CN206903851U - A kind of urea pump detecting system - Google Patents
A kind of urea pump detecting system Download PDFInfo
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- CN206903851U CN206903851U CN201720731521.3U CN201720731521U CN206903851U CN 206903851 U CN206903851 U CN 206903851U CN 201720731521 U CN201720731521 U CN 201720731521U CN 206903851 U CN206903851 U CN 206903851U
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- urea pump
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- urea
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Abstract
The application provides a kind of urea pump detecting system, including：Power module, data acquisition module, pin control circuit and control module, wherein, power module, external power source is connected, power supply is provided for urea pump detecting system；Data acquisition module, the signal wire of each building block of urea pump is connected, for gathering the voltage and/or current value of each building block of the urea pump；Pin control circuit, for connecting the positive pole and negative pole of each building block of the urea pump；Control module, connection pin control circuit, data acquisition module, controlling switch control circuit, data acquisition module action.Utilize the utility model, solve the problems such as existing detecting instrument is cumbersome and measurement accuracy is low, improve the efficiency of urea pump detection and maintenance, simultaneously using the mode controlled motor of frequency conversion, urea pump detecting system is set more accurately and efficiently to realize to urea pump and urea pump component controls, detection and maintenance integration detection.
Description
Technical field
It the utility model is related to automobile technical field, more particularly to a kind of urea pump detecting system.
Background technology
21 century, as automobile is increasingly popularized, its drawback also progressively embodies.Automobile is most important as 21 century
The vehicles, it is increasingly close with contacting for people, not only bring conveniently, equally also bring harm.Vehicle exhaust
Pollution turns into global problem, because the waste gas of motor vehicle emission endangers urban environment, turns to urban environment and deteriorates.Vapour
Tail gas post processing becomes particularly important, and heavy goods vehicles state IV is marked with the proposition and environmental administration of 12 planning energy strategies
Accurate implementation, the demand of urea pump is increasing, but problem is also more and more.
Urea pump is the important component of urea liquid injection metering system, and its major function is in extracted urea case
Urea liquid, and certain pressure is kept, injection unit is then delivered to, meets that injection metering system is wanted to flow and pressure
Ask.Urea pump configuration is as shown in Figure 1.
Every kind of urea pump is combined (in addition to specific pump) by the component of difference in functionality.
Urea pump motor：Operated by brshless DC motor, move back and forth coaxially connected eccentric wheel band dynamic diaphragm,
So as to which urea is enabled its flow into pump chamber in control piper.
Reversing valve (check valve)：Belong to magnetic valve, need to hold for controlling urea to flow to, during vehicle accidental conditions
It is continuous constantly to input urea to nozzle；But when vehicle is shut down, it is controlled to return remaining urea liquid suck-back in pipeline in urea box.
Air valve：Belong to magnetic valve, for controlling the switch valve that whether air enters in air compressor.
Nozzle：Have the function that to spray urea pump solution and compressed air mixed liquor.
Resistive heater：Urea pump bottom plate heating and the heating of filter core room are broadly divided into, equipped with single heated protective electricity
Resistance, resistance is positive temperature coefficient resistor, and temperature more high value is bigger, and protection temperature is 110 DEG C.
Liquid level sensor：Detect liquid level (full liquid level and zero liquid level), send alarm signal to vehicle during zero liquid level.
Temperature sensor：It is generally used for monitoring the temperature of catalyst converter.
Pressure sensor：It is generally used for monitoring the hydraulic pressure in urea pump pump chamber.
Urea pump has polytype, and can be divided into has CAN controller urea pump and without CAN controller urea pump.
Urea pump detecting system is used to detect the good with bad of urea pump all parts, if for example, liquid level and temperature sensor damages
When bad or not connected, when supplying 5V voltages at its both ends, voltage will keep constant；Conversely, if liquid level and temperature sensor is normal, when
5V voltages are supplied at its both ends, voltage will be pulled down to 4V or so (this voltage can change with variation of ambient temperature).
Vehicle-mounted DCU computers control engine operating, when engine speed reaches certain value, urea pump can just start work
Make, urea pump can now be detected, but require that engine reaches certain rotating speed, intake air temperature reaches certain temperature etc.,
Therefore it is not convenient enough.
It is the urea pump experimental bench in the utility model of " CN205654521 " in Authorization Notice No., there is peripheral hardware source of the gas, add
Boiler etc., the detection carried out to urea pump can be realized, but its shortcoming is can not to detect the urea pump using CAN controller,
Can not real-time transform electric machine frequency, with ensure detection high efficiency.
Utility model content
In order to overcome the defects of existing, the utility model proposes a kind of urea pump detecting system.
According to the utility model, there is provided a kind of urea pump detecting system, as shown in Fig. 2 including：Power module, data
Acquisition module, pin control circuit and control module, wherein, power module, external power source is connected, thinks urea pump detecting system
Power supply；Data acquisition module, the signal wire of urea pump building block is connected, to gather the voltage of urea pump building block, electric current
Deng the voltage and current value of motor, reversing valve, nozzle component such as in pump；Pin control circuit, for connecting urea pump group
Into the both positive and negative polarity of part, such as urea pump motor, reversing valve, temperature sensor, pressure sensor, liquid level sensor, adding thermal resistance
Silk etc., voltage is provided for it；Control module, connection pin control circuit, data acquisition module, with controlling switch control circuit
Output voltage, the voltage and/or current detecting urea pump building block sent according to data acquisition module.
Preferably, power module includes hardware protection circuit, for protecting urea pump and urea pump detecting system hardware electricity
Road, after urea pump detecting system is connected and is powered with urea pump, if suddenly when there is high current, hardware protection circuit is from dynamic circuit breaker
Electricity.
Further, data acquisition module includes D/A conversion unit, by the voltage of the urea pump building block of collection and/
Or current signal be converted to data signal after be sent to control module.
Further, detecting system also includes can controllers, the can modules and control module of urea pump is connected, for connecing
Can orders are received and sent, transmit the voltage and/or the control information of current value and control module of urea pump building block, control
The voltage and/or current detecting urea pump building block that module is sent according to can controllers.
Further, threshold value is provided with control module, if the voltage and/or current value of urea pump building block are in threshold
In the range of value, then it represents that urea pump building block is normal.
Further, control system is powered by pin control circuit with conversion system to urea pump motor, and then
The urea pump motor is controlled to operate.
Further, control module also includes pressure calculation unit, frequency computing unit, judging unit；Calculation of pressure list
Member, for calculating hydraulic pressure in urea pump or air pressure at the appointed time and sending result to the judging unit；Frequency meter
Unit is calculated, for calculating the motor power on/off frequency of output；Judging unit, based on receiving the pressure calculation unit output
Result is calculated, if result of calculation is not up to defined threshold, the frequency computing unit meter is exported to the pin control module
The new motor power on/off frequency calculated；If the pressure value of urea pump reaches defined threshold within the reference time, the electricity exported
Machine power on/off frequency will keep constant, i.e., exported by current frequency is stable.
The utility model provides a kind of urea pump detecting system, solves that existing detecting instrument is cumbersome and measurement essence
Low problem is spent, improves the efficiency of urea pump detection and maintenance, while using the mode controlled motor of frequency conversion, detects urea pump
System can be realized more accurately and efficiently to urea pump and urea pump component controls, detection and maintenance integration detection.
Brief description of the drawings
Above and other aspect and feature of the present utility model will be in clearly to the explanation of embodiment from below in conjunction with accompanying drawing
It is existing, wherein：
Fig. 1 is urea pump structural representation；
Fig. 2 is the urea pump detecting system structural representation according to the utility model one embodiment；
Fig. 3 is the structural representation according to the control module of the utility model one embodiment.
Embodiment
A kind of urea pump detecting system provided by the utility model is carried out with specific embodiment below in conjunction with the accompanying drawings detailed
Description.Do herein with explanation simultaneously, in order that embodiment is more detailed, the following examples are optimal, are preferable to carry out
Example, other alternatives can be also used for some known technologies those skilled in the art and are implemented；And accompanying drawing part
Merely to more specifically describing embodiment, and it is not intended as and the utility model is specifically limited.
According to one side of the present utility model, there is provided a kind of urea pump detecting system, as shown in Fig. 2 including：Power supply mould
Block, data acquisition module, pin control circuit and control module, wherein, power module, external power source is connected, thinks urea pump
Detecting system is powered；Data acquisition module, the signal wire of urea pump building block is connected, to gather the electricity of urea pump building block
Pressure, electric current etc., the voltage and current value of motor, reversing valve, nozzle component such as in pump；Pin control circuit, for connecting
The both positive and negative polarity of urea pump part, as urea pump motor, reversing valve, temperature sensor, pressure sensor, liquid level sensor,
Resistive heater etc., voltage is provided for it；Control module, connection pin control circuit, data acquisition module, for controlling switch
The output voltage of control circuit, the voltage and/or current detecting urea pump building block sent according to data acquisition module.
Preferably, power module includes hardware protection circuit, for protecting urea pump and urea pump detecting system hardware electricity
Road, after urea pump detecting system is connected and is powered with urea pump, if suddenly when there is high current, hardware protection circuit is from dynamic circuit breaker
Electricity.
The electric current and magnitude of voltage of data collecting module collected urea pump building block, and control module is sent it to,
The upper lower threshold value of urea pump current/voltage is provided with control module, judges urea pump if electric current, voltage value exceed upper threshold value
Short circuit, if being less than lower threshold value, judge urea pump open circuit, then urea pump is normal condition among upper lower threshold value.Preferably, also
D/A conversion unit can be included, for electric current, magnitude of voltage to be converted into data signal, then sends control module to again.
Urea pump building block can include pressure sensor, urea pump motor, nozzle, reversing valve, air valve etc., data
The curtage change of acquisition module collection each building block of urea pump, is sent to control module, control module passes through wherein
Default each part of threshold decision whether there is problem.It is specific as follows：
(1) pressure sensor detects：Control module by pin control circuit be the positive and negative pin powered of pressure sensor (i.e.
Voltage is provided), control module makes the motor of urea pump by certain frequency rotation come extracted urea solution by pin control module,
Urea liquid is full of the pump chamber of urea pump, so that the voltage output of the pressure sensor (hydraulic pressure or air pressure) of urea pump occurs
Change, the voltage on the signal wire of data collecting module collected pressure sensor, and pass control module back and judged：It is if electric
It is pressed between 0.2V~4.6V, then it represents that its is normal；If the voltage on the signal wire of pressure sensor persistently keep it is constant or
During beyond normal range (NR), represent that pressure sensor has problem, can be alarmed.
(2) urea pump electric machines test：Control module is the positive and negative pin powered of motor by pin control circuit, controlled motor
Operated with a fixed frequency, the current value of data collecting module collected motor simultaneously sends control module to and judged：
If electric current is continuously maintained in more than 3A or increases to significantly larger than 3A suddenly, illustrate that short circuit or motor occur in circuit to be present
Problem, alarmed or stop testing；If electric current very little and persistently keeping constant, illustrate open circuit or motor lines occur in circuit
Be present problem in road, alarmed.
Controlled motor is as follows by the principle of certain frequency operating：Motor needs 3 pin controls, that is, draws high No. 1 pin and (supply
Electricity), No. 3 pins (ground connection) are dragged down, then draw high or drag down No. 2 pins according to certain frequency, so that it may are realized according to certain duty
Operated than controlled motor.If want to adjust motor running speed or frequency, the dutycycle of No. 2 pins need to be only adjusted
(dutycycle refers to high level time ratio shared within a cycle).
(3) nozzle detects：Powered 15 seconds or so (discharge line air) according to fixed frequency for the positive and negative pin of nozzle, control
Module is powered by pin control module to nozzle both positive and negative polarity, while gives nozzle positive pole switching electricity, nozzle according to certain dutycycle
Start open, close according to certain frequency, the current value of data collecting module collected nozzle simultaneously sends control module to and sentenced
It is disconnected：If electric current is continuously maintained in more than 4A or increases to significantly larger than 4A suddenly, illustrate short circuit or nozzle occur in circuit
Problem be present, it is necessary to stop testing or alarm；Nozzle closes moment, if electric current very little and persistently keeping constant, illustrates in circuit
Be present problem in generation open circuit or nozzle circuit, alarmed.
(4) reversely valve test detection：Control module is the positive and negative pin powered of reversing valve by pin control circuit, and data are adopted
Collecting module collection reversing valve signal wire, (reversing valve signal wire is exactly to give reversing valve supply lines, and reversing valve only has 2 lines, is respectively
Supply lines is positive pole, ground wire i.e. negative pole.Wherein, the signal that we are gathered collects from supply lines) on voltage；It is logical
Discontinuous power supply is crossed, control reversing valve is opened according to fixed interval time.
(5) adding thermal resistance filament test：By continued power, control resistive heater is heated, and (testing time is about 30
Second, the testing time is long may to damage resistive heater).By continued power, control module by the electric current that collects or
Voltage change, detection resistive heater whether there is problem.
(6) urea pump motor is controlled using intelligent frequency-conversion method.
The principle of control is as follows：Pin control circuit by detecting system, which is that urea pump motor output one is fixed, leads to
Electric frequency (number of power on/off i.e. per second, such as, every 1 second power on/off 10 times, the frequency of power on/off is exactly 10Hz) so that urine
Plain pump motor is operated with fixed frequency, and the hydraulic pressure of urea pump can be gradually increasing, data with the operating of urea pump motor
Acquisition module gathers the magnitude of voltage of urea pump pressure sensor and sends controller in real time.
As shown in figure 3, control module also includes pressure calculation unit, frequency computing unit and judging unit.
Pressure calculation unit, at the appointed time (such as every operating 10s since motor) calculate urea pump in hydraulic pressure
Or air pressure, formula are as follows：
FPressure=USensor×φ………………………………………………(1)
In above formula, FPressureRepresent the pressure (hydraulic pressure or air pressure) in urea pump, USensorFor pressure sensor voltage value, φ is
Ratio coefficient, span are between 0 to 5.
Frequency computing unit, calculate and export new motor power on/off frequency, to cause motor to accelerate to operate again, and make urine
Plain pump pressure raises again, and computational methods are as follows：
fOutput=(1+10%) fCurrently
Wherein, fOutputRepresent the urea pump motor power on/off frequency of the control module output；fCurrentlyRepresent current urea pump
The current power on/off frequency of motor；
Judging unit, the result of calculation of pressure calculation unit output is received, if result of calculation is not up to defined threshold (example
Such as 400Kpa), then the new motor power on/off frequency calculated to pin control module output frequency computing unit；If referring to
The hydraulic pressure of urea pump or atmospheric pressure value reach defined threshold (such as 400Kpa) in time, and the electric machine frequency of output will keep constant,
Exported by current frequency is stable.
The advantages of this frequency conversion is：In motor operation course, by conversion system urea pressure can be made faster to increase
To threshold values, to improve motor running efficiency；If declining suddenly occurs in pressure, frequency conversion (frequency raising) can make urea pump internal pressure
Trying hard to keep, it is constant to hold；When urea failure of pump, urea pressure rises always, and now by frequency conversion, (frequency reduces, and passes through formula above
Can easily design frequency reduce formula) can make urea pump internal pressure try hard to keep hold it is constant, without due to pressure
It is excessive and the problem of cause urea pump conduit to collapse out.
Detecting system can also include can controllers, to connect the urea pump with can modules, can controllers and control
Module is connected, and for receiving and sending can orders, transmits the voltage and/or current value and control module of urea pump building block
Control information, voltage that control module is sent according to can controllers and/or the building block of current detecting urea pump it is good
It is bad.
After the can controllers of urea pump detecting system receive the order that control module is sent, can lives are sent to urea pump
Make and (meet ISO15765 international standard protocols, different manufacturers have different proprietary protocols), the can modules of urea pump receive this
Urea pump is controlled to carry out establishing pressure, keep pressure, empty the operation such as pipeline, nozzle characteristic testing after order.After the completion of order, urea
Pump feeds back to the can controllers of detecting system, and can controllers send information to control module again.
Certainly, the utility model also has various other embodiments, in the situation without departing substantially from the utility model spirit and essence
Under, those skilled in the art can make various corresponding changes according to the utility model, but this change should all belong to
Scope of the claims appended by the utility model.
Claims (10)
1. a kind of urea pump detecting system, including：Power module, data acquisition module, pin control circuit and control module, its
In：
The power module connection external power source thinks the urea pump detecting system power supply；
The signal wire of the data acquisition module connection urea pump building block, to gather the voltage of the urea pump building block
And/or current value and it is sent to the control module；
The pin control circuit connects the positive pole and negative pole of the urea pump building block, thinks the urea pump building block
Voltage is provided；And
The control module connects the pin control circuit and the data acquisition module, for controlling the pin control electricity
The output voltage on road, and urea pump building block described in the voltage and/or current detecting sent according to the data acquisition module.
2. urea pump detecting system according to claim 1, wherein, the power module includes hardware protection circuit, institute
Hardware protection circuit is stated to automatically power off when there is high current suddenly.
3. urea pump detecting system according to claim 1, wherein, the data acquisition module includes digital-to-analogue conversion list
Member, the control is sent to after the voltage of the urea pump building block of collection and/or current signal are converted into data signal
Molding block.
4. urea pump detecting system according to claim 1, wherein, the detecting system also includes can controllers, described
Can controllers connect the control module and the can modules of the urea pump, to transmit the voltage of the urea pump building block
And/or the control information that current value and the control module are sent, the electricity that the control module is sent according to the can controllers
Urea pump building block described in pressure and/or current detecting.
5. urea pump detecting system according to claim 1, wherein, threshold value is provided with the control module, if institute
State urea pump building block voltage and/or current value in the threshold range, then it represents that the urea pump building block is just
Often.
6. urea pump detecting system according to claim 5, wherein, the urea pump building block is pressure sensor,
The threshold value of the pressure sensor is 0.2V-4.6V.
7. urea pump detecting system according to claim 5, wherein, the urea pump building block is urea pump motor,
The threshold value of the urea pump motor is 3A.
8. urea pump detecting system according to claim 5, wherein, the urea pump building block is urea Unit injector,
The threshold value of the urea Unit injector is 4A.
9. urea pump detecting system according to claim 1, wherein, the urea pump building block is urea pump motor,
The control system is powered by the pin control circuit with conversion system to the urea pump motor, and then controls institute
State the operating of urea pump motor.
10. urea pump detecting system according to claim 9, wherein：
The control module also includes pressure calculation unit, frequency computing unit and judging unit；
The pressure calculation unit is for the hydraulic pressure in calculating urea pump or air pressure at the appointed time and sends result to institute
State judging unit；
The frequency computing unit is used for the motor power on/off frequency for calculating output；And
The judging unit is used for the result of calculation for receiving the pressure calculation unit output, if the result of calculation is not up to
Defined threshold, then the new motor power on/off frequency of the frequency computing unit calculating is exported to the pin control module；Such as
The fruit hydraulic pressure of urea pump or atmospheric pressure value within the reference time reach defined threshold, then the electric machine frequency exported keeps constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720731521.3U CN206903851U (en) | 2017-06-22 | 2017-06-22 | A kind of urea pump detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720731521.3U CN206903851U (en) | 2017-06-22 | 2017-06-22 | A kind of urea pump detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118115A (en) * | 2019-05-28 | 2019-08-13 | 苏州卡布斯精工科技有限公司 | A kind of urea pump detection prosthetic device and detection restorative procedure |
| 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 |
| US20230003211A1 (en) * | 2021-06-30 | 2023-01-05 | Memolub International | Device for delivering a fluid to a consumption point and associated method |
-
2017
- 2017-06-22 CN CN201720731521.3U patent/CN206903851U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118115A (en) * | 2019-05-28 | 2019-08-13 | 苏州卡布斯精工科技有限公司 | A kind of urea pump detection prosthetic device and detection restorative procedure |
| CN110118115B (en) * | 2019-05-28 | 2024-04-05 | 苏州卡布斯精工科技有限公司 | Detection and repair device and detection and repair method for urea pump |
| 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 |
| US20230003211A1 (en) * | 2021-06-30 | 2023-01-05 | Memolub International | Device for delivering a fluid to a consumption point and associated method |
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