Multi-configuration metering injection pump identification method

Abstract

The invention discloses a method for identifying a multi-configuration metering injection pump. The method comprises the following steps: S1, initializing an ECU (Electronic Control Unit); s2, sending a first identification signal to the metering injection pump interface for a single period; s3, acquiring a first return signal; s4, the first return signal is analyzed; if the injection pump can be identified, entering a subsequent step; if the injection pump cannot be identified, returning to the step S2; s5, sending a second pairing signal to the metering injection pump interface; s6, acquiring a second return signal; and S7, the control strategy is executed, and the injection pump is operated and started. The power consumption loss of the system can be reduced; the system processing efficiency is improved; the recognition speed is improved. Moreover, the system is suitable for pumps with various signals, is good in expansibility, and has adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine integrated components, in particular to a multi-configuration metering injection pump identification method. BACKGROUND

[0002] Metering injection pump is a composite pump type combining metering injection pump precise flow control and jet pump fluid power transmission, which is used in scenarios where high-precision metering delivery and suction or mixing are required for engines. By adjusting the pressure or flow of the working fluid to control the injection intensity, the suction amount of the delivered fluid of the engine is accurately adjusted.

[0003] In the engine SCR (Selective Catalytic Reduction) system, the metering injection pump is the core component for accurate injection of urea solution, and its performance directly affects the NOx purification efficiency. The existing technology has the following technical pain points:

[0004] Poor model adaptability: the same engine platform needs to adapt to metering injection pumps from different suppliers, and the electrical parameters and control logic of each model are different, which requires the development of independent control software for each pump type, increasing maintenance costs.

[0005] On-site configuration problems: relying on technical personnel to manually configure the pump model on site by inputting the pump model, which results in low work efficiency, increases the learning cost of technical personnel, and may cause technical errors, affecting the use experience or causing danger.

[0006] The information disclosed in the background section of this document is only intended to increase the understanding of the overall background of the present application and should not be considered as an acknowledgment or implicit indication that such information forms the prior art known to those skilled in the art. SUMMARY

[0007] The purpose of the present application is to provide a multi-configuration metering injection pump identification method that can solve the problems in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides a multi-configuration metering injection pump identification method, comprising the following steps: S1: ECU initialization; S2: sending a first identification signal to the metering injection pump interface for a single cycle; S3: obtaining a first return signal; S4: analyzing the first return signal; if the injection pump can be identified, proceed to the next step; if the injection pump cannot be identified, return to step S2; S5: sending a second pairing signal to the metering injection pump interface; S6: obtaining a second return signal; S7: executing a control strategy to start the injection pump.

[0009] In one or more embodiments, the step S1 comprises: S11, powering on T15; S12, verifying the circuit; S13, performing a system self-check.

[0010] In one or more embodiments, the step S2 comprises: S21, the system acquires a user instruction, determines the duration of the single cycle; S22, the system updates the metering injection pump instruction library, establishes a calibration quantity; S23, acquires the user's assignment of the calibration quantity, generates a first identification signal based on the assignment of the calibration quantity; S24, sends the first identification signal to the metering injection pump interface.

[0011] In one or more embodiments, the step S22 further comprises: S221, the system checks the current version state; S222, determines the update target according to the current version state; S223, updates a single library; S224, repeats step S223 to traverse all libraries and perform batch updates; S225, defines a variable SCR_stEnaPmpTyp_C as the calibration quantity; S226, determines the value range of the calibration quantity.

[0012] In one or more embodiments, the step S23 further comprises: S231, the system acquires a user state instruction; S232, the system determines the attribute of the first identification signal instruction; S233, sends the first identification signal of the corresponding attribute; wherein the attribute of the first identification signal instruction includes manual identification and automatic identification.

[0013] In one or more embodiments, when the attribute of the first identification signal instruction is manual identification, the step S232 further comprises: S2321', acquires the user's assignment of the calibration quantity, assigns the calibration quantity as a determined value; S2322', the system identifies the calibration quantity assignment, searches the metering injection pump instruction library, and acquires the message content corresponding to the first identification signal instruction; S2323', according to the calibration quantity assignment, identifies the corresponding metering injection pump interface, if the corresponding metering injection pump interface is not connected to the metering injection pump, waits for the metering injection pump to be connected; S2324', according to the calibration quantity assignment and the message content, sends the corresponding message content to the metering injection pump interface at the corresponding position.

[0014] In one or more embodiments, when the attribute of the first identification signal instruction is automatic identification, the step S232 further comprises: S2321": obtaining the user's assignment of the calibration quantity, assigning the calibration quantity as 2 / N+1; S2322": the system enters an automatic identification state; S2323": setting a timer to perform electrical fault diagnosis; S2324": if the system has an electrical fault, jumping to the intermediate state SCR_stSysVrnt&SCR_stSysVrntEEPChc=FF and ending the process; S2325": if the system meets the electrical condition, the ECU sends a request for full identification message to the metering injection pump interface.

[0015] In one or more embodiments, the step S4 further comprises: S41: receiving a first return signal and identifying information carrying the pump type; S42: reading the information carrying the pump type and writing the pump type into the calibration quantity.

[0016] In one or more embodiments, the step S5 further comprises: S51: the ECU looks up the injection pump instruction library according to the pump type and generates a control instruction; S52: sending the control instruction as the second pairing signal.

[0017] Compared with the prior art, the multiple technical solutions and embodiments provided by the present application at least include the following technical effects or advantages:

[0018] By performing multiple timing steps, the system power consumption loss is reduced; by manual identification through the preset mode, the processing efficiency is improved; by the automatic identification mode that can determine the metering injection pump model in a single time, the identification speed is improved. The present application can adapt to pumps of multiple signals and has good expansibility and adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application, which can be considered as a combination of preferred embodiments and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram of the overall flow of a multiple configuration metering injection pump identification method provided by the present application;

[0021] Figure 2 A schematic diagram of the program flow of a multiple configuration metering injection pump identification method provided by the present application;

[0022] Figure 3 In the program flow of a multiple configuration metering injection pump identification method provided by the present application, a schematic diagram of the program flow of the identification function module. DETAILED DESCRIPTION

[0023] Unless otherwise defined, the terms "includes", "containing", "including", "has", "having", "with" and the like are to be construed to be open-ended terms that mean "consisting of, but not limited to".

[0024] The purpose of the present application is to provide a multi-configuration metering injection pump identification method which is suitable for different models and can not only optimize manual configuration of metering injection pumps but also perform automatic identification of metering injection pumps.

[0025] Embodiment one:

[0026] The embodiment provides a multi-configuration metering injection pump identification method, which comprises the following steps:

[0027] S1: ECU initialization;

[0028] As a preferred embodiment of the embodiment, the step S1 comprises:

[0029] S11: power on T15;

[0030] S12: circuit verification;

[0031] S13: system self-check.

[0032] S2: sending a first identification signal to a metering injection pump interface for a single period;

[0033] Specifically, in order to adapt to the identification methods of metering injection pumps of different models and avoid the increase of power consumption caused by continuous identification, the embodiment determines the model of the metering injection pump by sending an identification signal to the metering injection pump, identifying the difference between the return signals of different metering injection pumps, and establishing an electrical signal connection with the metering injection pump by using a communication mode corresponding to the model; by setting a period threshold, the system retries a limited number of times within a reasonable metering injection pump response time, and stops identification when the single period is exceeded, thereby avoiding resource waste.

[0034] As a preferred embodiment of the embodiment, the step S2 comprises:

[0035] S21: the system obtains a user instruction and determines the length of the single period;

[0036] S22: the system updates a metering injection pump instruction library and establishes a calibration quantity;

[0037] S23: obtaining a user assignment of the calibration quantity, and generating a first identification signal based on the assignment of the calibration quantity;

[0038] S24: sending the first identification signal to the metering jet pump interface.

[0039] Specifically, step S2 specifies the content, duration and target of the first identification signal sending. The application adds a calibration quantity (SCR_stEnaPmpTyp_C) in the software application layer. A user can write a calibration value according to a requirement, for example, 0 / 1 / 2. The value of the calibration quantity corresponds to the serial number of the metering jet pump model in the jet pump instruction library. The system plans the way of identifying the jet pump model by inputting the initial value of the user. After determining the jet pump model, the system can modify the calibration value, and then establish a control relationship with the metering jet pump by the corresponding metering jet pump model instruction.

[0040] As a preferred embodiment of the present embodiment, step S22 further comprises:

[0041] S221: the system checks the current version state;

[0042] S222: according to the current version state, the update target is determined;

[0043] S223: a single library is updated;

[0044] S224: step S223 is repeated to traverse all libraries and perform batch updating;

[0045] S225: a variable SCR_stEnaPmpTyp_C is defined as the calibration quantity;

[0046] S226: the value range of the calibration quantity is determined.

[0047] Specifically, a user can continuously input the metering jet pump instruction content of a new model or a special model into the system by updating. The value of the calibration quantity is determined based on the number of metering jet pump models imported into the system, and can take a special value to perform a specific operation.

[0048] As a preferred embodiment of the present embodiment, step S23 further comprises:

[0049] S231: the system obtains the state instruction of the user;

[0050] S232: the system determines the attribute of the first identification signal instruction;

[0051] S233: the first identification signal corresponding to the attribute is sent;

[0052] The attribute of the first identification signal instruction includes manual identification and automatic identification.

[0053] Specifically, the specific operation includes an automatic identification mode, a manual identification mode, a requirement that a user himself determines an installation type of the metering injection pump, and a determination of a value of the calibration quantity that is entered in advance in the system. The application provides a mode of automatically identifying a type of the injection pump.

[0054] As a preferred embodiment of the present embodiment, when the attribute of the first identification signal instruction is manual identification, the step S232 further includes:

[0055] S2321': obtaining a value of the calibration quantity assigned by the user and assigning the calibration quantity as a determined value;

[0056] S2322': the system identifies the assigned calibration quantity, searches a metering injection pump instruction library, and obtains a message content corresponding to the first identification signal instruction;

[0057] S2323': according to the assigned calibration quantity, the corresponding metering injection pump interface is identified, and if the corresponding metering injection pump interface is not connected to the metering injection pump, the metering injection pump is waited to be connected;

[0058] S2324': according to the assigned calibration quantity and the message content, the corresponding message content is sent to the metering injection pump interface at the corresponding position.

[0059] Specifically, as the manual identification mode, the present embodiment designs the manual identification mode and further improves that the user can skip the automatic identification step by pre-setting the type of the metering injection pump, the system directly interacts with the metering injection pump, and the subsequent operation is saved.

[0060] The manual identification is suitable for a scenario where the pump type is used explicitly. For example, after the calibration quantity is assigned as 0, the T15 is powered on, the ECU is initialized, the pump type 1 is directly written into the SCR_stSysVrnt & SCR_stSysVrntEEPChc pump state quantity, the initialization is completed, and the pump type can be matched without installing the pump.

[0061] The manual writing of the pump type greatly accelerates the software running speed, and the communication with the pump is not needed to complete. Meanwhile, the pump type can be extended to more than two.

[0062] As a preferred embodiment of the present embodiment, when the attribute of the first identification signal instruction is automatic identification, the step S232 further includes:

[0063] S2321": obtaining a value of the calibration quantity assigned by the user and assigning the calibration quantity as 2 / N+1;

[0064] S2322": the system enters an automatic identification state;

[0065] S2323'': Set a timer, and perform electrical fault diagnosis;

[0066] S2324'': If there is an electrical fault in the system, jump to the intermediate state SCR_stSysVrnt & SCR_stSysVrntEEPChc = FF, and end the process;

[0067] S2325'': If the system meets the electrical conditions, the ECU sends a request for full identification message to the metering injection pump interface.

[0068] Specifically, in the scenario where the pump type is not clear, the user assigns the SCR_stEnaPmpTyp_C calibration quantity to (2 / N+1), the system identifies the special value, and enters the automatic identification state. The specific steps are as follows:

[0069] After T15 is powered on, the ECU is initialized, and the software enters the automatic identification state. First, the electrical fault diagnosis state is performed, and the diagnosis content includes: 1. Identifying whether there is a pump-related fault (open circuit, short circuit, etc.); 2. Whether T15 is powered on; 3. Whether the battery voltage is normal. If there are non-compliant items, a timer is set, and if the fault still exists after the timer is cleared, jump to the intermediate state (SCR_stSysVrnt & SCR_stSysVrntEEPChc = FF), the system will not identify, and will identify again after the next power-on initialization, avoiding resource waste caused by continuous identification.

[0070] If there is no above fault, enter the system identification judgment module. The ECU sends a request message to the pump, and the pump motor feeds back the pump type information to the ECU, and the ECU identifies the information fed back by the pump, and writes the pump type into SCR_stSysVrnt & SCR_stSysVrntEEPChc. At the same time, a timer is set, if the pump does not feed back the pump information to the ECU within the timeout, stop sending the request, report the fault, and jump to the intermediate state (SCR_stSysVrnt & SCR_stSysVrntEEPChc = FF) The system will not identify, and will identify again after the next power-on initialization, avoiding resource waste caused by continuous identification. At the same time, the request message is unified, and the ECU only needs to send one message to make different types of pumps respond. In this embodiment, the automatic identification of the metering injection pump does not need to send multiple messages, and only needs one communication, that is, the pump type can be obtained according to the return signal of different pumps, and written into the calibration quantity, reducing the identification time.

[0071] S3: Obtain a first return signal;

[0072] S4: Analyze the first return signal; if the injection pump can be identified, proceed to the subsequent steps; if the injection pump cannot be identified, return to step S2;

[0073] As a preferred embodiment of the present embodiment, the step S4 further comprises:

[0074] S41: receiving the first feedback signal, identifying the information carrying the pump type;

[0075] S42: reading the information carrying the pump type, writing the pump type into the calibration quantity

[0076] S5: sending the second pairing signal to the metering injection pump interface;

[0077] As a preferred embodiment of the present embodiment, the step S5 further comprises:

[0078] S51: the ECU looks up the injection pump instruction library according to the pump type, and generates the control instruction;

[0079] S52: sending the control instruction as the second pairing signal.

[0080] S6: obtaining the second feedback signal;

[0081] S7: executing the control strategy, and running the start of the injection pump.

[0082] The foregoing description of specific exemplary embodiments of the application is presented for the purpose of illustration and description. It is not intended to be a limitation on the present application, as described in the specification. It will be apparent to one skilled in the art that various changes and modifications can be made to the specific embodiments described above without departing from the spirit and scope of the application. The exemplary embodiments are chosen and described in order to explain the principles of the application and its practical application. It will be apparent to one skilled in the art that various different embodiments of the application can be implemented and that numerous selection and changes can be made to the exemplary embodiments described above without departing from the scope of the application. The scope of the application is intended to be limited only by the claims and their equivalents.

Claims

1. A method for identifying multi-configuration metering jet pumps, characterized in that, Includes the following steps: S1: The ECU is initialized; S2: Sends a first identification signal to the metering injection pump interface for a single cycle; S3: Obtain the first return signal; S4: Analyze the first feedback signal; if the jet pump can be identified, proceed to the next step; if the jet pump cannot be identified, return to step S2. S5: Send a second pairing signal to the metering jet pump interface; S6: Obtain the second return signal; S7: Execute the control strategy and start the injection pump.

2. The method for identifying multi-configuration metering jet pumps as described in claim 1, characterized in that, Step S1 includes: S11: Power on T15; S12: Verify the circuit; S13: Perform system self-test.

3. The method for identifying multi-configuration metering jet pumps as described in claim 2, characterized in that, Step S2 includes: S21: The system obtains user instructions and determines the duration of the single cycle; S22: The system updates the metering injection pump instruction library and establishes the calibration quantity; S23: Obtain the user's assigned value to the calibration quantity, and generate a first identification signal based on the assigned value of the calibration quantity; S24: Send the first identification signal to the metering injection pump interface.

4. The multi-configuration metering jet pump identification method x as described in claim 3, characterized in that, Step S22 further includes: S221: The system checks the current version status; S222: Determine the update target based on the current version status; S223: Update a single library; S224: Repeat step S223 to iterate through the entire library and perform batch updates; S225: Define the variable SCR_stEnaPmpTyp_C as the calibration quantity; S226: Determine the range of values ​​for the calibration quantity.

5. The method for identifying multi-configuration metering jet pumps as described in claim 4, characterized in that, Step S23 further includes: S231: System command to obtain user status; S232: The system determines the attributes of the first identification signal command; S233: Send the first identification signal corresponding to the attribute; The attributes of the first identification signal command include: manual identification and automatic identification.

6. The method for identifying multi-configuration metering jet pumps as described in claim 5, characterized in that, When the attribute of the first identification signal command is manual identification, step S232 further includes: S2321': Obtain the value assigned by the user to the calibration quantity, and assign the calibration quantity a determined value; S2322': The system identifies the calibrated quantity assignment, searches the metering injection pump instruction library, and obtains the message content corresponding to the first identification signal instruction; S2323': Based on the calibrated value, identify the corresponding metering injection pump interface. If the corresponding metering injection pump interface is not connected to the metering injection pump, wait for the metering injection pump to be connected. S2324': Based on the calibrated quantity assignment and message content, send the corresponding message content to the metering injection pump interface at the corresponding location.

7. The method for identifying multi-configuration metering jet pumps as described in claim 5, characterized in that, When the attribute of the first identification signal command is automatic identification, step S232 further includes: S2321”: Obtain the value assigned by the user to the calibration quantity, and assign the calibration quantity to 2 / N+1; S2322”: The system has entered automatic identification mode; S2323”: Set a timer to perform electrical fault diagnosis; S2324”: If there is an electrical fault in the system, jump to the intermediate state SCR_stSysVrnt&SCR_stSysVrntEEPChc=FF and terminate the process; S2325”: If the system meets the electrical requirements, the ECU sends a request for full identification message to the metering injection pump interface.

8. A method for identifying multi-configuration metering jet pumps as described in claim 6 or 7, characterized in that, Step S4 further includes: S41: Receive the first feedback signal and identify the pump type information; S42: Read the information carrying the pump type and write the pump type into the calibration value.

9. The method for identifying multi-configuration metering jet pumps as described in claim 8, characterized in that, Step S5 further includes: S51: The ECU searches the injection pump instruction library according to the pump type and generates control instructions; S52: Send the control command as the second pairing signal.

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