Method, device and vehicle for suppressing semi-order noise of hybrid power system

Abstract

The present invention discloses a method, device and vehicle for suppressing semi-order noise of a hybrid power system, belonging to the technical field of engine control. The method includes: obtaining an audio signal inside the vehicle and determining the proportion of semi-order noise according to the audio signal; determining whether the proportion of semi-order noise is greater than a first threshold, and if so, determining a target cylinder associated with the semi-order noise; retarding the ignition angle of the target cylinder until a stop condition is reached and then stopping the retardation. In this way, the cylinder-by-cylinder control technology is used to retard the ignition angle of the target cylinder causing semi-order vibration to reduce the cylinder pressure rise rate, thereby reducing the semi-order vibration of the target cylinder and achieving the purpose of reducing the semi-order noise inside the vehicle. Without overall limiting torque or power, problems such as insufficient vehicle power or voltage imbalance will not occur. That is, the semi-order noise inside the vehicle can be reduced without sacrificing power performance and power preservation performance, and the sound quality inside the vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and particularly to a method and device for suppressing semi-order noise of a hybrid system and a vehicle. Background Art

[0002] Semi-order vibration is a characteristic of an engine. It is not easily recognized under low power loads, but under high power conditions, if the semi-order vibration cannot be well balanced, relatively large semi-order noise will be generated. Moreover, with the development of hybridization, the number of low-speed high-load working conditions increases, and this problem greatly affects the user experience.

[0003] The prior art aims to reduce semi-order noise by overall restricting torque or power, but the above methods are likely to cause problems such as insufficient vehicle power or voltage imbalance. Summary of the Invention

[0004] To this end, the present invention proposes a method for suppressing semi-order noise of a hybrid system, and also proposes a device for suppressing semi-order noise of a hybrid system, a computing device, and a computer-readable storage medium, aiming to at least to a certain extent solve the technical problem that vehicle power shortage or voltage imbalance is likely to occur when reducing semi-order noise by restricting torque or power in the related art.

[0005] To achieve the above object, a first aspect embodiment of the present invention proposes a method for suppressing semi-order noise of a hybrid system, the method comprising:

[0006] Obtain an audio signal inside the vehicle, and determine the proportion of semi-order noise according to the audio signal;

[0007] Determine whether the proportion of semi-order noise is greater than a first threshold. If so, determine a target cylinder associated with the semi-order noise;

[0008] Retard the ignition angle of the target cylinder until a stop condition is reached and then stop retarding.

[0009] According to an embodiment of the present invention, retarding the ignition angle of the target cylinder until a stop condition is reached and then stopping retarding includes:

[0010] Retard the ignition angle of the target cylinder by a preset angle;

[0011] Obtain the audio signal again, and determine whether the proportion of semi-order noise is greater than the first threshold according to the audio signal;

[0012] If so, return to execute the step of retarding the ignition angle of the target cylinder by the preset angle; if not, stop retarding.

[0013] According to an embodiment of the present invention, after pushing the ignition angle of the target cylinder backward by a preset angle, the following steps are further included:

[0014] Increment the number of cycles by 1 and determine whether the number of cycles is greater than a second threshold;

[0015] If so, stop the backward push; if not, re-acquire the audio signal and determine whether the proportion of the half-order noise in the audio signal is greater than a first threshold according to the audio signal;

[0016] If so, return to execute the step of pushing the ignition angle of the target cylinder backward by a preset angle; if not, stop the backward push.

[0017] According to an embodiment of the present invention, determining the target cylinder associated with the half-order noise includes:

[0018] Acquire the crankshaft pulse signal and the ignition signal;

[0019] Determine the target rotation angle corresponding to the half-order noise according to the ignition signal, the crankshaft pulse signal, and the audio signal;

[0020] Determine the target cylinder from each cylinder according to the target rotation angle.

[0021] According to an embodiment of the present invention, determining the proportion of the half-order noise according to the audio signal includes:

[0022] Perform filtering processing and Fourier transform on the audio signal to obtain an order spectrum;

[0023] Determine the proportion of the half-order noise according to the frequency band corresponding to the half-order noise and the order spectrum.

[0024] According to an embodiment of the present invention, the vehicle is a hybrid vehicle or a plug-in hybrid vehicle equipped with an extender-type hybrid power system.

[0025] According to an embodiment of the present invention, after pushing the ignition angle of the target cylinder backward until the stop condition is reached and then stopping the backward push, the following steps are further included:

[0026] Record the current power point data and the current ignition angle data of the target cylinder.

[0027] To achieve the above object, an embodiment of the second aspect of the present invention proposes a device for suppressing half-order noise in a hybrid power system, and the device includes:

[0028] A first determination module, configured to acquire an audio signal in the vehicle and determine the proportion of the half-order noise according to the audio signal;

[0029] A second determination module, configured to determine whether the proportion of the half-order noise is greater than a first threshold, and if so, determine the target cylinder associated with the half-order noise;

[0030] A noise suppression module is configured to push back the ignition angle of a target cylinder until a stop condition is reached and then stop pushing back.

[0031] To achieve the above object, an embodiment of the third aspect of the present invention provides a vehicle, which includes an in-vehicle controller and an engine controller;

[0032] The in-vehicle controller is configured to obtain an audio signal inside the vehicle and determine the proportion of the half-order noise according to the audio signal; determine whether the proportion of the half-order noise is greater than a first threshold, and if so, send a half-order noise suppression instruction to the engine controller;

[0033] The engine controller is configured to, in response to the half-order noise suppression instruction, determine a target cylinder associated with the half-order noise; push back the ignition angle of the target cylinder until a stop condition is reached and then stop pushing back.

[0034] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a computing device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method for suppressing the half-order noise of the hybrid power system as described in any one of the above first aspects is implemented.

[0035] To achieve the above object, an embodiment of the fifth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the method for suppressing the half-order noise of the hybrid power system as described in any one of the above first aspects is implemented.

[0036] The method for suppressing the half-order noise of the hybrid power system provided by the embodiments of the present invention obtains an audio signal inside the vehicle and determines the proportion of the half-order noise according to the audio signal; determines whether the proportion of the half-order noise is greater than a first threshold, and if so, determines a target cylinder associated with the half-order noise; pushes back the ignition angle of the target cylinder until a stop condition is reached and then stops pushing back. In this way, the cylinder-by-cylinder control technology is used to push back the ignition angle of the target cylinder that causes the half-order vibration, so as to reduce the cylinder pressure rise rate, and further reduce the half-order vibration of the target cylinder, achieving the purpose of reducing the half-order noise inside the vehicle. Without overall limiting the torque or power, there will be no problems such as insufficient vehicle power or voltage imbalance. That is, the half-order noise inside the vehicle can be reduced without sacrificing the power performance and power retention performance, and the sound quality inside the vehicle can be improved.

[0037] The additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1It is a flowchart of a method for suppressing semi-order noise of a hybrid power system according to an embodiment of the present invention;

[0039] Figure 2 It is a schematic flowchart of another method for suppressing semi-order noise of a hybrid power system according to an embodiment of the present invention;

[0040] Figure 3 It is a structural block diagram of a device for suppressing semi-order noise of a hybrid power system according to an embodiment of the present invention;

[0041] Figure 4 It is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

[0042] Figure 5 It is a structural block diagram of a computing device according to an embodiment of the present invention. Detailed Embodiments

[0043] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0044] For hybrid electric vehicles or plug-in hybrid electric vehicles equipped with a range extender type hybrid power system, in situations such as high-power charging during idling, high-power power generation during range extension operation, and high-power driving (climbing) at low speeds, the power demand of the engine is relatively large, while the vehicle speed is in a low state, lacking the masking of road noise and wind noise. Semi-order noise becomes more easily identifiable under high-power conditions. Therefore, there is an urgent need for a method that can improve semi-order noise without affecting the normal operation of the vehicle. And this solution, based on the principle of semi-order generation, adopts cylinder-by-cylinder control technology to retract the ignition angle of the main cylinders causing semi-order vibration (the purpose is to reduce the cylinder pressure rise rate), so that semi-order noise is improved.

[0045] The method, device, computing device, and storage medium for suppressing semi-order noise of a hybrid power system proposed in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0046] Figure 1 It is a flowchart of a method for suppressing semi-order noise of a hybrid power system according to an embodiment of the present invention, and the method includes the following steps.

[0047] Step 101: Obtain the audio signal inside the vehicle and determine the proportion of semi-order noise according to the audio signal.

[0048] The vehicle to which the embodiments of the present invention are applied may be a hybrid electric vehicle or a plug-in hybrid electric vehicle equipped with an extender-type hybrid power system.

[0049] In a specific implementation, when the user authorizes the recording and use of the in-vehicle sound, the in-vehicle audio acquisition device (such as a pickup, a microphone, etc.) can collect the in-vehicle audio signal, and these audio signals can be the sounds within a preset period of time. Moreover, the audio acquisition device can send the audio signal to the vehicle-mounted controller, and the vehicle-mounted controller determines the proportion of the half-order noise according to the audio signal.

[0050] According to an embodiment of the present invention, the specific implementation of determining the proportion of the half-order noise according to the audio signal may include: performing filtering processing and Fourier transform on the audio signal to obtain a cepstrum; determining the proportion of the half-order noise according to the frequency band corresponding to the half-order noise and the cepstrum.

[0051] Among them, the cepstrum is a tool for analyzing the spectral characteristics of a signal. It converts the information in the frequency domain back to the time domain through the inverse transform of the Fourier transform, so as to reveal the periodic components of the signal.

[0052] That is to say, the audio signal can be first filtered to remove the unnecessary frequency components, and then the Fourier transform is performed on the filtered audio signal to generate the cepstrum corresponding to the audio signal. The energy of the half-order noise is determined from the cepstrum according to the frequency band corresponding to the half-order noise, and then the proportion of the half-order noise is determined.

[0053] In a specific implementation, determining the proportion of the half-order noise according to the audio signal includes the following steps: filtering the audio signal - performing Fourier transform - calculating the power spectrum - performing inverse Fourier transform - calculating the half-order energy - calculating the half-order proportion. Specifically, the audio signal can be filtered by a filter according to a preset sampling frequency to remove the unnecessary frequency components to obtain the filtered audio signal. The short-time Fourier transform (STFT) is performed on the filtered audio signal to convert it from the time domain to the frequency domain, and then the power spectrum is calculated from the converted result. The inverse Fourier transform is performed on the power spectrum to obtain the cepstrum of the audio signal. In the cepstrum, the low-order components usually correspond to the low-frequency components in the audio signal, while the high-order components correspond to the high-frequency components in the audio signal. The total energy of the frequency band corresponding to the half-order noise is determined, and the ratio of it to the total energy of the entire cepstrum is calculated to obtain the proportion of the half-order energy.

[0054] As an example, the filter can be a low-pass, high-pass, band-pass, or band-stop filter, which can be specifically determined according to actual requirements. The power spectrum is the square of the frequency components of the audio signal. The frequency band corresponding to the half-order noise can be 100 Hz - 1000 Hz, which can be specifically set according to the actual situation.

[0055] In the embodiment of the present invention, in-vehicle audio data is collected to obtain an audio signal. After filtering and short-time Fourier transform processing of the audio signal, an order spectrum is obtained. By analyzing the order spectrum, the half-order proportion is determined to determine whether the half-order noise in the audio data is too large, and then whether to perform noise reduction processing.

[0056] Step 102: Determine whether the proportion of the half-order noise is greater than a first threshold. If so, determine the target cylinder associated with the half-order noise.

[0057] Among them, the first threshold can be set and adjusted according to actual requirements. For example, the first threshold can be 90%.

[0058] In specific implementation, if the noise is not less than the first threshold, it means that the half-order noise is not obvious, then the audio signal is re-obtained and the subsequent steps are executed; if the noise is greater than the first threshold, it means that the half-order noise is too large and needs to be optimized. And in the embodiment of the present invention, according to the generation principle of the half-order noise, when it is determined that the half-order noise needs to be optimized, the target cylinder generating the half-order noise is determined.

[0059] In some embodiments, the specific implementation of determining the target cylinder associated with the half-order noise may include: obtaining a crankshaft pulse signal and an ignition signal; determining a target angle corresponding to the half-order noise according to the ignition signal, the crankshaft pulse signal, and the audio signal; and determining the target cylinder from each cylinder according to the target angle.

[0060] Among them, the crankshaft pulse signal includes the angle of the crankshaft, and the ignition signal includes the angle of the crankshaft when each cylinder ignites.

[0061] In specific implementation, the audio signal can be converted into an angle to determine the angle of the crankshaft at the moment when the half-order noise is the largest, that is, to determine the target angle corresponding to the half-order noise, and then according to the angle of the crankshaft when each cylinder ignites, determine the target cylinder corresponding to the target angle.

[0062] In the embodiment of the present invention, when it is determined that the half-order noise is large, by extracting the crankshaft pulse signal and ignition information of the engine, it is identified which cylinder generates the half-order noise, and then the cylinder is separately controlled using the cylinder splitting technology to reduce the half-order vibration caused by the cylinder.

[0063] Step 103: Retard the ignition angle of the target cylinder until the stop condition is reached, then stop the retardation.

[0064] In an embodiment of the present invention, when the ignition angle of the target cylinder is pushed back, it can be pushed back cyclically and judged in steps of 1 degree until the half-order proportion is no more than the first threshold or the number of cycles is too many, and the push back is stopped, which can reduce the half-order vibration without affecting the normal use of the vehicle.

[0065] According to one embodiment of the present invention, the specific implementation of pushing back the ignition angle of the target cylinder until a stop condition is reached and then stopping the pushing back may include: pushing back the ignition angle of the target cylinder according to a preset angle; reacquiring an audio signal, and determining whether the proportion of half-order noise is greater than a first threshold value based on the audio signal; if so, returning to execute the step of pushing back the ignition angle of the target cylinder according to a preset angle; if not, stopping the pushing back.

[0066] Among them, the preset angle can be 1 degree or 3 degrees, which can be set and adjusted according to actual needs.

[0067] In a specific implementation, the ignition angle of the target cylinder can be adjusted according to a preset angle, and then the audio signal in the vehicle is reacquired, and the current half-order noise ratio is re-determined according to the audio signal, and whether the ratio is greater than the first threshold. If not, the pushback is stopped; if so, the ignition angle of the target cylinder is pushed back again according to the preset angle, and the step of reacquiring the audio signal in the vehicle is returned to be executed until the half-order noise ratio determined at a certain time is not greater than the first threshold, and the pushback of the ignition angle of the target cylinder is stopped.

[0068] Taking the preset angle of 1 degree as an example, after the ignition angle of the target cylinder is pushed back by 1 degree, the audio signal is reacquired, and the proportion of half-order noise is determined based on the audio signal. Assuming that the proportion is greater than the first threshold, the ignition angle of the target cylinder is pushed back by 1 degree again, and the audio signal is reacquired, and the proportion of half-order noise is determined based on the audio signal. Assuming that the proportion is not greater than the first threshold, the push back is stopped, which means that the half-order noise generated by the target cylinder has been reduced.

[0069] Furthermore, since the ignition angle of the cylinder is limited in range and cannot be increased or decreased indefinitely, when the preset angle of each pushback is determined, the maximum number of cycles (i.e., the second threshold) can be set to ensure the normal use of the engine while reducing the half-order noise.

[0070] Therefore, after pushing back the ignition angle of the target cylinder according to the preset angle, it also includes: adding 1 to the number of cycles, and determining whether the number of cycles is greater than a second threshold; if so, stopping the push back; if not, reacquiring the audio signal, and determining whether the proportion of half-order noise is greater than the first threshold based on the audio signal; if so, returning to execute the step of pushing back the ignition angle of the target cylinder according to the preset angle; if not, stopping the push back.

[0071] Among them, the second threshold is the maximum number of cycles, which can be set and adjusted according to actual requirements, and the setting of this second threshold is related to the preset angle and the adjustment range limit of the ignition angle. For example, assuming that the adjustment range of the ignition angle is 6 degrees, if the preset angle is 1 degree, the second threshold can be 6; if the preset angle is 3 degrees, the second threshold can be 2.

[0072] In specific implementation, the ignition angle of the target cylinder can be adjusted according to the preset angle, and the number of cycles is incremented by 1. It is determined whether the number of cycles is greater than the second threshold. If so, the backward push is stopped; if not, the audio signal in the vehicle is retrieved again, and the proportion of the current half-order noise is determined again according to the audio signal, and whether the proportion is greater than the first threshold. If not, the backward push is stopped; if so, the ignition angle of the target cylinder is pushed backward again according to the preset angle, and the step of incrementing the number of cycles by 1 is returned and subsequent various steps are executed.

[0073] Taking the preset angle of 3 degrees and the second threshold of 2 as an example, after the ignition angle of the target cylinder is pushed backward by 1 degree, the number of cycles is incremented by 1. At this time, the number of cycles is 1, which is less than the second threshold, so the audio signal is retrieved again, and the proportion of the half-order noise is determined according to the audio signal. Assuming that the proportion is greater than the first threshold, the ignition angle of the target cylinder is pushed backward by 1 degree again, and the number of cycles is incremented by 1. At this time, the number of cycles is 2, which is equal to the second threshold, so the audio signal is retrieved again, and the proportion of the half-order noise is determined according to the audio signal. Assuming that the proportion is greater than the first threshold, the ignition angle of the target cylinder is pushed backward by 1 degree again, and the number of cycles is incremented by 1. At this time, the number of cycles is 3, which is greater than the second threshold, so the backward push is stopped.

[0074] In the embodiment of the present invention, through the cylinder-by-cylinder control technology, the ignition angle of the target cylinder is pushed backward individually, with the preset angle as the step, and gradually pushed backward until the half-order noise is less than the first threshold, or the maximum number of cycles can also be set and stopped when the number of cycles is greater than the maximum number of cycles, so as to achieve the effect of reducing the half-order vibration of the target cylinder.

[0075] Further, if the situation of large half-order noise occurs during subsequent operation, in order to quickly suppress the half-order vibration, the current power point data and the ignition angle data of the target cylinder can be recorded after the backward push is stopped this time, so that when the power exceeds the power point data subsequently, the ignition angle of the target cylinder is automatically pushed backward according to the ignition angle data.

[0076] The method for suppressing the half-order noise of the hybrid system provided by the embodiment of the present invention extracts the contribution of the half-order through the extraction of the in-vehicle sound and the analysis of the modulation spectrum, and judges the energy of the half-order. When it is considered that the contribution of the half-order exceeds the first threshold, it is necessary to extract the crankshaft pulse signal and the ignition signal of the engine, identify the relevance to the target cylinder. After the identification, through the cylinder splitting control technology, the ignition angle of the target cylinder is retracted to reduce the cylinder pressure rise rate and change the combustion explosion force of the target cylinder, thereby reducing the half-order vibration caused by this cylinder and achieving the purpose of reducing the in-vehicle half-order noise. The above method does not overall limit the torque or power, so there will be no problems such as insufficient vehicle power or voltage imbalance, and the above method has little impact on emissions, fuel consumption, and thermal damage performance. In this way, the in-vehicle half-order noise can be reduced without sacrificing the power performance and power retention performance, and the in-vehicle sound quality can be improved.

[0077] Figure 2 It is a schematic flowchart of another method for suppressing the half-order noise of the hybrid system provided by the embodiment of the present invention.

[0078] Under the condition of obtaining the sound collection authorization, the in-vehicle pick-up (microphone) extracts the in-vehicle audio data (audio signal), performs filtering and STFT modulation spectrum analysis, extracts the half-order proportion in the frequency band (100Hz - 1000Hz), and judges whether the half-order proportion is greater than the first threshold. If not, no processing is required and the loop ends. If so, the VCU (Vehicle Control Unit) sends an instruction to the EMS (Engine Management System). The EMS analyzes through the crankshaft pulse signal and the ignition signal, determines that the half-order vibration is caused by the target cylinder, and through the cylinder splitting control technology, retracts the ignition angle of the target cylinder alone in steps of 1° (maximum 6°), and records the number of cycles and the ignition angle data. Judges whether the number of cycles is greater than the second threshold. If so, the loop ends; if not, continue to extract the in-vehicle audio data with the in-vehicle pick-up and loop judgment until the half-order proportion in the frequency band (100Hz - 1000Hz) is not greater than the first threshold, then record and store the power point data and the ignition angle data of the target cylinder retraction. During the subsequent operation, when the power exceeds the power point data, the target cylinder will be automatically retracted to the specified ignition angle.

[0079] Applying this solution, when the engine makes a rattling sound at high power and low speed, the vehicle can automatically optimize the control software to achieve the suppression of half-order vibration for different vehicles and improve the in-vehicle sound quality.

[0080] Figure 3It is a structural block diagram of a device for suppressing the semi-order noise of a hybrid power system according to an embodiment of the present invention. The device includes:

[0081] A first determination module 301, configured to obtain an audio signal in the vehicle and determine the proportion of semi-order noise according to the audio signal;

[0082] A second determination module 302, configured to determine whether the proportion of semi-order noise is greater than a first threshold. If so, determine the target cylinder associated with the semi-order noise;

[0083] A noise suppression module 303, configured to push back the ignition angle of the target cylinder until the stop condition is reached and then stop the push-back.

[0084] According to an embodiment of the present invention, the noise suppression module 303 is further configured to:

[0085] Push back the ignition angle of the target cylinder by a preset angle;

[0086] Re-obtain the audio signal and determine whether the proportion of semi-order noise is greater than the first threshold according to the audio signal;

[0087] If so, return to execute the step of pushing back the ignition angle of the target cylinder by a preset angle; if not, stop the push-back.

[0088] According to an embodiment of the present invention, the noise suppression module 303 is further configured to:

[0089] Increment the number of cycles by 1 and determine whether the number of cycles is greater than a second threshold;

[0090] If so, stop the push-back; if not, re-obtain the audio signal and determine whether the proportion of semi-order noise is greater than the first threshold;

[0091] If so, return to execute the step of pushing back the ignition angle of the target cylinder by a preset angle; if not, stop the push-back.

[0092] According to an embodiment of the present invention, the second determination module 302 is further configured to:

[0093] Obtain a crankshaft pulse signal and an ignition signal;

[0094] Determine the target rotation angle corresponding to the semi-order noise according to the ignition signal, the crankshaft pulse signal, and the audio signal;

[0095] Determine the target cylinder from each cylinder according to the target rotation angle.

[0096] According to an embodiment of the present invention, the first determination module 301 is further configured to:

[0097] Filter the audio signal and perform Fourier transform to obtain the order spectrum;

[0098] Determine the proportion of the half-order noise according to the frequency band corresponding to the half-order noise and the order spectrum.

[0099] According to an embodiment of the present invention, the vehicle is a hybrid vehicle or a plug-in hybrid vehicle equipped with an extender-type hybrid power system.

[0100] According to an embodiment of the present invention, it further includes a recording module configured to:

[0101] Record the current power point data and the current ignition angle data of the target cylinder.

[0102] Applying the method for suppressing the half-order noise of the hybrid power system provided by the embodiment of the present invention, through the principle of half-order generation, the post-push ignition angle of the target cylinder causing the half-order vibration is performed by using the cylinder-by-cylinder control technology to reduce the cylinder pressure rise rate, thereby reducing the half-order vibration of the target cylinder and achieving the purpose of reducing the half-order noise in the vehicle. Without overall restricting torque or power, there will be no problems such as insufficient vehicle power or voltage imbalance, and the above method has little impact on emissions, fuel consumption, and thermal damage performance. In this way, the half-order noise in the vehicle can be reduced without sacrificing power performance and power retention performance, and the sound quality in the vehicle can be improved.

[0103] The above is a schematic solution of a device for suppressing the half-order noise of a hybrid power system according to an embodiment of the present invention. It should be noted that the technical solution of the device for suppressing the half-order noise of the hybrid power system and the technical solution of the method for suppressing the half-order noise of the hybrid power system belong to the same concept. For the details not described in the technical solution of the device for suppressing the half-order noise of the hybrid power system, reference can be made to the description of the technical solution of the method for suppressing the half-order noise of the hybrid power system.

[0104] Figure 4 It is a schematic structural diagram of a vehicle according to an embodiment of the present invention. The vehicle includes a vehicle-mounted controller 401 and an engine controller 402;

[0105] The vehicle-mounted controller 401 is used to obtain the audio signal in the vehicle and determine the proportion of the half-order noise according to the audio signal; determine whether the proportion of the half-order noise is greater than a first threshold. If so, send a half-order noise suppression instruction to the engine controller 402;

[0106] The engine controller 402 is used to determine the target cylinder associated with the half-order noise in response to the half-order noise suppression instruction; perform post-push on the ignition angle of the target cylinder until the stop condition is reached and then stop the post-push.

[0107] In an embodiment of the present invention, the vehicle-mounted controller 401 may be a VCU, and the engine controller 402 may be an EMS.

[0108] As an example, the vehicle-mounted controller 401 filters and performs Fourier transform on the acquired audio signal in the vehicle to obtain an order spectrum; according to the frequency band corresponding to the half-order noise and the order spectrum, the proportion of the half-order noise is determined. When it is determined that the proportion of the half-order noise is greater than the first threshold, a half-order noise suppression instruction is sent to the engine controller 402. After receiving the half-order noise suppression instruction, the engine controller 402 acquires the crankshaft pulse signal and the ignition signal, and determines the target rotation angle corresponding to the half-order noise according to the ignition signal, the crankshaft pulse signal, and the audio signal; according to the target rotation angle, the target cylinder is determined from each cylinder.

[0109] As an example, after the engine 402 determines the target cylinder, it retards the ignition angle of the target cylinder by a preset angle, then acquires the audio signal again, and determines whether the proportion of the half-order noise is greater than the first threshold according to the audio signal. If so, the step of retarding the ignition angle of the target cylinder by the preset angle is returned for execution; if not, the retarding is stopped.

[0110] Further, there is an angle limit for the ignition angle of the cylinder. Therefore, the maximum number of cycles (i.e., the second threshold) can be preset. After each time the ignition angle of the target cylinder is retarded by the preset angle, the number of cycles is incremented by 1, and it is determined whether the number of cycles is greater than the second threshold. If so, the retarding is stopped; if not, the audio signal is acquired again, and it is determined whether the proportion of the half-order noise is greater than the first threshold according to the audio signal. If so, the step of retarding the ignition angle of the target cylinder by the preset angle is returned for execution; if not, the retarding is stopped.

[0111] Further, after the retarding is stopped, the current power point data and the current ignition angle data of the target cylinder can be recorded, so that during subsequent operation, when the power exceeds the power point data, the ignition angle of the target cylinder can be automatically retarded.

[0112] It should be noted that the implementation process of this embodiment is the same as that of the above steps 101-103. For parts not specifically described in this embodiment, reference can be made to the relevant descriptions of the above embodiments, and this embodiment will not be elaborated herein.

[0113] Applying the method for suppressing the half-order noise of the hybrid power system provided by the embodiments of the present invention, through the principle of half-order generation, the cylinder-by-cylinder control technology is adopted to retard the ignition angle of the target cylinder causing half-order vibration, so as to reduce the cylinder pressure rise rate, thereby reducing the half-order vibration of the target cylinder and achieving the purpose of reducing the half-order noise in the vehicle. Since the torque or power is not globally restricted, there will be no problems of insufficient vehicle power or voltage imbalance, and the above method has little impact on emissions, fuel consumption, and heat damage performance. Thus, the half-order noise in the vehicle can be reduced without sacrificing the power performance and power retention performance, and the sound quality in the vehicle can be improved.

[0114] Figure 5 It is a schematic structural diagram of a computing device according to an embodiment of the present invention. The computing device includes: a memory 501, a processor 502, and a computer program stored on the memory and executable on the processor 502. When the processor 502 executes the computer program, it implements a method for suppressing the half-order noise of a hybrid power system as proposed in any of the above embodiments.

[0115] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements a method for suppressing the half-order noise of a hybrid power system as proposed in any of the above embodiments.

[0116] Note that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection part with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0117] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0118] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0119] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0120] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed" etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for suppressing half-order noise of a hybrid power system, characterized in that: The method comprises: Acquire an audio signal in the vehicle, and determine a proportion of half-order noise according to the audio signal; determining whether the proportion of the half-order noise is greater than a first threshold, and if so, determining a target cylinder associated with the half-order noise; Pushing back the ignition angle of the target cylinder until a stop condition is reached and then stopping the push back; The step of pushing back the ignition angle of the target cylinder until a stop condition is reached and then stopping the pushing back comprises: Pushing back the ignition angle of the target cylinder according to a preset angle; reacquiring an audio signal, and determining, according to the audio signal, whether the proportion of the half-order noise is greater than the first threshold; If yes, then return to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, then stop pushing back; After pushing back the ignition angle of the target cylinder according to the preset angle, the method further includes: Add 1 to the number of cycles, and determine whether the number of cycles is greater than a second threshold; If yes, stop pushing back; if no, reacquire the audio signal, and determine whether the proportion of the half-order noise is greater than the first threshold according to the audio signal; If yes, the process returns to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, the process stops pushing back.

2. The method according to claim 1, characterized in that The determining of a target cylinder associated with the half-order noise comprises: Obtain crankshaft pulse signal and ignition signal; determining a target rotation angle corresponding to the half-order noise according to the ignition signal, the crankshaft pulse signal and the audio signal; The target cylinder is determined from the cylinders according to the target rotation angle.

3. The method according to claim 1, characterized in that The determining the proportion of half-order noise according to the audio signal includes: Performing filtering and Fourier transform on the audio signal to obtain an order spectrum; The proportion of the half-order noise is determined according to the frequency band corresponding to the half-order noise and the order spectrum.

4. The method according to any one of claims 1 to 3, characterized in that: The vehicle is a hybrid electric vehicle or a plug-in hybrid electric vehicle equipped with a range-extender type hybrid power system.

5. The method according to any one of claims 1 to 3, characterized in that: After pushing back the ignition angle of the target cylinder until the stop condition is reached and then stopping the push back, the method further includes: The current power point data and the current ignition angle data of the target cylinder are recorded.

6. A device for suppressing half-order noise of a hybrid power system, characterized in that: The device comprises: A first determination module is configured to obtain an audio signal in the vehicle and determine a proportion of half-order noise according to the audio signal; A second determination module is configured to determine whether the proportion of the half-order noise is greater than a first threshold, and if so, determine a target cylinder associated with the half-order noise; A noise suppression module is configured to push back the ignition angle of the target cylinder until a stop condition is reached and then stop pushing back; The step of pushing back the ignition angle of the target cylinder until a stop condition is reached and then stopping the pushing back comprises: Pushing back the ignition angle of the target cylinder according to a preset angle; reacquiring an audio signal, and determining, according to the audio signal, whether the proportion of the half-order noise is greater than the first threshold; If yes, then return to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, then stop pushing back; After pushing back the ignition angle of the target cylinder according to the preset angle, the method further includes: Add 1 to the number of cycles, and determine whether the number of cycles is greater than a second threshold; If yes, stop pushing back; if no, reacquire the audio signal, and determine whether the proportion of the half-order noise is greater than the first threshold according to the audio signal; If yes, the process returns to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, the process stops pushing back.

7. A vehicle, characterized in that: The vehicle includes an onboard controller and an engine controller; The vehicle controller is used to obtain an audio signal in the vehicle, and determine the proportion of half-order noise according to the audio signal; determine whether the proportion of the half-order noise is greater than a first threshold, and if so, send a half-order noise suppression instruction to the engine controller; The engine controller is used to determine a target cylinder associated with the half-order noise in response to the half-order noise suppression instruction; push back the ignition angle of the target cylinder until a stop condition is reached and then stop pushing back; The step of pushing back the ignition angle of the target cylinder until a stop condition is reached and then stopping the pushing back comprises: Pushing back the ignition angle of the target cylinder according to a preset angle; reacquiring an audio signal, and determining, according to the audio signal, whether the proportion of the half-order noise is greater than the first threshold; If yes, then return to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, then stop pushing back; After pushing back the ignition angle of the target cylinder according to the preset angle, the method further includes: Add 1 to the number of cycles, and determine whether the number of cycles is greater than a second threshold; If yes, stop pushing back; if no, reacquire the audio signal, and determine whether the proportion of the half-order noise is greater than the first threshold according to the audio signal; If yes, the process returns to the step of pushing back the ignition angle of the target cylinder according to the preset angle; if no, the process stops pushing back.

8. A computing device, characterized in that include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for suppressing half-order noise of a hybrid power system as described in any one of claims 1 to 5 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for suppressing half-order noise of a hybrid power system as described in any one of claims 1 to 5 is implemented.

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