Control method applied to direct connection range extender for counteracting active torque fluctuation, electronic equipment and medium

Abstract

The invention discloses a control method applied to a direct connection range extender to counteract active torque fluctuation, electronic equipment and a medium. The method comprises the following steps: acquiring an initial calibration parameter of each working condition point according to a rotating speed and torque MAP map of the special hybrid engine; a rack is built, and primary optimization is carried out on initial calibration parameters; through real vehicle calibration, secondary optimization is carried out on the calibration parameters of the primary optimization; three-time optimization is carried out through multi-dimensional strong correlation parameter analysis and parameter setting, and control over the direct connection range extender is achieved through calibration parameters obtained after three-time optimization. The strategy for counteracting the active torque fluctuation is integrated on the software level of the generator control unit, the torque fluctuation of the engine can be effectively restrained in the starting, low-speed operation and shutdown processes of the direct-connection range extender through the strategy, the torque of the system is smoothly output, vibration of the range extender assembly is effectively restrained, and the service life of the range extender assembly is prolonged. And the vehicle NVH quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control, and more particularly to a control method, electronic equipment, and medium for offsetting active torque fluctuations in a direct-connected range extender. Background Art

[0002] Range extender assemblies, consisting of a dedicated hybrid engine and generator, are widely used in extended-range hybrid vehicles. While hybrid engines have been improved and optimized in terms of optimal operating conditions and thermal efficiency compared to traditional engines, they still suffer from the torque fluctuations associated with traditional engines during startup, shutdown, and low-speed operation. Currently, there are two solutions on the market to address the torque fluctuations at the output of hybrid engines used in range extenders. The first is to directly connect a flywheel (or torsional damper) in series with the engine and generator. This solution is more common, and the flywheel (or torque damper) can effectively offset engine torque fluctuations. However, the increase in components increases the cost, axial size, and weight of the range extender system. Furthermore, vibration calibration and tuning of the engine-flywheel-generator connection is a significant challenge, requiring extensive calibration and optimization of the system software (power domain controller software, engine controller software, and generator control unit software). Another solution is to rigidly connect the generator input shaft to the engine output shaft. This solution is called a direct-connect range extender solution. By eliminating the flywheel (or torque damper), the cost, axial size and mass of the range extender system are effectively reduced, which is beneficial to reducing the weight of the entire vehicle. However, there will still be torque fluctuations in the engine-generator connection link.

[0003] At present, a control method for offsetting active torque fluctuations in direct-connected range extenders needs to be developed.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] The present invention proposes a control method, electronic device, and medium for offsetting active torque fluctuations in a direct-connected range extender. By integrating an active torque fluctuation offset strategy into the generator control unit software level, the direct-connected range extender can effectively suppress engine torque fluctuations during startup, low-speed operation, and shutdown, ensuring smooth torque output of the system, thereby effectively suppressing vibration of the range extender assembly and improving vehicle NVH quality.

[0006] In a first aspect, an embodiment of the present disclosure provides a control method for offsetting active torque fluctuations in a direct-connected range extender, comprising:

[0007] Obtain the initial calibration parameters for each operating point based on the hybrid engine speed and torque MAP diagram;

[0008] Build a test bench and optimize the initial calibration parameters;

[0009] Through real vehicle calibration, the calibration parameters optimized once are optimized twice;

[0010] Through three optimizations of multi-dimensional strongly correlated parameter analysis and parameter settings, the control of the direct-connected range extender is achieved through the calibration parameters after three optimizations.

[0011] Preferably, the calibration parameters include a phase advance angle, an application ratio, and an average torque compensation amount.

[0012] Preferably, for any operating point, obtaining initial calibration parameters includes:

[0013] The intermediate application ratio is used as the initial application ratio, and the engine phase advance angle is optimized according to the engine speed fluctuation and the vibration of the passive end of the mount;

[0014] Maintaining the phase advance angle, adjusting the application ratio, and determining the optimal application ratio;

[0015] The average torque compensation amount is determined through adjustment.

[0016] Preferably, if the optimal application ratio differs greatly from the application ratio obtained in the initial phase angle optimization, the optimal application ratio is maintained and the phase advance angle is optimized again.

[0017] Preferably, the bench is built and an optimization is performed on the initial calibration parameters, including:

[0018] The calibration parameters are set and the calibration results are displayed on the test bench. The operating points in the MAP diagram are selected one by one, and the engine advance phase angle, speed, torque and generator speed and torque of each operating point are monitored and recorded in real time. The effect of offsetting the active torque is judged by the amplitude of the speed fluctuation, and the initial calibration parameters are optimized.

[0019] Preferably, through actual vehicle calibration, performing secondary optimization on the calibration parameters optimized once includes:

[0020] The upper computer is connected to the calibration equipment and the vehicle debugging OBD port for parameter calibration. The range extender assembly is connected to the NVH equipment, and the vibration parameters of multiple mount ends connected to the range extender are measured. By comparing the speed fluctuation and the passive end of the mount, the secondary optimized calibration parameters are obtained.

[0021] Preferably, the multi-dimensional strongly correlated parameters include deignition angle, misfire, and phase current.

[0022] In a second aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0023] a memory storing executable instructions;

[0024] A processor runs the executable instructions in the memory to implement the control method for offsetting active torque fluctuations applied to a direct-connected range extender.

[0025] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the control method for offsetting active torque fluctuations applied to a direct-connected range extender.

[0026] Its beneficial effects are:

[0027] In the direct-connected range extender configuration, the present invention uses a generator control unit torque control strategy to achieve the engine's active torque offset function, achieve a vibration reduction effect, and realize automatic and stable calibration of the injection angle, forming a complete set of active torque offset control strategies that act on the entire range extender system. It highlights innovation in lightweight components, miniaturized assembly size, simplified vibration calibration, and low cost. In terms of lightweight components and size, removing the flywheel (or torsional vibration damper) will directly reduce the weight and size of a component level, resulting in a reduction of at least 1kg in assembly weight and at least 6mm in axial size. In terms of vibration calibration, a single generator control unit is easier to calibrate and optimize in terms of both workload and calibration parameters. Compared with the three controllers of the range extender with a flywheel (or torsional vibration damper) to optimize the torque fluctuation joint calibration work, the calibration optimization workload is reduced by at least half, making the calibration work more concise and efficient. In terms of cost, the elimination of the flywheel component reduces the calibration workload, further reducing the development and procurement costs of the entire product.

[0028] The methods and apparatus of the present invention have other features and advantages that will be apparent from or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0030] Figure 1A flow chart showing steps of a control method for offsetting active torque fluctuation applied to a direct-connected range extender according to an embodiment of the present invention is shown.

[0031] Figure 2 A flow chart of obtaining initial calibration parameters for each operating point according to an embodiment of the present invention is shown.

[0032] Figure 3 A simplified diagram of a stand construction according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0034] To facilitate understanding of the solutions and effects of the embodiments of the present invention, three specific application examples are given below. Those skilled in the art should understand that these examples are only for facilitating understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0035] Example 1

[0036] Figure 1 A flow chart showing steps of a control method for offsetting active torque fluctuation applied to a direct-connected range extender according to an embodiment of the present invention is shown.

[0037] like Figure 1 As shown, the control method for offsetting active torque fluctuations applied to a direct-connected range extender includes:

[0038] Step 101, obtaining initial calibration parameters for each operating point based on a hybrid engine speed and torque MAP;

[0039] Step 102: Build a test bench and optimize the initial calibration parameters;

[0040] Step 103: Perform secondary optimization on the calibration parameters obtained through the primary optimization through actual vehicle calibration.

[0041] Step 104 , performing three optimizations through multi-dimensional strongly correlated parameter analysis and parameter settings, and implementing control of the direct-connected range extender through the calibration parameters after the three optimizations.

[0042] In one example, the calibration parameters include a phase advance angle, an application ratio, and an average torque compensation amount.

[0043] In one example, for any operating point, obtaining initial calibration parameters includes:

[0044] The intermediate application ratio is used as the initial application ratio, and the engine phase advance angle is optimized according to the engine speed fluctuation and the vibration of the passive end of the mount;

[0045] Maintaining the phase advance angle, adjusting the application ratio, and determining the optimal application ratio;

[0046] The average torque compensation amount is determined through adjustment.

[0047] In one example, if the optimal application ratio differs greatly from the application ratio obtained in the initial phase angle optimization, the optimal application ratio is maintained and the phase advance angle is optimized again.

[0048] In one example, setting up a test bench and performing an optimization on the initial calibration parameters includes:

[0049] The calibration parameters are set and the calibration results are displayed on the test bench. The operating points in the MAP diagram are selected one by one, and the engine advance phase angle, speed, torque and generator speed and torque of each operating point are monitored and recorded in real time. The effect of offsetting the active torque is judged by the amplitude of the speed fluctuation, and the initial calibration parameters are optimized.

[0050] In one example, through real vehicle calibration, performing a secondary optimization on the calibration parameters of the primary optimization includes:

[0051] The upper computer is connected to the calibration equipment and the vehicle debugging OBD port for parameter calibration. The range extender assembly is connected to the NVH equipment, and the vibration parameters of multiple mount ends connected to the range extender are measured. By comparing the speed fluctuation and the passive end of the mount, the secondary optimized calibration parameters are obtained.

[0052] In one example, the multi-dimensional strongly correlated parameters include deignition angle, misfire, and phase current.

[0053] Figure 2 A flow chart of obtaining initial calibration parameters for each operating point according to an embodiment of the present invention is shown.

[0054] Specifically, if Figure 2 As shown, the initial calibration parameters for each operating point are obtained based on the hybrid-specific engine speed and torque MAP diagram.

[0055] Prepare a hybrid engine speed and torque MAP diagram. The MAP diagram is an operating point diagram consisting of speed points with certain intervals and torque points with certain intervals, which is generally obtained from actual measurements during engine development.

[0056] Select a certain working condition (for example, 1000r / min and 20Nm), take the intermediate application ratio (such as 50%) as the initial application ratio, and optimize the engine phase advance angle based on the engine speed fluctuation and the vibration of the passive end of the mount. The advance angle optimization range is 0-180°, and the optimal advance phase angle is preliminarily determined.

[0057] Maintain the optimal phase angle and adjust the application ratio, which can be gradually increased from 0% to 100% (or increased to the maximum ratio that can be controlled due to the alarm of the generator phase current) to determine the optimal application ratio.

[0058] If the optimal application ratio differs significantly from the application ratio obtained in the initial phase angle optimization, the optimal application ratio is maintained and the phase advance angle is optimized again. Thus, the optimal application ratio and the optimal phase advance angle are determined.

[0059] Taking into account the smoothness of the switching process, the "average torque compensation amount" is introduced. The "average torque compensation amount" is preliminarily determined through adjustment to obtain the optimal "phase advance angle", "application ratio" and "average torque compensation amount" for the selected operating point.

[0060] Adjust the operating point (for example, 1000 r / min and 30 Nm), and repeat the above steps until the optimal "phase advance angle", "application ratio", and "average torque compensation amount" for all operating points are obtained (interpolate and improve the operating points not covered by the calibration to form a calibration table that can be implanted in the software).

[0061] Figure 3 A simplified diagram of a stand construction according to an embodiment of the present invention is shown.

[0062] Build a test bench and optimize the initial calibration parameters. This part is an important part of the optimization strategy. The first part of the strategy is to obtain a calibration form by setting the calibration quantity and performing virtual verification optimization. The generator control unit software integrated into the calibration form can achieve the active offset torque fluctuation function to a certain extent, but the improvement and optimization of the effect must be refined through test bench calibration and actual vehicle calibration to achieve the ultimate ideal offset effect. The test bench construction diagram is as follows Figure 3As shown, two temperature control devices regulate the operating temperatures of the engine, generator, and generator control unit. A bidirectional DC power supply provides low-voltage power to the generator control unit, and the power sensor box (power analyzer) monitors and collects data on the voltage, current, and power input and output of the generator controller. The test bench control system coordinates the power domain controller, engine controller, and generator control unit to enable the range extender to operate according to the engine speed and torque MAP. Through the CAN line, the host computer and test bench computer perform calibration parameter settings and display calibration results. By selecting operating points within the MAP one by one, the engine advance phase angle, speed, torque, and generator speed and torque at each operating point are monitored and recorded in real time. The speed fluctuation amplitude is used to determine the effect of offsetting the active torque, and strategy calibration and optimization are performed.

[0063] Through actual vehicle calibration, the calibration parameters optimized once are optimized for the second time. Because the vibration of the passive end of the suspension is different from that of the actual vehicle, the effect after bench test optimization is still different from that of the actual vehicle, and calibration optimization needs to be performed on the entire vehicle. The actual vehicle calibration is to use the upper computer to connect the calibration equipment and connect to the vehicle debugging OBD port for parameter calibration. The same strategy is used here to optimize the parameters, except that the range extender assembly needs to be connected to the NVH equipment throughout the process to measure the vibration parameters of multiple suspension ends connected to the range extender, such as vibration frequency and vibration amplitude signals. By comparing the speed fluctuation and the vibration of the passive end of the suspension, the optimal "phase advance angle", "application ratio" and "average torque compensation amount" of the selected working point are selected to obtain the optimal vibration reduction effect.

[0064] Three optimizations are performed through multi-dimensional, strongly correlated parameter analysis and parameter settings. This not only considers the active torque offset at a single operating point, but also comprehensively considers multiple, strongly correlated parameters (such as deignition angle, misfire, and phase current). For example, the deignition angle can directly affect the engine output speed to a certain extent, causing drastic speed fluctuations. Here, under operating conditions where the original effect was significant, an active torque cancellation strategy was simultaneously applied using small, medium, and large de-ignition angles. This optimization strategy was then optimized for the vehicle. The results showed significant improvement, with the active torque fluctuation amplitude improved by 9% to 20%. In the vehicle's operational environment, continuous operation, such as starting, parking power generation, and driving power generation, requires consideration. These include torque at speed, torque at constant speed, torque at speed, torque at speed, and torque at speed reduction. By comprehensively calibrating a large number of continuous operating conditions, the final strategy ranges, including effective ranges for large, effective ranges for small, and ineffective ranges, were determined, ultimately forming a calibration table tailored to the vehicle's entire operating range. Once the starting strategy, parking and driving power generation points, and operating condition change paths were determined, control parameters such as the application amplitude were fine-tuned to meet various requirements. Abnormal status information (e.g., misfire) was introduced as a criterion for enabling the active torque fluctuation cancellation function. This ultimately resulted in a module for canceling the active torque fluctuation strategy, which was integrated into the generator control unit software.

[0065] To sum up, the current hybrid engine-side torque fluctuation processing method used in the range extender assembly has disadvantages such as adding components, requiring a large amount of calibration and optimization work for the related controllers, and increasing weight. The direct connection method can effectively reduce components and reduce weight. Moreover, the influence of torque fluctuation can be offset by only calibrating the generator controller to offset the active torque fluctuation strategy, achieving optimization effects such as reducing speed fluctuation by 20% to 30%, improving vibration amplitude by 9% to 20%, and improving noise quality by 1dB to 3dB.

[0066] Example 2

[0067] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; and a processor running the executable instructions in the memory to implement the above-mentioned control method for offsetting active torque fluctuations applied to a direct-connected range extender.

[0068] An electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0069] The memory is used to store non-transitory computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, flash memory, etc.

[0070] The processor may be a central processing unit (CPU) or other form of processing unit having data processing capability and / or instruction execution capability, and may control other components in the electronic device to perform desired functions. In one embodiment of the present disclosure, the processor is used to execute the computer-readable instructions stored in the memory.

[0071] Those skilled in the art should understand that in order to solve the technical problem of how to obtain a good user experience, this embodiment may also include well-known structures such as a communication bus and an interface, and these well-known structures should also be included in the scope of protection of this disclosure.

[0072] For detailed description of this embodiment, please refer to the corresponding description in the aforementioned embodiments, which will not be repeated here.

[0073] Example 3

[0074] An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the control method for offsetting active torque fluctuations applied to a direct-connected range extender is implemented.

[0075] According to an embodiment of the present disclosure, a computer-readable storage medium stores non-transitory computer-readable instructions, which, when executed by a processor, execute all or part of the steps of the aforementioned methods of the embodiments of the present disclosure.

[0076] The above-mentioned computer-readable storage media include, but are not limited to, optical storage media (e.g., CD-ROMs and DVDs), magneto-optical storage media (e.g., MOs), magnetic storage media (e.g., magnetic tapes or mobile hard disks), media with built-in rewritable non-volatile memory (e.g., memory cards), and media with built-in ROM (e.g., ROM cartridges).

[0077] Those skilled in the art should understand that the above description of the embodiments of the present invention is only for the purpose of illustrative purposes only 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 given examples.

[0078] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not 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 control method for offsetting active torque fluctuations in a direct-connected range extender, characterized in that: include: Obtain the initial calibration parameters for each operating point based on the hybrid engine speed and torque MAP diagram; Build a test bench and optimize the initial calibration parameters; Through real vehicle calibration, the calibration parameters optimized once are optimized twice; Through three optimizations of multi-dimensional strongly correlated parameter analysis and parameter settings, the control of the direct-connected range extender is achieved through the calibration parameters after three optimizations.

2. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 1, wherein: The calibration parameters include phase advance angle, application ratio, and average torque compensation.

3. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 2, wherein: For any operating point, the initial calibration parameters include: The intermediate application ratio is used as the initial application ratio, and the engine phase advance angle is optimized according to the engine speed fluctuation and the vibration of the passive end of the mount; Maintaining the phase advance angle, adjusting the application ratio, and determining the optimal application ratio; The average torque compensation amount is determined through adjustment.

4. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 3, wherein: If the optimal application ratio differs greatly from the application ratio obtained in the initial phase angle optimization, the optimal application ratio is maintained and the phase advance angle is optimized again.

5. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 1, wherein: Build a test bench and optimize the initial calibration parameters, including: The calibration parameters are set and the calibration results are displayed on the test bench. The operating points in the MAP diagram are selected one by one, and the engine advance phase angle, speed, torque and generator speed and torque of each operating point are monitored and recorded in real time. The effect of offsetting the active torque is judged by the amplitude of the speed fluctuation, and the initial calibration parameters are optimized.

6. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 1, wherein: Through real vehicle calibration, the secondary optimization of the calibration parameters of the primary optimization includes: The upper computer is connected to the calibration equipment and the vehicle debugging OBD port for parameter calibration. The range extender assembly is connected to the NVH equipment, and the vibration parameters of multiple mount ends connected to the range extender are measured. By comparing the speed fluctuation and the passive end of the mount, the secondary optimized calibration parameters are obtained.

7. The control method for offsetting active torque fluctuations applied to a direct-connected range extender according to claim 1, wherein: Multi-dimensional strongly correlated parameters include deignition angle, misfire, and phase current.

8. An electronic device, characterized in that: The electronic device comprises: a memory storing executable instructions; A processor that runs the executable instructions in the memory to implement the control method for offsetting active torque fluctuations applied to a direct-connected range extender according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the control method for offsetting active torque fluctuations applied to a direct-connected range extender according to any one of claims 1 to 7.

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