Method and system for inhibiting gear shifting of automatic gearbox under intense driving working condition

Abstract

The invention discloses a method and a system for inhibiting gear shifting of an automatic gearbox under a fierce driving working condition. According to the method, the operation behavior of a driver is monitored in real time, intense driving condition recognition logic is constructed, and whether the intense driving behavior exists in the driving process or not is judged; and after the intense driving state is recognized, gear shifting logic of the gearbox is intervened, strategies such as target gear output delaying and current gear keeping are adopted, frequent gear shifting operation is restrained, and power output continuity and stability are guaranteed. The system comprises a signal acquisition module, a driving behavior recognition module, a state judgment module and a gear control module, and intelligent adjustment of gear shifting control can be achieved on the premise that the structure of a basic gear shifting model is not changed. According to the invention, the dynamic response, the driving smoothness and the durability of a speed change system of the whole vehicle in a fierce driving scene can be obviously improved, and the method is suitable for various commercial vehicle and passenger vehicle platforms carrying automatic gearboxes.

Description

Technical Field

[0001] The present invention belongs to the field of automatic transmission shift control, and particularly relates to a method and system for suppressing shifts of an automatic transmission under aggressive driving conditions. Background Art

[0002] In the development process of modern automotive technology, the automatic transmission, as a key system for improving vehicle driving convenience and fuel economy, has been widely applied to various passenger cars and commercial vehicles. The shift control strategy of the automatic transmission usually determines the optimal shift timing based on objective parameters such as throttle opening, vehicle speed, load condition, road slope, and ambient temperature through look-up tables or model calculations to achieve a balance between power performance and fuel efficiency. This control logic has been relatively mature and performs well in daily driving scenarios. However, with the diversification of vehicle application scenarios and the individualized development of user driving styles, the traditional automatic transmission control strategy has shown certain limitations under certain specific driving behaviors and urgently needs targeted optimization and improvement.

[0003] In actual use, some drivers have obvious aggressive driving habits, which are usually characterized by frequent, rapid, and large-amplitude throttle and brake operations. Under such conditions, the automatic transmission frequently performs upshift and downshift operations according to the established shift logic to adapt to the rapid changes in throttle or vehicle speed. However, since the shift process itself involves a series of mechanical actions such as the engagement and disengagement of the clutch and the switching of the transmission ratio, if shifts are performed frequently within a short period, it is not only easy to cause power interruption, making the vehicle unable to continuously output the required traction force during aggressive driving, but also may lead to problems such as increased fuel consumption, reduced driving smoothness, and premature wear of mechanical components. Especially for key components such as the transmission and clutch, their durability and reliability will be significantly affected.

[0004] In addition, the traditional shift control strategy focuses on responding to the current driving conditions of the vehicle and rarely considers the dynamic changes in the driver's subjective intention. For example, when a driver maintains an aggressive driving style on highways, congested roads, or in complex urban conditions, if the system blindly adjusts the gear according to the current conditions, it often fails to meet the driver's demand for continuous power response, but instead shows repeated upshifting and downshifting during driving, which not only violates the driver's operation intention but also damages the driving experience. Therefore, the shift decision-making logic constructed solely based on quantitative indicators such as throttle opening and vehicle speed change is difficult to comprehensively cover the complexity and diversity of driving behaviors.

[0005] Especially in the field of commercial vehicle applications, the driver composition is more diverse, the vehicle load conditions change frequently, and the working scenarios are complex and diverse. Drivers often adjust their driving styles according to factors such as freight tasks, road environments, or time urgency. The occurrence frequency and duration of aggressive driving conditions are more uncertain. In this context, how to accurately identify aggressive driving behaviors and reasonably suppress gearshift behaviors of the transmission without interfering with normal driving control, so as to improve the vehicle's power response ability, ensure the stable operation of the transmission system, and extend the lifespan of key components has become a technical problem that urgently needs to be solved in the field of automatic transmission control.

[0006] In recent years, although some research has attempted to incorporate driving intentions into control logic modeling in the directions of intelligent shift strategies, adaptive control algorithms, etc., most methods still remain at simple numerical trigger mechanisms such as throttle change rate and engine speed change, lacking systematic identification and classification of aggressive driving behaviors, and also not providing effective solutions for specific intervention means in shift control for such behaviors. This technical gap makes it impossible for the automatic transmission to achieve intelligent and context-aware shift control adjustment when facing drivers with strong operation tendencies. Summary of the Invention

[0007] To solve the above technical problems and further improve the control adaptability and system durability of the automatic transmission in aggressive driving scenarios, the present invention provides a method and system for suppressing gearshifts of an automatic transmission under aggressive driving conditions, which can identify aggressive driving behaviors in real time during driving and dynamically regulate shift commands accordingly.

[0008] Specifically, the technical solution provided by the present invention is as follows: A method for suppressing gearshifts of an automatic transmission under aggressive driving conditions, comprising: Real-time acquisition of vehicle operation data, including throttle pedal opening and its change rate, brake pedal opening and its change rate, and vehicle output shaft speed change rate; judging whether the vehicle enters an aggressive driving condition according to the acquired vehicle operation data; if entering an aggressive driving condition, performing a shift suppression intervention on the automatic transmission; The aggressive driving condition includes a high-frequency rapid throttle stepping condition: when the throttle pedal opening exceeds a set threshold and the change rate of the throttle pedal opening per unit time exceeds a set range, it is regarded as a rapid throttle stepping event; if the rapid throttle stepping events accumulate to a specified number within a set time window, it is determined as a high-frequency rapid throttle stepping condition; Under the high-frequency rapid throttle stepping condition, the shift suppression intervention is: when the rapid throttle stepping event occurs for the first time, normal shift operations are performed; but when the rapid throttle stepping event occurs again and starts to accumulate, the output of the target gear deduced according to the transmission shift map is suspended, and the current gear is kept unchanged within a set holding period until the holding period ends.

[0009] Further, the aggressive driving condition further includes a large throttle and sudden brake condition: when the opening degree of the throttle pedal exceeds a set threshold, a braking action occurs within a set time, and the change rate of the opening degree of the brake pedal or the decreasing rate of the rotational speed of the vehicle output shaft exceeds a determination threshold, it is determined as the large throttle and sudden brake condition; in the large throttle and sudden brake condition, the shift inhibition intervention is: suspending the output of the target gear deduced according to the gear shift map of the transmission, keeping the current gear unchanged within a set holding period until the holding period ends.

[0010] Further, the aggressive driving condition further includes a sudden brake and large throttle condition: when the change rate of the opening degree of the brake pedal or the decreasing rate of the rotational speed of the vehicle output shaft exceeds a determination threshold, an accelerator pedal stepping action occurs within a set time, and the opening degree of the throttle pedal exceeds a set threshold, it is determined as the sudden brake and large throttle condition; in the sudden brake and large throttle condition, the shift inhibition intervention is: suspending the output of the target gear deduced according to the gear shift map of the transmission, keeping the current gear unchanged within a set holding period until the holding period ends.

[0011] Further, when determining whether it is a high-frequency and rapid throttle stepping condition, a delay window is set. If no such rapid throttle stepping event occurs or a brake signal appears within the time range of the delay window, this determination is terminated, the occurrence times of the rapid throttle stepping event are cleared and re-accumulated.

[0012] Further, the various conditions included in the aggressive driving condition are mutually exclusive, and each condition is triggered separately. If another condition occurs nested within one condition, the processing of the latest condition is preferentially triggered.

[0013] Further, if a forced gear shift is triggered for protecting the transmission or the engine during the holding period, the gear remains unchanged after the gear shift until the holding period ends.

[0014] A shift inhibition system for an automatic transmission under aggressive driving conditions, including a real-time signal acquisition module for real-time acquisition of vehicle operation data; further including a high-frequency and rapid throttle stepping condition recognition and processing module for executing the determination logic of the high-frequency and rapid throttle stepping condition in the above method and performing corresponding shift inhibition intervention operations under the high-frequency and rapid throttle stepping condition.

[0015] Further, it further includes a large throttle and sudden brake condition recognition and processing module for executing the determination logic of the large throttle and sudden brake condition in the above method and performing corresponding shift inhibition intervention operations under the large throttle and sudden brake condition.

[0016] Further, it further includes a hard braking and high throttle condition recognition and processing module, which is used to execute the hard braking and high throttle condition determination logic in the above method, and execute corresponding shift suppression intervention operations under the hard braking and high throttle conditions.

[0017] Further, it further includes a protection response module, which is used to directly execute corresponding protective shift operations when it is necessary to shift gears to trigger transmission or engine protection during the holding period of the shift suppression intervention operation, and keep the gear unchanged until the end of the holding period after the shift is completed.

[0018] By introducing a dynamic recognition and intelligent intervention mechanism for aggressive driving conditions, the present invention makes up for the deficiency of the existing automatic transmission shift strategy in the response to the driver's subjective behavior, and significantly improves the intelligence and personalization level of the shift control system. The traditional automatic transmission shift strategy is mainly based on objective driving conditions, such as vehicle speed, throttle opening, load status, and road condition gradient, and judges the shift timing through a preset shift Map curve, lacking a deep perception of the driver's actual driving intention and adaptive adjustment. Especially when facing a driver with aggressive driving behavior and rapid and frequent operation rhythm, it is extremely easy to cause problems such as frequent shifting, power interruption, and acceleration response delay, which will affect the driving experience and vehicle economy, and at the same time cause unnecessary losses to key hardware such as the clutch and transmission.

[0019] The present invention effectively realizes the accurate recognition of aggressive driving states by designing the recognition logics of various typical aggressive driving behaviors, including high-frequency and rapid throttle operations, combined operations of high throttle and hard braking, and re-acceleration after hard braking, and combining a counter, a delay window, and a threshold determination mechanism. At the same time, by strategically controlling the target gear during aggressive driving, such as delaying shifting, maintaining the current gear, or suppressing the output of the Map command, it is not only possible to avoid torque interruption and traction loss caused by frequent shifting, but also ensure the continuous power output of the engine and transmission during strong acceleration or forced deceleration, meeting the driver's requirements for acceleration performance and handling response. This control strategy also significantly improves driving smoothness, enables the vehicle to maintain a stable transmission state during complex or sudden driving behaviors, reduces the occurrence of jerks and slips, and is particularly suitable for user groups sensitive to power response and operation rhythm. In addition, since this strategy adopts a condition-triggered mutual exclusion mechanism and dynamic delay control in terms of structure, it avoids logical conflicts between different recognition states and ensures that the system can still maintain a stable and efficient shift control process during complex driving operations. For the vehicle platform, the system has good calibratability and adaptability, supports parameter customization according to vehicle model characteristics or market positioning, and is convenient for batch integration and later optimization. At the same time, this method does not require modification of the original transmission hardware structure, and only needs algorithm integration and software deployment at the control strategy level, with good engineering feasibility and cost-effectiveness.

[0020] In summary, the present invention not only realizes a leap from passive working condition perception to active behavior recognition in the shift control strategy, but also brings significant technical improvements in terms of driving performance, system durability and adaptation flexibility, etc., and has broad practical application value and popularization prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0022] Figure 1 It is a schematic diagram for identifying the high-frequency and rapid accelerator pedal depression working condition provided by an embodiment of the present invention; Figure 2 It is a schematic diagram for identifying the sudden braking condition with a large throttle provided by an embodiment of the present invention; Figure 3 It is a schematic diagram for identifying the sudden acceleration condition with a large throttle provided by an embodiment of the present invention; Figure 4 It is a schematic diagram for suppressing the shift logic under the intense driving condition provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1 This embodiment provides a method for suppressing gear shifting of an automatic transmission under an intense driving condition, aiming to identify intense operation behaviors during driving and appropriately intervene in the gear shifting command under specific conditions, so as to reduce frequent gear shifting and ensure continuous power output, thereby improving driving smoothness and hardware durability.

[0025] First, before starting the shift control logic, it is necessary to continuously monitor the operating state of the vehicle, including key parameters such as the opening degree and its change rate of the accelerator pedal, the opening degree and its change rate of the brake pedal, and the change rate of the vehicle output shaft speed. These information can be periodically collected by the vehicle local controller and used as the basic input data for subsequent judgments.

[0026] After entering the normal driving control logic, start to identify whether there is an intense driving condition. The identification process is determined based on the operation characteristics of the driver, mainly covering the following three situations: The first scenario is the behavior of quickly pressing the accelerator pedal frequently within a short period of time.

[0027] As Figure 1 shown, during driving, when the driver frequently and quickly presses the accelerator pedal with the frequency reaching the set value and the accelerator pedal opening being greater than the set value, the first intense driving condition is triggered. Specifically, when the driver presses the accelerator pedal and the accelerator change rate is greater than the set value, the accelerator pedal counter is triggered and the delay judgment is triggered. When the driver quickly presses the accelerator pedal again within the set time of the delay judgment, the counter is incremented by 1. Each time the above-described conditions for quickly pressing the accelerator pedal are met, the counter is incremented by 1. When the counter is greater than or equal to the set number of times, the high-frequency accelerator pedal condition is triggered and directly enters the intense driving condition gear processing; if the counter is not triggered again or the brake pedal is not pressed within the set delay judgment condition after the counter is triggered, the counter is cleared and the recognition logic is exited without affecting normal gear shifting.

[0028] The second scenario is the behavior of pressing the accelerator hard and then braking suddenly.

[0029] As Figure 2 shown, when the driver quickly presses the accelerator pedal and the accelerator opening is greater than the set value, and then presses the brake suddenly again within the set time, the second condition is triggered. The determination of sudden braking needs to be set according to the brake pedal opening or the change rate of the output shaft speed, for example, the change rate of the brake pedal opening or the decrease rate of the vehicle output shaft speed exceeds the determination threshold.

[0030] The third scenario is the operation of quickly accelerating with a large throttle after sudden braking.

[0031] As Figure 3 shown, after the brake is quickly pressed and released, if the accelerator opening quickly rises to a large level within the set time and is accompanied by an obvious change rate of the pedal opening, it is recognized as the third condition.

[0032] When any of the above intense driving conditions is confirmed, the gearshift inhibition stage is entered. In this stage, the output of the target gear derived from the original gearshift map is suspended, and the current gear is temporarily maintained unchanged. This holding state remains effective within the set time period and rejects the upshift / downshift requests caused by vehicle speed, accelerator pedal, or other external conditions. This measure aims to avoid power interruption, increased impact, and transmission component wear caused by frequent gear shifting during intense driving operations. If an event that needs to be prioritized occurs during the holding period, such as the engine speed exceeding the allowable range, the temperature of the transmission components exceeding the standard, or other situations that require forced upshift / downshift, the current inhibition logic is abandoned and the corresponding protective gearshift operation is directly executed. After the forced gearshift is completed, the new gear can be maintained until the end of the delay cycle.

[0033] It should be noted that the Shift Map (referred to as Map for short) is one of the core decision-making bases in the automatic transmission control system, which is a standard or rule table used to determine when to upshift or downshift according to the current operating state of the vehicle (such as throttle opening, vehicle speed, engine speed, etc.). It can be understood as a "two-dimensional or multi-dimensional look-up table control strategy", and its essence is to map some input parameters of the vehicle to a recommended target gear to meet different control objectives such as power performance, economy, or comfort. The shift map belongs to the prior art and has been widely applied in the automatic transmission control systems of modern vehicles.

[0034] Specifically, as Figure 4 shown, for the first working condition, during the period from the first rapid throttle depression to trigger the timer to the end of the delay judgment, the final target gear is not restricted by this driving condition. When the timer increments by 1 again, it starts to hold the previous target gear and is not affected by the shift Map. If the trigger flag of the first working condition is set to 1, the current gear is continued to be maintained and a set delay time is applied. When the driver continues to rapidly depress the throttle at a high frequency, the gear does not change until the transmission or engine protection is triggered to force an upshift or downshift. However, after the shift, the gear continues to remain unchanged until the end of the gear holding delay. For the second and third working conditions, before the trigger flag is set to 1, it does not affect the normal target gear switching output according to the shift Map. Until the second and third working conditions are triggered, the target gear holds the target gear of the previous moment and a set delay time is applied, and the gear does not change until the transmission or engine protection is triggered to upshift or downshift. However, after the shift, the gear continues to be maintained until the end of the gear holding delay. The triggering of the above three working conditions is mutually exclusive, and any one working condition can only be triggered separately. If one working condition nests another working condition, the flag of the previously triggered working condition is set to 0, and the latest working condition is preferentially triggered for processing.

[0035] After the holding time ends, if the aggressive driving behavior no longer appears, the inhibition logic is exited and the conventional shift decision-making mechanism based on vehicle speed and throttle control is reconnected to achieve the closed-loop recovery of the control logic. To adapt to different vehicle models and working conditions, parameters such as the throttle / brake change threshold, judgment window duration, and holding time can also be adaptively calibrated to make the method more flexible and efficient in application to diverse platforms.

[0036] Overall, through the clear process of behavior recognition, state judgment, shift intervention, and recovery control, this method effectively inhibits the frequent gear shifting under aggressive driving conditions, improves the continuity of power transmission, reduces mechanical shock, and significantly improves the driving experience and the durability of the transmission.

[0037] Embodiment 2 Based on the above method, this embodiment provides a shift suppression system for an automatic transmission under aggressive driving conditions, mainly including: a signal acquisition module, a driving behavior recognition module, a state determination module, and a gear control module. The signal acquisition module is responsible for obtaining basic information of the vehicle in real time, such as the throttle, brake, engine speed, and vehicle speed; the driving behavior recognition module analyzes whether the input signals meet the characteristics of aggressive driving; the state determination module determines whether to perform gear suppression intervention based on the results of the behavior recognition; and the gear control module specifically performs operations such as delayed output or gear holding. Each module works together through the CAN bus or a local controller to form a closed-loop control system.

[0038] To further enhance the system stability and usage flexibility, the system also reserves a parameter calibration interface, allowing vehicle manufacturers or transmission calibration engineers to customize parameters such as the throttle change threshold, delay time, and counter settings according to different vehicle models, driver groups, and actual working conditions. In addition, the system has a fault diagnosis and fallback logic. Once a fault occurs in the aggressive driving recognition module or the recognition data is abnormal, it can automatically switch to the basic shift logic to ensure that the vehicle is in a controllable and reliable shift state.

[0039] The above system can execute the shift suppression method for an automatic transmission under aggressive driving conditions described in Embodiment 1, and has the corresponding functional modules and beneficial effects of the method. For technical details not described in detail in this embodiment, reference can be made to the shift suppression method for an automatic transmission under aggressive driving conditions provided in Embodiment 1 of the present invention.

[0040] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solutions, in essence, or the part that contributes to the related technologies can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A method for suppressing gear shifting of an automatic transmission under aggressive driving conditions, characterized in that, Including: Obtain vehicle operation data in real time, including the throttle pedal opening and its change rate, the brake pedal opening and its change rate, and the change rate of the vehicle output shaft speed; Based on the obtained vehicle operation data, determine whether the vehicle enters an aggressive driving condition; if it enters an aggressive driving condition, perform shift inhibition intervention on the automatic transmission; The aggressive driving condition includes a high-frequency rapid throttle stepping condition: when the throttle pedal opening exceeds a set threshold and the change rate of the throttle pedal opening per unit time exceeds a set range, it is regarded as a rapid throttle stepping event; if the rapid throttle stepping events accumulate to a specified number within a set time window, it is determined as a high-frequency rapid throttle stepping condition; Under the high-frequency rapid throttle stepping condition, the shift inhibition intervention is: when the rapid throttle stepping event occurs for the first time, perform normal shifting operation; but when the rapid throttle stepping event occurs again and starts to accumulate, suspend the output of the target gear deduced from the transmission shift map, keep the current gear unchanged within a set holding period until the holding period ends.

2. The shift suppression method according to claim 1, wherein The aggressive driving condition also includes a large throttle and sudden brake condition: when the throttle pedal opening exceeds the set threshold and then a braking action occurs within a set time, and the change rate of the brake pedal opening or the deceleration rate of the vehicle output shaft speed exceeds the determination threshold, it is determined as a large throttle and sudden brake condition; under the large throttle and sudden brake condition, the shift inhibition intervention is: suspend the output of the target gear deduced from the transmission shift map, keep the current gear unchanged within a set holding period until the holding period ends.

3. The shift suppression method according to claim 1, wherein, The aggressive driving condition also includes a sudden brake and large throttle condition: when the change rate of the brake pedal opening or the deceleration rate of the vehicle output shaft speed exceeds the determination threshold and then a throttle stepping action occurs within a set time, and the throttle pedal opening exceeds the set threshold, it is determined as a sudden brake and large throttle condition; under the sudden brake and large throttle condition, the shift inhibition intervention is: suspend the output of the target gear deduced from the transmission shift map, keep the current gear unchanged within a set holding period until the holding period ends.

4. The shift suppression method according to claim 1, characterized in that When determining whether it is a high-frequency rapid throttle stepping condition, set a delay window. If no rapid throttle stepping event or brake signal occurs within the time range of the delay window, terminate this determination, clear the occurrence times of the rapid throttle stepping event and start accumulating again.

5. The shift suppression method according to claim 1, characterized in that, The various conditions included in the aggressive driving condition are mutually exclusive, and each condition is triggered separately. If another condition occurs nested in one condition, the processing of the latest condition is preferentially triggered.

6. The method for suppressing gear shifting according to any one of claims 1 to 3, characterized in that If forced shifting is triggered for transmission or engine protection during the holding period, the gear remains unchanged after shifting until the holding period ends.

7. An inhibition shift system for an automatic transmission under a severe driving condition, characterized in that, It includes a real-time signal acquisition module for real-time acquisition of vehicle operation data; it also includes a high-frequency rapid throttle stepping condition recognition and processing module for executing the high-frequency rapid throttle stepping condition determination logic in the method described in claim 1 or 4 and performing corresponding shift inhibition intervention operations under the high-frequency rapid throttle stepping condition.

8. The shift suppression system according to claim 7, wherein It further includes a wide-open throttle hard braking condition recognition and processing module, which is used to execute the wide-open throttle hard braking condition determination logic in the method described in claim 2, and perform corresponding shift suppression intervention operations under the wide-open throttle hard braking condition.

9. The shift suppression system according to claim 8, characterized in that, It further includes a hard braking wide-open throttle condition recognition and processing module, which is used to execute the hard braking wide-open throttle condition determination logic in the method described in claim 3, and perform corresponding shift suppression intervention operations under the hard braking wide-open throttle condition.

10. The shift suppression system according to claim 9, wherein It further includes a protection response module, which is used to directly execute the corresponding protective shift operation when it is necessary to trigger transmission or engine protection for shifting during the holding period of the shift suppression intervention operation, and keep the gear unchanged until the end of the holding period after the shift is completed.

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