阅读说明：本技术 一种尿素泵功能测试系统及其方法 (Urea pump function testing system and method ) 是由 王永顺 王祥 赵祥智 王晓祥 于 2019-10-21 设计创作，主要内容包括：本发明属于尿素泵技术领域,尤其为一种尿素泵功能测试系统,包括PC上位机、控制电路板、喷嘴系统、尿素泵系统、尿素罐、压力传感器、电磁阀和条码枪；本发明采用此设计测试系统具有高精密性,能够毫升级高精度测试；自动化程度高,配置测试参数后,能够自动化完成多种工况下功能测试,有效提高了测试效率；具备扩展性,可以适应多种标准协议下功能测试；测试成本低,测试过程使用的液体尿素可循环使用,测试所使用传感器均可采用通用传感器。(The invention belongs to the technical field of urea pumps, and particularly relates to a urea pump function testing system which comprises a PC (personal computer) upper computer, a control circuit board, a nozzle system, a urea pump system, a urea tank, a pressure sensor, an electromagnetic valve and a bar code gun; the testing system adopting the design has high precision and can perform milliliter-level high-precision testing; the automation degree is high, and after test parameters are configured, functional tests under various working conditions can be automatically completed, so that the test efficiency is effectively improved; the method has expansibility, and can be suitable for function tests under various standard protocols; the test cost is low, the liquid urea used in the test process can be recycled, and all sensors used in the test can adopt universal sensors.)

1. A urea pump functional test system which characterized in that: the device comprises a PC upper computer, a control circuit board, a nozzle system, a urea pump system, a urea tank, a pressure sensor, an electromagnetic valve and a bar code gun;

wherein:

the bar code gun is in signal connection with the PC upper computer and is used for controlling and recording a label of the urea pump and recording test data of a product for database management;

the PC upper computer is connected with the control circuit board through a CAN signal, the control circuit board converts a request instruction of the PC upper computer into a physical signal to control the urea pump system, the nozzle system and the electromagnetic valve, and simultaneously acquires a related parameter physical signal, converts the related parameter physical signal into a CAN signal and feeds back the CAN signal to the PC upper computer;

the PC upper computer is in signal connection with the pressure sensor and is used for collecting data of the weighing meter.

2. A method of testing a system for urea pump functionality according to claim 1, wherein: the method comprises the following steps:

s1, installing a product to be tested: scanning a code by a bar code gun, and establishing database information of a test product;

s2, running PC upper computer software: carrying out self-checking diagnosis;

s3, pressure build stage diagnosis: firstly, controlling the closing (normally open) of an electromagnetic valve and the rotating speed of a motor to prevent urea from entering a pump from a liquid inlet tank of a urea tank to establish negative pressure;

s4, detecting the pump pressure stability of the zero injection quantity: after pressure building is successful, the stability of the pump pressure under the requirement of zero injection amount can be verified through data such as the pressure value in the pump;

s5, automatic detection of different injection quantities: the upper computer software automatically controls the test system to operate under corresponding working conditions according to the configured injection amount test requirement, controls the nozzle system to open the valve to perform injection, verifies the stability of the pump pressure through the pressure value in the pump, and simultaneously verifies whether the injection amount is consistent with the requirement through the weighing meter;

s6, detecting the pumping back function: the upper computer simulates a pumping-back command sent to the urea pump and detects whether the qualification of the pumping-back function is verified through the pressure value in the pump within the specified time;

s7, data storage: after the product function test is completed, the test data is automatically stored in the database so as to facilitate the analysis and the tracing of the test data.

3. A urea pump functional test system according to claim 1, characterized in that: in S2, the self-test diagnosis includes protocol standards of the urea pump, sensors and motors in the pump, sensors related to the test system, and solenoid valves.

4. A urea pump functional test system according to claim 1, characterized in that: in S3, the control of the opening of the solenoid valve after the negative pressure is established detects whether the pump has the capability of establishing the pump pressure.

Technical Field

The invention belongs to the technical field of urea pumps, and particularly relates to a system and a method for testing functions of a urea pump.

Background

With the continuous improvement of the living standard of people, automobiles gradually become common consumer goods to go to the public, and then harmful gas emitted by large quantity of automobiles has great influence on the air quality. Therefore, the treatment of the automobile exhaust emission is particularly important, and the nation also provides a series of standards (nation four, nation five and nation six) for the automobile exhaust emission.

One important item in the automobile exhaust treatment of the diesel engine is to achieve the purpose of exhaust treatment by utilizing the chemical reaction of the diesel engine exhaust treatment liquid (urea) and the exhaust. The control of the injection amount of the exhaust gas treatment liquid is one of the core technologies of the exhaust emission treatment of the diesel engine, and the urea pump is used as a core execution mechanism. Therefore, the function test of the urea pump aiming at the exhaust emission is also very important.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides a urea pump function test system and a method thereof, and has the characteristics that the test system has high precision, can perform milliliter-level high-precision test, has high automation degree, can automatically complete function tests under various working conditions after test parameters are configured, effectively improves the test efficiency, has expansibility, can adapt to the function tests under various standard protocols, has low test cost, and can recycle liquid urea used in the test process.

In order to achieve the purpose, the invention provides the following technical scheme: a urea pump function test system comprises a PC upper computer, a control circuit board, a nozzle system, a urea pump system, a urea tank, a pressure sensor, an electromagnetic valve and a bar code gun;

wherein:

the bar code gun is in signal connection with the PC upper computer and is used for controlling and recording a label of the urea pump and recording test data of a product for database management;

the PC upper computer is connected with the control circuit board through a CAN signal, the control circuit board converts a request instruction of the PC upper computer into a physical signal to control the urea pump system, the nozzle system and the electromagnetic valve, and simultaneously acquires a related parameter physical signal, converts the related parameter physical signal into a CAN signal and feeds back the CAN signal to the PC upper computer;

the PC upper computer is in signal connection with the pressure sensor and is used for collecting data of the weighing meter.

A method of a urea pump functional test system: the method comprises the following steps:

s1, installing a product to be tested: scanning a code by a bar code gun, and establishing database information of a test product;

s2, running PC upper computer software: carrying out self-checking diagnosis;

s3, pressure build stage diagnosis: firstly, controlling the closing (normally open) of an electromagnetic valve and the rotating speed of a motor to prevent urea from entering a pump from a liquid inlet tank of a urea tank to establish negative pressure;

s4, detecting the pump pressure stability of the zero injection quantity: after pressure building is successful, the stability of the pump pressure under the requirement of zero injection amount can be verified through data such as the pressure value in the pump;

s5, automatic detection of different injection quantities: the upper computer software automatically controls the test system to operate under corresponding working conditions according to the configured injection amount test requirement, controls the nozzle system to open the valve to perform injection, verifies the stability of the pump pressure through the pressure value in the pump, and simultaneously verifies whether the injection amount is consistent with the requirement through the weighing meter;

s6, detecting the pumping back function: the upper computer simulates a pumping-back command sent to the urea pump and detects whether the qualification of the pumping-back function is verified through the pressure value in the pump within the specified time;

s7, data storage: after the product function test is completed, the test data is automatically stored in the database so as to facilitate the analysis and the tracing of the test data.

As a preferred technical solution of the method for testing a function of a urea pump according to the present invention, in S2, the self-test diagnosis includes a protocol standard of the urea pump, a sensor and a motor in the pump, a sensor related to the test system, and an electromagnetic valve.

As a preferred technical solution of the method for testing the function of the urea pump, in S3, after the negative pressure is established, the opening of the electromagnetic valve is controlled to detect whether the pump has the capability of establishing the pump pressure.

Compared with the prior art, the invention has the beneficial effects that:

1. the test system has high precision and can perform milliliter-level high-precision test.

2. The automation degree is high, and after the test parameters are configured, the function test under various working conditions can be automatically completed, so that the test efficiency is effectively improved.

3. The method has expansibility and can adapt to function tests under various standard protocols.

4. The test cost is low, the liquid urea used in the test process can be recycled, and all sensors used in the test can adopt universal sensors.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow chart of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1;

FIG. 1 is a flow chart of the present invention;

a urea pump function test system comprises a PC upper computer, a control circuit board, a nozzle system, a urea pump system, a urea tank, a pressure sensor, an electromagnetic valve and a bar code gun;

wherein:

the bar code gun is in signal connection with the PC upper computer and is used for controlling and recording a label of the urea pump and recording test data of a product for database management;

the PC upper computer is connected with the control circuit board through a CAN signal, the control circuit board converts a request instruction of the PC upper computer into a physical signal to control the urea pump system, the nozzle system and the electromagnetic valve, and simultaneously acquires a related parameter physical signal, converts the related parameter physical signal into a CAN signal and feeds back the CAN signal to the PC upper computer;

the PC upper computer is in signal connection with the pressure sensor and is used for collecting data of the weighing meter.

Further, the method comprises the following steps:

the invention also provides a method for the function test system of the urea pump, which comprises the following steps:

s1, installing a product to be tested: scanning a code by a bar code gun, and establishing database information of a test product;

s2, running PC upper computer software: carrying out self-checking diagnosis;

s3, pressure build stage diagnosis: firstly, controlling the closing (normally open) of an electromagnetic valve and the rotating speed of a motor to prevent urea from entering a pump from a liquid inlet tank of a urea tank to establish negative pressure;

s4, detecting the pump pressure stability of the zero injection quantity: after pressure building is successful, the stability of the pump pressure under the requirement of zero injection amount can be verified through data such as the pressure value in the pump;

s5, automatic detection of different injection quantities: the upper computer software automatically controls the test system to operate under corresponding working conditions according to the configured injection amount test requirement, controls the nozzle system to open the valve to perform injection, verifies the stability of the pump pressure through the pressure value in the pump, and simultaneously verifies whether the injection amount is consistent with the requirement through the weighing meter;

s6, detecting the pumping back function: the upper computer simulates a pumping-back command sent to the urea pump and detects whether the qualification of the pumping-back function is verified through the pressure value in the pump within the specified time;

s7, data storage: after the product function test is completed, the test data is automatically stored in the database so as to facilitate the analysis and the tracing of the test data.

In an alternative embodiment: in S2, the self-test diagnosis includes protocol standards of the urea pump, sensors and motors in the pump, sensors related to the test system, and solenoid valves.

In an alternative embodiment: in S3, the control of the opening of the solenoid valve after the negative pressure is established detects whether the pump has the capability of establishing the pump pressure.

Further, the method comprises the following steps:

the invention relates to a function test system of a urea pump, which aims at a key part of automobile exhaust emission. The urea pump has the main function of accurately controlling the rotating speed of a motor of the urea pump according to an ECU instruction, so that the pressure in the pressure stabilizing cavity is stabilized at about 9 Bar. The ECU, the urea pump and the nozzle form a closed loop system, and the pressure stabilization of the pressure stabilizing cavity is the most critical loop of the precision of the system.

Aiming at the functional test requirements, the invention designs a set of automatic test system capable of completing the urea pump under different injection quantity requirements. The test system can be configured with different injection quantity test requirements, and after the product is installed, the function test of the related product can be completed within a specified time by running the upper computer software; the test system has a self-checking function, and can accurately and effectively verify the qualification of the product; meanwhile, the test system has expansibility and can verify the functions of the urea pumps under different standards (national fourth, national fifth and national sixth).

The function test system of the urea pump is a set of closed-loop control system and mainly comprises a PC upper computer, a control circuit board, a nozzle system, a urea pump system (product to be tested), a urea tank, a sensor, an electromagnetic valve, a bar code gun and the like. The bar code gun records the label of the urea pump through the upper computer control so as to record the test data of the product for database management. The upper computer communicates with the control circuit board through a Controller Area Network (CAN), the control circuit board converts a request instruction of the upper computer into a physical signal to control the urea pump system, the nozzle system and the electromagnetic valve, and simultaneously acquires a related parameter physical signal, converts the related parameter physical signal into a CAN signal and feeds the CAN signal back to the upper computer. The upper computer directly collects data of sensors such as the weighing meter and the like, and the data are used as important parameter indexes for judging whether the product is qualified or not.

The invention has the following remarkable advantages:

1. the test system has high precision and can perform milliliter-level high-precision test;

2. the automation degree is high, and after test parameters are configured, functional tests under various working conditions can be automatically completed, so that the test efficiency is effectively improved;

3. the method has expansibility, and can be suitable for function tests under various standard protocols;

4. the test cost is low, the liquid urea used in the test process can be recycled, and all sensors used in the test can adopt universal sensors.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.