A supercharger protection control method, system, diesel engine and equipment

Abstract

The present application belongs to the technical field of diesel engine supercharger protection, and provides a supercharger protection control method, system, diesel engine and equipment, which performs calculation of the protection oil quantity of the compressor of the high-pressure stage supercharger, performs calculation of the protection oil quantity of the compressor of the low-pressure stage supercharger, compares the two calculation results, and determines the minimum value in the two results as the protection oil quantity limit value of the two-stage supercharger. The present application is applicable to two-stage supercharged objects, separately calculates the protection oil quantity limit values of the two-stage superchargers, and matches the inter-stage intercooler efficiency and the compressor efficiency of the engine body, so that the risk point can be accurately identified and protection can be completed.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine turbocharger protection technology, and relates to a turbocharger protection control method, system, diesel engine and equipment. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Heavy-duty products such as cranes operate in high-power areas on roads, and the high exhaust energy is transferred to the turbocharger compressor, resulting in high intake air temperature and pressure after the compressor. The problem of high intake pressure / temperature caused by the double utilization of exhaust energy in two-stage turbocharged diesel engines is particularly prominent.

[0004] In addition, due to the overall layout of the crane, the engine compartment is relatively sealed with poor air circulation. The high temperature inside the compartment leads to high engine intake temperature and high intake temperature after the compressor, resulting in reliability issues with the turbocharger.

[0005] According to the inventor, current solutions to the aforementioned problems mostly rely on the measured values ​​of the intake air temperature sensor at the diesel engine's intake manifold. When the temperature exceeds a limit, the fuel injection quantity is adjusted to mitigate the risk. However, due to space constraints and variations in intercooler models, the cooling capacity of intercoolers varies significantly. In practical applications, the measured intake air temperature at the intake manifold after the intercooler cannot accurately calculate the air temperature after the turbocharger compressor, making it impossible to accurately identify risk points and implement protection. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a turbocharger protection control method, system, diesel engine, and equipment applicable to two-stage turbocharged systems. It calculates the protection oil quantity limits for each stage of the turbocharger and matches the intercooler efficiency and compressor efficiency of the engine body. By considering and correcting various factors, it can accurately identify risk points and complete protection.

[0007] According to some embodiments, the present invention adopts the following technical solution:

[0008] A turbocharger protection control method includes the following steps:

[0009] Calculate the compressor protection oil quantity for the high-pressure stage turbocharger;

[0010] Calculate the compressor protection oil quantity for the low-pressure stage turbocharger;

[0011] Compare the two calculation results and determine the minimum value between them as the protection oil limit value for the two-stage turbocharger.

[0012] As an alternative implementation method, the specific process for calculating the compressor protection oil quantity of the high-pressure stage turbocharger includes:

[0013] Based on rotational speed and circulating oil volume, determine the reference value for temperature after interstage cooling;

[0014] Taking into account the effects of water temperature deviation and intake air flow deviation, the final interstage temperature limit after intercooling is determined.

[0015] When the temperature measurement value after intercooling in the stage is higher than the limit value, the oil quantity is limited. Combined with the external characteristic oil quantity limit, the compressor protection oil quantity value of the high-pressure stage turbocharger is determined.

[0016] As a further limitation, the specific process of determining the reference temperature value after interstage intercooling based on engine speed and circulating oil volume includes finding the interstage intercooling limit MAP according to engine speed and circulating oil volume, and determining the interstage intercooling temperature reference value.

[0017] As a further limitation, the specific process, taking into account the effects of water temperature deviation and air intake flow deviation, includes calculating the water temperature deviation correction coefficient based on the measured value of the outlet water temperature and the preset reference value.

[0018] Based on the rotational speed and circulating oil volume, locate the baseline MAP for intake air flow, calculate the deviation between the baseline MAP and the measured intake air flow, and determine the flow deviation correction factor.

[0019] As a further constraint, the interstage intercooler post-limit value MAP is multiplied by the water temperature deviation correction factor and the flow rate deviation correction factor to obtain the final interstage intercooler post-temperature limit value.

[0020] As a further limitation, the specific process for determining the compressor protection oil quantity value of the high-pressure stage turbocharger, in conjunction with the external characteristic oil quantity limit, includes: if the measured temperature after intercooling is higher than the final intercooling temperature limit, the oil quantity MAP based on speed and temperature limit is found and compared with the external characteristic oil quantity limit, and the smaller value of the two is taken as the compressor protection oil quantity value of the high-pressure stage turbocharger.

[0021] As an alternative implementation, the specific process of calculating the compressor protection oil quantity of the low-pressure stage turbocharger includes: the measured temperature value after intercooling is determined by adding a water temperature deviation correction coefficient and an intercooling efficiency attenuation coefficient to the intercooler reference efficiency, and then calculating and determining the current intercooling temperature model value before intercooling.

[0022] The compressor protection oil quantity value of the low-pressure stage turbocharger is calculated by combining the current interstage pre-cooling temperature model value with the pre-calibrated correction coefficient and external characteristic oil quantity limit.

[0023] As a further limitation, the intercooler reference efficiency and the water temperature deviation correction coefficient are multiplied together, and then multiplied together with the cooling efficiency attenuation coefficient before intercooling to obtain the influencing factor calculation result. The temperature measurement value after intercooling and the influencing factor calculation result are multiplied together to obtain the current intercooling temperature model value before intercooling.

[0024] As a further limitation, the current interstage pre-cooling temperature model value is corrected based on a pre-calibrated interstage pre-cooling temperature correction coefficient, and then multiplied by the external characteristic oil quantity limit to obtain the compressor protection oil quantity value of the low-pressure stage turbocharger.

[0025] A turbocharger protection control system, comprising:

[0026] The first calculation module is configured to calculate the compressor protection oil quantity of the high-pressure stage turbocharger.

[0027] The second calculation module is configured to calculate the compressor protection oil quantity of the low-pressure stage turbocharger.

[0028] The comparison module is configured to compare two calculation results and determine the minimum value between them as the protection oil limit value for the two-stage turbocharger.

[0029] A two-stage turbocharged diesel engine includes a high-pressure stage turbocharger and a low-pressure stage turbocharger, the two turbochargers are arranged in series, a cooler is arranged between the compressors of the two turbochargers to cool the intake air after the low-pressure stage, and the turbocharger protection and control method described above is adopted, or the turbocharger protection and control system described above is included.

[0030] An apparatus comprising a two-stage turbocharged diesel engine, wherein the two-stage turbocharged diesel engine employs the aforementioned turbocharger protection control method, or comprises the aforementioned turbocharger protection control system.

[0031] Equipment includes, but is not limited to, cranes.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] This invention can calculate the protection oil limit for the two-stage turbocharger separately. By taking into account and correcting factors such as the measured temperature after intercooling and the intercooler and high-pressure turbocharger of the diesel engine, as well as the efficiency of the intercooler and the compressor, it can more accurately identify risk points and complete protection.

[0034] This invention considers the effects of rotational speed and cyclic fuel injection quantity when calculating the compressor protection oil quantity of the high-pressure stage turbocharger, and makes corrections based on water temperature deviation and intake air flow deviation. Under certain constraints, the compressor protection oil quantity of the high-pressure stage turbocharger is calculated, ensuring that it is suitable for actual application scenarios. It integrates multiple influencing factors and ensures the accuracy of the results.

[0035] When calculating the compressor protection oil quantity of the low-pressure stage turbocharger, this invention considers the effects of interstage intercooler cooling efficiency, water temperature deviation, and cooling efficiency decay, as well as the external characteristic oil quantity limit, thus ensuring the accuracy of the results.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1 This is a schematic diagram of a two-stage turbocharged diesel engine structure in one embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the oil quantity limiting process for the two-stage turbocharger protection in one embodiment of the present invention. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Example 1

[0044] like Figure 1 As shown, the solution provided in this embodiment is applicable to two-stage turbochargers. The following explanation uses a two-stage turbocharged diesel engine as an example.

[0045] The main difference between a two-stage turbocharged diesel engine and a single-stage turbocharged diesel engine lies in the intake system. The two-stage turbochargers in series further pressurize the air to improve the charging efficiency. To avoid the intake air temperature rising after the low-pressure stage compressor and affecting the charging efficiency, a cooler is arranged between the two-stage compressors to cool the intake air after the low-pressure stage.

[0046] Specifically, such as Figure 2 As shown, the compressor protection oil quantity is calculated for the high-pressure and low-pressure stages of the two-stage turbocharged diesel engine, and the minimum value between the two is determined as the protection oil quantity limit for the two-stage turbocharger. This is used to ensure the reliability of the turbocharger in certain extreme application scenarios of the vehicle.

[0047] For the high-pressure stage turbocharger, based on the speed and circulating oil volume, the interstage after-intercooling limit MAP is found to determine the interstage after-intercooling temperature reference value. On this basis, the final interstage after-intercooling temperature limit is determined by correcting with water temperature deviation correction coefficient and intake air flow deviation correction coefficient.

[0048] The process of correcting the deviation through water temperature and air flow includes: calculating the water temperature deviation correction coefficient based on the measured water temperature and the preset reference value.

[0049] Based on the rotational speed and circulating oil volume, locate the baseline MAP for intake air flow, calculate the deviation between the baseline MAP and the measured intake air flow, and determine the flow deviation correction factor.

[0050] The final interstage temperature limit after intercooling is obtained by multiplying the MAP value after intercooling by the correction factors based on water temperature deviation and flow rate deviation.

[0051] If the measured value of the temperature sensor is higher than the limit, oil quantity limitation is required. Based on the speed and the measured temperature after interstage cooling, the oil quantity limit is determined by referring to the MAP. The oil quantity limit is compared with the external characteristic oil quantity limit, and the smaller value is taken as the protection oil quantity value for the high-pressure stage compressor.

[0052] like Figure 2 As shown, for the calculation of the protection oil quantity of the low-pressure stage compressor, the measured temperature after the interstage intercooler is determined by adding a water temperature deviation correction coefficient and an interstage intercooler pre-cooling efficiency attenuation coefficient to the interstage intercooler reference efficiency, and then correcting the calculation to determine the current interstage intercooler pre-cooler temperature model value.

[0053] The interstage intercooler reference efficiency is multiplied by the water temperature deviation correction coefficient, and then multiplied by the interstage intercooler pre-cooling efficiency attenuation coefficient to obtain the influencing factor calculation result. The interstage intercooler post-cooling temperature measurement value is multiplied by the influencing factor calculation result to obtain the current interstage intercooler pre-cooling temperature model value.

[0054] The interstage pre-cooling model temperature is calculated and determined as the low-pressure stage compressor protection oil quantity value based on the pre-calibrated correction coefficient and the external characteristic oil quantity limit.

[0055] In this embodiment, the current interstage pre-cooling temperature model value is corrected based on a pre-calibrated interstage pre-cooling temperature correction coefficient, and then multiplied by the external characteristic oil quantity limit to obtain the compressor protection oil quantity value of the low-pressure stage turbocharger.

[0056] The pre-calibrated correction coefficients can be obtained through methods such as bench testing.

[0057] The scheme in this embodiment calculates the protection oil limit for the two-stage turbocharger separately, and matches the engine body with the intercooler efficiency model and the compressor efficiency model, which can more accurately identify risk points and complete the protection.

[0058] Example 2

[0059] A turbocharger protection control system, comprising:

[0060] The first calculation module is configured to calculate the compressor protection oil quantity of the high-pressure stage turbocharger.

[0061] The second calculation module is configured to calculate the compressor protection oil quantity of the low-pressure stage turbocharger.

[0062] The comparison module is configured to compare two calculation results and determine the minimum value between them as the protection oil limit value for the two-stage turbocharger.

[0063] Example 3

[0064] A two-stage turbocharged diesel engine includes a high-pressure stage turbocharger and a low-pressure stage turbocharger, which are arranged in series. A cooler is arranged between the compressors of the two stages to cool the intake air after the low-pressure stage. The turbocharger protection control method in Embodiment 1 is used, or the turbocharger protection control system in Embodiment 2 is included.

[0065] Example 4

[0066] A crane includes a two-stage turbocharged diesel engine, wherein the two-stage turbocharged diesel engine employs the turbocharger protection control method of Embodiment 1, or includes the turbocharger protection control system of Embodiment 2.

[0067] Of course, the solution of this invention can also be applied to other heavy-duty equipment that employs a two-stage turbocharged diesel engine. These will not be listed exhaustively here.

[0068] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0069] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0070] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0071] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0073] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A turbocharger protection control method, characterized in that, Includes the following steps: Calculate the compressor protection oil quantity for the high-pressure stage turbocharger; The specific process for calculating the compressor protection oil quantity of the high-pressure stage turbocharger includes: Based on rotational speed and circulating oil volume, determine the reference value for temperature after interstage cooling; Taking into account the effects of water temperature deviation and intake air flow deviation, the final interstage temperature limit after intercooling is determined. When the temperature measurement value after interstage cooling is higher than the limit, the oil quantity is limited. Combined with the external characteristic oil quantity limit, the compressor protection oil quantity value of the high-pressure stage turbocharger is determined. Calculate the compressor protection oil quantity for the low-pressure stage turbocharger; The specific process for calculating the compressor protection oil quantity of the low-pressure stage turbocharger includes: the measured temperature value after intercooling is determined by adding a water temperature deviation correction coefficient and an intercooling efficiency attenuation coefficient to the intercooler's reference efficiency, and then calculating and determining the current intercooling temperature model value before intercooling. The compressor protection oil quantity value of the low-pressure stage turbocharger is calculated by combining the current interstage pre-cooling temperature model value with the pre-calibrated correction coefficient and external characteristic oil quantity limit. Compare the two calculation results and determine the minimum value between them as the protection oil limit value for the two-stage turbocharger.

2. The turbocharger protection control method as described in claim 1, characterized in that, The specific process of determining the reference temperature value after interstage intercooling based on engine speed and circulating oil volume includes finding the interstage intercooling limit MAP according to engine speed and circulating oil volume, and determining the reference temperature value after interstage intercooling.

3. The turbocharger protection control method as described in claim 1, characterized in that, The specific process, which takes into account the effects of water temperature deviation and air flow deviation, includes calculating the water temperature deviation correction coefficient based on the measured value of the outlet water temperature and the preset reference value. Based on the rotational speed and circulating oil volume, locate the baseline MAP for intake air flow, calculate the deviation between the baseline MAP and the measured intake air flow, and determine the flow deviation correction factor.

4. A turbocharger protection control method as described in claim 1 or 3, characterized in that, The final interstage temperature limit after intercooling is obtained by multiplying the MAP value after intercooling by the correction factors based on water temperature deviation and flow rate deviation.

5. The turbocharger protection control method as described in claim 1, characterized in that, The specific process for determining the compressor protection oil quantity value of the high-pressure stage turbocharger by combining the external characteristic oil quantity limit includes: if the measured temperature value after intercooling between stages is higher than the final temperature limit after intercooling between stages, the oil quantity MAP based on speed and temperature limit is found and compared with the external characteristic oil quantity limit. The smaller value of the two is taken as the compressor protection oil quantity value of the high-pressure stage turbocharger.

6. The turbocharger protection control method as described in claim 1, characterized in that, The intercooler reference efficiency and the water temperature deviation correction coefficient are multiplied together, and then multiplied by the intercooler pre-cooling efficiency attenuation coefficient to obtain the influencing factor calculation result. The intercooler post-cooling temperature measurement value and the influencing factor calculation result are multiplied together to obtain the current intercooler pre-cooling temperature model value.

7. The turbocharger protection control method as described in claim 1, characterized in that, The current interstage pre-cooling temperature model value is corrected by a pre-calibrated interstage pre-cooling temperature correction coefficient and then multiplied by the external characteristic oil quantity limit to obtain the compressor protection oil quantity value of the low-pressure stage turbocharger.

8. A turbocharger protection control system, characterized in that, include: The first calculation module is configured to calculate the compressor protection oil quantity of the high-pressure stage turbocharger. The first computing module includes: The reference value determination module is configured to determine the reference value of the interstage intercooler temperature based on the rotational speed and the circulating oil volume. The correction module is configured to determine the final interstage temperature limit after the intercooler by taking into account both the effects of water temperature deviation and intake airflow deviation. The limiting module is configured to limit the oil quantity when the measured temperature after interstage cooling is higher than the limit value, and to determine the compressor protection oil quantity value of the high-pressure stage turbocharger in combination with the external characteristic oil quantity limit. The second calculation module is configured to calculate the compressor protection oil quantity of the low-pressure stage turbocharger. The second computing module includes: The correction module is configured to correct and calculate the current interstage intercooler pre-cooling temperature model value by adding a water temperature deviation correction coefficient and an interstage intercooler pre-cooling efficiency attenuation coefficient to the interstage intercooler reference efficiency. The limiting module is configured to combine the current interstage pre-cooling temperature model value with a pre-calibrated correction coefficient and external characteristic oil quantity limit to calculate the compressor protection oil quantity value of the low-pressure stage turbocharger. The comparison module is configured to compare two calculation results and determine the minimum value between them as the protection oil limit value for the two-stage turbocharger.

9. A two-stage turbocharged diesel engine, characterized in that, It includes a high-pressure stage turbocharger and a low-pressure stage turbocharger, which are arranged in series. A cooler is arranged between the compressors of the two stages turbochargers to cool the intake air after the low-pressure stage. It adopts the turbocharger protection and control method according to any one of claims 1-7, or includes the turbocharger protection and control system as described in claim 8.

10. A device comprising a diesel engine, characterized in that, The invention includes a two-stage turbocharged diesel engine, wherein the two-stage turbocharged diesel engine employs the turbocharger protection control method described in any one of claims 1-7, or includes the turbocharger protection control system described in claim 8.

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