CN112747074A - Novel magneto-rheological damper and vehicle ride comfort control method - Google Patents

Novel magneto-rheological damper and vehicle ride comfort control method Download PDF

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Publication number
CN112747074A
CN112747074A CN202011576446.0A CN202011576446A CN112747074A CN 112747074 A CN112747074 A CN 112747074A CN 202011576446 A CN202011576446 A CN 202011576446A CN 112747074 A CN112747074 A CN 112747074A
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China
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shock absorber
bypass
piston
holes
bypass holes
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CN202011576446.0A
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CN112747074B (en
Inventor
刘志恩
安宏杰
彭可挥
卢炽华
宋伟志
李永超
颜伏伍
侯献军
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F16F15/0235—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means where a rotating member is in contact with fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F16F15/027—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means comprising control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/368—Sealings in pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers

Abstract

The invention discloses a novel magneto-rheological damper and a vehicle ride comfort control method, which comprise a working cylinder, a piston, a flow damper and magneto-rheological fluid, wherein a piston cavity and a motor cavity which are adjacent to each other are arranged in the working cylinder, the piston comprises a piston head and a piston rod, the piston head is arranged in the piston cavity, a plurality of first bypass holes are distributed on the piston head, the bottom of the piston rod is fixed with the piston head, the flow damper is sleeved on the piston rod and can move up and down along with the piston, a transmission mechanism capable of driving the flow damper to rotate relative to the piston is arranged in the motor cavity, the flow damper is distributed into a plurality of areas, a group of second bypass holes are arranged in each area, at least one second bypass hole is arranged in each group of the second bypass holes, the flow damper is driven by the transmission mechanism to rotate relative to the piston, the number of the first bypass holes, the smoothness of the vehicle under different load conditions and different road conditions is improved.

Description

Novel magneto-rheological damper and vehicle ride comfort control method
Technical Field
The invention relates to the technical field of automobile NVH, in particular to a novel magneto-rheological damper and a vehicle ride comfort control method.
Background
In the driving process of the automobile, the suspension system generates vibration due to road excitation, and in order to improve the smoothness of the driving process of the automobile, a shock absorber is arranged in the suspension in parallel with the elastic element. Currently, automobile shock absorbers are classified into passive shock absorbers, active shock absorbers, and semi-active shock absorbers. The passive shock absorber is difficult to adapt to different roads and use conditions due to the fact that parameters such as rigidity, damping and the like are not adjustable. Although the active shock absorber can adapt to different roads and use conditions, the device is complex, the technical requirement is high, and the cost is high. Therefore, the semi-active shock absorber with relatively simple manufacturing process, low price and good shock absorption effect is developed at a rapid pace. The magnetorheological fluid is used as a novel intelligent material, the viscosity of the magnetorheological fluid can change along with the change of the intensity of an external magnetic field, and the magnetorheological fluid is quick, reversible and controllable. The magneto-rheological damper makes use of the characteristic and the magneto-rheological effect, takes the motion sensors of the vehicle body and the wheels as input signals, and makes real-time response to road conditions and working conditions.
Most of the components of the vehicle such as the engine are placed at the front end, so that the gravity center of the vehicle is close to the front, and therefore, the damping coefficients of the front magnetorheological shock absorbers and the rear magnetorheological shock absorbers of the vehicle are required to be large at the front and small at the rear. The damping coefficients of the magnetorheological shock absorbers are fixed, and as the road surfaces of the vehicles are changed in the driving process, the damping coefficients of the shock absorbers required by the vehicles on different road surfaces are different, so that the magnetorheological shock absorbers are mostly only suitable for specific working conditions when being matched with vehicle suspensions. The influence of the vehicle on the ride comfort of the vehicle due to the shock absorbers on different road surfaces, different gravity center distributions (when passengers are carried and the trunk is loaded with goods and the like) and different working conditions is not fully considered.
Disclosure of Invention
According to the defects of the prior art, the invention aims to provide a novel magnetorheological damper and a vehicle ride comfort control method.
In order to solve the technical problems, the invention adopts the technical scheme that:
a novel magneto-rheological shock absorber comprises a working cylinder, a piston, a flow baffle and magneto-rheological fluid, wherein adjacent piston cavities and motor cavities are arranged in the working cylinder, the piston comprises a piston head and a piston rod, the piston head is arranged in the piston cavities, an iron core and a magnet exciting coil are arranged on the piston head, a plurality of first side through holes which are longitudinally communicated are uniformly distributed on the piston head, the bottom of the piston rod is fixed with the piston head, the top of the piston rod penetrates out of the motor cavities, the flow baffle is sleeved on the piston rod and can move up and down along with the piston, a transmission mechanism is arranged in the motor cavities and can drive the flow baffle to rotate relative to the piston, a plurality of areas are uniformly distributed on the flow baffle, the number of the areas is consistent with that of the first side through holes, and each area is internally provided with a group of second side, the group of second bypass holes at least comprises a second bypass hole which is longitudinally communicated, in a plurality of regions, the number of the second bypass holes in each group of the second bypass holes is sequentially increased by one, the aperture size of each second bypass hole is consistent with that of one first bypass hole, the interval angle of every two adjacent second bypass holes in one group of the second bypass holes is consistent, and in the beginning, each of the first bypass holes is aligned with one of the second bypass holes in each of the areas, all of the first bypass holes are open, the transmission mechanism drives the flow baffle to rotate relative to the piston, so that the number of the first bypass holes and the second bypass holes which are aligned can be reduced, and the number of the opened first bypass holes is further reduced, the magnetorheological fluid is arranged in the piston cavity, and the magnetorheological fluid can flow out of the second bypass holes from the first bypass holes.
Furthermore, the floating piston is arranged between the piston head and the working cylinder barrel, and an air cavity between the floating piston and the working cylinder barrel forms an energy accumulator.
Further, the floating piston comprises a floating piston main body, a drying bag and a rubber gasket, an annular groove is formed in the middle of the floating piston cylinder, and the drying bag and the rubber gasket are arranged in the annular groove.
Further, drive mechanism includes drive motor, first drive gear and second drive gear, drive motor fixes on the piston rod, first drive gear is installed on drive motor's the output shaft, second drive gear install on the current blocking ware and with first drive gear meshing.
Furthermore, the flow blocking device comprises a flow blocking sleeve and a flow blocking plate fixed at the bottom of the flow blocking sleeve, the flow blocking sleeve and the flow blocking plate are sleeved on the piston rod, the second transmission gear is installed on the flow blocking sleeve, and a plurality of groups of second bypass holes are formed in the flow blocking sleeve.
Further, still be equipped with the piston shell on the piston head, the piston shell with be equipped with the sprue between the piston head, magnetorheological suspensions can follow the sprue flows.
A vehicle ride control method, comprising:
step 1, mounting four novel magneto-rheological shock absorbers on a vehicle, wherein the four novel magneto-rheological shock absorbers comprise two front shock absorbers and two rear shock absorbers;
step 2, setting an initial state that only a front row has a person and a rear row has no luggage and other passengers in the vehicle, controlling a flow damper in a front shock absorber to rotate by a controller, enabling the number of aligned first bypass holes and second bypass holes in the front shock absorber to be 0, namely the number of opened first bypass holes in the front shock absorber to be 0, controlling the flow damper in a rear shock absorber to rotate by the controller, enabling each first bypass hole in the rear shock absorber to be aligned with one second bypass hole in each area, namely all first bypass holes in the rear shock absorber to be opened, and enabling magnetorheological fluid to flow out of all first bypass holes in the rear shock absorber;
step 3, determining the distance of the backward movement of the gravity center according to the difference value of the increased weight of the rear row and the increased weight of the front row in the actual vehicle driving process, determining the number of the opened first bypass holes of the front shock absorber and the rear shock absorber according to the distance of the backward movement of the gravity center, and controlling the flow damper in the rear shock absorber to rotate by the controller when the increased weight of the rear row is more than that of the front row so as to reduce the number of the opened first bypass holes in the rear shock absorber;
and 4, judging the road condition, if the vehicle runs on a better road surface, controlling the front shock absorber and the rear shock absorber to simultaneously close the first bypass holes with the same number on the previous basis by the controller according to the road condition, and if the vehicle runs on a poorer road surface, controlling the front shock absorber and the rear shock absorber to simultaneously open the second bypass holes with the same number on the previous basis by the controller according to the road condition.
Further, in step 3, setting the distance of the backward movement of the center of gravity as d, the spacing angle between two adjacent second bypass holes as alpha, the difference between the increased weight of the rear row and the increased weight of the front row as m, the number of first bypass holes on the front shock absorber and the rear shock absorber as s, determining the distance of the backward movement of the center of gravity according to the increased weight of the rear row compared with the front row, when 0< m > n, the distance of the backward movement of the center of gravity 0< d > l, the damper in the rear shock absorber does not rotate, controlling the number of the opened first bypass holes in the rear shock absorber to be more than the number of the opened first bypass holes in the front shock absorber by the controller, when n < m > 2n, the distance of the backward movement of the center of gravity l < d > 2l, the damper in the rear shock absorber rotates alpha, controlling the number of the opened first bypass holes in the rear shock absorber to be more than the number of opened first bypass holes in the front shock absorber by s-1 by the controller, when 2n is less than or equal to 3n, the distance between the backward movement of the gravity center is less than or equal to 2l, d is less than or equal to 3l, the flow baffle in the rear shock absorber rotates by 2 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be more than s-2 than the number of the opened first side through holes in the front shock absorber, when 3n is less than or equal to 4n, the distance between the backward movement of the gravity center is less than or equal to 4l, the flow baffle in the rear shock absorber rotates by 3 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be more than s-3 than the number of the opened first side through holes in the front shock absorber, when 4n is less than or equal to 5n, the distance between the backward movement of the gravity center is less than or equal to 5l, the flow baffle in the rear shock absorber rotates by 4 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be.
Further, in the novel magnetorheological damper, 4 first bypass holes are uniformly distributed on the piston head, the interval angle between every two adjacent first bypass holes is 90 degrees, 4 areas are uniformly distributed on the flow baffle, 4 areas are formed in each group, the number of the second bypass holes in each group is 1, 2, 3 and 4, and in each group of the second bypass holes, the interval angle between every two adjacent second bypass holes is 15 degrees.
Further, at the beginning, 4 first bypass hole and 4 second bypass hole align, open 4 first bypass hole, drive through drive mechanism the flow baffle for the piston rotates 15 degrees, realize 3 first bypass hole and 3 the second bypass hole aligns, opens 3 first bypass hole rotates 30 degrees and realizes 2 first bypass hole and 2 the second bypass hole aligns, opens 2 first bypass hole, rotates 45 degrees and realizes 1 first bypass hole and 1 the second bypass hole aligns, opens 1 first bypass hole, rotates 60 degrees and realizes that the number of first bypass hole and second bypass hole align is 0, opens 0 first bypass hole.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the novel magneto-rheological shock absorber and the vehicle ride comfort control method, the piston head is provided with the first bypass holes, so that the damping coefficient of the shock absorber in a low-speed region of the piston can be effectively reduced, the difference value of the damping coefficients of the shock absorber before and after a damping mutation point is reduced, the damping force impact is reduced, and the ride comfort and the control stability of the whole vehicle are improved.
2. According to the novel magneto-rheological shock absorber and the vehicle ride comfort control method, the design of the flow blocking device can control the opening and closing of each first side through hole on the piston, the opening and closing of each first side through hole can be timely adjusted under different loads and different road conditions of a vehicle, the difference of damping coefficients of the front and rear dampers of the vehicle is realized, and the ride comfort and the control stability of the vehicle under different loads and different road conditions are improved.
3. According to the novel magneto-rheological damper and the vehicle ride comfort control method, the floating piston is attached with the drying bag and the rubber gasket. During the up-and-down sliding process of the floating piston, the sealing function is firstly realized. And the drying bag can effectively absorb moisture and air infiltrated in the damper during working, and prevent the magnetorheological fluid of the damper from deteriorating or degrading due to the influence of the moisture and the air.
Drawings
FIG. 1 is an assembly view of the shock absorber of the present invention;
FIG. 2 is a piston configuration of the present invention;
FIG. 3 is a top view of the piston head of the present invention;
FIG. 4 is a schematic structural diagram of a flow baffle of the present invention;
FIG. 5 is a top view of the flow deflector of the present invention;
FIG. 6 is a flow chart of the control of an automobile suspension incorporating the present invention under different operating conditions.
Wherein: 1. a piston; 2. a working cylinder barrel; 3. a motor cavity; 4. a drive motor; 5. a second transmission gear; 6. a flow baffle; 7. an upper piston chamber; 8. a piston lower chamber; 9. a floating piston; 10. a rubber gasket; 11. an accumulator; 12. a piston housing; 13. a first bypass hole; 14. an iron core; 15. a field coil; 16. a main flow channel; 17. a first drive gear; 18. a second bypass hole; 19. a piston head; 20. a piston rod.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
A novel magneto-rheological shock absorber is shown in figures 1-5 and comprises a working cylinder 2, a piston 1, a flow baffle 6 and magneto-rheological fluid.
The working cylinder barrel 2 is internally provided with an adjacent piston cavity and a motor cavity 3. The piston cavity and the motor cavity 3 are separated by an annular partition plate.
The piston 1 comprises a piston head 19 and a piston rod 20, the piston head 19 is arranged in a piston cavity, a piston upper cavity 7 is arranged above the piston head 19, a piston lower cavity 8 is arranged below the piston head 19, an iron core 14 and an excitation coil 15 are arranged on the piston head 19, a plurality of first side through holes 13 which are longitudinally communicated are uniformly distributed on the piston head 19, the bottom of the piston rod 20 is fixed with the piston head 19, the top of the piston rod penetrates through a motor cavity 3, a current baffle 6 is sleeved on the piston rod 20 and can move up and down along with the piston 1, a transmission mechanism is arranged in the motor cavity 3 and can drive the current baffle 6 to rotate relative to the piston 1, the current baffle 6 is uniformly distributed into a plurality of areas, the number of the areas is consistent with that of the first side through holes 13, a group of second side through holes 18 is arranged in each area, at least one second side, in a plurality of regions, the number of the second bypass holes 18 in each group of the second bypass holes 18 is increased by one, the aperture size of each second bypass hole 18 is consistent with that of one first bypass hole 13, and the spacing angle between every two adjacent second bypass holes 18 in each group of the second bypass holes 18 is consistent.
The magnetorheological fluid is arranged in the piston cavity, and when the first bypass hole 13 and the second bypass hole 18 are communicated up and down, the magnetorheological fluid can flow out from the second bypass hole 18 from the first bypass hole 13.
At the beginning, each first bypass hole 13 is aligned with one second bypass hole 18 in each area, and the transmission mechanism drives the flow blocking device 6 to rotate relative to the piston 1, so that the number of the aligned first bypass holes 13 and second bypass holes 18 can be reduced, and the number of the opened first bypass holes 13 is reduced.
By reducing the number of the opened first bypass holes 13, the damping coefficient of the magnetorheological damper of the vehicle in the low-speed area of the piston 1 is adjusted, the damping coefficient of the magnetorheological damper is increased, and the smoothness and the control stability of the whole vehicle in the running process are improved.
According to the invention, the flow baffle 6 can be driven to rotate relative to the piston 1 through the transmission mechanism according to actual conditions, and the number of the first bypass holes 13 on the piston head 19 and the second bypass holes 18 on the flow baffle 6 which are aligned is selected, so that the condition that the gravity center of the vehicle moves under different loads and different road conditions is adapted, and the smoothness and the control stability of the vehicle are improved.
In the process of the up-and-down movement of the piston 1, the magnetorheological fluid is squeezed, and the piston 1 is easily blocked. In order to solve the problem that the piston 1 is stuck in the vertical movement, the invention is also provided with a floating piston 91, the floating piston 91 is arranged between the piston head 19 and the working cylinder 2, the floating piston 91, an air cavity between the floating piston 91 and the working cylinder 2 form an energy accumulator 11, the pressure of the piston cavity can be reduced by the downward movement of the floating piston 91, and the downward movement of the floating piston 91 can increase the pressure of the air cavity between the floating piston 91 and the working cylinder 2 to accumulate energy.
The floating piston 91 comprises a floating piston 91 main body, a drying bag and a rubber gasket 10, an annular groove is formed in the middle of the cylinder of the floating piston 91, and the drying bag and the rubber gasket 10 are arranged in the annular groove. The rubber gasket 10 can play a sealing role, the drying bag can effectively absorb moisture and air infiltrated in the working process of the shock absorber, and the magnetorheological fluid in the shock absorber is prevented from being deteriorated or degraded due to the influence of the moisture and the air.
Preferably, referring to fig. 1, the transmission mechanism includes a transmission motor 4, a first transmission gear 17 and a second transmission gear 5, the transmission motor 4 is fixed on the piston rod 20, the first transmission gear 17 is installed on the output shaft of the transmission motor 4, and the second transmission gear 5 is installed on the flow stopper 6 and meshed with the first transmission gear 17. The first transmission gear 17 is driven to rotate through the transmission motor 4, and then the second transmission gear 5 is driven to rotate, so that the flow blocking device 6 is driven to rotate relative to the piston 1, and the number of the first bypass holes 13 and the second bypass holes 18 relative to the piston is changed.
Preferably, the flow blocking device 6 comprises a flow blocking sleeve and a flow blocking plate fixed at the bottom of the flow blocking sleeve, the flow blocking sleeve and the flow blocking plate are sleeved on the piston rod 20, the second transmission gear 5 is installed on the flow blocking sleeve, and the plurality of groups of second bypass holes 18 are formed in the flow blocking sleeve.
Referring to fig. 2, the piston head 19 is further provided with a piston housing 12, a main flow passage 16 is arranged between the piston housing 12 and the piston head 19, and the magnetorheological fluid can flow out of the main flow passage 16. Normally, the main flow passage 16 is open at all times, and when the first bypass hole 13 and the second bypass hole 18 are aligned, a sub flow passage is formed, and the magnetorheological fluid can flow out from the second bypass hole 18 from the first bypass hole 13.
The present invention also provides a vehicle ride comfort control method, as shown in fig. 3, 5 and 6, including:
step 1, mounting four novel magneto-rheological shock absorbers on a vehicle, wherein the four novel magneto-rheological shock absorbers comprise two front shock absorbers and two rear shock absorbers;
step 2, setting an initial state that only a front row has a person and a rear row has no luggage and other passengers in the vehicle, controlling the flow damper 6 in the front shock absorber to rotate by the controller, so that the number of the aligned first bypass holes 13 and the aligned second bypass holes 18 in the front shock absorber is 0, namely the number of the opened first bypass holes 13 in the front shock absorber is 0, controlling the flow damper 6 in the rear shock absorber to rotate by the controller, so that each first bypass hole 13 in the rear shock absorber is aligned with one second bypass hole 18 in each area, namely all the first bypass holes 13 in the rear shock absorber are opened, and in the rear shock absorber, magnetorheological fluid can flow out of all the first bypass holes 13;
step 3, determining the distance of the backward movement of the gravity center according to the difference value of the increased weight of the rear row and the increased weight of the front row in the actual vehicle running process, determining the number of the opened first bypass holes 13 of the front shock absorber and the rear shock absorber according to the distance of the backward movement of the gravity center, and controlling the flow damper 6 in the rear shock absorber to rotate by the controller when the increased weight of the rear row is more than that of the front row so as to reduce the number of the opened first bypass holes 13 in the rear shock absorber;
and 4, judging the road condition, if the vehicle runs on a good road surface, the controller controls the front shock absorber and the rear shock absorber to simultaneously close the first bypass holes 13 with the same number on the previous basis according to the road condition, and if the vehicle runs on a poor road surface, the controller controls the front shock absorber and the rear shock absorber to simultaneously open the second bypass holes 18 with the same number on the previous basis according to the road condition.
In step 1, when the controller controls the front shock absorbers, the two front shock absorbers are simultaneously controlled, and when the controller controls the rear shock absorbers, the two rear shock absorbers are simultaneously controlled.
In step 3, setting the distance of the backward movement of the gravity center as d, the spacing angle of two adjacent second bypass holes 18 as alpha, the difference value of the increased weight of the rear row and the increased weight of the front row as m, the number of the first bypass holes 13 on the front shock absorber and the rear shock absorber as s, determining the distance of the backward movement of the gravity center according to the increased weight of the rear row compared with the front row, when 0< m > n, the distance of the backward movement of the gravity center 0< d > l, the flow baffle 6 in the rear shock absorber does not rotate, controlling the number of the opened first bypass holes 13 in the rear shock absorber to be more than the number of the opened first bypass holes 13 in the front shock absorber by the controller, when n < m > 2n, the distance of the backward movement of the gravity center l < d > 2l, the flow baffle 6 in the rear shock absorber rotates alpha, controlling the number of the opened first bypass holes 13 in the rear shock absorber to be more than the number of opened first bypass holes 13 in the front shock absorber by s-1 by the, when m is more than 2n and less than or equal to 3n, the distance of the backward movement of the gravity center is more than 2l and less than or equal to 3l, the flow baffle 6 in the rear shock absorber rotates by 2 alpha, the controller controls the number of the opened first side through holes 13 in the rear shock absorber to be more than the number of the opened first side through holes 13 in the front shock absorber by s-2, when m is more than 3n and less than or equal to 4n, the distance of the backward movement of the gravity center is more than 3l and less than or equal to 4l, the flow baffle 6 in the rear shock absorber rotates by 3 alpha, the controller controls the number of the opened first side through holes 13 in the rear shock absorber to be more than the number of the opened first side through holes 13 in the front shock absorber by s-3, when m is larger than 4n and smaller than or equal to 5n, the distance of the backward movement of the gravity center is larger than 4l and smaller than or equal to 5l, the flow baffle 6 in the rear shock absorber rotates by 4 alpha, the controller controls the number of the opened first side through holes 13 in the rear shock absorber to be s-4 more than the number of the opened first side through holes 13 in the front shock absorber, and the like.
In one embodiment, in the novel magnetorheological damper, 4 first bypass holes 13 are uniformly distributed on the piston head 19, the interval angle between every two adjacent first bypass holes 13 is 90 degrees, 4 areas are uniformly distributed on the flow baffle 6, the number of each group of second bypass holes 18 in the 4 areas is 1, 2, 3 and 4 respectively, and the interval angle between every two adjacent second bypass holes 18 in each group of second bypass angles is 15 degrees.
At the beginning, 4 first bypass holes 13 are aligned with 4 second bypass holes 18, 4 first bypass holes 13 are opened, the flow baffle 6 is driven by a transmission mechanism to rotate 15 degrees relative to the piston 1, 3 first bypass holes 13 are aligned with 3 second bypass holes 18, 3 first bypass holes 13 are opened, 30 degrees of rotation is performed to align 2 first bypass holes 13 with 2 second bypass holes 18, 2 first bypass holes 13 are opened, 45 degrees of rotation is performed to align 1 first bypass hole 13 with 1 second bypass hole 18, 1 first bypass hole 13 is opened, 15 degrees of rotation is performed to align the number of the first bypass holes 13 with the second bypass holes 18 to be 0, and 0 first bypass hole 13 is opened.
In this embodiment, the spacing angle between two adjacent second bypass holes 18 is 15 degrees, and the number s of the first bypass holes 13 in both the front and rear shock absorbers is 4, where n is 65 kg.
In the initial state, only a person is in the front row and no luggage and other passengers are in the rear row in the vehicle, the controller controls the flow blocking device 6 in the front shock absorber to rotate, so that the number of the first bypass holes 13 and the second bypass holes 18 in the front shock absorber are aligned to be 0, the number of the first bypass holes 13 in the front shock absorber which are opened is 0, the controller controls the flow blocking device 6 in the rear shock absorber to rotate, so that each first bypass hole 13 in the rear shock absorber is aligned with one second bypass hole 18 in each area, and the number of the first bypass holes 13 in the rear shock absorber which are opened is 4.
The increased weight of the rear row compared with the front row is 0< m < 65kg, the backward movement distance of the gravity center is 0< d < l, the number of the opened first bypass holes 13 in the front shock absorber is controlled by the controller to be 0, the rear shock absorber flow blocking device 6 does not rotate, the number of the opened first bypass holes 13 in the rear shock absorber is 4, the damping requirements of the front shock absorber and the rear shock absorber under common working conditions are met, and the driving smoothness and the control stability of the vehicle are improved.
The increased weight of the rear row compared with the front row is 65kg < m < 130kg, the backward movement distance of the gravity center is l < d < 2l, the number of the first side through holes 13 in the front shock absorber is controlled by the controller to be 0, the rear shock absorber flow baffle 6 rotates for 15 degrees, the number of the first side through holes 13 in the rear shock absorber is 3, the damping requirements of the front shock absorber and the rear shock absorber under common working conditions are met, and the driving smoothness and the control stability of the vehicle are improved.
The increased weight of the rear row compared with the front row is 130kg < m < 195kg, the distance of the backward movement of the gravity center is 2l < d < 3l, the number of the opened first side through holes 13 in the front shock absorber is controlled by the controller to be 0, the rear shock absorber flow baffle 6 rotates by 30 degrees, the number of the opened first side through holes 13 in the rear shock absorber is 2, the damping requirements of the front shock absorber and the rear shock absorber under the common working condition are met, and the driving smoothness and the control stability of the vehicle are improved.
The increased weight of the rear row compared with the front row is 195kg < m < 260kg, the distance of the gravity center backward movement is 3l < d < 4l, the number of the first bypass holes 13 in the front shock absorber is controlled by the controller to be 0, the rear shock absorber damper 6 rotates for 45 degrees, the number of the first bypass holes 13 in the rear shock absorber is 1, the damping requirements of the front shock absorber and the rear shock absorber under common working conditions are met, and the driving smoothness and the control stability of the vehicle are improved.
The increased weight of the rear row compared with the front row is 260kg < m < 325kg, the backward movement distance of the gravity center is 4l < d < 5l, the number of the first bypass holes 13 in the front shock absorber is controlled by the controller to be 0, the rear shock absorber flow baffle 6 rotates by 60 degrees, the number of the first bypass holes 13 in the rear shock absorber to be 0 is achieved, the damping requirements of the front shock absorber and the rear shock absorber under common working conditions are met, and the driving smoothness and the control stability of the vehicle are improved.
The rear row is compared in the weight that the front row increases and is more than 325kg, and the distance d that the focus moves backward is more than 5l, and preceding bumper shock absorber fender ware 6 reverse rotation 15 degrees, and the number that first by-pass hole 13 was opened in the bumper shock absorber before the controller control is 1, realizes that the number that first by-pass hole 13 was opened in the bumper shock absorber is 0, accords with the bumper shock absorber damping requirement around under the general operating mode, improves vehicle ride comfort and controls stability.
If an occupant gets more than 65kg and less than 130kg in the rear row of the vehicle, the number of the first bypass holes 13 opened in the rear shock absorber is required to be 3 more than the number of the first bypass holes 13 opened in the rear shock absorber.
Judging the road surface condition, determining that the front shock absorber and the rear shock absorber close or open the same number of first bypass holes 13 at the same time, and if the road surface is good, keeping the number of the first bypass holes 13 of the front shock absorber and the rear shock absorber unchanged, so that the damping force of the front shock absorber and the rear shock absorber is improved, and the control stability of the vehicle is ensured; and on the poor road surface, under the great condition of external excitation, a first bypass hole 13 is all opened to preceding bumper shock absorber and rear shock absorber on the basis in the past, and the number that first bypass hole 13 was opened in the bumper shock absorber before controlling promptly is 1, and the number that first bypass hole 13 was opened in the rear shock absorber is 4 to reduce the damping force of preceding bumper shock absorber and rear shock absorber, guarantee the riding comfort of vehicle. The control of the damping force of the vehicle suspension is realized through the control, and the damping force of the ideal shock absorber under various working conditions is obtained, so that the different loads of the vehicle, the smoothness under different road conditions and the control stability are improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. A novel magneto-rheological shock absorber is characterized in that: the magnetorheological fluid damper comprises a working cylinder, a piston, a flow damper and magnetorheological fluid, wherein adjacent piston cavities and motor cavities are arranged in the working cylinder, the piston comprises a piston head and a piston rod, the piston head is arranged in the piston cavity, an iron core and an excitation coil are arranged on the piston head, a plurality of first side through holes which are longitudinally communicated are uniformly distributed on the piston head, the bottom of the piston rod is fixed with the piston head, the top of the piston rod penetrates out of the motor cavity, the flow damper is sleeved on the piston rod and can move up and down along with the piston, a transmission mechanism is arranged in the motor cavity and can drive the flow damper to rotate relative to the piston, a plurality of areas are uniformly distributed on the flow damper, the number of the areas is consistent with that of the first side through holes, a group of second side through holes are arranged in each area, and at least one second side through hole which is longitudinally communicated is arranged in one, the magnetorheological fluid damper comprises a piston, a first bypass hole, a second bypass hole, a magnetorheological fluid chamber and a magnetorheological fluid chamber, wherein the number of the second bypass holes in each group of second bypass holes is increased by one in sequence in each group, each second bypass hole is consistent with the size of the first bypass hole, every two adjacent second bypass holes in each group of second bypass holes are consistent in angle interval, each first bypass hole is aligned with each second bypass hole in each group at the beginning, all the first bypass holes are opened, the damper is driven by a transmission mechanism to rotate relative to the piston, the number of the aligned first bypass holes and the aligned second bypass holes can be reduced, the number of the opened first bypass holes is further reduced, the magnetorheological fluid is arranged in the piston chamber, and the magnetorheological fluid can flow out from the first bypass holes to the second bypass holes.
2. The new magnetorheological damper of claim 1, wherein: the floating piston is arranged between the piston head and the working cylinder barrel, and an air cavity between the floating piston and the working cylinder barrel forms an energy accumulator.
3. The new magnetorheological damper of claim 2, wherein: the floating piston comprises a floating piston main body, a drying bag and a rubber gasket, an annular groove is formed in the middle of a floating piston cylinder, and the drying bag and the rubber gasket are arranged in the annular groove.
4. The new magnetorheological damper of claim 1, wherein: the transmission mechanism comprises a transmission motor, a first transmission gear and a second transmission gear, the transmission motor is fixed on the piston rod, the first transmission gear is installed on an output shaft of the transmission motor, and the second transmission gear is installed on the flow blocking device and meshed with the first transmission gear.
5. The new magnetorheological damper of claim 4, wherein: the flow blocking device comprises a flow blocking sleeve and a flow blocking plate fixed at the bottom of the flow blocking sleeve, the flow blocking sleeve and the flow blocking plate are sleeved on the piston rod, the second transmission gear is installed on the flow blocking sleeve, and a plurality of groups of second bypass holes are formed in the flow blocking sleeve.
6. The new magnetorheological damper of claim 1, wherein: the magnetorheological fluid damper is characterized in that a piston shell is further arranged on the piston head, a main flow channel is arranged between the piston shell and the piston head, and the magnetorheological fluid can flow out of the main flow channel.
7. A method for controlling ride comfort of a vehicle using the new magnetorheological damper of any one of claims 1-6, comprising:
step 1, mounting four novel magneto-rheological shock absorbers on a vehicle, wherein the four novel magneto-rheological shock absorbers comprise two front shock absorbers and two rear shock absorbers;
step 2, setting an initial state that only a front row has a person and a rear row has no luggage and other passengers in the vehicle, controlling a flow damper in a front shock absorber to rotate by a controller, enabling the number of aligned first bypass holes and second bypass holes in the front shock absorber to be 0, namely the number of opened first bypass holes in the front shock absorber to be 0, controlling the flow damper in a rear shock absorber to rotate by the controller, enabling each first bypass hole in the rear shock absorber to be aligned with one second bypass hole in each area, namely all first bypass holes in the rear shock absorber to be opened, and enabling magnetorheological fluid to flow out of all first bypass holes in the rear shock absorber;
step 3, determining the distance of the backward movement of the gravity center according to the difference value of the increased weight of the rear row and the increased weight of the front row in the actual vehicle driving process, determining the number of the opened first bypass holes of the front shock absorber and the rear shock absorber according to the distance of the backward movement of the gravity center, and controlling the flow damper in the rear shock absorber to rotate by the controller when the increased weight of the rear row is more than that of the front row so as to reduce the number of the opened first bypass holes in the rear shock absorber;
and 4, judging the road condition, if the vehicle runs on a better road surface, controlling the front shock absorber and the rear shock absorber to simultaneously close the first bypass holes with the same number on the previous basis by the controller according to the road condition, and if the vehicle runs on a poorer road surface, controlling the front shock absorber and the rear shock absorber to simultaneously open the second bypass holes with the same number on the previous basis by the controller according to the road condition.
8. The vehicle ride control method according to claim 7, wherein: in step 3, setting the distance of the backward movement of the gravity center as d, the spacing angle between two adjacent second bypass holes as alpha, the difference between the increased weight of the rear row and the increased weight of the front row as m, the number of first bypass holes on the front shock absorber and the rear shock absorber as s, determining the distance of the backward movement of the gravity center according to the increased weight of the rear row compared with the front row, when m is more than 0 and less than n, the distance of the backward movement of the gravity center is more than 0 and less than l, the flow baffle in the rear shock absorber does not rotate, controlling the number of the opened first bypass holes in the rear shock absorber to be more than the number of the opened first bypass holes in the front shock absorber by s by 1 by the controller, when n is more than m and less than 2n, the distance of the backward movement of the gravity center is less than l and less than 2l, the flow baffle in the rear shock absorber rotates by alpha, controlling the number of the opened first bypass holes in the rear shock absorber to be more than the number of the opened first bypass holes in the, the gravity center backward movement distance is 2l < d is less than or equal to 3l, the flow baffle in the rear shock absorber rotates by 2 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be more than the number of the opened first side through holes in the front shock absorber by s-2, when 3n < m is less than or equal to 4n, the gravity center backward movement distance is 3l < d is less than or equal to 4l, the flow baffle in the rear shock absorber rotates by 3 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be more than the number of the opened first side through holes in the front shock absorber by s-3, when 4n < m is less than or equal to 5n, the gravity center backward movement distance is 4l < d is less than or equal to 5l, the flow baffle in the rear shock absorber rotates by 4 alpha, the controller controls the number of the opened first side through holes in the rear shock absorber to be more than the number of the.
9. The vehicle ride control method according to claim 8, wherein: in the novel magneto-rheological damper, the piston head is evenly distributed with 4 first bypass holes, the interval angle between the adjacent first bypass holes is 90 degrees, the flow blocking device is evenly distributed with 4 areas, 4 in the areas, the number of the second bypass holes in each group is 1, 2, 3 and 4 respectively, and in each group of the second bypass angles, every two adjacent interval angles between the second bypass holes are 15 degrees.
10. The vehicle ride control method according to claim 9, wherein: at the beginning, 4 first bypass hole and 4 the second bypass hole is aligned, opens 4 first bypass hole, through drive mechanism drives the flow baffle for the piston rotates 15 degrees, realizes 3 first bypass hole and 3 the second bypass hole is aligned, opens 3 first bypass hole rotates 30 degrees and realizes 2 first bypass hole and 2 the second bypass hole is aligned, opens 2 first bypass hole, rotates 45 degrees and realizes 1 first bypass hole and 1 the second bypass hole is aligned, opens 1 first bypass hole, rotates 60 degrees and realizes the number of first bypass hole with the second bypass hole is 0, opens 0 first bypass hole.
CN202011576446.0A 2020-12-28 2020-12-28 Novel magneto-rheological damper and vehicle ride comfort control method Active CN112747074B (en)

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US20130180813A1 (en) * 2012-01-13 2013-07-18 Eustace Moore, JR. Fluid-filled shock absorber
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