Cab lifting protection system, control method and vehicle

Abstract

The present application relates to a cab lift protection system, control method, and vehicle, comprising: a cab longitudinal beam; a cylinder upper bracket, the cylinder upper bracket being connected to the bottom plate of the cab longitudinal beam via a plurality of first fasteners, the cylinder upper bracket comprising a bracket top plate and at least two cylinder fixing side plates fixed to the bracket top plate, the bracket top plate and the at least two bracket top plates forming a cylinder mounting cavity, the bracket top plate being located below the bottom plate of the cab longitudinal beam; an anti-slip bottom plate, the anti-slip bottom plate being installed in the cylinder mounting cavity, the anti-slip bottom plate being located below all the first fasteners, and the anti-slip bottom plate being installed with a first pressure sensor; and a controller, the controller being connected to the first pressure sensor signal and configured to determine whether the first fastener is loose based on the pressure signal from the first pressure sensor. By installing the anti-slip bottom plate below the first fastener, the movement distance of the first fastener along the vehicle Z-direction is limited, thereby reducing the possibility of the first fastener falling out of the cab longitudinal beam and the bracket top plate.

Description

Technical Field

[0001] The present application relates to the field of automotive products and technologies, and in particular to a cab lift protection system, a control method, and a vehicle. Background Art

[0002] Currently, most commercial vehicle cabs are raised and lowered using a lifting cylinder. The upper and lower ends of the lifting cylinder are connected to the cab and vehicle frame via upper and lower brackets, respectively. The upper bracket and cab body are typically connected by bolts, and the cylinder and upper bracket are also connected by bolt pins. However, in current market use, the bolts may fall out due to insufficient tightening during upper bracket assembly or, after tightening, due to loosening due to prolonged vehicle vibration or repeated lifting. This can compromise the safety of the cab lifting process. Summary of the Invention

[0003] The present application provides a cab lifting protection system, control method and vehicle, which can solve the technical problems in related technologies that may occur due to the failure to tighten the bolts when assembling the upper bracket, or the loosening of the bolts due to long-term vibration of the vehicle or repeated lifting, which eventually leads to the falling off of the bolts and affects the safety of the cab lifting process.

[0004] In the first aspect, an embodiment of the present application provides a lifting protection system for a cab, which includes: a cab longitudinal beam; a cylinder upper bracket, the cylinder upper bracket is connected to the bottom plate of the cab longitudinal beam through a plurality of first fasteners, the cylinder upper bracket includes a bracket top plate and at least two cylinder fixing side plates fixed to the bracket top plate, the bracket top plate and at least two bracket top plates form a cylinder mounting cavity, the bracket top plate is located below the bottom plate of the cab longitudinal beam; an anti-stripping bottom plate, the anti-stripping bottom plate is installed in the cylinder mounting cavity, the anti-stripping bottom plate is located below all the first fasteners, and the anti-stripping bottom plate is installed with a first pressure sensor; a controller, the controller is connected to the first pressure sensor signal, and the controller is used to judge whether the first fastener is loose based on the pressure signal of the first pressure sensor.

[0005] In combination with the first aspect, in one embodiment, the lifting protection system also includes: a cylinder connecting shaft, which is connected to the cylinder fixed side plate through a second fastener, and the cylinder connecting shaft is located in the cylinder mounting cavity, and the cylinder connecting shaft is spaced apart from the anti-slip bottom plate; an anti-slip side plate, which is installed on the cylinder fixed side plate, and the anti-slip side plate is arranged on one side of the head of the second fastener along the axial direction of the second fastener; a second pressure sensor, which is installed on the anti-slip side plate, and the second pressure sensor is connected to the controller signal, and the controller is also used to determine whether the second fastener is loose based on the pressure signal of the second pressure sensor.

[0006] In combination with the first aspect, in one embodiment, the anti-slip side plate is provided with a first through-hole and a second through-hole spaced apart from the first through-hole, the anti-slip side plate is riveted to the cylinder fixed side plate by a rivet passed through the first through-hole, and the anti-slip side plate is fixed to the cylinder fixed side plate by a third fastener passed through the second through-hole.

[0007] In combination with the first aspect, in one embodiment, the anti-slip base plate includes: a connecting side plate, the connecting side plate is installed on the cylinder fixed side plate, and the connecting side plate is provided with a fastener avoidance groove; a suspension support plate, one end of the suspension support plate is fixed to the connecting side plate, the suspension support plate is located in the cylinder mounting cavity, the suspension support plate is located below all the first fasteners, and the first pressure sensor is installed on the suspension support plate.

[0008] In combination with the first aspect, in one embodiment, the anti-slip side plate includes a first side plate and an inclined plate connected to the first side plate, and the side of the inclined plate away from the first side plate is connected to a second side plate parallel to the first side plate; the first side plate is attached to the side wall of the cylinder upper bracket, the head of the second fastener is located between the cylinder upper bracket and the second side plate, and the second fastener and the second side plate are spaced apart along the axial direction of the second fastener.

[0009] In combination with the first aspect, in one embodiment, the lifting protection system also includes: a lifting cylinder, the lifting cylinder is connected to the cylinder upper bracket; an oil pump solenoid valve, the oil pump solenoid valve signal is connected to the controller, and the oil pump solenoid valve is connected to the lifting cylinder; an acceleration monitoring device, the acceleration monitoring device is installed in the vehicle's cab, the acceleration monitoring device signal is connected to the controller, and the controller is used to determine whether the cab falls abnormally based on the acceleration signal of the acceleration monitoring device. If so, the oil pump solenoid valve is controlled to drive the piston rod of the lifting cylinder to extend.

[0010] In combination with the first aspect, in one embodiment, the lift protection system further includes a rear suspension upper bracket, and the acceleration monitoring device is installed on the rear suspension upper bracket.

[0011] In the second aspect, an embodiment of the present application provides a control method for the above-mentioned lifting protection system, which includes the following steps: obtaining the acceleration value of the acceleration monitoring device; judging whether the acceleration value is greater than a preset value, and if so, controlling the oil pump solenoid valve to switch to the rising position to drive the piston rod of the lifting cylinder to extend.

[0012] In combination with the second aspect, in one embodiment, the control method further includes: obtaining a lifting switch signal of the cab; if the lifting switch signal is not input and the obtained acceleration value is greater than a preset value, then controlling the oil pump solenoid valve to switch to the rising position, driving the piston rod of the lifting cylinder to extend; if the lifting switch signal is input and the obtained acceleration value is greater than the preset value, then controlling the oil pump solenoid valve to switch to the descending position, driving the piston rod of the lifting cylinder to retract.

[0013] In a third aspect, an embodiment of the present application provides a vehicle comprising the above-mentioned cab lift protection system.

[0014] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0015] By installing an anti-slip base plate under all the first fasteners, the movement distance of the first fasteners along the Z direction of the vehicle can be limited, reducing the possibility of the first fasteners falling off the cab longitudinal beam and the bracket top plate. A first pressure sensor is installed on the anti-slip base plate. When the pressure value obtained by the pressure sensor is greater than the pre-examination value, it can be considered that the first fastener is loose, and the driver can retighten the first fastener in time, thereby solving the technical problem in the related art that the bolts fall off and affect the safety of the lifting process of the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of the cylinder upper bracket connected to the lifting cylinder provided in an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the main structure of the cylinder upper bracket connected to the lifting cylinder provided in an embodiment of the present application;

[0019] Figure 3A schematic diagram of the structure of the anti-slip side plate provided in an embodiment of the present application rotating around the axis of the rivet;

[0020] Figure 4 A schematic diagram of the structure of the anti-slip side plate fixed with a third fastener provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the three-dimensional structure of the anti-slip base plate provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of the lift protection system of the cab provided in an embodiment of the present application;

[0023] Figure 7 A circuit diagram of the control method provided in an embodiment of the present application.

[0024] In the picture:

[0025] 1. First fastener;

[0026] 2. Cylinder upper bracket; 21. Bracket top plate; 22. Cylinder fixed side plate; 23. Install side plate;

[0027] 3. Anti-slip bottom plate; 31. Connecting side plate; 311. Nut; 32. Suspension support plate; 33. Fastener avoidance groove;

[0028] 4. Oil cylinder connecting shaft;

[0029] 5. Second fastener;

[0030] 61, anti-slip side plate; 611, first side plate; 6111, second perforation; 612, inclined plate; 613, second side plate; 6131, observation hole; 62, rivet; 63, third fastener;

[0031] 7. Lifting cylinder;

[0032] 81. Controller; 82. Acceleration monitoring device; 83. Oil pump solenoid valve;

[0033] 91. Cab lift switch; 92. Chassis control module 92;

[0034] 10. Frame. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] An embodiment of the present application provides a cab lifting protection system, which can solve the technical problems in related technologies that may occur due to the bolts not being tightened during the assembly of the upper bracket, or after being tightened, they becoming loose due to long-term vibration of the vehicle or repeated lifting, which eventually leads to the bolts falling off and affecting the safety of the cab lifting process.

[0037] See also Figure 1 As shown, a lifting protection system for a cab provided by an embodiment of the present application may include: a cab longitudinal beam; a cylinder upper bracket 2, the cylinder upper bracket 2 is connected to the bottom plate of the cab longitudinal beam through multiple first fasteners 1, the cylinder upper bracket 2 includes a bracket top plate 21 and at least two cylinder fixing side plates 22 fixed to the bracket top plate 21, the bracket top plate 21 and at least two bracket top plates 21 form a cylinder mounting cavity, the bracket top plate 21 is located below the bottom plate of the cab longitudinal beam; an anti-stripping bottom plate 3, the anti-stripping bottom plate 3 is installed in the cylinder mounting cavity, the anti-stripping bottom plate 3 is located below all the first fasteners 1, and the anti-stripping bottom plate 3 is installed with a first pressure sensor; a controller 81, the controller 81 is connected to the first pressure sensor signal, and the controller 81 is used to determine whether the first fastener 1 is loose based on the pressure signal of the first pressure sensor. It should be understood that the cylinder fixing side plate 22 and the cab longitudinal beam can be fixed on opposite sides of the bracket top plate 21; in addition, the first fastener 1 can be a bolt, or a screw or other structure that can more stably connect the bracket top plate 21 and the cab longitudinal beam.

[0038] In the embodiment of the present application, an anti-slip bottom plate 3 is installed under all the first fasteners 1, so as to limit the movement distance of the first fasteners 1 along the Z direction of the vehicle, that is, to limit the movement distance of the first fasteners 1 along the height direction of the vehicle. In the embodiment of the present application, after the first fasteners 1 are relatively stably fixed to the bracket top plate 21 and the cab longitudinal beam, the anti-slip bottom plate 3 can be spaced apart from the first fasteners 1 along the Z direction of the vehicle. The spacing distance can be small, so that the anti-slip bottom plate 3 can adapt to the bumps during the driving of the vehicle. Under normal bumps, the anti-slip bottom plate 3 and the first fasteners 1 are usually not in contact. Then, when the first pressure sensor obtains a pressure signal, it can be determined that the first fastener 1 has exceeded its normal movement range, that is, it may have become loose. In some other embodiments, the anti-slip bottom plate 3 can be in contact with one end of the first fastener 1 to prevent the first fastener 1 from falling out of the perforation of the bracket top plate 21 and the cab longitudinal beam. At this time, it can be set that the first fastener 1 is judged to be loose or even falling off only when the pressure value measured by the first sensor is greater than a preset value. By setting up the anti-slip base plate 3, in addition to reducing the possibility of the first fastener 1 falling off the cab longitudinal beam and the bracket top plate 21, the first pressure sensor installed on the anti-slip base plate 3 can also timely issue an alarm for the loosening of the first fixing member. After the first pressure sensor obtains the pressure value, it transmits the value to the controller 81. When the controller 81 determines that the first fixing member is loose, it can send a command signal to the cab instrument panel. The alarm indicator light on the instrument panel will light up and an alarm prompt sound will be issued at the same time. The driver can retighten the first fastener 1 in time, solving the technical problem of bolt falling off in the related technology, affecting the safety of the lifting process of the cab.

[0039] See also Figure 6As shown, in some optional embodiments, the lifting protection system also includes: a cylinder connecting shaft 4, which is connected to the cylinder fixed side plate 22 through a second fastener 5, and the cylinder connecting shaft 4 is located in the cylinder mounting cavity, and the cylinder connecting shaft 4 is spaced apart from the anti-slip bottom plate 3; an anti-slip side plate 61, which is installed on the cylinder fixed side plate 22, and the anti-slip side plate 61 is arranged on one side of the head of the second fastener 5 along the axial direction of the second fastener 5; a second pressure sensor, which is installed on the anti-slip side plate 61, and the second pressure sensor is connected to the controller 81 by signal, and the controller 81 is also used to determine whether the second fastener 5 is loose based on the pressure signal of the second pressure sensor. The oil cylinder connecting shaft 4 can be fixed between the oil cylinder fixed side plates 22, or it can be supported between the oil cylinder fixed side plates 22 by the second fastener 5 during the subsequent assembly process. In addition, one end of the lifting oil cylinder 7 can be hinged to the oil cylinder connecting shaft 4, and the other end can be fixed to the vehicle frame 10. The second fastener 5 can also be set as a bolt, pin or screw or other structures. The second fastener 5 can be passed through the two oil cylinder fixed side plates 22, so that the oil cylinder connecting shaft 4 sleeved on the second fastener 5 is located between the two oil cylinder fixed side plates 22 and located in the oil cylinder installation cavity. Furthermore, the oil cylinder connecting shaft 4 and the anti-slip bottom plate 3 are spaced apart along the vehicle Z direction so that they do not interfere with each other, so that the oil cylinder upper bracket 2 can stably connect the cab longitudinal beam and the lifting oil cylinder 7. Preferably, the anti-slip side plate 61 can be arranged in a similar manner to the anti-slip bottom plate 3, that is, the anti-slip side plate 61 can be fitted with the head of the second fastener 5. Preferably, the anti-slip side plate 61 and the second fastener 5 are arranged at an axial distance from each other along the second fastener 5. According to different arrangements, the controller 81 is adjusted accordingly when making a judgment based on the pressure signal of the second pressure sensor. The controller 81 connected to the first pressure sensor and the second pressure sensor can be a newly added controller 81 installed separately in the vehicle, or it can be a vehicle controller 81.

[0040] See also Figure 3 and Figure 4As shown, in some optional embodiments, the anti-slip side plate 61 is provided with a first through-hole and a second through-hole 6111 spaced apart from the first through-hole, the anti-slip side plate 61 is riveted to the cylinder fixed side plate 22 by a rivet 62 passed through the first through-hole, and the anti-slip side plate 61 is fixed to the cylinder fixed side plate 22 by a third fastener 63 passed through the second through-hole 6111. The third fastener 63 can also be a connecting structure such as a bolt or a screw. When the anti-slip side plate 61 is installed on the cylinder fixed side plate 22 only by the rivet 62 passed through the first through-hole, the anti-slip side plate 61 can rotate around the axis of the rivet 62. When the cylinder upper bracket 2 is installed, the anti-slip side plate 61 can be installed on the cylinder fixed side plate 22 by using the rivet 62. After the cylinder upper bracket 2 is fixed to the longitudinal beam of the cab, the cylinder connecting shaft 4 with the cylinder is passed between the two cylinder fixed side plates 22, and then the second fastener 5 is passed through the cylinder fixed side plate 22 and the cavity of the cylinder connecting shaft 4. After the second fastener 5 is fixed, the third fastener 63 is passed through the second through-hole 6111 to fix the anti-slip side plate 61 to the cylinder fixed side plate 22. In the embodiment of the present application, the anti-slip side plate 61 can be pre-installed on the cylinder upper bracket 2 by setting the rivet 62. When the second fastener 5 needs to be installed, the anti-slip side plate 61 can be rotated in a certain direction without affecting the installation of the second fastener 5, thereby simplifying the overall installation process and improving assembly efficiency.

[0041] See also Figure 2 As shown, in some optional embodiments, the anti-slip base plate 3 may include: a connecting side plate 31, the connecting side plate 31 is installed on the cylinder fixed side plate 22, and the connecting side plate 31 is provided with a fastener avoidance groove 33; a suspension support plate 32, one end of the suspension support plate 32 is fixed to the connecting side plate 31, the suspension support plate 32 is located in the cylinder mounting cavity, the suspension support plate 32 is located below all the first fasteners 1, and the first pressure sensor is installed on the suspension support plate 32. The connecting side plate 31 and the anti-slip side plate 61 can be fixed to opposite sides of the oil cylinder fixed side plate 22 respectively. The anti-slip side plate 61 is fixed to the oil cylinder fixed side plate 22 by rivets 62 and third fasteners 63. Both the rivets 62 and the third fasteners 63 can penetrate a side wall of the oil cylinder fixed side plate 22 and extend into the oil cylinder installation cavity. Therefore, the fastener avoidance groove 33 is provided on the connecting side plate 31 to reduce the installation difficulty of the connecting side plate 31 and make the connecting side plate and the oil cylinder fixed side plate 22 fit more tightly. Figure 5As shown, the connecting side plate 31 can be mounted on the oil cylinder fixed side plate 22 using bolts. Multiple nuts 311 can be fixed on the side of the connecting side plate 31 away from the oil cylinder fixed side plate 22 to further enhance installation convenience. The surface of the connecting side plate 31 can be perpendicular to the surface of the suspension support plate 32. Preferably, the connecting side plate 31 and the suspension support plate 32 are connected by an arc plate, which can effectively disperse the stress at the connection and improve the overall structural stability of the anti-slip base plate 3. Mounting the first pressure sensor on the suspension support plate 32 can make the first pressure sensor more sensitive and enhance the accuracy and timeliness of the sensing results.

[0042] In the embodiment of the present application, the oil cylinder upper bracket 2 may further include an installation side plate 23, and the installation side plate 23 is fixed to the side of the bracket top plate 21 away from the oil cylinder fixed side plate 22. The specific assembly process of the oil cylinder upper bracket 2 can be to first install the anti-slip side plate 61 on the oil cylinder fixed side plate 22 through the rivet 62, and then pass the first fastener 1 through the bracket top plate 21 and the bottom plate of the cab longitudinal beam respectively, and use other bolt connectors to pass through the installation side plate 23 and the side plate of the cab longitudinal beam, and then tighten it. The axis of the bolt connector that fixes the installation side plate 23 to the cab longitudinal beam can be perpendicular to the axis of the first fastener 1. Next, before assembling the lifting cylinder 7, fix the anti-slip bottom plate 3 to the The oil cylinder fixed side plate 22 is tightened by using the nut fixed on the oil cylinder fixed side plate 22. The gap between the head of the installed first fastener and the top surface of the anti-slip base plate 3 is controlled within 0.5mm. When the first fastener 1 is repeatedly stressed during vehicle driving or lifting and torque attenuation and loosening occurs, the first fastener 1 will be blocked by the anti-slip base plate 3 after withdrawing 0.5mm, and will no longer loosen or fall off, thereby ensuring the connection safety between the oil cylinder upper bracket 2 and the cab body.

[0043] Furthermore, after the oil cylinder upper bracket 2 is assembled, the lifting oil cylinder 7 is connected. After the anti-slip side plate 61 installed on the oil cylinder upper bracket 2 is rotated a certain angle around the axial direction of the rivet 62, the hole for installing the second fastener 5 opened on the oil cylinder fixed side plate 22 is exposed. The second fastener 5 is inserted through the hole and the hole of the oil cylinder connecting shaft 4 to complete the connection between the lifting oil cylinder 7 and the oil cylinder upper bracket 2. Thereafter, the anti-slip side plate 61 is rotated around the axial direction of the rivet 62 to its original position to block the head of the second fastener 5. Finally, the anti-slip side plate 61 is tightened and fixed to the oil cylinder fixed side plate 22 using the third fastener 63 to prevent the anti-slip side plate 61 from rotating. This allows the anti-slip side plate 61 to always face the head of the second fastener 5. Even if the nut of the second fastener 5 is loosened, it cannot be withdrawn and fall off, thereby ensuring the safety of the connection between the lifting oil cylinder 7 and the oil cylinder upper bracket 2. Preferably, the gap between the head of the second fastener 5 and the anti-slip side plate 61 is also controlled within 0.5 mm. When the second fastener 5 is repeatedly subjected to force during vehicle driving or lifting and torque attenuation and loosening occurs, the second fastener 5 will be blocked by the anti-slip side plate 61 after withdrawing 0.5 mm and will no longer loosen or fall off, thereby ensuring the connection safety between the cylinder upper bracket 2 and the cab body.

[0044] In some optional embodiments, the anti-slip side plate 61 includes a first side plate 611 and an inclined plate 612 connected to the first side plate 611. The inclined plate 612 is connected to a second side plate 613 parallel to the first side plate 611 on a side away from the first side plate 611. The first side plate 611 is attached to the side wall of the oil cylinder upper bracket 2. The head of the second fastener 5 is located between the oil cylinder upper bracket 2 and the second side plate 613. The second fastener 5 and the second side plate 613 are spaced apart along the axis of the second fastener 5. In the embodiment of the present application, the second side plate 613 and the head of the second fastener 5 are spaced apart, and the second pressure sensor is mounted on the second side plate 613. The first side plate 611 and the second side plate 613 are connected by the inclined plate 612, so that the first side plate 611 and the second side plate 613 are not in the same plane. The first side plate 611 is attached to the oil cylinder fixed side plate 22 and installed to enhance the connection stability between the first side plate 611 and the oil cylinder fixed side plate 22. The second side plate 613 is adjusted to be spaced apart from the oil cylinder fixed side plate 22 along the axis of the second fastener 5 via the inclined plate 612, so that a cavity is formed between the second side plate 613 and the oil cylinder fixed side plate 22 to accommodate the head of the second fastener 5. Furthermore, connecting the first side plate 611 and the second side plate 613 by the inclined plate 612 can also enhance the overall toughness of the anti-slip side plate 61, strengthen the strength of the anti-slip side plate 61, and extend its service life. It should be noted that the first through-hole and the second through-hole 6111 are both provided on the first side plate 611 . Preferably, the second side plate 613 may also be provided with an observation hole 6131 to facilitate observation of the distance between the second side plate 613 and the head of the second fastener 5 .

[0045] In some optional embodiments, the lift protection system may further include: a lift cylinder 7 connected to the cylinder upper bracket 2; an oil pump solenoid valve 83, signal-connected to the controller 81 and connected to the lift cylinder 7; an acceleration monitoring device 82 installed in the vehicle cab and signal-connected to the controller 81; the controller 81 being configured to determine whether the cab is abnormally falling based on the acceleration signal from the acceleration monitoring device 82, and if so, controlling the oil pump solenoid valve 83 to extend the piston rod of the lift cylinder 7. If the cab is not abnormally falling, no automatic control operation is performed. One end of the lifting cylinder 7 is connected to the cylinder upper bracket 2 via the cylinder connecting shaft 4, and the oil pump solenoid valve 83 is connected to the lifting cylinder 7. The oil pump solenoid valve 83 can control the extension or retraction of the piston rod of the lifting cylinder 7. In the embodiment of the present application, the oil pump solenoid valve 83 can control the lifting cylinder 7 to switch to the lifting state when the controller 81 determines that the acceleration of the acceleration monitoring device 82 is abnormal, so that the piston rod of the lifting cylinder 7 extends and the cab is lifted again; when there is no abnormality in the cab, no automatic control operation is performed. Preferably, the acceleration monitoring device 82 can be set as an acceleration sensor, or it can be other devices such as an accelerometer that can record vehicle acceleration.

[0046] It should be understood that most current commercial vehicle lifting systems utilize a single-cylinder lift mechanism. If a malfunction occurs within the lift cylinder 7, the cylinder may automatically descend. Whether this is due to an internal malfunction within the lift cylinder 7 or loose bolts between the upper bracket and the cylinder, it can cause the cab to suddenly fall or slide during lifting. In this embodiment, an acceleration monitoring device 82 is provided to monitor the acceleration of the cab along the vehicle's Z-direction (i.e., the vehicle's height). This acceleration monitoring device 82 works in conjunction with the oil pump solenoid valve 83 to effectively prevent damage caused by a sudden drop of the cab.

[0047] In some optional embodiments, the lift protection system further includes a rear suspension upper bracket, and the acceleration monitoring device 82 is mounted on the rear suspension upper bracket. In the embodiment of the present application, mounting the acceleration monitoring device 82 on the rear suspension upper bracket can more sensitively and accurately obtain the acceleration of the cab. In some other embodiments, the acceleration monitoring device 82 can also be mounted at other locations on the rear of the cab.

[0048] The present application also provides a method for controlling the lift protection system. The method may include the following steps:

[0049] S1: Acquire the acceleration value of the acceleration monitoring device 82 , which can be transmitted to the controller 81 .

[0050] S2: Determine whether the acceleration value is greater than the preset value. If so, control the oil pump solenoid valve 83 to switch to the rising position, drive the piston rod of the lifting cylinder 7 to extend, and judge whether the acceleration value is greater than the preset value in the controller 81. In the embodiment of the present application, it is set that when the cab falls downward at a speed greater than 100 mm / min along the Z direction of the vehicle, the controller 81 outputs a lifting signal, controls the oil pump solenoid valve 83 to switch to the rising position, and drives the motor of the lifting cylinder 7 to work.

[0051] In some optional embodiments, the control method may further include: obtaining a lifting switch signal of the cab; if the lifting switch signal is not input and the obtained acceleration value is greater than a preset value, then controlling the oil pump solenoid valve 83 to switch to the rising position, driving the piston rod of the lifting cylinder 7 to extend; if the lifting switch signal is input and the obtained acceleration value is greater than the preset value, then controlling the oil pump solenoid valve 83 to switch to the descending position, driving the piston rod of the lifting cylinder 7 to retract. It should be understood that when the driver requires the vehicle to be lifted normally, the vehicle status must usually be judged in advance. The judgment may include judging the vehicle speed, neutral switch signal and parking brake switch signal. When the vehicle speed is 0, the neutral switch signal is valid (that is, the switch is closed) and the parking brake switch signal is valid (that is, the switch is closed), the switch signal of the cab lift switch 9 is input to control the lifting of the cab. In the embodiment of the present application, after the vehicle's cab meets the above-mentioned lifting conditions and completes the lifting, it is usually necessary for the cab to remain in a lifted state to facilitate the operation of maintenance personnel or drivers. Therefore, if there is no input of the cab lift switch signal obtained, it can be determined that the cab still needs to be maintained at a certain height and not fall. Therefore, when the obtained acceleration value is greater than the preset value, it can be determined that the cab has failed to fall, and the controller 81 can control the oil pump solenoid valve 83 to switch to the lifting position, driving the piston rod of the lifting cylinder 7 to extend, so as to ensure the safety of the vehicle and personnel. Conversely, when the lift switch signal is input, even though the acceleration value obtained is greater than the preset value, it is considered that the cab is falling because the operator needs it to fall back. The controller 81 can control the oil pump solenoid valve 83 to switch to the lowering position, driving the piston rod of the lift cylinder 7 to retract until the cab returns to its original position. In this embodiment of the present application, by adopting the oil pump solenoid valve 83 reversing structure, the oil pump can automatically reverse and start according to the signal input, playing a role in actively preventing the cab from falling, greatly improving the safety of lifting. In some other embodiments, if the lift switch signal is input and the acceleration value obtained is greater than the preset value, the oil pump solenoid valve 83 can also be inoperative.

[0052] See also Figure 7As shown, the vehicle speed signal can be transmitted to the microcontroller of the chassis control module 92 via line a, the neutral switch signal can be transmitted to the microcontroller of the chassis control module 92 via line b, the parking brake switch signal can be transmitted to the microcontroller of the chassis control module 92 via line c, and the signal from the vehicle controller 81 can be transmitted to the microcontroller of the chassis control module 92 via line e. After each signal is transmitted to the microcontroller in the chassis control module 92, it is further transmitted to the controller 81 via the vehicle body line, so that the controller 81 can send a command to the chassis control module 92, causing the chassis control module 92 to control the lifting motor to be activated along line d. It should be understood that the signal transmission between the microcontroller of the chassis control module 92 and the controller 81 can be bidirectional, allowing the controller 81 to send commands to the chassis control module 92 and also monitor the actual status of the chassis control module 92.

[0053] An embodiment of the present application also provides a vehicle, which includes the above-mentioned cab lift protection system. The vehicle in the embodiment of the present application includes the cab lift protection system in any of the above-mentioned embodiments, and its functions and effects are the same as those in the above-mentioned embodiments, which will not be repeated here.

[0054] In the description of this application, it should be noted that the terms "upper" and "lower" and the like 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 this application and simplifying the description, and do not indicate or imply 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 this 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device comprising a set of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device comprising the recited element. The foregoing description is intended only to provide specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to be accorded the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A cab lift protection system, characterized in that: It includes: Cab longitudinal beams; An oil cylinder upper bracket (2), the oil cylinder upper bracket (2) being connected to the bottom plate of the cab longitudinal beam via a plurality of first fasteners (1), the oil cylinder upper bracket (2) comprising a bracket top plate (21) and at least two oil cylinder fixing side plates (22) fixed to the bracket top plate (21), the bracket top plate (21) and the at least two bracket top plates (21) forming an oil cylinder installation cavity, the bracket top plate (21) being located below the bottom plate of the cab longitudinal beam; An anti-slip base plate (3), the anti-slip base plate (3) is installed in the oil cylinder installation cavity, the anti-slip base plate (3) is located below all the first fasteners (1), and the anti-slip base plate (3) is installed with a first pressure sensor; a controller (81), the controller (81) being connected to the first pressure sensor signal, the controller (81) being used to determine whether the first fastener (1) is loose based on the pressure signal of the first pressure sensor; The lift protection system further comprises: An oil cylinder connecting shaft (4), the oil cylinder connecting shaft (4) being connected to the oil cylinder fixed side plate (22) via a second fastener (5), and the oil cylinder connecting shaft (4) being located in the oil cylinder mounting cavity, and the oil cylinder connecting shaft (4) being spaced apart from the anti-slip bottom plate (3); an anti-slip side plate (61), the anti-slip side plate (61) being mounted on the oil cylinder fixed side plate (22), and the anti-slip side plate (61) being arranged on one side of the head of the second fastener (5) along the axial direction of the second fastener (5); a second pressure sensor, the second pressure sensor being mounted on the anti-slip side plate (61), the second pressure sensor being connected to the controller (81) via a signal, the controller (81) being further configured to determine whether the second fastener (5) is loose based on a pressure signal from the second pressure sensor; The anti-slip side plate (61) is provided with a first through-hole and a second through-hole (6111) spaced apart from the first through-hole; the anti-slip side plate (61) is riveted to the oil cylinder fixed side plate (22) via a rivet (62) passed through the first through-hole; and the anti-slip side plate (61) is fixed to the oil cylinder fixed side plate (22) via a third fastener (63) passed through the second through-hole (6111); The anti-slip bottom plate (3) comprises: A connecting side plate (31), the connecting side plate (31) being mounted on the oil cylinder fixed side plate (22), and the connecting side plate (31) being provided with a fastener avoidance groove (33); A suspension support plate (32), one end of the suspension support plate (32) is fixed to the connecting side plate (31), the suspension support plate (32) is located in the oil cylinder installation cavity, the suspension support plate (32) is located below all the first fasteners (1), and the first pressure sensor is installed on the suspension support plate (32).

2. The cab lift protection system according to claim 1, characterized in that: The anti-slip side plate (61) comprises a first side plate (611) and an inclined plate (612) connected to the first side plate (611); a second side plate (613) parallel to the first side plate (611) is connected to a side of the inclined plate (612) away from the first side plate (611); The first side plate (611) is attached to the side wall of the oil cylinder upper bracket (2), the head of the second fastener (5) is located between the oil cylinder upper bracket (2) and the second side plate (613), and the second fastener (5) and the second side plate (613) are spaced apart along the axial direction of the second fastener (5).

3. The cab lift protection system according to claim 1, characterized in that: The lift protection system further comprises: A lifting cylinder (7), the lifting cylinder (7) being connected to the cylinder upper bracket (2); An oil pump solenoid valve (83), the oil pump solenoid valve (83) is signal-connected to the controller (81), and the oil pump solenoid valve (83) is connected to the lifting cylinder (7); An acceleration monitoring device (82) is installed in the cab of the vehicle. The acceleration monitoring device (82) is connected to the controller (81) via a signal. The controller (81) is used to determine whether the cab has fallen abnormally based on the acceleration signal of the acceleration monitoring device (82). If so, the controller controls the oil pump solenoid valve (83) to drive the piston rod of the lifting cylinder (7) to extend.

4. The cab lift protection system according to claim 3, characterized in that: The lifting protection system further comprises a rear suspension upper bracket, and the acceleration monitoring device (82) is mounted on the rear suspension upper bracket.

5. A vehicle, characterized in that: It includes the lifting protection system of the cab as described in any one of claims 1 to 4.

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