CN116085459A

CN116085459A - Pneumatic AMT (automated mechanical transmission) gear-shifting control method

Info

Publication number: CN116085459A
Application number: CN202310274632.6A
Authority: CN
Inventors: 翟灵瑞; 乔运乾; 李森; 陈国涛; 王维振
Original assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-05-09

Abstract

The invention belongs to the technical field of vehicles, and discloses a pneumatic AMT (automated mechanical transmission) gear shifting control method, which comprises the steps of determining the basic cylinder inflation time length of a gear shifting executing mechanism according to an initial air pressure value and a target gear of the gear shifting cylinder, and monitoring a working condition representation value capable of reflecting the movement working condition of the gear shifting executing mechanism in the gear shifting process; circularly correcting the air charging time length of the cylinder of the gear shifting executing mechanism according to the preset interval time; determining a theoretical value of a working condition representation value at the current moment according to an initial air pressure value of a gear shifting cylinder, a target gear and the current cylinder inflation duration; correcting the basic cylinder inflation time according to the current cylinder inflation time and the difference between the actual value of the current working condition characterization value and the theoretical value of the current working condition characterization value to obtain a first corrected cylinder inflation time for correcting the cylinder inflation time of the gear shifting executing mechanism; and if the current cylinder charging duration is not less than the first corrected cylinder charging duration, stopping charging the gear shifting cylinder.

Description

Pneumatic AMT (automated mechanical transmission) gear-shifting control method

Technical Field

The invention relates to the technical field of vehicles, in particular to a pneumatic AMT (automated mechanical transmission) gear shifting control method.

Background

In the pneumatic AMT gear shifting process, the volume in the cylinder gradually increases along with the movement of the gear shifting position, in order to keep the pressure in the gear shifting cylinder unchanged, the air charging into the cylinder is usually finished after the gear shifting position reaches the target position, that is, the force pushing the gear shifting executing mechanism to move in the whole gear shifting process is not reduced, so that the gear shifting executing mechanism is always in an accelerating state before reaching the target position, mechanical limiting is arranged in the gear shifting executing mechanism, the gear shifting executing mechanism has larger inertia when reaching the limiting position, mechanical impact sound and impact force are excessively large, the service lives of related parts are reduced, and the NVH (noise, vibration and harshness) of the whole gear shifting executing mechanism is unfavorable to be reduced.

Aiming at the problems in the pneumatic AMT gear engaging process, the motion control method and the motion control device (201410812088.7) of the gear selecting and shifting actuating mechanism of the existing patent AMT are characterized in that a preset MAP table is queried according to an initial air pressure value and a target gear of a gear selecting and shifting cylinder in the gear engaging process, and the inflation time of the gear shifting cylinder is controlled according to the inflation time of the cylinder obtained by query, so that the inflation time of the gear shifting cylinder is shortened, and the speed of the gear shifting actuating mechanism when reaching a limit position is reduced.

However, the control method disclosed by the motion control method and the motion control device of the AMT gear selecting and shifting executing mechanism cannot be applied to complex whole vehicle working conditions, so that the gear shifting success rate is reduced, and the method is specifically described as follows: (1) The range of the X axis and the Y axis of the preset MAP is limited, when the input of the X axis or the Y axis is not in the preset range, only the nearest value in the table can be selected or calculated by a difference method to be used as the input, so that the output is inaccurate, the gear success rate is reduced when the output cylinder inflation time is smaller, the speed of the gear shifting executing mechanism is larger when the output cylinder inflation time is larger, and the inertia of the gear shifting executing mechanism is larger when the gear shifting executing mechanism reaches the limit position; (2) When the preset MAP finishes the calibration at the rack end, the static test is carried out, and under the working conditions of ascending and descending slopes, braking and the like, the residual stress transmitted from the wheel end to the output end of the gearbox causes the resistance of the actuating mechanism to be increased in the gear engaging process, so that the output value obtained by inquiring the preset MAP is smaller, and the gear engaging failure is easy to cause; (3) With the continuous increase of operation mileage, debris such as iron fillings in gearbox oil can be continuously increased to physical properties such as stickness also can change, cause actuating mechanism to receive frictional force in the gear process and change, preset MAP does not consider this factor, leads to the gear success rate to reduce.

Therefore, there is a need for a pneumatic AMT shift control method to solve the above problems.

Disclosure of Invention

The invention aims to provide a pneumatic AMT gear-shifting control method, which can reduce the mechanical impact force and mechanical impact sound when a gear-shifting executing mechanism reaches the limit position and improve the gear-shifting success rate.

To achieve the purpose, the invention adopts the following technical scheme:

the pneumatic AMT gear engagement control method comprises the following steps:

a gear shifting instruction is received, a first preset MAP is inquired according to an initial air pressure value, an initial gear and a target gear of a gear shifting cylinder at the moment of receiving the gear shifting instruction, the basic cylinder inflation time of a gear shifting executing mechanism is determined, the gear shifting cylinder is inflated, and a working condition representation value capable of representing the movement working condition of the gear shifting executing mechanism in the gear shifting process is monitored;

circularly correcting the air charging time length of the cylinder of the gear shifting executing mechanism according to the preset interval time;

the correction of the air charging time length of the cylinder of the gear shifting executing mechanism comprises the following steps:

inquiring a second preset MAP according to the initial air pressure value, the initial gear, the target gear and the current cylinder inflation duration of the gear shifting cylinder, determining a theoretical value of a current working condition characterization value, and calculating a difference value between an actual value of the current working condition characterization value and the theoretical value of the current working condition characterization value;

Correcting the basic cylinder inflation time according to the initial gear, the target gear, the current cylinder inflation time and the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value to obtain a first corrected post cylinder inflation time for correcting the cylinder inflation time of the gear shifting executing mechanism;

the method for controlling the charging process of the gear shifting cylinder according to the result of the correction of the charging time length of the cylinder of the gear shifting executing mechanism comprises the following steps:

if the current cylinder inflation duration is smaller than the first corrected post-cylinder inflation duration corrected by the cylinder inflation duration of the gear shifting executing mechanism, continuing to inflate the gear shifting cylinder, and if the current cylinder inflation duration is not smaller than the first corrected post-cylinder inflation duration corrected by the cylinder inflation duration of the gear shifting executing mechanism, stopping inflating the gear shifting cylinder.

Preferably, the condition characteristic value is any one of a speed, a displacement and a position of the shift actuator.

Preferably, the correction is performed on the basic cylinder inflation time according to the initial gear, the target gear, the current cylinder inflation time length, and the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, so as to obtain a first corrected post cylinder inflation time length corrected by the cylinder inflation time length of the gear shifting executing mechanism, including:

Inquiring a third preset MAP according to the initial gear, the target gear, the current cylinder charging duration and the difference value between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and determining a first correction coefficient of the cylinder charging duration corrected by the cylinder charging duration of the gear shifting executing mechanism;

and correcting the basic cylinder inflation time according to a first correction coefficient of the cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism to obtain a first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism, wherein the first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism is equal to the product of the basic cylinder inflation time and the first correction coefficient corrected by the cylinder inflation time of the gear shifting executing mechanism.

Preferably, when the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value is zero, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism is equal to one, and the same gear shifting time is performed, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism increases along with the increase of the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and decreases along with the decrease of the difference.

Preferably, the method further comprises:

according to the result of correcting the cylinder inflation time length of each gear shifting executing mechanism, the basic cylinder inflation time length and the current cylinder inflation proceeding time length, judging the cylinder inflation time length correction cycle termination condition of the gear shifting executing mechanism, and comprises the following steps:

if the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is not more than the basic cylinder air-charging time length, and the current cylinder air-charging time length is not less than the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, the gear shifting executing mechanism cylinder air-charging time length correction cycle is terminated;

if the first corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism is longer than the basic cylinder air charging time length, and the current cylinder air charging time length is not shorter than the basic cylinder air charging time length, the gear shifting executing mechanism cylinder air charging time length correction cycle is terminated, and the first corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism at last time is used as the final cylinder air charging time length of the gear shifting.

The pneumatic AMT gear engagement control method comprises the following steps:

recording the failure times of the driving cycle gear engagement;

A gear shifting instruction is received, a first preset MAP is inquired according to an initial air pressure value, an initial gear and a target gear of a gear shifting cylinder at the moment of receiving the gear shifting instruction, the inflation time of a basic cylinder is determined, the gear shifting cylinder is inflated, and a working condition representation value capable of reflecting the movement working condition of a gear shifting executing mechanism in the gear shifting process is monitored;

correcting the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism according to the current gear shifting failure times of the driving cycle to obtain the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism;

if the current cylinder inflation time is smaller than the second corrected post cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism, continuing to inflate the gear shifting cylinder;

and if the current cylinder charging time is not less than the second corrected post cylinder charging time for correcting the cylinder charging time of the gear shifting executing mechanism, stopping charging the gear shifting cylinder.

Preferably, the correcting the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism according to the current gear shifting failure times of the driving cycle to obtain the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism includes:

inquiring a preset CUR according to the current gear engaging failure times of the driving cycle to obtain a second correction coefficient for correcting the cylinder inflation time length of the gear shifting executing mechanism;

and correcting the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism according to the second correction coefficient corrected by the cylinder air-charging time length of the gear shifting executing mechanism, so as to obtain the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, wherein the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is equal to the product of the second correction coefficient corrected by the cylinder air-charging time length of the gear shifting executing mechanism and the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism.

Preferably, when the number of times of the current gear-engaging failure in the driving cycle is zero, the second correction coefficient of the cylinder inflation time length correction of the gear-shifting executing mechanism is equal to one, and the second correction coefficient of the cylinder inflation time length correction of the gear-shifting executing mechanism increases along with the increase of the number of times of the current gear-engaging failure in the driving cycle.

Preferably, the method further comprises:

if the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is not more than the basic cylinder air-charging time length, and the current cylinder air-charging proceeding time length is not less than the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, the gear shifting executing mechanism cylinder air-charging time length correction cycle is terminated;

if the second corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism is longer than the basic cylinder air charging time length, and the current cylinder air charging time length is not shorter than the basic cylinder air charging time length, the cylinder air charging time length correction cycle of the gear shifting executing mechanism is terminated, and the second corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism at last time is used as the final cylinder air charging time length of the gear shifting.

The invention has the beneficial effects that:

according to the pneumatic AMT gear shifting control method, when gear shifting is carried out, the basic cylinder inflation time length of the gear shifting executing mechanism is determined through inquiring the first preset MAP, and the gear shifting executing mechanism is continuously and circularly corrected in the process that the gear shifting executing mechanism moves towards the target gear, because the difference value between the actual value of the current moment working condition representation value and the theoretical value of the current moment working condition representation value can reflect the difference value of the resistance born by the gear shifting executing mechanism in the gear shifting process and the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder inflation time length, the basic cylinder inflation time length is corrected according to the difference value between the current cylinder inflation time length and the actual value of the current moment working condition representation value and the theoretical value of the current moment working condition representation value, the obtained first corrected cylinder inflation time length is more consistent with the actual gear shifting situation, and the gear shifting success rate is improved while the mechanical impact force and mechanical impact sound when the gear shifting executing mechanism reaches the limit position is reduced.

Drawings

FIG. 1 is a flowchart of a pneumatic AMT shift control method according to an embodiment of the present invention;

FIG. 2 is a flowchart for correcting the cylinder charging time length of a gear shifting executing mechanism according to the first embodiment of the invention;

FIG. 3 is a flowchart for correcting a base cylinder charge duration according to a first embodiment of the present invention;

FIG. 4 is a flowchart for controlling a shift cylinder charging process according to the result of correction of the cylinder charging duration of each shift actuator according to an embodiment of the present invention;

FIG. 5 is a flowchart of a pneumatic AMT shift control method according to a second embodiment of the present invention;

FIG. 6 is a flowchart for correcting the air charging duration of a cylinder of a gear shifting executing mechanism according to a second embodiment of the present invention;

FIG. 7 is a flowchart for correcting a basic cylinder charge duration according to a second embodiment of the present invention;

FIG. 8 is a flowchart for correcting the first corrected post-cylinder charge duration according to the second embodiment of the present invention;

fig. 9 is a flowchart for controlling a gear shift cylinder charging process according to a result of correction of a cylinder charging time length of each gear shift actuator according to a second embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a second feature "above" or "below" a first feature may include both the second and first features being in direct contact, as well as the second and first features not being in direct contact but being in contact through additional features therebetween. Moreover, the "over", "above" and "on" a first feature includes the second feature being directly above and obliquely above the first feature, or simply indicates that the second feature is level higher than the first feature. The second feature being "under", "below" and "beneath" the first feature includes the second feature being directly under and obliquely under the first feature, or simply means that the second feature is less level than the first feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "second," "first," and the like are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

As shown in fig. 1-4, the present embodiment provides a pneumatic AMT shift control method, including:

a gear shifting instruction is received, a first preset MAP is inquired according to an initial air pressure value, an initial gear and a target gear of a gear shifting cylinder, the basic cylinder inflation time of a gear shifting executing mechanism is determined, the gear shifting cylinder is inflated, and a working condition representation value capable of reflecting the movement working condition of the gear shifting executing mechanism in the gear shifting process is monitored;

inquiring a second preset MAP according to an initial air pressure value, an initial gear, a target gear and a current cylinder inflation running time of a gear shifting cylinder at the moment of receiving a gear shifting instruction, determining a theoretical value of a working condition characterization value at the current moment, and calculating a difference value between an actual value of the working condition characterization value at the current moment and the theoretical value of the working condition characterization value at the current moment, wherein the current cylinder inflation running time is the time from the beginning of the inflation time of the gear shifting cylinder to the current moment;

the method for controlling the inflation process of the gear shifting cylinder according to the correction result of the inflation time length of the cylinder of the gear shifting executing mechanism comprises the following steps: if the current cylinder inflation time is smaller than the first corrected post cylinder inflation time for correcting the cylinder inflation time of the gear shifting executing mechanism, continuing to inflate the gear shifting cylinder; and if the current cylinder charging duration is not less than the first corrected post cylinder charging duration corrected by the cylinder charging duration of the gear shifting executing mechanism, stopping charging the gear shifting cylinder. The cylinder inflation time is the time for inflating the gear shifting cylinder, after the cylinder inflation time of a certain gear shifting executing mechanism is corrected, the obtained first corrected cylinder inflation time is smaller than or equal to the current gear shifting proceeding time, and at the moment, the inflation of the gear shifting cylinder is stopped.

The first preset MAP is obtained through a bench test, in the bench test, under a certain initial air pressure value of a gear shifting cylinder, the gear shifting actuating mechanism shifts from a certain gear to another gear, a certain gear shifting cylinder inflation time length which can meet the requirement of the gear shifting success rate is taken as a basic cylinder inflation time length, and in the embodiment, the shortest gear shifting cylinder inflation time length which can meet the requirement of the gear shifting success rate is taken as the basic cylinder inflation time length, so that the impact sound and impact force when the gear shifting actuating mechanism reaches the limit position are reduced to the greatest extent. In other embodiments, other shift cylinder inflation durations that can meet the requirement of the gear success rate may be used as the base cylinder inflation duration, for example, a shift cylinder inflation duration required when the shift actuating mechanism moves from a position corresponding to the current gear to a certain preset position is used as the base cylinder inflation duration, where the preset position is close to a position corresponding to the target gear.

According to the pneumatic AMT gear shifting control method, when gear shifting is carried out, the basic cylinder inflation time length of the gear shifting executing mechanism is determined by inquiring the first preset MAP, and in the process that the gear shifting executing mechanism moves towards a target gear, the gear shifting executing mechanism cylinder inflation time length is continuously and circularly corrected, as the difference value between the actual value of the current moment working condition representation value and the theoretical value of the current moment working condition representation value can reflect the difference value of the resistance born by the gear shifting executing mechanism in the gear shifting process and the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder inflation time length, the basic cylinder inflation time length is corrected according to the difference value between the current cylinder inflation time length and the theoretical value of the current moment working condition representation value, and compared with the basic cylinder inflation time length, the obtained first corrected cylinder inflation time length can be more consistent with the actual condition of the gear shifting, and therefore the gear shifting success rate is improved while the mechanical impact force and mechanical impact sound when the gear shifting executing mechanism reaches the limit position is reduced.

Optionally, according to the initial air pressure value, the initial gear and the target gear of the gear shifting cylinder, inquiring the first preset MAP, and determining the inflation time of the basic cylinder includes: when the initial air pressure value of the shifting air cylinder is not in the initial air pressure range described by the first preset MAP, taking the air cylinder charging duration corresponding to the air pressure value closest to the initial air pressure value of the shifting air cylinder in the first preset MAP as the basic air cylinder charging duration. The bench test cannot test the initial air pressure values of all the shifting cylinders and pre-store data on the vehicle, only the initial air pressure values of some shifting cylinders can be selected for bench test and a first preset MAP is manufactured, in this embodiment, when the initial air pressure values of the shifting cylinders are not in the initial air pressure range described by the first preset MAP, the air cylinder charging duration corresponding to the air pressure value closest to the initial air pressure value of the shifting cylinder in the first preset MAP is used as the basic air cylinder charging duration, and in other embodiments, when the initial air pressure value of the shifting cylinder is not in the initial air pressure range described by the first preset MAP, the basic air cylinder charging duration corresponding to the initial air pressure value of the shifting cylinder at the moment of the shifting command can also be obtained by adopting an interpolation calculation mode.

Optionally, the condition characteristic value is any one of a speed, a displacement, and a position of the shift actuator. After gear engagement starts, the speed, displacement and position of the gear shifting executing mechanism at a certain moment can reflect the resistance of the gear shifting executing mechanism from the gear engagement start to the current moment, so that the speed, displacement and position can be used as working condition representation values. In this embodiment, the operating mode characterizing value is a speed of the shift actuator.

Optionally, according to the initial air pressure value, the initial gear, the target gear and the current cylinder inflation duration of the gear shifting cylinder, inquiring a second preset MAP, and determining a theoretical value of a working condition representation value at the current moment, the method specifically comprises the following steps: determining a corresponding second preset MAP according to the initial gear and the target gear; inquiring a corresponding second preset MAP according to the initial air pressure value of the gear shifting cylinder and the current cylinder inflation duration, and determining a theoretical value of the working condition representation value at the current moment. In this embodiment, the second preset MAP includes a corresponding relationship between an initial air pressure value of the shift cylinder, a current cylinder charging duration, and a current theoretical speed of the shift actuator. The second preset MAP is obtained through bench test and is prestored on the vehicle, the second preset MAP is multiple, each second preset MAP corresponds to one initial gear and shifts to one target gear, for example, one second preset MAP corresponds to two gears and three gears, the other second preset MAP corresponds to one gear and three gears, each shift selection corresponds to one second preset MAP, the second preset MAP required to be called can be determined through the initial gear and the target gear, and in the second preset MAP, the theoretical value of the current moment working condition representation value can be queried through the initial air pressure value of the shifting cylinder and the current cylinder charging duration.

Optionally, correcting the basic cylinder inflation time according to the initial gear, the target gear, the current cylinder inflation time length and the difference between the actual value of the current time working condition representation value and the theoretical value of the current time working condition representation value to obtain a first corrected post cylinder inflation time length corrected by the cylinder inflation time length of the gear shifting executing mechanism, which specifically comprises: inquiring a third preset MAP according to the initial gear, the target gear, the current cylinder charging duration and the difference value between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and determining a first correction coefficient of the cylinder charging duration corrected by the cylinder charging duration of the gear shifting executing mechanism; and correcting the basic cylinder inflation time according to a first correction coefficient of the cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism to obtain a first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism, wherein the first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism is equal to the product of the basic cylinder inflation time and the first correction coefficient corrected by the cylinder inflation time of the gear shifting executing mechanism. The third preset MAP comprises a corresponding relation between the current cylinder charging duration, the difference value between the actual value of the current time working condition representation value and the theoretical value of the current time working condition representation value and the first correction coefficient of the cylinder charging duration. The third preset MAPs are obtained through bench tests and are prestored on the vehicle, the third preset MAPs are multiple, each third preset MAP corresponds to one initial gear and shifts to one target gear, for example, one third preset MAP corresponds to two gears and three gears, the other third preset MAP corresponds to one gear and three gears, each shift selection corresponds to one third preset MAP, the third preset MAPs which need to be called can be determined through the initial gear and the target gear, and in the third preset MAPs, the theoretical value of the current moment working condition characterization value can be queried through the difference value between the current cylinder charging duration and the actual value of the current moment working condition characterization value and the theoretical value of the current moment working condition characterization value.

Optionally, according to the initial gear, the target gear, the current cylinder charging duration and the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, inquiring a third preset MAP, determining a first correction coefficient of the shift actuator cylinder charging duration, and further including: and if the difference value between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value is not in the range of the difference value described by the third preset MAP, taking a correction coefficient corresponding to the difference value between the theoretical value closest to the current time working condition characterization value and the actual value of the current time working condition characterization value in the third preset MAP as a first correction coefficient of the air charging duration of the cylinder of the gear shifting executing mechanism. In other embodiments, if the difference between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value is not within the difference range described by the third preset MAP, the first correction coefficient of the cylinder charging duration corresponding to the difference between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value may also be obtained by adopting an interpolation calculation mode.

Optionally, when the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value is zero, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism is equal to one, and the same gear shifting time is performed, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism increases along with the increase of the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and decreases along with the decrease of the difference. The difference between the actual value of the working condition characterization value and the theoretical value of the working condition characterization value at the current moment at the previous moment is zero, that is, in the present gear, from the start of the gear to the current moment, the total resistance born by the gear shifting executing mechanism is the same as the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder charging time length during the bench test, so that correction is not needed, and the first correction coefficient of the cylinder charging time length is one; the difference value is a positive value, which indicates that the resistance of the gear shifting executing mechanism in the gear shifting from the start of gear shifting to the current moment is larger than the resistance of the gear shifting executing mechanism corresponding to the basic cylinder inflation time, the first correction coefficient of the cylinder inflation time is larger than one, and the larger the difference value is, the larger the first correction coefficient of the cylinder inflation time is, so that the gear shifting success rate is improved; the difference value is a negative value, which indicates that the resistance born by the gear shifting executing mechanism in the gear shifting from the start of gear shifting to the current moment is smaller than the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder inflation time length, the first correction coefficient of the cylinder inflation time length is smaller than one, and the smaller the difference value is, the smaller the first correction coefficient of the cylinder inflation time length is, so as to avoid the overlarge impact force when the gear shifting executing mechanism reaches the limit position, and the first correction coefficient of the cylinder inflation time length is required to be indicated to be always a positive value.

Optionally, the pneumatic AMT shift control method provided in this embodiment further includes: and judging the end condition of the correction cycle of the cylinder inflation time length of the gear shifting executing mechanism according to the correction result of the cylinder inflation time length of each gear shifting executing mechanism, the basic cylinder inflation time length and the current cylinder inflation proceeding time length. Judging a cycle termination condition for correcting the cylinder inflation time length of the gear shifting executing mechanism according to the result of correcting the cylinder inflation time length of each gear shifting executing mechanism, the basic cylinder inflation time length and the current cylinder inflation proceeding time length, and specifically comprising the following steps: if the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is not more than the basic cylinder air-charging time length, and the current cylinder air-charging time length is not less than the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, the gear shifting executing mechanism cylinder air-charging time length correction cycle is terminated; if the first corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism is longer than the basic cylinder air charging time length, and the current cylinder air charging time length is not shorter than the basic cylinder air charging time length, the gear shifting executing mechanism cylinder air charging time length correction cycle is terminated, and the first corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism is used as the final cylinder air charging time length of the gear shifting. When the gear shifting time exceeds the basic cylinder charging time, the gear shifting cylinder charging process of the bench test is finished, after the gear shifting time exceeds the basic cylinder charging time, the difference between the actual value of the current cylinder charging time and the actual value of the current working condition characterization value and the theoretical value of the current working condition characterization value can not accurately reflect the difference between the resistance born by the gear shifting executing mechanism and the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder charging time in the bench test, therefore, when the first correction post-cylinder charging time is longer than the basic cylinder charging time, if the current cylinder charging time is not less than the basic cylinder charging time, the gear shifting executing mechanism cylinder charging time correction cycle is terminated, and the first correction post-cylinder charging time corrected by the last gear shifting executing mechanism cylinder charging time is taken as the final cylinder charging time of the gear shifting; when the resistance of the gear shifting is not larger than the gear shifting resistance corresponding to the basic cylinder charging time length, the first corrected post cylinder charging time length is smaller than or equal to the basic cylinder charging time length, and the first corrected post cylinder charging time length corrected by the gear shifting executing mechanism cylinder charging time length can be equal to the current cylinder charging time length not smaller than the gear shifting executing mechanism cylinder charging time length.

Example two

As shown in fig. 5-9, the present embodiment provides a pneumatic AMT shift control method, including:

recording the number of times of failure in gear engagement of the driving cycle, and adding one to the statistical number of samples of the failure in gear engagement of the driving cycle if the failure in gear engagement is once in the driving cycle;

receiving a gear shifting instruction, inquiring a first preset MAP according to an initial air pressure value, an initial gear and a target gear of a gear shifting cylinder at the moment of receiving the gear shifting instruction, determining the inflation time of a basic cylinder, inflating the gear shifting cylinder, and monitoring a working condition representation value capable of reflecting the motion working condition of a gear shifting executing mechanism in the gear shifting process, wherein in the field, a pre-stored table with two inputs determining one output is generally called MAP;

Correcting the basic cylinder inflation time according to the current cylinder inflation time and the difference between the actual value of the current working condition characterization value and the theoretical value of the current working condition characterization value to obtain a first corrected cylinder inflation time for correcting the cylinder inflation time of the gear shifting executing mechanism;

if the current cylinder inflation time is smaller than the second corrected post cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism, continuing to inflate the gear shifting cylinder; and if the current cylinder charging time is not less than the second corrected post cylinder charging time for correcting the cylinder charging time of the gear shifting executing mechanism, stopping charging the gear shifting cylinder. The cylinder inflation time is the time for inflating the gear shifting cylinder, after the cylinder inflation time of a certain gear shifting executing mechanism is corrected, the obtained second corrected cylinder inflation time is smaller than or equal to the current gear shifting proceeding time, and at the moment, the inflation of the gear shifting cylinder is stopped.

According to the pneumatic AMT gear shifting control method, when gear shifting is carried out, the basic cylinder inflation time length of the gear shifting executing mechanism is determined by inquiring the first preset MAP, and in the process that the gear shifting executing mechanism moves towards a target gear, the gear shifting executing mechanism cylinder inflation time length is continuously and circularly corrected, and as the difference value between the actual value of the current moment working condition representation value and the theoretical value of the current moment working condition representation value can reflect the difference value of the resistance born by the gear shifting executing mechanism in the gear shifting process and the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder inflation time length, the basic cylinder inflation time length is corrected according to the current cylinder inflation time length and the difference value between the actual value of the current moment working condition representation value and the theoretical value of the current moment working condition representation value, and compared with the basic cylinder inflation time length, the obtained first corrected cylinder inflation time length can be more consistent with the actual condition of the gear shifting. In addition, the failure frequency of gear engagement of the driving cycle can reflect the rationality of the correction force of the air charging duration of the first correction air cylinder, and the failure frequency of gear engagement of the driving cycle is too high, which indicates that the correction force of the air charging duration of the first correction air cylinder is smaller, so that the air charging duration of the first correction air cylinder is corrected again according to the failure frequency of gear engagement of the driving cycle, and the success rate of gear engagement can be further improved.

Optionally, according to the initial air pressure value, the initial gear and the target gear of the gear shifting cylinder, inquiring the first preset MAP, and determining the inflation time of the basic cylinder includes: when the initial air pressure value of the gear shifting cylinder is not in the pre-stored data of the first preset MAP, the air cylinder charging duration corresponding to the air pressure value closest to the initial air pressure value of the gear shifting cylinder in the first preset MAP is taken as the basic air cylinder charging duration. In this embodiment, when the initial air pressure value of the shift cylinder is not in the pre-stored data of the first preset MAP, the air cylinder inflation duration corresponding to the air pressure value closest to the initial air pressure value of the shift cylinder in the first preset MAP is used as the base air cylinder inflation duration. In other embodiments, when the initial air pressure value of the shift cylinder is not in the pre-stored data of the first preset MAP, the basic cylinder inflation time corresponding to the initial air pressure value of the shift cylinder at the shift command time may also be obtained by adopting an interpolation calculation method.

Optionally, correcting the basic cylinder inflation time according to the initial gear, the target gear, the current cylinder inflation time length and a difference value between an actual value of the current time working condition representation value and a theoretical value of the current time working condition representation value to obtain a first corrected post cylinder inflation time length corrected by the cylinder inflation time length of the gear shifting executing mechanism, which specifically comprises: inquiring a third preset MAP according to the initial gear, the target gear, the current cylinder charging duration and the difference value between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and determining a first correction coefficient of the cylinder charging duration corrected by the cylinder charging duration of the gear shifting executing mechanism; and correcting the basic cylinder inflation time according to a first correction coefficient of the cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism to obtain a first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism, wherein the first corrected post-cylinder inflation time corrected by the cylinder inflation time of the gear shifting executing mechanism is equal to the product of the basic cylinder inflation time and the first correction coefficient corrected by the cylinder inflation time of the gear shifting executing mechanism. The third preset MAP comprises a corresponding relation between the current cylinder charging duration, the difference value between the actual value of the current time working condition representation value and the theoretical value of the current time working condition representation value and the first correction coefficient of the cylinder charging duration. The third preset MAPs are obtained through bench tests and are prestored on the vehicle, the third preset MAPs are multiple, each third preset MAP corresponds to one initial gear and shifts to one target gear, for example, one third preset MAP corresponds to two gears and three gears, the other third preset MAP corresponds to one gear and three gears, each shift selection corresponds to one third preset MAP, the third preset MAPs which need to be called can be determined through the initial gear and the target gear, and in the third preset MAPs, the theoretical value of the current moment working condition characterization value can be queried through the difference value between the current cylinder charging duration and the actual value of the current moment working condition characterization value and the theoretical value of the current moment working condition characterization value.

Optionally, according to the initial gear, the target gear, the current cylinder charging duration and the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, inquiring a third preset MAP, determining a first correction coefficient of the shift actuator cylinder charging duration, and further including: and if the difference value between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value is not in the range of the difference value described by the third preset MAP, taking the correction coefficient corresponding to the difference value between the theoretical value closest to the current time working condition characterization value and the actual value of the current time working condition characterization value in the third preset MAP as the first correction coefficient of the air charging duration of the cylinder of the gear shifting executing mechanism. In other embodiments, if the difference between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value is not within the difference range described by the third preset MAP, the first correction coefficient of the cylinder charging duration corresponding to the difference between the theoretical value of the current time working condition characterization value and the actual value of the current time working condition characterization value may also be obtained by adopting an interpolation calculation mode.

Optionally, when the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value is zero, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism is equal to one, and the same gear shifting time is performed, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the gear shifting executing mechanism increases along with the increase of the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value, and decreases along with the decrease of the difference. The difference between the theoretical value of the front-moment working condition characterization value and the actual value of the current-moment working condition characterization value is zero, namely, in the gear shifting, from the start of the gear shifting to the current moment, the total resistance born by the gear shifting executing mechanism is the same as the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder charging time length in the bench test, so that correction is not needed, and the first correction coefficient of the cylinder charging time length is one; the difference value is a positive value, which indicates that the resistance of the gear shifting executing mechanism in the gear shifting from the start of gear shifting to the current moment is larger than the resistance of the gear shifting executing mechanism corresponding to the basic cylinder inflation time, the first correction coefficient of the cylinder inflation time is larger than one, and the larger the difference value is, the larger the first correction coefficient of the cylinder inflation time is, so that the gear shifting success rate is improved; the difference value is a negative value, which indicates that the resistance born by the gear shifting executing mechanism in the gear shifting from the start of gear shifting to the current moment is smaller than the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder inflation time length, the first correction coefficient of the cylinder inflation time length is smaller than one, and the smaller the difference value is, the smaller the first correction coefficient of the cylinder inflation time length is, so as to avoid the overlarge impact force when the gear shifting executing mechanism reaches the limit position, and the first correction coefficient of the cylinder inflation time length is required to be indicated to be always a positive value.

Optionally, correcting the first corrected post-cylinder air-charging time length corrected by the air-charging time length of the gear shifting executing mechanism according to the current gear shifting failure times of the driving cycle to obtain the second corrected post-cylinder air-charging time length corrected by the air-charging time length of the gear shifting executing mechanism, which specifically comprises the following steps: inquiring a preset CUR according to the current gear engaging failure times of the driving cycle to obtain a second correction coefficient for correcting the cylinder inflation time length of the gear shifting executing mechanism; and correcting the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism according to the second correction coefficient corrected by the cylinder air-charging time length of the gear shifting executing mechanism, so as to obtain the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, wherein the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is equal to the product of the second correction coefficient corrected by the cylinder air-charging time length of the gear shifting executing mechanism and the first corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism. The preset CUR comprises a corresponding relation between the number of gear failure times and the second correction coefficient, and is obtained through a bench test and pre-stored on the vehicle. It should be noted that, in the art, a pre-stored data table in which one input determines one output is generally referred to as a CUR.

Optionally, when the number of times of the current gear-engaging failure in the driving cycle is zero, the second correction coefficient of the cylinder inflation time length correction of the gear-shifting executing mechanism is equal to one, and the second correction coefficient of the cylinder inflation time length correction of the gear-shifting executing mechanism increases along with the increase of the number of times of the current gear-engaging failure in the driving cycle.

Optionally, the pneumatic AMT shift control method provided in this embodiment further includes: and judging the end condition of the correction cycle of the cylinder inflation time length of the gear shifting executing mechanism according to the correction result of the cylinder inflation time length of each gear shifting executing mechanism, the basic cylinder inflation time length and the current cylinder inflation proceeding time length. Judging a cycle termination condition for correcting the cylinder inflation time length of the gear shifting executing mechanism according to the result of correcting the cylinder inflation time length of each gear shifting executing mechanism, the basic cylinder inflation time length and the current cylinder inflation proceeding time length, and specifically comprising the following steps: if the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism is not more than the basic cylinder air-charging time length, and the current cylinder air-charging proceeding time length is not less than the second corrected post-cylinder air-charging time length corrected by the cylinder air-charging time length of the gear shifting executing mechanism, the gear shifting executing mechanism cylinder air-charging time length correction cycle is terminated; if the second corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism is longer than the basic cylinder air charging time length, and the current cylinder air charging time length is not shorter than the basic cylinder air charging time length, the cylinder air charging time length correction cycle of the gear shifting executing mechanism is terminated, and the second corrected post-cylinder air charging time length corrected by the cylinder air charging time length of the gear shifting executing mechanism at last time is used as the final cylinder air charging time length of the gear shifting. When the gear shifting time exceeds the basic cylinder charging time, the gear shifting cylinder charging process of the bench test is finished, after the gear shifting time exceeds the basic cylinder charging time, the difference between the actual value of the current cylinder charging time and the actual value of the current working condition characterization value and the theoretical value of the current working condition characterization value can not accurately reflect the difference between the resistance born by the gear shifting executing mechanism and the resistance born by the gear shifting executing mechanism corresponding to the basic cylinder charging time in the bench test, therefore, when the second correction post-cylinder charging time is longer than the basic cylinder charging time, if the current cylinder charging time is not less than the basic cylinder charging time, the gear shifting executing mechanism cylinder charging time correction cycle is terminated, and the second correction post-cylinder charging time corrected by the last gear shifting executing mechanism cylinder charging time is taken as the final cylinder charging time of the gear shifting; and when the second corrected post-cylinder inflation time length is less than or equal to the basic cylinder inflation time length, the time when the current cylinder inflation time length is not less than the second corrected post-cylinder inflation time length corrected by the cylinder inflation time length of the gear shifting executing mechanism can be reached, and the gear shifting executing mechanism cylinder inflation time length correction cycle is terminated again.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The pneumatic AMT gear engagement control method is characterized by comprising the following steps of:

2. The pneumatic AMT shift control method of claim 1, wherein the condition characterization value is any one of a speed, a displacement and a position of the shift actuator.

3. The pneumatic AMT shift control method as claimed in claim 1, wherein correcting the basic cylinder charging time length according to the initial gear, the target gear, the current cylinder charging time length and the difference between the actual value of the current time working condition characterization value and the theoretical value of the current time working condition characterization value to obtain the first corrected post cylinder charging time length corrected by the current gear shifting executing mechanism cylinder charging time length comprises:

4. The pneumatic AMT shift control method as claimed in claim 3, wherein when the difference between the actual value of the current operating condition characteristic value and the theoretical value of the current operating condition characteristic value is zero, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the shift actuator is equal to one, and the same shift running time, the first correction coefficient of the cylinder charging time length corrected by the cylinder charging time length of the shift actuator increases and decreases with the increase of the difference between the actual value of the current operating condition characteristic value and the theoretical value of the current operating condition characteristic value.

5. The pneumatic AMT shift control method as claimed in claim 1, further comprising:

6. The pneumatic AMT gear engagement control method is characterized by comprising the following steps of:

Recording the failure times of the driving cycle gear engagement;

7. The pneumatic AMT shift control method of claim 6, wherein correcting the basic cylinder charging time period according to the initial gear, the target gear, the current cylinder charging time period and the difference between the actual value of the current time condition characterization value and the theoretical value of the current time condition characterization value to obtain the first corrected post cylinder charging time period for correcting the cylinder charging time period of the present shift actuator comprises:

8. The method for controlling a shift in a pneumatic AMT according to claim 6, wherein correcting the first corrected post-cylinder air-charging time length corrected for the cylinder air-charging time length of the shift actuator according to the number of current shift failures in the driving cycle to obtain the second corrected post-cylinder air-charging time length corrected for the cylinder air-charging time length of the shift actuator, comprises:

9. The pneumatic AMT shift control method according to claim 8, characterized in that the second correction coefficient of the cylinder charging time length correction of the present shift actuator is equal to one when the number of the present shift failure times is zero, and the second correction coefficient of the cylinder charging time length correction of the present shift actuator increases with the increase of the present failure times of the present shift cycle.

10. The pneumatic AMT shift control method as claimed in claim 6, further comprising: