CN111520011A - Electric thrust system for vehicle door and electric thrust device thereof - Google Patents

Abstract

The invention discloses an electric thrust system for a vehicle door and an electric thrust device thereof, wherein the system comprises a controller, a sensor and the electric thrust device, the electric thrust device comprises a cylinder body, a thrust assembly and magnetorheological fluid, the cylinder body is provided with a cavity, the thrust assembly comprises a piston, a thrust rod and a coil, the piston is movably arranged in the cavity, one end of the thrust rod is connected with the piston, the other end of the thrust rod penetrates out of the cylinder body, the coil is wound on the piston and formed in the cylinder body, the piston is provided with a through hole, and the magnetorheological fluid is filled in the cavity; the sensor detects the moving object and then generates a feedback signal to the controller, and the controller controls the operation of the electric thrust device. Thereby, the opening of the door can be restricted in an active manner.

Description

Electric thrust system for vehicle door and electric thrust device thereof

technical field

The present invention relates to a vehicle door thrust technology, in particular to an electric thrust system for vehicle doors and an electric thrust device thereof.

Background technique

With the continuous increase in the number of cars, the existing roads have not been expanded equally, so various traffic accidents can be said to emerge in an endless stream. Casualties are more frequent.

Although the industry has developed various prompts or warning devices, such as the use of photographic lenses or the use of warning sounds to remind drivers or passengers, it is often caused by drivers or passengers who neglect the images or warning sounds of the photographic lens when opening the door. It is a pity that the car door is directly pushed open, causing the car from behind to respond too late. For taxi drivers, it is impossible to control the situation that passengers or children get off the car and open the car door in real time. design, but the structure is complex, the cost is high, and it has not been practically used in automobiles due to the testing stage.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an electric thrust system for a vehicle door, which can restrict the opening of the vehicle door in an active manner through the cooperation of various components, thereby reducing the occurrence of traffic accidents.

In order to achieve the above object, the present invention provides an electric thrust system for a vehicle door, comprising a controller, a sensor and an electric thrust device, the sensor is electrically connected to the controller; the electric thrust device is electrically Connected to the controller, the electric thrust device includes a cylinder, a thrust assembly and a magnetorheological fluid, the cylinder has a cavity, the thrust assembly includes a piston, a thrust rod and a coil, The piston is movably arranged inside the cavity, one end of the thrust rod is connected to the piston, and the other end penetrates the outside of the cylinder, the coil is wound around the piston and formed inside the cylinder, the The piston is provided with at least one through hole, and the magnetorheological fluid is filled in the cavity; wherein the sensor detects a moving object and generates a feedback signal to the controller, and the controller controls the Operation of the electric thrust device.

Optionally, the magnetorheological fluid operates as a brake assembly.

Optionally, it also includes a battery, which is electrically connected to the controller for providing power to the controller.

Optionally, the electric thrust device further includes a position sensing unit, the position sensing unit is disposed on the inner wall surface of the cylinder body corresponding to the movement range of the piston, and is electrically connected to the controller.

Optionally, there are multiple through holes, and the axis line of each through hole and the center line of the piston are parallel to each other.

Optionally, a plurality of wire accommodating grooves are provided on the outer peripheral surface of the piston, and the coil is surrounded in each of the wire accommodating grooves of the piston.

Optionally, one end of the cylinder body is sealed with a rear cover, and a fixing block is connected to the rear cover, and the other end of the cylinder is sealed with a front cover, and the front cover is opened. There is a shaft connection hole, and the other end of the thrust rod passes through the shaft connection hole.

Optionally, the sensor is one of an infrared radar, an ultrasonic radar, a millimeter-wave radar, a laser radar, an image sensor, or a combination thereof.

Another object of the present invention is to provide an electric thrust device, which is not only simple in structure, easy in installation, but also in quick response.

In order to achieve the above-mentioned other object, the present invention provides an electric thrust device, which includes a cylinder, a thrust assembly and a magnetorheological fluid, the cylinder has a cavity; the thrust assembly includes a piston , a thrust rod and a coil, the piston is movably arranged inside the cavity, one end of the thrust rod is connected to the piston, and the other end penetrates the outside of the cylinder, the coil is wound around the piston And formed inside the cylinder, the piston is provided with at least one through hole; the magnetorheological fluid is filled in the cavity.

Optionally, the magnetorheological fluid operates as a brake assembly.

Optionally, a position sensing unit is also included, and the position sensing unit is disposed on the inner wall surface of the cylinder body corresponding to the movement range of the piston.

Optionally, there are multiple through holes, and the axis line of each through hole and the center line of the piston are parallel to each other.

Optionally, a plurality of wire accommodating grooves are provided on the outer peripheral surface of the piston, and the coil is surrounded in each of the wire accommodating grooves of the piston.

Optionally, one end of the cylinder body is sealed with a rear cover, and a fixing block is connected to the rear cover, and the other end of the cylinder is sealed with a front cover, and the front cover is opened. There is a shaft connection hole, and the other end of the thrust rod passes through the shaft connection hole.

The present invention also has the following effects: by arranging the coil inside the cylinder, the overall volume is greatly reduced, thereby increasing the use field and range of the electric thrust device. With the arrangement of the position sensing unit, the position of the piston can be precisely controlled.

Description of drawings

FIG. 1 is a block diagram of an electric thrust system for a vehicle door according to the present invention.

Fig. 2 is the combined appearance view of the electric thrust device of the present invention.

FIG. 3 is a sectional view of the combined electric thrust device of the present invention.

FIG. 4 is a schematic diagram of the combination of the electric thrust system of the present invention applied to an automobile.

Fig. 5 is a sectional view (1) of the electric thrust device of the present invention in use state.

Fig. 6 is a sectional view (2) of the electric thrust device of the present invention in use state.

Fig. 7 is a graph showing the yield strength and current of the magnetorheological fluid of the present invention.

FIG. 8 is a graph showing the resistance and displacement of the electric thrust device and the mechanical thrust rod of the present invention.

In the picture:

10…Controller; 20…Sensor; 30…Electric thrust device; 31…Cylinder block; 311…Cavity; 312…Rear cover; 313…Fixing block; 314…Front cover; 315…Shaft connection hole; 32 ...thrust assembly; 321...piston; 322...thrust rod; 323...coil; 3211...through hole; car; 81...body; 82...door.

Detailed ways

The detailed description and technical content of the present invention are described below in conjunction with the accompanying drawings. However, the content shown in the accompanying drawings is only for reference and description, and is not intended to limit the present invention.

Referring to FIGS. 1 to 3 , the present invention provides an electric thrust system for a vehicle door and an electric thrust device thereof, wherein the electric thrust system for a vehicle door mainly includes a controller 10 , a sensor 20 and An electric thrust device 30 .

The controller 10 is an ECU (Electronic Control Unit) electronic control unit, also known as "trip computer", "vehicle computer", etc., which is the information of various states collected by the sensor 20 and sent to the ECU by the transmission line . After the ECU receives these signals, it will analyze various signals to know what state each component is in and how it operates, and then automatically calculate according to the pre-written program. In this state, it should be Let which executive components do what, and then send instructions to the executive components to command the executive components to work.

The sensor 20 is electrically connected to the aforementioned controller 10, and can be an infrared radar, an ultrasonic radar, a millimeter-wave radar, a laser radar, an image sensor, or a combination thereof.

The electric thrust device 30 is electrically connected to the aforementioned controller 10 , and mainly includes a cylinder 31 , a thrust assembly 32 and a magnetorheological fluid 33 . The cylinder 31 is substantially cylindrical, but not in such a manner. The shape is limited, there is a cavity 311 inside the cylinder 31, one end of the cylinder 31 is sealed with a rear cover 312, and a fixing block 313 is connected to the outside of the rear cover 312. The other end is sealed with a front cover 314 , and a shaft connection hole 315 is defined in the front cover 314 .

The thrust assembly 32 includes a piston 321 , a thrust rod 322 and a coil 323 , wherein the piston 321 is a cylinder, which is movably arranged inside the aforementioned cavity 311 , and at least a through hole 3211 is opened in the piston 321 In this embodiment, there are multiple through holes 3211 , the axis of each through hole 3211 and the center line of the piston 321 are parallel to each other, and a plurality of wire-accommodating grooves 3212 are opened on the outer peripheral surface of the piston 321 . One end of the thrust rod 322 is connected to the piston 321 , and the other end is passed through the shaft connection hole 315 of the front cover 314 to the outside of the cylinder 31 . internal.

The magnetorheological fluid 33 is filled in the aforementioned cavity 311 , which can work as a brake component. Please refer to FIG. 7 together. The magnetorheological fluid 33 (MRF) is mainly composed of a carrier fluid. , magnetic particles and interface active agent. When the magnetorheological fluid 33 is subjected to the action of a magnetic field, its magnetic particles will be arranged in a chain shape along the direction of the magnetic field, and the original Newton fluid (Newton fluid) will immediately become Bingham plastic. (Bingham plastic), its viscosity increases instantaneously. If the magnetic field disappears, it immediately returns to the original Newtonian fluid, and its response time is only a few milliseconds. The picture shows the change of coil current and fluid yield strength when the magnetorheological fluid imparts a full magnetic field. The carrier liquid can be oil, ethylene glycol or water; the magnetic particles can be iron-containing particles with a diameter of 1 μm to 10 μm.

The electric thrust device 30 of the present invention further includes a position sensing unit 34 , which is disposed on the inner wall surface of the cylinder 31 corresponding to the movement range of the piston 321 and is electrically connected to the aforementioned controller 10 for detecting the movement of the piston 321 . the location.

The electric thrust system for a vehicle door of the present invention further includes a battery 40, which is electrically connected to the aforementioned controller 10 to provide power to the controller 10. The battery 40 can be used after the engine of the vehicle is turned off and the power is cut off. , which can still provide power to the aforementioned controller 10 .

Please refer to FIG. 4 to FIG. 6 , which can be applied to a car 8 . The car has a body 81 and a door 82 , wherein the sensor 20 can be installed on the rear surface of the door 82 , and the controller 10 is installed on the door. Inside 82 , one end of the thrust rod 322 is fixed on the vehicle body 81 , and the cylinder 31 is arranged inside the front end of the door 82 , and the rotation of the cylinder 31 is prevented by the fixing block 313 .

After the door 82 is pushed to the outside during use, the sensor 20 will start to detect a moving object behind. When a moving object is detected, a feedback signal will be generated to the controller 10 , and the controller 10 will control the operation of the electric thrust device 30 .

The electric thrust device 30 uses the controller 10 to make the coil 323 change the magnetic field. When the coil 323 has a zero magnetic field, the magnetorheological fluid 33 at this time is in a low viscosity state. The fluid 33 can easily flow through the through holes 3211, and the piston 321 can move in the cavity 311, so that the door 82 can be opened (as shown in FIG. 6); on the contrary, when the coil 323 is a strong magnetic field In this case, the magnetorheological fluid 33 at this time is in a high viscosity state, so the magnetorheological fluid 33 cannot flow through the through holes 3211, so that the piston 321 is restricted or prevented from moving in the cavity 311. , the door 82 cannot be pushed open further to the outside.

Please refer to Figure 8, the relationship between thrust force (resistance) and displacement (thrust rod stroke), in which the traditional thrust rod controls the force of the pitch by changing the shape of the thrust rod body, and uses a buffer block to It is used as the hard stop point of the mechanism to control the total stroke of the thrust rod, as shown in the solid line trajectory in the figure. The electric thrust device 30 of the present invention changes the viscosity of the magnetorheological fluid 33 by increasing the current of the coil 323, so that the hydraulic mechanism generates resistance, and is then matched with a displacement meter to measure the stroke of the thrust rod 322 and the strength of the knots. And the total stroke of the mechanism can be changed by control, as shown in the moving track of the electric thrust rod (1). Among them, active current modulation can also be used to design the power of various knots, the number of knots and the control of the total stroke of the mechanism, and even the operating force to open or close the door 82 can be controlled. Thrust rod (2) moving track.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (14)

1. An electric thrust system for a vehicle door, comprising:

a controller;

a sensor electrically connected to the controller; and

the electric thrust device is electrically connected with the controller and comprises a cylinder body, a thrust assembly and magnetorheological fluid, the cylinder body is provided with a containing cavity, the thrust assembly comprises a piston, a thrust rod and a coil, the piston is movably arranged in the containing cavity, one end of the thrust rod is connected with the piston, the other end of the thrust rod penetrates out of the cylinder body, the coil is wound on the piston and formed in the cylinder body, the piston is provided with at least one through hole, and the magnetorheological fluid is filled in the containing cavity;

the sensor generates a feedback signal to the controller when detecting a moving object, and the controller controls the operation of the electric thrust device.

2. The electric thrust system for a vehicle door of claim 1 wherein the magnetorheological fluid operates as a brake assembly.

3. The electric thrust system for a vehicle door of claim 1 further comprising a battery electrically connected to the controller for providing power to the controller.

4. The electric thrust system for a vehicle door according to claim 1, wherein the electric thrust device further comprises a position sensing unit disposed on an inner wall surface of the cylinder corresponding to a movement range of the piston and electrically connected to the controller.

5. The electric thrust system for a vehicle door according to claim 1, wherein the through-hole is plural, and a shaft axis of each through-hole and a center axis of the piston are parallel to each other.

6. The electric thrust system for a vehicle door as claimed in claim 1, wherein a plurality of wire receiving grooves are formed on an outer circumferential surface of the piston, and the coil is wound around each of the wire receiving grooves of the piston.

7. The electric thrust system for a vehicle door according to claim 1, wherein one end of the cylinder body is hermetically covered with a rear cover, and a fixing block is connected to the rear cover, the other end of the cylinder body is hermetically covered with a front cover, a coupling hole is formed in the front cover, and the other end of the thrust rod is passed through the coupling hole.

8. The electric thrust system for a vehicle door of claim 1, wherein the sensor is one of an infrared radar, an ultrasonic radar, a millimeter wave radar, a laser radar, an image sensor, or a combination thereof.

9. An electric thrust device, comprising:

the cylinder body is provided with a containing cavity;

the thrust assembly comprises a piston, a thrust rod and a coil, wherein the piston is movably arranged in the cavity, one end of the thrust rod is connected with the piston, the other end of the thrust rod penetrates out of the cylinder body, the coil is wound on the piston and formed in the cylinder body, and the piston is provided with at least one through hole; and

a magnetorheological fluid filled in the cavity.

10. The electric thrust brake of claim 9 wherein the magnetorheological fluid is operable as a brake assembly.

11. The electric thrust brake of claim 9, further comprising a position sensing unit provided on an inner wall surface of the cylinder corresponding to a moving range of the piston.

12. The electric thrust brake of claim 9, wherein the through-hole is plural, and an axis of each through-hole is parallel to a center line of the piston.

13. The electric thrust brake of claim 9, wherein a plurality of wire receiving grooves are formed on the outer circumferential surface of the piston, and the coil is wound around each of the wire receiving grooves of the piston.

14. The electric thrust brake of claim 9, wherein one end of the cylinder is sealed and covered by a rear cover, and a fixed block is connected to the rear cover, and the other end of the cylinder is sealed and covered by a front cover, and a shaft hole is formed in the front cover, and the other end of the thrust rod is extended out of the shaft hole.

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