CN103913308A - Method for detecting response time of position feedback type EGR valve - Google Patents
Method for detecting response time of position feedback type EGR valve Download PDFInfo
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- CN103913308A CN103913308A CN201410171585.3A CN201410171585A CN103913308A CN 103913308 A CN103913308 A CN 103913308A CN 201410171585 A CN201410171585 A CN 201410171585A CN 103913308 A CN103913308 A CN 103913308A
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Abstract
The invention discloses a method for detecting response time of a position feedback type EGR valve. The detecting method comprises the first step of inputting an adjustable duty ratio voltage to the EGR valve to be detected, the second step of collecting electromotive force of a lift sensor of the EGR valve to be detected and displaying the electromotive force through a display screen, the third step of determining the response time of the EGR valve according to a voltage signal changing curve displayed on the display screen. According to the detecting method, opening and closing response time of the EGR valve is detected according to the characteristics of the sensor of the position sensor type EGR valve, the performance detecting means on the electric EGR valve are enriched, working efficiency of experimenters and detecting precision are improved, the method is common and easy to learn, and operation is easy.
Description
Technical field
The present invention relates to the detection method of a kind of EGR response valve time in engine exhaust emission control device technical field, particularly engine exhaust emission recirculating system.
Background technology
EGR valve in engine exhaust-gas recirculating system (egr system) is mainly used in regulating the flow of controlling EGR gas, electric EGR valve is by the aperture size of inner DC MOTOR CONTROL air intake opening, thereby pneumatic EGR valve is the aperture size of controlling the vacuum tightness control EGR valve that imposes on EGR valve by vacuum governor.Two kinds of EGR valves all regulate exhaust gas flow in mode separately, and returning to cylinder after waste gas is mixed by a certain percentage with fresh air carries out recycle, to reduce combustor inner cylinder temperature and burning rate, thereby further reduce the discharge capacity of NOX.
In situation along with current emission regulation demands increasingly stringent, EGR valve is as the critical component of exhaust emissions, and it is also more and more stricter to the requirement of precision, and therefore EGR valve needs through strict detection to guarantee to meet user demand before dispatching from the factory.Tradition is in the process that electric EGR valve is detected, to adopt the stabilized voltage supply that directly connects 12V or 24V at the input end of motor of electric EGR valve, then the feedback voltage of EGR valve is outputed on oscillograph, read the response time of EGR valve by oscillograph; Not only cannot realize the accurate EGR response valve time that obtains, and cannot detect from the response time of any opening degree between 0% ~ 100% EGR valve.For the object that is able to the EGR response valve time of any opening degree to detect, people have expected adopting regulated power supply to carry the mode of variable voltage to EGR valve, but still cannot meet people and can fast, accurately detect the object of EGR response valve time.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of simple to operate, be convenient to method that the EGR response valve time is detected, further accuracy of detection and work efficiency.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
With the position feedback type EGR detection method of response valve time, comprise the following steps:
A. input adjustable dutycycle voltage to EGR valve to be detected;
B. gather the electromotive force of EGR lift of a valve sensor to be detected, and show by display screen;
C. determine the response time of EGR valve according to the voltage signal change curve that shows screen display.
The preparation method of the adjustable dutycycle voltage described in step a of the present invention is: connect computer board at the input end that detects EGR valve, computer board is powered by regulated power supply, and the input end of computer board connects duty cycle adjustment knob; In the time that detected EGR valve is electric EGR valve, the output terminal of computer board is directly connected with two input ends of electric EGR valve motor; In the time that detected EGR valve is pneumatic EGR valve, the output terminal of computer board connects the vacuum input port of pneumatic EGR valve through vacuum governor, and the input end of vacuum governor connects vacuum pump.
Described in step b of the present invention, the electromotive force collection of EGR lift of a valve sensor completes collection by the output terminal connection voltage signal acquisition card at EGR lift of a valve sensor.
Described in step c of the present invention, determine that according to voltage signal change curve the concrete grammar of EGR response valve time is: in the time that display screen shows the voltage signal variable condition of EGR lift of a valve sensor, adopt coordinate diagram form to show, the coordinate diagram time draws as ordinate as horizontal ordinate, voltage signal, can intuitively read the response time of EGR valve at any opening degree.
Owing to having adopted above technical scheme, the invention technological progress is as follows.
The present invention has used the open and close response time of detecting EGR valve with the sensor characteristic of position transducer formula EGR valve, in testing process, oscillograph has been changed into voltage signal acquisition card and display screen and has replaced, and not only shows more intuitively, and with low cost; Can test EGR valve under each different duty voltage the switching response time, simultaneously can also on screen, find out intuitively the curve of EGR valve events, thereby judge whether clamping stagnation of EGR valve.The performance test means for electric EGR valve have been enriched in application of the present invention, experimenter's work efficiency and accuracy of detection are improved, popular easy to learn, simple to operate, only need to regulate required dutycycle voltage by knob, thereby again by display screen read EGR valve open curve obtain out the length of response time, thereby draw motion conditions and the response time of EGR valve.
Brief description of the drawings
Accompanying drawing 1 is principle of work schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
With the position feedback type EGR detection method of response valve time, comprise the following steps:
A. input adjustable dutycycle voltage to EGR valve to be detected.In this step, the preparation method of adjustable dutycycle voltage is: connect computer board at the input end that detects EGR valve, computer board is powered by regulated power supply, and the input end of computer board connects duty cycle adjustment knob; In the time that detected EGR valve is electric EGR valve, the output terminal of computer board is directly connected with two input ends of electric EGR valve motor; In the time that detected EGR valve is pneumatic EGR valve, the output terminal of computer board connects the vacuum input port of pneumatic EGR valve through vacuum governor, and the input end of vacuum governor connects vacuum pump.
B. gather the electromotive force of EGR lift of a valve sensor to be detected, and show by display screen.The electromotive force collection of the lift of a valve of EGR described in this step sensor connects voltage signal acquisition card by the output terminal at EGR lift of a valve sensor and completes collection.
C. determine the response time of EGR valve according to the voltage signal change curve that shows screen display.In this step, determine that according to voltage signal change curve the concrete grammar of EGR response valve time is: in the time that display screen shows the voltage signal variable condition of EGR lift of a valve sensor, adopt coordinate diagram form to show, the coordinate diagram time draws as ordinate as horizontal ordinate, voltage signal, can intuitively read the response time of EGR valve at any opening degree.
In the present invention with being equiped with the lift range sensor for detecting EGR valve opening in position feedback type EGR valve, lift range sensor is mainly made up of a Hall element and magnetic cylinder, in the time of EGR valve events, Hall element slides along magnetic cylinder accordingly, the linear variation of electromotive force that produces in the process of sliding, can obtain response time of EGR valve by gathering the variation of lift range sensor voltage signal.
As shown in Figure 1, concrete testing process is as follows for principle of work of the present invention:
Regulated power supply is supplied with 12V or 24V voltage to computer board, gives the lift range sensor supply 5V voltage of EGR valve.Duty cycle adjustment knob can be adjusted according to the demand of testing crew the output of computer board dutycycle voltage, dutycycle Voltage-output is to the vacuum governor of the motor side of electric EGR valve or the pneumatic EGR valve of output, in the time that EGR valve opens or cuts out, voltage signal acquisition card gathers the change in voltage between EGR lift of a valve sensor signal end and ground wire, by display screen, the situation of change of voltage signal is shown again, using the time as horizontal ordinate, voltage is as ordinate, just can read intuitively the response time of valve open and close.
The one band position feedback type EGR response valve time detection device proposing for realizing detection method of the present invention, comprise cabinet, the top end face of cabinet is provided with workbench, is provided with the support of placing electric controling part and the cavity of placing vacuum pump in cabinet.
Described workbench comprises the operating platform of level and the display platform of setting, and display platform adopts and is obliquely installed, and angle between operating platform can arrange 45 ° ~ 60 °, to facilitate experimenter to observe and to operate.
On display platform, be provided with display screen, for showing the current dutycycle voltage of detected EGR valve and the response time curve that detected EGR valve feeds back to exported to, the big or small curve calculation switching response time that facilitates experimenter to open according to detected EGR valve.
On the operating platform of level, be provided with power adjustment switch, dutycycle and export big or small gauge tap, electric EGR valve test start button, pneumatic EGR valve test start button, vacuum tightness size control handle and electric EGR valve interface and pneumatic EGR valve interface.Facilitate experimenter to select corresponding button to operate according to detected EGR valve.
On support in cabinet, be provided with regulated power supply, computer board, voltage signal acquisition card and vacuum governor, in the inner chamber of cabinet, vacuum pump be installed.
In this pick-up unit, the output terminal of regulated power supply is connected with the power input of computer board and voltage signal acquisition card respectively through power adjustment switch, is used to computer board and voltage signal acquisition card that working power is provided; The signal output part of computer board 4 and voltage signal acquisition card is respectively by data line and display screen, computer board shows the current dutycycle voltage transmission of exporting to detected EGR valve to display screen, the response time curve transmission that voltage signal acquisition card feeds back to the detected EGR valve gathering shows to display screen.The input end of computer board is also exported big or small gauge tap with dutycycle and is connected, for receiving the required duty cycle control signal of experiment.
The control signal output terminal of computer board is provided with two-way, is respectively used to control electric EGR valve and pneumatic EGR valve.Wherein a road output terminal is connected with electric EGR valve interface through electric EGR valve test start button, electric EGR valve interface is for connecting the input end of motor of electric EGR valve, and the position transducer of electric EGR valve connects the signal input part of voltage signal acquisition card by data line.Another road is connected with the input end of vacuum governor through pneumatic EGR valve test start button, the output terminal of vacuum governor connects pneumatic EGR valve interface, pneumatic EGR valve interface is for connecting the input end of motor of pneumatic EGR valve, and the position transducer of pneumatic EGR valve connects the signal input part of voltage signal acquisition card by data line; Vacuum governor input end also connects vacuum pump through vacuum tightness size control handle.
When this pick-up unit is used for testing electric EGR valve, the motor of electric EGR valve to be detected is connected on electric EGR valve interface, press electric EGR valve test start button, export big or small gauge tap to computer board input duty cycle voltage control signal by dutycycle, computer board according to dutycycle voltage control signal to electric EGR valve output duty cycle voltage to be detected; Electric EGR valve to be detected is opened after receiving signal; Voltage signal acquisition card can Real-time Collection electric EGR valve to be detected unlatching curve, and show by display screen.
When this pick-up unit is used for testing pneumatic EGR valve, the motor of pneumatic EGR valve to be detected is connected on pneumatic EGR valve interface, press pneumatic EGR valve test start button, export big or small gauge tap to computer board input duty cycle voltage control signal by dutycycle, computer board according to dutycycle voltage control signal to vacuum governor output duty cycle voltage; Open vacuum tightness size control handle, vacuum pump provides vacuum to vacuum governor, and vacuum governor flows to the vacuum of pneumatic EGR valve to be detected according to dutycycle Control of Voltage, thereby controls the aperture of pneumatic EGR valve.Voltage signal acquisition card can Real-time Collection pneumatic EGR valve to be detected unlatching curve, and show by display screen.
In the present invention, display screen can demonstrate the sensor voltage curve of current dutycycle voltage swing, vacuum tightness size and EGR valve simultaneously, by measuring the width of curvilinear motion, thereby draws the response time of EGR valve from any opening degree between 0%-100%.
Claims (4)
1. with the position feedback type EGR detection method of response valve time, it is characterized in that comprising the following steps:
A. input adjustable dutycycle voltage to EGR valve to be detected;
B. gather the electromotive force of EGR lift of a valve sensor to be detected, and show by display screen;
C. determine the response time of EGR valve according to the voltage signal change curve that shows screen display.
2. according to claim 1 with the position feedback type EGR detection method of response valve time, the preparation method that it is characterized in that the adjustable dutycycle voltage described in step a is: connect computer board at the input end that detects EGR valve, computer board is powered by regulated power supply, and the input end of computer board connects duty cycle adjustment knob; In the time that detected EGR valve is electric EGR valve, the output terminal of computer board is directly connected with two input ends of electric EGR valve motor; In the time that detected EGR valve is pneumatic EGR valve, the output terminal of computer board connects the vacuum input port of pneumatic EGR valve through vacuum governor, and the input end of vacuum governor connects vacuum pump.
3. according to claim 2 with the position feedback type EGR detection method of response valve time, the electromotive force collection that it is characterized in that EGR lift of a valve sensor described in step b connects voltage signal acquisition card by the output terminal at EGR lift of a valve sensor and completes collection.
4. according to claim 3 with the position feedback type EGR detection method of response valve time, it is characterized in that determining that according to voltage signal change curve the concrete grammar of EGR response valve time is described in step c: in the time that display screen shows the voltage signal variable condition of EGR lift of a valve sensor, adopt coordinate diagram form to show, the coordinate diagram time draws as ordinate as horizontal ordinate, voltage signal, can intuitively read the response time of EGR valve at any opening degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410171585.3A CN103913308A (en) | 2014-04-25 | 2014-04-25 | Method for detecting response time of position feedback type EGR valve |
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| CN201410171585.3A CN103913308A (en) | 2014-04-25 | 2014-04-25 | Method for detecting response time of position feedback type EGR valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775919A (en) * | 2015-04-25 | 2015-07-15 | 无锡隆盛科技股份有限公司 | Simple closed-loop control device for EGR (Exhaust Gas Recirculation) valve |
| CN104792352A (en) * | 2015-04-25 | 2015-07-22 | 无锡隆盛科技股份有限公司 | Accelerator position sensor initial position calibration device |
| CN104990676A (en) * | 2015-07-03 | 2015-10-21 | 西安航天动力试验技术研究所 | Test bed valve sealing and operation characteristic detection system and detection method |
| CN105388006A (en) * | 2015-11-13 | 2016-03-09 | 无锡隆盛科技股份有限公司 | Response time detection method for position feedback-free EGR valve |
| CN110926780A (en) * | 2019-12-02 | 2020-03-27 | 苏州斯开尔测试设备有限公司 | Electric valve comprehensive test system |
| CN113049023A (en) * | 2019-12-26 | 2021-06-29 | 国核电站运行服务技术有限公司 | Online real-time monitoring device and method for electric valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775919A (en) * | 2015-04-25 | 2015-07-15 | 无锡隆盛科技股份有限公司 | Simple closed-loop control device for EGR (Exhaust Gas Recirculation) valve |
| CN104792352A (en) * | 2015-04-25 | 2015-07-22 | 无锡隆盛科技股份有限公司 | Accelerator position sensor initial position calibration device |
| CN104990676A (en) * | 2015-07-03 | 2015-10-21 | 西安航天动力试验技术研究所 | Test bed valve sealing and operation characteristic detection system and detection method |
| CN105388006A (en) * | 2015-11-13 | 2016-03-09 | 无锡隆盛科技股份有限公司 | Response time detection method for position feedback-free EGR valve |
| CN110926780A (en) * | 2019-12-02 | 2020-03-27 | 苏州斯开尔测试设备有限公司 | Electric valve comprehensive test system |
| CN113049023A (en) * | 2019-12-26 | 2021-06-29 | 国核电站运行服务技术有限公司 | Online real-time monitoring device and method for electric valve |
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Application publication date: 20140709 |
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