CN209739046U - Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking - Google Patents
Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking Download PDFInfo
- Publication number
- CN209739046U CN209739046U CN201920011909.5U CN201920011909U CN209739046U CN 209739046 U CN209739046 U CN 209739046U CN 201920011909 U CN201920011909 U CN 201920011909U CN 209739046 U CN209739046 U CN 209739046U
- Authority
- CN
- China
- Prior art keywords
- gear
- control unit
- electronic control
- automobile
- sensor
- Prior art date
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000002265 prevention Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002567 autonomic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Landscapes
- Regulating Braking Force (AREA)
Abstract
The utility model discloses a heavy automobile prevents swift current slope and emergency braking's auxiliary device, including emergency braking detection module, swift current slope detection module, electronic control unit ECU and braking actuating mechanism, wherein emergency braking detection module is used for detecting whether heavy automobile is in the emergency braking state, and swift current slope detection module is used for detecting whether heavy automobile is in the swift current slope state to detect data transmission and give electronic control unit ECU. And the electronic control unit ECU receives the data and controls the starting and stopping of the brake actuating mechanism to realize the auxiliary braking of the heavy-duty car. The utility model discloses compact structure, the function is abundant, and the reliable operation is fit for using in various air brake's heavy-duty car.
Description
Technical Field
The utility model belongs to the technical field of the car initiative safety auxiliary brake technique and specifically relates to an auxiliary device of heavy-duty car swift current slope and emergency braking is prevented.
background
with the development of automobile technology, the requirement for automobile safety performance is an important consideration in automobile development. According to research, in a plurality of traffic accidents, collision accidents such as rear-end collision account for more than 70%, and the loss to personnel and property is serious, and most of the collision accidents are caused by the fact that an automobile cannot stop in a short distance due to too long braking time during emergency braking; in addition, when the automobile, especially a heavy automobile, is on a slope, the automobile easily slips off the slope and damages the automobile and even personnel due to improper operation of a driver or no person in the automobile and forgetting to pull the hand brake; the utility model discloses air brake based on heavy-duty car provides one kind can realize the heavy-duty car simultaneously and prevent swift current slope and auxiliary brake's device.
at present, many researches on an automobile emergency braking auxiliary system are available, wherein an automobile emergency braking auxiliary system (publication number CN 108454400A) is proposed by zheng, the variable of an accelerator pedal moving between an initial position and an oil supply position is detected through a sensor, the detected variable value is converted into a detection signal and transmitted to a controller, and the controller starts an electronic brake through judgment and assists braking; penxiuguyan provides an emergency braking control system (publication number CN 108407782A) for an automobile, which can monitor the motion state of a running vehicle in real time, further judge whether a vacuum braking mechanism in the system needs to be started according to a collected driving state signal when the vehicle is judged to be in an emergency state, and generate a braking strategy matched with the current motion state of the automobile through signal analysis under the condition that the vacuum braking mechanism needs to be started, so that the braking distance is remarkably reduced, the stability and the safety of driving braking are effectively improved, but the device is too complex, and the load of the automobile is increased.
in addition, many learners research devices for preventing the automobile from sliding down the slope, wherein the learners have proposed a method and a system for controlling the electric automobile to slide down the slope (publication No. CN 108275153A), which determine whether the state of the electric automobile needs to enter the anti-sliding mode according to the opening degree of an accelerator pedal, the gear of an automobile gear shift lever and hall signals; when the electric automobile enters the anti-slope-slipping mode, calculating a given forward torque according to the slope slipping distance of the electric automobile and controlling a motor of the electric automobile to output the given forward torque, but the device is only applicable to the electric automobile and cannot be widely applied; jinzhilin has proposed the automatic back-sliding prevention device (publication No. CN 203460695U) of a manual fender car, when the car appears the back sliding, the car semi-axis drives the driving, driven gear, passes to the rotary disk by passing the power round pin, drives the main shaft and produces reverse angle displacement with the take-up reel through the one-way bearing, the pulling steel wire, drive original parking arresting gear, prevent the car from back sliding, but the device lacks the judgement to whether the car is in the swift current slope state and the opportunity of releasing the back-sliding prevention device, and is intelligent not enough.
SUMMERY OF THE UTILITY MODEL
the utility model aims to solve the technical problem that the structure to current heavy-duty car anti-slide slope system and emergency braking auxiliary system is complicated, the power consumption is high, intelligent degree low grade is not enough, has provided a heavy-duty car anti-slide slope and emergency braking's auxiliary device, compact structure, reliable operation, it is with low costs, and increase less component and can realize preventing slide slope and auxiliary braking dual function.
the utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
an auxiliary device for preventing heavy-duty car from sliding down a slope and performing emergency braking comprises an emergency braking detection module, a slope sliding detection module, an Electronic Control Unit (ECU) and a braking execution mechanism;
the emergency brake detection module comprises a brake pedal displacement sensor and a wheel speed sensor; the brake pedal displacement sensor is used for sensing the treading stroke of the automobile brake pedal and transmitting the treading stroke to the electronic control unit ECU; the wheel speed sensor is arranged on a vehicle wheel and used for sensing the rotating speed of the vehicle wheel and transmitting the rotating speed to the electronic control unit ECU;
the slope sliding detection module comprises a gear sensor, an accelerator opening sensor and a Hall sensor; the gear sensor is used for sensing the gear of the automobile gearbox and transmitting the gear to the electronic control unit ECU; the accelerator opening sensor is used for sensing the stroke of the automobile accelerator which is stepped on and transmitting the stroke to the electronic control unit ECU; the Hall sensors are arranged on the wheels of the automobile and used for sensing the rotation direction of the wheels of the automobile and transmitting the rotation direction to the electronic control unit ECU;
a push rod in the heavy-duty car air braking system is provided with threads;
The brake actuating mechanism comprises a planetary roller mechanism, a driving gear, a driven gear, an electromagnetic clutch and a motor;
the planetary roller mechanism comprises an inner gear ring, a sun gear, a planet carrier and a plurality of planet gears, wherein the inner gear ring, the plurality of planet gears and the sun gear are arranged from outside to inside and are matched with the planet carrier to form a planetary gear train;
The sun gear is an outer gear ring, threads matched with the threads on the push rod are arranged on the inner wall of the sun gear, and the inner wall of the sun gear is in threaded connection with the push rod;
The driven gear is an outer gear ring, and the inner wall of the driven gear is rigidly connected with the outer ring of the inner gear ring;
The output shaft of the motor is fixedly connected with the input shaft of the electromagnetic clutch, and the output shaft of the electromagnetic clutch is fixedly connected with the rotating shaft of the driving gear;
The driving gear is meshed with the driven gear;
And the electronic control unit ECU is respectively connected with a brake pedal displacement sensor, a wheel speed sensor, a gear sensor, an accelerator opening sensor, a Hall sensor, a driving direction angle sensor, an electromagnetic clutch and a motor and is used for controlling the electromagnetic clutch and the motor to work according to the detection data of the emergency brake detection module and the slide slope detection module.
the utility model also provides a slope-sliding prevention method of this heavy-duty car slope-sliding prevention and emergency braking's auxiliary device, contains following step:
step A.1), a gear sensor senses the gear of the automobile gearbox and transmits the gear to an Electronic Control Unit (ECU); the Hall sensor senses the rotation direction of the automobile wheel and transmits the rotation direction to the electronic control unit ECU; the accelerator opening sensor senses the stroke of the automobile accelerator which is stepped on and transmits the stroke to the electronic control unit ECU;
step A.2), if the gear of the automobile is not in reverse gear and the rotation direction of the wheels of the automobile is reverse:
step A.2.1), an electronic control unit ECU sends out a control signal to control an electromagnetic clutch to be engaged and control a motor to work, and power generated by the motor is transmitted through a driving gear, a driven gear and a planetary roller mechanism in sequence to push a push rod to translate so as to brake the heavy-duty automobile;
Step A.2.2), the electronic control unit ECU compares the treading stroke of the accelerator pedal with a preset first displacement threshold value:
step A.2.2.1), if the stepping stroke of the accelerator pedal is larger than a preset first displacement threshold value, the electronic control unit ECU sends out a control signal to control the electromagnetic clutch to separate and control the motor to stop working, the push rod returns to the original position under the action of a return spring of the air brake system of the heavy-duty car, and braking is released.
The utility model also provides an emergency braking method of this heavy-duty car swift current slope and emergency braking's auxiliary device, contains following step:
B.1), sensing the stroke of the automobile brake pedal by a brake pedal displacement sensor, and transmitting the stroke to an Electronic Control Unit (ECU); the wheel speed sensor senses the rotating speed of the automobile wheel and transmits the rotating speed to the electronic control unit ECU;
step B.2), comparing the treaded stroke of the automobile brake pedal with a preset second displacement threshold by the electronic control unit ECU:
step B.2.1), the treading travel of the automobile brake pedal is larger than a preset second displacement threshold value:
Step B.2.1.1), an electronic control unit ECU controls an electromagnetic clutch to be engaged and controls a motor to work, and power generated by the motor is transmitted through a driving gear, a driven gear and a planetary roller mechanism in sequence to push a push rod to translate so as to brake the heavy-duty automobile;
step B.2.1.2), the electronic control unit ECU compares the rotating speed of the automobile wheels with a preset rotating speed threshold value:
And B.2.1.2.1), when the rotating speed of the automobile wheels is less than a preset rotating speed threshold value, the electronic control unit ECU sends out a control signal to control the electromagnetic clutch to separate and control the motor to stop working, the push rod returns to the original position under the action of a return spring of the air brake system of the heavy-duty automobile, and braking is released.
the utility model adopts the above technical scheme to compare with prior art, have following technological effect:
1. compact structure easily arranges: the device can realize the target function by adding fewer elements on the basis of the air braking of the heavy-duty vehicle, and is simple and easy to arrange;
2. Low cost, complete functions: the utility model can realize the heavy vehicle anti-slide slope by using a set of actuating mechanism, and can realize the auxiliary braking during the emergency braking, the cost is low, and the functions are rich;
3. The reliability is high: the utility model adopts a plurality of sensors to accurately judge whether the heavy vehicle needs to prevent the vehicle from sliding down the slope and assist the braking, and has high intelligent degree and reliable work;
4. it is extensive to use, the utility model discloses traditional fuel vehicle and each new energy automobile that can install also can install and realize autonomic braking function in unmanned automobile.
drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic flow chart of a method for preventing slope slipping in the present invention;
fig. 3 is a schematic flow chart of the emergency braking of the present invention.
in the figure, 1-a brake air chamber, 2-a return spring, 3-a push rod, 4-an inner gear ring, 5-a driven gear, 6-a planet wheel, 7-an adjusting arm, 8-a connecting fork, 9-a cam, 10-a sun wheel, 11-a driving gear, 12-an electromagnetic clutch and 13-a motor.
Detailed Description
the technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
as shown in figure 1, the utility model discloses a heavy-duty car prevents swift current slope and emergency braking's auxiliary device, traditional heavy-duty car generally all adopts air brake system, drives the push rod translation through the piston among the brake chamber, and then drives the cam rotation through yoke, adjustment arm, and under the effect of cam, heavy-duty car's brake shoe top brake disc obtains the brake force. After the brake is released, a return spring in the air cylinder drives the push rod to return to the original position.
The utility model comprises an emergency braking detection module, a slope sliding detection module, an electronic control unit ECU and a braking execution mechanism;
the emergency brake detection module comprises a brake pedal displacement sensor and a wheel speed sensor; the brake pedal displacement sensor is used for sensing the treading stroke of the automobile brake pedal and transmitting the treading stroke to the electronic control unit ECU; the wheel speed sensor is arranged on a vehicle wheel and used for sensing the rotating speed of the vehicle wheel and transmitting the rotating speed to the electronic control unit ECU;
the slope sliding detection module comprises a gear sensor, an accelerator opening sensor and a Hall sensor; the gear sensor is used for sensing the gear of the automobile gearbox and transmitting the gear to the electronic control unit ECU; the accelerator opening sensor is used for sensing the stroke of the automobile accelerator which is stepped on and transmitting the stroke to the electronic control unit ECU; the Hall sensors are arranged on the wheels of the automobile and used for sensing the rotation direction of the wheels of the automobile and transmitting the rotation direction to the electronic control unit ECU;
a push rod in the heavy-duty car air braking system is provided with threads;
the brake actuating mechanism comprises a planetary roller mechanism, a driving gear, a driven gear, an electromagnetic clutch and a motor;
the planetary roller mechanism comprises an inner gear ring, a sun gear, a planet carrier and a plurality of planet gears, wherein the inner gear ring, the plurality of planet gears and the sun gear are arranged from outside to inside and are matched with the planet carrier to form a planetary gear train;
the sun gear is an outer gear ring, threads matched with the threads on the push rod are arranged on the inner wall of the sun gear, and the inner wall of the sun gear is in threaded connection with the push rod;
the driven gear is an outer gear ring, and the inner wall of the driven gear is rigidly connected with the outer ring of the inner gear ring;
the output shaft of the motor is fixedly connected with the input shaft of the electromagnetic clutch, and the output shaft of the electromagnetic clutch is fixedly connected with the rotating shaft of the driving gear;
the driving gear is meshed with the driven gear;
and the electronic control unit ECU is respectively connected with a brake pedal displacement sensor, a wheel speed sensor, a gear sensor, an accelerator opening sensor, a Hall sensor, a driving direction angle sensor, an electromagnetic clutch and a motor and is used for controlling the electromagnetic clutch and the motor to work according to the detection data of the emergency brake detection module and the slide slope detection module.
as shown in fig. 2, the utility model also provides a method for preventing heavy-duty car from sliding down a slope and for assisting the emergency braking, comprising the following steps:
Step A.1), a gear sensor senses the gear of the automobile gearbox and transmits the gear to an Electronic Control Unit (ECU); the Hall sensor senses the rotation direction of the automobile wheel and transmits the rotation direction to the electronic control unit ECU; the accelerator opening sensor senses the stroke of the automobile accelerator which is stepped on and transmits the stroke to the electronic control unit ECU;
Step A.2), if the gear of the automobile is not in reverse gear and the rotation direction of the wheels of the automobile is reverse:
Step A.2.1), an electronic control unit ECU sends out a control signal to control an electromagnetic clutch to be engaged and control a motor to work, and power generated by the motor is transmitted through a driving gear, a driven gear and a planetary roller mechanism in sequence to push a push rod to translate so as to brake the heavy-duty automobile;
Step A.2.2), the electronic control unit ECU compares the treading stroke of the accelerator pedal with a preset first displacement threshold value:
step A.2.2.1), if the stepping stroke of the accelerator pedal is larger than a preset first displacement threshold value, the electronic control unit ECU sends out a control signal to control the electromagnetic clutch to separate and control the motor to stop working, the push rod returns to the original position under the action of a return spring of the air brake system of the heavy-duty car, and braking is released.
as shown in fig. 3, the present invention further provides an emergency braking method for the auxiliary device of heavy-duty vehicle for slope sliding prevention and emergency braking, comprising the following steps:
b.1), sensing the stroke of the automobile brake pedal by a brake pedal displacement sensor, and transmitting the stroke to an Electronic Control Unit (ECU); the wheel speed sensor senses the rotating speed of the automobile wheel and transmits the rotating speed to the electronic control unit ECU;
Step B.2), comparing the treaded stroke of the automobile brake pedal with a preset second displacement threshold by the electronic control unit ECU:
step B.2.1), the treading travel of the automobile brake pedal is larger than a preset second displacement threshold value:
step B.2.1.1), an electronic control unit ECU controls an electromagnetic clutch to be engaged and controls a motor to work, and power generated by the motor is transmitted through a driving gear, a driven gear and a planetary roller mechanism in sequence to push a push rod to translate so as to brake the heavy-duty automobile;
step B.2.1.2), the electronic control unit ECU compares the rotating speed of the automobile wheels with a preset rotating speed threshold value:
and B.2.1.2.1), when the rotating speed of the automobile wheels is less than a preset rotating speed threshold value, the electronic control unit ECU sends out a control signal to control the electromagnetic clutch to separate and control the motor to stop working, the push rod returns to the original position under the action of a return spring of the air brake system of the heavy-duty automobile, and braking is released.
it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
the above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. An auxiliary device for preventing a heavy truck from sliding down a slope and performing emergency braking is characterized by comprising an emergency braking detection module, a slope sliding detection module, an Electronic Control Unit (ECU) and a braking execution mechanism;
The emergency brake detection module comprises a brake pedal displacement sensor and a wheel speed sensor; the brake pedal displacement sensor is used for sensing the treading stroke of the automobile brake pedal and transmitting the treading stroke to the electronic control unit ECU; the wheel speed sensor is arranged on a vehicle wheel and used for sensing the rotating speed of the vehicle wheel and transmitting the rotating speed to the electronic control unit ECU;
the slope sliding detection module comprises a gear sensor, an accelerator opening sensor and a Hall sensor; the gear sensor is used for sensing the gear of the automobile gearbox and transmitting the gear to the electronic control unit ECU; the accelerator opening sensor is used for sensing the stroke of the automobile accelerator which is stepped on and transmitting the stroke to the electronic control unit ECU; the Hall sensors are arranged on the wheels of the automobile and used for sensing the rotation direction of the wheels of the automobile and transmitting the rotation direction to the electronic control unit ECU;
A push rod in the heavy-duty car air braking system is provided with threads;
the brake actuating mechanism comprises a planetary roller mechanism, a driving gear, a driven gear, an electromagnetic clutch and a motor;
the planetary roller mechanism comprises an inner gear ring, a sun gear, a planet carrier and a plurality of planet gears, wherein the inner gear ring, the plurality of planet gears and the sun gear are arranged from outside to inside and are matched with the planet carrier to form a planetary gear train;
The sun gear is an outer gear ring, threads matched with the threads on the push rod are arranged on the inner wall of the sun gear, and the inner wall of the sun gear is in threaded connection with the push rod;
the driven gear is an outer gear ring, and the inner wall of the driven gear is rigidly connected with the outer wall of the inner gear ring;
the output shaft of the motor is fixedly connected with the input shaft of the electromagnetic clutch, and the output shaft of the electromagnetic clutch is fixedly connected with the rotating shaft of the driving gear;
the driving gear is meshed with the driven gear;
and the electronic control unit ECU is respectively connected with a brake pedal displacement sensor, a wheel speed sensor, a gear sensor, an accelerator opening sensor, a Hall sensor, an electromagnetic clutch and a motor and is used for controlling the electromagnetic clutch and the motor to work according to detection data of the emergency braking detection module and the slope sliding detection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920011909.5U CN209739046U (en) | 2019-01-04 | 2019-01-04 | Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920011909.5U CN209739046U (en) | 2019-01-04 | 2019-01-04 | Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209739046U true CN209739046U (en) | 2019-12-06 |
Family
ID=68704809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920011909.5U Active CN209739046U (en) | 2019-01-04 | 2019-01-04 | Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209739046U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109677378A (en) * | 2019-01-04 | 2019-04-26 | 南京航空航天大学 | A kind of anti-auxiliary device and method slipped by slope with emergency braking of heavy-duty car |
-
2019
- 2019-01-04 CN CN201920011909.5U patent/CN209739046U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109677378A (en) * | 2019-01-04 | 2019-04-26 | 南京航空航天大学 | A kind of anti-auxiliary device and method slipped by slope with emergency braking of heavy-duty car |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6676561B2 (en) | Torque transfer system for a motor vehicle | |
| CN102167032B (en) | Upslope auxiliary control method of deep hybrid-electric vehicle | |
| US9233666B2 (en) | Shift-by-wire vehicle and method to verify securement | |
| CN200942768Y (en) | Vehicle parking brake system | |
| CN102133864B (en) | Accelerated pedal with self-locking and driven resetting functions | |
| CN101823481B (en) | Control method Electronic parking brake system | |
| CN103448544B (en) | A kind of Vehicle auxiliary drive method | |
| US9035591B2 (en) | Control method of electronic parking brake system | |
| CN214734194U (en) | Forklift traveling system | |
| US20130144499A1 (en) | Method for controlling a starting aid of a motor vehicle | |
| KR102383434B1 (en) | Apparatus for controlling hold of awd vehicle and method thereof | |
| GB2329442A (en) | Timed controlled engaged state of an automatic clutch | |
| CN206734284U (en) | A kind of brakes of electric car | |
| CN209739046U (en) | Auxiliary device for preventing heavy-duty car from sliding down slope and performing emergency braking | |
| CN104590252B (en) | A kind of rollback control method based on stabilizing control system | |
| CN109677378A (en) | A kind of anti-auxiliary device and method slipped by slope with emergency braking of heavy-duty car | |
| CN108860119B (en) | Electronic hand brake for motor vehicle and parking brake control method thereof | |
| CN114537396A (en) | Self-adaptive control method and system for ramp auxiliary function of automatic-transmission commercial vehicle | |
| CN204573076U (en) | A kind of planetary gear type parking and braking mechanism | |
| US7201703B2 (en) | Gear type speed change unit control device, control method, and automobile | |
| CN102133890B (en) | Slope start-stop auxiliary safety system of motor vehicle | |
| CN101780796A (en) | Method and device for controlling motor vehicle brake | |
| CN103407376A (en) | Electrically-driven automobile brake energy recovering device | |
| CN101643064B (en) | Anti-running device and automobile provided with device | |
| CN204140854U (en) | A kind of car ramp start assisting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |