CN111469678A - Motion control device of electric vehicle - Google Patents

Motion control device of electric vehicle Download PDF

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Publication number
CN111469678A
CN111469678A CN202010366854.7A CN202010366854A CN111469678A CN 111469678 A CN111469678 A CN 111469678A CN 202010366854 A CN202010366854 A CN 202010366854A CN 111469678 A CN111469678 A CN 111469678A
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China
Prior art keywords
control device
electric vehicle
motion control
rods
plates
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202010366854.7A
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Chinese (zh)
Inventor
尚明玲
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Weifang University of Science and Technology
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Weifang University of Science and Technology
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Publication date
Application filed by Weifang University of Science and Technology filed Critical Weifang University of Science and Technology
Priority to CN202010366854.7A priority Critical patent/CN111469678A/en
Publication of CN111469678A publication Critical patent/CN111469678A/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Manipulator (AREA)

Abstract

The invention belongs to the field of electric vehicle control devices, in particular to a motion control device of an electric vehicle, which aims at the problems that the efficiency is low when the existing motion control device of the electric vehicle is installed, most of the motion control device is fixedly installed, the buffer effect is difficult to play, the damage is easy, and the machine fault is caused because the temperature is easily overhigh when the control device is used for a long time. The invention has simple structure and convenient use, can control the installation of the device more conveniently, and can buffer and cool the control device, thereby being beneficial to people.

Description

Motion control device of electric vehicle
Technical Field
The invention relates to the technical field of electric vehicle control devices, in particular to a motion control device of an electric vehicle.
Background
In order to meet the strategic requirements of national environmental protection, electric vehicles such as electric automobiles are rapidly developing. Whether the design of a control system of an electric vehicle can ensure the safety of the whole vehicle to the maximum degree is a factor which is mainly considered when people buy the electric vehicle.
The conventional motion control device of the electric vehicle is low in efficiency when being installed, most of the motion control device is fixedly installed, the motion control device is difficult to play a role in buffering and is easy to damage, and when the motion control device is used for a long time, the temperature is easy to be overhigh, and machine faults are caused, so that the motion control device of the electric vehicle is provided.
Disclosure of Invention
The invention aims to solve the defects that the prior motion control device of an electric vehicle is low in efficiency when being installed, most of the motion control device is fixedly installed, is difficult to play a role of buffering and is easy to damage, and the control device is easy to cause machine failure due to overhigh temperature when being used for a long time.
In order to achieve the purpose, the invention adopts the following technical scheme:
a motion control device of an electric vehicle comprises a shell, wherein the top of the shell is provided with an opening, positioning plates are fixedly arranged on the inner walls of two sides of the shell, ejector rods are connected on the positioning plates in a sliding manner, the top ends of the two ejector rods are fixedly provided with the same cover plate, air inlet holes are formed in two sides of the shell, a filter plate is fixedly arranged on the inner wall of each air inlet hole, a fixed rod is fixedly arranged on the inner wall of each air inlet hole, a first rotating rod is rotatably connected onto the fixed rod, an air inlet fan blade is fixedly arranged on the first rotating rod, the first rotating rod is in transmission connection with the corresponding ejector rod, a motor is fixedly arranged on one side of the shell, a second rotating rod is fixedly arranged on an output shaft of the motor, two symmetrically arranged fixing seats are fixedly arranged on the inner wall of the bottom of the shell, the fixing, the top of kicking block is equipped with controlling means, fixed mounting has the fixed plate that two symmetries set up on the bottom inner wall of casing, and sliding connection has the clamping bar on the fixed plate, and the equal sliding connection of one end that two clamping bars are close to each other has splint, and splint cooperate with controlling means.
Preferably, the outside threaded connection of ejector pin has first conical gear, and first conical gear rotates with the locating plate that corresponds to be connected, and the equal fixed mounting of one end that two first bull sticks are close to each other has second conical gear, first conical gear and second conical gear intermeshing, and pivoted first bull stick can drive the ejector pin through the intermeshing of first conical gear and second conical gear and remove.
Preferably, the fixed cover in the outside of first bull stick all is equipped with first belt pulley, and the fixed cover in the outside of second bull stick is equipped with the second belt pulley that two symmetries set up, and transmission connection has same belt on first belt pulley and the second belt pulley that corresponds, and pivoted second bull stick can be connected through the transmission of first belt pulley, second belt pulley and belt and drive first bull stick and rotate.
Preferably, the sliding tray has been seted up at the top of fixing base, sliding tray and the kicking block sliding connection who corresponds, and fixed mounting has supporting spring on the bottom inner wall of sliding tray, supporting spring's top and kicking block fixed connection, and supporting spring can support and cushion controlling means through the kicking block.
Preferably, the limiting groove has all been seted up on the both sides inner wall of sliding tray, and sliding connection has the stopper in the limiting groove, stopper and the kicking block fixed connection that corresponds, and the limiting groove can be spacing to the kicking block with the stopper.
Preferably, sliding connection has the buffer beam that two symmetries set up on the apron, and the bottom and the equal fixed mounting in top of buffer beam have the baffle, and the bottom fixed mounting of apron has the buffer spring that two symmetries set up, buffer spring's bottom and the baffle fixed connection who corresponds, and buffer spring can support and fix controlling means through the baffle.
Preferably, the moving grooves are formed in the ends, far away from each other, of the two clamping plates, the moving grooves are connected with the corresponding clamping rods in a sliding mode, the inner walls of the two sides of the two moving grooves are fixedly provided with the top springs, one ends of the top springs are fixedly connected with the corresponding clamping rods, and the clamping rods can clamp and fix the control device through the clamping plates.
Preferably, the equal fixed mounting of one end that two clamping bars kept away from each other has the swash plate, and the swash plate cooperatees with the ejector pin that corresponds, and the equal fixed mounting in one side that two swash plates are close to each other has reset spring, reset spring's one end and the fixed plate fixed connection that corresponds, and the ejector pin that removes can promote the clamping bar through the swash plate and remove.
According to the motion control device of the electric vehicle, due to the matching of the inclined plate and the ejector rod, the movable ejector rod can drive the two clamping rods to approach each other, so that the motion control device is clamped and fixed through the two clamping plates;
the first belt pulley, the second belt pulley and the belt are in transmission connection, so that the rotating second rotating rod can drive the first rotating rod to rotate, and further drive the air inlet fan blades to blow air and cool the moving device;
simultaneously because the intermeshing of first conical tooth wheel and second conical tooth wheel, and the threaded connection of first conical tooth wheel and ejector pin for pivoted first bull stick can drive the ejector pin and remove, and then carries out the transmission through the ejector pin and connect.
The invention has simple structure and convenient use, can control the installation of the device more conveniently, and can buffer and cool the control device, thereby being beneficial to people.
Drawings
Fig. 1 is a schematic structural diagram of a motion control device of an electric vehicle according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of a motion control apparatus for an electric vehicle according to the present invention;
fig. 3 is a schematic perspective view of a motion control device of an electric vehicle according to the present invention;
fig. 4 is a schematic structural diagram of a portion a of a motion control apparatus for an electric vehicle according to the present invention;
fig. 5 is a schematic structural diagram of a part B of a motion control device of an electric vehicle according to the present invention.
In the figure: the air inlet and outlet device comprises a shell 1, a positioning plate 2, a push rod 3, a cover plate 4, a buffer rod 5, a baffle 6, a buffer spring 7, an air inlet hole 8, a filter plate 9, a fixing rod 10, a first rotating rod 11, an air inlet fan blade 12, a motor 13, a first rotating rod 14, a fixing seat 15, a sliding groove 16, a top block 17, a supporting spring 18, a control device 19, a fixing plate 20, a clamping rod 21, a clamping plate 22, an inclined plate 23, a first conical gear 24 and a second conical gear 25.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
Referring to fig. 1-5, a motion control device for an electric vehicle comprises a housing 1, an opening is provided at the top of the housing 1, positioning plates 2 are fixedly mounted on the inner walls of both sides of the housing 1, ejector rods 3 are slidably connected to the positioning plates 2, the top ends of the two ejector rods 3 are fixedly mounted with a same cover plate 4, air inlet holes 8 are provided at both sides of the housing 1, filter plates 9 are fixedly mounted on the inner walls of the air inlet holes 8, a fixing rod 10 is fixedly mounted on the inner wall of the air inlet hole 8, a first rotating rod 11 is rotatably connected to the fixing rod 10, an air inlet fan blade 12 is fixedly mounted on the first rotating rod 11, the first rotating rod 11 is in transmission connection with the corresponding ejector rod 3, a motor 13 is fixedly mounted at one side of the housing 1, a second rotating rod 14 is fixedly mounted on the output shaft of the motor 13, two symmetrically arranged fixing seats 15 are fixedly mounted on, and the top sliding connection of fixing base 15 has kicking block 17, and the top of kicking block 17 is equipped with controlling means 19, and fixed mounting has two fixed plates 20 that the symmetry set up on the bottom inner wall of casing 1, and sliding connection has clamping bar 21 on fixed plate 20, and the equal sliding connection of one end that two clamping bar 21 are close to each other has splint 22, and splint 22 and controlling means 19 cooperate.
In the invention, the outer side of the push rod 3 is in threaded connection with a first bevel gear 24, the first bevel gear 24 is in rotary connection with the corresponding positioning plate 2, two second bevel gears 25 are fixedly mounted at the mutually close ends of the two first rotating rods 11, and the first bevel gear 24 and the second bevel gears 25 are mutually meshed.
In the invention, the outer sides of the first rotating rods 11 are fixedly sleeved with first belt pulleys, the outer sides of the second rotating rods 14 are fixedly sleeved with two second belt pulleys which are symmetrically arranged, and the first belt pulleys and the corresponding second belt pulleys are in transmission connection with the same belt.
In the invention, the top of the fixed seat 15 is provided with a sliding groove 16, the sliding groove 16 is connected with a corresponding top block 17 in a sliding manner, the inner wall of the bottom of the sliding groove 16 is fixedly provided with a supporting spring 18, and the top end of the supporting spring 18 is fixedly connected with the top block 17.
In the invention, the inner walls of the two sides of the sliding groove 16 are both provided with limiting grooves, limiting blocks are connected in the limiting grooves in a sliding mode, and the limiting blocks are fixedly connected with the corresponding top blocks 17.
According to the invention, two buffer rods 5 which are symmetrically arranged are slidably connected on a cover plate 4, baffle plates 6 are fixedly arranged at the bottom end and the top end of each buffer rod 5, two buffer springs 7 which are symmetrically arranged are fixedly arranged at the bottom of the cover plate 4, and the bottom ends of the buffer springs 7 are fixedly connected with the corresponding baffle plates 6.
In the invention, moving grooves are formed in the ends, away from each other, of the two clamping plates 22, the moving grooves are in sliding connection with the corresponding clamping rods 21, the inner walls of the two sides of the two moving grooves are fixedly provided with top springs, and one ends of the top springs are fixedly connected with the corresponding clamping rods 21.
In the invention, inclined plates 23 are fixedly arranged at the ends, far away from each other, of the two clamping rods 21, the inclined plates 23 are matched with the corresponding ejector rods 3, return springs are fixedly arranged at the sides, close to each other, of the two inclined plates 23, and one ends of the return springs are fixedly connected with the corresponding fixing plates 20.
Example 2
Referring to fig. 1-5, a motion control device of an electric vehicle comprises a housing 1, an opening is arranged at the top of the housing 1, positioning plates 2 are welded on the inner walls of two sides of the housing 1, ejector rods 3 are connected on the positioning plates 2 in a sliding manner, the top ends of the two ejector rods 3 are welded with a same cover plate 4, air inlet holes 8 are arranged at two sides of the housing 1, filter plates 9 are welded on the inner walls of the air inlet holes 8, fixed rods 10 are welded on the inner walls of the air inlet holes 8, first rotating rods 11 are connected on the fixed rods 10 in a rotating manner, air inlet fan blades 12 are welded on the first rotating rods 11, the first rotating rods 11 are in transmission connection with the corresponding ejector rods 3, a motor 13 is welded on one side of the housing 1, second rotating rods 14 are welded on the output shaft of the motor 13, two symmetrically arranged fixed seats 15 are welded on the inner wall of the bottom of the housing, the top of kicking block 17 is equipped with controlling means 19, and the welding has two fixed plates 20 that the symmetry set up on the bottom inner wall of casing 1, and sliding connection has clamping bar 21 on fixed plate 20, and the equal sliding connection of one end that two clamping bar 21 are close to each other has splint 22, and splint 22 cooperatees with controlling means 19.
In the invention, the outer side of the push rod 3 is in threaded connection with a first bevel gear 24, the first bevel gear 24 is in rotary connection with the corresponding positioning plate 2, two second bevel gears 25 are welded at the ends, close to each other, of the two first rotating rods 11, the first bevel gear 24 is meshed with the second bevel gears 25, and the rotating first rotating rods 11 can drive the push rod 3 to move through the mutual meshing of the first bevel gears 24 and the second bevel gears 25.
In the invention, the outer sides of the first rotating rods 11 are fixedly sleeved with first belt pulleys, the outer sides of the second rotating rods 14 are fixedly sleeved with two second belt pulleys which are symmetrically arranged, the first belt pulleys and the corresponding second belt pulleys are in transmission connection with the same belt, and the rotating second rotating rods 14 can drive the first rotating rods 11 to rotate through the transmission connection of the first belt pulleys, the second belt pulleys and the belts.
In the invention, the top of the fixed seat 15 is provided with a sliding groove 16, the sliding groove 16 is connected with a corresponding ejector block 17 in a sliding manner, the inner wall of the bottom of the sliding groove 16 is welded with a supporting spring 18, the top end of the supporting spring 18 is fixedly connected with the ejector block 17, and the supporting spring 18 can support and buffer a control device 19 through the ejector block 17.
In the invention, the inner walls of the two sides of the sliding groove 16 are respectively provided with a limiting groove, the limiting grooves are connected with limiting blocks in a sliding mode, the limiting blocks are fixedly connected with the corresponding top blocks 17, and the limiting grooves and the limiting blocks can limit the top blocks 17.
According to the invention, two buffer rods 5 which are symmetrically arranged are slidably connected to a cover plate 4, baffle plates 6 are welded at the bottom ends and the top ends of the buffer rods 5, two buffer springs 7 which are symmetrically arranged are welded at the bottom of the cover plate 4, the bottom ends of the buffer springs 7 are fixedly connected with the corresponding baffle plates 6, and the buffer springs 7 can support and fix a control device 19 through the baffle plates 6.
In the invention, moving grooves are formed in the ends, away from each other, of the two clamping plates 22, the moving grooves are connected with the corresponding clamping rods 21 in a sliding mode, the inner walls of the two sides of the two moving grooves are welded with the top springs, one ends of the top springs are fixedly connected with the corresponding clamping rods 21, and the clamping rods 21 can clamp and fix the control device 19 through the clamping plates 22.
In the invention, inclined plates 23 are welded at the ends, far away from each other, of the two clamping rods 21, the inclined plates 23 are matched with the corresponding ejector rods 3, return springs are welded at the sides, close to each other, of the two inclined plates 23, one ends of the return springs are fixedly connected with the corresponding fixing plates 20, and the movable ejector rods 3 can push the clamping rods 21 to move through the inclined plates 23.
In the invention, when the control device 19 needs to be installed, the control device 19 is placed on the top of the two ejector blocks 17, the motor 13 is started to be switched on and off, the output shaft of the motor 13 drives the second rotating rod 14 to rotate, the second rotating rod 14 drives the second belt pulley to rotate, the second belt pulley drives the belt to rotate, the first belt pulley drives the first rotating rod 11 to rotate, the first rotating rod 11 drives the air inlet fan blades 12 to rotate, the rotating air inlet fan blades 12 form air flow, so as to cool the control device 19, meanwhile, the rotating first rotating rod 11 drives the second bevel gear 25 to rotate, the second bevel gear 25 drives the first bevel gear 24 to rotate, because the first bevel gear 24 is in threaded connection with the ejector rod 3, the rotating first bevel gear 24 can drive the ejector rod 3 to move downwards, the movable ejector rod 3 drives the cover plate 4 to move downwards, thereby make apron 4 carry out gland seal to casing 1, the ejector pin 3 that removes simultaneously can drive two clamping bars 21 through swash plate 23 and be close to each other, and clamping bar 21 can drive splint 22 through the top spring and carry out the centre gripping to controlling means 19 to convenient fixing to controlling means 19 does benefit to people and uses.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. A motion control device of an electric vehicle comprises a shell (1) and is characterized in that an opening is formed in the top of the shell (1), positioning plates (2) are fixedly mounted on inner walls of two sides of the shell (1), ejector rods (3) are connected on the positioning plates (2) in a sliding mode, the top ends of the two ejector rods (3) are fixedly mounted with a same cover plate (4), air inlet holes (8) are formed in two sides of the shell (1), a filter plate (9) is fixedly mounted on the inner walls of the air inlet holes (8), a fixed rod (10) is fixedly mounted on the inner walls of the air inlet holes (8), a first rotating rod (11) is connected onto the fixed rod (10) in a rotating mode, air inlet fan blades (12) are fixedly mounted onto the first rotating rod (11), the first rotating rod (11) is in transmission connection with the corresponding ejector rods (3), and a motor (13) is fixedly mounted, fixed mounting has second bull stick (14) on the output shaft of motor (13), fixed mounting has fixing base (15) that two symmetries set up on the bottom inner wall of casing (1), and fixing base (15) rotate with second bull stick (14) and are connected, and the top sliding connection of fixing base (15) has kicking block (17), and the top of kicking block (17) is equipped with controlling means (19), fixed mounting has fixed plate (20) that two symmetries set up on the bottom inner wall of casing (1), and sliding connection has clamping bar (21) on fixed plate (20), and the equal sliding connection of one end that two clamping bar (21) are close to each other has splint (22), and splint (22) cooperate with controlling means (19).
2. The motion control device of the electric vehicle according to claim 1, wherein the outer side of the top rod (3) is connected with a first bevel gear (24) in a threaded manner, the first bevel gear (24) is rotatably connected with the corresponding positioning plate (2), one ends of the two first rotating rods (11) close to each other are fixedly provided with second bevel gears (25), and the first bevel gears (24) and the second bevel gears (25) are meshed with each other.
3. The motion control device of an electric vehicle as claimed in claim 1, wherein the first rotating rod (11) is fixedly sleeved with a first belt pulley on the outer side, the second rotating rod (14) is fixedly sleeved with two second belt pulleys symmetrically arranged on the outer side, and the first belt pulley and the corresponding second belt pulley are in transmission connection with the same belt.
4. The motion control device of the electric vehicle as claimed in claim 1, wherein a sliding groove (16) is formed at the top of the fixed seat (15), the sliding groove (16) is slidably connected with the corresponding top block (17), a supporting spring (18) is fixedly mounted on the inner wall of the bottom of the sliding groove (16), and the top end of the supporting spring (18) is fixedly connected with the top block (17).
5. The motion control device of the electric vehicle according to claim 4, wherein the inner walls of the two sides of the sliding groove (16) are respectively provided with a limiting groove, a limiting block is connected in the limiting groove in a sliding manner, and the limiting block is fixedly connected with the corresponding top block (17).
6. The motion control device of the electric vehicle according to claim 1, wherein two symmetrically arranged buffer rods (5) are slidably connected to the cover plate (4), the bottom ends and the top ends of the buffer rods (5) are fixedly provided with baffle plates (6), two symmetrically arranged buffer springs (7) are fixedly arranged at the bottom of the cover plate (4), and the bottom ends of the buffer springs (7) are fixedly connected with the corresponding baffle plates (6).
7. The motion control device of an electric vehicle according to claim 1, wherein the two clamp plates (22) are provided with moving grooves at ends far away from each other, the moving grooves are slidably connected with the corresponding clamping rods (21), and top springs are fixedly mounted on inner walls of two sides of the two moving grooves, and one ends of the top springs are fixedly connected with the corresponding clamping rods (21).
8. The motion control device of the electric vehicle according to claim 1, wherein the ends of the two clamping bars (21) far away from each other are fixedly provided with inclined plates (23), the inclined plates (23) are matched with the corresponding ejector rods (3), the sides of the two inclined plates (23) close to each other are fixedly provided with return springs, and one ends of the return springs are fixedly connected with the corresponding fixing plates (20).
CN202010366854.7A 2020-04-30 2020-04-30 Motion control device of electric vehicle Withdrawn CN111469678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010366854.7A CN111469678A (en) 2020-04-30 2020-04-30 Motion control device of electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010366854.7A CN111469678A (en) 2020-04-30 2020-04-30 Motion control device of electric vehicle

Publications (1)

Publication Number Publication Date
CN111469678A true CN111469678A (en) 2020-07-31

Family

ID=71757137

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010366854.7A Withdrawn CN111469678A (en) 2020-04-30 2020-04-30 Motion control device of electric vehicle

Country Status (1)

Country Link
CN (1) CN111469678A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102687A (en) * 2020-09-25 2020-12-18 山东交通职业学院 Visual model ware is used in financial accounting teaching

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102687A (en) * 2020-09-25 2020-12-18 山东交通职业学院 Visual model ware is used in financial accounting teaching

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Application publication date: 20200731

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