Commercial vehicle automatic gear shifting gearbox gear shifting control method and system

Abstract

The invention provides a shift control method and system for an automatic shift gearbox of a commercial vehicle, and the method comprises the steps: obtaining a first operation state of a target vehicle, and determining a first upshift and downshift triggering rotation speed of the target vehicle in the first operation state based on the first operation state of the target vehicle; the hundred kilometer work and the first operation state gear of the target vehicle in the first operation state are determined according to the vehicle speed of the target vehicle in the first operation state, and whether the first operation state gear is corrected or not is judged according to the hundred kilometer work of the first operation state; after the first running state gear is corrected, the first up-and-down gear triggering rotating speed is corrected to be the second up-and-down gear triggering rotating speed; and obtaining a lifting gear state according to the second lifting gear triggering rotating speed and the rotating speed of the target gear input shaft in the second operation state. Based on the method, the invention further provides a shifting control system for the automatic shifting gearbox of the commercial vehicle. According to the method, unreasonable gear shifting is reduced under the working condition that the vehicle runs at a constant speed or slows down under the small accelerator opening degree.

Description

Technical Field

[0001] The present invention belongs to the technical field of commercial vehicle shift control, and in particular relates to a commercial vehicle automatic shift transmission gearbox shift control method and system. Background Art

[0002] More than half of commercial vehicles currently use automatic transmissions, which automatically select the appropriate gear according to the road conditions and vehicle status. To adapt to complex road conditions, commercial vehicles generally have more than 12 gears in automatic transmissions. This makes it easier to increase the number of gear changes, resulting in economic differences.

[0003] At present, the gear shifting scheme of commercial vehicle automatic transmission in the industry is to achieve gear shifting by directly calibrating the throttle opening and gear shifting speed, without considering economical gear shifting. In particular, when the vehicle is driving at a constant speed or decelerating, economical gear shifting cannot be considered. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a commercial vehicle automatic shift transmission gear shift control method and system, which can reduce unreasonable gear shifting when the vehicle is driving at a constant speed or decelerating at a small throttle opening.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A commercial vehicle automatic shifting transmission shift control method comprises the following steps:

[0007] Acquire a first operating state of the target vehicle, and determine a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle;

[0008] Determine the mileage of the target vehicle in the first running state and the gear position in the first running state by using the vehicle speed of the target vehicle in the first running state, and determine whether to correct the gear position in the first running state by using the mileage of the target vehicle in the first running state;

[0009] After the first operating state gear is corrected, the first up / down gear trigger speed is corrected to the second up / down gear trigger speed; and the up / down gear state is obtained according to the second up / down gear trigger speed and the target gear input shaft speed of the second operating state.

[0010] Furthermore, the acquisition of the first operating state of the target vehicle includes the throttle opening, rotation speed, torque, vehicle speed and vehicle acceleration of the target vehicle.

[0011] Furthermore, the process of determining the vehicle acceleration includes:

[0012] Vehicle acceleration = (current speed - last speed) / time interval.

[0013] Further, the process of determining the first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle includes:

[0014] Control up and down gears according to the preset relationship between the ABS vehicle speed signal and the throttle opening;

[0015] Get the first up / down gear trigger speed when up / down gear is being shifted.

[0016] Further, the process of determining the mileage per 100 kilometers of the target vehicle in the first operating state by using the vehicle speed of the target vehicle in the first operating state includes:

[0017] W = P × 100 / v;

[0018] Wherein, W is 100 kilometers; P is the power in the first operating state; v is the vehicle speed in the first operating state;

[0019] P = n × N / 9550;

[0020] Wherein, n is the rotation speed in the first operating state, and N is the torque in the first operating state.

[0021] Further, the process of using the mileage per 100 kilometers of the first operating state to determine whether to correct the gear position of the first operating state includes:

[0022] The first operating state gear position correction is performed when the throttle opening is less than a preset opening threshold.

[0023] Furthermore, the process of performing the first operating state gear correction when the throttle opening is less than a preset opening threshold comprises:

[0024] When the acceleration in the first operating state is less than the first acceleration preset threshold, a downshift delay time is set, during which the work done at the current moment is less than the work done at the preset shift position, and the downshift trigger speed is corrected to the set value;

[0025] When the acceleration in the first operating state is greater than or equal to the first acceleration preset threshold and less than the second acceleration preset threshold, and the throttle opening is kept less than the preset opening threshold before and after the gear shift, and the work done at the first operating state is less than the work done at the preset gear shift point, a downshift correction is performed; wherein the second acceleration preset threshold is greater than the first acceleration preset threshold.

[0026] Furthermore, the method also includes: when the throttle opening is not less than a preset opening threshold, no correction is performed.

[0027] Furthermore, the method is run in a TCU module.

[0028] The present invention also proposes a commercial vehicle automatic shift transmission shift control system, comprising a preprocessing module, a correction module and a control module;

[0029] The preprocessing module is used to obtain a first operating state of the target vehicle, and determine a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle;

[0030] The correction module is used to determine the kilometres per hour and the gear position of the first running state of the target vehicle by using the speed of the target vehicle in the first running state, and to determine whether to correct the gear position of the first running state by using the kilometres per hour of the first running state;

[0031] The control module is used to correct the first up / down gear trigger speed to the second up / down gear trigger speed after correcting the first operating state gear; and obtain the up / down gear state according to the second up / down gear trigger speed and the target gear input shaft speed of the second operating state.

[0032] The effects provided in the content of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0033] The present invention proposes a commercial vehicle automatic shifting gearbox shifting control method and system, the method comprising the following steps: obtaining a first operating state of a target vehicle, determining a first up / down gear triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle; determining the 100-kilometer work of the target vehicle in the first operating state and the first operating state gear position by using the vehicle speed of the target vehicle in the first operating state, and determining whether to correct the first operating state gear position by using the 100-kilometer work of the first operating state; after correcting the first operating state gear position, correcting the first up / down gear triggering speed to a second up / down gear triggering speed; and obtaining the up / down gear position state according to the second up / down gear triggering speed and the target gear input shaft speed of the second operating state. Based on a commercial vehicle automatic shifting gearbox shifting control method, a commercial vehicle automatic shifting gearbox shifting control system is also proposed. The present invention calculates vehicle acceleration by vehicle speed, determines the influence of work on the shifting speed by vehicle speed, torque and vehicle speed, and determines the correction of the up / down gear triggering speed by calculation and judgment. The adjustment of the up / down gear triggering speed can realize economical shifting in the high gear area of ​​the vehicle, reduce the number of shifts and fuel economy, and improve the life of the shifting actuator to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of a commercial vehicle automatic gearbox shift control method proposed in Embodiment 1 of the present invention;

[0035] Figure 2A control logic diagram of an economical shift control method for an automatic transmission of a commercial vehicle proposed in Embodiment 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of a commercial vehicle automatic shift transmission shift control system proposed in Example 3 of the present invention. DETAILED DESCRIPTION

[0037] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0038] Example 1

[0039] Embodiment 1 of the present invention proposes a commercial vehicle automatic shifting transmission shift control method, which can reduce unreasonable gear shifting when the vehicle is driving at a constant speed or decelerating at a small throttle opening, and solve the technical problem of poor fuel economy in certain operating scenarios.

[0040] Figure 1 A flow chart of a commercial vehicle automatic gearbox shift control method proposed in Embodiment 1 of the present invention;

[0041] In step S1, a first operating state of the target vehicle is acquired, and a first upshift and downshift triggering speed of the target vehicle in the first operating state is determined based on the first operating state of the target vehicle;

[0042] The first operating state of the target vehicle includes the throttle opening, rotation speed, torque, vehicle speed and vehicle acceleration of the target vehicle.

[0043] In the present application, the TCU module determines the first upshift and downshift triggering speed in the first operating state of the vehicle according to the ABS vehicle speed signal and the throttle opening.

[0044] In the present application, upshift and downshift are controlled according to a preset relationship between an ABS vehicle speed signal and a throttle opening; and a first upshift and downshift triggering speed is obtained when upshifting and downshifting.

[0045] The vehicle acceleration is calculated and filtered based on the ABS vehicle speed signal.

[0046] The process of determining vehicle acceleration includes:

[0047] Vehicle acceleration = (current speed - last speed) / time interval.

[0048] The first upshift and downshift triggering speed is the actual or set value at the previous basic shift line just crossed.

[0049] In step S2, the mileage of the target vehicle in the first running state and the gear position in the first running state are determined by using the vehicle speed of the target vehicle in the first running state, and the mileage of the target vehicle in the first running state is used to determine whether to correct the gear position in the first running state;

[0050] Figure 2 A control logic diagram of an economical shift control method for an automatic transmission of a commercial vehicle proposed in Embodiment 1 of the present invention;

[0051] The present application: The process of determining the mileage of the target vehicle in the first running state by using the speed of the target vehicle in the first running state includes:

[0052] W = P × 100 / v;

[0053] Wherein, W is 100 kilometers; P is the power in the first operating state; v is the vehicle speed in the first operating state;

[0054] P = n × N / 9550;

[0055] Wherein, n is the rotation speed in the first operating state, and N is the torque in the first operating state.

[0056] The process of judging whether to correct the gear position in the first operating state based on the work per 100 kilometers in the first operating state includes:

[0057] When the throttle opening is less than the preset opening threshold, the first operating state gear position correction is performed; when the throttle opening is less than the preset opening threshold, it is defined as a small throttle state, and correction is performed only under the small throttle state, otherwise no correction is performed;

[0058] When the acceleration in the first running state is less than or equal to the first acceleration preset threshold, it is a deceleration state;

[0059] When the acceleration in the first operating state is less than the first acceleration preset threshold value and the throttle is kept low, a downshift delay time is set. Within the downshift delay time, the work done at the current moment is less than the work done at the preset shift position, and the downshift trigger speed is corrected to the set value;

[0060] If the throttle cannot be maintained at a low level, it means that there may be a need for power due to deceleration for climbing a slope;

[0061] It is defined that when the acceleration of the first running state is greater than or equal to a first acceleration preset threshold value and less than a second acceleration preset threshold value, it is a uniform speed state, wherein the second acceleration preset threshold value is greater than the first acceleration preset threshold value.

[0062] When the acceleration in the first operating state is greater than or equal to the first acceleration preset threshold value and less than the second acceleration preset threshold value, and the throttle opening is kept less than the preset opening threshold value before and after the gear shift, and the work done at the first operating state is less than the work done at the preset gear shift point, a downshift correction is performed to achieve more economical operation;

[0063] If the throttle cannot be maintained at a low level after shifting, it will be difficult for the driver to control the vehicle.

[0064] It is defined that when the acceleration of the first running state is greater than the second acceleration preset threshold value, it is an acceleration state;

[0065] When accelerating, the vehicle mainly requires power without making any economic corrections.

[0066] When the vehicle runs to the low gear area, the vehicle mainly runs in the acceleration range, and the vehicle shifts gears according to the first up-down gear trigger speed, and the TCU module does not perform correction shifting.

[0067] Taking a 16-speed gearbox as an example, the low gear range refers to 1-2-3-4-5-6-7-8-9-10.

[0068] The feature of realizing economical shifting of the present invention is as follows: by innovatively setting the parameter kW per 100 km, the parameter is estimated and compared before and after the shifting, and when the condition is met, it means that the operation after correction is more economical, then a delayed downshift correction is implemented.

[0069] In step S3, after the first operating state gear is corrected, the first up / down gear triggering speed is corrected to the second up / down gear triggering speed;

[0070] The second up / down gear triggering speed is determined by taking into account that the speed after the gear shift is within a preset optimal speed range.

[0071] In step S4, the up / down gear state is obtained according to the second up / down gear triggering speed and the target gear input shaft speed of the second operating state.

[0072] In a commercial vehicle automatic shifting transmission shift control method proposed in this application, the required hardware modules include: an accelerator pedal, a TCU module, a transmission hardware module, an ABS control unit, and an engine control unit, etc.

[0073] The TCU module communicates with the ABS control unit, engine control unit, etc. through the CAN line; the TCU module is used to calculate the basic upshift trigger speed according to the vehicle's operating status; it also calculates the upshift trigger speed correction coefficient according to the vehicle's 100km / h power, acceleration and gear position; and then calculates the final upshift and downshift trigger speed based on the correction coefficient. The upshift and downshift state is obtained based on the target gear input shaft speed.

[0074] Embodiment 1 of the present invention proposes a commercial vehicle automatic shift transmission gear shift control method, which calculates the vehicle acceleration through the vehicle speed, and determines the influence of work on the gear shift speed according to the vehicle speed, torque and vehicle speed, and determines to correct the upshift and downshift trigger speed through calculation and judgment. The adjustment of the upshift and downshift trigger speed can achieve economical gear shifting in the high gear area of ​​the vehicle, reduce the number of gear shifts and fuel economy, and at the same time can improve the life of the gear shift actuator to a certain extent.

[0075] A commercial vehicle automatic gearbox shift control method proposed in Example 1 of the present invention can reduce unreasonable gear shifting when the vehicle is driving at a constant speed or decelerating at a small throttle opening.

[0076] Example 2

[0077] Based on a commercial vehicle automatic shifting transmission shift control method proposed in Example 1 of the present invention, Example 2 of the present invention proposes a commercial vehicle automatic shifting transmission shift control system. Figure 3 This is a schematic diagram of a commercial vehicle automatic gearbox shift control system proposed in Example 3 of the present invention. The system also includes a preprocessing module, a correction module and a control module;

[0078] The preprocessing module is used to obtain a first operating state of the target vehicle, and determine a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle;

[0079] The first operating state of the target vehicle includes the throttle opening, rotation speed, torque, vehicle speed and vehicle acceleration of the target vehicle.

[0080] In the preprocessing module, the TCU module in the present application determines the first upshift and downshift triggering speed in the first operating state of the vehicle according to the ABS vehicle speed signal and the throttle opening.

[0081] In the present application, upshift and downshift are controlled according to a preset relationship between an ABS vehicle speed signal and a throttle opening; and a first upshift and downshift triggering speed is obtained when upshifting and downshifting.

[0082] The vehicle acceleration is calculated and filtered based on the ABS vehicle speed signal.

[0083] The process of determining vehicle acceleration includes:

[0084] Vehicle acceleration = (current speed - last speed) / time interval.

[0085] The first upshift and downshift triggering speed is the actual or set value at the previous basic shift line just crossed.

[0086] The correction module is used to determine the kilometres per hour and the gear position of the first running state of the target vehicle by using the vehicle speed of the first running state of the target vehicle, and to determine whether to correct the gear position of the first running state by using the kilometres per hour of the first running state;

[0087] The process executed by the correction module includes: the process of determining the mileage of the target vehicle in the first running state by using the speed of the target vehicle in the first running state includes:

[0088] W = P × 100 / v;

[0089] Wherein, W is 100 kilometers; P is the power in the first operating state; v is the vehicle speed in the first operating state;

[0090] P = n × N / 9550;

[0091] Wherein, n is the rotation speed in the first operating state, and N is the torque in the first operating state.

[0092] The process of judging whether to correct the gear position in the first operating state based on the work per 100 kilometers in the first operating state includes:

[0093] When the throttle opening is less than the preset opening threshold, the first operating state gear position correction is performed; when the throttle opening is less than the preset opening threshold, it is defined as a small throttle state, and correction is performed only under the small throttle state, otherwise no correction is performed;

[0094] When the acceleration in the first running state is less than or equal to the first acceleration preset threshold, it is a deceleration state;

[0095] When the acceleration in the first operating state is less than the first acceleration preset threshold value and the throttle is kept low, a downshift delay time is set. Within the downshift delay time, the work done at the current moment is less than the work done at the preset shift position, and the downshift trigger speed is corrected to the set value;

[0096] If the throttle cannot be maintained at a low level, it means that there may be a need for power due to deceleration for climbing a slope;

[0097] It is defined that when the acceleration of the first running state is greater than or equal to a first acceleration preset threshold value and less than a second acceleration preset threshold value, it is a uniform speed state, wherein the second acceleration preset threshold value is greater than the first acceleration preset threshold value.

[0098] When the acceleration in the first operating state is greater than or equal to the first acceleration preset threshold value and less than the second acceleration preset threshold value, and the throttle opening is kept less than the preset opening threshold value before and after the gear shift, and the work done at the first operating state is less than the work done at the preset gear shift point, a downshift correction is performed to achieve more economical operation;

[0099] If the throttle cannot be maintained at a low level after shifting, it will be difficult for the driver to control the vehicle.

[0100] It is defined that when the acceleration of the first running state is greater than the second acceleration preset threshold value, it is an acceleration state;

[0101] When accelerating, the vehicle mainly requires power without making any economic corrections.

[0102] When the vehicle runs to the low gear area, the vehicle mainly runs in the acceleration range, and the vehicle shifts gears according to the first up-down gear trigger speed, and the TCU module does not perform correction shifting.

[0103] Taking a 16-speed gearbox as an example, the low gear range refers to 1-2-3-4-5-6-7-8-9-10.

[0104] The feature of realizing economical shifting of the present invention is as follows: by innovatively setting the parameter kW per 100 km, the parameter is estimated and compared before and after the shifting, and when the condition is met, it means that the operation after correction is more economical, then a delayed downshift correction is implemented.

[0105] The control module is used to correct the first up / down gear trigger speed to the second up / down gear trigger speed after correcting the first operating state gear; and obtain the up / down gear state according to the second up / down gear trigger speed and the target gear input shaft speed of the second operating state.

[0106] In the control module, the second upshift and downshift trigger speed is determined by taking into account that the speed after the gear shift is within a preset optimal speed range.

[0107] Embodiment 2 of the present invention proposes a commercial vehicle automatic gearbox shift control system, which calculates vehicle acceleration through vehicle speed, and determines the influence of work on the shift speed according to vehicle speed, torque and vehicle speed, and makes corrections to the upshift and downshift trigger speed through calculation and judgment. The adjustment of the upshift and downshift trigger speed can realize economical shifting in the high gear area of ​​the vehicle, reduce the number of gear shifts and fuel economy, and at the same time can improve the life of the shift actuator to a certain extent.

[0108] Embodiment 2 of the present invention proposes a commercial vehicle automatic transmission shift control system, which can reduce unreasonable gear shifting when the vehicle is driving at a constant speed or decelerating at a small throttle opening.

[0109] The description of the relevant parts of a commercial vehicle automatic shifting transmission shift control system provided in Example 2 of the present application can be found in the detailed description of the corresponding parts of a commercial vehicle automatic shifting transmission shift control method provided in Example 1 of the present application, and will not be repeated here.

[0110] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0111] Although the above describes the specific implementation of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. For those skilled in the art, other different forms of modifications or deformations can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. On the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A commercial vehicle automatic gearbox shift control method, characterized in that: The following steps are involved: Acquire a first operating state of the target vehicle, and determine a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle; Determine the mileage of the target vehicle in the first running state and the gear position in the first running state by using the vehicle speed of the target vehicle in the first running state, and determine whether to correct the gear position in the first running state by using the mileage of the target vehicle in the first running state; After the first operating state gear is corrected, the first up / down gear trigger speed is corrected to the second up / down gear trigger speed; and the up / down gear state is obtained according to the second up / down gear trigger speed and the target gear input shaft speed of the second operating state.

2. A commercial vehicle automatic transmission shift control method according to claim 1, characterized in that: The obtaining of the first operating state of the target vehicle includes the throttle opening, rotation speed, torque, vehicle speed and vehicle acceleration of the target vehicle.

3. A commercial vehicle automatic gearbox shift control method according to claim 2, characterized in that: The process of determining vehicle acceleration includes: Vehicle acceleration = (current speed - last speed) / time interval.

4. The commercial vehicle automatic transmission shift control method according to claim 1, characterized in that: The process of determining a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle comprises: Control up and down gears according to the preset relationship between the ABS vehicle speed signal and the throttle opening; Get the first up / down gear trigger speed when up / down gear is being shifted.

5. The commercial vehicle automatic transmission shift control method according to claim 2, characterized in that: The process of determining the mileage per 100 kilometers of the target vehicle in the first operating state by using the vehicle speed of the target vehicle in the first operating state includes: W = P × 100 / v; Wherein, W is 100 kilometers; P is the power in the first operating state; v is the vehicle speed in the first operating state; P = n × N / 9550; Wherein, n is the rotation speed in the first operating state, and N is the torque in the first operating state.

6. A commercial vehicle automatic transmission shift control method according to claim 5, characterized in that: The process of using the 100-kilometer work of the first operating state to determine whether to correct the gear position of the first operating state includes: The first operating state gear position correction is performed when the throttle opening is less than a preset opening threshold.

7. A commercial vehicle automatic transmission shift control method according to claim 6, characterized in that: The process of performing the first operating state gear correction when the throttle opening is less than the preset opening threshold comprises: When the acceleration in the first operating state is less than the first acceleration preset threshold, a downshift delay time is set, during which the work done at the current moment is less than the work done at the preset shift position, and the downshift trigger speed is corrected to the set value; When the acceleration in the first operating state is greater than or equal to the first acceleration preset threshold and less than the second acceleration preset threshold, and the throttle opening is kept less than the preset opening threshold before and after the gear shift, and the work done at the first operating state is less than the work done at the preset gear shift point, a downshift correction is performed; wherein the second acceleration preset threshold is greater than the first acceleration preset threshold.

8. The commercial vehicle automatic transmission shift control method according to claim 6, characterized in that: The method further includes: when the throttle opening is not less than a preset opening threshold, no correction is performed.

9. A commercial vehicle automatic transmission shift control method according to any one of claims 1 to 8, wherein the method is run in a TCU module.

10. A commercial vehicle automatic transmission shift control system, characterized in that: It includes a pre-processing module, a correction module and a control module; The preprocessing module is used to obtain a first operating state of the target vehicle, and determine a first upshift and downshift triggering speed of the target vehicle in the first operating state based on the first operating state of the target vehicle; The correction module is used to determine the kilometres per hour and the gear position of the first running state of the target vehicle by using the speed of the target vehicle in the first running state, and to determine whether to correct the gear position of the first running state by using the kilometres per hour of the first running state; The control module is used to correct the first up / down gear trigger speed to the second up / down gear trigger speed after correcting the first operating state gear; and obtain the up / down gear state according to the second up / down gear trigger speed and the target gear input shaft speed of the second operating state.

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