Lifting protection system of cab, control method and vehicle

Abstract

The invention relates to a cab lifting protection system, a control method and a vehicle. The cab lifting protection system comprises a cab longitudinal beam; the oil cylinder upper support is connected to a bottom plate of the cab longitudinal beam through a plurality of first fasteners, the oil cylinder upper support comprises a support top plate and at least two oil cylinder fixing side plates fixed to the support top plate, an oil cylinder mounting cavity is defined by the support top plate and the at least two support top plates, and the support top plates are located below the bottom plate of the cab longitudinal beam; the anti-disengaging bottom plate is installed in the oil cylinder installation cavity, the anti-disengaging bottom plate is located below all the first fasteners, and a first pressure sensor is installed on the anti-disengaging bottom plate; the controller is in signal connection with the first pressure sensor, and the controller is used for judging whether the first fastener is loosened or not based on a pressure signal of the first pressure sensor. The anti-disengaging bottom plate is installed below the first fastener, the moving distance of the first fastener in the Z direction of the vehicle is limited, and the possibility that the first fastener disengages from the longitudinal beam of the cab and the top plate of the support is reduced.

Description

Technical Field

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

[0002] At present, most commercial vehicle cabs use lifting cylinders to lift and lower the cab. The upper and lower ends of the lifting cylinder are respectively connected to the cab and the frame through the upper bracket and the lower bracket. The existing upper bracket and the cab body are generally connected by bolts, and the cylinder and the upper bracket are also connected by bolt pins. During the current market use, the bolts may not be tightened during the assembly of the upper bracket, or after tightening, they may become loose due to long-term vibration of the vehicle or repeated lifting. The force may eventually cause the bolts to fall off, affecting 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 the related technology that the bolts may not be tightened when assembling the upper bracket, or they may become loose after being tightened due to long-term vibration of the vehicle or repeated lifting, which may eventually cause the bolts to fall off and affect the safety of the cab lifting process.

[0004] In a first aspect, an embodiment of the present application provides a lifting protection system for a cab, comprising: a cab longitudinal beam; an upper cylinder bracket, the upper cylinder bracket being connected to the bottom plate of the cab longitudinal beam by a plurality of first fasteners, the upper cylinder 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 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-stripping bottom plate, the anti-stripping bottom plate being installed in the cylinder mounting cavity, the anti-stripping bottom plate being located below all the first fasteners, the anti-stripping bottom plate being installed with a first pressure sensor; a controller, the controller being connected to the first pressure sensor signal, the controller being used to determine 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-detachment bottom plate; an anti-detachment side plate, which is installed on the cylinder fixed side plate, and the anti-detachment 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-detachment 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-detachment side plate is provided with a first through hole and a second through hole spaced apart from the first through hole, the anti-detachment side plate is riveted to the cylinder fixed side plate by a rivet passed through the first through hole, and the anti-detachment 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 cab of the vehicle, 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, and if so, control the oil pump solenoid valve 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 mounted 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, and the control method 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, driving 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 has no input and the acquired 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 has an input and the acquired 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 brought by the technical solution provided in the embodiments of the present application include:

[0015] By installing an anti-slip base plate under all the first fasteners, the moving 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 longitudinal beam of the cab and the top plate of the bracket. 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 technology 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 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.

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

[0018] Figure 2 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-drop 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 by the third fastener provided in the embodiment of the present application;

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

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

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

[0024] In the figure:

[0025] 1. The 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. 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 lifting 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 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.

[0036] An embodiment of the present application provides a lifting protection system for a cab, which can solve the technical problems in the related art that the bolts may not be tightened when assembling the upper bracket, or they may become loose after being tightened due to long-term vibration of the vehicle or stress during repeated lifting, which may eventually cause the bolts to fall off and affect the safety of the lifting process of the cab.

[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, wherein the cylinder upper bracket 2 is connected to the bottom plate of the cab longitudinal beam through a plurality of 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, and the bracket top plate 21 is located below the bottom plate of the cab longitudinal beam; an anti-slip bottom plate 3, wherein the anti-slip bottom plate 3 is installed in the cylinder mounting cavity, the anti-slip bottom plate 3 is located below all the first fasteners 1, and the anti-slip bottom plate 3 is installed with a first pressure sensor; a controller 81, wherein 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 relatively stably connect the bracket top plate 21 and the cab longitudinal beam.

[0038] In the embodiment of the present application, by installing the anti-slip bottom plate 3 under all the first fasteners 1, the moving distance of the first fasteners 1 along the Z direction of the vehicle can be limited, that is, the moving distance of the first fasteners 1 along the height direction of the vehicle can be limited. 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, and the spacing distance can be small, so that the anti-slip bottom plate 3 can adapt to the bumps during the driving process of the vehicle. Under normal bumps, the anti-slip bottom plate 3 and the first fasteners 1 are usually in a non-contact state. Then, when the first pressure sensor obtains the pressure signal, it can be determined that the first fastener 1 exceeds its normal moving range, that is, it may be loose. In some other embodiments, the anti-slip bottom plate 3 can be in close 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 fall off only when the pressure value measured by the first sensor is greater than the preset value. In addition to reducing the possibility of the first fastener 1 falling off the cab longitudinal beam and the bracket top plate 21 by setting the anti-slip base plate 3, the first pressure sensor installed on the anti-slip base plate 3 can also promptly 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. The driver can retighten the first fastener 1 in time, which solves 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-detachment bottom plate 3; an anti-detachment side plate 61, which is installed on the cylinder fixed side plate 22, and the anti-detachment 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-detachment 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 in 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 frame 10. The second fastener 5 can also be set as other structures such as bolts, pins or screws. The second fastener 5 can be inserted into 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 Z direction of the vehicle 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 fit the head of the second fastener 5, and preferably the anti-slip side plate 61 and the second fastener 5 are arranged at an axial interval 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 whole 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 penetrated 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 penetrated 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 penetrated 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 first 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 sleeve is penetrated between the two cylinder fixed side plates 22, and then the second fastener 5 is penetrated 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 penetrated 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-detachment 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-detachment 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 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. The connecting side plate 31 and the anti-slip side plate 61 can be fixed to the 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, which can 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 connection side plate 31 can be installed on the oil cylinder fixed side plate 22 by bolt connection, and a plurality of nuts 311 can be fixed on the side of the connection side plate 31 away from the oil cylinder fixed side plate 22 to further enhance the convenience of installation. The plate surface of the connection side plate 31 can be perpendicular to the plate surface of the suspension support plate 32, and preferably, the connection side plate 31 and the suspension support plate 32 are connected by an arc plate, which can effectively disperse the stress on the connection and improve the stability of the overall structure of the anti-slip bottom plate 3. Installing 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 result.

[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 may 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 them. 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 on the cab longitudinal beam by bolts. The cylinder fixed side plate 22 is tightened by using nuts fixed on the 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 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 around the axial direction of the rivet 62 by a certain angle, the hole for installing the second fastener 5 opened on the oil cylinder fixed side plate 22 is exposed, and 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 the original position to block the head of the second fastener 5, and finally the anti-slip side plate 61 is tightened and fixed on the oil cylinder fixed side plate 22 by the third fastener 63 to prevent the anti-slip side plate 61 from rotating, so that the anti-slip side plate 61 can always face the head of the second fastener 5, and 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 stressed 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 being withdrawn 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, and the side of the inclined plate 612 away from the first side plate 611 is connected to a second side plate 613 parallel to 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. 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 installed 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 from the oil cylinder fixed side plate 22 along the axis of the second fastener 5 through 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. Further, 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-detachment side plate 61, strengthen the strength of the anti-detachment 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 formed in 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 lifting protection system may further include: a lifting cylinder 7, the lifting cylinder 7 is connected to the cylinder upper bracket 2; an oil pump solenoid valve 83, the oil pump solenoid valve 83 signal is connected to the controller 81, and the oil pump solenoid valve 83 is connected to the lifting cylinder 7; an acceleration monitoring device 82, the acceleration monitoring device 82 is installed in the cab of the vehicle, the acceleration monitoring device 82 signal is connected to the controller 81, and the controller 81 is used to determine whether the cab falls abnormally based on the acceleration signal of the acceleration monitoring device 82, and if so, control the oil pump solenoid valve 83 to drive the piston rod of the lifting cylinder 7 to extend. When the cab does not fall abnormally, no automatic control operation may be performed. One end of the lifting cylinder 7 is connected to the cylinder upper bracket 2 through the cylinder connecting shaft 4, and the oil pump solenoid valve 83 is connected to the lifting cylinder 7. The piston rod of the lifting cylinder 7 can be controlled to extend or retract through the oil pump solenoid valve 83. 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 to lift the cab again; when there is no abnormality in the cab, no automatic control operation can be 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 of the current commercial vehicle lifting systems use a single cylinder for lifting. When a fault occurs inside the lifting cylinder 7, the cylinder may automatically slide down. Whether it is an internal fault in the lifting cylinder 7 or a loose bolt between the upper bracket and the cylinder, it may cause a safety accident of the cab suddenly falling or sliding down when the cab is lifted. In the embodiment of the present application, the acceleration monitoring device 82 can be set to monitor the moving acceleration of the cab along the Z direction of the vehicle (that is, the height direction of the vehicle). The acceleration monitoring device 82 cooperates with the oil pump solenoid valve 83 to effectively prevent the cab from falling suddenly and causing losses.

[0047] In some optional embodiments, the lift protection system further includes a rear suspension upper bracket, and the acceleration monitoring device 82 is installed on the rear suspension upper bracket. In the embodiment of the present application, installing 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 installed at other positions at the rear of the cab.

[0048] The embodiment of the present application also provides a control method of the above-mentioned lifting protection system, and the control 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 a 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 along the Z direction of the vehicle at a speed greater than 100 mm / min, 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 acquired 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 acquired 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 is usually determined in advance. The determination may include determining the vehicle speed, the neutral switch signal and the 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 cab lift. In the embodiment of the present application, after the cab of the vehicle meets the above-mentioned lifting conditions and completes the lift, the cab is usually required to remain in a lifted state for the convenience of maintenance personnel or the driver. Therefore, if the obtained cab lift switch signal has no input, it can be determined that the cab still needs to remain at a certain height without falling. Therefore, when the acquired 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 rising position, driving the piston rod of the lifting cylinder 7 to extend, so as to ensure the safety of the vehicle and personnel. On the contrary, when the lifting switch signal is input, although 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, and the controller 81 can control the oil pump solenoid valve 83 to switch to the lowering position, driving the piston rod of the lifting cylinder 7 to retract until the cab returns to its position. In the embodiment of the present application, by adopting the oil pump solenoid valve 83 reversing structure, the oil pump can realize automatic reversing and starting according to the signal input, which plays a role in actively preventing the cab from falling, greatly improving the lifting safety. In some other embodiments, if the lifting switch signal is input and the acceleration value obtained is greater than the preset value, the oil pump solenoid valve 83 may not work.

[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 vehicle controller 81 signal 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, the signal is transmitted to the controller 81 via the vehicle body line, so that the controller 81 can send instructions to the chassis control module 92, so that the chassis control module 92 controls the lifting motor to start along line d. It should be understood that the signal between the microcontroller of the chassis control module 92 and the controller 81 can be bidirectional transmission, so that the controller 81 can send instructions to the chassis control module 92 and monitor the actual state of the chassis control module 92 at the same time.

[0053] An embodiment of the present application also provides a vehicle, which includes the above-mentioned lift protection system for the cab. The vehicle in the embodiment of the present application includes the lift protection system for the cab 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 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.

[0055] It should be noted that, in the present 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 the 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 "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. 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 obvious 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 scope consistent with the principles and novel features applied herein.

Claims

1. A lifting protection system for a cab, characterized in that: It includes: Cab longitudinal beam; 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) enclosing an oil cylinder installation cavity, the bracket top plate (21) being located below the bottom plate of the cab longitudinal beam; An anti-slip bottom plate (3), the anti-slip bottom plate (3) is installed in the oil cylinder installation cavity, the anti-slip bottom plate (3) is located below all the first fasteners (1), and the anti-slip bottom 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.

2. The cab lift protection system according to claim 1, characterized in that: The lift protection system further comprises: A cylinder connecting shaft (4), the cylinder connecting shaft (4) being connected to the cylinder fixed side plate (22) via a second fastener (5), the cylinder connecting shaft (4) being located in the cylinder mounting cavity, and the 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, wherein the second pressure sensor is mounted on the anti-slip side plate (61), the second pressure sensor is connected to the controller (81) by signal, and the controller (81) is further used to determine whether the second fastener (5) is loose based on the pressure signal of the second pressure sensor.

3. The lifting protection system of the cab as claimed in claim 2, characterized in that: 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) via 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) via a third fastener (63) passed through the second through hole (6111).

4. The cab lift protection system according to claim 3, characterized in that: The anti-slip bottom plate (3) comprises: A connecting side plate (31), the connecting side plate (31) is mounted on the oil 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 which 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 of the first fasteners (1), and the first pressure sensor is installed on the suspension support plate (32).

5. The cab lift protection system according to claim 2, 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 the 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).

6. The cab lift protection system according to claim 1, characterized in that: The lift protection system further comprises: A lifting cylinder (7), wherein the lifting cylinder (7) is 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) signal is connected to the controller (81). The controller (81) is used to determine whether the cab falls abnormally based on the acceleration signal of the acceleration monitoring device (82). If so, the oil pump solenoid valve (83) is controlled to drive the piston rod of the lifting cylinder (7) to extend.

7. The lifting protection system of the cab as claimed in claim 6, characterized in that: The lift protection system also includes a rear suspension upper bracket, and the acceleration monitoring device (82) is installed on the rear suspension upper bracket.

8. A control method for a lift protection system as claimed in claims 6 to 7, characterized in that: The control method comprises the following steps: Obtaining an acceleration value of an acceleration monitoring device (82); It is determined whether the acceleration value is greater than a preset value. If so, the oil pump solenoid valve (83) is controlled to switch to the rising position, driving the piston rod of the lifting cylinder (7) to extend.

9. The control method according to claim 8, characterized in that: The control method further includes: Get the lift switch signal of the cab; If there is no input of the lifting switch signal and the acquired acceleration value is greater than the preset value, the oil pump solenoid valve (83) is controlled 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 acquired acceleration value is greater than the preset value, the oil pump solenoid valve (83) is controlled to switch to the descending position, driving the piston rod of the lifting cylinder (7) to retract.

10. A vehicle, characterized in that: It comprises a lift protection system for a cab as described in any one of claims 1 to 7.

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