Correspondingly, step 610 specifically includes: and acquiring detection values of the two ends of the identification circuit. The detection value may be a voltage value generated by the identification circuit at a reference current or a voltage value generated at a reference voltage.
Specifically, when the detection circuit includes a power supply and a voltage division circuit, the power supply is controlled to provide a reference voltage for the voltage division circuit and the identification circuit. Or, when the detection circuit comprises a constant current source, the constant current source in the detection circuit is controlled to work, so that the reference current generated by the constant current source passes through the identification circuit.
In other embodiments, after step 610, the model auto-diagnosis method may further include: and processing the detection value to obtain a processed detection value. And then, determining the model of the urea pump connected by the connecting wire harness corresponding to the processed detection value according to the corresponding relation between the detection value and the model of the urea pump.
By applying the urea diagnostic apparatus and the upper computer provided by the embodiment, a universal urea pump diagnostic system can be constructed, and the urea pump diagnostic apparatus and the upper computer are suitable for diagnostic operation of all different urea pumps. In the actual use process, the urea pump diagnostic instrument is connected with the urea pump through a connecting wire harness. After connection, the urea pump diagnostic instrument detects and determines the identification circuit embedded in the connection cable harness of the urea pump through the built-in detection circuit, so that the model of the urea pump is determined, and automatic detection of the model of the urea pump is realized.
The detection result of the urea pump is fed back to the diagnosis upper computer through the urea pump diagnosis, and the diagnosis upper computer intelligently operates the urea pump according to the vehicle type.
In summary, the universal urea pump diagnostic system provided by the embodiment of the invention realizes automatic detection of the type of the urea pump in a simple hardware implementation manner, and can be widely applied to all types of urea pumps. The automatic detection of the model of the urea pump is beneficial to improving the detection and diagnosis efficiency, and is convenient for maintenance personnel to operate. And the accuracy rate of automatic detection is high, can not lead to the urea pump because of operating command and the not matched problem such as damage that leads to of model.
It will be further appreciated by those of skill in the art that the various steps of the exemplary data transmission control methods described in connection with the embodiments disclosed herein can be embodied in electronic hardware, computer software, or combinations of both, and that the various exemplary components and steps have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation.
Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. The computer software may be stored in a computer readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory or a random access memory.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A method for identifying the model of a urea pump is characterized by comprising the following steps:
after the urea pump is connected through a connecting wire harness corresponding to the urea pump, a detection value related to an identification circuit embedded in the connecting wire harness is obtained;
determining the model of the urea pump connected with the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump;
and displaying a urea pump diagnosis function interface corresponding to the model of the urea pump.
2. The method of claim 1, wherein when one end of the identification circuit is connected to a detection circuit in a urea pump diagnostic instrument and the other end of the identification circuit is connected to ground, the method further comprises:
controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit;
the acquiring of the detection value related to the identification circuit embedded in the connection harness includes:
and acquiring detection values of the two ends of the identification circuit.
3. The method of claim 2, wherein the controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit comprises:
when the detection circuit comprises a constant current source, the constant current source in the detection circuit is controlled to work, so that the reference current generated by the constant current source passes through the identification circuit.
4. The method of claim 2, wherein the controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit comprises:
when the detection circuit comprises a power supply and a voltage division circuit, the power supply is controlled to provide reference voltage for the voltage division circuit and the identification circuit.
5. The method of any of claims 1-4, wherein after obtaining a detection value associated with an identification circuit embedded within the connection harness, the method further comprises:
processing the detection value to obtain a processed detection value;
the determining the model of the urea pump connected by the connecting wire harness corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump comprises the following steps:
and determining the model of the urea pump connected by the connecting wire harness corresponding to the processed detection value according to the corresponding relation between the detection value and the model of the urea pump.
6. A urea pump diagnostic, comprising:
the wiring harness interface is used for connecting a connection wiring harness of the urea pump; an identification circuit is embedded in the connecting wire harness;
the detection circuit is connected with the wire harness interface and is used for acquiring a detection value related to the identification circuit;
the controller is connected with the detection circuit and used for determining the model of the urea pump corresponding to the detection value according to the corresponding relation between the detection value and the model of the urea pump;
and the display equipment is connected with the controller and is used for displaying a urea pump diagnosis function interface corresponding to the model of the urea pump.
7. The urea pump diagnostic apparatus of claim 6, wherein the detection circuit comprises: a reference output unit and a detection node;
the reference output unit is used for providing a reference voltage or a reference current for the identification circuit;
the detection node is configured to obtain a detection value associated with the identification circuit.
8. The urea pump diagnostic apparatus according to claim 7, wherein the reference output unit includes a constant current source;
the constant current source is connected with the wire harness interface and used for outputting reference current at one of the connection pins of the wire harness interface so as to enable the reference current to pass through the identification circuit.
9. The urea pump diagnostic apparatus according to claim 7, wherein the reference output unit includes a voltage dividing circuit and a power supply;
the voltage division circuit is respectively connected with the power supply and the wiring harness interface, and is used for outputting reference voltage at one of the connection pins of the wiring harness interface to provide reference voltage for the identification circuit.
10. The urea pump diagnostic apparatus according to any one of claims 6-9, further comprising a signal processing circuit connected to the controller for processing the detection value output by the detection circuit to generate a processed detection value;
and the controller is used for determining the model of the urea pump corresponding to the processed detection value according to the corresponding relation between the detection value and the model of the urea pump.
11. A universal urea pump diagnostic system, comprising: the device comprises a urea pump, a urea pump diagnostic instrument and an upper computer;
the urea pump comprises a connecting wire harness; the urea pump is connected with the urea pump diagnostic instrument through the connecting wire harness, and the urea pump diagnostic instrument is in communication connection with the upper computer;
an identification circuit is arranged in the connecting wire harness; the identification circuit has a detection value corresponding to the model of the urea pump;
the urea pump diagnostic instrument automatically detects the model of the urea pump according to the detection value of the identification circuit and feeds the model of the urea pump back to the upper computer; and the upper computer executes corresponding diagnosis command operation on the urea pump according to the model of the urea pump.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811116359.XA CN109184862B (en) | 2018-09-25 | 2018-09-25 | Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof |
| PCT/CN2019/107845 WO2020063672A1 (en) | 2018-09-25 | 2019-09-25 | Urea pump model recognition method, urea pump diagnostic instrument, and diagnostic system thereof |
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| CN201811116359.XA CN109184862B (en) | 2018-09-25 | 2018-09-25 | Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof |
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| CN109184862B (en) * | 2018-09-25 | 2020-11-13 | 深圳市道通科技股份有限公司 | Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof |
| CN212867869U (en) * | 2020-05-09 | 2021-04-02 | 深圳市云伽智能技术有限公司 | Urea pump drive detection device and system |
| CN112087588A (en) * | 2020-08-10 | 2020-12-15 | 西安万像电子科技有限公司 | Interface conversion method and interface converter |
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| CN109184862A (en) | 2019-01-11 |
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