CN116292866A

CN116292866A - Gear adjusting method of reduction gearbox, terminal equipment and storage medium

Info

Publication number: CN116292866A
Application number: CN202310250408.3A
Authority: CN
Inventors: 张庆祝; 韩兆东; 刘杰
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-06-23

Abstract

The application is applicable to the technical field of intelligent automobiles, and provides a gear adjusting method of a reduction gearbox, terminal equipment and a storage medium, wherein the method comprises the following steps: when the reduction gearbox is shifted from the neutral position to the target gear, a first current distance between the neutral position and the target gear needs to be detected, and when the first current distance is smaller than or equal to a preset distance, the neutral position is determined to be deviated to the target gear; searching a gear entering strategy corresponding to the first current distance, and executing the determined gear entering strategy. When the neutral deviation is determined to be towards the target gear, the corresponding gear entering strategy can be determined according to the distance between the neutral and the target gear, and gear entering strategies corresponding to different distances are set, so that the problem that the gear shifting operation cannot be realized when the reduction gearbox is deviated in the neutral is solved; the gear shifting requirement of the reduction gearbox during neutral gear shifting is met, and the service performance of the reduction gearbox is guaranteed.

Description

Gear adjusting method of reduction gearbox, terminal equipment and storage medium

Technical Field

The application belongs to the technical field of intelligent automobiles, and particularly relates to a gear adjusting method of a reduction gearbox, terminal equipment and a storage medium.

Background

The reduction gearbox is a power transmission device and is an indispensable device in an automobile. The reduction gearbox may be referred to as a speed reducer or speed reducer, and is mainly aimed at reducing the output of the motor or increasing the output of the motor. The two-gear reduction gearbox is a reduction gearbox with three gears, and can provide higher speed and higher driving efficiency for the vehicle, so that the two-gear reduction gearbox is gradually used in a large range.

At present, due to vibration of a vehicle or release of pressing force during gear shifting and the like, a shifting fork of a reduction gearbox cannot return to the original neutral position, and the neutral position of the reduction gearbox is shifted. When the neutral position of the reduction gearbox is deviated, the vehicle cannot shift according to the original strategy, so that the reduction gearbox fails to shift.

Disclosure of Invention

The embodiment of the application provides a gear adjusting method of a reduction gearbox, terminal equipment and a storage medium, which can solve the problem that the reduction gearbox cannot shift gears when neutral gear of the reduction gearbox is shifted.

In a first aspect, an embodiment of the present application provides a gear adjustment method for a reduction gearbox, including:

detecting a first current distance between a neutral gear and a target gear when the reduction gearbox is shifted from the neutral gear to the target gear;

If the first current distance is smaller than a preset distance, searching a gear entering strategy corresponding to the first current distance, wherein different gear intervals are preset to correspond to different gear entering strategies;

executing a gear-shifting strategy corresponding to the first current distance.

In a second aspect, embodiments of the present application provide a vehicle, including:

the distance detection module is used for detecting a first current distance between the neutral position and the target gear when the reduction gearbox is shifted from the neutral position to the target gear;

the strategy determining module is used for searching a gear entering strategy corresponding to the first current distance if the first current distance is smaller than a preset distance, wherein different gear entering strategies corresponding to different inter-gear distances are preset;

and the strategy execution module is used for executing the gear entering strategy corresponding to the first current distance.

In a third aspect, an embodiment of the present application provides a terminal device, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the gear adjustment method of the reduction gearbox of any one of the first aspects when the computer program is executed.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the gear adjustment method of the reduction gearbox of any one of the first aspects above.

In a fifth aspect, embodiments of the present application provide a computer program product, which when run on a terminal device, causes the terminal device to perform the gear adjustment method of the reduction gearbox according to any one of the first aspects above.

Compared with the prior art, the embodiment of the first aspect of the application has the beneficial effects that: when the reduction gearbox is adjusted from the neutral position to the target gear, a first current distance between the neutral position and the target gear needs to be detected, and when the first current distance is smaller than or equal to a preset distance, the neutral position is determined to be deviated to the target gear; searching a gear entering strategy corresponding to the first current distance, and executing the determined gear entering strategy.

When the neutral deviation is determined to be towards the target gear, the corresponding gear entering strategy can be determined according to the distance between the neutral and the target gear, and the gear entering strategy corresponding to different distances is set, so that the problem that the gear shifting operation cannot be realized when the reduction gearbox is deviated in the neutral is solved; the gear shifting requirement of the reduction gearbox during neutral gear shifting is met, and the service performance of the reduction gearbox is guaranteed.

It will be appreciated that the advantages of the second to fifth aspects may be found in the relevant description of the first aspect, and are not described here again.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a reduction gearbox according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a reduction gearbox according to an embodiment of the present disclosure in gear 1;

FIG. 3 is a schematic view of shifting fork to shift 2 when the reduction gearbox is in shift 1 according to an embodiment of the present application;

FIG. 4 is a schematic illustration of neutral to 2 shift of a reduction gearbox provided in an embodiment of the present application;

FIG. 5 is a schematic illustration of a reduction in the distance between neutral and 2 gear of a reduction gearbox provided in an embodiment of the present application;

FIG. 6 is a schematic illustration of neutral to 2 shift of a reduction gearbox provided in an embodiment of the present application;

FIG. 7 is a flowchart of a gear adjustment method for a reduction gearbox according to an embodiment of the present disclosure;

FIG. 8 is a flow chart of a method for shifting gears using a tooth-to-tooth operating strategy according to an embodiment of the present disclosure;

FIG. 9 is a flowchart of a method for entering a drive range using a retry strategy according to an embodiment of the present application;

FIG. 10 is a flowchart illustrating a method for determining a preset distance according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of a vehicle according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in this specification and the appended claims, the term "if" may be interpreted in context as "when … …" or "upon" or "in response to determining" or "in response to detecting". Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".

In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise.

With the development of new energy automobiles, the types of driving motors are more and more, and the driving motors with different powers and different rotating speeds are more and more. The reduction gearbox is a power transmission component of the vehicle. In order to improve the vehicle speed and the efficiency of an electric drive system, a two-gear reduction gearbox is gradually used in a large amount.

Specifically, the two-gear reduction gearbox has three gears, namely neutral gear (N gear), 1 gear and 2 gear. The two-gear reduction gearbox realizes full-vehicle-speed-range gear shifting through proper switching of transmission ratios of two gears, realizes large torque output when starting, and can enable the whole vehicle to run in a motor high-efficiency interval, so that the power performance of the whole vehicle is optimized, and meanwhile, the energy is further saved.

As shown in fig. 1, the shift structure of the two-speed reduction box may include a shift motor 11, a ball screw 12, a fork 13, a synchronizer 14, and the like. The brushless direct current motor in the gear shifting motor 11 pushes the shifting fork 13 to move on the ball screw 12, and the shifting fork 13 moves to drive the synchronizer 14 to move so as to realize gear shifting.

During the use, the inventor finds that when the reverse gear is parked, as shown in fig. 2, the 1-gear of the two-box reduction gearbox is pressed on the 2-gear side by axial force, the gear pushes the gear sleeve, and the gear sleeve and the shifting fork are pressed on the 1-gear side. When the gear sleeve and the fork are pressed at the 1 st gear side, the fork is moved to the 2 nd gear side by a certain distance due to the release of the pressing force, and the fork is moved to the 2 nd gear side by Δd as shown in fig. 3. After the shift fork moves to the 2 nd gear side by a certain distance, when the shift fork needs to be shifted to the 2 nd gear, the shift fork shifts back to the neutral position, and as shown in fig. 4, the neutral position of the shift fork shifts to the 2 nd gear side by Δd. Because the neutral position of the two-gear reduction gearbox is shifted, the distance from the neutral position to the 2 gear is smaller than the distance required by the gear shift of the equipment in advance, the gear shift stroke cannot be matched with the software pre-stored stroke, and the gear shift fails, as shown in fig. 5, the stroke between the neutral position and the 2 gear is D2'. Also for example, in fig. 6, the neutral position is originally in the N position, and the distance between the neutral position and the 2 nd gear may be D2; since the neutral is shifted to the 2 nd position, the neutral is currently in the N 'position, and the distance between the neutral and 2 nd is D2'.

It should be noted that, the above description is given taking the shift of the neutral gear to the 2 nd gear as an example, however, in practical application, there may be a shift of the neutral gear to the 1 st gear, and the description of the shift of the neutral gear to the 1 st gear will refer to the description of the shift of the neutral gear to the 2 nd gear, and will not be repeated here.

Based on the problem that the gear shifting of the two-gear reduction gearbox cannot be achieved after the neutral gear is shifted, the application provides a gear adjusting method of the reduction gearbox, after the neutral gear is shifted to a target gear, a gear shifting strategy for shifting to the target gear is determined based on the distance between the neutral gear and the target gear, and the gear shifting operation is performed according to the determined gear shifting strategy.

Fig. 7 shows a schematic flowchart of a gear adjustment method of the reduction gearbox provided by the application, and with reference to fig. 7, the method is described in detail as follows:

s101, detecting a first current distance between a neutral gear and a target gear when the reduction gearbox is shifted from the neutral gear to the target gear.

In this embodiment, the target gear may be 1 st gear or 2 nd gear.

In this embodiment, the method for detecting the first current distance between the neutral gear and the target gear includes:

and controlling a shifting fork in the reduction gearbox to move from the neutral position to the target gear, and obtaining the actual moving distance of the shifting fork when the shifting fork moves to the limit position, wherein the actual moving distance of the shifting fork is a first current distance (the travel distance of the shifting fork) between the neutral position and the target gear. Specifically, when the shift fork is pushed to move by the shift motor, the shift fork is determined to move to the limit position when the shift fork cannot be pushed to move continuously, and the first current distance between the neutral position and the target gear is calculated by calculating the number of turns rotated by the ball screw.

In this embodiment, the first current distance may also be measured by a distance sensor or the like, and of course, other existing methods may also be used for measuring the first current distance, which is not limited herein.

In this embodiment, the gear shifting process of the reduction gearbox includes: the reduction gearbox is shifted to a neutral position, speed regulation is carried out in the neutral position, and after the speed regulation is finished, the shifting fork is moved to enter a target gear.

Specifically, the shift controller (Actuator Control Unit for Electrical Axle Actuator, ACU) sends information to the overall vehicle controller (Hybrid vehicle Control Unit, HCU) that the current gear is valid, which characterizes the current neutral availability. And after the HCU receives the information that the current gear is valid, the HCU sends a target gear and a gear shifting permission instruction to the ACU. The ACU responds to the target gear and the shift permission command. The gear shifting process of the reduction gearbox may include: shift-out to neutral, neutral speed-regulation, and shift-in to target gear. Specifically, the ACU controls the reduction gearbox to shift out to neutral, and then performs an operation of detecting the first current distance. Or after the ACU controls the reduction gearbox to shift to the neutral position and the speed regulation is finished, the operation of detecting the first current distance is executed. Or after the ACU controls the reduction gearbox to shift to the neutral position and the speed regulation is finished, detecting the first current distance in the gear entering process.

S102, if the first current distance is smaller than a preset distance, searching a gear entering strategy corresponding to the first current distance, wherein different gear intervals are preset to correspond to different gear entering strategies.

In this embodiment, the preset distance may be a preset distance between the original neutral position and the target gear. When the first current distance is smaller than the preset distance, the neutral position is determined to deviate to the target gear, and if the gear is shifted continuously according to the originally stored gear shifting strategy, the gear shifting is failed, so that the gear shifting strategy needs to be determined again.

Specifically, the method and the device preset corresponding gear shift strategies among different gears, and determine the gear shift strategy needed by the current time according to the first current distance. For example, different distance intervals are preset, and each distance interval corresponds to a gear entering strategy; after the first current distance is obtained, searching a distance interval in which the first current distance is located, and determining a gear shift strategy corresponding to the distance interval in which the first current distance is located as the gear shift strategy corresponding to the first current distance. Or, a strategy comparison table is preset, and the strategy comparison table stores the gear entering strategies corresponding to different gear intervals.

S103, executing a gear-shifting strategy corresponding to the first current distance.

In this embodiment, the shift fork is controlled to move according to the determined gear shift strategy, so as to perform the gear shift operation.

In the embodiment of the application, when the reduction gearbox is adjusted from the neutral position to the target gear, a first current distance between the neutral position and the target gear needs to be detected, and when the first current distance is smaller than or equal to a preset distance, the neutral position is determined to be biased to the target gear; searching a gear entering strategy corresponding to the first current distance, and executing the determined gear entering strategy. When the neutral deviation is determined to be towards the target gear, the corresponding gear entering strategy can be determined according to the distance between the neutral and the target gear, and gear entering strategies corresponding to different distances are set, so that the problem that the gear shifting operation cannot be realized when the reduction gearbox is deviated in the neutral is solved; the gear shifting requirement of the reduction gearbox during neutral gear shifting is met, and the service performance of the reduction gearbox is guaranteed. In addition, the gear entering strategy is determined according to the first current distance, so that the determined gear entering strategy is more in line with the current state of the reduction gearbox, and the success rate of gear entering operation is further improved.

In one possible implementation, the implementation procedure of step S102 may include:

And if the first current distance is in a preset tooth-to-tooth interval, determining a tooth-to-tooth working condition strategy as a gear shift strategy corresponding to the first current distance, wherein the tooth-to-tooth working condition strategy comprises gear shift operation after eliminating tooth-to-tooth.

In this embodiment, if the first current distance is smaller than the preset distance, the gear-to-gear may occur during gear shifting, that is, when the shift fork moves to the limit position, the shift fork moves a distance exactly within the gear-to-gear interval. Tooth-to-tooth (tooth to tooth) is tooth-striking, specifically, in the gear shifting process, after synchronization is completed, the tooth sleeve conical surface passes through the synchronous ring conical surface, and is about to enter into a tooth feeding stage, when the tooth sleeve conical surface is about to contact with the critical point of the combined tooth conical surface, the tooth sleeve contacts with the sharp point of the combined tooth conical surface, and the tooth sleeve is defined as a tooth-to-tooth point at the moment. If the gear-to-gear shift occurs during the gear shift, the gear shift may fail, and even more so, the gears may be damaged, causing the reduction gearbox to fail. Therefore, for the tooth-to-tooth section, a gear shift is required by utilizing a gear shift strategy under the tooth-to-tooth working condition.

The data in the tooth-to-tooth interval are all strokes of the shifting fork from the neutral position. For example, the tooth-to-tooth range may be set to 3.3-5.7,3.3 for a shift fork travel out of neutral of 3.3;5.7 is the travel of the fork out of neutral is 5.7.

For example, if the tooth-to-tooth interval is 3.3-5.7 and the first current distance is 4.2, it is determined that the first current distance is within the preset tooth-to-tooth interval.

In this embodiment, the tooth-to-tooth elimination strategy includes controlling the synchronizer rotation such that tooth-to-tooth staggering of the synchronizer and the bond tooth occurs.

In one possible implementation, as shown in fig. 8, the reduction gearbox includes a shift motor, synchronizer, and coupling teeth. The gear step strategy corresponding to the first current distance is the gear-to-gear working condition strategy, and the implementation process of step S103 may include:

and S201, when the reduction gearbox is in neutral, controlling the gear shifting motor to rotate according to a preset torque, and detecting the rotating speed of the gear shifting motor, wherein the gear shifting motor drives the synchronizer to rotate when rotating, so that the synchronizer with teeth and the combined teeth are staggered.

In this embodiment, if the reduction gearbox is not in neutral, the reduction gearbox is shifted to neutral first, that is, the shift fork is retracted to the initial position. When the reduction gearbox is in neutral position, a gear shifting motor in the reduction gearbox is controlled to be in a rotating speed control mode, the gear shifting motor is requested to rotate with preset torque, and the synchronizer is driven to rotate through rotation of the gear shifting motor, so that the synchronizer and the combined teeth miss the teeth. The preset torque can be set according to the requirement, for example, a smaller torque can be set, and the gear shifting motor is slowly rotated to drive the staggered teeth.

And S202, controlling the reduction gearbox to shift forward from the neutral position to the target gear when the rotating speed of the gear shifting motor is greater than or equal to a preset rotating speed.

In this embodiment, the preset rotation speed may be set as needed. When the rotational speed of the shift motor is greater than or equal to the preset rotational speed, the completion of the staggered teeth is determined, and the shift operation can be continuously performed to shift the reduction gearbox from the neutral position to the target gear.

In practical application, if the rotation speed of the shift motor is less than the preset rotation speed, the fact that the staggered teeth are not completed is indicated, and waiting is needed to be continued so as to determine whether the rotation speed of the shift motor can reach the preset rotation speed. If the rotating speed of the gear shifting motor still does not reach the preset rotating speed after waiting for the preset time, determining that the gear shifting motor cannot respond to the preset torque to rotate, and retransmitting another preset torque to the gear shifting motor to detect whether the rotating speed of the gear shifting motor can reach the preset rotating speed.

In the embodiment of the application, when the first current distance is in the preset tooth-to-tooth interval, the tooth-to-tooth working condition strategy is executed, automatic staggered teeth are performed first, and then the gear shifting operation is performed, so that gear damage in the gear shifting process is avoided, and meanwhile, the phenomenon that gear dropping occurs due to incomplete engagement after gear shifting is avoided.

if the first current distance is greater than the maximum value of the preset tooth-to-tooth interval, determining a retry strategy as a gear shift strategy corresponding to the first current distance, wherein the retry strategy comprises performing gear shift operation after the preset distance is reduced by a preset value.

In this embodiment, if the first current distance is greater than the maximum value of the preset tooth-to-tooth interval, it is indicated that the distance moved by the shift fork exceeds the tooth-to-tooth interval, and at this time, the tooth-to-tooth working condition strategy cannot be used any more, and the running gear operation needs to be performed by using the retry strategy corresponding to the condition that the distance exceeds the tooth-to-tooth interval.

Specifically, since the program can be executed to complete the gear shift operation only when the preset distance recorded in the program is the same as the actual moving distance of the shifting fork, the retry strategy is mainly to change the preset distance in the original program, so that when the shifting fork is controlled to move by the program, the shifting fork can be moved according to the preset distance required in the program, and the gear shift operation is realized.

As shown in fig. 9, in one possible implementation manner, the step S103 may include:

S301, when the reduction gearbox is in the neutral position, reducing the preset distance by the preset value to obtain a corrected distance.

In this embodiment, if the reduction gearbox is not in neutral, it is necessary to control the reduction gearbox to shift to neutral first, that is, to control the shift fork to move to the initial neutral position. If the reduction gearbox is in neutral, no further neutral adjustment is required.

The preset value may be set as needed, and in order to prevent excessive adjustment, the preset value may be set to a smaller value, for example, the preset value may be set to 1mm or 2mm or the like.

Specifically, the preset distance is subtracted by a preset value to obtain the corrected distance. If the preset distance is a section, subtracting the preset value from the minimum value and subtracting the preset value from the maximum value of the preset distance to obtain the corrected distance.

S302, detecting a second current distance between the neutral gear and the target gear.

In this embodiment, the method for detecting the second current distance is the same as the method for detecting the first current distance, and will not be described here again.

In addition, since the shift fork has a certain elasticity, and the neutral position can be a section, that is, when the shift fork is at any position in the section, the shift fork can be regarded as the neutral position of the reduction gearbox, so that when the shift fork moves towards the target gear, the distance of each movement may be different, and therefore, in order to ensure that the gear is successfully shifted as far as possible, the distance between the neutral position and the target gear needs to be detected again.

By way of example, when the fork is first displaced from neutral to the target gear, it is determined that the current distance between neutral and target gear is 5mm, after being displaced by 5mm, it is no longer possible to displace (i.e. to reach the limit position). When the shifting fork moves from the neutral position to the target gear for the second time, the shifting fork can not move any more after moving for 4.9mm, and the current distance between the neutral position and the target gear is determined to be 4.9mm.

And S303, if the second current distance is greater than or equal to the corrected distance, controlling the reduction gearbox to finish the operation of shifting to the target gear.

In this embodiment, since the fork has moved to the limit position when the second current distance is detected, the subsequent operation, for example, the shift operation may be continued without further movement of the fork when the control gearbox completes the shift operation to the target gear.

And S304, if the second current distance is smaller than the correction distance, continuing to execute the retry strategy.

In this embodiment, if the second current distance is still smaller than the correction distance, the correction distance may be reduced continuously and then the gear-advancing attempt may be performed again, so as to determine whether the gear-advancing may be successful or not, until the gear-advancing success or the retry number reaches the preset number.

In practical application, if the second current distance is smaller than the correction distance, determining the times of executing the retry strategy; and if the number of times of executing the retry strategy is smaller than the preset number of times, continuing to execute the retry strategy. And if the number of times of executing the retry strategy is equal to the preset number of times, determining that the gear entering fails.

Specifically, a count is required each time a retry strategy is executed to determine the number of retries.

In this embodiment, if the forward gear is successful before the number of times of executing the retry strategy reaches the preset number of times, it is determined that the neutral shift to the target gear is completed. If the number of times of executing the retry strategy reaches the preset number of times, the shift is still determined to be not advanced to the target gear, the shift advancing operation is not advanced any more, and the shift failure is determined. The preset number of times may be set as needed, for example, the preset number of times may be 3 times or 4 times, etc.

If the gear shift is successful, the ACU may report that the HCU current reduction gearbox is in the target gear; the ACU records the number of times the retry strategy is executed. If the gear shifting fails, the ACU can report the gear shifting failure of the HCU reduction gearbox; the ACU records the number of times the retry strategy is executed, for example, stores the number of times the retry strategy is executed in a charged erasable programmable read-only memory (Electrically Erasable Programmable read only memory, EEPROM).

In this embodiment of the present application, when the first current distance is greater than the maximum value of the preset tooth-to-tooth interval, the initial preset distance is changed, so that the distance between the neutral gear and the target gear recorded in the program approaches to the actual distance between the neutral gear and the target gear as much as possible, so that the program can be continuously executed to complete the gear-entering operation.

In one possible implementation manner, the method may further include: if the vehicle executes the retry strategy, the first information is stored, and the first information characterizes the execution of the retry strategy so as to warn that the next power-on is performed for confirming the gear again.

Specifically, after the whole vehicle is electrified, whether a retry strategy is executed in the last gear shifting operation is acquired; and if the retry strategy is executed in the last gear shifting operation, controlling the reduction gearbox to perform self-learning so as to determine the preset distance between the neutral position and the first gear and the preset distance between the neutral position and the second gear. The target gear may be a first gear or a second gear. The preset distance may be stored in an EEPROM.

In one possible implementation manner, after the vehicle is powered down, the distance between the neutral position and the first gear and the distance between the neutral position and the second gear can be determined through self-learning, so that whether the neutral position is shifted or not can be judged when the reduction gearbox is shifted after the vehicle is powered up next time. The first gear and the second gear may each be noted as other gears.

In one possible implementation manner, the preset distance used in the present gear shift may be determined by self-learning after the vehicle is powered up.

Specifically, after the whole vehicle of the vehicle is electrified, the ACU sends gear unknown information to the HCU; after the HCU receives the unknown gear information, a self-learning instruction is sent to the ACU; and after receiving the self-learning instruction, the ACU starts self-learning.

As shown in fig. 10, the method of self-learning determination of the distance between neutral and other gears may include:

s401, when the reduction gearbox is in neutral position, controlling the reduction gearbox to shift into a first gear.

Specifically, the reduction gearbox is in neutral, and the shifting fork is controlled to move from neutral to the first gear, namely, the shifting fork moves to the position where the first gear is located until the shifting fork can not move any more (reaches the hard dead point position), so that the hard dead point position of the first gear is obtained. The first gear may be 1 or 2.

S402, controlling the reduction gearbox to shift from the first gear to the second gear, and obtaining the inter-gear distance of the shifting fork when the reduction gearbox is shifted from the first gear to the second gear.

In this embodiment, the shift fork is controlled to move from the first gear to the second gear until the shift fork can not move any more (reaches the hard dead point position), the hard dead point position of the second gear is obtained, the travel distance of the shift fork from the first gear to the second gear is obtained, and the travel distance of the shift fork is recorded as the inter-gear distance between the first gear and the second gear.

S403, dividing the inter-gear distance by 2 to obtain a first distance between the neutral gear and the first gear and a second distance between the neutral gear and the second gear, wherein the first distance is used as a preset distance between the first gear and the neutral gear, and the second distance is used as a preset distance between the second gear and the neutral gear.

In the present embodiment, since the neutral position is generally between the first gear position and the second gear position, half of the inter-gear distance is noted as a first distance between the neutral position and the first gear position, and a second distance between the neutral position and the second gear position. The first distance is an ideal distance between the neutral position and the first gear position, and the second distance is an ideal distance between the neutral position and the second gear position.

If the gear is required to be shifted to the first gear, judging whether the neutral position of the reduction gearbox is shifted to the first gear or not by using the first distance; if the gear is required to be shifted to the second gear, judging whether the neutral position of the reduction gearbox is shifted to the second gear or not by using the second distance.

In the embodiment of the application, the distance between the neutral position and other gears is determined by using a self-learning method so as to obtain the neutral position of the reduction gearbox, and a foundation is laid for judging whether the neutral position of the reduction gearbox is offset or not subsequently.

In one possible implementation manner, after step S101, the method may further include:

if the first current distance is greater than the preset distance, the user can enter the running gear according to a preset gear entering flow, and the success of the process is ensured. In the present application, the process flow that the first current distance is greater than the preset distance is not limited, and the existing gear-entering process flow is used.

It should be noted that, the gear adjusting method of the reduction gearbox provided by the application may be to adjust the reduction gearbox of the P4 architecture hybrid vehicle. Of course, the gear adjusting method provided by the application can also be used for adjusting gears of reduction boxes of vehicles with other architectures, and is not limited herein. The P4 architecture hybrid vehicle may be configured with an engine and two electric machines, a P2 electric machine and a P4 electric machine, respectively. The P4 motor can drive the vehicle alone or together with the engine.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.

Corresponding to the gear adjustment method of the reduction gearbox described in the above embodiments, fig. 11 shows a block diagram of the vehicle provided in the embodiment of the present application, and for convenience of explanation, only the portions relevant to the embodiment of the present application are shown.

Referring to fig. 11, the vehicle 500 may include: a distance detection module 510, a policy determination module 520, and a policy enforcement module 530.

The distance detection module 510 is configured to detect a first current distance between the neutral gear and the target gear when the reduction gearbox is shifted from the neutral gear to the target gear;

the policy determining module 520 is configured to search for a gear entering policy corresponding to the first current distance if the first current distance is smaller than a preset distance, where different gear entering policies corresponding to different inter-gear distances are preset;

and a policy execution module 530, configured to execute a gear-entering policy corresponding to the first current distance.

In one possible implementation, the policy determination module 520 may be specifically configured to:

In one possible implementation, the reduction gearbox includes a shift motor, a synchronizer, and a coupling tooth; the gear step strategy corresponding to the first current distance is the gear-to-gear working condition strategy, and the strategy execution module 530 may specifically be configured to:

When the reduction gearbox is in neutral, controlling the gear shifting motor to rotate according to a preset torque, and detecting the rotating speed of the gear shifting motor, wherein the gear shifting motor drives the synchronizer to rotate when rotating so as to enable the synchronizer with teeth to be staggered with the combined teeth;

and when the rotating speed of the gear shifting motor is greater than or equal to a preset rotating speed, controlling the reduction gearbox to shift from the neutral position to the target gear.

In one possible implementation manner, the gear-in policy corresponding to the current gear distance is the retry policy, and the policy executing module 530 may specifically be configured to:

when the reduction gearbox is in the neutral position, reducing the preset distance by the preset value to obtain a corrected distance;

detecting a second current distance between the neutral gear and the target gear;

And if the second current distance is greater than or equal to the corrected distance, controlling the reduction gearbox to finish the operation of shifting to the target gear.

And if the second current distance is smaller than the correction distance, continuing to execute the retry strategy.

In one possible implementation, the policy enforcement module 530 may be further specifically configured to:

determining a number of times the retry strategy is executed;

and if the number of times of executing the retry strategy is smaller than the preset number of times, continuing to execute the retry strategy.

And if the number of times of executing the retry strategy is equal to the preset number of times, determining that the gear entering fails.

In one possible implementation, the distance detection module 510 may be further specifically configured to:

and controlling a shifting fork in the reduction gearbox to move from the neutral position to the target gear, and obtaining the actual moving distance of the shifting fork when the shifting fork moves to the limit position, wherein the actual moving distance of the shifting fork is a first current distance between the neutral position and the target gear.

In one possible implementation manner, the shift-in strategy corresponding to the current shift distance is a retry strategy, and the connection with the strategy execution module 530 further includes:

And the storage module is used for storing first information, wherein the first information characterizes that the retry strategy is executed.

It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

The embodiment of the present application further provides a terminal device, referring to fig. 12, the terminal device 600 may include: at least one processor 610, a memory 620 and a computer program stored in the memory 620 and executable on the at least one processor 610, the processor 610, when executing the computer program, implementing the steps of any of the various method embodiments described above, such as steps S101 to S103 in the embodiment shown in fig. 7. Alternatively, the processor 610 may implement the functions of the modules/units in the above-described apparatus embodiments when executing the computer program, for example, the functions of the distance detection module 510 to the policy execution module 530 shown in fig. 11.

By way of example, a computer program may be partitioned into one or more modules/units that are stored in the memory 620 and executed by the processor 610 to complete the present application. The one or more modules/units may be a series of computer program segments capable of performing specific functions for describing the execution of the computer program in the terminal device 600.

It will be appreciated by those skilled in the art that fig. 12 is merely an example of a terminal device and is not limiting of the terminal device and may include more or fewer components than shown, or may combine certain components, or different components, such as input-output devices, network access devices, buses, etc.

The processor 610 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 620 may be an internal storage unit of the terminal device, or may be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), or the like. The memory 620 is used to store the computer program and other programs and data required for the terminal device. The memory 620 may also be used to temporarily store data that has been output or is to be output.

The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or one type of bus.

The gear adjusting method of the reduction gearbox can be applied to terminal equipment such as computers, tablet computers, notebook computers, netbooks, personal digital assistants (personal digital assistant, PDA) and the like, and the specific type of the terminal equipment is not limited.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed terminal device, apparatus and method may be implemented in other manners. For example, the above-described embodiments of the terminal device are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above-described embodiments, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by one or more processors, the computer program may implement the steps of each of the method embodiments described above.

Also, as a computer program product, the steps of the various method embodiments described above may be implemented when the computer program product is run on a terminal device, causing the terminal device to execute.

Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A gear adjustment method of a reduction gearbox, the method comprising:

detecting a first current distance between a neutral gear and a target gear when a reduction gearbox is shifted from the neutral gear to the target gear;

executing a gear-shifting strategy corresponding to the first current distance.

2. The gear adjustment method of the reduction gearbox according to claim 1, wherein the searching for the gear entering strategy corresponding to the first current distance comprises:

3. The gear position adjustment method of a reduction gearbox according to claim 1 or 2, characterized in that the reduction gearbox comprises a shift motor, a synchronizer and a coupling tooth; the gear-shifting strategy corresponding to the first current distance is a gear-to-gear working condition strategy, and executing the gear-shifting strategy corresponding to the first current distance includes:

4. The gear adjustment method of the reduction gearbox according to claim 1, wherein the searching for the gear entering strategy corresponding to the first current distance comprises:

5. The gear adjustment method of the reduction gearbox according to claim 1 or 4, wherein the gear shift strategy corresponding to the current gear shift distance is a retry strategy, and the executing the gear shift strategy corresponding to the first current gear shift distance includes:

if the second current distance is greater than or equal to the corrected distance, controlling the reduction gearbox to finish the operation of shifting to the target gear;

6. The gear adjustment method of a reduction gearbox of claim 5, wherein prior to said continuing to execute said retry strategy, said method further comprises:

determining a number of times the retry strategy is executed;

Accordingly, the continuing to execute the retry strategy includes:

7. The gear adjustment method of a reduction gearbox according to claim 1, 2 or 4, characterized in that said detecting a first current distance between the neutral gear and the target gear comprises:

8. The gear adjustment method of a reduction gearbox according to claim 4 or 6, wherein the gear shift strategy corresponding to the current gear shift distance is a retry strategy, and after the executing the gear shift strategy corresponding to the first current gear shift distance, the method further comprises:

first information is stored, wherein the first information characterizes that the retry strategy was executed.

9. Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements a gear adjustment method of a reduction gearbox according to any of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the gear adjustment method of the reduction gearbox according to any one of claims 1 to 8.