A vehicle starting performance debugging method and system, and a vehicle

Abstract

The application relates to the field of vehicle performance debugging, and particularly discloses a vehicle starting performance debugging method and system, a vehicle, and a vehicle, wherein an acceleration sensor is arranged on a chassis; the state of the vehicle is detected to identify a vehicle starting stage; the collection signal of the chassis acceleration sensor is collected in the vehicle starting stage and recorded as a target signal; the starting performance of the vehicle is judged according to the target signal; and if the starting performance of the vehicle is unqualified, the vehicle parameters are corrected according to a pre-configured correction strategy. The application realizes the automatic debugging of the starting performance of the vehicle, improves the efficiency of the starting performance debugging of the vehicle and the consistency of the evaluation results, and can realize the real-time adjustment of the vehicle parameters.

Description

TECHNICAL FIELD

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

[0002] Heavy commercial vehicles often have slow starting, insufficient starting power and uneven starting. Generally, slow starting, insufficient power and poor starting smoothness are caused by mismatching of clutch engagement speed, depth, engine requested torque and engine torque change slope.

[0003] To improve vehicle starting performance, the vehicle is generally subjected to starting debugging to find the cause of poor starting performance. However, the traditional starting performance debugging method mainly relies on the subjective feeling of the driving engineer and the data analysis of the calibration engineer after debugging. The subjective feeling mainly relies on the experience of the engineer, which cannot guarantee the consistency of the evaluation results. The data analysis by the engineer after debugging cannot guarantee the rapidity of the starting debugging evaluation, and real-time adjustment cannot be made. SUMMARY

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

[0005] In a first aspect, the technical solution of the present application provides a vehicle starting performance debugging method, comprising the following steps:

[0006] Arranging an acceleration sensor on the chassis;

[0007] Detecting the vehicle state and identifying the vehicle starting stage;

[0008] Collecting the acquisition signal of the chassis acceleration sensor in the vehicle starting stage, denoted as the target signal;

[0009] Judging the vehicle starting performance according to the target signal;

[0010] If the vehicle starting performance is unqualified, modifying the vehicle parameters according to the pre-configured correction strategy.

[0011] In an optional embodiment, detecting the vehicle state and identifying the vehicle starting stage specifically comprises:

[0012] Obtaining the gear information of the vehicle through the CAN line;

[0013] When the vehicle is in the starting gear, obtaining the throttle opening degree through the CAN line;

[0014] Timing from the moment when the throttle opening degree is greater than 0, denoted as the starting starting point;

[0015] acquiring the vehicle gearbox speed and the engine speed from the start point;

[0016] ending the timing when the gearbox speed and the engine speed are synchronized, recorded as the end point of the start;

[0017] the start phase is recorded from the start point to the end point of the start.

[0018] In an optional embodiment, the method further comprises the following steps:

[0019] arranging an acceleration sensor at the bottom of the front axle;

[0020] collecting the acquisition signal of the front axle acceleration sensor in the start phase of the vehicle, recorded as the reference signal;

[0021] filtering the target signal based on the reference signal using a road disturbance compensation filter.

[0022] In an optional embodiment, judging the start performance of the vehicle according to the target signal refers to judging the start performance of the vehicle according to the filtered target signal.

[0023] In an optional embodiment, judging the start performance of the vehicle according to the target signal specifically comprises:

[0024] acquiring the time point when the forward direction acceleration slope is maximum from the target signal, recorded as the reference point;

[0025] calculating the duration from the start point to the reference point;

[0026] judging whether the calculated duration is less than a preset duration threshold;

[0027] if yes, determining that the vehicle starts fast and the start fast performance is qualified;

[0028] otherwise, determining that the vehicle starts slow and the start fast performance is unqualified.

[0029] In an optional embodiment, judging the start performance of the vehicle according to the target signal specifically further comprises:

[0030] acquiring the vibration amplitude of the forward direction acceleration in the target frequency range within a preset duration after the start point;

[0031] judging whether the acquired vibration amplitude is less than a preset amplitude threshold;

[0032] if yes, determining that the vehicle smooth performance is qualified;

[0033] otherwise, determining that the vehicle smooth performance is unqualified.

[0034] In an optional embodiment, the vehicle parameters are modified according to a pre-configured modification strategy, specifically including:

[0035] The pre-configured modification strategy is used to modify a preset parameter table of the vehicle, wherein the preset parameter table includes a clutch engagement depth table, a clutch engagement speed table, an engine requested torque table, and an engine torque change rate table.

[0036] In a second aspect, the technical solution of the present application provides a vehicle starting performance debugging system, which is based on any of the above methods and includes,

[0037] A starting phase recognition module is configured to detect the vehicle state and recognize the vehicle starting phase.

[0038] A target signal collection module is configured to collect the acquisition signal of the chassis acceleration sensor during the vehicle starting phase, which is recorded as a target signal.

[0039] A starting performance judgment module is configured to judge the vehicle starting performance according to the target signal.

[0040] A vehicle parameter modification module is configured to modify the vehicle parameters according to a pre-configured modification strategy if the vehicle starting performance is unqualified.

[0041] In an optional embodiment, the system further includes,

[0042] A reference signal collection module is configured to collect the acquisition signal of the front axle acceleration sensor during the vehicle starting phase, which is recorded as a reference signal.

[0043] A target signal filtering module is configured to filter the target signal based on the reference signal using a road disturbance compensation filter.

[0044] In a third aspect, the technical solution of the present application provides a vehicle configured with any of the above vehicle starting performance debugging systems.

[0045] The vehicle starting performance debugging method and system, and the vehicle provided by the present application have the following advantages over the prior art: an acceleration sensor is arranged on the vehicle chassis to detect the vehicle state in real time and record the chassis acceleration information during the starting phase, and then the vehicle starting performance is automatically judged according to the recorded chassis acceleration parameters. The present application realizes the automatic debugging of the vehicle starting performance, improves the efficiency of the vehicle starting performance debugging and the consistency of the evaluation results, and can realize the real-time adjustment of the vehicle parameters. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to make the technical scheme of the present application or prior art clearer, the accompanying drawings needed in the description of the embodiments or prior art will be briefly described. Obviously, the accompanying drawings in the description are only some embodiments of the present application, and for those ordinarily skilled in the art, other drawings can be obtained based on these accompanying drawings without creative effort.

[0047] Figure 1 is a flowchart of a vehicle starting performance debugging method provided by an embodiment of the present application.

[0048] Figure 2 is an architecture diagram of a specific embodiment of a vehicle starting performance debugging method provided by the present application.

[0049] Figure 3 is a flowchart of a specific embodiment of a vehicle starting performance debugging method provided by the present application.

[0050] Figure 4 is a structure schematic block diagram of a vehicle starting performance debugging system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make those skilled in the art better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those ordinarily skilled in the art without creative effort fall within the scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0053] Figure 1 is a flowchart of a vehicle starting performance debugging method provided by an embodiment of the present application. According to different needs, the order of steps in the flowchart can be changed, and some can be omitted.

[0054] As shown in Figure 1 , the method comprises the following steps.

[0055] S1, arranging an acceleration sensor on a chassis.

[0056] In this embodiment, the acceleration in the forward direction is collected by the acceleration sensor arranged on the chassis.

[0057] S2, detecting the vehicle state to identify the vehicle starting stage.

[0058] The embodiment obtains the vehicle state information through the CAN line to identify the vehicle starting stage.

[0059] S3, collecting the acquisition signal of the chassis acceleration sensor in the vehicle starting stage, which is recorded as the target signal.

[0060] S4, judging the vehicle starting performance according to the target signal.

[0061] The embodiment judges the vehicle starting performance according to the forward direction acceleration in the starting stage. The unified evaluation standard of the embodiment is the objective evaluation standard integrating the CAN line data and the acceleration sensor, which ensures the consistency of the calibration and adjustment effect.

[0062] S5, if the vehicle starting performance is unqualified, modifying the vehicle parameters according to the pre-configured correction strategy.

[0063] In the debugging process, the embodiment modifies the vehicle parameters in real time according to the vehicle starting performance test results, realizes the real-time feedback and debugging mechanism, can monitor the starting performance in real time during the vehicle driving process, and adjusts in real time as needed to realize the continuous optimization of the starting performance.

[0064] Figure 2 is a vehicle starting performance debugging method architecture schematic diagram of a specific embodiment, which collects the CAN line data to judge the starting process, collects the forward direction deceleration and the longitudinal acceleration of the starting process through the vehicle acceleration sensor (including the chassis acceleration sensor and the front axle acceleration sensor), uses the longitudinal acceleration to filter the forward direction acceleration, uses the filtered forward direction acceleration to evaluate the starting performance, including the smoothness and rapidity evaluation. Then, when the starting performance is unqualified, the preset table is modified, and the subjective evaluation can be combined to realize the rapid and smooth starting calibration of the vehicle.

[0065] Figure 3 is a vehicle starting performance debugging method flowchart of a specific embodiment, as shown in Figure 3 The specific embodiment includes the following steps.

[0066] SS1, arranging the acceleration sensor at the bottom of the chassis and the front axle.

[0067] The embodiment collects the forward direction acceleration through the chassis acceleration sensor and collects the longitudinal acceleration through the front axle bottom sensor, and uses the longitudinal acceleration to filter the forward direction acceleration.

[0068] SS2, collecting the vehicle parameters through the CAN line to identify the vehicle starting stage.

[0069] SS2.1, Obtain the vehicle gear information through the CAN line.

[0070] SS2.2, When the vehicle is in the starting gear, obtain the accelerator opening degree through the CAN line.

[0071] SS2.3, Start timing from the detection of the accelerator opening degree greater than 0, recorded as the starting point.

[0072] SS2.4, Obtain the vehicle gearbox speed and engine speed from the starting point.

[0073] SS2.5, End timing when the gearbox speed and engine speed are synchronized, recorded as the end point.

[0074] SS2.6, From the starting point to the end point, record the starting phase.

[0075] This embodiment defines the starting process as the stage from the accelerator being pressed to the input shaft speed and engine speed being synchronized when the vehicle is stationary. The starting process can be identified using the AVL drive drivability evaluation software. First, read the gear, accelerator, input shaft speed, engine speed and other data from the CAN bus. When the software reads that the vehicle is in the starting gear, monitor the accelerator data, and when the accelerator opening degree > 0, determine that the starting has begun, while monitoring the input shaft speed and engine speed, when the engine speed and input shaft speed are synchronized, the software ends recording. During this process, the software records the acceleration data to evaluate the starting performance.

[0076] SS3, Collect the acquisition signal of the chassis acceleration sensor during the vehicle starting phase, recorded as the target signal, and collect the acquisition signal of the front axle acceleration sensor, recorded as the reference signal.

[0077] SS4, Use the road disturbance compensation filter to filter the target signal based on the reference signal.

[0078] During vehicle travel, the road surface is 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.

[0079] The road disturbance compensation filter is an adaptive band-stop filter. The longitudinal acceleration at the wheel carrier (original signal) and the vertical acceleration (reference signal) 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 values of the DFT of the reference signal exceed a defined threshold. The compensation signal is the re-transform of the modified DFT into the time domain (inverse DFT or IDFT). Thus, all frequencies with a significantly high amplitude in the reference signal are eliminated in the original signal. Based on the wheel base and the vehicle speed, a time-shifted virtual sensor signal is generated at the rear left wheel to further eliminate the disturbance of the rear axle.

[0080] SS5. judging the vehicle start-up performance according to the filtered target signal.

[0081] The start-up performance evaluation of the embodiment includes evaluation of start-up rapidity and smoothness.

[0082] SS5.1. obtaining the time point at which the acceleration slope in the forward direction is maximum from the target signal, denoted as the reference point.

[0083] SS5.2. calculating the time length from the start-up starting point to the reference point.

[0084] SS5.3. judging whether the calculated time length is less than a preset time length threshold.

[0085] SS5.4. if yes, determining that the vehicle starts up fast and the start-up rapidity performance is qualified.

[0086] SS5.5. otherwise, determining that the vehicle starts up slowly and the start-up rapidity performance is unqualified.

[0087] The embodiment evaluates by measuring the time from the accelerator pedal being depressed to the time at which the acceleration slope in the forward direction is maximum, and the longer the time, the slower the start-up.

[0088] SS5.6. obtaining the vibration amplitude of the acceleration in the forward direction in the target frequency range within a preset time length after the start-up starting point.

[0089] SS5.7. judging whether the obtained vibration amplitude is less than a preset amplitude threshold.

[0090] SS5.8. if yes, determining that the vehicle smoothness performance is qualified.

[0091] SS5.9. otherwise, determining that the vehicle smoothness performance is unqualified.

[0092] For example, the vibration amplitude of the chassis acceleration in the frequency range of 2 Hz to 50 Hz in the forward direction of the vehicle within three seconds after the accelerator pedal is depressed is analyzed, and the greater the amplitude, the worse the smoothness.

[0093] SS6, if the vehicle starting performance is unqualified, modifying the vehicle parameters according to the pre-configured correction strategy.

[0094] According to the pre-configured correction strategy, the preset parameter table of the vehicle is modified, 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.

[0095] In the embodiment, if the starting performance is not up to standard, the clutch engagement speed, depth, engine request torque and change slope are adjusted according to the preset logic to optimize the starting performance.

[0096] For example, when the vehicle starts slowly, the clutch engagement speed is increased, the clutch engagement depth is deepened, and the engine request torque and the change slope are increased. When the engine speed / input shaft speed fluctuates greatly, or the clutch is engaged too fast and too deep, the torque request is too large, the clutch is engaged and disengaged suddenly, the vehicle acceleration fluctuates greatly, and the smoothness is poor, the clutch engagement speed needs to be slowed down, the clutch engagement depth needs to be reduced, and the engine request torque needs to be reduced. These calibration quantities are dynamically adjusted to balance the rapidity, smoothness and power.

[0097] In an optional embodiment, after the vehicle is debugged in combination with the objective evaluation standard, the subjective driving experience of the driving evaluation engineer is introduced as the final verification to ensure that the vehicle realizes rapid and smooth starting and guarantees the consistency of the calibration effect.

[0098] The above describes in detail an embodiment of a vehicle starting performance debugging method, and based on the vehicle starting performance debugging method described in the above embodiment, the embodiment of the present application further provides a vehicle starting performance debugging system corresponding to the method.

[0099] Figure 4 is a structural schematic block diagram of a vehicle starting performance debugging system provided by the embodiment of the present application. The vehicle starting performance debugging system can be divided into multiple functional modules according to the functions performed by the vehicle starting performance debugging system. The module referred to in the present application refers to a series of computer program segments capable of being executed by at least one processor and capable of completing a fixed function, which are stored in a memory.

[0100] The starting stage recognition module detects the vehicle state and recognizes the starting stage of the vehicle.

[0101] The target signal collection module collects the acquisition signal of the chassis acceleration sensor in the vehicle starting stage, which is recorded as a target signal.

[0102] The starting performance judgment module judges the vehicle starting performance according to the target signal.

[0103] Vehicle parameter correction module: if the vehicle starting performance is unqualified, the vehicle parameters are corrected according to the pre-configured correction strategy.

[0104] In an optional embodiment, the system further comprises a reference signal collection module and a target signal filtering module.

[0105] The reference signal collection module collects the acquisition signal of the front axle acceleration sensor during the vehicle starting stage, which is recorded as the reference signal.

[0106] The target signal filtering module filters the target signal based on the reference signal using a road disturbance compensation filter.

[0107] The vehicle starting performance debugging system of the embodiment is used to implement the vehicle starting performance debugging method described above, and thus the specific embodiments in the system can refer to the embodiment part of the vehicle starting performance debugging method described above. Therefore, the specific embodiments can refer to the description of the corresponding embodiment part, and will not be introduced here.

[0108] In addition, since the vehicle starting performance debugging system of the embodiment is used to implement the vehicle starting performance debugging method described above, its role corresponds to the role of the above method, and thus will not be described here.

[0109] The embodiment provides a vehicle, which is configured with the vehicle starting performance debugging system of the above embodiment.

[0110] The above disclosure is only the preferred embodiment of the present application, but the present application is not limited to this. Any non-creative changes and several improvements and refinements made by those skilled in the art without departing from the principles of the present application should fall within the scope of protection of the present application.

Claims

1. A method of tuning vehicle launch performance, characterized by, The method comprises the following steps: arranging an acceleration sensor on the chassis; detecting the vehicle state to identify the vehicle starting stage; collecting the acquisition signal of the chassis acceleration sensor in the vehicle starting stage as a target signal; judging the vehicle starting performance according to the target signal, which comprises: obtaining the vibration amplitude of the forward direction acceleration in the target frequency range from the starting point to a preset time length thereafter; determining whether the obtained vibration amplitude is less than a preset amplitude threshold; if yes, determining that the vehicle smooth performance is qualified; otherwise, determining that the vehicle smooth performance is unqualified; if the vehicle starting performance is unqualified, modifying the vehicle parameters according to a pre-configured correction strategy.

2. The vehicle launch performance tuning method according to claim 1, characterized by, The detection of the vehicle state to identify the vehicle starting stage specifically comprises: obtaining the vehicle gear information through the CAN line; when the vehicle is in the starting gear, obtaining the throttle opening through the CAN line; starting timing from the detection that the throttle opening is greater than 0, which is recorded as the starting point; obtaining the vehicle gearbox speed and engine speed from the starting point; ending timing when the gearbox speed and engine speed are synchronized, which is recorded as the starting end; the period from the starting point to the starting end is recorded as the starting stage.

3. The vehicle launch performance tuning method according to claim 1 or 2, characterized by, The method further comprises the following steps: arranging an acceleration sensor on the front axle; collecting the acquisition signal of the front axle acceleration sensor in the vehicle starting stage as a reference signal; filtering the target signal based on the reference signal using a road disturbance compensation filter.

4. The vehicle launch performance tuning method according to claim 3, characterized by, The judgment of the vehicle starting performance according to the target signal refers to the judgment of the vehicle starting performance based on the filtered target signal.

5. The vehicle launch performance tuning method according to claim 1 or 2, characterized by, The judgment of the vehicle starting performance according to the target signal specifically comprises: obtaining the time point when the forward direction acceleration slope is maximum from the target signal, which is recorded as the reference point; calculating the time length between the starting point and the reference point; determining whether the calculated time length is less than a preset time length threshold; if yes, determining that the vehicle starts quickly and the starting fast performance is qualified; otherwise, determining that the vehicle starts slowly and the starting fast performance is unqualified.

6. The vehicle launch performance tuning method according to claim 1, characterized by, The modification of the vehicle parameters according to the pre-configured correction strategy specifically comprises: modifying the preset parameter table of the vehicle according to the pre-configured correction strategy, wherein the preset parameter table comprises a clutch engagement depth table, a clutch engagement speed table, an engine requested torque table, and an engine torque change rate table.

7. A vehicle launch performance tuning system, characterized by, The system is realized based on the method of any one of claims 1-6, and comprises, a starting stage identification module that detects the vehicle state to identify the vehicle starting stage; a target signal collection module that collects the acquisition signal of the chassis acceleration sensor in the vehicle starting stage as a target signal; a starting performance judgment module that judges the vehicle starting performance according to the target signal, which comprises: obtaining the vibration amplitude of the forward direction acceleration in the target frequency range from the starting point to a preset time length thereafter; determining whether the obtained vibration amplitude is less than a preset amplitude threshold; if yes, determining that the vehicle smooth performance is qualified; otherwise, determining that the vehicle smooth performance is unqualified; a vehicle parameter modification module that modifies the vehicle parameters according to a pre-configured correction strategy if the vehicle starting performance is unqualified.

8. The vehicle launch performance tuning system of claim 7, wherein, Further comprising, a reference signal collection module that collects the acquisition signal of the front axle acceleration sensor in the vehicle starting stage as a reference signal; Target signal filtering module: filter the target signal based on the reference signal using a road disturbance compensation filter.

9. A vehicle characterized by comprising: The vehicle starting performance debugging system of claim 7 or 8 is configured.

Images