Hybrid vehicle type NVH calibration method
Through the implementation of the NVH calibration method on the hybrid model, combined with the optimal interval curve and vibration noise MAP of fuel economy, the optimal control strategy is selected to solve the problem of lack of fuel economy and vehicle comfort in existing technologies. Both fuel economy and vehicle comfort take into account the effect.
Patent Information
- Application Number
- CN202411478060.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-01-28
AI Technical Summary
The control strategy of existing hybrid models mainly focuses on fuel economy as the optimization goal, and lacks calibration methods that take into account both fuel economy and vehicle comfort, resulting in high noise and roar in vehicle acceleration, and the later adjustment cost is high and the cycle is long.
Provide a hybrid model NVH calibration method. By arranging the detection of vibration and noise on the test prototype, the data is collected and analyzed. It iterative verification is performed to take into account fuel economy and vehicle comfort.
Earlier identification of the vibration and noise of the vehicle in the early calibration stage can better take into account the fuel economy and the performance comfort of the NVH, and reduce the cost and cycle of later adjustment.
Smart Images
Figure BDA0005096625050000041
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of automobile technology, and in particular, relates to a NVH calibration method for a hybrid vehicle. Background Art
[0002] Compared with traditional fuel vehicles, hybrid models are becoming more and more concerned by major automakers due to the complexity of their power system control strategies. Unreasonable matching control logic can easily cause problems such as loud noise and roar during vehicle acceleration, and the cost of subsequent adjustment and modification is high and the cycle is long.
[0003] However, the current control strategy of hybrid vehicles mainly takes fuel economy as the main optimization target, and the existing technology lacks a calibration method that can take into account both fuel economy and vehicle comfort.
[0004] It is desirable to provide an improved NVH calibration method for hybrid vehicles, particularly with regard to how to ensure a balance between fuel economy and vehicle comfort. Summary of the invention
[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hybrid vehicle NVH calibration method, the purpose of which is to ensure that both fuel economy and vehicle comfort can be taken into account.
[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a hybrid vehicle NVH calibration method, comprising the steps of:
[0007] S1. Prepare a test vehicle and arrange vibration and noise detection devices in the test vehicle;
[0008] S2, starting the hybrid powertrain of the test vehicle, changing the excitation force of the hybrid powertrain, and collecting the in-vehicle vibration and noise data of the test vehicle under the effective torque excitation;
[0009] S3. Analyze the acquired vibration and noise data;
[0010] S4, selecting the optimal control strategy of the hybrid powertrain according to the optimal range curve of the hybrid powertrain fuel economy and the vibration and noise MAP;
[0011] S5. Perform iterative verification on the test vehicle based on the selected hybrid powertrain optimal control strategy.
[0012] The detection device comprises a vibration sensor, which is arranged at the twelve o'clock position of the steering wheel in the test sample vehicle and at the guide rail of the main driver's seat.
[0013] The detection device also includes a noise sensor, which is arranged next to the right ear of the driver of the test vehicle and next to the left ear of the rear right seat passenger.
[0014] In step S3, the advantages and key avoidance points of vibration noise are selected.
[0015] The vibration noise advantages include a position point where the sound pressure level of the acceleration noise in the test sample vehicle is controlled below a first set value and the vibration is controlled below a second set value.
[0016] The first setting value is 60dB(A), and the second setting value is 0.02g.
[0017] The key avoidance points include the roaring points in the test vehicle.
[0018] The key avoidance points also include resonance points within the test vehicle.
[0019] In step S2, a fixed effective torque T is used. ei , changing the crankshaft speed n of the hybrid powertrain at a fixed rate, thereby changing the hybrid powertrain excitation force, and obtaining the effective torque T ei The hybrid power matching strategy is studied by using the vibration and noise of key response points in the vehicle under excitation.
[0020] In step S2, a fixed effective torque T is used. e1 , increase the hybrid powertrain crankshaft speed n from n1 to n at a fixed time t m , and then the effective torque T of the hybrid powertrain is obtained ei Vibration and noise of key response points in the vehicle under excitation; fixed effective torque T e2 , and increase the hybrid powertrain crankshaft speed n from n2 to n at the same fixed time t m , and then the effective torque T of the hybrid powertrain is obtained e2 Vibration and noise of key response points in the vehicle under excitation; ... Fixed effective torque T em , at the same fixed time t, the hybrid powertrain crankshaft speed n is reduced from n m Pull up to n m , and then the effective torque T of the hybrid powertrain is obtained em Vibration and noise of key response points in the vehicle under excitation.
[0021] The hybrid vehicle NVH calibration method of the present invention can identify vehicle vibration and noise problem points earlier in the early calibration stage; it can better balance fuel economy and NVH performance comfort, and avoid early calibration only unilaterally considering fuel economy. DETAILED DESCRIPTION
[0022] The specific implementation methods of the present invention are further explained in detail below through the description of embodiments, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.
[0023] The present invention provides a hybrid vehicle NVH calibration method, comprising the following steps:
[0024] S1. Prepare a test vehicle and arrange vibration and noise detection devices in the test vehicle;
[0025] S2, starting the hybrid powertrain of the test vehicle, changing the excitation force of the hybrid powertrain, and collecting the in-vehicle vibration and noise data of the test vehicle under the effective torque excitation;
[0026] S3. Analyze the acquired vibration and noise data;
[0027] S4, selecting the optimal control strategy of the hybrid powertrain according to the optimal range curve of the hybrid powertrain fuel economy and the vibration and noise MAP;
[0028] S5. Perform iterative verification on the test vehicle based on the selected hybrid powertrain optimal control strategy.
[0029] Specifically, the present invention proposes a calibration strategy method that is more conducive to vehicle comfort while taking into account fuel economy for hybrid vehicles. The hybrid powertrain is both a vibration source and a noise source, simplifying the hybrid powertrain into an overall excitation source. The magnitude of the external excitation of the hybrid powertrain changes with the effective power output per unit time. The effective power P e The expression is Therefore, the influence of hybrid system control strategy on NVH can be further simplified as the effective torque T e and the matching control between the crankshaft speed n.
[0030] In the above step S1, the detection device includes a vibration sensor, which is arranged at the twelve o'clock position of the steering wheel in the test vehicle (when the steering wheel is in a completely upright state, the uppermost part is usually called the "twelve o'clock position") and the guide rail of the main driver's seat.
[0031] In the above step S1, the detection device further includes a noise sensor. The noise sensor is used to detect the noise near the driver's right ear and the noise near the left ear of the rear right seat passenger.
[0032] In the above step S2, in order to more comprehensively cover the working conditions of the hybrid powertrain system, a fixed effective torque T is used. ei, changing the crankshaft speed n of the hybrid powertrain at a fixed rate, thereby changing the hybrid powertrain excitation force, and obtaining the effective torque T ei The hybrid power matching strategy is studied by using the vibration and noise of key response points in the vehicle under excitation.
[0033] In the above step S2, as specifically shown in formula (1), a fixed effective torque T is used. e1 , increase the hybrid powertrain crankshaft speed n from n1 to n at a fixed time t m , and then the effective torque T of the hybrid powertrain is obtained ei Vibration and noise of key response points in the vehicle under excitation; fixed effective torque T e2 , and increase the hybrid powertrain crankshaft speed n from n2 to n at the same fixed time t m , and then the effective torque T of the hybrid powertrain is obtained e2 Vibration and noise of key response points in the vehicle under excitation; ... Fixed effective torque T em , at the same fixed time t, the hybrid powertrain crankshaft speed n is reduced from n m Pull up to n m , and then the effective torque T of the hybrid powertrain is obtained em Vibration and noise of key response points in the vehicle under excitation.
[0034]
[0035] In the above step S3, a relatively good point for vibration and noise and a key point to avoid are selected. The relatively good point for vibration and noise includes a position point where the acceleration noise sound pressure level in the test sample vehicle is controlled below a first set value and the vibration is controlled below a second set value. The key point to avoid includes a roaring point and a resonance point in the test sample vehicle.
[0036] In the above step S3, the first setting value is 60dB(A) and the second setting value is 0.02g.
[0037] In the above step S4, the optimal range curve of the hybrid powertrain fuel economy is sorted out, combined with the vibration and noise MAP, which is a data set reflecting the vibration and noise levels of the hybrid system under different working conditions, to select the optimal control strategy of the hybrid powertrain.
[0038] The hybrid vehicle NVH calibration method of the present invention has the following advantages:
[0039] 1. It can identify the vibration and noise problems of the whole vehicle earlier in the early calibration stage;
[0040] 2. It can better balance fuel economy and NVH performance and comfort, avoiding the early calibration that only considers fuel economy unilaterally;
[0041] 3. It can greatly reduce the adjustment and matching changes of the later suspension, transmission, intake and exhaust systems, greatly saving costs and shortening the project development cycle.
[0042] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.
Claims
1. A hybrid vehicle NVH calibration method, characterized in that: Includes steps: S1. Prepare a test vehicle and arrange vibration and noise detection devices in the test vehicle; S2, starting the hybrid powertrain of the test vehicle, changing the excitation force of the hybrid powertrain, and collecting the in-vehicle vibration and noise data of the test vehicle under the effective torque excitation; S3. Analyze the acquired vibration and noise data; S4, selecting the optimal control strategy of the hybrid powertrain according to the optimal range curve of the hybrid powertrain fuel economy and the vibration and noise MAP; S5. Perform iterative verification on the test vehicle based on the selected hybrid powertrain optimal control strategy.
2. The hybrid vehicle NVH calibration method according to claim 1, characterized in that: The detection device comprises a vibration sensor, which is arranged at the twelve o'clock position of the steering wheel in the test sample vehicle and at the guide rail of the main driver's seat.
3. The hybrid vehicle NVH calibration method according to claim 1, characterized in that: The detection device also includes a noise sensor, which is arranged next to the right ear of the driver of the test vehicle and next to the left ear of the rear right seat passenger.
4. The NVH calibration method for a hybrid vehicle according to any one of claims 1 to 3, characterized in that: In step S3, the advantages and key avoidance points of vibration noise are selected.
5. The hybrid vehicle NVH calibration method according to claim 4, characterized in that: The vibration noise advantages include a position point where the sound pressure level of the acceleration noise in the test sample vehicle is controlled below a first set value and the vibration is controlled below a second set value.
6. The hybrid vehicle NVH calibration method according to claim 5, characterized in that: The first setting value is 60dB(A), and the second setting value is 0.02g.
7. The hybrid vehicle NVH calibration method according to claim 4, characterized in that: The key avoidance points include the roaring points in the test vehicle.
8. The hybrid vehicle NVH calibration method according to claim 7, characterized in that: The key avoidance points also include resonance points within the test vehicle.
9. The NVH calibration method for a hybrid vehicle according to any one of claims 1 to 8, characterized in that: In step S2, a fixed effective torque T is used. ei , changing the crankshaft speed n of the hybrid powertrain at a fixed rate, thereby changing the hybrid powertrain excitation force, and obtaining the effective torque T ei The hybrid power matching strategy is studied by using the vibration and noise of key response points in the vehicle under excitation.
10. The hybrid vehicle NVH calibration method according to claim 9, characterized in that: In step S2, a fixed effective torque T is used. e1 , increase the hybrid powertrain crankshaft speed n from n1 to n at a fixed time t m , and then the effective torque T of the hybrid powertrain is obtained ei Vibration and noise of key response points in the vehicle under excitation; fixed effective torque T e2 , and increase the hybrid powertrain crankshaft speed n from n2 to n at the same fixed time t m , and then the effective torque T of the hybrid powertrain is obtained e2 Vibration and noise of key response points in the vehicle under excitation; ... Fixed effective torque T em , at the same fixed time t, the hybrid powertrain crankshaft speed n is reduced from n m Pull up to n m , and then the effective torque T of the hybrid powertrain is obtained em Vibration and noise of key response points in the vehicle under excitation.