Anti-torque double-pull-rod system, control method thereof and vehicle

Abstract

The invention provides an anti-torque double-pull-rod system and a control method thereof and a vehicle, the anti-torque double-pull-rod system comprises a control assembly, two pull rods and a pressure sensor, each pull rod comprises a pull rod large end, a pull rod small end and a pull rod support connected between the pull rod large end and the pull rod small end, the pull rod large ends of the pull rods are used for being connected with an auxiliary frame, and the pull rod small ends of the pull rods are used for being connected with the auxiliary frame. The pressure sensor is arranged at the large end of the pull rod; the pull rod small ends of the two pull rods are used for being connected with a gearbox and an engine respectively; the control assembly comprises a control unit and two motors, the motors and the pressure sensors are in communication connection with the control unit, and the two motors are connected with the pull rod supports of the two pull rods in a one-to-one correspondence mode and used for driving the pull rod supports of the pull rods to move in the extending direction of the pull rod supports. According to the anti-torsion double-pull-rod system, the problem that potential safety hazards are likely to occur due to the fact that the distribution proportion and design of the pull rods on the two sides of an existing double-pull-rod structure are unreasonable is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to an anti-torsion double-tie rod system and a control method thereof, and a vehicle. Background Art

[0002] The automobile powertrain suspension system usually includes a left suspension, a right suspension and a torsion bar. The torsion bar is arranged below the powertrain and includes a large end bushing, a small end bushing, and a rod bracket connected between the large end bushing and the small end bushing. The small end bushing is connected to the powertrain, and the large end bushing is connected to the subframe. The torsion bar reduces the vibration transmitted from the powertrain to the subframe through the bushings at both ends, thereby improving the NVH performance of the vehicle.

[0003] At present, the single tie rod scheme of hybrid vehicles can no longer bear heavy loads, and the transmission housing is prone to cracking or tie rod breakage. In order to improve the load-bearing capacity of the rear suspension and match the vehicle project development, a four-point suspension, namely a double tie rod structure, has been added. However, when the rubber of the large end bushing in the existing double tie rod structure reaches the nonlinear section, the loads on both sides no longer meet the linear design requirements. When the driver accelerates or decelerates suddenly, the load is prone to increase and cause the parts to crack. There are unreasonable distribution ratios and designs of the tie rods on both sides, which may cause problems such as insufficient strength on one side or redundant loads, posing safety hazards. Summary of the invention

[0004] In view of the problem that the existing double-tie rod structure has unreasonable distribution ratio and design of the tie rods on both sides, which may easily lead to potential safety hazards, the present invention provides a torsion-resistant double-tie rod system and a control method and a vehicle.

[0005] On the one hand, the present invention provides a torsion-resistant double tie rod system, comprising a control assembly, two tie rods and a pressure sensor, wherein the tie rod comprises a tie rod big end, a tie rod small end, and a tie rod bracket connected between the tie rod big end and the tie rod small end, the tie rod big end of the tie rod is used to be connected to a sub-frame, and the pressure sensor is arranged at the tie rod big end of the tie rod; the tie rod small ends of the two tie rods are used to be connected to a gearbox and an engine respectively;

[0006] The control component includes a control unit and two motors. The motors and the pressure sensors are respectively connected to the control unit for communication. The two motors are respectively connected to the two tie rod brackets of the tie rods in a one-to-one correspondence, and are used to drive the tie rod brackets of the tie rods to move along the extension direction of the tie rod brackets.

[0007] Optionally, a driving gear is provided at the output end of the motor, a rack is provided on the pull rod bracket, and the driving gear is meshed with the rack.

[0008] Optionally, the big end of the tie rod includes an inner tube, a rubber body and an outer tube, the rubber body is wrapped around the outer periphery of the inner tube, and the pressure sensor is arranged on the rubber body; the outer tube is sleeved on the outer periphery of the rubber body, and the tie rod bracket passes through the outer tube and the rubber body to be connected to the inner tube; the outer tubes of the two brackets are used to connect to the gearbox and the engine respectively.

[0009] Optionally, the rubber body includes an upper rubber and a lower rubber, the large end of the pull rod further includes a bolt and a nut, the nut is threadedly connected to the bolt, and the upper rubber and the lower rubber are press-fitted onto the pull rod bracket through the bolt and the nut.

[0010] Optionally, the pressure sensor is a strain gauge sensor.

[0011] On the other hand, the present invention further provides a control method applicable to any of the above-mentioned torsion-resistant double-tie rod systems, comprising the following steps:

[0012] Acquiring strain information of the rubber bodies in the large ends of the two tie rods through the pressure sensor;

[0013] According to the strain information of the two rubber bodies, judging whether the deformation of the two rubber bodies enters a nonlinear section, and determining the start and close of the motor;

[0014] When the deformation of the two rubber bodies enters the nonlinear section, according to the wear of the two rubber bodies, the motor corresponding to the pull rod with the greater wear of the rubber body is controlled to start, and the pull rod bracket is driven to move to reduce the deformation of the rubber body.

[0015] Optionally, when the deformation of the two rubber bodies enters the nonlinear section and one rubber body is worn more than the other, the pressure sensor at the rubber body with greater wear transmits a fault code to the control unit, and the control unit controls the motor corresponding to the pull rod with the greater wear of the rubber body.

[0016] Optionally, when the motor drives the rod bracket to move to a displacement threshold, or the rubber body with greater wear does not deform within a certain period of time, the control unit turns on another motor to drive the rod bracket of another rod to move, thereby reducing the deformation of the other rubber body.

[0017] Optionally, when the deformation of the two rubber bodies does not enter the nonlinear section, the motor remains in an off state.

[0018] On the other hand, the present invention further provides a vehicle, comprising any one of the above-mentioned torsion-resistant double tie rod systems.

[0019] In the present invention, the motor is connected to the rod bracket to drive the rod to move in the direction in which the rod bracket extends, thereby reducing the compression deformation of the rubber body at the large end of the rod. By setting a pressure sensor to detect the compression deformation of the rubber body at the large end of the rod or the stiffness displacement curve of the rubber body, it is convenient to transmit a signal to the control unit in time to control the corresponding motor to start, thereby specifically reducing rubber aging, effectively ensuring the life of the rubber, avoiding the failure of components caused by the increase in load caused by the rubber entering the nonlinear section, ensuring system performance, reducing the cost of replacing parts due to system cracking and damage, and ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a torsion-resistant double-tie rod system provided by one embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of two tie rods of a torsion-resistant double tie rod system provided by one embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a tie rod of a torsion-resistant double tie rod system provided by one embodiment of the present invention;

[0023] Figure 4 It is a working principle diagram of a tie rod of a torsion-resistant double tie rod system provided by one embodiment of the present invention;

[0024] Figure 5 is a working principle diagram of another tie rod of a torsion-resistant double tie rod system provided by one embodiment of the present invention;

[0025] Figure 6 It is a flow chart of a control method of a torsion-resistant double-tie rod system provided in one embodiment of the present invention.

[0026] The reference numerals in the drawings of the specification are as follows:

[0027] 1. Tie rod; 1a: first tie rod; 1b: second tie rod; 11. tie rod big end; 12. tie rod small end; 13. tie rod bracket; 14. inner tube; 15. outer tube; 161. upper end rubber; 162. lower end rubber; 17. bolt; 18. nut;

[0028] 2. Subframe;

[0029] 31. First motor; 32. Second motor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0032] On the one hand, if Figure 1-Figure 5 As shown, an anti-torsion double tie rod system according to an embodiment of the present invention comprises a control assembly, two tie rods 1 and a pressure sensor, wherein the tie rod 1 comprises a tie rod big end 11, a tie rod small end 12, and a tie rod bracket 13 connected between the tie rod big end 11 and the tie rod small end 12, the tie rod big end 11 of the tie rod 1 is used to connect with the sub-frame 2, and the pressure sensor is arranged at the tie rod big end 11 of the tie rod 1. The tie rod small ends 12 of the two tie rods 1 are used to connect with the gearbox and the engine respectively.

[0033] The control assembly includes a control unit and two motors, the motors and the pressure sensor are respectively connected to the control unit for communication, and the two motors are respectively connected to the two tie rod brackets 13 of the tie rods 1 in a one-to-one correspondence, and are used to drive the tie rod brackets 13 of the tie rods 1 to move along the extension direction of the tie rod brackets 13. Specifically, the motor is a servo motor, and the control unit is an electronic component for controlling the rotation of the motor. A motor housing and a bracket for mounting the motor are provided outside the motor, and the motor is mounted on the subframe 2 through the bracket.

[0034] It should be noted here that the control unit can control two motors, or each motor has a control unit.

[0035] In a specific embodiment, the two tie rods 1 are respectively the first tie rod 1a and the second tie rod 1b, the first tie rod 1a is connected to the gearbox, and the second tie rod 1b is connected to the engine. The two motors are respectively the first motor 31 and the second motor 32, and the two pressure sensors are respectively the first sensor and the second pressure sensor, the first pressure sensor is arranged at the tie rod big end 11 of the first tie rod 1a, and the first motor 31 is connected to the tie rod bracket 13 of the first tie rod 1a. The second pressure sensor is arranged at the tie rod big end 11 of the second tie rod 1b, and the second motor 32 is connected to the tie rod bracket 13 of the second tie rod 1b.

[0036] In the embodiment of the present invention, the motor is connected to the rod bracket 13 to drive the rod 1 to move in the direction in which the rod bracket 13 extends, thereby reducing the compression deformation of the rubber body at the large end 11 of the rod. By setting a pressure sensor to detect the compression deformation of the rubber body at the large end 11 of the rod or the stiffness displacement curve of the rubber body, it is convenient to transmit a signal to the control unit in time to control the start of the corresponding motor, thereby reducing rubber aging in a targeted manner, effectively ensuring the life of the rubber, avoiding component failure caused by the increase in load caused by the rubber entering the nonlinear section, ensuring system performance, reducing the cost of replacing system cracks and damage, and ensuring driving safety.

[0037] like Figure 4and Figure 5 As shown, in some embodiments of the present invention, the output end of the motor is provided with a driving gear (not shown in the figure), and the rod bracket 13 is provided with a rack (not shown in the figure), and the driving gear is meshed with the rack. Specifically, the rack on the rod bracket 13 is arranged on the end face of the rod bracket 13, and the torque is output through the output end of the motor, and the driving gear is meshed with the rack, so as to convert the rotational motion into the linear motion of the rod 1, and the displacement of the motion is determined by the stiffness displacement curve of the rubber body in the big end 11 of the rod detected by the pressure sensor. When the rubber body enters the nonlinear section, the rubber body begins to wear and the service life begins to decrease. At this time, the motor is started to drive the rod 1 to move, thereby reducing the deformation of the rubber body.

[0038] It is explained here that a rack can also be added outside the output shaft of the motor to mesh with the rack on the tie rod bracket 13. At the same time, limit blocks can also be set at both ends of the rack of the tie rod bracket 13 to limit the displacement process of the tie rod bracket 13.

[0039] like Figure 1 As shown, in some embodiments of the present invention, the tie rod big end 11 includes an inner tube 14, a rubber body and an outer tube 15, the rubber body is wrapped around the outer periphery of the inner tube 14, and the pressure sensor is arranged on the rubber body. The outer tube 15 is sleeved on the outer periphery of the rubber body, and the tie rod bracket 13 passes through the outer tube 15 and the rubber body and is connected to the inner tube 14. The outer tubes 15 of the two brackets are used to connect with the gearbox and the engine respectively. Specifically, the rubber body is press-fitted on the subframe 2.

[0040] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the rubber body includes an upper rubber 161 and a lower rubber 162, and the big end 11 of the pull rod also includes a bolt 17 and a nut 18, and the nut 18 is threadedly connected to the bolt 17, and the upper rubber 161 and the lower rubber 162 are pressed onto the pull rod bracket 13 through the bolt 17 and the nut 18.

[0041] In some embodiments of the present invention, the pressure sensor is a strain gauge sensor.

[0042] On the other hand, Figure 6 As shown, based on the fact that the rubber with large longitudinal bearing capacity of hybrid vehicles is easily cracked and fails when entering the nonlinear section after being worn, an embodiment of the present invention provides a control method for the torsion-resistant double tie rod 31 system applicable to any of the above items, comprising the following steps:

[0043] The strain information of the rubber bodies in the two pull rod big ends 11 is obtained through the pressure sensor.

[0044] According to the strain information of the two rubber bodies, it is judged whether the deformation of the two rubber bodies enters the nonlinear section, and the start and close of the motor are determined.

[0045] When the deformation of the two rubber bodies enters the nonlinear section, according to the wear of the two rubber bodies, the motor corresponding to the pull rod 1 with the greater wear of the rubber body is controlled to start, and the pull rod bracket 13 is driven to move to reduce the deformation of the rubber body.

[0046] In this embodiment, by connecting with the motor at the tie rod bracket 13, a pressure sensor is arranged at the rubber body of the big end 11 of the tie rod, and the control unit monitors the compression deformation of the rubber body in the pressure sensor. When the rubber body enters the nonlinear section, the compression of the rubber body is reduced by the action of the motor, and the longitudinal load force of the two tie rods 1 is controlled, thereby effectively ensuring the service life of the rubber body, reducing the cracking and replacement costs of components, and ensuring driving safety.

[0047] like Figure 6 As shown, in some embodiments of the present invention, when the deformation of the two rubber bodies enters the nonlinear section, when one rubber body is more worn than the other rubber body, the pressure sensor at the rubber body with greater wear transmits a fault code to the control unit, and the control unit air-controls the motor corresponding to the pull rod 1 with greater wear of the rubber body. By transmitting the fault code to predict the risk, the failure of components caused by the increased load caused by the rubber body entering the nonlinear section is avoided, and the system performance is guaranteed.

[0048] like Figure 6 As shown, in some embodiments of the present invention, when the motor drives the tie rod bracket 13 to move to the displacement threshold, or the rubber body with greater wear does not deform within a certain period of time, the control unit turns on another motor to drive the tie rod bracket 13 of another tie rod 1 to move, thereby reducing the deformation of the other rubber body. By starting two motors, the two tie rod brackets 13 work together to achieve control and allocation of longitudinal force, ensure the strength and durability of the entire vehicle of the torsion-resistant double tie rod 1 system, and thus protect the safety of the driver.

[0049] like Figure 6 As shown, in some embodiments of the present invention, when the deformation of the two rubber bodies does not enter the nonlinear section, the motor remains in the off state.

[0050] Specifically, the control process of the control method of the torsion-resistant double-tie rod system is as follows: the control unit obtains the strain information of the rubber body or the stiffness displacement curve, and determines whether the two rubber bodies enter the linear segment.

[0051] If the rubber body of the first rod 1a is more worn than the second rubber body, a fault code is reported to the control unit, and the control unit controls the first motor 31 to start, thereby reducing the compression of the rubber body of the first rod 1a and preventing the nonlinear section from causing excessive load force. If the displacement process of the first motor 31 controlling the movement of the first rod 1a reaches a limit, or the rubber body of the first rod 1a no longer undergoes a large deformation, the first motor 31 stops working and starts the second motor 32. The second motor 32 drives the second rod 1b to move, thereby reducing the compression of the rubber body of the second rod 1b.

[0052] If the rubber body of the second rod 1b is more worn than the first rubber body, a fault code is reported to the control unit, and the control unit controls the second motor 32 to start, thereby reducing the compression of the rubber body of the second rod 1b and preventing the nonlinear section from causing excessive load force. If the displacement process of the second rod 1b controlled by the second motor 32 reaches a limit, or the rubber body of the second rod 1b no longer undergoes a large deformation, the second motor 32 stops working and starts to start the first motor 31. The first motor 31 drives the first rod 1a to move, thereby reducing the compression of the rubber body of the first rod 1a.

[0053] If the rubber bodies of the first pull rod 1a and the second pull rod 1b do not enter the nonlinear section, the motor remains in the off state and does not control the first pull rod 1a and the second pull rod 1b to move.

[0054] On the other hand, an embodiment of the present invention provides a vehicle, comprising the torsion-resistant double tie rod system described in any one of the above embodiments.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A torsion-resistant double-tie rod system, characterized in that: It includes a control component, two tie rods and a pressure sensor, wherein the tie rod includes a tie rod big end, a tie rod small end, and a tie rod bracket connected between the tie rod big end and the tie rod small end, the tie rod big end of the tie rod is used to be connected to the sub-frame, and the pressure sensor is arranged on the tie rod big end of the tie rod; the tie rod small ends of the two tie rods are used to be connected to the gearbox and the engine respectively; The control component includes a control unit and two motors. The motors and the pressure sensors are respectively connected to the control unit for communication. The two motors are respectively connected to the two tie rod brackets of the tie rods in a one-to-one correspondence, and are used to drive the tie rod brackets of the tie rods to move along the extension direction of the tie rod brackets.

2. The torsion-resistant double-tie rod system according to claim 1, characterized in that: The output end of the motor is provided with a driving gear, the pull rod bracket is provided with a rack, and the driving gear is meshed with the rack.

3. The torsion-resistant double-tie rod system according to claim 1, characterized in that: The big end of the tie rod includes an inner tube, a rubber body and an outer tube, the rubber body is wrapped around the outer periphery of the inner tube, and the pressure sensor is arranged on the rubber body; the outer tube is sleeved on the outer periphery of the rubber body, and the tie rod bracket passes through the outer tube and the rubber body and is connected to the inner tube; the outer tubes of the two brackets are used to connect with the gearbox and the engine respectively.

4. The torsion-resistant double-tie rod system according to claim 3, characterized in that: The rubber body includes an upper rubber and a lower rubber, and the large end of the pull rod also includes a bolt and a nut, the nut is threadedly connected with the bolt, and the upper rubber and the lower rubber are press-fitted onto the pull rod bracket through the bolt and the nut.

5. The torsion-resistant double-tie rod system according to claim 1, characterized in that: The pressure sensor is a strain gauge sensor.

6. A control method for the torsion-resistant double-tie rod system according to any one of claims 1 to 5, characterized in that: The following steps are involved: Acquiring strain information of the rubber bodies in the large ends of the two tie rods through the pressure sensor; According to the strain information of the two rubber bodies, judging whether the deformation of the two rubber bodies enters a nonlinear section, and determining the start and close of the motor; When the deformation of the two rubber bodies enters the nonlinear section, according to the wear of the two rubber bodies, the motor corresponding to the pull rod with the greater wear of the rubber body is controlled to start, and the pull rod bracket is driven to move to reduce the deformation of the rubber body.

7. The control method of the torsion-resistant double-tie rod system according to claim 6, characterized in that: When the deformation of the two rubber bodies enters the nonlinear section and one of the rubber bodies is worn more than the other, the pressure sensor at the rubber body with greater wear transmits a fault code to the control unit, and the control unit controls the motor corresponding to the pull rod whose rubber body is worn more.

8. The control method of the torsion-resistant double-tie rod system according to claim 6, characterized in that: When the motor drives the rod bracket to move to a displacement threshold, or the rubber body with greater wear does not deform within a certain period of time, the control unit turns on another motor to drive the rod bracket of another rod to move, thereby reducing the deformation of the other rubber body.

9. The control method of the torsion-resistant double-tie rod system according to claim 6, characterized in that: When the deformation of the two rubber bodies does not enter the nonlinear section, the motor remains in the off state.

10. A vehicle, characterized in that: The invention comprises the torsion-resistant double-tie rod system as described in any one of claims 1 to 5.

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