A method for correcting the fuel injection amount of an oil injector

Abstract

The present application provides a kind of oil injector oil injection quantity correction method, comprising the following steps: the real value of the oil injector oil injection quantity of oil injector under test energizing time and test fuel injection pressure is measured using electronic service tool;Electronic service tool transmits the real value of the measured oil injector oil injection quantity to the electronic control module of engine, and compares with the reference value of the oil injector oil injection quantity stored in electronic control module under corresponding test energizing time and test fuel injection pressure;If the real value of the measured oil injector oil injection quantity and the reference value of the stored oil injector oil injection quantity exist difference, then electronic service tool sends the instruction of updating oil quantity formula to electronic control module;Electronic control module calculates updated oil quantity formula according to instruction and saves updated oil quantity formula to electronic control module, and electronic control module drives oil injector to spray oil according to updated oil quantity formula.The present application can improve the oil injection accuracy of oil injector, and then can reduce the failure rate of oil injector, prolong the service life of oil injector.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, and specifically relates to a method for correcting the fuel injection quantity of an injector. Background Technology

[0002] Currently, the fuel injection quantity control strategy used in diesel engines is generally open-loop control. The fuel injection quantity is typically determined by the injection pressure and the injector energizing time. Open-loop control means that the relationship between fuel injection quantity, injection pressure, and injector energizing time remains constant. However, because the injection characteristics of the injector change with the accumulation of energizing time, the logic using open-loop control can lead to a continuous deterioration in fuel injection quantity accuracy. In existing technology, when a vehicle experiences certain failures related to injector fuel injection quantity accuracy, the fuel injection quantity accuracy is usually tested at a service station, but no fuel injection quantity accuracy correction is performed. This means that deviations caused by wear or blockage during use cannot be corrected, leading to an increase in injector failure rate. If the fuel injection quantity accuracy deviation reaches a certain level, the injector is considered a failed injector and replaced, thus shortening the injector's service life. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a method for correcting the fuel injection quantity of an injector.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for correcting the fuel injection quantity of an injector, comprising the following steps: measuring the actual value of the fuel injection quantity of the injector under test energizing time and test injection pressure using an electronic service tool; the electronic service tool transmitting the measured actual value of the fuel injection quantity of the injector to the engine's electronic control module and comparing it with the reference value of the fuel injection quantity of the injector under the corresponding test energizing time and test injection pressure stored in the electronic control module; if there is a difference between the measured actual value of the fuel injection quantity of the injector and the stored reference value of the fuel injection quantity of the injector, the electronic service tool sending an instruction to the electronic control module to update the fuel injection quantity formula; the electronic control module calculating the updated fuel injection quantity formula according to the instruction and saving the updated fuel injection quantity formula to the electronic control module; and the electronic control module driving the injector to inject fuel according to the updated fuel injection quantity formula.

[0005] In one specific embodiment, the updated oil quantity formula is:

[0006] Q′=C1′T+C2′P+C3′PT+C4′ Formula (1)

[0007] Where T is the energizing time of the injector; P is the injection pressure of the injector; Q′ is the updated injection quantity of the injector under the corresponding energizing time and injection pressure; C1′, C2′, C3′ and C4′ are the corresponding updated fuel quantity coefficients.

[0008] In one specific embodiment, multiple detection points of the injector are selected, and the updated fuel quantity formula is fitted based on the test energizing time, test injection pressure and corresponding injection quantity of the multiple detection points.

[0009] In one specific embodiment, the plurality of detection points include a first measuring point and a second measuring point. Based on the test energizing time, test injection pressure, and corresponding injection quantity of the first measuring point of the injector, and the test energizing time, test injection pressure, and corresponding injection quantity of the second measuring point, multiple solutions to the fuel quantity formula of the injector are determined:

[0010] Q1=f(T1,P1) Formula (2)

[0011] Q2=f(T2,P2) Formula (3)

[0012] Wherein, T1 is the test power-on time of the first measuring point; P1 is the test injection pressure of the first measuring point; Q1 is the corresponding injection quantity of the first measuring point; T2 is the test power-on time of the second measuring point; P2 is the test injection pressure of the second measuring point; and Q2 is the corresponding injection quantity of the second measuring point.

[0013] In one specific embodiment, the multiple solutions of the fuel quantity formula of the injector are fitted by the least squares method to obtain the updated fuel quantity formula.

[0014] In one specific embodiment, the reference value of the injector injection quantity under the corresponding test energizing time and the test injection pressure is obtained according to the initial fuel quantity formula of the injector injection quantity stored in the electronic control module.

[0015] In one specific embodiment, the initial fuel quantity formula for the injector's fuel injection quantity stored in the electronic control module is:

[0016] Q = C1T + C2P + C3PT + C4 (Formula 4)

[0017] Wherein, T is the energizing time of the injector; P is the injection pressure of the injector; Q is the initial injection quantity of the injector under the corresponding energizing time and injection pressure; C1, C2, C3 and C4 are the corresponding initial fuel quantity coefficients.

[0018] In one specific embodiment, the electronic service tool includes: at least one processor; and a memory connected to the processor; wherein the memory stores calculation program instructions executable by the processor, which, when executed by the processor, cause the processor to perform a corresponding task to measure the true value of the fuel injection quantity of the injector.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The injector injection quantity correction method of the present invention utilizes an updated fuel quantity formula to correct the deviation caused by wear or blockage of the injector during use, thereby improving the injection accuracy of the injector and achieving closed-loop correction. This reduces the injector failure rate, extends the service life of the injector, and improves the engine's power and fuel economy. Attached Figure Description

[0021] Figure 1 A flowchart illustrating a specific embodiment of the injector injection quantity correction method of the present invention is shown.

[0022] Figure 2 A graph showing the updated fuel quantity formula and the initial fuel quantity formula of a specific embodiment of the fuel injector injection quantity correction method of the present invention is provided. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0024] like Figure 1 As shown, the method for correcting the fuel injection quantity of the injector according to the present invention includes the following steps:

[0025] (1) Measure the actual value of the injector's fuel injection quantity under test energizing time and test injection pressure using electronic service tools. For example, after a vehicle enters the service station, the actual value of the injector's fuel injection quantity is detected using electronic service tools. These tools allow for real-time detection of the injector's fuel injection quantity with high accuracy and reliability.

[0026] (2) The electronic service tool transmits the measured true value of the injector injection quantity to the engine's electronic control module and compares it with the reference value of the injector injection quantity stored in the electronic control module under the corresponding test power-on time and test injection pressure. By comparing the true value of the injector injection quantity with the corresponding reference value, it is easy to determine whether there is a deviation between the true value of the injector injection quantity and the corresponding reference value.

[0027] (3) If there is a difference between the measured actual value of the injector injection quantity and the stored reference value of the injector injection quantity, the electronic service tool sends an instruction to the electronic control module to update the fuel quantity formula. Sending the instruction to update the fuel quantity formula via the electronic service tool facilitates real-time control of the electronic control module to update the fuel quantity formula.

[0028] (4) The electronic control module calculates the updated fuel quantity formula according to the instruction and saves the updated fuel quantity formula to the electronic control module. The electronic control module then drives the injector to inject fuel according to the updated fuel quantity formula. In this way, the electronic control module can improve the fuel injection accuracy of the injector by driving the injector to inject fuel according to the updated fuel quantity formula.

[0029] This method utilizes electronic service tools to measure the actual fuel injection quantity of the injectors in real time. Based on the deviation between the actual and reference values, it sends an update command to the electronic control module (ECU) to adjust the fuel injection formula. The ECU then drives the injectors to inject fuel according to the updated formula. This corrects deviations caused by wear or blockage during use, improving injection accuracy and achieving closed-loop correction. This reduces injector failure rates, extends injector lifespan, and enhances engine power and fuel economy. This correction method compensates for the limitations of open-loop fuel injection control strategies in correcting fuel injection deviations.

[0030] In one specific embodiment, the updated oil quantity formula is:

[0031] Q′=C1′T+C2′P+C3′PT+C4′ Formula (1)

[0032] Where T is the energizing time of the injector; P is the injection pressure of the injector; Q′ is the updated injection quantity of the injector under the corresponding energizing time and injection pressure; C1′, C2′, C3′ and C4′ are the corresponding updated fuel quantity coefficients, which are determined according to the injection quantity characteristics of the injector.

[0033] The updated fuel quantity formula accurately represents the relationship between the updated fuel injection quantity, injection pressure, and energizing time of the injector. The electronic control module (ECU) drives the injector to inject fuel according to the updated formula, thus improving the injector's injection accuracy. The updated fuel quantity formula curve stored in the ECU is shown below. Figure 2 As shown.

[0034] In one specific embodiment, multiple detection points of the injector are selected, and an updated fuel quantity formula is fitted based on the test energizing time, test injection pressure, and corresponding injection quantity of the multiple detection points. By selecting multiple detection points of the injector, the accuracy of the fitted updated fuel quantity formula can be improved.

[0035] In one specific embodiment, multiple detection points include a first measuring point and a second measuring point. Based on the test energizing time, test injection pressure, and corresponding injection quantity of the first measuring point, and the test energizing time, test injection pressure, and corresponding injection quantity of the second measuring point, multiple solutions to the fuel quantity formula of the injector are determined.

[0036] Q1=f(T1,P1) Formula (2)

[0037] Q2=f(T2,P2) Formula (3)

[0038] Where T1 is the test power-on time of the first measuring point; P1 is the test injection pressure of the first measuring point; Q1 is the corresponding injection quantity of the first measuring point; T2 is the test power-on time of the second measuring point; P2 is the test injection pressure of the second measuring point; and Q2 is the corresponding injection quantity of the second measuring point.

[0039] By utilizing the test energizing time, test injection pressure, and corresponding injection quantity at the first measuring point of the injector, and the test energizing time, test injection pressure, and corresponding injection quantity at the second measuring point, two sets of solutions to the fuel quantity formula of the injector can be determined simply and efficiently, with high accuracy and good reliability.

[0040] In one specific embodiment, multiple solutions to the fuel quantity formula of the injector are fitted using the least squares method to obtain an updated fuel quantity formula. Specifically, by using multiple measured solutions of the injector and fitting them using the least squares method, the optimal linear equation can be obtained, thus yielding the updated fuel quantity formula.

[0041] In one specific embodiment, a reference value for the injector's injection quantity under the corresponding test energizing time and test injection pressure is obtained based on the initial injection quantity formula stored in the electronic control module. The initial injection quantity formula stored in the electronic control module in the open-loop injection quantity control strategy remains unchanged throughout the injector's service life.

[0042] In one specific embodiment, the initial fuel quantity formula for the injector injection quantity stored in the electronic control module is:

[0043] Q = C1T + C2P + C3PT + C4 (Formula 4)

[0044] Where T is the energizing time of the injector; P is the injection pressure of the injector; Q is the initial injection quantity of the injector under the corresponding energizing time and injection pressure; C1, C2, C3 and C4 are the corresponding initial fuel quantity coefficients, which are determined according to the injection quantity characteristics of the injector.

[0045] The initial fuel quantity formula represents the relationship between the initial fuel injection quantity, injection pressure, and energizing time of the injector, and remains constant throughout the injector's lifespan. The initial fuel quantity formula curve stored in the electronic control module is shown below. Figure 2 As shown.

[0046] In one specific embodiment, the electronic service tool includes: at least one processor; and a memory connected to the processor; wherein the memory stores calculation program instructions executable by the processor, which, when executed by the processor, cause the processor to perform a corresponding task to measure the true value of the fuel injection quantity of the injector.

[0047] When this invention is used, an electronic service tool can measure the actual value of the fuel injection quantity of the injector in real time. Based on the deviation between the actual value and the reference value of the fuel injection quantity, an instruction to update the fuel quantity formula is sent to the electronic control module. The electronic control module drives the injector to inject fuel according to the updated fuel quantity formula. This can correct the deviation caused by wear or blockage of the injector during use, thereby improving the fuel injection accuracy of the injector and achieving a closed-loop correction function. This reduces the failure rate of the injector, extends the service life of the injector, and improves the engine's power and fuel economy.

[0048] The scope of protection of this invention is not limited to the embodiments described above. Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its scope and spirit. If these modifications and variations fall within the scope of the claims of this invention and their equivalents, then the intent of this invention also includes these modifications and variations.

Claims

1. A method of correcting the injection quantity of an oil jet, characterized by, The method comprises the following steps: measuring the actual value of the fuel injection quantity of the fuel injector under the test energizing time and the test fuel injection pressure by using an electronic service tool; the electronic service tool transmits the measured actual value of the fuel injection quantity to the electronic control module of the engine and compares it with the reference value of the fuel injection quantity stored in the electronic control module under the corresponding test energizing time and test fuel injection pressure; if there is a difference between the measured actual value of the fuel injection quantity and the reference value of the fuel injection quantity stored in the electronic control module, the electronic service tool sends an instruction to update the fuel injection quantity formula to the electronic control module; the electronic control module calculates the updated fuel injection quantity formula according to the instruction and saves the updated fuel injection quantity formula to the electronic control module, and drives the fuel injector to inject fuel according to the updated fuel injection quantity formula; a plurality of detection points of the fuel injector are selected, and the updated fuel injection quantity formula is fitted according to the test energizing time, test fuel injection pressure and corresponding fuel injection quantity of the plurality of detection points; the plurality of detection points include a first detection point and a second detection point, and a plurality of solutions of the fuel injection quantity formula of the fuel injector are determined according to the test energizing time, test fuel injection pressure and corresponding fuel injection quantity of the first detection point and the test energizing time, test fuel injection pressure and corresponding fuel injection quantity of the second detection point: Q1=f(T1,P1) formula (2) Q2=f(T2,P2) formula (3) wherein T1 is the test energizing time of the first detection point, P1 is the test fuel injection pressure of the first detection point, Q1 is the corresponding fuel injection quantity of the first detection point, T2 is the test energizing time of the second detection point, P2 is the test fuel injection pressure of the second detection point, and Q2 is the corresponding fuel injection quantity of the second detection point; the plurality of solutions of the fuel injection quantity formula of the fuel injector are fitted by the least square method to obtain the updated fuel injection quantity formula; the updated fuel injection quantity formula is: Q'=C1'T+C2'P+C3'PT+C4' formula (1) wherein T is the energizing time of the fuel injector, P is the fuel injection pressure of the fuel injector, Q' is the updated fuel injection quantity of the fuel injector under the corresponding energizing time and fuel injection pressure, and C1', C2', C3' and C4' are corresponding updated fuel injection quantity coefficients; the reference value of the fuel injection quantity of the fuel injector under the corresponding test energizing time and test fuel injection pressure is obtained according to the initial fuel injection quantity formula of the fuel injection quantity stored in the electronic control module; the initial fuel injection quantity formula of the fuel injection quantity stored in the electronic control module is: Q=C1T+C2P+C3PT+C4 formula (4) wherein T is the energizing time of the fuel injector, P is the fuel injection pressure of the fuel injector, Q is the initial fuel injection quantity of the fuel injector under the corresponding energizing time and fuel injection pressure, and C1, C2, C3 and C4 are corresponding initial fuel injection quantity coefficients.

2. The fuel injection quantity correction method according to claim 1, characterized by, The electronic service tool comprises at least one processor and a memory connected to the processor, wherein the memory stores executable program instructions of a calculation value program, and the program instructions are executed by the processor to make the processor execute corresponding jobs to measure the real value of the fuel injection quantity of the fuel injector.

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