CN109184862A - Type identifier method, urea pump diagnostic equipment and its diagnostic system of urea pump - Google Patents
Type identifier method, urea pump diagnostic equipment and its diagnostic system of urea pump Download PDFInfo
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- CN109184862A CN109184862A CN201811116359.XA CN201811116359A CN109184862A CN 109184862 A CN109184862 A CN 109184862A CN 201811116359 A CN201811116359 A CN 201811116359A CN 109184862 A CN109184862 A CN 109184862A
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- Prior art keywords
- urea pump
- detected value
- circuit
- wiring harness
- model
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
Abstract
The present embodiments relate to a kind of urea pump type identifier method, urea pump diagnostic equipment and its diagnostic systems.The described method includes: obtaining detected value relevant to the marker circuit being embedded in the connection wiring harness after connecting the urea pump by connection wiring harness corresponding with urea pump；According to the corresponding relationship of the model of detected value and urea pump, the model of the urea pump of the corresponding connection wiring harness connection of the detected value is determined；Show urea pump diagnostic function interface corresponding with the model of the urea pump.The urea pump diagnostic equipment can detect automatic urea pump type when connection wiring harness accesses, and be not necessarily to manual hand manipulation, to improve the diagnosis efficiency of urea pump and avoid the situation generation of type identifier mistake.
Description
[technical field]
The present invention relates to mobile unit detection technique field more particularly to a kind of type identifier methods of urea pump, urea
Pump diagnostic instrument and its diagnostic system.
[background technique]
Selective catalytic reduction (SCR) technology is the NO for meeting the diesel engine of the following strict emission regulationXUrge purification techniques
One of, have safety good, the advantages that oil consumption is low, and sulfur tolerance is good.Its working principle is that utilizing urea liquid and NOXOxidation is also
Original reaction, generates N harmless to the human body2, and be discharged into atmosphere.
Wherein, urea pump is the core component of SCR system, and main function is to pump out urea liquid from urea tank,
And urea liquid is transported to by nozzle by conveyance conduit.In actual use, in order to guarantee the reliable operation of urea pump
Property symbol SCR system job requirement, need to demarcate urea pump.The performance of urea pump and the discharge function of engine have close
Cutting link.
The work such as maintenance, calibration and diagnosis to urea pump often rely on specific urea pump diagnostic equipment or diagnosis
The equipment such as system.But for different diesel engine vehicles, the model of the urea pump used is usually different.Therefore, exist
User must be allowed to determine the model of urea pump on urea diagnostic equipment in advance by way of artificial selection when diagnosis detection.
If there is the case where model is falsely dropped, diagnostic operation mistake will lead to, be easy to cause urea pump or diagnostic equipment
It damages.
[summary of the invention]
In order to solve the above-mentioned technical problem, the embodiment of the present invention provides a kind of urea pump type automatic identification, avoids artificial
Urea pump type identifier method, urea pump diagnostic equipment and its diagnostic system of type selecting mistake.
In order to solve the above technical problems, the embodiment of the present invention is the following technical schemes are provided: a kind of model identification of urea pump
Method.The model identification method include: after connecting the urea pump by connection wiring harness corresponding with urea pump obtain with it is embedding
Enter the relevant detected value of marker circuit in the connection wiring harness；According to the corresponding relationship of the model of detected value and urea pump, really
Determine the model of the urea pump of the corresponding connection wiring harness connection of the detected value；It shows corresponding with the model of the urea pump
Urea pump diagnostic function interface.
Optionally, when one end of the marker circuit is connect with the detection circuit in urea pump diagnostic equipment, the mark is electric
When the other end on road is connected to ground, the method also includes:
It controls the detection circuit and provides reference voltage or reference current to the marker circuit；The acquisition and insertion institute
State the relevant detected value of marker circuit in connection wiring harness, comprising: obtain the detected value at the both ends of the marker circuit.
Optionally, the control detection circuit provides reference voltage or reference current to the marker circuit, comprising:
When the detection circuit includes constant-current source, the constant-current source work in the detection circuit is controlled, so that the constant-current source generates
Reference current pass through the marker circuit.
Optionally, the control detection circuit provides reference voltage or reference current to the marker circuit, comprising:
When the detection circuit includes power supply and bleeder circuit, controlling the power supply is that the bleeder circuit and the marker circuit mention
For reference voltage.
Optionally, after acquisition detected value relevant to the marker circuit being embedded in the connection wiring harness, the side
Method further include: the detected value is handled, with the detected value that obtains that treated；
The corresponding relationship of the model according to detected value and urea pump determines the corresponding connecting line of the detected value
The model of the urea pump of beam connection, comprising: according to the corresponding relationship of the model of detected value and urea pump, determination is described, and treated
The model of the urea pump of the corresponding connection wiring harness connection of detected value.
In order to solve the above technical problems, the embodiment of the present invention is also the following technical schemes are provided: a kind of urea pump diagnostic equipment.Its
In, the urea diagnostic equipment includes: wiring harness interface, and the wiring harness interface is used to connect the connection wiring harness of urea pump；The connection
Marker circuit is embedded on harness；Detection circuit, the detection circuit are connect with the wiring harness interface, for obtaining the mark
The relevant detected value of circuit；Controller, the controller are connect with the detection circuit, for according to detected value and urea pump
The corresponding relationship of model determines the model of the corresponding urea pump of the detected value；Show equipment, the display equipment and the control
Device connection processed, for showing urea pump diagnostic function interface corresponding with the model of the urea pump.
Optionally, the detection circuit includes: benchmark output unit and detection node；The benchmark output unit is used for
Reference voltage or reference current are provided to the marker circuit；The detection node is related to the marker circuit for obtaining
Detected value.
Optionally, the benchmark output unit includes constant-current source；The constant-current source is connect with the wiring harness interface, is used for
One of connection pin outputting reference electric current of the wiring harness interface, so that the reference current passes through the marker circuit.
Optionally, the benchmark output unit includes bleeder circuit and power supply；The bleeder circuit respectively with the power supply
It is connected with the wiring harness interface, is the mark for one of connection pin outputting reference voltage in the wiring harness interface
Know circuit and reference voltage is provided.
Optionally, the urea pump diagnostic equipment further includes signal processing circuit, the signal processing circuit and the control
Device connection, the detected value for export to the detection circuit handles, generation treated detected value；The controller is used
In the corresponding relationship according to detected value and the model of urea pump, the type of treated the corresponding urea pump of detected value is determined
Number.
In order to solve the above technical problems, the embodiment of the present invention is also the following technical schemes are provided: a kind of universal urea pump is examined
Disconnected system.The universal urea pump diagnostic system includes: urea pump, urea pump diagnostic equipment and host computer；
The urea pump includes a connection wiring harness；The urea pump passes through the connection wiring harness and the urea pump diagnostic equipment
Connection, the urea pump diagnostic equipment and the host computer communicate to connect；Mark resistance is provided in the connection wiring harness；The mark
The resistance value for knowing resistance is corresponding with the model of the urea pump；The urea pump diagnostic equipment is automatic to detect according to the mark resistance
The model of the urea pump, and feed back to the host computer model of the urea pump；The host computer is according to the urea pump
Model, corresponding diagnostic command is executed to the urea pump and is operated.
Compared with prior art, the urea pump model identification of the offer of the embodiment of the present invention and recognition methods can be even
Wiring beam realizes that the detection of urea pump type avoids the occurrence of urea pump type without carrying out manual hand manipulation when accessing automatically
Identify the problem of mistake.Testing result of the host computer based on urea pump diagnostic equipment can execute corresponding diagnosis detection operation, fit
It should be detected in the diagnosis of the urea pump of a variety of different models, testing result is accurate, will not cause urea pump or diagnostic instrments
Damage.
[Detailed description of the invention]
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the schematic diagram of the urea pump diagnostic system of the embodiment of the present invention；
Fig. 2 is the structural block diagram of diagnosis host computer provided in an embodiment of the present invention；
Fig. 3 is the structural block diagram of urea pump provided in an embodiment of the present invention and urea pump diagnostic equipment；
Fig. 4 is the circuit diagram of urea pump diagnostic equipment provided in an embodiment of the present invention；
Fig. 5 be another embodiment of the present invention provides urea diagnostic equipment circuit diagram；
Fig. 6 is the method flow diagram of the type identifier method of urea pump provided in an embodiment of the present invention.
[specific embodiment]
To facilitate the understanding of the present invention, in the following with reference to the drawings and specific embodiments, the present invention will be described in more detail.
It should be noted that be expressed " being fixed on " another element when element, it can directly on the other element or therebetween
There may be one or more elements placed in the middle.When an element is expressed " connection " another element, it, which can be, directly connects
It is connected to another element or there may be one or more elements placed in the middle therebetween.Term " on " used in this specification,
The orientation or positional relationship of the instructions such as "lower", "inner", "outside", " bottom " is to be based on the orientation or positional relationship shown in the drawings, only
It is that for the convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have specifically
Orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " the
Two " " thirds " etc. are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Unless otherwise defined, technical and scientific term all used in this specification is led with technology of the invention is belonged to
The normally understood meaning of the technical staff in domain is identical.Used term is only in the description of the invention in this specification
The purpose of description specific embodiment is not intended to the limitation present invention.Term "and/or" used in this specification includes one
Any and all combinations of a or multiple relevant listed items.
In addition, as long as technical characteristic involved in invention described below difference embodiment is not constituted each other
Conflict can be combined with each other.
SCR technology according to nitrogen hydrogen reduction basic principle, the aqueous solution of urea for being 32.5% using mass fraction as reducing agent,
(delivery temperature of diesel engine has substantially met SCR institute generally at 200-500 DEG C under the catalytic action of catalyst surface coating
The Active pharmaceutical of the catalytic component based on vanadium of use), by the NO in exhaust gasXIt is reduced into N2And H2O。
The urea pump of diesel engine is the important component of urea liquid injection metering system, and main function is by urea
Urea liquid in case is transported to injection unit after keeping certain pressure to pump out, to meet injection metering system to urea liquid
Flow and pressure requirement.The discharge function of engine depends greatly on calibration and urine to urea injection system
The correlated performance of element pump.
Each diesel engine requires the urea pump with specific model due to the difference of its practical duty parameter etc..That is, it is every
A diesel engine usually has the urea pump of specific model.Urea sprays metering system as the important of control exhaust emissions of diesel engine
Means have played obvious action for improving environmental pollution caused by due to exhaust emissions.
The operation of maintenance and fault detection for the ease of diesel engine etc., there is an urgent need to occur to integrate in the prior art
The universal checkout and diagnosis equipment of a variety of diesel engine models.
Fig. 1 is the application scenarios of urea pump diagnostic system provided in an embodiment of the present invention.As shown in Figure 1, the urea pump
Diagnostic system may include: diagnosis host computer 10, urea pump diagnostic equipment 20 and urea pump 30.
The diagnosis host computer 10 can be it is any kind of, to send the electrometer of one or more operational order
Calculate platform.The memory that the electronic computing platform can have logical operation core and be used in combination, it is specific to run
Software application or other computer software programs.
The urea pump diagnostic equipment 20 is slave computer, the urine that communication connection is established between the diagnosis host computer 10
Plain pump diagnostic instrument 20 is directly connected to by connection wiring harness and the urea pump 30 of diagnosis to be detected, in transmitting as data
It is situated between, the device status data obtained will be read after the processing of suitable data format, feed back to the diagnosis host computer (example
The diagnosis host computer 10 is provided to equipment simulating data-signal that acquisition obtains is converted to digital signal).
For different vehicles, uses or corresponding urea pump 30 is not also identical.In embodiments of the present invention, it is
Statement is easy, indicates urea pump 30 used in different automobile types with " model of urea pump ".As shown in Figure 1, different for n
Vehicle will use the urea pump 30 of n different model.
The urea pump 30 of each model or vehicle is due to being designed or demarcating for specific diesel engine vehicle.
Therefore, each urea pump 30 requires to carry out using corresponding software application (can usually be selected by diagnosis host computer 10)
Diagnosis detection operation.
When universal as one urea pump diagnostic equipment, the n different urea pumps 30 can pass through urea pump
30 connection wiring harnesses drawn are connect with urea pump diagnostic equipment 20.Urea pump diagnostic equipment 20 can use under the control of host computer
The detection to match with the model (or vehicle) of urea pump 30 or diagnostic operation.
Usual, after urea pump diagnostic equipment 20 is connect with urea pump 39, the type of urea pump is voluntarily selected by testing staff
Number n.Then, corresponding diagnosis is made by urea pump diagnostic equipment or host computer accordingly and executes operation.
The control of operator but mode manually-operated in this way places one's entire reliance upon, is very easy to type selecting mistake occur
The problem of, reliability is not high.For example, operator may have erroneous judgement, the diesel engine that the judgement of mistake is connect with diagnostic equipment
Urea pump type, so as to cause the instruction for issuing mistake to urea pump diagnostic equipment.Alternatively, mistake may also have been clicked due to carelessness
Urea pump type n accidentally.
Once there is the situation of urea pump type selecting mistake, the diagnosis that urea pump diagnostic equipment or corresponding host computer carry out is held
Row operation easily causes the damage of urea pump or urea pump diagnostic equipment.
Fig. 2 is the structural block diagram of diagnosis host computer 10 provided in an embodiment of the present invention.As shown in Fig. 2, the diagnosis host computer
10 may include: processor 11, memory 12, input unit 13, display screen 14 and communication module 15.
Between the processor 11, memory 12, input unit 13, display screen 14 and communication module 15 by bus or
The mode of other connections establishes any communication connection between the two.
Processor 11 is any kind of single thread or multithreading, the processing with one or more processing core
Device, as the control core of diagnosis host computer 10, for obtaining data, executing logical operation function and issuing calculation process knot
Fruit.
A kind of non-volatile computer readable storage medium storing program for executing of the conduct of memory 12, a for example, at least disk memory,
Flush memory device, the distributed storage device remotely located relative to processor 11 or other non-volatile solid state memory parts.
Memory 12 can have program storage area, for storing non-volatile software program, non-volatile computer can
Program and module are executed, is called for processor 11 so that processor 11 executes one or more method and step.Memory 12
There can also be data storage area, the calculation process result of output is issued to storage processor 12.
Input unit 13 is the user interaction device for acquiring user input instruction, such as mouse, keyboard, touch panel
Or other input equipments.Input unit 13 receives the number or the information such as character of user's input, be supplied to processor 11 with
Processor 11 is set to execute corresponding control instruction.
Display screen 14 is in a specified pattern, the output equipment of corresponding data being shown to user.It, which can be, appoints
Display, such as light-emitting diode display, crt display unit or the LCD display of what type.Display screen 24 is received by processor
The display information of 21 outputs, and be converted to image information accordingly and be supplied to user.
During carrying out the diagnostic operation of urea pump, user is set by one or more kinds of input equipments and output
It is standby, instruction is sent to the diagnosis host computer 10 or knows the feedback result of diagnostic operation.
Communication module 15 is communicated to connect for establishing with urea pump diagnostic equipment 20, and the functional module of physical channel is provided.
Communication module 15 can be any kind of wireless perhaps wire communication module such as WiFi module or bluetooth module etc..Its
In, communication module 15 may include the devices such as antenna, not be described in detail herein.
The urea pump diagnostic equipment 20 can add one on the basis of traditional diagnostic equipment according to the needs of actual conditions
Or multiple functional modules, to realize corresponding function.For example, corresponding hardware module can be set to execute or realize
Urea pump type identifier method provided in an embodiment of the present invention.
Using urea pump type identifier method provided in an embodiment of the present invention, can by above urea pump type identifier or
Person's deterministic process becomes the form detected automatically, ensures that the accuracy and reliability of urea pump type identifier.
Fig. 3 is the urea pump provided in an embodiment of the present invention being used cooperatively and urea pump diagnostic equipment.Using as shown in Figure 3
Urea pump and urea pump diagnostic equipment when, may be implemented urea pump diagnostic equipment for urea pump 30 model it is automatic detection and
Identification, it is ensured that diagnosis deterministic process or operation and the model of the urea pump 30 match.
As shown in figure 3, the urea pump 30 includes urea pump main body 31 and connecting line in urea pump side to be detected
Beam 32.The urea pump main body 31 is the pump main body for executing urea pumping function.Its wherein one as diesel engine SRC device
Part, to reduce exhaust emission.
The connection wiring harness 32 is the harness for a plurality of connecting line composition drawn from urea pump main body 31.The connecting line
Beam 32 may include appropriate number of connecting line, to transmit parameter relevant to 30 operation conditions of urea pump or control
Instruction.
In further embodiments, the connection wiring harness 32 be also used as one it is independent relative to the urea pump 30
Component is connect with the urea pump and the urea pump diagnostic equipment respectively by corresponding connecting interface.
In order to mark the model of different urea pumps 30, corresponding marker circuit can be embedded in the connection wiring harness.It should
Marker circuit can be made of one or more electronic component, to feed back a specific detected value.Each detected value is only
One it is corresponding with a kind of model of urea pump, play the role of similar identity label, detected automatically as urea pump type
Basis.
For example, the marker circuit can simply be set as mark resistance Rn.Mark resistance RnIt is embedded into the connecting line
In the arbitrary connecting line of beam, to the mark as 30 model of urea pump.As shown in figure 3, the mark resistance RnIt can access
A wherein connecting line for the connection wiring harness, and pass through another connecting line ground connection.Wherein, each urea pump n has
One unique corresponding mark resistance Rn。
Please continue to refer to Fig. 3, in the urea pump diagnostic equipment side of detection 30 model of urea pump automatically, the urea diagnostic equipment
20 may include: wiring harness interface 21, detection circuit 22, controller 23 and display equipment 24.
The wiring harness interface 21 is the interface for connecting with connection wiring harness.Appoint for example, the wiring harness interface 21 can be
The interface 21 of what type, the stitch comprising respective numbers realize that quick plug type is connect between connection wiring harness.
The detection circuit 22 is connect with the wiring harness interface, the marker circuit being embedded in for detecting the connection wiring harness
Detected value.The detected value can be the electrical parameters such as voltage value, current value or resistance value.For example, it may be marker circuit
Total resistance value (resistance value when i.e. marker circuit is considered as a resistance) the either corresponding voltage value of total resistance value or electric current
Value etc..
The detection circuit 22 can have any suitable detection circuit structure, above-mentioned a kind of or more to obtain
Kind detected value.
The controller 23 is the control centre of entire urea diagnostic equipment, can be selected according to actual needs corresponding micro-
Processor or single-chip microcontroller etc. control chip.The controller 23 can be received there are the information connecting with the detection circuit to be drawn
Foot, the detected value obtained for obtaining the detection circuit acquisition.
As described above, the detected value is specifically related to the testing principle of the structure of detection circuit and use that use.Example
Such as, as shown in figure 3, the detected value can be the analog quantitys such as the voltage or current of resistance change for following mark resistance.
The controller 23 can determine that the harness connects after receiving the detected value according to the detected value
The model of the urea pumps of 21 connection of mouth, to realize the automatic detection of the model for urea pump.
Display equipment 24 is connect with the controller 23, for showing and the urine under the control of the controller 23
The model corresponding urea pump diagnostic function interface of element pump.
The display equipment 24 can be corresponding for showing to user using the image interactive device of any model or principle
Operating interactive interface, including but not limited to LED, LCD or liquid crystal display.
It should be noted that some or all of function of the display equipment 24 can also be realized by host computer.Also that is,
Show urea pump Diagnostics Interfaces corresponding with the model of the urea pump, on host computer to realize the diagnosis to urea pump.
In some embodiments, as shown in figure 3, the detection circuit 22 can be saved by benchmark output unit 221 and detection
222 composition of point.
Wherein, the benchmark output unit 221 is used to provide reference voltage or reference current to the marker circuit.Institute
It states reference voltage or reference current is that a stability is preferable, the voltage or current only fluctuated in relatively narrow range.
Detection node 222 is the node for obtaining detected value relevant to the marker circuit.The detection node and mark
Know circuit connection, is the sampling node of an acquisition testing value.Pass through the benchmark output unit 221 and detection node 222
Cooperation, realizes the acquisition of the detected value.
In further embodiments, in order to improve detection accuracy and accuracy, as shown in figure 3, the urea pump diagnostic equipment
It can also include signal processing circuit 25.
The signal processing circuit 25 is arranged between detection circuit 22 and controller 23, for defeated to the detection circuit
Detected value out is handled, and treated detected value is generated.
The processing refers to the preprocessing process carried out to detected value, can specifically need according to the actual situation using suitable
Processing, including but not limited to noise reduction, down-sampled or signal mode conversion (such as analog-to-digital conversion).It can by above-mentioned pretreatment
To improve the accuracy of detected value, to preferably realize the automatic identification of urea pump type.
The controller 23 is then according to the corresponding relationship of the model of known detected value and urea pump, after determining the processing
The corresponding urea pump of detected value model, realize the model automatic identification of urea pump.
Fig. 4 is the structure for the resistance detecting circuit that the detection circuit can specifically use.But those skilled in the art
It is understood that can also be arranged or using other detection circuits according to the needs of actual conditions, by detected value come
The resistance value of reflection or measurement mark resistance, and it is not limited to detection circuit shown in Fig. 4.
As shown in figure 4, the benchmark output unit 221 may include constant-current source.The constant-current source 221 can be any energy
Constant current is enough provided, the circuit structure not influenced substantially by external loading is exported.Those skilled in the art can be according to reality
The requirement (such as required precision, constant current size) of application, selects various types of constant-current source circuit.In the present embodiment
In, the constant-current source 221 is realized based on stable DC voltage VCC.
The constant-current source 221 is connect with the wiring harness interface 21.Specifically, it can be with the wiring harness interface 21 wherein
One pin connection, to export constant reference current at the connection pin.
In the present embodiment, it is embedded in corresponding to the connecting line of mark resistance in the pin and the connection wiring harness.As a result,
When the connection wiring harness and the connection pin connect, the reference current I that constant-current source 221 exports will be by mark resistance RnInstitute
Branch, and form corresponding voltage.
Detection node 222 is the voltage node that the pin connected by the constant-current source 221 is drawn.As shown in Fig. 2, mark
Know resistance RnThe voltage value formed under the reference current is equal with the voltage value of the detection node 222.
The controller 23 can be connect with the detection node 222, be sampled to the detection node 222, thus
Obtain voltage detecting value.Since the reference current that constant-current source 221 exports is constant.Therefore, the size of the voltage detecting value is practical
It is upper to depend on the mark resistance RnResistance value size.
The controller 23 according to voltage detecting value and can identify resistance after obtaining the voltage detecting value
Relationship between resistance value determines the resistance value of mark resistance to uniquely determine the concrete model of the urea pump.
It is described mark resistance resistance value and the urea pump type between corresponding relationship can recorde corresponding table simultaneously
It is stored in the memory of urea pump diagnostic equipment.The controller 23 calls the correspondence table recorded in the memory can basis
Detected value determines the concrete model of urea pump.
Certainly, the corresponding table also can store it is described diagnosis host computer memory in, by diagnosis host computer according to
The detected value that urea pump diagnostic equipment provides, directly determines the model n of the urea pump.
Fig. 5 be another embodiment of the present invention provides detection circuit.As shown in figure 5, the benchmark output unit 221 can
To include bleeder circuit 221 and power supply VCC.
The bleeder circuit 221 is connect with the power supply and the wiring harness interface respectively, in the wiring harness interface
One of connection pin outputting reference voltage, provides reference voltage for the marker circuit.
In the present embodiment, which is realized with the voltage regulator circuit with specific resistance value.The divider resistance
It connects with marker circuit.
The controller 23 can be connect with the detection node 222, be sampled to the detection node 222, thus
Obtain voltage detecting value.Since the resistance value of bleeder circuit 221 is constant.Therefore, the size of the voltage detecting value actually takes
Certainly in the mark resistance RnResistance value size.
The controller 23 according to voltage detecting value and can identify resistance after obtaining the voltage detecting value
Relationship between resistance value determines the resistance value of mark resistance to uniquely determine the concrete model of the urea pump.
Corresponding with urea pump diagnostic equipment disclosed in above-described embodiment, the embodiment of the present invention still further provides one kind
The model of urea pump detects.
As shown in fig. 6, after connecting the urea pump by connection wiring harness corresponding with urea pump, the model of the urea pump
Detection method may include steps of:
610, detected value relevant to the marker circuit being embedded in the connection wiring harness is obtained.
620, according to the corresponding relationship of the model of detected value and urea pump, the corresponding connecting line of the detected value is determined
The model of the urea pump of beam connection.
The detected value can be the electrical data of reflection marker circuit, there is one-to-one close between urea pump type
System.Therefore, which can be used as a kind of identity, to determine the model of urea pump.
630, urea pump diagnostic function interface corresponding with the model of the urea pump is shown.
Urea pump diagnostic function interface is an operating interactive interface.It can control diagnostic equipment on the operating interactive interface
Execute one or more diagnostic operation.
In addition, by urea pump diagnostic equipment, detected urea pump type can also be uploaded to the diagnosis host computer automatically
In.The diagnosis host computer can choose and the urea after receiving the concrete model information of the urea pump currently connected
The software application to match is pumped, corresponding diagnostic operation instruction is issued.
In some embodiments, when one end of the marker circuit is connect with the detection circuit in urea pump diagnostic equipment, institute
When stating the other end of marker circuit and being connected to ground, the method can also include: that the control detection circuit is electric to the mark
Road provides reference voltage or reference current.
Correspondingly, step 610 specifically includes: obtaining the detected value at the both ends of the marker circuit.The detection
The voltage value that value can be the voltage value that marker circuit generates under reference current or generate under reference voltage.
Specifically, controlling the power supply is the bleeder circuit when the detection circuit includes power supply and bleeder circuit
Reference voltage is provided with the marker circuit.Either, when the detection circuit includes constant-current source, the detection circuit is controlled
In constant-current source work so that the constant-current source generate reference current pass through the marker circuit.
In further embodiments, after step 610, the model automatic diagnosis method can also include: to described
Detected value is handled, with the detected value that obtains that treated.Then, according to the corresponding relationship of the model of detected value and urea pump,
The model of the urea pump for the corresponding connection wiring harness connection of detected value that treated described in determining.
Using urea diagnostic equipment provided by the above embodiment and host computer, a universal urea pump diagnostic system can be set up
System, the diagnostic operation suitable for all different urea pumps.In actual use, the urea pump diagnostic equipment passes through connecting line
Beam is connect with the urea pump.After connection, urea pump diagnostic equipment determines the urea pump by built-in detection circuit, detection
The marker circuit that is embedded in of connection wiring harness, so that it is determined that the model of urea pump, realizes the automatic detection of urea pump type.
The testing result of urea pump by the urea pump diagnostic feedback into the diagnosis host computer, the diagnosis host computer
Just intelligence corresponds to vehicle for urea pump and is operated.
In conclusion universal urea pump diagnostic system provided in an embodiment of the present invention, with simple hardware implementation mode
The automatic detection for urea pump type is realized, all types of urea pumps can be widely suitable for.Urea pump type
Automatic detection is conducive to improve detection and diagnosis efficiency, and personnel easy to repair operate.And the accuracy rate detected automatically is high,
The problems such as urea pump caused by operational order and model mismatch because damaging is not will lead to.
Those skilled in the art should further appreciate that, described in conjunction with the examples disclosed in this document to show
Each step of the data transfer control method of example property can be come real with the combination of electronic hardware, computer software or the two
It is existing, in order to clearly illustrate the interchangeability of hardware and software, generally described in the above description according to function
Each exemplary composition and step.These functions are implemented in hardware or software actually, depending on the specific of technical solution
Using and design constraint.
Those skilled in the art can use different methods to achieve the described function each specific application, but
It is that such implementation should not be considered as beyond the scope of the present invention.The computer software can be stored in computer-readable storage and be situated between
In matter, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be
Magnetic disk, CD, read-only memory or random access memory etc..
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；At this
It under the thinking of invention, can also be combined between the technical characteristic in above embodiments or different embodiment, step can be with
It is realized with random order, and there are many other variations of different aspect present invention as described above, for simplicity, they do not have
Have and is provided in details；Although the present invention is described in detail referring to the foregoing embodiments, the ordinary skill people of this field
Member is it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of skill
Art feature is equivalently replaced；And these are modified or replaceed, each reality of the present invention that it does not separate the essence of the corresponding technical solution
Apply the range of a technical solution.
Claims (11)
1. a kind of type identifier method of urea pump characterized by comprising
After connecting the urea pump by connection wiring harness corresponding with urea pump, obtain and the mark in the insertion connection wiring harness
The relevant detected value of circuit；
According to the corresponding relationship of the model of detected value and urea pump, the corresponding connection wiring harness connection of the detected value is determined
The model of urea pump；
Show urea pump diagnostic function interface corresponding with the model of the urea pump.
2. the method according to claim 1, wherein when in one end of the marker circuit and urea pump diagnostic equipment
Detection circuit connection, when the other end of the marker circuit is connected to ground, the method also includes:
It controls the detection circuit and provides reference voltage or reference current to the marker circuit；
Acquisition detected value relevant to the marker circuit in the insertion connection wiring harness, comprising:
Obtain the detected value at the both ends of the marker circuit.
3. according to the method described in claim 2, it is characterized in that, the control detection circuit is mentioned to the marker circuit
For reference voltage or reference current, comprising:
When the detection circuit includes constant-current source, the constant-current source work in the detection circuit is controlled, so that the constant-current source
The reference current of generation passes through the marker circuit.
4. according to the method described in claim 2, it is characterized in that, the control detection circuit is mentioned to the marker circuit
For reference voltage or reference current, comprising:
When the detection circuit includes power supply and bleeder circuit, controlling the power supply is the bleeder circuit and mark electricity
Road provides reference voltage.
5. method according to claim 1-4, which is characterized in that in the acquisition and the insertion connection wiring harness
The relevant detected value of marker circuit after, the method also includes:
The detected value is handled, with the detected value that obtains that treated；
The corresponding relationship of the model according to detected value and urea pump determines that the corresponding connection wiring harness of the detected value connects
The model of the urea pump connect, comprising:
According to the corresponding relationship of the model of detected value and urea pump, treated the corresponding connecting line of detected value is determined
The model of the urea pump of beam connection.
6. a kind of urea pump diagnostic equipment characterized by comprising
Wiring harness interface, the wiring harness interface are used to connect the connection wiring harness of urea pump；Mark electricity is embedded on the connection wiring harness
Road；
Detection circuit, the detection circuit are connect with the wiring harness interface, for obtaining the relevant detected value of the marker circuit；
Controller, the controller are connect with the detection circuit, for closing according to detected value is corresponding with the model of urea pump
System, determines the model of the corresponding urea pump of the detected value；
Show equipment, the display equipment is connect with the controller, for showing urine corresponding with the model of the urea pump
Plain pump diagnostic function interface.
7. urea pump diagnostic equipment according to claim 6, which is characterized in that the detection circuit includes: that benchmark output is single
Member and detection node；
The benchmark output unit is used to provide reference voltage or reference current to the marker circuit；
The detection node is for obtaining detected value relevant to the marker circuit.
8. urea pump diagnostic equipment according to claim 7, which is characterized in that the benchmark output unit includes constant-current source；
The constant-current source is connect with the wiring harness interface, for one of connection pin outputting reference in the wiring harness interface
Electric current, so that the reference current passes through the marker circuit.
9. urea pump diagnostic equipment according to claim 7, which is characterized in that the benchmark output unit includes bleeder circuit
And power supply；
The bleeder circuit is connect with the power supply and the wiring harness interface respectively, for the wiring harness interface one of them
Pin outputting reference voltage is connected, provides reference voltage for the marker circuit.
10. according to the described in any item urea pump diagnostic equipments of claim 6-9, which is characterized in that the urea pump diagnostic equipment is also
Including signal processing circuit, the signal processing circuit is connect with the controller, the inspection for exporting to the detection circuit
Measured value is handled, and treated detected value is generated；
The controller is used for the corresponding relationship according to the model of detected value and urea pump, determines treated the detected value pair
The model for the urea pump answered.
11. a kind of universal urea pump diagnostic system characterized by comprising urea pump, urea pump diagnostic equipment and upper
Machine；
The urea pump includes a connection wiring harness；The urea pump is connected by the connection wiring harness and the urea pump diagnostic equipment
It connects, the urea pump diagnostic equipment and the host computer communicate to connect；
Marker circuit is provided in the connection wiring harness；The marker circuit has detection corresponding with the model of the urea pump
Value；
The urea pump diagnostic equipment detects the model of the urea pump according to the detected value of the marker circuit automatically, and to institute
State the model that host computer feeds back the urea pump；The host computer executes the urea pump according to the model of the urea pump
Corresponding diagnostic command operation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811116359.XA CN109184862B (en) | 2018-09-25 | 2018-09-25 | Model identification method of urea pump, urea pump diagnostic instrument and diagnostic system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109184862A true CN109184862A (en) | 2019-01-11 |
| CN109184862B CN109184862B (en) | 2020-11-13 |
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| CN201811116359.XA Active 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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| CN (1) | CN109184862B (en) |
| WO (1) | WO2020063672A1 (en) |
Cited By (3)
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| 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 |
| WO2021227647A1 (en) * | 2020-05-09 | 2021-11-18 | 深圳市云伽智能技术有限公司 | Urea pump driving testing apparatus and system |
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Also Published As
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| WO2020063672A1 (en) | 2020-04-02 |
| CN109184862B (en) | 2020-11-13 |
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