WO2020063672A1

WO2020063672A1 - Urea pump model recognition method, urea pump diagnostic instrument, and diagnostic system thereof

Info

Publication number: WO2020063672A1
Application number: PCT/CN2019/107845
Authority: WO
Inventors: 施三保; 陈勇; 孟宪初
Original assignee: 深圳市道通科技股份有限公司
Priority date: 2018-09-25
Filing date: 2019-09-25
Publication date: 2020-04-02
Also published as: CN109184862B; CN109184862A

Abstract

A urea pump model recognition method, a urea pump diagnostic instrument (20), and a diagnostic system thereof. The urea pump model recognition method comprises: after connecting a urea pump (30) by means of a connecting cable harness (32) corresponding to the urea pump (30), acquiring a detection value related to an identification circuit embedded in the connecting cable harness (32); on the basis of a corresponding relationship between detection values and urea pump (30) models, determining the model of the urea pump (30) connected to the connecting cable harness (32) corresponding to the detection value; and displaying a urea pump diagnostic function interface corresponding to the model of the urea pump (30). The urea pump diagnostic instrument (20) can automatically detect the urea pump model when the connecting cable harness (32) is connected, without needing a manual operation, thereby increasing the diagnostic efficiency of the urea pump (30) and preventing the occurrence of model recognition errors.

Description

Model recognition method of urea pump, urea pump diagnostic instrument and diagnostic system thereof

This application claims the priority of a Chinese patent application filed on September 25, 2018 with the Chinese Patent Office, application number 201811116359.X, and application name "Urea Pump Model Identification Method, Urea Pump Diagnostic Apparatus and Diagnostic System", The entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the technical field of vehicle-mounted equipment detection, and in particular, to a method for identifying a type of a urea pump, a urea pump diagnostic instrument, and a diagnostic system thereof.

Background technique

Selective catalytic reduction (SCR) technology is one of the NO _X catalytic purification technologies for diesel engines that meet the strict emission regulations of the future. It has the advantages of good safety, low fuel consumption, and good sulfur resistance. Its working principle is to use a urea solution to react with NO _x to reduce N _{2 to} generate non-toxic N ₂ to the human body and discharge it into the atmosphere.

Among them, the urea pump is the core component of the SCR system, and its main function is to pump the urea solution out of the urea tank, and transport the urea solution to the nozzle through the pipeline. In actual use, in order to ensure that the working reliability of the urea pump meets the working requirements of the SCR system, the urea pump needs to be calibrated. The performance of the urea pump is closely related to the emission function of the engine.

Maintenance, calibration, and diagnosis of urea pumps often depend on equipment such as specific urea pump diagnostics or diagnostic systems. However, for different diesel models, the models of urea pumps used are usually different. Therefore, the user must determine the model of the urea pump on the urea diagnostic instrument through manual selection in advance during the diagnostic test.

If the model is selected by mistake, it will lead to incorrect diagnostic operation and easily cause damage to the urea pump or diagnostic instrument.

Summary of the Invention

In order to solve the above technical problems, an embodiment of the present invention provides a method for identifying the type of a urea pump, a method for identifying the type of the urea pump, a urea pump diagnostic instrument, and a diagnostic system thereof to avoid manual selection errors.

To solve the above technical problems, the embodiments of the present invention provide the following technical solutions: a method for identifying a type of a urea pump. The model identification method includes: after connecting the urea pump through a connection harness corresponding to the urea pump, obtaining a detection value related to an identification circuit embedded in the connection harness; according to the correspondence between the detection value and the model of the urea pump, Determining the type of the urea pump connected to the connection harness corresponding to the detection value; and displaying a urea pump diagnostic function interface corresponding to the type of the urea pump.

Optionally, 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 includes:

Controlling the detection circuit to provide a reference voltage or a reference current to the identification circuit; and acquiring the detection value related to the identification circuit embedded in the connection harness includes: acquiring the detection value at 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 includes a constant current source, controlling the constant current source in the detection circuit to work so that A 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 includes a power supply and a voltage dividing circuit, controlling the power supply to the voltage dividing circuit and the voltage dividing circuit. The identification circuit provides a reference voltage.

Optionally, after acquiring the detection value related to the identification circuit embedded in the connection harness, the method further includes: processing the detection value to obtain a processed detection value;

The determining the type of the urea pump connected to the connection harness corresponding to the detected value according to the correspondence between the detected value and the model of the urea pump includes: determining the processing according to the correspondence between the detected value and the model of the urea pump. The latter detection value corresponds to the model of the urea pump connected to the connection harness.

To solve the above technical problems, the embodiments of the present invention further provide the following technical solutions: a urea pump diagnostic instrument. The urea diagnostic instrument includes: a wiring harness interface, the wiring harness interface is used to connect a connection wiring harness of a urea pump; an identification circuit is embedded in the connection wiring harness; a detection circuit, the detection circuit is connected to the wiring harness interface, and For obtaining a detection value related to the identification circuit; a controller, the controller being connected to the detection circuit, for determining the type of the urea pump corresponding to the detection value according to the correspondence between the detection value and the type of the urea pump A display device connected to the controller and configured to display a urea pump diagnostic function interface corresponding to the type of the urea pump.

Optionally, the detection circuit includes: a reference output unit and a detection node; the reference output unit is configured to provide a reference voltage or a reference current to the identification circuit; and the detection node is configured to obtain a reference circuit related to the identification circuit. Detection value.

Optionally, the reference output unit includes a constant current source; the constant current source is connected to the wiring harness interface, and is configured to output a reference current at one of the connection pins of the wiring harness interface, so that the reference current passes through The identification circuit.

Optionally, the reference output unit includes a voltage dividing circuit and a power source; the voltage dividing circuit is respectively connected to the power source and the wiring harness interface, and is configured to output a reference voltage at one of the connection pins of the wiring harness interface, A reference voltage is provided for the identification circuit.

Optionally, the urea pump diagnostic instrument further includes a signal processing circuit, which is connected to the controller and is configured to process the detection value output by the detection circuit to generate a processed detection value; The controller is configured to determine the type of the urea pump corresponding to the processed detection value according to the correspondence between the detected value and the type of the urea pump.

To solve the above technical problems, the embodiments of the present invention also provide the following technical solutions: a universal urea pump diagnostic system. The universal urea pump diagnostic system includes: a urea pump, a urea pump diagnostic instrument, and a host computer;

The urea pump includes a connection wiring harness; the urea pump is connected to the urea pump diagnostic instrument through the connection wiring harness, the urea pump diagnostic instrument is communicatively connected to the host computer, and an identification resistor is provided in the connection wiring harness The resistance value of the identification resistor corresponds to the type of the urea pump; the urea pump diagnostic instrument automatically detects the type of the urea pump according to the identification resistance, and feeds back the urea pump to the host computer. Model; the host computer executes a corresponding diagnostic 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 in the embodiments of the present invention can automatically detect the urea pump model when the connection harness is connected, without the need for manual and manual operations, and avoiding urea pump model identification errors. problem. Based on the test results of the urea pump diagnostic instrument, the host computer can perform the corresponding diagnostic testing operations, and is suitable for the diagnostic testing of a variety of different types of urea pumps. The test results are accurate and will not cause damage to the urea pump or diagnostic equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments are exemplified by the pictures in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the drawings in the drawings do not constitute a limitation on scale.

1 is a schematic diagram of a urea pump diagnosis system according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of a diagnosis host computer according to an embodiment of the present invention; FIG.

3 is a structural block diagram of a urea pump and a urea pump diagnostic apparatus according to an embodiment of the present invention;

4 is a circuit schematic diagram of a urea pump diagnostic instrument according to an embodiment of the present invention;

5 is a schematic circuit diagram of a urea diagnostic instrument according to another embodiment of the present invention;

FIG. 6 is a method flowchart of a method for identifying a type of a urea pump according to an embodiment of the present invention.

detailed description

In order to facilitate understanding of the present invention, the following describes the present invention in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it may be directly on the other element, or there may be one or more centered elements in between. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The directions or positional relationships indicated by the terms "upper", "lower", "inside", "outside", "bottom" and the like used in this specification are based on the positional or positional relationships shown in the drawings, and are only for the convenience of describing The invention and simplified description, rather than indicating or implying that the device or element referred to, must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Unless defined otherwise, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

SCR technology is based on the basic principle of nitrogen and oxygen reduction, using a urea solution with a mass fraction of 32.5% as a reducing agent, under the catalysis of the catalyst surface coating (the exhaust temperature of diesel engines is generally 200-500 ° C, which basically meets the requirements of SCR Vanadium-based catalysts are required to reduce NOX in exhaust gas to N2 and H2O.

The urea pump of the diesel engine is an important part of the urea solution injection metering system. Its main function is to maintain a certain pressure of the urea solution in the urea tank and pump it out to the injection unit to meet the flow and pressure of the urea solution by the injection metering system. Requirements. The engine's emission function depends to a large extent on the calibration of the urea injection system and the related performance of the urea pump.

Each diesel engine requires a urea pump of a specific model due to differences in its actual operating parameters. That is, each diesel engine usually has a specific type of urea pump. Urea injection metering system, as an important means to control diesel engine exhaust, has played a significant role in improving environmental pollution caused by exhaust emissions.

In order to facilitate the operation of diesel engine maintenance, fault detection, etc., in the prior art, there is an urgent need for a universal detection and diagnosis device capable of integrating multiple diesel engine models.

FIG. 1 is an application scenario of a urea pump diagnosis system according to an embodiment of the present invention. As shown in FIG. 1, the urea pump diagnosis system may include a diagnosis host computer 10, a urea pump diagnostic instrument 20, and a urea pump 30.

The diagnostic host computer 10 may be any type of electronic computing platform for sending one or more operation instructions. The electronic computing platform may be provided with a logic operation core and a matching memory for running specific software applications or other computer software programs.

The urea pump diagnostic instrument 20 is a lower computer which establishes a communication connection with the diagnostic upper computer 10. The urea pump diagnostic instrument 20 is directly connected to the urea pump 30 to be detected and diagnosed through a connection harness for data transmission. The intermediary, after reading the device status data obtained through a suitable data format, feeds it back to the diagnostic host computer (for example, converts the acquired device analog data signal into a digital signal and provides it to the diagnostic host computer 10).

For different models, the urea pump 30 used or corresponding is also different. In the embodiment of the present invention, for the sake of simplicity, the “urea pump model” is used to indicate the urea pump 30 used in different vehicle models. As shown in FIG. 1, for n different models, n different types of urea pumps 30 are used.

The urea pump 30 of each model or model is designed or calibrated for a specific diesel engine model. Therefore, each urea pump 30 needs to use a corresponding software application program (which can usually be selected by the diagnostic host computer 10) for diagnostic testing operations.

When used as a universal urea pump diagnostic instrument, the n different urea pumps 30 can be connected to the urea pump diagnostic instrument 20 through a connection harness led out by the urea pump 30. Under the control of the host computer, the urea pump diagnostic instrument 20 may use a detection or diagnosis operation that matches the model (or vehicle model) of the urea pump 30.

Conventionally, after the urea pump diagnostic instrument 20 is connected to the urea pump 39, the type n of the urea pump is selected by the inspector. Then, the urea pump diagnostic instrument or host computer makes the corresponding diagnosis and executes the operation accordingly.

However, such a manual operation method completely depends on the control of the operator, which is very prone to the problem of wrong selection and low reliability. For example, the operator may have misjudged the type of the urea pump of the diesel engine connected to the diagnostic instrument, which may lead to the wrong instruction to the urea pump diagnostic instrument. Or, due to negligence, the wrong urea pump model n was selected.

Once the urea pump selection error occurs, the diagnostic operation performed by the urea pump diagnostic instrument or the corresponding host computer can easily cause damage to the urea pump or urea pump diagnostic instrument.

FIG. 2 is a structural block diagram of a diagnostic host computer 10 according to an embodiment of the present invention. As shown in FIG. 2, the diagnostic host computer 10 may include a processor 11, a memory 12, an input device 13, a display screen 14, and a communication module 15.

The processor 11, the memory 12, the input device 13, the display screen 14, and the communication module 15 establish a communication connection between any two by using a bus or other connection methods.

The processor 11 is any type of single-threaded or multi-threaded processor with one or more processing cores. As the control core of the diagnostic upper computer 10, it is used to obtain data, perform logical operation functions, and issue operation processing results.

The memory 12 is a non-volatile computer-readable storage medium, for example, at least one magnetic disk storage device, a flash memory device, a distributed storage device remotely disposed relative to the processor 11, or other non-volatile solid-state storage devices.

The memory 12 may have a program storage area for storing a non-volatile software program, a non-volatile computer executable program, and a module, which are called by the processor 11 to cause the processor 11 to execute one or more method steps. The memory 12 may also have a data storage area, which is used to store the operation processing results 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 so that the processor 11 executes a corresponding control instruction.

The display screen 14 is an output device for displaying the corresponding data to the user in a specific form. It can be any type of display, such as an LED display, a kinescope display, or an LCD display. The display screen 24 receives the display information output by the processor 21 and correspondingly converts it into image information and provides it to the user.

During the diagnostic operation of the urea pump, the user sends an instruction to the diagnostic host computer 10 or obtains the feedback result of the diagnostic operation through the one or more input devices and output devices.

The communication module 15 is a function module for establishing a communication connection with the urea pump diagnostic instrument 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. The communication module 15 may include a device such as an antenna, which is not described in detail herein.

The urea pump diagnostic instrument 20 can be added with one or more functional modules on the basis of the traditional diagnostic instrument according to the needs of the actual situation, so as to realize corresponding functions. For example, a corresponding hardware module may be set to execute or implement the method for identifying a urea pump model provided by an embodiment of the present invention.

By applying the urea pump model identification method provided in the embodiment of the present invention, the above urea pump model identification or judgment process can be changed into an automatic detection form, thereby ensuring the accuracy and reliability of the urea pump model identification.

FIG. 3 is a urea pump and a urea pump diagnostic instrument provided in cooperation according to an embodiment of the present invention. When the urea pump and the urea pump diagnostic instrument shown in FIG. 3 are applied, the urea pump diagnostic instrument can automatically detect and identify the type of the urea pump 30, and ensure that the diagnostic judgment process or operation matches the type of the urea pump 30. .

As shown in FIG. 3, on the side of the urea pump to be detected, the urea pump 30 includes a urea pump main body 31 and a connection harness 32. The urea pump body 31 is a pump body for performing a urea pump function. It is used as part of diesel SRC installations to reduce emissions.

The connection wiring harness 32 is a wiring harness composed of a plurality of connection wires drawn from the urea pump main body 31. The connection harness 32 may include a suitable number of connection wires for transmitting parameters or control instructions related to the operating status of the urea pump 30.

In other embodiments, the connection wire harness 32 can also be used as an independent component relative to the urea pump 30, and connected to the urea pump and the urea pump diagnostic instrument through corresponding connection interfaces, respectively.

In order to mark different types of urea pumps 30, corresponding identification circuits may be embedded in the connection wiring harness. The identification circuit may be composed of one or more electronic components to feedback a specific detection value. Each detection value uniquely corresponds to a type of urea pump, and plays a role similar to an identity tag, as the basis for automatic detection of the urea pump model.

For example, the identification circuit can be simply set to identify the resistance Rn. The identification resistor Rn is embedded in any connection line of the connection harness, and is used as an identification of the 30 model of the urea pump. As shown in FIG. 3, the identification resistor Rn can be connected to one of the connecting wires of the connecting wire harness and grounded through the other connecting wire. Among them, each urea pump n has a unique corresponding resistance Rn.

Please continue to refer to FIG. 3. On the side of the urea pump diagnostic instrument that automatically detects the urea pump 30 model, the urea diagnostic instrument 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 wiring harness interface 21 may be any type of interface 21, which includes a corresponding number of pins, and realizes a fast pluggable connection with a connection wiring harness.

The detection circuit 22 is connected to the wiring harness interface, and is configured to detect a detection value of an identification circuit embedded in the connection wiring harness. The detection value may be an electrical parameter such as a voltage value, a current value, or a resistance value. For example, it can be the total resistance value of the identification circuit (that is, the resistance value when the identification circuit is regarded as a resistor), or the voltage value or current value corresponding to the total resistance value.

The detection circuit 22 may have any suitable detection circuit structure for acquiring one or more detection values described above.

The controller 23 is a control center of the entire urea diagnostic apparatus, and it may select a corresponding microprocessor or a single chip microcomputer control chip according to actual needs. The controller 23 may have an information receiving pin connected to the detection circuit for acquiring a detection value acquired by the detection circuit.

As described above, the detection value is specifically related to the structure of the detection circuit used and the detection principle adopted. For example, as shown in FIG. 3, the detection value may be an analog quantity such as a voltage or a current following a change in the resistance value of the identification resistance.

After receiving the detection value, the controller 23 may determine the type of the urea pump connected to the harness interface 21 according to the detection value, thereby implementing automatic detection of the type of the urea pump.

A display device 24 is connected to the controller 23 and is configured to display a urea pump diagnostic function interface corresponding to the type of the urea pump under the control of the controller 23.

The display device 24 may adopt any type or principle of an image interactive device for displaying a corresponding operation interactive interface to a user, including but not limited to an LED, an LCD, or a liquid crystal display screen.

It should be noted that some or all functions of the display device 24 may also be implemented by a host computer. That is, a urea pump diagnosis interface corresponding to the type of the urea pump is displayed on the host computer to realize diagnosis of the urea pump.

In some embodiments, as shown in FIG. 3, the detection circuit 22 may be composed of a reference output unit 221 and a detection node 222.

The reference output unit 221 is configured to provide a reference voltage or a reference current to the identification circuit. The reference voltage or current is a voltage or current that has good stability and fluctuates only within a narrow range.

The detection node 222 is a node for acquiring a detection value related to the identification circuit. The detection node is connected to the identification circuit and is a sampling node that collects detection values. Through the cooperation of the reference output unit 221 and the detection node 222, the detection value is obtained.

In other embodiments, in order to improve detection accuracy and accuracy, as shown in FIG. 3, the urea pump diagnostic instrument may further include a signal processing circuit 25.

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.

This processing refers to a pre-processing process for the detection value, and it may specifically use appropriate processing according to actual conditions, including but not limited to noise reduction, down sampling, or signal mode conversion (such as analog-to-digital conversion). Through the above-mentioned pre-processing, the accuracy of the detection value can be improved, so as to better realize the automatic identification of the urea pump model.

The controller 23 determines the type of the urea pump corresponding to the processed detection value according to the corresponding relationship between the known detection value and the type of the urea pump, and realizes the automatic identification of the type of the urea pump.

FIG. 4 is a structure of a resistance detection circuit that can be specifically adopted by the detection circuit. However, those skilled in the art can understand that other detection circuits can also be set or adopted according to the needs of the actual situation, and the detection value can reflect or measure the resistance value of the identification resistance, and is not limited to the detection circuit shown in FIG. .

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 providing a constant current and having an output that is 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 accuracy requirements, constant current magnitude, etc.). In this embodiment, the constant current source 221 is implemented based on a stable DC voltage VCC.

The constant current source 221 is connected to the wiring harness interface 21. Specifically, it may be connected to one of the pins of the wiring harness interface 21 so as to output a constant reference current at the connection pin.

In this embodiment, the pin corresponds to a connection line in which a marking resistor is embedded in the connection harness. Therefore, when the connection wiring harness is connected to the connection pin, the reference current I output by the constant current source 221 will pass through the branch where the identification resistor Rn is located and form a corresponding voltage.

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 voltage value formed by the identification resistor Rn under the reference current is equal to the voltage value of the detection node 222.

The controller 23 may be connected to the detection node 222 and sample the detection node 222 to obtain a voltage detection value. Because the reference current output by the constant current source 221 is unchanged. Therefore, the magnitude of the voltage detection value actually depends on the magnitude of the resistance value of the identification resistor Rn.

After the controller 23 obtains the voltage detection value, it can determine the resistance value of the identification resistance according to the relationship between the voltage detection value and the resistance value of the identification resistance to uniquely determine the specific model of the urea pump.

The correspondence between the resistance value of the identification resistor and the urea pump model can be recorded in a correspondence table and stored in the memory of the urea pump diagnostic instrument. The controller 23 can call the corresponding table recorded in the memory to determine the specific model of the urea pump according to the detection value.

Of course, the correspondence table may also be stored in the memory of the diagnostic host computer, and the diagnostic host computer directly determines the type n of the urea pump according to the detection value provided by the urea pump diagnostic instrument.

FIG. 5 is a detection circuit provided by 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 source VCC.

The voltage dividing circuit 221 is respectively connected to the power supply and the wiring harness interface, and is configured to output a reference voltage at one of the connection pins of the wiring harness interface to provide a reference voltage for the identification circuit.

In this embodiment, the voltage dividing circuit 221 is implemented by a voltage stabilizing circuit having a specific resistance value. The voltage dividing resistor is connected in series with the identification circuit.

The controller 23 may be connected to the detection node 222 and sample the detection node 222 to obtain a voltage detection value. Because the resistance value of the voltage dividing circuit 221 does not change. Therefore, the magnitude of the voltage detection value actually depends on the magnitude of the resistance value of the identification resistor Rn.

After acquiring the voltage detection value, the controller 23 can determine the resistance value of the identification resistance based on the relationship between the voltage detection value and the resistance value of the identification resistance to uniquely determine the specific model of the urea pump.

Corresponding to the urea pump diagnostic instrument disclosed in the above embodiment, the embodiment of the present invention further provides a type detection of the urea pump.

As shown in FIG. 6, after the urea pump is connected through a connection harness corresponding to the urea pump, the method for detecting the type of the urea pump may include the following steps:

610. Obtain a detection value related to an identification circuit embedded in the connection harness.

620. Determine the type of the urea pump connected to the connection harness corresponding to the detected value according to the correspondence between the detected 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 between the urea pump model and the model. Therefore, the detection value can be used as an identification to determine the model of the urea pump.

630. Display a urea pump diagnostic function interface corresponding to the type of the urea pump.

The urea pump diagnostic function interface is an operation interactive interface. On this operation interaction interface, the diagnostic instrument can be controlled to perform one or more diagnostic operations.

In addition, the urea pump model obtained automatically by the urea pump diagnostic instrument will also be uploaded to the diagnostic host computer. After receiving the specific model information of the urea pump currently connected, the diagnostic host computer may select a software application program matching the urea pump and issue a corresponding diagnostic operation instruction.

In some embodiments, 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 may further include: controlling the detection circuit to the The identification circuit provides a reference voltage or a reference current.

Correspondingly, step 610 specifically includes: acquiring detection values of the two ends of the identification circuit. The detection value may be a voltage value generated by the identification circuit under a reference current or a voltage value generated under a reference voltage.

Specifically, when the detection circuit includes a power source and a voltage dividing circuit, the power source is controlled to provide a reference voltage for the voltage dividing circuit and the identification circuit. Alternatively, when the detection circuit includes a constant current source, the constant current source in the detection circuit is controlled to work so that a reference current generated by the constant current source passes through the identification circuit.

In other embodiments, after step 610, the method for automatic diagnosis of a model may further include: processing the detection value to obtain a processed detection value. Then, according to the correspondence between the detected value and the model of the urea pump, the model of the urea pump connected to the connection harness corresponding to the processed detected value is determined.

By applying the urea diagnostic apparatus and host computer provided in the above embodiments, a universal urea pump diagnostic system can be set up, which is applicable to the diagnostic operations of all different urea pumps. In actual use, the urea pump diagnostic instrument is connected to the urea pump through a connection harness. After the connection, the urea pump diagnostic instrument detects the identification circuit embedded in the connection harness of the urea pump through a built-in detection circuit, thereby determining the type of the urea pump and automatically detecting the type of the urea pump.

The detection result of the urea pump is fed back from the urea pump diagnosis to the diagnostic host computer, and the diagnostic host computer intelligently operates the urea pump corresponding model.

In summary, the universal urea pump diagnostic system provided by the embodiment of the present invention realizes automatic detection of the urea pump model in a simple hardware implementation manner, and can be widely applied to all types of urea pumps. The automatic detection of the urea pump model is helpful to improve the efficiency of detection and diagnosis, and is convenient for maintenance personnel to operate. In addition, the accuracy of automatic detection is high, which will not cause problems such as damage to the urea pump due to mismatch of operation instructions and models.

Those skilled in the art should further realize that each step of the exemplary data transmission control method described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two, in order to clearly Explain the interchangeability of hardware and software. In the above description, the composition and steps of each example have been described generally in terms of functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. The computer software may be stored in a computer-readable storage medium. When the program is executed, the program may include the processes of the foregoing methods. The storage medium may be a magnetic disk, an optical disk, a read-only storage memory, or a random storage memory.

Finally, it should be noted that the above embodiments are only used to describe the technical solution of the present invention, but not limited thereto. Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined. The steps can be implemented in any order and there are many other variations of the different aspects of the invention as described above, for the sake of brevity they are not provided in the details; although the invention has been described in detail with reference to the foregoing embodiments, it is common in the art The skilled person should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the implementation of the present invention. Examples of technical solutions.

Claims

A method for identifying the type of a urea pump, comprising:

After connecting the urea pump through a connection harness corresponding to the urea pump, obtaining a detection value related to an identification circuit embedded in the connection harness;

Determining the model of the urea pump connected to the connection harness corresponding to the detected value according to the correspondence between the detected value and the model of the urea pump;

A urea pump diagnostic function interface corresponding to the model of the urea pump is displayed.
The method according to 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 a detection value related to an identification circuit embedded in the connection harness includes:

Acquire detection values at the two ends of the identification circuit.
The method according to 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 includes a constant current source, controlling the constant current source in the detection circuit to work so that a reference current generated by the constant current source passes through the identification circuit.
The method according to 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 includes a power source and a voltage dividing circuit, controlling the power source to provide a reference voltage for the voltage dividing circuit and the identification circuit.
The method according to any one of claims 1-4, wherein after the acquiring 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 to the connection harness corresponding to the detected value according to the correspondence between the detected value and the model of the urea pump includes:

According to the correspondence between the detected value and the model of the urea pump, the model of the urea pump connected to the connection harness corresponding to the processed detected value is determined.
A urea pump diagnostic instrument, comprising:

A wire harness interface, which is used to connect a connection wire harness of a urea pump; an identification circuit is embedded in the connection wire harness;

A detection circuit, which is connected to the wiring harness interface and configured to obtain a detection value related to the identification circuit;

A controller, which is connected to the detection circuit and is configured to determine the type of the urea pump corresponding to the detection value according to the correspondence between the detection value and the type of the urea pump;

A display device connected to the controller and configured to display a urea pump diagnostic function interface corresponding to the type of the urea pump.
The urea pump diagnostic instrument according to claim 6, wherein the detection circuit comprises: a reference output unit and a detection node;

The reference output unit is configured to provide a reference voltage or a reference current to the identification circuit;

The detection node is configured to obtain a detection value related to the identification circuit.
The urea pump diagnostic instrument according to claim 7, wherein the reference output unit comprises a constant current source;

The constant current source is connected to the wiring harness interface, and is configured to output a reference current at one of the connection pins of the wiring harness interface, so that the reference current passes through the identification circuit.
The urea pump diagnostic apparatus according to claim 7, wherein the reference output unit includes a voltage dividing circuit and a power source;

The voltage dividing circuit is respectively connected to the power supply and the wiring harness interface, and is configured to output a reference voltage at one of the connection pins of the wiring harness interface to provide a reference voltage for the identification circuit.
The urea pump diagnostic instrument according to any one of claims 6 to 9, wherein the urea pump diagnostic instrument further comprises a signal processing circuit, and the signal processing circuit is connected to the controller and configured to connect the controller to the controller. The detection value output by the detection circuit is processed to generate a processed detection value;

The controller is configured to determine the type of the urea pump corresponding to the processed detection value according to the correspondence between the detected value and the type of the urea pump.
A general-purpose urea pump diagnostic system, characterized in that it includes: a urea pump, a urea pump diagnostic instrument, and a host computer;

The urea pump includes a connection harness; the urea pump is connected to the urea pump diagnostic instrument through the connection harness, and the urea pump diagnostic instrument is communicatively connected to the host computer;

An identification circuit is provided in the connection 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 back the model of the urea pump to the host computer; the host computer according to the model of the urea pump, A corresponding diagnostic command operation is performed on the urea pump.