CN113090521B - Dry-state non-gas-assisted urea pump testing system and method - Google Patents
Dry-state non-gas-assisted urea pump testing system and method Download PDFInfo
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- CN113090521B CN113090521B CN201911340185.XA CN201911340185A CN113090521B CN 113090521 B CN113090521 B CN 113090521B CN 201911340185 A CN201911340185 A CN 201911340185A CN 113090521 B CN113090521 B CN 113090521B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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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 invention provides a dry non-gas-assisted urea pump test system and a method, which belong to the technical field of diesel vehicle aftertreatment, and mainly utilize an upper computer to monitor the resistance or pressure of a pressure sensor P2 in a dry urea pump through a communication converter by a control circuit board, control the urea pump to respectively carry out output/back pumping pressure monitoring by a pressure sensor P1, and transmit the monitored data to the upper computer for storage and judgment and analysis of the working performance of the urea pump.
Description
Technical Field
The invention belongs to the technical field of diesel vehicle aftertreatment, and relates to a system and a method for testing a dry non-gas-assisted urea pump of a diesel vehicle aftertreatment device.
Background
The diesel vehicle aftertreatment urea pump generally comprises a urea tank for storing urea aqueous solution, a urea pump for delivering/withdrawing urea aqueous solution, a urea aqueous solution nozzle, and a urea aqueous solution pipeline and an electric control unit for connecting the urea aqueous solution nozzle and the urea aqueous solution nozzle. The diesel vehicle aftertreatment urea pump must meet a plurality of performance requirements such as fluid infusion, injection, unfreezing, back-pumping and injection precision. To meet these requirements, the various components and parameters of the urea pump must be tested step by step. In the process of testing the urea pump of the existing post-treatment device, the dry-state urea pump which is newly installed cannot be independently and comprehensively tested, and the performance of the urea pump and the electrical control part of the urea pump are not systematically tested. The method is characterized in that all parts are only tested before assembly, or a newly developed diesel vehicle aftertreatment urea pump is installed on a diesel vehicle engine pedestal or the whole vehicle for repeated test verification, the detection mode is complex and difficult to operate, the working performance of the urea pump cannot be directly and effectively reflected, the development progress of the new urea pump is prolonged, the verification difficulty is increased, and the detected data has no targeted reference value.
Disclosure of Invention
Aiming at the problems, in the aspect of testing the development of a new urea pump, the fault detection of a non-air-assisted urea pump electric control component and the performance test of the positive and negative pressure performances of infusion and pumping back are particularly necessary in a dry state, so that a performance test system of the non-air-assisted urea pump in the dry state is specially developed, and the system mainly comprises an upper computer, a communication converter, a rack power supply module, a control circuit board, an external temperature sensor T0, a urea pump with an infusion port, a liquid return port and an injection port, a pressure sensor P1 and a liquid inlet connecting pipe with a sealed single side; a pressure sensor P2, an internal temperature sensor T2, a heating sheet for unfreezing and insulating a urea aqueous solution pipeline in the urea pump and a heating sheet temperature sensor T1 are also arranged in the urea pump;
the single-side closed liquid inlet connecting pipe is connected to a liquid inlet of the urea pump through a pressure sensor P1;
the communication converter is electrically connected with the upper computer and the control circuit board respectively; the control circuit board is respectively and electrically connected with the urea pump, the external temperature sensor T0 and the pressure sensor P1; the rack power supply module converts 220V alternating current into direct current to supply to the control circuit board.
The upper computer monitors the temperature of a heating plate temperature sensor T1 and an inner temperature sensor T2 in the urea pump, the resistance value of a heating plate and the resistance value or the pressure of a pressure sensor P2 through a communication converter and a control circuit board, controls the urea pump to carry out output/back pumping pressure monitoring respectively through the pressure sensor P1, and transmits the monitored data to the upper computer for storage and judgment and analysis.
The upper computer comprises: the system comprises a host, a display, test system software and a keyboard, and is used for storing and running a test system program; transmitting the test instruction to a control circuit board through a communication converter, and simultaneously: 1) Receiving the monitoring temperature or resistance/pressure data of the urea pump converted by the communication converter by the control circuit board, comparing the monitoring temperature or resistance/pressure data with corresponding calibration parameters, judging and storing the monitoring data, if the comparison is unqualified, automatically turning on a red light, displaying a fault area, and if the comparison is qualified, automatically turning on a green light; and 2) receiving the monitoring pressure data converted by the communication converter in the process of controlling the urea pump to transfuse/withdraw by the control circuit board and transmitting the monitoring pressure data to the upper computer to respectively form corresponding curves, judging whether the curves are a pressure rising/falling curve graph along with time, judging whether the monitoring maximum positive pressure value/minimum negative pressure value reaches the corresponding calibration maximum positive pressure value/minimum negative pressure value, if not, automatically turning on a red light to display corresponding fault information, and if so, automatically turning on a green light;
the communication converter: the device is used for converting the test instruction in the upper computer into current or voltage and transmitting the current or voltage to the control circuit board for control or monitoring; meanwhile, the monitoring data of the control circuit board is transmitted and stored in an upper computer after being converted;
the rack power module: the control circuit board is used for converting 220V alternating current into direct current to supply to the control circuit board;
the control circuit board: the urea pump is used for receiving the electric signal which is transmitted by the upper computer and is converted by the test command through the communication converter, monitoring or controlling and monitoring the performance of the urea pump, and simultaneously converting the monitored data into corresponding data signals through the communication converter and transmitting the data signals and storing the data signals in the upper computer;
the pressure sensor P1: the device is used for monitoring the pressure of the urea pump during negative pressure detection and positive pressure detection, and the pressure is transmitted through the communication converter through the control circuit board and stored in the upper computer;
the outer temperature sensor T0: the urea pump temperature monitoring device is used for monitoring the environmental temperature outside the urea pump, and monitoring temperature data are transmitted and stored in an upper computer through the control circuit board and the communication converter.
The above-mentioned monitoring, or controlling and monitoring, the performance of the urea pump at least includes the following items:
1) Monitoring temperature signals of a heating sheet temperature sensor T1 and an inner temperature sensor T2 in the urea pump;
2) Monitoring the resistance value of a heating plate in the urea pump;
3) Monitoring the pressure of a pressure sensor P2 in the urea pump;
4) Controlling a urea pump to perform negative pressure detection through a pressure sensor P1;
5) And monitoring the urea pump pressure sensor P1 for positive pressure detection.
The urea pump also comprises a transfusion motor pump, a pumping electromagnetic pump, a filter and a one-way liquid return valve; the urea pump liquid conveying port, the liquid conveying motor pump, the filter and the urea pump jet are sequentially connected through a urea aqueous solution pipeline to form a urea pump liquid conveying loop, the pumping-back electromagnetic pump is connected in parallel at two ends of the liquid conveying motor pump through the urea aqueous solution pipeline, and a urea aqueous solution pipeline which sequentially connects the pressure sensor and the one-way liquid return valve to the urea pump liquid conveying port is connected between the filter and the urea pump jet.
The test system further comprises an emergency stop switch which is electrically connected with the rack power supply module and the control circuit board and is arranged between the rack power supply module and the control circuit board.
The invention also provides a test method based on the test system, which at least comprises the following test items:
the method comprises the following steps of monitoring faults of a heating plate temperature sensor and an inner temperature sensor in the urea pump, monitoring faults of the heating plate in the urea pump, monitoring faults of a pressure sensor in the urea pump, monitoring negative pressure performance during urea pump infusion and monitoring positive pressure performance during urea pump pumping.
The urea pump internal heating plate temperature sensor and the internal temperature sensor are used for monitoring: the upper computer sends a test instruction to the control circuit board through the communication converter, the control circuit board firstly monitors the ambient temperature of the temperature sensor outside the urea pump and stores and displays the ambient temperature in the upper computer as a calibration parameter Tb; then respectively monitoring the temperature of a heating plate temperature sensor and an inner temperature sensor in the urea pump, transmitting the temperature to an upper computer through a communication converter, comparing and judging the two temperature monitoring data with the calibration parameter temperature Tb by the upper computer, and if one of the two temperature monitoring data exceeds the calibration temperature range, automatically turning on a red light to alarm and displaying a fault area by the upper computer; if the temperature of the upper computer is not beyond the range of the calibration temperature, the upper computer automatically turns on the green light;
monitoring faults of heating plates in the urea pump: the upper computer sends a test instruction to the control circuit board through the communication converter, the control circuit board monitors the resistance value of the heating plate in the urea pump, the resistance value is fed back to the upper computer through the communication converter and is compared and judged with the calibrated resistance value range in the upper computer, and if the resistance value exceeds the calibrated resistance value range, the upper computer automatically lights a red light to give an alarm and displays a fault area; if the resistance value does not exceed the range of the calibrated resistance value, the upper computer automatically turns green;
monitoring the fault of the pressure sensor in the urea pump:
1) The upper computer sends a test instruction to the control circuit board through the communication converter, the control circuit board monitors the pressure of the pressure sensor P2 in the urea pump under the state of not driving the urea pump, the pressure is fed back to the upper computer through the communication converter and is compared and judged with the calibrated pressure range in the upper computer, and if the pressure exceeds the calibrated pressure range, the upper computer automatically lights a red light to give an alarm and displays a fault area; if the pressure does not exceed the calibrated pressure range, the upper computer automatically turns on the green light;
or 2) the upper computer sends a test instruction to the control circuit board through the communication converter, the control circuit board monitors the resistance value of the pressure sensor P2 in the urea pump, the resistance value is fed back to the upper computer through the communication converter and is compared and judged with the calibration resistance value range in the upper computer, and if the resistance value exceeds the calibration resistance value range, the upper computer automatically lights a red light to alarm and displays a fault area; if the resistance value does not exceed the range of the calibrated resistance value, the upper computer automatically turns green;
and monitoring the negative pressure performance of the urea pump during infusion:
the upper computer sends a test instruction to the control circuit board through the communication converter, and the control circuit board drives the urea pump to perform negative pressure test; a negative pressure area is formed in the liquid inlet connecting pipe with the single side sealed, a pressure sensor P1 monitors the negative pressure value of the liquid inlet connecting pipe with the single side sealed within 20 seconds, the negative pressure value is transmitted to an upper computer through a communication converter by a control circuit board to form a negative pressure change curve graph along with time, the maximum negative pressure value is judged to be smaller than a calibration negative pressure value, and if the maximum negative pressure value is not qualified, the upper computer automatically lights a red light to alarm and display a fault area; otherwise, turning on a green light when the color is qualified;
monitoring the positive pressure performance of the urea pump during pumping back: the upper computer sends a test instruction to the control circuit board through the communication converter, and the control circuit board drives the urea pump to perform positive pressure test; a positive pressure area is formed in a single-side closed liquid inlet connecting pipe connected with a liquid inlet of a urea pump, a pressure sensor P1 monitors a positive pressure value in 20 seconds in the single-side closed liquid inlet connecting pipe, a control circuit board transmits the positive pressure value to an upper computer through a communication converter to form a positive pressure change curve graph along with time, the upper computer automatically lights a red light for alarming when the minimum positive pressure value is judged to be larger than a calibrated positive pressure value, and a fault area is displayed; otherwise, the lamp is turned on when the lamp is qualified.
The calibration temperature range is +/-3 ℃, the calibration resistance value range is +/-0.5 omega, the calibration pressure range is 950mbar-1050mbar, the calibration negative pressure value is-150 mbar, and the calibration positive pressure value is 100mbar.
The urea pump also comprises a liquid conveying motor pump, a pumping electromagnetic pump, a filter and a one-way liquid return valve; the urea pump liquid conveying port, the liquid conveying motor pump, the filter and the urea pump jet are sequentially connected through a urea aqueous solution pipeline to form a urea pump liquid conveying loop, the pumping-back electromagnetic pump is connected in parallel at two ends of the liquid conveying motor pump through the urea aqueous solution pipeline, and a urea aqueous solution pipeline which sequentially connects the pressure sensor and the one-way liquid return valve to the urea pump liquid conveying port is connected between the filter and the urea pump jet.
In the test method, the test system further comprises an emergency stop switch which is electrically connected with the rack power supply module and the control circuit board and is arranged between the rack power supply module and the control circuit board.
The dry-state non-gas-assisted urea pump testing system provided by the invention is simple, economical and practical, can complete positive and negative pressure verification and parameter calibration of the non-gas-assisted urea pump in a dry state, can greatly improve the convenience of the early-stage test of the urea pump of the diesel vehicle post-processing device, and greatly shortens the development cycle of the urea pump and parts thereof in the diesel vehicle post-processing device.
Drawings
FIG. 1 is a diagram of a system for testing the performance of a non-air assisted urea pump in a dry state.
FIG. 2 is a pipeline connection diagram of the infusion motor pump in FIG. 1 for negative pressure test;
FIG. 3 is a graph of the negative pressure test of the infusion motor pump of FIG. 2 over time;
FIG. 4 is a diagram of the piping connections for the positive pressure test of the pumpback electromagnetic pump of FIG. 1;
FIG. 5 is a graph of positive pressure over time for the positive pressure test of the pumpback electromagnetic pump of FIG. 4;
Detailed Description
The following describes the system and method for testing the performance of a non-air-assisted urea pump in a dry state according to the present invention with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the test system mainly comprises an upper computer 1, a communication converter 2, a rack power module (19V-32V range) 3, an emergency stop switch 4 (optional), a control circuit board 5, an external temperature sensor T0, and a urea pump 7 with an infusion port, a return port and an injection port (namely, the urea pump 7 comprises a mechanical component and an electric control component, and mainly comprises an infusion motor pump 71, a return electromagnetic pump 72, a filter 77 and a one-way return valve 78), wherein the urea pump electric control component mainly comprises an infusion motor pump 71 motor, a return electromagnetic pump 72 electromagnet, a heating sheet temperature sensor T1 73, an in-pump environment temperature sensor T2 74, a heating sheet 75 and a pressure sensor P276, wherein the infusion port, the infusion motor pump 71, the filter 77 and the injection port of the urea pump 7 are connected in sequence through a urea aqueous solution pipeline to form an infusion loop of the urea pump 7, the return electromagnetic pump 71, the infusion port of the urea pump 71, the filter 77 and the injection port of the urea pump 7 are connected in parallel through a urea aqueous solution pipeline to form an infusion loop, and the return electromagnetic pump 7 is connected in parallel through an aqueous solution pipeline 76 and a urea solution connection pipe between the filter 77 and the urea pump 7 to form an upper pipeline, and the one-way connection pipe of the return liquid injection port of the urea pump 7 is connected in sequence, and the urea pump 7, and the urea solution connection pipe to form a single-way connection pipe of the urea solution connection pipe 9, and the one-way connection pipe of the urea pump 7, and the one-way connection pipe of the one-way connection pipe 9, and the urea pump 7, and the one-way connection pipe of the urea solution connection pipe of the one-way connection pipe of the urea pump 7, and the urea solution connection pipe of the one-way connection pipe of the urea solution connection pipe 9. (solid arrows in the figure indicate air flow lines).
Wherein, the communication converter 2 is respectively connected with the upper computer 1 and the control circuit board 5 through the communication interface for signal transmission. The bench power module 3 converts 220V alternating current into direct current, and the direct current is supplied to the control circuit board 5 through a cable, the output voltage range is 19V-32V, and the maximum output current is 20A. And a sudden stop switch 4 is arranged between the rack power module 3 and the control circuit board 5 and used for testing the system to be powered off in an emergency. The control circuit board 5 is connected to the urea pump 7 through a wire harness to perform control driving. The upper computer 1 sends an electric signal test instruction converted by the communication converter 2 to the control circuit board 5, collects the temperature of the temperature sensor and the pressure/resistance value of the pressure sensor, simultaneously drives the infusion motor pump 71 and the pumpback electromagnetic pump 72 to carry out positive/negative pressure test respectively, and saves the tested and collected data in the upper computer 1. The single-side sealed liquid inlet connecting pipe 9 is connected with a pressure sensor P1 8 through a pipeline and is assembled on a liquid inlet of the dry urea pump.
An upper computer 1: the system comprises a host, a display, test system software and a keyboard, and is used for storing and running a test system program; the test instruction is transmitted to the control circuit board 5 through the communication converter 2, and simultaneously: 1) Receiving the monitoring temperature or resistance/pressure data of the urea pump converted by the communication converter 2 by the control circuit board 5, comparing the monitoring data with corresponding calibration parameters, judging and storing the monitoring data, if the comparison is unqualified, automatically turning on a red light, displaying a fault area, and if the comparison is qualified, automatically turning on a green light; and 2) receiving the monitoring pressure data converted by the communication converter 2 in the process of controlling the urea pump 7 to infuse/withdraw by the control circuit board 5, transmitting the monitoring pressure data to the upper computer 1 to respectively form corresponding curves, judging whether the curves are pressure rising/falling curve graphs along with time, judging whether the monitoring maximum positive pressure value/minimum negative pressure value reaches the corresponding calibration maximum positive pressure value/minimum negative pressure value, if not, automatically turning on a red light to display corresponding fault information, and if so, automatically turning on a green light.
The communication converter 2: the testing device is used for converting a testing instruction in the upper computer 1 into current or voltage and transmitting the current or voltage to the control circuit board 5 for control or monitoring; meanwhile, the monitoring data of the control circuit board 5 is transmitted to the upper computer 1 for analysis and judgment after being converted. Such as: CAN, I 2 C. Link, etc.
Rack power module 3: the 220V alternating current is converted into 28.5V direct current to be supplied to the control circuit board 5, the output voltage range is 19V-32V, and the maximum output current is 20A.
The emergency stop switch 4: the method is used for emergently cutting off the main power supply of the test system when a problem occurs in the test process.
The control circuit board 5: the device is used for receiving an electric signal converted by the communication converter 2 from a test command sent by the upper computer 1 and controlling and/or monitoring the urea pump at least as follows:
1) Monitoring temperature signals of a heating sheet temperature sensor T1 and an inner temperature sensor T2 in the urea pump 7;
2) Monitoring the resistance value of a heating sheet 75 in the urea pump 7;
3) Monitoring the pressure of a pressure sensor P276 in the urea pump 7;
4) Controlling the urea pump 7 to perform negative pressure detection through a pressure sensor P1 8;
5) Monitoring a pressure sensor P1 8 of a urea pump 7 to perform positive pressure detection;
meanwhile, the monitored data is converted into corresponding data signals through the communication converter 2 and transmitted to the upper computer 1;
pressure sensor P1: the device is used for monitoring the pressure of the urea pump 7 during negative pressure detection and positive pressure detection, and the pressure is respectively transmitted to the upper computer 1 through the control circuit board 5 and the communication converter 2;
temperature sensor T0: and detecting the ambient temperature outside the urea pump, transmitting the temperature through the control circuit board 5 through the communication converter 2, and storing the temperature in the upper computer 1.
The specific test method is as follows:
system installation: according to the test system shown in fig. 1, an upper computer 1, a communication converter 2, a rack power module 3, an emergency stop switch 4, a control circuit board 5, an external temperature sensor T0, a test product (namely a urea pump) 7, a pressure sensor P1 and a liquid inlet connecting pipe 9 with a single-side closed are respectively connected with a pipeline and electrically connected by an aqueous urea solution pipeline and an electric control cable.
Step 1: urea pump inner heating plate temperature sensor and inner temperature sensor fault monitoring
The upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, the control circuit board 5 firstly monitors the ambient temperature of the temperature sensor 6 outside the urea pump and stores and displays the ambient temperature in the upper computer 1 as a calibration parameter Tb; then respectively monitoring the temperatures of a heating plate temperature sensor 73 and an inner temperature sensor 74 in the urea pump, transmitting the temperatures to an upper computer 1 through a communication converter 2, comparing and judging the two temperature monitoring data with the calibration parameter temperature Tb by the upper computer 1, and if one of the two temperature monitoring data exceeds the tolerance range +/-3 ℃, automatically lighting a red light to alarm by the upper computer and displaying a fault area; if the temperature does not exceed the tolerance range +/-3 ℃, the upper computer automatically lights the green light.
And 2, step: urea pump inner heating sheet fault monitoring
The upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, the control circuit board 5 monitors the resistance value of the heating plate 75 in the urea pump, the resistance value is fed back to the upper computer 1 through the communication converter 2 and is compared and judged with the resistance value of the parameter calibrated in the upper computer 1, and if the resistance value exceeds the tolerance range +/-0.5 omega, the upper computer 1 automatically lights a red light to alarm and displays a fault area; if the tolerance range is not exceeded +/-0.5 omega, the upper computer 1 automatically turns green.
And step 3: pressure sensor fault monitoring in urea pumps
The method comprises the following steps: the upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, the control circuit board 5 monitors the pressure of the pressure sensor P276 in the urea pump under the state of not driving the urea pump (7), the pressure is fed back to the upper computer 1 through the communication converter 2, the pressure is compared and judged with a calibrated parameter value in the upper computer 1 (the pressure is between 950mbar and 1050mbar is normal), the upper computer 1 automatically lights a red light to alarm when the pressure exceeds the range, and a fault area is displayed; and measuring green light when the product is qualified.
The method 2 comprises the following steps: the upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, the control circuit board 5 monitors the resistance value of the pressure sensor P2 in the urea pump, the resistance value is fed back to the upper computer 1 through the communication converter 2 and is compared and judged with the resistance value of the parameter calibrated in the upper computer 1, if the resistance value exceeds the range of +/-0.5 omega, the upper computer 1 automatically lights a red light to alarm, and a fault area is displayed; if the range is not beyond +/-0.5 omega, the upper computer 1 automatically turns green.
And 4, step 4: monitoring negative pressure performance during urea pump infusion
The upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, and the control circuit board 5 drives the infusion motor pump 71 to carry out negative pressure test; the control circuit board 5 sets the motor rotating speed of the infusion motor pump 71 to be 3000rpm, the pumping-back electromagnetic pump 72 is in a closed state, as shown in fig. 2 (combined with fig. 1), air flows from the end A to the end B, a negative pressure area is formed at the end A due to the fact that the end A is a liquid inlet connecting pipe 9 with a single-side closed end, the pressure sensor P1 8 monitors the pressure (namely a negative pressure value) of the end A within 20 seconds, the control circuit board 5 transmits the pressure to the upper computer 1 through the communication converter 2 to form a negative pressure change curve graph along with time as shown in fig. 3, and the maximum negative pressure value is judged to be not less than or equal to a calibrated negative pressure value (namely the calibrated negative pressure value is-150 mbar), if the maximum negative pressure value is not qualified, the upper computer 1 automatically turns on a red light to alarm, and a fault area is displayed; if the lamp is qualified, measuring the green lamp.
And 5: positive pressure performance monitoring during urea pump pumpback
The upper computer 1 sends a test instruction to the control circuit board 5 through the communication converter 2, and the control circuit board 5 drives the pumping-back electromagnetic pump 72 to perform positive pressure test; the control circuit board 5 sets the fixed frequency and duty ratio (20 Hz, 50% duty ratio) of the back-pumping electromagnetic pump to operate, the infusion motor pump 71 is in a closed state, as shown in fig. 4 (combined with fig. 1), air flows from the end C to the end A, because the end A is a liquid inlet connecting pipe 9 with a single-side closed, a positive pressure area can be formed at the end A, the pressure sensor P1 8 monitors the pressure (namely, a positive pressure value) of the end A within 20 seconds, the control circuit board 5 transmits the pressure to the upper computer 1 through the communication converter 2 to form a time positive pressure change curve chart as shown in fig. 4, and judges that the minimum positive pressure value is not more than or equal to a calibration positive pressure value (namely, the calibration positive pressure value is 100 mbar), if the minimum positive pressure value is not more than or less than the calibration positive pressure value, the upper computer 1 automatically lights a red light to alarm, and displays a fault area; and when the product is qualified, the lamp is turned on to be green.
In the test process, the steps 1 to 5 have no requirement on the detection sequence.
The invention provides a test system and a test method of a non-air-assisted urea pump in a dry state, which mainly aim at solving the problem of the failure performance verification of an electric control part of the urea pump,and the verification of the positive and negative pressure performance of the infusion and the back-pumping. And the verification of the performances can judge whether the working performance of the urea pump can meet the requirements or not and directly influence whether the aftertreatment urea pump of the diesel vehicle can work normally or not. For example, if the minimum negative pressure of the same urea pump tested for infusion in a dry state is P g0 The requirement of negative pressure performance is met, and the minimum value of the negative pressure when the wet urea pump is used for monitoring the liquid delivery is P in practical application g1 Will be less than the above-mentioned negative pressure value P absolutely g0 The minimum negative pressure of the urea pump in the dry state is P g0 Whether the negative pressure performance requirement is met or not can be concluded that the urea pump can meet the negative pressure performance requirement in practical application; also assume that the maximum positive pressure value when the same urea pump is tested for pumpback in the dry state is P g2 The requirement of positive pressure performance is met, and the maximum value of the positive pressure when the wet urea pump is used for monitoring the back pumping is P in practical application g3 Will be absolutely greater than the positive pressure value P g2 The maximum positive pressure value P is then measured in the dry state by this urea pump during the withdrawal g2 Whether the negative pressure performance requirement is met or not can be concluded that the urea pump can meet the positive pressure performance requirement in practical application; therefore, whether the infusion and the pumping performance of the urea pump meet the requirements in practical application can be deduced according to whether the negative pressure during the infusion of the urea pump and the positive pressure during the pumping back meet the requirements in a dry state. Of course, it can be determined whether the positive pressure at the time of the urea pump feeding and the negative pressure at the time of the pumping back satisfy the requirements or not by testing in a dry state, for example, if the maximum positive pressure at the time of the urea pump feeding is tested in a dry state is P g0 Meet the performance requirement, and in practical application, the positive pressure when the wet urea pump is used for transfusion is monitored to be P g1 Absolute value greater than the above positive pressure value P g0 '; also provided that the minimum negative pressure at which the urea pump test satisfies pumpback in the dry state is P g2 ' however, in practical application, the negative pressure when the wet urea pump pumps back is monitored to be P g3 Absolute value less than the above-mentioned negative pressure value P g2 Therefore, whether or not the positive pressure at the time of urea pump infusion and the negative pressure at the time of suction meet the requirements may be tested in a dry stateAnd deducing whether the infusion and the back-pumping performance of the urea pump meet the requirements in practical application. Therefore, the defects of the urea pump in the liquid conveying and back pumping can be effectively, simply and early judged, so that the subsequent performance test of the urea pump is facilitated, the test difficulty is saved, the resource is saved, the development test progress is improved, and the reliability of the urea pump of the diesel vehicle post-treatment device is more facilitated.
The invention is characterized in that the urea pump is controlled by the communication converter instruction control circuit board to carry out test work through software parameter calibration in the upper computer, and the performances of an electric control part, positive pressure, negative pressure and the like in the urea pump can be tested. Although the embodiment is exemplified by a urea pump composed of an independent infusion motor pump and an independent pumping electromagnetic pump, the test system and the test method thereof can also be used for testing a urea pump composed of an infusion pumping gear pump in which an infusion motor pump and a pumping electromagnetic pump are combined into one. The scope of the invention is described in the claims, but any modifications that include the gist of the invention are within the scope of the invention.
Claims (11)
1. A test system of a dry non-air-assisted urea pump is characterized by mainly comprising an upper computer (1), a communication converter (2), a rack power module (3), a control circuit board (5), an external temperature sensor T0 (6), a urea pump (7) with a transfusion port, a liquid return port and a jet orifice, a pressure sensor P1 (8) and a liquid inlet connecting pipe (9) with a single side sealed; a pressure sensor P2 (76), an internal temperature sensor T2 (74), a heating sheet (75) for unfreezing and insulating a urea aqueous solution pipeline in the urea pump (7) and a heating sheet temperature sensor T1 (73) are also arranged in the urea pump (7);
the single-side sealed liquid inlet connecting pipe (9) is connected to a liquid inlet of the urea pump (7) through a pressure sensor P1 (8);
the communication converter (2) is electrically connected with the upper computer (1) and the control circuit board (5) respectively; the control circuit board (5) is respectively and electrically connected with the urea pump (7), the external temperature sensor T0 (6) and the pressure sensor P1 (8); the rack power supply module (3) converts 220V alternating current into direct current to supply to the control circuit board (5).
2. The test system according to claim 1, wherein the upper computer monitors the temperature of the heating sheet temperature sensor T1 and the inner temperature sensor T2 in the urea pump, the resistance value of the heating sheet, and the resistance value or the pressure of the pressure sensor P2 through the communication converter by the control circuit board, controls the urea pump to perform output/back-pumping pressure monitoring respectively by the pressure sensor P1, and transmits the monitored data to the upper computer for storage and judgment and analysis.
3. The test system of claim 1,
the upper computer (1): the system comprises a host, a display, test system software and a keyboard, and is used for storing and running a test system program; transmitting the test instruction to a control circuit board (5) through a communication converter (2), and simultaneously: 1) Receiving the monitoring temperature or resistance/pressure data of the urea pump converted by the communication converter (2) by the control circuit board (5), comparing the monitoring temperature or resistance/pressure data with corresponding calibration parameters, judging and storing the monitoring data, if the comparison is unqualified, automatically turning on a red light to display a fault area, and if the comparison is qualified, automatically turning on a green light; and 2) receiving the monitoring pressure data converted by the communication converter (2) in the process of controlling the urea pump (7) to transfuse/withdraw by the control circuit board (5) and transmitting the monitoring pressure data to the upper computer (1) to form corresponding curves respectively, judging whether the curve is a pressure rise/fall curve graph along with time, judging whether the monitored maximum positive pressure value/minimum negative pressure value reaches the corresponding calibrated maximum positive pressure value/minimum negative pressure value, if not, automatically lighting a red light to display corresponding fault information, and if so, automatically lighting a green light;
the communication converter (2): the device is used for converting a test instruction in the upper computer (1) into current or voltage and transmitting the current or voltage to the control circuit board (5) for control or monitoring; meanwhile, the monitoring data of the control circuit board (5) is converted and then transmitted and stored in the upper computer (1);
the rack power module (3): the alternating current of 220V is converted into direct current to be supplied to a control circuit board (5);
the control circuit board (5): the urea pump control system is used for receiving an electric signal which is transmitted by the upper computer (1) and converted by the communication converter (2) through a test instruction, monitoring or controlling and monitoring the performance of the urea pump, and simultaneously converting the monitored data into a corresponding data signal through the communication converter (2) and transmitting and storing the data signal in the upper computer (1);
the pressure sensor P1 (8): the device is used for monitoring the pressure of the urea pump (7) during negative pressure detection and positive pressure detection, and the pressure is transmitted through the communication converter (2) through the control circuit board (5) and stored in the upper computer (1);
the outer temperature sensor T0 (6): the urea pump temperature monitoring device is used for monitoring the environmental temperature outside the urea pump (7), and monitoring temperature data are transmitted and stored in the upper computer (1) through the communication converter (2) through the control circuit board (5).
4. A test system according to claim 3, wherein the monitored, or controlled and monitored, urea pump performance comprises at least the following:
1) Monitoring temperature signals of a heating sheet temperature sensor T1 (73) and an inner temperature sensor T2 (74) in the urea pump (7);
2) Monitoring the resistance value of a heating sheet (75) in the urea pump (7);
3) Monitoring the pressure of a pressure sensor P2 (76) in the urea pump (7);
4) Controlling a urea pump (7) to carry out negative pressure detection through a pressure sensor P1 (8);
5) And monitoring the pressure sensor P1 (8) of the urea pump (7) to detect the positive pressure.
5. The testing system according to claim 1 or 2 or 3 or 4, characterized in that the urea pump (7) further comprises an infusion motor pump (71), a pumpback electromagnetic pump (72), a filter (77) and a one-way liquid return valve (78); the urea pump (7) infusion port, the infusion motor pump (71), the filter (77) and the urea pump (7) injection port are sequentially connected through a urea aqueous solution pipeline to form an urea pump (7) infusion loop, the pumping-back electromagnetic pump (72) is connected in parallel to two ends of the infusion motor pump (71) through a urea aqueous solution pipeline, and a urea aqueous solution pipeline which sequentially connects the pressure sensor P2 (76) and the one-way liquid return valve (78) to the urea pump (7) liquid return port is connected between the filter (77) and the urea pump (7) injection port in a connected urea aqueous solution pipeline.
6. The test system according to claim 5, characterized in that the test system further comprises an emergency stop switch (4), the emergency stop switch (4) being electrically connected with and arranged between the bench power supply module (3) and the control circuit board (5).
7. A test method based on the test system of claim 1 or 3, characterized by comprising at least the following test items:
the method comprises the following steps of monitoring faults of a heating plate temperature sensor and an inner temperature sensor in the urea pump, monitoring faults of the heating plate in the urea pump, monitoring faults of a pressure sensor in the urea pump, monitoring negative pressure performance during urea pump infusion and monitoring positive pressure performance during urea pump pumping.
8. The test method according to claim 7,
the urea pump internal heating plate temperature sensor and the internal temperature sensor monitor: the upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), the control circuit board (5) firstly monitors the ambient temperature of the temperature sensor T0 (6) outside the urea pump, and the ambient temperature is stored and displayed in the upper computer (1) as a calibration parameter Tb; the temperatures of a heating plate temperature sensor T1 (73) and an inner temperature sensor T2 (74) in the urea pump are respectively monitored and transmitted to an upper computer (1) through a communication converter (2), the upper computer (1) compares the two temperature monitoring data with the calibration parameter temperature Tb for judgment, and if one of the two temperature monitoring data exceeds a calibration temperature range, the upper computer automatically lights a red light for alarm, and a fault area is displayed; if the temperature of the upper computer is not beyond the range of the calibration temperature, the upper computer automatically turns on the green light;
monitoring faults of the heating plates in the urea pump: the upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), the control circuit board (5) monitors the resistance value of a heating plate (75) in the urea pump, the resistance value is fed back to the upper computer (1) through the communication converter (2), the comparison and judgment are carried out with the calibrated resistance value range in the upper computer (1), if the resistance value range exceeds the calibrated resistance value range, the upper computer (1) automatically lights a red light to give an alarm, and a fault area is displayed; if the resistance value does not exceed the calibrated resistance value range, the upper computer (1) automatically turns green;
monitoring the fault of the pressure sensor in the urea pump:
1) The upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), the control circuit board (5) monitors the pressure of the pressure sensor P2 (76) in the urea pump under the state of not driving the urea pump (7), the pressure is fed back to the upper computer (1) through the communication converter (2), the pressure is compared with the range of the standard pressure in the upper computer (1) for judgment, if the pressure exceeds the range of the standard pressure, the upper computer (1) automatically lights a red light for alarm, and a fault area is displayed; if the pressure does not exceed the range of the calibrated pressure, the upper computer (1) automatically lights the green light;
or 2) the upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), the control circuit board (5) monitors the resistance value of the pressure sensor P2 (76) in the urea pump, the resistance value is fed back to the upper computer (1) through the communication converter (2), the resistance value is compared and judged with a calibrated resistance value range in the upper computer (1), if the resistance value exceeds the calibrated resistance value range, the upper computer (1) automatically lights a red light to give an alarm, and a fault area is displayed; if the resistance value does not exceed the calibrated resistance value range, the upper computer (1) automatically turns green;
and (3) monitoring the negative pressure performance of the urea pump during infusion:
the upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), and the control circuit board (5) drives the urea pump to transfuse liquid to carry out negative pressure test; a negative pressure area is formed in the liquid inlet connecting pipe (9) with the single-side closed, a pressure sensor P1 (8) monitors the negative pressure value of the liquid inlet connecting pipe (9) with the single-side closed in 20 seconds, the negative pressure value is transmitted to the upper computer (1) through the communication converter (2) by the control circuit board (5), a time negative pressure change curve graph is formed, the maximum negative pressure value is judged to be smaller than a calibrated negative pressure value, if the maximum negative pressure value is not qualified, the upper computer (1) automatically lights a red light for alarming, and a fault area is displayed; otherwise, turning on a green light when the color is qualified;
monitoring the positive pressure performance of the urea pump during pumping back: the upper computer (1) sends a test instruction to the control circuit board (5) through the communication converter (2), and the control circuit board (5) drives the urea pump to perform positive pressure test; a positive pressure area is formed in a single-side closed liquid inlet connecting pipe (9) connected with a liquid inlet of a urea pump, a pressure sensor P1 (8) monitors a positive pressure value in 20 seconds in the single-side closed liquid inlet connecting pipe (9), a control circuit board (5) transmits the positive pressure value to an upper computer (1) through a communication converter (2) to form a positive pressure change curve graph along with time, and judges that the minimum positive pressure value is greater than a calibration positive pressure value, and when the minimum positive pressure value is unqualified, the upper computer (1) automatically turns on a red light to alarm and displays a fault area; otherwise, the lamp is turned on when the lamp is qualified.
9. The test method according to claim 8, wherein the calibration temperature range is ± 3 ℃, the calibration resistance range is ± 0.5 Ω, the calibration pressure range is 950mbar-1050mbar, the calibration negative pressure value is-150 mbar, and the calibration positive pressure value is 100mbar.
10. Test method according to claim 8 or 9, characterized in that the urea pump (7) further comprises an infusion motor pump (71), a suck-back solenoid pump (72), a filter (77) and a one-way liquid return valve (78); the urea pump (7) infusion port, the infusion motor pump (71), the filter (77) and the urea pump (7) injection port are sequentially connected through a urea aqueous solution pipeline to form an urea pump (7) infusion loop, the pumping-back electromagnetic pump (72) is connected in parallel to two ends of the infusion motor pump (71) through a urea aqueous solution pipeline, and a urea aqueous solution pipeline which sequentially connects the pressure sensor P2 (76) and the one-way liquid return valve (78) to the urea pump (7) liquid return port is connected between the filter (77) and the urea pump (7) injection port in a connected urea aqueous solution pipeline.
11. The testing method according to claim 10, characterized in that the testing system further comprises an emergency stop switch (4), the emergency stop switch (4) being electrically connected with and arranged between the bench power supply module (3) and the control circuit board (5).
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| US6063350A (en) * | 1997-04-02 | 2000-05-16 | Clean Diesel Technologies, Inc. | Reducing nox emissions from an engine by temperature-controlled urea injection for selective catalytic reduction |
| JP4406890B2 (en) * | 2006-09-01 | 2010-02-03 | 株式会社タツノ・メカトロニクス | Weighing machine |
| JP5325850B2 (en) * | 2009-10-30 | 2013-10-23 | ボッシュ株式会社 | Abnormality detection device and abnormality detection method for reducing agent injection valve, and exhaust purification device for internal combustion engine |
| EP2876270B1 (en) * | 2012-07-19 | 2017-07-12 | Toyota Jidosha Kabushiki Kaisha | Additive supply device for internal combustion engine |
| KR101655201B1 (en) * | 2015-03-09 | 2016-09-07 | 현대자동차 주식회사 | Urea solution pump unit |
| JP6508475B2 (en) * | 2015-10-27 | 2019-05-08 | 株式会社デンソー | Diagnostic device |
| CN107178493B (en) * | 2017-06-22 | 2020-10-09 | 北京一雄信息科技有限公司 | Urea pump detecting system |
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