Control system and control method of steering drive axle

Abstract

The invention relates to a control system of a steering drive axle, which comprises a steering drive axle, a transfer case and a first cylinder, and one side of the steering drive axle is provided with a connection and disconnection mechanism; the transfer case is connected with the connecting and disconnecting mechanism through a transmission shaft; the first air cylinder is connected with the connecting and disconnecting mechanism, and the first air cylinder controls the connecting and disconnecting mechanism to enable the steering drive axle and the transmission shaft to be switched between the connecting state and the disconnecting state. The first air cylinder and the connecting and disconnecting mechanism are additionally arranged on the steering drive axle, in the two-drive mode, the first air cylinder controls the connecting and disconnecting mechanism to disconnect the steering drive axle and the transmission shaft, and mechanical abrasion of the transmission shaft and vehicle running resistance and oil consumption are reduced; the technical problems that in the prior art, when a rear wheel is driven, a front wheel can drive a front transmission shaft to do invalid rotation, mechanical abrasion of the transmission shaft is increased, and vehicle running resistance and oil consumption are increased are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle drive technology, and in particular to a control system and a control method for a steering drive axle. Background Art

[0002] Currently, four-wheel drive vehicles usually use a part-time four-wheel drive mode. When the vehicle is driving on an unpaved road, if the rear wheels slip, the front-wheel drive mode of the transfer case can be turned on to achieve four-wheel drive and improve the vehicle's ability to get out of trouble. When the vehicle is driving on a paved road, the front-wheel drive can be turned off and the rear-wheel drive can be used to reduce fuel consumption.

[0003] In the related technology, when the vehicle is in the rear-wheel drive state, the power connection between the front steering drive axle and the transfer case is disconnected, but during the vehicle's driving, the front wheels will drive the front drive shaft to make invalid rotation through the wheel ends, half shafts and final reducer, which not only increases the mechanical wear of the drive shaft, but also increases the vehicle's driving resistance and fuel consumption.

[0004] Therefore, it is necessary to design a new control system for the steering drive axle to overcome the above problems. Summary of the invention

[0005] The present application provides a control system and a control method for a steering drive axle, which can solve the technical problem in the related art that when the rear wheels are driven, the front wheels will drive the front drive shaft to make invalid rotation, which not only increases the mechanical wear of the drive shaft, but also increases the vehicle's driving resistance and fuel consumption.

[0006] In a first aspect, an embodiment of the present application provides a control system for a steering drive axle, comprising: a steering drive axle, a transfer case and a first cylinder, wherein a connection and disconnection mechanism is provided on one side of the steering drive axle; the transfer case is connected to the connection and disconnection mechanism via a transmission shaft; the first cylinder is connected to the connection and disconnection mechanism, and the first cylinder switches the steering drive axle and the transmission shaft between a connected state and a disconnected state by controlling the connection and disconnection mechanism.

[0007] In combination with the first aspect, in one embodiment, a main reduction bevel gear shaft is provided on one side of the steering drive axle, an input flange connecting shaft is provided on one side of the transfer case, the input flange connecting shaft is connected to the transmission shaft, and the connection and disconnection mechanism includes: a first spur gear, a second spur gear and a connecting sleeve, the first spur gear is installed on the main reduction bevel gear shaft; the second spur gear is installed on the input flange connecting shaft; the connecting sleeve is sleeved on the outer sides of the first spur gear and the second spur gear, and the first cylinder controls the connecting sleeve to slide axially to switch the main reduction bevel gear shaft and the input flange connecting shaft between a connected state and a disconnected state.

[0008] In combination with the first aspect, in one embodiment, when the first cylinder drives the connecting sleeve to slide to connect the first spur gear and the second spur gear, the main reduction bevel gear shaft and the input flange connecting shaft are locked; when the first cylinder drives the connecting sleeve to slide to the first spur gear, the main reduction bevel gear shaft and the input flange connecting shaft are disconnected.

[0009] In combination with the first aspect, in one embodiment, the control system further includes a second cylinder, the transfer case is provided with a front end output mechanism, the front end output mechanism is connected to the drive shaft, the second cylinder is connected to the front end output mechanism, and the second cylinder switches the transfer case and the drive shaft between a connected state and a disconnected state by controlling the front end output mechanism.

[0010] In combination with the first aspect, in one embodiment, the control system also includes an air cylinder, which is provided with a low-pressure chamber and a high-pressure chamber, the first cylinder is provided with a first air inlet and a second air inlet, the second cylinder is provided with a third air inlet and a fourth air inlet, the low-pressure chamber is connected to the first air inlet and the third air inlet, and the high-pressure chamber is connected to the second air inlet and the fourth air inlet through a first solenoid valve.

[0011] In combination with the first aspect, in one embodiment, the control system also includes a third cylinder, the third cylinder is connected to the transfer case, the third cylinder is provided with a fifth air inlet and a sixth air inlet, the low-pressure chamber is also connected to the fifth air inlet, and the high-pressure chamber is connected to the sixth air inlet via a second solenoid valve.

[0012] In combination with the first aspect, in one implementation, the first solenoid valve is controlled on and off by a front drive connection switch, and the second solenoid valve is controlled on and off by a high and low gear switch.

[0013] In a second aspect, an embodiment of the present application provides a control method for a control system of a steering drive axle, the control method comprising the following steps:

[0014] Step 1: When the vehicle adopts the four-wheel drive mode, the first cylinder connects the steering drive axle and the transmission shaft by controlling the connection disconnection mechanism.

[0015] Step 2: When the vehicle adopts the two-wheel drive mode, the first cylinder disconnects the steering drive axle and the transmission shaft by controlling the connection disconnection mechanism.

[0016] In combination with the second aspect, in one embodiment, when the vehicle adopts the four-wheel drive mode, the first cylinder connects the steering drive axle and the transmission shaft by controlling the connection disconnection mechanism, including: when the vehicle adopts the four-wheel drive mode, high-pressure air is input into the first cylinder to make the connecting sleeve slide to connect the first spur gear and the second spur gear, so that the main reduction bevel gear shaft and the input flange connecting shaft are connected.

[0017] In combination with the second aspect, in one embodiment, when the vehicle adopts the two-wheel drive mode, the first cylinder disconnects the steering drive axle and the transmission shaft by controlling the connection disconnection mechanism, including: when the vehicle adopts the two-wheel drive mode, low-pressure air is input into the first cylinder to make the connecting sleeve slide to the first spur gear, so that the main reduction bevel gear shaft and the input flange connecting shaft are disconnected.

[0018] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0019] By adding a first cylinder and a connection and disconnection mechanism to the steering drive axle, in the two-wheel drive mode, the first cylinder controls the connection and disconnection mechanism to disconnect the steering drive axle from the drive shaft, thereby reducing the mechanical wear of the drive shaft as well as the vehicle's driving resistance and fuel consumption, thereby solving the technical problem in the related technology that when the rear wheels are driven, the front wheels will drive the front drive shaft to make invalid rotation, which not only increases the mechanical wear of the drive shaft, but also increases the vehicle's driving resistance and fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the principle of a control system of a steering drive axle provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of the steering drive axle provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the principle of the steering drive axle provided in an embodiment of the present application.

[0024] In the figure: 1. Steering drive axle; 100. Connecting and disconnecting mechanism; 101. First spur gear; 102. Second spur gear; 103. Connecting sleeve; 110. Main reduction bevel gear shaft; 120. Input flange connecting shaft; 2. Transfer case; 3. First cylinder; 31. First air inlet; 32. Second air inlet; 4. Second cylinder; 41. Third air inlet; 42. Fourth air inlet; 5. Air reservoir; 51. Low-pressure chamber; 52. High-pressure chamber; 6. First solenoid valve; 7. Third cylinder; 71. Fifth air inlet; 72. Sixth air inlet; 8. Second solenoid valve; 9. Front drive connection switch; 10. High and low gear switch; 11. Engine; 12. Transmission; 13. Rear axle; 14. Input flange. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The embodiment of the present application provides a control system and control method for a steering drive axle, which can solve the technical problem that when the rear wheels are driven, the front wheels will drive the front drive shaft to make invalid rotation, which not only increases the mechanical wear of the drive shaft, but also increases the vehicle's driving resistance and fuel consumption.

[0027] See also Figure 1-3 As shown, an embodiment of the present application provides a control system of a steering drive axle, which includes: a steering drive axle 1, a transfer case 2 and a first cylinder 3, wherein a connection and disconnection mechanism 100 is provided on one side of the steering drive axle 1; the transfer case 2 is connected to the connection and disconnection mechanism 100 via a transmission shaft; the first cylinder 3 is connected to the connection and disconnection mechanism 100, and the first cylinder 3 switches the steering drive axle 1 and the transmission shaft between a connected state and a disconnected state by controlling the connection and disconnection mechanism 100.

[0028] In this embodiment, the input end of the transfer case 2 is connected to the engine 11 and the gearbox 12, the engine 11 inputs power to the transfer case 2, and the output end of the transfer case 2 is connected to the rear axle 13. When the vehicle is in the four-wheel drive mode, the first cylinder 3 controls the connection and disconnection mechanism 100 to connect the steering drive axle 1 with the transmission shaft, and the transfer case 2 transmits power to the steering drive axle 1 and the rear axle 13 at the same time. When the vehicle is in the two-wheel drive mode, the first cylinder 3 controls the connection and disconnection mechanism 100 to disconnect the steering drive axle 1 from the transmission shaft, thereby reducing the mechanical wear of the transmission shaft as well as the vehicle's driving resistance and fuel consumption.

[0029] In this embodiment, the first cylinder 3 and the connection and disconnection mechanism 100 are added to the steering drive axle 1. In the two-wheel drive mode, the first cylinder 3 controls the connection and disconnection mechanism 100 to disconnect the steering drive axle 1 from the drive shaft, thereby reducing the mechanical wear of the drive shaft and the vehicle's driving resistance and fuel consumption. This solves the technical problem in the related art that when the rear wheels are driven, the front wheels will drive the front drive shaft to make invalid rotation, which not only increases the mechanical wear of the drive shaft, but also increases the vehicle's driving resistance and fuel consumption.

[0030] Further, see Figure 2 and Figure 3As shown, in some embodiments, a main reduction bevel gear shaft 110 is provided on one side of the steering drive axle 1, and an input flange connecting shaft 120 is provided on one side of the transfer case 2, and the input flange connecting shaft 120 is connected to the transmission shaft, and the connection and disconnection mechanism 100 includes: a first spur gear 101, a second spur gear 102 and a connecting sleeve 103, the first spur gear 101 is installed on the main reduction bevel gear shaft 110; the second spur gear 102 is installed on the input flange connecting shaft 120; the connecting sleeve 103 is sleeved on the outer sides of the first spur gear 101 and the second spur gear 102, and the first cylinder 3 controls the connecting sleeve 103 to slide axially, so that the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are switched between a connected state and a disconnected state.

[0031] In this embodiment, the steering drive axle 1 is provided with a main reducer and an input flange 14, the main reduction bevel gear shaft 110 is connected to the main reducer, the input flange connecting shaft 120 is connected to the input flange 14, and the input flange 14 is bolted to the transmission shaft. The first cylinder 3 controls the connecting sleeve 103 to slide back and forth axially between the first spur gear 101 and the second spur gear 102, so that the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are switched between a connected state and a disconnected state, thereby switching the steering drive axle 1 and the transmission shaft between a connected state and a disconnected state.

[0032] Further, see Figure 1 and Figure 3 As shown, in some embodiments, when the first cylinder 3 drives the connecting sleeve 103 to slide to connect the first spur gear 101 and the second spur gear 102, the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are locked; when the first cylinder 3 drives the connecting sleeve 103 to slide to the first spur gear 101, the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are disconnected.

[0033] In this embodiment, when high-pressure air is input to the first cylinder 3, there is a pressure difference on both sides of the piston of the first cylinder 3 and pushes the shift fork, causing the connecting sleeve 103 to slide toward the second spur gear 102, so that the first spur gear 101 and the second spur gear 102 are connected as a whole, thereby rigidly connecting the main reduction bevel gear shaft 110 and the input flange connecting shaft 120; when only low-pressure air is input to the first cylinder 3, the low-pressure air pushes the piston to move in the opposite direction and pushes the shift fork, causing the connecting sleeve 103 to slide toward the first spur gear 101, so that the first spur gear 101 and the second spur gear 102 are disconnected, thereby disconnecting the main reduction bevel gear shaft 110 and the input flange connecting shaft 120.

[0034] Further, see Figure 1 As shown, in some embodiments, the control system further includes a second cylinder 4, the transfer case 2 is provided with a front end output mechanism, the front end output mechanism is connected to the drive shaft, the second cylinder 4 is connected to the front end output mechanism, and the second cylinder 4 switches the transfer case 2 and the drive shaft between a connected state and a disconnected state by controlling the front end output mechanism.

[0035] In this embodiment, when the air reservoir 5 outputs high-pressure air, the steering drive axle 1 is connected to the transmission shaft through the connection and disconnection mechanism 100, and the transfer case 2 is connected to the transmission shaft through the front output mechanism, the transfer case 2 is switched to a low gear, and the transfer case 2 transmits power to the steering drive axle 1 and the rear axle 13 at the same time, and the vehicle travels normally in the four-wheel drive mode; when the air reservoir 5 only outputs low-pressure air, the steering drive axle 1 is disconnected from the transmission shaft through the connection and disconnection mechanism 100, and the transfer case 2 is disconnected from the transmission shaft through the front output mechanism, the transfer case 2 is in a high gear, the transfer case 2 will not transmit power to the steering drive axle 1, and no power is transmitted at both ends of the transmission shaft, the transmission shaft can remain stationary, reducing the mechanical loss of the transmission shaft, and effectively reducing the driving resistance and fuel consumption of the vehicle. The air pressure of the high-pressure air can be set to 0.7-0.85MPa, and the air pressure of the low-pressure air can be set to 0.41-0.45MPa.

[0036] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the control system also includes an air cylinder 5, the air cylinder 5 is provided with a low-pressure chamber 51 and a high-pressure chamber 52, the first cylinder 3 is provided with a first air inlet 31 and a second air inlet 32, the second cylinder 4 is provided with a third air inlet 41 and a fourth air inlet 42, the low-pressure chamber 51 is connected to the first air inlet 31 and the third air inlet 41, and the high-pressure chamber 52 is connected to the second air inlet 32 ​​and the fourth air inlet 42 through a first solenoid valve 6.

[0037] In this embodiment, when only the low-pressure chamber 51 provides low-pressure air to the first cylinder 3 and the second cylinder 4 through the first air inlet 31 and the third air inlet 41 respectively, the steering drive axle 1 is in a disconnected state from the transmission shaft, and the transfer case 2 is in a disconnected state from the transmission shaft, and the transfer case 2 will not transmit power to the steering drive axle 1; when the high-pressure chamber 52 provides high-pressure air to the first cylinder 3 and the second cylinder 4 through the second air inlet 32 ​​and the fourth air inlet 42 respectively, due to the pressure difference between the piston of the first cylinder 3 and the piston of the second cylinder 4, the steering drive axle 1 is connected to the transmission shaft through the connection and disconnection mechanism 100, and at the same time, the transfer case 2 is connected to the transmission shaft through the front end output mechanism, and the transfer case 2 can transmit power to the steering drive axle 1.

[0038] Further, see Figure 1 As shown, in some embodiments, the control system also includes a third cylinder 7, the third cylinder 7 is connected to the transfer case 2, the third cylinder 7 is provided with a fifth air inlet 71 and a sixth air inlet 72, the low-pressure chamber 51 is also connected to the fifth air inlet 71, and the high-pressure chamber 52 is connected to the sixth air inlet 72 via a second solenoid valve 8.

[0039] In this embodiment, when only low-pressure air is input to the third cylinder 7, the low-pressure chamber 51 provides low-pressure air to the third cylinder 7 through the fifth air inlet 71, and the transfer case 2 is in a high gear state. When high-pressure air is input to the third cylinder 7, the high-pressure chamber 52 provides high-pressure air to the third cylinder 7 through the sixth air inlet 72. Due to the pressure difference on both sides of the third cylinder 7, the transfer case 2 switches to a low gear state.

[0040] Further, see Figure 1 As shown, in some embodiments, the first solenoid valve 6 is controlled on and off by the front drive connection switch 9, and the second solenoid valve 8 is controlled on and off by the high and low gear switch 10.

[0041] In this embodiment, the first solenoid valve 6 and the second solenoid valve 8 can be set to be normally closed. The first solenoid valve 6 is controlled to be on and off by the front drive connection switch 9, and the second solenoid valve 8 is controlled to be on and off by the high and low gear switch 10. The high and low gear switch 10 can control the second solenoid valve 8 only when the front drive connection switch 9 is turned on, so as to avoid that when the transfer case 2 is in low gear, the torque of the transfer case 2 is fully input into the rear axle 13, causing abnormal damage to the rear axle 13.

[0042] See also Figure 1 and Figure 3As shown, an embodiment of the present application provides a control method for a control system of a steering drive axle, and the control method comprises the following steps:

[0043] Step 1: When the vehicle adopts the four-wheel drive mode, the first cylinder 3 connects the steering drive axle 1 and the transmission shaft by controlling the connection and disconnection mechanism 100.

[0044] In this embodiment, when the vehicle is traveling on an unpaved road, the vehicle needs to adopt the four-wheel drive mode, first park the vehicle on the side of the road, then turn on the front drive connection switch 9 and the high and low gear switch 10, the high-pressure air in the high-pressure chamber 52 of the air reservoir 5 enters the first cylinder 3 and the second cylinder 4 through the first solenoid valve 6, and enters the third cylinder 7 through the second solenoid valve 8, the first cylinder 3 connects the steering drive axle 1 and the transmission shaft by controlling the connection and disconnection mechanism 100, and the second cylinder 4 connects the transfer case 2 with the transmission shaft by controlling the front end output mechanism, so that the transfer case 2 transmits power to the steering drive axle 1 and the rear axle 13 at the same time, and the third cylinder 7 controls the transfer case 2 to switch to a low gear to increase the output torque of the transfer case 2 to the steering drive axle 1 and the rear axle 13, thereby improving the power and escape ability of the vehicle.

[0045] Step 2: When the vehicle adopts the two-wheel drive mode, the first cylinder 3 disconnects the steering drive axle 1 and the transmission shaft by controlling the disconnection mechanism 100 .

[0046] In this embodiment, when the vehicle is traveling on a paved road, the vehicle needs to adopt a two-wheel drive mode. The vehicle is first parked on the roadside, and then the front drive connection switch 9 and the high and low gear switch 10 are disconnected. The supply of high-pressure air is cut off by closing the first solenoid valve 6 and the second solenoid valve 8. The low-pressure air in the low-pressure chamber 51 of the air reservoir 5 enters the first cylinder 3, the second cylinder 4 and the third cylinder 7. The first cylinder 3 disconnects the steering drive axle 1 and the transmission shaft by controlling the connection and disconnection mechanism 100. At the same time, the second cylinder 4 disconnects the transfer case 2 from the transmission shaft by controlling the front output mechanism. The transfer case 2 transmits power to the rear axle 13. There is no power transmission at both ends of the transmission shaft. The transmission shaft can remain stationary, reducing the mechanical loss of the transmission shaft, and effectively reducing the driving resistance and fuel consumption of the vehicle. At the same time, the third cylinder 7 controls the transfer case 2 to switch to a high gear to reduce the output torque of the transfer case 2 to the rear axle 13, thereby avoiding abnormal damage to the rear axle 13 due to over-torque.

[0047] Further, see Figure 1-3As shown, in some embodiments, when the vehicle adopts the four-wheel drive mode, the first cylinder 3 connects the steering drive axle 1 and the transmission shaft by controlling the connection disconnection mechanism 100, including: when the vehicle adopts the four-wheel drive mode, high-pressure air is input into the first cylinder 3, so that the connecting sleeve 103 slides to connect the first spur gear 101 and the second spur gear 102, so that the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are connected.

[0048] In this embodiment, when the vehicle adopts the four-wheel drive mode, high-pressure air is input into the first cylinder 3 through the second air inlet 32. There is a pressure difference on both sides of the piston of the first cylinder 3 and pushes the fork, so that the connecting sleeve 103 slides toward the second spur gear 102, so that the first spur gear 101 and the second spur gear 102 are connected into a whole, thereby rigidly connecting the main reduction bevel gear shaft 110 and the input flange connecting shaft 120.

[0049] Further, see Figure 1-3 As shown, in some embodiments, when the vehicle adopts the two-wheel drive mode, the first cylinder 3 disconnects the steering drive axle 1 and the transmission shaft by controlling the connection disconnection mechanism 100, including: when the vehicle adopts the two-wheel drive mode, low-pressure air is input into the first cylinder 3, so that the connecting sleeve 103 slides to the first spur gear 101, and the main reduction bevel gear shaft 110 and the input flange connecting shaft 120 are disconnected.

[0050] In this embodiment, when the vehicle adopts the two-wheel drive mode, the high-pressure air in the high-pressure chamber 52 is cut off, and the low-pressure air is input into the first cylinder 3 through the first air inlet 31. The low-pressure air pushes the piston to move in the opposite direction and pushes the shift fork, so that the connecting sleeve 103 slides toward the first spur gear 101, so that the first spur gear 101 and the second spur gear 102 are disconnected, thereby disconnecting the main reduction bevel gear shaft 110 and the input flange connecting shaft 120.

[0051] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0052] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A control system for a steering drive axle, characterized in that: It includes: A steering drive axle (1), wherein a connection and disconnection mechanism (100) is provided on one side of the steering drive axle (1); A transfer case (2), the transfer case (2) being connected to the connection / disconnection mechanism (100) via a transmission shaft; A first cylinder (3), the first cylinder (3) is connected to the connection and disconnection mechanism (100), and the first cylinder (3) switches the steering drive axle (1) and the transmission shaft between a connection state and a disconnection state by controlling the connection and disconnection mechanism (100).

2. The control system according to claim 1, characterized in that: A main reduction bevel gear shaft (110) is provided on one side of the steering drive axle (1), an input flange connecting shaft (120) is provided on one side of the transfer case (2), the input flange connecting shaft (120) is connected to the transmission shaft, and the connection and disconnection mechanism (100) comprises: A first spur gear (101), the first spur gear (101) being mounted on the main reduction bevel gear shaft (110); a second spur gear (102), the second spur gear (102) being mounted on the input flange connecting shaft (120); and a connecting sleeve (103), wherein the connecting sleeve (103) is sleeved on the outer sides of the first spur gear (101) and the second spur gear (102), The first cylinder (3) controls the connecting sleeve (103) to slide axially, so that the main reduction bevel gear shaft (110) and the input flange connecting shaft (120) are switched between a connected state and a disconnected state.

3. The control system according to claim 2, characterized in that: When the first cylinder (3) drives the connecting sleeve (103) to slide and connect the first spur gear (101) and the second spur gear (102), the main reduction bevel gear shaft (110) and the input flange connecting shaft (120) are locked; When the first cylinder (3) drives the connecting sleeve (103) to slide to the first spur gear (101), the main reduction bevel gear shaft (110) and the input flange connecting shaft (120) are disconnected.

4. The control system according to claim 1, characterized in that: The control system further comprises a second cylinder (4); the transfer case (2) is provided with a front-end output mechanism, the front-end output mechanism is connected to the transmission shaft, the second cylinder (4) is connected to the front-end output mechanism, and the second cylinder (4) switches the transfer case (2) and the transmission shaft between a connected state and a disconnected state by controlling the front-end output mechanism.

5. The control system according to claim 4, characterized in that: The control system further comprises an air storage cylinder (5), wherein the air storage cylinder (5) is provided with a low-pressure chamber (51) and a high-pressure chamber (52), the first cylinder (3) is provided with a first air inlet (31) and a second air inlet (32), the second cylinder (4) is provided with a third air inlet (41) and a fourth air inlet (42), the low-pressure chamber (51) is connected to the first air inlet (31) and the third air inlet (41), and the high-pressure chamber (52) is connected to the second air inlet (32) and the fourth air inlet (42) via a first solenoid valve (6).

6. The control system according to claim 5, characterized in that: The control system further comprises a third cylinder (7), the third cylinder (7) being connected to the transfer case (2), the third cylinder (7) being provided with a fifth air inlet (71) and a sixth air inlet (72), the low-pressure chamber (51) being further connected to the fifth air inlet (71), and the high-pressure chamber (52) being connected to the sixth air inlet (72) via a second solenoid valve (8).

7. The control system according to claim 6, characterized in that: The first solenoid valve (6) is controlled to be on and off by a front drive connection switch (9), and the second solenoid valve (8) is controlled to be on and off by a high and low gear switch (10).

8. A control method of a control system as claimed in claim 1, characterized in that: The control method comprises the following steps: When the vehicle adopts the four-wheel drive mode, the first cylinder (3) connects the steering drive axle (1) and the transmission shaft by controlling the connection and disconnection mechanism (100); When the vehicle adopts the two-wheel drive mode, the first cylinder (3) disconnects the steering drive axle (1) and the transmission shaft by controlling the connection disconnection mechanism (100).

9. The control method according to claim 8, characterized in that: When the vehicle adopts the four-wheel drive mode, the first cylinder (3) connects the steering drive axle (1) and the transmission shaft by controlling the connection disconnection mechanism (100), including: When the vehicle adopts the four-wheel drive mode, high-pressure air is input into the first cylinder (3), so that the connecting sleeve (103) slides to connect the first spur gear (101) and the second spur gear (102), so that the main reduction bevel gear shaft (110) and the input flange connecting shaft (120) are connected.

10. The control method according to claim 8, characterized in that: When the vehicle adopts the two-wheel drive mode, the first cylinder (3) disconnects the steering drive axle (1) and the transmission shaft by controlling the connection disconnection mechanism (100), including: When the vehicle adopts the two-wheel drive mode, low-pressure air is input into the first cylinder (3), so that the connecting sleeve (103) slides to the first spur gear (101), and the main reduction bevel gear shaft (110) and the input flange connecting shaft (120) are disconnected.

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