Three-stage pressure relief protection control method based on energy balance and medium

Abstract

The invention discloses a three-stage pressure relief protection control method based on energy balance and a medium. The method comprises the following steps: calculating a basic gas path torque filtering rate according to an initial gas path torque filtering rate and a correction coefficient; multi-stage battery overcharge energy protection is divided; calculating an additional generation power integral, and further judging the level of the current battery overcharge energy protection; and determining a corresponding control strategy according to the current level of battery overcharge energy protection. According to the invention, through a scene-based graded electromechanical collaborative protection strategy, the risk of battery overcharge is avoided, and the application of canceling a pressure release valve in carrying a hybrid vehicle model is ensured.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and more specifically, to a three-stage pressure relief protection control method and medium based on energy trade-offs. Background Technology

[0002] Turbocharged engines have greater power output and higher fuel efficiency than naturally aspirated engines of the same displacement. However, if the high-pressure gas is not released in time during deceleration, turbocharged engines are prone to compressor surge, which can lead to a decrease in engine performance and even damage the engine. Therefore, turbocharged engines are usually equipped with a pressure relief valve to control the pressure.

[0003] Adding a pressure relief valve increases costs, and the valve generates significant noise during operation, affecting the vehicle's NVH performance.

[0004] Currently, a three-stage pressure relief protection control method based on energy trade-offs still needs to be developed.

[0005] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] This invention proposes a three-level pressure relief protection control method and medium based on energy trade-offs. It can avoid the risk of battery overcharging through a scenario-based hierarchical electromechanical collaborative protection strategy, and ensure the application of eliminating the pressure relief valve in hybrid vehicles.

[0007] In a first aspect, embodiments of this disclosure provide a three-stage pressure relief protection control method based on energy trade-offs, including:

[0008] Calculate the basic air path torque filtering rate based on the initial air path torque filtering rate and the correction coefficient;

[0009] Multi-level battery overcharge energy protection;

[0010] Calculate the integral of the additional power generation to determine the current level of battery overcharge protection;

[0011] Determine the corresponding control strategy based on the current level of battery overcharge energy protection.

[0012] Preferably, the correction coefficients include engine speed filtering correction coefficients, engine torque filtering correction coefficients, altitude filtering correction coefficients, and ambient temperature filtering correction coefficients.

[0013] Preferably, calculating the integral of additional generated power includes:

[0014] Subtract the requested air path torque before the pressure relief protection from the requested air path torque after the pressure relief protection to obtain the torque difference;

[0015] The additional power generation integral is obtained by multiplying the torque difference by the engine speed.

[0016] Preferably, determining the current battery overcharge energy protection level as Level 1 includes:

[0017] If the battery charging power is greater than the first charging power calibration threshold and less than the second charging power calibration threshold, and the additional power generation integral is greater than the power calibration threshold of the gas path torque correction, then the current battery overcharge energy protection level is Level 1.

[0018] Preferably, when the current battery overcharge energy protection level is Level 1, the corresponding control strategy includes:

[0019] Based on the engine speed and the integral of the additional power generation, the energy correction coefficient for the air path torque filter is obtained by looking up a table, and the basic air path torque filter rate is corrected.

[0020] Preferably, determining that the current battery overcharge energy protection level is level two includes:

[0021] If the battery charging power is less than the third charging power calibration threshold, and the additional power generation integral is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level two.

[0022] Preferably, when the current battery overcharge energy protection level is level two, the corresponding control strategy includes:

[0023] Activate EMS fire circuit torque intervention.

[0024] Preferably, determining the current battery overcharge energy protection level as Level 3 includes:

[0025] If the battery charging power is less than the fourth charging power calibration threshold, and the integral of the additional power generation is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level three.

[0026] Preferably, when the current battery overcharge energy protection level is level three, the corresponding control strategy includes:

[0027] Activate EMS cylinder cut-off request.

[0028] Secondly, embodiments of this disclosure also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned three-level pressure relief protection control method based on energy trade-offs.

[0029] Its beneficial effects are as follows:

[0030] Based on the engine operating conditions and characteristics of hybrid vehicles, this invention studies an electromechanical coordination strategy. When the PDCU detects that the engine has entered the depressurization condition, it reduces the engine's air circuit torque output to reduce the generation of compressed air. At the same time, it avoids battery overcharging based on energy balance, eliminating the need to open the depressurization valve for depressurization, thereby achieving the technical control of eliminating the depressurization valve.

[0031] The methods and apparatus of the present invention have other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0033] Figure 1 A flowchart illustrating the steps of a three-stage pressure relief protection control method based on energy trade-offs according to an embodiment of the present invention is shown.

[0034] Figure 2 A simplified diagram of the control algorithm interaction according to an embodiment of the present invention is shown.

[0035] Figure 3 A simplified diagram for calculating the basic air path torque filtering rate according to an embodiment of the present invention is shown.

[0036] Figure 4 A simplified diagram of first-stage battery overcharge energy protection according to an embodiment of the present invention is shown.

[0037] Figure 5 A simplified diagram of second-stage battery overcharge energy protection according to an embodiment of the present invention is shown.

[0038] Figure 6 A simplified diagram of third-level battery overcharge energy protection according to an embodiment of the present invention is shown. Detailed Implementation

[0039] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0040] To facilitate understanding of the solutions and effects of the embodiments of the present invention, two specific application examples are given below. Those skilled in the art should understand that these examples are merely for the purpose of understanding the present invention, and any specific details therein are not intended to limit the present invention in any way.

[0041] Example 1

[0042] Figure 1 A flowchart illustrating the steps of a three-stage pressure relief protection control method based on energy trade-offs according to an embodiment of the present invention is shown.

[0043] like Figure 1 As shown, this three-stage pressure relief protection control method based on energy trade-offs includes:

[0044] Step 101: Calculate the basic air path torque filtering rate based on the initial air path torque filtering rate and the correction coefficient.

[0045] Step 102: Divide the battery overcharge energy protection into multiple levels;

[0046] Step 103: Calculate the integral of the additional power generation to determine the current level of battery overcharge energy protection;

[0047] Step 104: Determine the corresponding control strategy based on the current level of battery overcharge energy protection.

[0048] In one example, the correction factors include engine speed filter correction factor, engine torque filter correction factor, altitude filter correction factor, and ambient temperature filter correction factor.

[0049] In one example, calculating the integral of additional generated power includes:

[0050] Subtract the requested air path torque before the pressure relief protection from the requested air path torque after the pressure relief protection to obtain the torque difference;

[0051] Multiplying the torque difference by the engine speed yields the integral of the additional power generation.

[0052] In one example, determining whether the current battery overcharge protection level is Level 1 includes:

[0053] If the battery charging power is greater than the first charging power calibration threshold and less than the second charging power calibration threshold, and the additional power generation integral is greater than the power calibration threshold of the air path torque correction, then the current battery overcharge energy protection level is Level 1.

[0054] In one example, when the current battery overcharge protection level is Level 1, the corresponding control strategy includes:

[0055] Based on the integral of engine speed and additional power generation, the energy correction coefficient for air path torque filtering is obtained by looking up a table, and the basic air path torque filtering rate is corrected.

[0056] In one example, determining that the current battery overcharge protection level is level two includes:

[0057] If the battery charging power is less than the third charging power calibration threshold, and the integral of the additional power generation is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level two.

[0058] In one example, when the current battery overcharge protection level is level two, the corresponding control strategy includes:

[0059] Activate EMS fire circuit torque intervention.

[0060] In one example, determining the current battery overcharge protection level as Level 3 includes:

[0061] If the battery charging power is less than the fourth charging power calibration threshold and the additional power generation integral is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level three.

[0062] In one example, when the current battery overcharge protection level is level three, the corresponding control strategy includes:

[0063] Activate EMS cylinder cut-off request.

[0064] Figure 2 A simplified diagram of the control algorithm interaction according to an embodiment of the present invention is shown.

[0065] Specifically, the overall implementation logic of this solution is as follows: Figure 2 As shown, it mainly consists of three parts: a pressure relief condition identification module, a multi-dimensional optimization torque filtering processing module for calculating the torque filtering rate of the pressure relief protection gas path request, and an energy balance decision module for balancing the additional power generation and power charging power limit during the pressure relief protection period.

[0066] When the engine pressure relief protection is activated, the engine's airflow requested torque is filtered according to the modified airflow torque filtering rate.

[0067] Figure 3 A simplified diagram for calculating the basic air path torque filtering rate according to an embodiment of the present invention is shown.

[0068] like Figure 3As shown, the multidimensional optimization torque filtering obtains the basic filtering rate based on the pressure ratio and intake volume flow rate by looking up a table, and then obtains the basic air path torque filtering rate before the charging power is limited by comprehensive correction of engine speed, engine torque, altitude correction coefficient, ambient temperature, etc.

[0069] Figure 4 A simplified diagram of first-stage battery overcharge energy protection according to an embodiment of the present invention is shown.

[0070] When the battery charging power is slightly limited, the first stage of battery overcharge energy protection is implemented. The requested torque from the engine's air intake is appropriately amplified using a correction factor. Figure 4 As shown, when the battery charging power is within the calibrated limited range and the additional power generation exceeds the calibration threshold of the air path torque correction, the correction of the basic air path torque filtering rate is activated.

[0071] The air path torque filtering correction coefficient is obtained by looking up the table based on the engine speed and the additional power generation. The difference in the requested air path torque before and after the pressure relief protection is reduced, thereby reducing the additional power generation caused by the pressure relief protection.

[0072] The correction factor should be no less than 1, but should not be set too large. It is sufficient to appropriately release the anti-surge safety margin reserved in the basic gas path torque filter rate calibration setting. Furthermore, the larger the additional power generation integral, the larger the gas path torque filter energy correction factor.

[0073] During the first-level battery overcharge protection period, the torque of the EMS's electrical circuit is required to be consistent with the torque of the EMS's pneumatic circuit, and the EMS cylinder tripping is not requested.

[0074] Figure 5 A simplified diagram of second-stage battery overcharge energy protection according to an embodiment of the present invention is shown.

[0075] When battery charging power is further limited, the engine torque output is reduced by requesting EMS (Electronic Power Supply) intervention, such as... Figure 5 As shown, when the battery charging power is lower than the calibrated threshold 3 and the additional power generation integral exceeds the fire circuit torque intervention calibrated threshold, the EMS fire circuit torque intervention is activated.

[0076] During the second-stage battery overcharge energy protection period, the pressure relief protection requests the EMS's gas path torque to be filtered and output normally according to the basic gas path torque filtering rate. The EMS's fire path torque is requested to gradually approach the EMS's fire path torque before the pressure relief protection request based on the increase of the additional power generation integral value, without requesting EMS cylinder tripping.

[0077] Figure 6 A simplified diagram of third-level battery overcharge energy protection according to an embodiment of the present invention is shown.

[0078] When battery charging power is severely limited, the engine torque output can be further reduced by requesting EMS cylinder deactivation. For example... Figure 6 As shown, when the battery charging power is lower than the calibrated threshold 4 and the additional power generation exceeds the cylinder cut-off request calibrated threshold, the EMS cylinder cut-off request is activated.

[0079] During the third-level battery overcharge energy protection period, the pressure relief protection requests the EMS air circuit torque to be filtered and output normally according to the basic air circuit torque filtering rate, and requests the EMS fire circuit torque to be executed according to the EMS cylinder cut-off torque.

[0080] Based on the above control strategy, it can be ensured that the pressurized gas is depressurized without surge under various operating conditions during the depressurization protection activation process, and there is no risk of battery overcharging, thereby reducing the overall vehicle procurement cost and improving NVH performance.

[0081] As a component of the turbocharging system, eliminating the pressure relief valve can reduce the additional costs associated with its procurement and installation. Reducing the use of pressure relief valves also lowers resource consumption and waste generation during manufacturing, thus having a positive environmental impact. Furthermore, it eliminates venting noise, improving the overall NVH (noise, vibration, and harshness) quality of the vehicle.

[0082] Example 2

[0083] This disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the energy-trade-based three-level pressure relief protection control method.

[0084] A computer-readable storage medium according to embodiments of the present disclosure stores non-transitory computer-readable instructions. When these non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the methods described in the foregoing embodiments of the present disclosure are performed.

[0085] The aforementioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or portable hard drive), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0086] Those skilled in the art should understand that the above description of the embodiments of the present invention is only intended to illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.

[0087] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A three-stage pressure relief protection control method based on energy trade-offs, characterized in that, include: Calculate the basic air path torque filtering rate based on the initial air path torque filtering rate and the correction coefficient; Divide the battery overcharge energy protection into multiple levels; Calculate the integral of the additional power generation to determine the current level of battery overcharge protection; Determine the corresponding control strategy based on the current level of battery overcharge energy protection.

2. The three-stage pressure relief protection control method based on energy trade-off as described in claim 1, wherein, The correction coefficients include engine speed filter correction coefficient, engine torque filter correction coefficient, altitude filter correction coefficient, and ambient temperature filter correction coefficient.

3. The three-stage pressure relief protection control method based on energy trade-off as described in claim 1, wherein, The calculation of the additional power generation integral includes: Subtract the requested air path torque before the pressure relief protection from the requested air path torque after the pressure relief protection to obtain the torque difference; The additional power generation integral is obtained by multiplying the torque difference by the engine speed.

4. The three-stage pressure relief protection control method based on energy trade-off as described in claim 1, wherein, Determining the current battery overcharge protection level as Level 1 includes: If the battery charging power is greater than the first charging power calibration threshold and less than the second charging power calibration threshold, and the additional power generation integral is greater than the power calibration threshold of the gas path torque correction, then the current battery overcharge energy protection level is Level 1.

5. The three-stage pressure relief protection control method based on energy trade-off as described in claim 4, wherein, When the current battery overcharge energy protection level is Level 1, the corresponding control strategies include: Based on the engine speed and the integral of the additional power generation, the energy correction coefficient for the air path torque filter is obtained by looking up a table, and the basic air path torque filter rate is corrected.

6. The three-stage pressure relief protection control method based on energy trade-off as described in claim 1, wherein, Determining the current battery overcharge protection level as Level 2 includes: If the battery charging power is less than the third charging power calibration threshold, and the additional power generation integral is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level two.

7. The three-stage pressure relief protection control method based on energy trade-off as described in claim 6, wherein, When the current battery overcharge energy protection level is level two, the corresponding control strategies include: Activate EMS fire circuit torque intervention.

8. The three-stage pressure relief protection control method based on energy trade-off as described in claim 1, wherein, Determining the current battery overcharge protection level as Level 3 includes: If the battery charging power is less than the fourth charging power calibration threshold, and the integral of the additional power generation is greater than the power calibration threshold activated by the fire circuit torque intervention, then the current battery overcharge energy protection level is level three.

9. The three-stage pressure relief protection control method based on energy trade-off as described in claim 8, wherein, When the current battery overcharge energy protection level is level three, the corresponding control strategies include: Activate EMS cylinder cut-off request.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the three-stage pressure relief protection control method based on energy trade-offs as described in any one of claims 1-9.

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