阅读说明：本技术 一种amt变速箱换档控制系统和控制方法 (Gear shifting control system and control method for AMT (automated mechanical transmission) ) 是由 陈超 袁涛 李晓林 牛学臣 于 2020-12-25 设计创作，主要内容包括：本发明提供了一种AMT变速箱换档控制系统和控制方法,系统包括电磁制动器和依次连接的发动机、离合总成、发动机输出轴、付变速箱和AMT变速箱,付变速箱包括单向离合器和变速箱输入轴,发动机输出轴共转动地连接变速箱输入轴或者通过单向离合器连接变速箱输入轴。AMT变速箱需要升档或强制降档时,先将发动机输出轴通过单向离合器连接变速箱输入轴,然后再进行换档操作,换档操作过程中,离合总成的离合器保持闭合状态,升档的换档过程通过电磁制动器辅助调节发动机曲轴的转速。本发明消除了传统AMT变速箱换档时动力中断引起的顿挫感,极大缩短AMT变速箱换档动力中断时间,提高换档速度,提升驾驶舒适性。(The invention provides a gear shifting control system and a gear shifting control method for an AMT (automated mechanical transmission), wherein the gear shifting control system comprises an electromagnetic brake, and an engine, a clutch assembly, an engine output shaft, a secondary gearbox and an AMT gearbox which are sequentially connected, the secondary gearbox comprises a one-way clutch and a gearbox input shaft, and the engine output shaft is connected with the gearbox input shaft in a co-rotating manner or is connected with the gearbox input shaft through the one-way clutch. When the AMT gearbox needs to be shifted up or shifted down forcibly, an output shaft of an engine is connected with an input shaft of the gearbox through a one-way clutch, then gear shifting operation is carried out, in the gear shifting operation process, the clutch of a clutch assembly is kept in a closed state, and the rotating speed of a crankshaft of the engine is adjusted in an assisting mode through an electromagnetic brake in the gear shifting process of shifting up. The invention eliminates the pause and frustration caused by power interruption when the traditional AMT gearbox shifts gears, greatly shortens the gear shifting power interruption time of the AMT gearbox, improves the gear shifting speed and improves the driving comfort.)

1. An AMT gearbox gear shift control system is characterized in that: the electromagnetic clutch comprises an electromagnetic brake (5), an engine (1), a clutch assembly (2), an engine output shaft (11), a sub gearbox (3) and an AMT gearbox (4) which are sequentially connected, wherein the power of the engine (1) is sequentially transmitted to wheels through the clutch assembly (2), the engine output shaft (11), the sub gearbox (3) and the AMT gearbox (4), the clutch assembly (2) comprises a clutch, the sub gearbox (3) comprises a one-way clutch (32) and a gearbox input shaft (31), a movable gear ring (33) used for activating and locking the state of the one-way clutch (32), a driving motor (34) and a position sensor (35), the engine output shaft (11) is connected with the gearbox input shaft (31) in a co-rotating manner or is connected with the gearbox input shaft (31) through the one-way clutch (32), and an acting force in a direction opposite to the rotating direction of a crankshaft is generated between the electromagnetic brake (5) and the crankshaft of the engine (, the force is not constant.

2. The system of claim 3, wherein: electromagnetic braking ware (5) are including electromagnetism fixing base (51) and brake sucking disc (52), and electromagnetism fixing base (51) are fixed with the shell of engine (1), and brake sucking disc (52) link to each other and move jointly with the bent axle of engine (1), and when electromagnetism fixing base (51) circular telegram produced the electromagnetic field, brake sucking disc (52) receive electromagnetic attraction and laminate with electromagnetism fixing base (51) and produce frictional force, make the bent axle receive friction torque.

3. The system of claim 2, wherein: one end of the engine output shaft (11) far away from the crankshaft is connected with an outer ring of a one-way clutch (32), and an inner ring of the one-way clutch (32) is connected with a gearbox input shaft (31).

4. The system of claim 9, wherein: the information received by the controller comprises information sent by a position sensor (35), information of an accelerator and a brake, information of a gear, and information of torque and rotating speed of the automobile, and the actions of the terminal components comprise the movement of a movable gear ring (33), the closing and the opening of a clutch assembly (2), the torque reduction and the torque increase of an engine (1), gear shifting, the electrification and the outage of an electromagnetic fixed seat (51), and electrification voltage and electrification time.

5. A gear shifting control method of an AMT gearbox is based on the control system of any one of claims 1-10, and is characterized in that: when the AMT gearbox (4) needs to be shifted up or shifted down forcibly, the one-way clutch (32) is activated firstly, the engine output shaft (11) is connected with the gearbox input shaft (31) through the one-way clutch (32), then gear shifting operation is carried out, in the gear shifting operation process, the clutch of the clutch assembly (2) is kept in a closed state, and in the gear shifting process of shifting up, the rotating speed of a crankshaft of the engine (1) is adjusted in an auxiliary mode through the electromagnetic brake (5).

6. The control method according to claim 11, characterized in that: the gear shifting process of the gear shifting up comprises the following steps: the method comprises the steps of firstly reducing the torque of an engine and simultaneously activating a one-way clutch (32), then shifting and simultaneously electrifying an electromagnetic brake (5) for starting, when the rotating speed of the engine reaches a set range, powering off the electromagnetic brake (5), and finally sequentially shifting, increasing the torque of the engine and locking the one-way clutch (32).

7. The control method according to claim 11, characterized in that: the shift process of the kick-down includes the following steps performed in sequence: the method comprises the steps of firstly reducing the torque of the engine, simultaneously activating the one-way clutch (32), and then sequentially removing a gear, engaging the gear, increasing the torque of the engine and locking the one-way clutch (32).

8. The control method according to claim 11, characterized in that: the AMT gearbox (4) needs to shift down in the sliding process, the one-way clutch (32) is locked firstly in the sliding process, and then the gear shifting operation is carried out through the clutch separation and closing of the clutch assembly (2).

9. The control method according to claim 14, characterized in that: the shift process of downshifting during coasting is: firstly, the engine reduces the torque and the clutch of the clutch assembly (2) is separated; then sequentially picking and engaging a gear; finally, the clutch of the clutch assembly (2) is closed while the engine is increasing torque.

10. The control method according to any one of claims 12 to 17, characterized in that: activating the one-way clutch (32) means: the movable gear ring (33) is separated from the connection with the outer ring of the one-way clutch (32), and the power of the engine output shaft (11) is transmitted to the gearbox input shaft (31) through the outer ring and the inner ring of the one-way clutch (32) in sequence; the locking of the one-way clutch (32) means that the movable gear ring (33) is connected with the outer ring of the one-way clutch (32) and the transmission input shaft (31), and the power of the engine output shaft (11) is transmitted to the transmission input shaft (31) through the outer ring of the one-way clutch (32) and the movable gear ring (33) in sequence.

Technical Field

The invention relates to the technical field of automobile power, in particular to a gear shifting control system and a control method for an AMT (automated mechanical transmission).

Background

During the upshifting or downshifting of the automobile, the clutch needs to be separated or disconnected firstly, then the operations of gear shifting and gear engaging are carried out, and the clutch is closed after the gear engaging is finished, so that the power can be transmitted to the wheels through the clutch. The above process may have a power interruption process due to the disengagement of the clutch, and the longer the power interruption process, the more the drivability and driving comfort of the vehicle are affected.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a gear shifting control system and a control method for an AMT (automated mechanical transmission), which eliminate the jerking feeling caused by power interruption during gear shifting of the traditional AMT, assist in speed reduction through an electromagnetic brake during gear shifting, reduce the power interruption time by 30% compared with a gearbox with only a one-way clutch, reduce the gear shifting power interruption time by 30% -40% compared with the traditional AMT gearbox, greatly shorten the gear shifting power interruption time of the AMT gearbox, improve the gear shifting speed and improve the driving comfort.

In order to achieve the purpose, the invention adopts the technical scheme that:

a gear shifting control system of an AMT (automated mechanical transmission) comprises an electromagnetic brake, and an engine, a clutch assembly, an engine output shaft, a sub-gearbox and an AMT (automated mechanical transmission) which are sequentially connected, wherein the power of the engine is sequentially transmitted to wheels through the clutch assembly, the engine output shaft, the sub-gearbox and the AMT gearbox, the clutch assembly comprises a clutch, the sub-gearbox comprises a one-way clutch and a gearbox input shaft, the engine output shaft is connected with the gearbox input shaft in a co-rotating mode or is connected with the gearbox input shaft through the one-way clutch, an acting force in the direction opposite to the rotating direction of a crankshaft is generated between the electromagnetic brake and the crankshaft of the engine after.

As a further improvement of the above technical solution:

one end of the engine output shaft is connected with one end of the crankshaft, and the other end of the engine output shaft is connected with the gearbox input shaft in a co-rotating mode or connected with the gearbox input shaft through a one-way clutch.

And an electromagnetic brake is arranged at one end of the crankshaft, which is far away from the clutch assembly.

Electromagnetic braking ware includes electromagnetism fixing base and braking sucking disc, and electromagnetism fixing base is fixed with the shell of engine, and the braking sucking disc links to each other and moves with the crankshaft of engine jointly, and when electromagnetism fixing base circular telegram produced the electromagnetic field, the braking sucking disc received the electromagnetic attraction and produces frictional force with the laminating of electromagnetism fixing base, makes the crankshaft receive friction torque.

One end of the output shaft of the engine, which is far away from the crankshaft, is connected with the outer ring of the one-way clutch, and the inner ring of the one-way clutch is connected with the input shaft of the gearbox.

The auxiliary gearbox also comprises a movable gear ring, one end of the movable gear ring is connected with the input shaft of the gearbox, and the other end of the movable gear ring is detachably connected with the outer ring of the one-way clutch.

The auxiliary gearbox also comprises a driving motor which is connected with and drives the movable gear ring to move.

The auxiliary gearbox also comprises a position sensor, and the position sensor is used for sensing the position of the movable gear ring.

The system also includes a controller that receives the information and controls the actuation of the components of the terminal based on the received information.

The information received by the controller comprises information sent by a position sensor, information of an accelerator and a brake, information of a gear, and information of torque and rotating speed of an automobile, and the action of the terminal part comprises the movement of a movable gear ring so as to realize the locking and the activation of a one-way clutch, the closing and the separation of a clutch assembly, the torque reduction and the torque increase of an engine, the gear shifting, the electrification and the outage of an electromagnetic fixed seat, and electrification voltage and electrification time.

Based on the control system, when the AMT gearbox needs to be shifted up or shifted down forcibly, an engine output shaft is connected with a gearbox input shaft through a one-way clutch, namely the one-way clutch is activated, then gear shifting operation is carried out, in the gear shifting operation process, the clutch of a clutch assembly is kept in a closed state, and in the gear shifting process of shifting up, the rotating speed of an engine crankshaft is adjusted in an auxiliary mode through an electromagnetic brake.

The gear shifting process of the gear shifting up comprises the following steps: the method comprises the steps of firstly reducing the torque of an engine and simultaneously activating a one-way clutch, then gear shifting and simultaneously electrifying an electromagnetic brake for starting, when the rotating speed of the engine reaches a set range, powering off the electromagnetic brake, and finally sequentially shifting, increasing the torque of the engine and locking the one-way clutch.

The shift process of the kick-down includes the following steps performed in sequence: the method comprises the steps of firstly reducing the torque of an engine and simultaneously activating a one-way clutch, and then sequentially removing a gear, engaging the gear, increasing the torque of the engine and locking the one-way clutch.

When the AMT gearbox needs to downshift in the vehicle sliding process, the movable gear ring in the sliding state is moved to the state that the engine output shaft and the gearbox input shaft are connected in a co-rotating mode, the clutch of the clutch assembly needs to be separated, and then gear shifting operation is carried out.

The shift process for the coast downshift is: firstly, reducing the torque of an engine and separating a clutch of a clutch assembly at the same time; then sequentially picking and engaging a gear; finally, the clutch of the clutch assembly is closed while the engine is increasing torque.

And the controller judges whether the AMT gearbox needs to be shifted up, forced shifted down or slid shifted down according to the received information of the brake and the accelerator, the vehicle speed information and the gear information.

Activating the one-way clutch means: the movable gear ring is separated from the connection with the outer ring of the one-way clutch, and the power of the output shaft of the engine is transmitted to the input shaft of the gearbox through the outer ring and the inner ring of the one-way clutch in sequence; the locking of the one-way clutch means that the movable gear ring is connected with the outer ring of the one-way clutch and the input shaft of the gearbox, and the power of the output shaft of the engine is transmitted to the input shaft of the gearbox through the outer ring of the one-way clutch and the movable gear ring in sequence.

The controller controls the driving motor to drive the movable gear ring to move.

The invention has the beneficial effects that: the gear-shifting device has the advantages that the jerking feeling caused by power interruption during gear shifting of the traditional AMT gearbox is eliminated, the engine is decelerated through the electromagnetic brake during gear shifting, the power interruption time is reduced by 30% compared with the AMT gearbox only provided with the one-way clutch, the gear shifting is reduced by 30% -40% compared with the traditional AMT gearbox, the gear shifting power interruption time of the AMT gearbox is greatly shortened, the gear shifting speed is increased, and the driving comfort is improved.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a flow chart of a control method according to an embodiment of the present invention;

FIG. 3 is a graph showing the variation trend of various parameters during an upshift process according to the present invention;

FIG. 4 is a graph showing the trend of the various parameters during a kick-down according to the present invention;

FIG. 5 is a graph showing the trend of the parameters during a coast downshift according to the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

A gear shifting control system of an AMT gearbox is shown in figure 1 and comprises an electromagnetic brake 5, an engine 1, a clutch assembly 2, an engine output shaft 11, a sub gearbox 3, an AMT gearbox 4 and a controller which are sequentially connected, wherein power of the engine 1 is transmitted to wheels sequentially through the clutch assembly 2, the engine output shaft 11, the sub gearbox 3 and the AMT gearbox 4.

One end of a crankshaft of the engine 1 is connected with the clutch assembly 2, and the other end is provided with an electromagnetic brake 5.

The clutch assembly 2 includes a clutch.

The auxiliary gearbox 3 comprises a one-way clutch 32, a gearbox input shaft 31, a movable gear ring 33, a driving motor 34 and a position sensor 35. One end of the engine output shaft 11 is connected with one end of the crankshaft, and the other end of the engine output shaft 11 is co-rotatably connected with the gearbox input shaft 31 or connected with the gearbox input shaft 31 through the one-way clutch 32. One end of the engine output shaft 11 far away from the crankshaft is connected with an outer ring of a one-way clutch 32, and an inner ring of the one-way clutch 32 is connected with a transmission input shaft 31. When the rotating speed of the outer ring is greater than that of the inner ring, the outer ring can drive the inner ring to synchronously rotate, and when the rotating speed of the inner ring is greater than that of the outer ring, the inner ring cannot drive the outer ring to synchronously rotate.

The movable ring gear 33 is co-rotatably connected with the gearbox input shaft 31 by splines and is axially movable along the gearbox input shaft 31. The movable ring gear 33 moves to connect the transmission input shaft 31 while connecting the outer race of the one-way clutch 32 or moves to disengage the outer race of the one-way clutch 32.

Based on the above structure, when the movable ring gear 33 is disengaged from the outer ring, the engine output shaft 11 sequentially transmits drive to the transmission input shaft 31 via the outer ring and the inner ring of the one-way clutch 32, or the one-way clutch 32 is activated; when the movable gear ring 33 is connected with the outer ring, the engine output shaft 11 is transmitted and driven to the gearbox input shaft 31 through the outer ring of the one-way clutch 32 and the movable gear ring 33 in sequence, at the moment, the engine output shaft 11 and the gearbox input shaft 31 rotate together, the one-way clutch 32 does not work, or the one-way clutch 32 is locked. That is, the movable ring gear 33 functions to switch the state of the one-way clutch 32.

The driving motor 34 is connected to and drives the movable ring gear 33 to move.

The position sensor 35 is used to sense the position of the movable ring gear 33, i.e., whether the movable ring gear 33 is connected to the outer race of the one-way clutch 32.

The electromagnetic brake 5 is arranged at one end of the crankshaft far away from the clutch assembly 2. Electromagnetic brake 5 includes electromagnetism fixing base 51 and brake sucking disc 52, and electromagnetism fixing base 51 is fixed with the shell of engine 1, and brake sucking disc 52 links to each other and the motion with the bent axle of engine 1, and when electromagnetism fixing base 51 circular telegram produced the electromagnetic field, brake sucking disc 52 receives the electromagnetic attraction and laminates with electromagnetism fixing base 51 and produce frictional force, makes the bent axle receive friction torque. That is, after the electromagnetic brake 5 is activated, a force in the direction opposite to the rotation direction of the crankshaft is generated between the electromagnetic brake and the crankshaft of the engine 1, thereby assisting the reduction of the rotation speed of the crankshaft and accelerating the reduction process of the rotation speed of the crankshaft. In addition, the power-on time and the power-on voltage of the electromagnetic fixing base 51 can be controlled, so as to control the attraction force of the electromagnetic fixing base 51 to the brake sucker 52 in the pull-on time, i.e. the acting force is not constant.

The controller receives the information and controls the action of the terminal component according to the received information. The controller receives information including, but not limited to, information sent by the position sensor 35, information on the throttle and brake, information on the gear position, torque and rotational speed information of the vehicle, and actions of the components of the terminal include, but are not limited to, movement of the movable ring gear 33, closing and opening of the clutch assembly 2, torque down and up of the engine 1, gear off, gear on, power on and off of the electromagnetic fixed seat 51, and power on voltage and power on time.

As shown in FIGS. 2-5, the method for controlling the gear shifting of the AMT gearbox based on the control system comprises the following steps:

the controller judges whether the AMT gearbox 4 needs to be shifted up, forced shifted down or slid shifted down according to the received information of the brake and the accelerator, the vehicle speed information and the gear information;

when the controller judges that the AMT gearbox 4 needs to be shifted up, firstly, the torque of the engine 1 is reduced, and simultaneously, the engine output shaft 11 is connected with the gearbox input shaft 31 through the one-way clutch 32, namely, the movable gear ring 33 is disconnected with the outer ring of the one-way clutch 32, the one-way clutch 32 is in an activated state, and then subsequent operation is carried out. The gear shifting process of the gear shifting up comprises the following steps: firstly, the engine reduces the torque and activates the one-way clutch 32 at the same time, then the gear is shifted and the electromagnetic brake 5 is electrified and started, when the rotating speed of the engine reaches a set range, the electromagnetic brake 5 is powered off, and finally the gear is shifted, the engine increases the torque and the one-way clutch 32 is locked in sequence. The one-way clutch 32 is locked when the engine torque is increased to reach the driver demand torque. Finally, the one-way clutch 32 is locked to ensure that the reverse dragging condition of the normal running of the vehicle is effective, and the one-way clutch 32 is activated again before the next upshift. In other words, the one-way clutch 32 is in the locked state when the vehicle is running normally.

During the shift-up operation, the clutch of the clutch assembly 2 is kept closed. The rotation speed of the crankshaft of the engine 1 is adjusted in an auxiliary mode through the electromagnetic brake 5, and the rotation speed of the crankshaft of the engine 1 is accelerated and reduced to shorten the gear shifting process. In the gear shifting process, the engine rotating speed reaching the set range means that the engine rotating speed reaches the rotating speed required by a driver or approaches the rotating speed required by the driver, and the approach range can be flexibly designed according to specific application. The driver demand rotational speed is a shift target rotational speed.

When the controller judges that the AMT gearbox 4 needs forced downshift, firstly the engine 1 is turned down and the engine output shaft 11 is connected with the gearbox input shaft 31 through the one-way clutch 32, namely the movable gear ring 33 is disconnected with the outer ring of the one-way clutch 32, and the one-way clutch 32 is in an activated state. And then the subsequent operation is carried out. Specifically, the shift process of the kick-down includes the following steps performed in sequence: the engine is first turned down while the one-way clutch 32 is activated, and then the gear shifting, the engine is turned up and the one-way clutch 32 is locked. The one-way clutch 32 is locked when the engine torque is increased to reach the driver demand torque.

During a shift operation of the kick-down, the clutch of the clutch assembly 2 is maintained in a closed state.

When the controller determines that the AMT gearbox 4 needs to downshift during vehicle coasting, the movable ring gear 33 has moved to a point where the engine output shaft 11 and the gearbox input shaft 31 are co-rotatably connected in the coasting state, i.e. the one-way clutch is originally in the locked state, and the gear shifting operation is directly performed. The shift process for the coast downshift is: firstly, the engine reduces the torque and the clutch of the clutch assembly 2 is separated; then sequentially picking and engaging a gear; finally, the clutch of the clutch assembly 2 is closed while the engine is increasing torque. When the rotation speed of the engine 1 is increased to reach the shift target rotation speed, the clutch of the clutch assembly 2 is opened to be completely closed.

The sliding downshift is that the engine is not supplied with oil, the automobile slides under the oil-supply-free state, at the moment, the wheels drag the engine 1 to rotate reversely, namely, initially, the rotating speed of the inner ring of the one-way clutch 32 is greater than that of the outer ring, the inner ring cannot drive the outer ring to rotate, and at the moment, the one-way clutch 32 needs to be locked.

Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the insubstantial modifications and adaptations made by those skilled in the art according to the above descriptions of the present invention are within the scope of the present invention.