WO2013026278A1

WO2013026278A1 - Engineering machinery with hydro-mechanical transmission system and its shifting control system and method

Info

Publication number: WO2013026278A1
Application number: PCT/CN2012/073885
Authority: WO
Inventors: 林涛; 谢金龙; 肖峰
Original assignee: 湖南三一智能控制设备有限公司; 三一重工股份有限公司
Priority date: 2011-08-23
Filing date: 2012-04-12
Publication date: 2013-02-28
Also published as: CN102338215A

Abstract

A shifting control method for an engineering machinery with a hydro-mechanical transmission system, includes: firstly, sending a shifting command; secondly, separating a driving disk connected with a driving motor from a first driven disk corresponding to current gear in a gearbox; then calculating the rotational speed n1 of a second driven disk corresponding to the target gear; finally, adjusting the output rotational speed of the driving motor and making it close to the rotational speed n1 of the second driven disk, engaging the said driving disk and the second driven disk completely when the absolute value of the difference between the rotational speed n0 of the driving disk and the rotational speed n1 of the second driven disk is less than a predetermined value, the shifting operation is achieved. The shifting collision is reduced, the stabilization and shifting quality during the shifting process are increased and the service life of the driving disk and the driven disk are prolonged. Also disclosed are a shifting control system corresponding to the said shifting control method and the engineering machinery with a hydro-mechanical transmission including the shifting system.

Description

- Mechanical transmission engineering machinery and shift control system and method thereof

This application is filed on August 23, 201, in the Chinese Patent Office, and the application number is 201110242282. 2. The priority of the Chinese patent application titled "Hydraulic-mechanical transmission engineering machinery and its shift control system and method" The entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to the field of construction machinery, and more particularly to a hydraulic-mechanical transmission engineering machine and a shift control system and method thereof.

Background technique

The power transmission methods of construction machinery usually include hydraulic transmission, mechanical transmission and hydraulic-mechanical transmission. Among them, the hydraulic-mechanical transmission control system is a common transmission mode for heavy construction machinery, and its power transmission route is usually: engine-hydraulic pump-drive motor-transmission bridge-drive wheel.

The heavy-duty construction machinery of the existing hydraulic-mechanical transmission control system usually adopts the traditional shifting method when performing the shifting operation, that is, according to the following steps: In the first step, the driver operates the relevant operating device to issue a shifting command; In the second step, the driving disc connected to the output end of the driving motor in the gearbox is disengaged from the first driven disc corresponding to the current gear position; in the third step, the driving disc is engaged with the second driven disc corresponding to the target gear position, The block operation is completed. This sequence of operation can be achieved by switching the high-speed gear to the low-speed gear, or switching the low-speed gear to the high-speed gear to ensure that the construction machinery travels at the actual speed required.

During the above shifting process, whether the high speed gear shifts to the low speed gear position or the low speed gear shifts to the high speed gear position, the drive disc is completely engaged with the second driven disc after being disengaged from the first driven disc. During the time period, the rotational speed ηθ is still equal to the rotational speed nl of the first driven disk, and the rotational speed is different from the n2 of the second driven disk rotational speed, so that the two gears with different rotational speeds mesh with each other, which will generate a larger The impact force causes the shifting process to be uneven, which seriously affects the shift quality and the quality of the engineering work of the construction machinery.

In view of this, it is urgent to optimize the design of the existing shift control system and method for the above technical problems, so that the impact force generated during the shifting process is small, the stability of the shifting process is enhanced, and the shift quality is improved. The quality of work of construction machinery.

Summary of the invention

The technical problem to be solved by the present invention is to provide a construction machine for hydraulic-mechanical transmission The shift control method makes the shifting process of the construction machinery produce a small impact force, thereby enhancing the stability of the shifting process, improving the shift quality and the work quality of the construction machine. Another technical problem to be solved by the present invention is to provide a shift control system for a hydraulic-mechanical transmission engineering machine, and a hydraulic-mechanical transmission engineering machine including the shift control system.

In order to solve the above technical problems, the present invention provides a shift control method for a hydraulic-mechanical transmission engineering machine, comprising the following steps:

1) issue a shift command;

2) disengaging the driving disc connected to the driving motor in the transmission from the first driven disc corresponding to the current gear position;

3) obtaining the rotation speed nl of the second driven disk corresponding to the target gear;

4) adjusting the output rotational speed of the drive motor to approach the rotational speed nl of the second driven disk; 5) determining the difference between the current rotational speed ηθ of the drive disk and the rotational speed nl of the second driven disk Whether the absolute value is less than a predetermined value, and if so, the drive disc and the second driven disc are fully engaged to complete the shifting operation; if not, proceed to step 4).

Preferably, the step 4) engages the drive disc and the second driven disc portion while adjusting the output rotational speed of the drive motor to approach the rotational speed nl of the second driven disc.

Preferably, the predetermined value ranges from 50 r/min to 150 r/min.

Preferably, the predetermined value is specifically 100 r/min.

The invention provides a shift control method for a hydraulic-mechanical transmission engineering machine, comprising the following steps: First, a shift command is issued; secondly, a drive disc connected to the drive motor in the gearbox and corresponding to the current gear position The first driven disk is disengaged; then, the rotational speed nl of the second driven disk corresponding to the target gear is calculated; finally, the output rotational speed of the driving motor is adjusted to approach the rotational speed nl of the second driven disk to determine the driving disk Whether the absolute value of the difference between the current rotational speed ηθ and the rotational speed nl of the second driven disk is less than a predetermined value, and if so, the drive disk and the second driven disk are fully engaged to complete the shifting operation; if not, proceed to step 4 ).

In this method, when the high speed gear shifts to the low speed gear position, that is, before the drive motor adjusts the speed, when the drive disk rotational speed ηθ connected to the drive motor is greater than the rotational speed n1 of the second driven disk corresponding to the target gear position, the adjustment is performed. The driving disk speed ηθ is continuously reduced until nO - nl is less than a predetermined value, and the driving disk and the second driven disk are meshed to complete the shifting; when the low speed gear is switched to the high speed gear, that is, before the driving motor adjusts the speed When the rotational speed ηθ is less than nl, the driving disk rotational speed ηθ is adjusted to keep it constant Increasing, until nl - nO is less than the predetermined value, the driving disk and the second driven disk are engaged to complete the shifting. In summary, when the driving disc is engaged with the second driven disc during the shifting process, the rotational speeds of the two are similar, and the impact forces generated by the two gears with similar rotational speeds are small.

It can be seen that, compared with the conventional shift control method, the shift control method provided by the present invention reduces the shift shock, enhances the smoothness of the shifting process, improves the shift quality and the work quality of the construction machine, and The service life of the drive plate and each driven disk is enhanced.

The invention also provides a shift control system for a hydraulic-mechanical transmission engineering machine, comprising an information acquisition unit and a control unit,

The information acquiring unit is configured to acquire a rotation speed n1 of the second driven disk corresponding to the target gear; the control unit is configured to adjust an output rotation speed of the driving motor to be close to the rotation speed n1 of the second driven disk; And determining whether the absolute value of the difference between the current rotational speed ηθ of the driving disk and the rotational speed n1 of the second driven disk is less than a predetermined value, and if so, engaging the driving disk and the second driven disk to complete The shifting operation, if not, continues to adjust the output speed of the drive motor.

Preferably, the controller engages the drive disc and the second driven disc portion while adjusting the output rotational speed of the drive motor to approach the rotational speed nl of the second driven disc.

Preferably, the predetermined value ranges from 50 r/min to 150 r/min.

Preferably, the predetermined value is specifically 100 r/min.

The present invention also provides a hydraulic-mechanical transmission engineering machine comprising an engine, a hydraulic pump, a drive motor and a gearbox that are sequentially connected; and a shift control system as described above.

Since the shift control method has the above technical effects, the shift control system corresponding to the shift control method also has the same technical effect, and the hydraulic-mechanical transmission engineering machine including the shift system also has corresponding Technical effects will not be described here.

DRAWINGS

1 is a schematic structural view of a specific embodiment of a shift control method provided by the present invention;

2 is a schematic structural view of another specific embodiment of a shift control method provided by the present invention;

Fig. 3 is a schematic structural view showing a specific embodiment of a shift control system provided by the present invention.

detailed description The core of the invention is to provide a shift control method for a hydraulic-mechanical transmission engineering machine, which makes the shifting process of the construction machine generate a small impact force, thereby enhancing the stability of the shifting process and improving Shift quality and work quality of construction machinery. Another core of the present invention is to provide a shift control system for a hydraulic-mechanical transmission engineering machine and a hydraulic-mechanical transmission engineering machine including the shift control system.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a specific implementation manner of a shift control method according to the present invention.

In a specific embodiment, the shift control method of the construction machine for hydraulic-mechanical transmission provided by the present invention mainly comprises the following steps:

S11: issuing a shift command;

S12: disengaging the driving disk connected to the driving motor in the transmission from the first driven disk corresponding to the current gear position;

S13: Obtain a rotation speed nl of the second driven disk corresponding to the target gear;

S14: adjusting the output rotation speed of the driving motor to approach the rotation speed n1 of the second driven disc; S15: determining whether the absolute value of the difference between the current rotation speed ηθ of the driving disc and the rotation speed n1 of the second driven disc is less than a predetermined value. If yes, the drive disc and the second driven disc are fully engaged to complete the shifting operation; if not, proceed to step S14.

In this method, when the high speed gear shifts to the low speed gear position, that is, before the drive motor adjusts the speed, when the drive disk rotational speed ηθ connected to the drive motor is greater than the rotational speed n1 of the second driven disk corresponding to the target gear position, the adjustment is performed. The driving disk speed ηθ is continuously reduced until nO - nl is less than a predetermined value, and the driving disk and the second driven disk are meshed to complete the shifting; when the low speed gear is switched to the high speed gear, that is, before the driving motor adjusts the speed When the rotational speed ηθ is less than nl, the driving disk rotational speed ηθ is adjusted to be continuously increased until nl - nO is less than a predetermined value, and the driving disk and the second driven disk are engaged to complete the shifting. In summary, when the drive disc is engaged with the second driven disc during the shifting process, the rotational speeds of the two are not much different, and the impact forces generated by the two gears with similar rotational speeds are small.

It can be seen that, compared with the conventional shift control method, the shift control method provided by the present invention reduces the shift shock, enhances the smoothness of the shifting process, improves the shift quality and the work quality of the construction machine, and The service life of the drive plate and each driven disk is enhanced. In fact, as long as the output speed of the drive motor is adjusted to be close to the rotational speed of the second driven disc, and then the drive disc and the second driven disc are engaged, the shift control method for reducing the impact force of the shifting process is All should fall within the scope of protection of the present invention.

It is also possible to further set the specific operational steps of the above shift control method.

Please refer to FIG. 2. FIG. 2 is a schematic structural diagram of another specific implementation manner of a shift control method according to the present invention.

In another embodiment, as shown in FIG. 2, the shift control method provided by the present invention may further include the following steps:

S21: issuing a shift command;

S22: Disengage the driving disk connected to the driving motor in the transmission from the first driven disk corresponding to the current gear position;

S23: Acquire a rotation speed nl of the second driven disk corresponding to the target gear;

S24: adjusting an output speed of the driving motor to approach the rotation speed nl of the second driven disk; engaging the driving disk and the second driven disk portion;

S25: determining whether the absolute value of the difference between the current rotational speed ηθ of the driving disk and the rotational speed nl of the second driven disk is less than a predetermined value, and if so, fully engaging the driving disk and the second driven disk to complete the shifting operation; Then proceed to step S24.

In this method, while the output rotational speed of the drive motor is adjusted, the drive disc and the second driven disc portion are meshed, and as the drive disc rotational speed ηθ and the second driven disc rotational speed nl gradually approach, the two are meshed by the addendum. Gradually meshing with the root until the rotational speed ηθ of the drive plate and the rotational speed of the second driven disk n1 approach a predetermined range, the drive disk and the second driven disk are fully engaged. This method not only has the technical effect of reducing the shifting impact force, but also has the advantages of saving time and improving shifting efficiency.

It is also possible to further set a specific numerical range of the above predetermined value.

In a further aspect, the predetermined value in the above shift control method ranges from 50 r/min.

~150r/min, specifically, the predetermined value may be 100r/min. After many tests, it is proved that the selection of the numerical range can ensure that the shifting process time is small, and the shifting impact can be guaranteed within the allowable range of the design; if it is larger than this range, the shifting impact is larger, if it is smaller than this The value is longer, the shifting time is longer, and the shifting efficiency is lower.

Please refer to FIG. 3 , which is a specific implementation manner of a shift control system provided by the present invention. Schematic diagram of the structure.

As shown in FIG. 3, the present invention further provides a shift control system for a hydraulic-mechanical transmission engineering machine, comprising an information acquisition unit and a control unit, wherein the information acquisition unit is configured to issue a shift command and After the driving disk in the gearbox and the first driven disk corresponding to the current gear position are disengaged, the rotation speed nl of the second driven disk corresponding to the target gear is obtained; the control unit is configured to adjust the output rotation speed of the driving motor to The rotation speed nl of the second driven disk is close to; and determining whether the absolute value of the difference between the current rotational speed ηθ of the driving disk and the rotational speed nl of the second driven disk is less than a predetermined value, and if so, engaging the driving disk with the second driven disk , Complete the shifting operation, if not, continue to adjust the output speed of the drive motor.

In a specific solution, the controller adjusts the output rotational speed of the drive motor to bring the drive disc and the second driven disc portion into engagement while approaching the rotational speed nl of the second driven disc.

Further, the predetermined value ranges from 50 r/min to 150 r/min. Specifically, the predetermined value may be specifically 100 r/min.

The above is a detailed description of a hydraulic-mechanical transmission engineering machine and its shift control system and method provided by the present invention. The principles and embodiments of the present invention have been described herein with reference to specific examples. The description of the above embodiments is only to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

Rights request

A shift control method for a hydraulic-mechanical transmission engineering machine, comprising the steps of:

1) issue a shift command;

2. The shift control method for a hydraulic-mechanical transmission engineering machine according to claim 1, wherein said step 4) adjusts an output rotational speed of said drive motor to a second driven disk The driving disk and the second driven disk portion are meshed while the rotational speed n1 is approaching.

A shift control method for a hydraulic-mechanical transmission engineering machine according to claim 2, wherein said predetermined value ranges from 50 r/min to 150 r/min.

A shift control method for a hydraulic-mechanical transmission engineering machine according to claim 3, wherein said predetermined value is specifically 100 r/min.

5. A shift control system for a hydraulic-mechanical transmission engineering machine, characterized in that it comprises an information acquisition unit and a control unit,

The information acquiring unit is configured to acquire a rotation speed n1 of the second driven disk corresponding to the target gear; the control unit is configured to adjust an output rotation speed of the driving motor to approach the rotation speed n1 of the second driven disk; And determining whether the absolute value of the difference between the current rotational speed ηθ of the driving disk and the rotational speed n1 of the second driven disk is less than a predetermined value, and if so, engaging the driving disk and the second driven disk to complete The shifting operation, if not, continues to adjust the output speed of the drive motor.

A shifting control system for a hydraulic-mechanical transmission engineering machine according to claim 5, wherein said controller adjusts an output rotational speed of said drive motor to a rotational speed nl of said second driven disk The drive disc and the second driven disc portion are engaged while being brought close.

7. The shifting control system for a hydraulic-mechanical transmission engineering machine according to claim 6, The predetermined value ranges from 50 r/min to 150 r/min.

A shift control system for a hydraulic-mechanical transmission engineering machine according to claim 7, wherein said predetermined value is specifically 100 r/min.

A hydraulic-mechanical transmission engineering machine comprising an engine, a hydraulic pump, a drive motor and a gearbox, which are sequentially connected, and characterized in that it further comprises a shift control system according to any one of claims 5-8.