Vehicle starting performance debugging method and system and vehicle

Abstract

The invention relates to the field of vehicle performance debugging, and particularly discloses a vehicle starting performance debugging method and system and a vehicle. Detecting a vehicle state and identifying a vehicle starting stage; collecting an acquisition signal of a chassis acceleration sensor in a vehicle starting stage, and recording the acquisition signal as a target signal; vehicle starting performance is judged according to the target signal; and if the starting performance of the vehicle is not qualified, the vehicle parameters are corrected according to a pre-configured correction strategy. Automatic debugging of the starting performance of the vehicle is achieved, the efficiency of debugging the starting performance of the vehicle and the consistency of evaluation results are improved, and real-time adjustment of vehicle parameters can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle performance debugging, and in particular to a vehicle starting performance debugging method and system, and a vehicle. Background Art

[0002] Heavy-duty commercial vehicles often have slow starting, insufficient starting power and uneven starting. This is generally due to the mismatch between the clutch engagement speed, depth, engine requested torque and engine torque change slope, resulting in slow starting, insufficient power and poor starting smoothness.

[0003] In order to improve the vehicle's starting performance, the vehicle is generally debugged to find the cause of the poor starting performance. However, the traditional starting performance debugging method mainly relies on the subjective feelings of the driving engineer and the calibration engineer's post-debugging data analysis. The subjective feelings mainly rely on the engineer's experience and cannot guarantee the consistency of the evaluation results. The engineer's data analysis after debugging cannot guarantee the speed of the starting debugging evaluation and cannot make real-time adjustments. Summary of the invention

[0004] To solve the above problems, the present invention provides a vehicle starting performance debugging method and system, and a vehicle, which realize automatic debugging of vehicle starting performance, improve the efficiency of vehicle starting performance debugging and the consistency of evaluation results, and realize real-time adjustment of vehicle parameters.

[0005] In a first aspect, the technical solution of the present invention provides a vehicle starting performance debugging method, comprising the following steps: Arrange acceleration sensors on the chassis; Detect vehicle status and identify vehicle starting stage; During the vehicle starting phase, the acquisition signal of the chassis acceleration sensor is collected and recorded as the target signal; Determine the vehicle's starting performance based on the target signal; If the vehicle's starting performance is unsatisfactory, the vehicle parameters are corrected according to the pre-configured correction strategy.

[0006] In an optional implementation, detecting the vehicle state and identifying the vehicle starting stage specifically includes: Get vehicle gear information through CAN line; When the vehicle is in the starting gear, the throttle opening is obtained through the CAN line; The timing starts from the time when the throttle opening is detected to be greater than 0, which is recorded as the starting point; Acquire the vehicle transmission speed and engine speed from the starting point; When the transmission speed and engine speed are synchronized, the timing ends and is recorded as the starting end point; The period from the starting point to the starting point is recorded as the starting stage.

[0007] In an optional embodiment, the method further comprises the following steps: Arrange an acceleration sensor at the bottom of the front axle; During the vehicle starting phase, the acquisition signal of the front axle acceleration sensor is collected and recorded as a reference signal; A road disturbance compensation filter is used to filter the target signal based on the reference signal.

[0008] In an optional implementation, judging the vehicle starting performance according to the target signal refers to judging the vehicle starting performance according to the filtered target signal.

[0009] In an optional implementation, judging the vehicle starting performance according to the target signal specifically includes: Obtain the time point when the acceleration slope in the forward direction is the largest from the target signal and record it as the reference point; Calculate the time from the starting point to the reference point; Determine whether the calculated duration is less than a preset duration threshold; If so, it is determined that the vehicle starts quickly and the quick start performance is qualified; Otherwise, the vehicle is judged to have slow start and unqualified quick start performance.

[0010] In an optional implementation, judging the vehicle starting performance according to the target signal specifically includes: Obtain the vibration amplitude of the acceleration in the forward direction within the target frequency range from the starting point to a preset time thereafter; Determining whether the acquired vibration amplitude is less than a preset amplitude threshold; If so, the vehicle's ride performance is determined to be qualified; Otherwise, the vehicle's ride performance is judged to be unqualified.

[0011] In an optional implementation, the vehicle parameters are corrected according to a preconfigured correction strategy, specifically including: The preset parameter table of the vehicle is corrected according to a pre-configured correction strategy, wherein the preset parameter table includes a clutch engagement depth table, a clutch engagement speed table, an engine request torque table, and an engine torque change rate table.

[0012] In a second aspect, the technical solution of the present invention provides a vehicle starting performance debugging system, which is implemented based on any of the above methods, and the system includes: Starting phase identification module: detects vehicle status and identifies the vehicle starting phase; Target signal collection module: collects the acquisition signal of the chassis acceleration sensor during the vehicle starting stage and records it as the target signal; Starting performance judgment module: judges the vehicle starting performance according to the target signal; Vehicle parameter correction module: If the vehicle's starting performance is unqualified, the vehicle parameters are corrected according to the pre-configured correction strategy.

[0013] In an optional embodiment, it also includes: Reference signal collection module: collects the acquisition signal of the front axle acceleration sensor during the vehicle starting phase and records it as a reference signal; Target signal filtering module: Uses a road disturbance compensation filter to filter the target signal based on the reference signal.

[0014] In a third aspect, the technical solution of the present invention provides a vehicle equipped with any of the vehicle starting performance debugging systems described above.

[0015] Compared with the prior art, the present invention provides a vehicle starting performance debugging method, system and vehicle, which have the following beneficial effects: an acceleration sensor is arranged on the vehicle chassis, and the vehicle state is detected in real time, the chassis acceleration information in the starting stage is recorded, and then the vehicle starting performance is automatically judged according to the recorded chassis acceleration parameters. The present invention realizes automatic debugging of the vehicle starting performance, improves the efficiency of vehicle starting performance debugging and the consistency of evaluation results, and can realize real-time adjustment of vehicle parameters. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The present invention is a flow chart of a vehicle starting performance debugging method provided by an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the architecture of a specific embodiment of a vehicle starting performance debugging method provided by the present invention.

[0018] Figure 3 It is a flow chart of a specific embodiment of a vehicle starting performance debugging method provided by the present invention.

[0019] Figure 4 The present invention provides a schematic block diagram of a vehicle starting performance debugging system. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] Figure 1 The flowchart of a vehicle starting performance debugging method provided by an embodiment of the present invention is shown in FIG. According to different requirements, the order of the steps in the flowchart can be changed, and some steps can be omitted.

[0023] like Figure 1 As shown, the method includes the following steps.

[0024] S1, arrange the acceleration sensor on the chassis.

[0025] In this embodiment, the acceleration in the forward direction is collected by an acceleration sensor arranged on the chassis.

[0026] S2, detecting the vehicle status and identifying the vehicle starting stage.

[0027] This embodiment obtains vehicle status information through the CAN line to identify the starting stage of the vehicle.

[0028] S3, collecting the acquisition signal of the chassis acceleration sensor during the vehicle starting stage, and recording it as the target signal.

[0029] S4, judging the vehicle starting performance according to the target signal.

[0030] This embodiment uses the acceleration in the forward direction of the starting phase as a basis for judging the starting performance of the vehicle. The unified evaluation standard of this embodiment is an objective evaluation standard integrating CAN line data and acceleration sensor to ensure the consistency of the calibration adjustment effect.

[0031] S5: If the vehicle starting performance is unqualified, the vehicle parameters are corrected according to a pre-configured correction strategy.

[0032] During the debugging process, this embodiment corrects vehicle parameters in real time according to the vehicle starting performance test results, realizes a real-time feedback and debugging mechanism, can monitor the starting performance in real time during vehicle driving, and make instant adjustments as needed to achieve continuous optimization of the starting performance.

[0033] Figure 2 This is a schematic diagram of the architecture of a vehicle starting performance debugging method of a specific embodiment. CAN line data is collected to judge the starting process. The forward deceleration and longitudinal acceleration of the starting process are collected through the vehicle acceleration sensor (including the chassis acceleration sensor and the front axle acceleration sensor). The forward acceleration is filtered using the longitudinal acceleration, and the forward acceleration after filtering is used to evaluate the starting performance, including smoothness and rapidity. Afterwards, the preset table is corrected when the starting performance is unqualified, and the vehicle can be calibrated for rapid and smooth starting in combination with subjective evaluation.

[0034] Figure 3 FIG. 1 is a flow chart of a vehicle starting performance debugging method according to a specific embodiment. Figure 3 As shown, this specific embodiment includes the following steps.

[0035] SS1, acceleration sensors are arranged on the chassis and the bottom of the front axle.

[0036] In this embodiment, the chassis acceleration sensor collects the acceleration in the forward direction, the sensor at the bottom of the front axle collects the longitudinal acceleration, and the longitudinal acceleration is used to filter the acceleration in the forward direction.

[0037] SS2, collects vehicle parameters through the CAN line to identify the vehicle's starting stage.

[0038] SS2.1, obtain vehicle gear information through CAN line.

[0039] SS2.2, when the vehicle is in the starting gear, the throttle opening is obtained through the CAN line.

[0040] SS2.3, start timing from the time when the throttle opening is detected to be greater than 0, which is recorded as the starting point.

[0041] SS2.4, obtain the vehicle transmission speed and engine speed from the starting point.

[0042] SS2.5, when the transmission speed and engine speed are synchronized, the timing ends and is recorded as the starting end point.

[0043] SS2.6, the starting phase is from the starting point to the starting point.

[0044] This embodiment defines the starting process as the stage from when the accelerator is pressed to when the input shaft speed is synchronized with the engine speed when the vehicle is stationary. The drive drivability evaluation software of AVL can be used to identify the starting process. First, the gear position, throttle, input shaft speed, engine speed and other data are read from the CAN bus. When the software reads that the vehicle is in the starting gear, the throttle data is monitored. When the throttle opening is greater than 0, it is determined to start the start, and the input shaft speed and engine speed are monitored at the same time. When the engine speed and input shaft speed are synchronized, the software stops recording. During this process, the acceleration data recorded by the software is used to evaluate the starting performance.

[0045] SS3, during the vehicle starting phase, collects the acquisition signal of the chassis acceleration sensor, which is recorded as the target signal, and collects the acquisition signal of the front axle acceleration sensor, which is recorded as the reference signal.

[0046] SS4, uses a road disturbance compensation filter to filter the target signal based on the reference signal.

[0047] During vehicle driving, the road surface is bumpy and uneven, which affects the longitudinal and lateral acceleration signals. This includes single obstacles as well as high-speed signal noise. An additional Z-axis accelerometer needs to be installed on the left front wheel bracket to achieve road disturbance compensation.

[0048] The road disturbance compensation filter is an adaptive band-stop filter. The longitudinal acceleration (original signal) and the vertical acceleration (reference signal) at the wheel carrier are transformed into the frequency domain by means of a discrete Fourier transform (DFT). In the frequency domain, all values ​​of the original signal are eliminated when the corresponding value of the DFT of the reference signal exceeds a defined threshold. The compensation signal is the modified DFT re-transformed into the time domain (inverse DFT or IDFT). As a result, all frequencies with significantly high amplitudes in the reference signal are eliminated in the original signal. Based on the vehicle's wheelbase and speed, a time-shifted virtual sensor signal is generated at the left rear wheel to further eliminate disturbances from the rear axle.

[0049] SS5, determines the vehicle starting performance based on the filtered target signal.

[0050] The starting performance evaluation of this embodiment includes evaluation of both quick start and smooth start.

[0051] SS5.1, obtain the time point when the acceleration slope in the forward direction is the largest from the target signal and record it as the reference point.

[0052] SS5.2, calculate the time from the starting point to the reference point.

[0053] SS5.3, determine whether the calculated duration is less than a preset duration threshold.

[0054] SS5.4, if yes, the vehicle is judged to have a fast start and the fast start performance is qualified.

[0055] SS5.5, otherwise, the vehicle is judged to have slow start and unqualified quick start performance.

[0056] This embodiment evaluates by measuring the time from when the accelerator is depressed to when the acceleration slope in the vehicle's forward direction reaches its maximum. The longer the time, the slower the start.

[0057] SS5.6, obtains the vibration amplitude of the acceleration in the forward direction within the target frequency range from the starting point to the preset time thereafter.

[0058] SS5.7, determine whether the acquired vibration amplitude is less than a preset amplitude threshold.

[0059] SS5.8, if yes, the vehicle's ride performance is considered qualified.

[0060] SS5.9, otherwise, the vehicle's ride performance is judged to be unqualified.

[0061] For example, the vibration amplitude of the chassis acceleration within the frequency range of 2 Hz to 50 Hz in the vehicle's forward direction within three seconds after the accelerator is depressed is analyzed. The larger the amplitude, the worse the smoothness.

[0062] SS6, if the vehicle's starting performance is unsatisfactory, the vehicle parameters are corrected according to the pre-configured correction strategy.

[0063] The preset parameter table of the vehicle is corrected according to a pre-configured correction strategy, wherein the preset parameter table includes a clutch engagement depth table, a clutch engagement speed table, an engine request torque table, and an engine torque change rate table.

[0064] In this embodiment, if the starting performance does not meet the standard, the clutch engagement speed, depth, engine torque request and its change slope and other parameters are adjusted according to the preset logic to optimize the starting performance.

[0065] For example, when the vehicle starts slowly, the clutch engagement speed is increased, the clutch engagement depth is deepened, and the engine torque request and change slope are increased. When the engine speed / input shaft speed fluctuates greatly, or the clutch engages too quickly and too deeply, the torque request is too large, causing the clutch to engage and release violently, the vehicle acceleration fluctuates greatly, and the smoothness is poor, it is necessary to slow down the clutch engagement speed, reduce the clutch engagement depth, and reduce the engine torque request. These calibration quantities are adjusted dynamically continuously to achieve a balance between rapidity, smoothness, and power.

[0066] In an optional implementation, after debugging the vehicle in combination with objective evaluation standards, the subjective driving experience of the drivability evaluation engineer is introduced as the final verification to ensure that the vehicle can achieve a quick and smooth start and to ensure the consistency of the calibration effect.

[0067] An embodiment of a vehicle starting performance debugging method is described in detail above. Based on the vehicle starting performance debugging method described in the above embodiment, an embodiment of the present invention further provides a vehicle starting performance debugging system corresponding to the method.

[0068] Figure 4 The present invention provides a schematic block diagram of the structure of a vehicle starting performance debugging system. The vehicle starting performance debugging system can be divided into multiple functional modules according to the functions it performs. The module referred to in the present invention refers to a series of computer program segments that can be executed by at least one processor and can complete fixed functions, which are stored in a memory.

[0069] Starting phase identification module: detects vehicle status and identifies the vehicle starting phase.

[0070] Target signal collection module: collects the acquisition signal of the chassis acceleration sensor during the vehicle starting phase and records it as the target signal.

[0071] Starting performance judgment module: judges the vehicle starting performance according to the target signal.

[0072] Vehicle parameter correction module: If the vehicle's starting performance is unqualified, the vehicle parameters are corrected according to the pre-configured correction strategy.

[0073] In an optional embodiment, the system further includes a reference signal collection module and a target signal filtering module.

[0074] Reference signal collection module: collects the acquisition signal of the front axle acceleration sensor during the vehicle starting phase and records it as a reference signal.

[0075] Target signal filtering module: Uses a road disturbance compensation filter to filter the target signal based on the reference signal.

[0076] The vehicle starting performance debugging system of this embodiment is used to implement the aforementioned vehicle starting performance debugging method. Therefore, the specific implementation method of the system can be seen in the embodiment part of the vehicle starting performance debugging method in the previous text. Therefore, its specific implementation method can refer to the description of the corresponding embodiments of each part, which will not be introduced in detail here.

[0077] In addition, since the vehicle starting performance debugging system of the present embodiment is used to implement the aforementioned vehicle starting performance debugging method, its function corresponds to that of the aforementioned method, and will not be described in detail here.

[0078] This embodiment provides a vehicle, which is equipped with the vehicle starting performance debugging system of the above embodiment.

[0079] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by a person skilled in the art, as well as several improvements and modifications made without departing from the principle of the present invention, should fall within the protection scope of the present invention.

Claims

1. A vehicle starting performance debugging method, characterized in that: The following steps are involved: Arrange acceleration sensors on the chassis; Detect vehicle status and identify vehicle starting stage; During the vehicle starting phase, the acquisition signal of the chassis acceleration sensor is collected and recorded as the target signal; Determine the vehicle's starting performance based on the target signal; If the vehicle's starting performance is unsatisfactory, the vehicle parameters are corrected according to the pre-configured correction strategy.

2. The vehicle starting performance debugging method according to claim 1, characterized in that: Detect vehicle status and identify vehicle starting phase, including: Get vehicle gear information through CAN line; When the vehicle is in the starting gear, the throttle opening is obtained through the CAN line; The timing starts from the time when the throttle opening is detected to be greater than 0, which is recorded as the starting point; Acquire the vehicle transmission speed and engine speed from the starting point; When the transmission speed and engine speed are synchronized, the timing ends and is recorded as the starting end point; The period from the starting point to the starting point is recorded as the starting stage.

3. The vehicle starting performance debugging method according to claim 1 or 2, characterized in that: The method further comprises the following steps: Arrange an acceleration sensor at the bottom of the front axle; During the vehicle starting phase, the acquisition signal of the front axle acceleration sensor is collected and recorded as a reference signal; A road disturbance compensation filter is used to filter the target signal based on the reference signal.

4. The vehicle starting performance debugging method according to claim 3, characterized in that: Judging the vehicle starting performance according to the target signal refers to judging the vehicle starting performance according to the filtered target signal.

5. The vehicle starting performance debugging method according to claim 1 or 2, characterized in that: The vehicle starting performance is judged according to the target signal, including: Obtain the time point when the acceleration slope in the forward direction is the largest from the target signal and record it as the reference point; Calculate the time from the starting point to the reference point; Determine whether the calculated duration is less than a preset duration threshold; If so, it is determined that the vehicle starts quickly and the quick start performance is qualified; Otherwise, the vehicle is judged to have slow start and unqualified quick start performance.

6. The vehicle starting performance debugging method according to claim 5, characterized in that: Judging the vehicle starting performance according to the target signal includes: Obtain the vibration amplitude of the acceleration in the forward direction within the target frequency range from the starting point to a preset time thereafter; Determining whether the acquired vibration amplitude is less than a preset amplitude threshold; If so, the vehicle's ride performance is determined to be qualified; Otherwise, the vehicle's ride performance is judged to be unqualified.

7. The vehicle starting performance debugging method according to claim 6, characterized in that: The vehicle parameters are corrected according to the pre-configured correction strategy, including: The preset parameter table of the vehicle is corrected according to a pre-configured correction strategy, wherein the preset parameter table includes a clutch engagement depth table, a clutch engagement speed table, an engine request torque table, and an engine torque change rate table.

8. A vehicle starting performance debugging system, characterized in that: The method according to any one of claims 1 to 7 is implemented, the system comprising: Starting phase identification module: detects vehicle status and identifies the vehicle starting phase; Target signal collection module: collects the acquisition signal of the chassis acceleration sensor during the vehicle starting stage and records it as the target signal; Starting performance judgment module: judges the vehicle starting performance according to the target signal; Vehicle parameter correction module: If the vehicle's starting performance is unqualified, the vehicle parameters are corrected according to the pre-configured correction strategy.

9. The vehicle starting performance debugging system according to claim 8, characterized in that: Also includes, Reference signal collection module: collects the acquisition signal of the front axle acceleration sensor during the vehicle starting phase and records it as a reference signal; Target signal filtering module: Uses a road disturbance compensation filter to filter the target signal based on the reference signal.

10. A vehicle, characterized in that: The vehicle starting performance debugging system according to claim 8 or 9 is provided.

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