CN115574027A - Braking safety protection system and method - Google Patents
Braking safety protection system and method Download PDFInfo
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- CN115574027A CN115574027A CN202211148492.XA CN202211148492A CN115574027A CN 115574027 A CN115574027 A CN 115574027A CN 202211148492 A CN202211148492 A CN 202211148492A CN 115574027 A CN115574027 A CN 115574027A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 127
- 239000000725 suspension Substances 0.000 claims abstract description 11
- 230000001419 dependent effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 230000002269 spontaneous effect Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/001—Temperature
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Abstract
The invention particularly relates to a braking safety protection system and a braking safety protection method. The braking safety protection system provided by the invention comprises a direct-current power supply, an air compressor relay, a master electromagnetic valve, a left front cooling device and a right front cooling device; the direct current power supply supplies power to the air compressor and the air compressor relay respectively, the air compressor relay controls the air compressor to work and do not work, and air in the air compressor enters the left front cooling device and the right front cooling device through the electromagnetic main valve. The left front cooling device comprises a left front cooling valve and a left front cooling exhaust hole; the left front cooling valve is integrated in the electromagnetic main valve and is connected to the left front cooling exhaust hole through an air pressure pipeline. By utilizing the existing air suspension system, when the temperature is sensed to be close to the threshold value of the ignition point in advance, the air compressor can be automatically started to blow away friction plate powder, and wind power cooling is carried out on the brake disc and the friction plate to prevent spontaneous combustion.
Description
Technical Field
The invention relates to the field of automobile brake safety protection, in particular to a brake safety protection system and a brake safety protection method.
Background
With the increasing travel of people, more and more vehicles can run on a multi-turn road in mountains. The road has many curves, a driver is required to frequently brake, if the material composition of a brake disc and a friction plate is controlled unstably during manufacturing, the vehicle has large mass, parts around the wheel are densely arranged, the space is narrow, the friction plate powder cannot be blown away in time, when the temperature reaches the ignition point of the powder, the combustion phenomenon is easy to generate, and great potential safety hazards exist. The currently adopted treatment method is as follows: a mathematical model is formulated to estimate the temperature of the brake disc, when the temperature of the brake disc rises, the brake system is considered to generate a heat fading phenomenon, and active pressurization is carried out through an ESC (electronic stability control system), so that the braking efficiency is improved. However, this method can only improve the braking efficiency, and cannot solve the problem of spontaneous combustion caused by the accumulation of friction plate powder at high temperature due to frequent braking.
The prior art carries out temperature monitoring and cooling to the brake disc mostly, does not have the technique of cooling to the friction disc specially. The Chinese invention patent 'an automobile brake system gas-liquid two-phase cooling device' (CN 101544226B) discloses an automobile brake system gas-liquid two-phase cooling device which comprises a control unit, a liquid cooling device for cooling a brake disc of an automobile brake in a mode of spraying a refrigerant liquid, a gas cooling device for cooling the brake disc in a blowing mode and automatically starting to blow the refrigerant liquid reserved on the brake disc after the liquid cooling device works, an alarm unit for reminding a driver to brake and stop so as to cool the brake disc, and a first temperature detector for detecting the temperature of the brake disc in real time; the temperature detector is connected with the control unit; the liquid cooling device and the gas cooling device are both installed on the automobile body of the automobile. The brake disc cooling device is reasonable in design, convenient to install and maintain and good in using effect, and can effectively solve the problem of cooling of the brake disc in the long-time braking process of an automobile. But not for cooling of the friction plates.
Disclosure of Invention
In order to solve the problem of hidden danger of spontaneous combustion of friction plate powder accumulation, the invention designs a protection method for braking safety.
The braking safety protection system provided by the invention comprises a direct-current power supply, an air compressor relay, a master electromagnetic valve, a left front cooling device and a right front cooling device; the direct current power supply supplies power to the air compressor and the air compressor relay respectively, the air compressor relay controls the air compressor to work and do not work, and air in the air compressor enters the left front cooling device and the right front cooling device through the electromagnetic main valve.
Further, the left front cooling device comprises a left front cooling valve and a left front cooling exhaust hole; the left front cooling valve is integrated in the electromagnetic main valve and is connected to the left front cooling exhaust hole through an air pressure pipeline.
Furthermore, the left front cooling valve is a one-way valve, and air exhausted from the left front cooling exhaust port blows to the left front friction plate.
Further, the right front cooling device includes a right front cooling valve and a right front cooling exhaust vent; the right front cooling valve is integrated in the solenoid header valve and is connected to a right front cooling exhaust vent through an air pressure pipeline.
Furthermore, the right front cooling valve is a check valve, and air exhausted from the right front cooling exhaust port is blown to the right front friction plate.
Further, the system is integrated in a front brake friction pair temperature control module of an automobile brake system controller, and the automobile brake system controller is electrically connected with an air compressor relay, a left front cooling valve and a right front cooling valve.
The invention provides a control method of the brake safety protection system, which comprises the following steps:
s1, the lower limit value of the temperature of the front brake friction pair is the environment temperature T e If the corresponding front brake friction pair current temperature T di (k) Over the ignition threshold T f Then the braking safety protection system is started, the relay of the air compressor is closed, the left/right front cooling valve is opened, and the air compressor blows air from the left/right frontCooling air outlets are blown to the left/right front friction plates;
s2, calculating the active cooling energy W of the left/right front brake friction pair ci ：
W ci ＝(T di (k)-T e )Q c C e ρ e Δ t, i =1,2; wherein, T di (k) The current temperature of the front brake friction pair corresponds to a left front brake friction pair when i =1, and corresponds to a right front brake friction pair when i = 2; q c Displacement of air from the cooling valve for the air compressor, C e Is the specific heat of air, ρ e Is the air density, Δ t is the sampling time interval;
s3, calculating the active cooling temperature reduction amount of the front brake friction pair: delta T ci ：
Wherein, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
s4, determining the threshold value T of the ignition point f ：
When Δ T ai ＝ΔT bi +ΔT ci Where, Δ T ai Increase in friction temperature, Δ T, of front brake friction pairs bi The passive cooling temperature reduction amount of the front brake friction pair is obtained; the increase amount and the decrease amount of the friction temperature of the front brake friction pair are balanced, and the temperature of the front brake friction pair is not increased any more at the moment, namely the temperature T of the front brake friction pair at the moment di (k) Comprises the following steps:
i =1,2; wherein, P i Is the wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To the wheel speed, R i To brake effective radius, C vi For a velocity-dependent cooling coefficient, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc; taking a threshold value T of an ignition point f The temperature of the front brake friction pair is lower than the temperature of the front brake friction pair at the moment, namely: t is f ＝(0.8～0.9)×T di (k)，i＝1,2；
S5Current brake friction pair temperature T di (k) Reduced to ambient temperature T e 1.1-1.2 times, the brake safety protection system is closed, i.e. if T is d1 (k)<(1.1～1.2)T e Then the front left cooling device is turned off, if T d2 (k)<(1.1～1.2)T e And the right front cooling device is turned off.
Further, the step of calculating the temperature of the front brake friction pair comprises the following steps:
step one, calculating input energy W of a front brake friction pair ai ：W ai ＝2P i B i μ i ω wi R i Δ t, i =1,2; wherein, P i Is the wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To the wheel speed, R i Delta t is the effective braking radius, delta t is the sampling time interval;
step two, calculating the friction temperature increment delta T of the front brake friction pair ai ：
i =1,2; wherein, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
step three, calculating the passive cooling energy W of the front brake friction pair bi ：W bi ＝(T di (k)-T e )C vi C d m d Δt，i＝1,2；
Wherein, T di (k) Is the current temperature of the front brake friction pair, T e Is ambient temperature, C vi Is the velocity dependent cooling coefficient;
step four, calculating the passive cooling temperature reduction delta T of the front brake friction pair bi ：
i＝1,2；
Step five, calculating the temperature T of the braking friction pair before the next moment di (k+1)：
T di (k+1)＝T di (k)+ΔT ai -ΔT bi I =1,2; and is cyclically reciprocated in this way.
Further, when the air suspension height adjusting state signal is adjusting, the brake safety protection system is not started, when the air suspension height adjusting state signal is adjusting, the brake safety protection system is started conditionally, and when the vehicle is flameout, the left front cooling valve and the right front cooling valve are closed.
Further, when the vehicle driving distance exceeds 50km from the ignition, no matter whether the temperature of the front brake friction pair exceeds the ignition point threshold value or not, when the air suspension height adjusting state signal shows that the adjustment is finished, the one-time brake safety protection system is started for 20s.
The invention has the beneficial effects that: when the temperature is close to the ignition point threshold value, the air compressor can be automatically started, the brake disc and the friction plate are cooled by wind power, spontaneous combustion is prevented, and the safety coefficient of driving is improved; the invention adds a left front cooling device and a right front cooling device on the basis of the structure of the existing air suspension system, and has simple structure and easy realization. The invention can also blow away friction plate powder periodically due to the driving mileage, thereby preventing potential safety hazard caused by friction plate powder accumulation.
Drawings
Fig. 1 is a block diagram of a brake safety protection system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the braking safety protection system provided by the invention comprises a direct current power supply, an air compressor relay, a solenoid main valve, a left front cooling device and a right front cooling device; the direct current power supply supplies power to the air compressor and the air compressor relay respectively, the air compressor relay controls the air compressor to work and do not work, and air in the air compressor enters the left front cooling device and the right front cooling device through the electromagnetic main valve. The left front cooling device comprises a left front cooling valve and a left front cooling exhaust hole; the left front cooling valve is integrated in the electromagnetic main valve and is connected to the left front cooling exhaust hole through an air pressure pipeline. The left front cooling valve is a one-way valve, and air exhausted from the left front cooling exhaust port blows to the left front friction plate.
The right front cooling device comprises a right front cooling valve and a right front cooling exhaust hole; the right front cooling valve is integrated in the solenoid header valve and is connected to a right front cooling exhaust vent through an air pressure pipeline. The right front cooling valve is a check valve, and air exhausted from the right front cooling exhaust port is blown to the right front friction plate.
The system is integrated in a front brake friction pair temperature control module of an automobile brake system controller, and the automobile brake system controller is electrically connected with an air compressor relay, a left front cooling valve and a right front cooling valve.
The invention also provides a control method of the brake safety protection system, which comprises the following steps that i =1 corresponds to the left front brake friction pair, and i =2 corresponds to the right front brake friction pair:
s1, the lower limit value of the temperature of the front brake friction pair is the environment temperature T e If the corresponding front brake friction pair current temperature T di (k) Over the ignition threshold T f If the brake safety protection system is started, the air compressor relay is closed, the left/right front cooling valve is opened, and the air compressor blows air to the left/right front friction plates from the left/right front cooling exhaust port;
s2, calculating the active cooling energy W of the left/right front brake friction pair ci ：
W ci ＝(T di (k)-T e )Q c C e ρ e Δ T (i =1,2), where T di (k) For the current temperature of the front brake friction pair, Q c Displacement of air from the cooling valve for the air compressor, C e Is the specific heat of air, ρ e Is the air density, Δ t is the sampling time interval;
s3, calculating the active cooling temperature reduction delta T of the front brake friction pair ci ：
Wherein, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
s4, determining the ignition point threshold value T f : when Δ T is measured ai ＝ΔT bi +ΔT ci Where, Δ T ai Increase in friction temperature, Δ T, of front brake friction pair bi The passive cooling temperature reduction amount of the front brake friction pair is obtained; the increase amount and the decrease amount of the friction temperature of the front brake friction pair are balanced, and the temperature of the front brake friction pair is not increased any more at the moment, namely the temperature T of the front brake friction pair at the moment di (k) Comprises the following steps:
wherein, P i As wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To wheel speed, R i To brake effective radius, C vi For a velocity-dependent cooling coefficient, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc; taking a threshold value T of an ignition point f The temperature of the front brake friction pair is lower than the temperature of the front brake friction pair at the moment, namely: t is f ＝(0.8～0.9)×T di (k)(i＝1,2)；
S5, current brake friction pair temperature T di (k) Reduced to ambient temperature T e 1.1-1.2 times, the brake safety protection system is closed, i.e. if T is d1 (k)<(1.1～1.2)T e Then the front left cooling device is turned off, if T d2 (k)<(1.1～1.2)T e And the right front cooling device is turned off.
The method for calculating the temperature of the front brake friction pair is as follows, wherein when i =1, the temperature corresponds to the left front brake friction pair, and when i =2, the temperature corresponds to the right front brake friction pair:
step one, calculating input energy W of a front brake friction pair ai ：W ai ＝2P i B i μ i ω wi R i Δ t (i =1,2), where P i Is the wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To the wheel speed, R i The effective radius of braking is, and delta t is a sampling time interval;
step two, calculating the friction temperature increment delta T of the front brake friction pair ai ：
Wherein, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
step three, calculating the passive cooling energy W of the front brake friction pair bi ：
W bi ＝(T di (k)-T e )C vi C d m d Δ T (i =1,2), where T di (k) For front braking friction pairCurrent temperature, T e Is ambient temperature, C vi Is the velocity dependent cooling coefficient;
step four, calculating the passive cooling temperature reduction delta T of the front brake friction pair bi ：
Step five, calculating the temperature T of the braking friction pair before the next moment di (k+1)：
T di (k+1)＝T di (k)+ΔT ai -ΔT bi (i =1,2) and is cycled back and forth in this cycle.
The brake safety protection system interacts with other signals:
when the air suspension height adjusting state signal is adjusting, the left/right front cooling valves are kept closed, the braking safety protection system cannot be started, only when the air suspension height adjusting state signal is adjusting, the left/right front cooling valves are conditionally opened, and the braking safety protection system is conditionally started.
When the vehicle is turned off, the left/right front cooling valves need to be immediately closed if they are in an open state.
And starting the one-time braking safety protection system for 20s after the ignition is started and the running mileage of the vehicle exceeds 50km, and starting the one-time braking safety protection system for timing to blow away residual friction plate powder as long as the air suspension height adjusting state signal is adjusted whether the temperature of the front braking friction pair exceeds the ignition point threshold value or not.
Claims (10)
1. A braking safety protection system is characterized by comprising a direct current power supply, an air compressor relay, a master electromagnetic valve, a left front cooling device and a right front cooling device; the direct current power supply supplies power to the air compressor and the air compressor relay respectively, the air compressor relay controls the air compressor to work and not work, and air in the air compressor enters the left front cooling device and the right front cooling device through the electromagnetic main valve.
2. The brake safety system of claim 1, wherein the front left cooling device comprises a front left cooling valve and a front left cooling vent; the left front cooling valve is integrated in the electromagnetic main valve and is connected to the left front cooling exhaust hole through an air pressure pipeline.
3. The brake safety system according to claim 2, wherein the left front cooling valve is a check valve, and air exhausted from the left front cooling exhaust port blows to the left front friction plate.
4. The brake safety system of claim 3, wherein the right front cooling device includes a right front cooling valve and a right front cooling exhaust vent; the right front cooling valve is integrated in the solenoid header valve and is connected to a right front cooling exhaust vent through an air pressure pipeline.
5. The brake safety system of claim 4, wherein the right front cooling valve is a check valve and air exhausted from the right front cooling exhaust port is blown toward the right front friction plate.
6. The brake safety protection system of claim 5, integrated into a front brake friction pair temperature control module of a vehicle brake system controller, the vehicle brake system controller electrically connected to the air compressor relay, the left front cooling valve, and the right front cooling valve.
7. A control method of a brake safety system according to any one of claims 1 to 6, characterized in that the control method comprises:
s1, the lower limit value of the temperature of the front brake friction pair is the environment temperature T e If the corresponding front brake friction pair current temperature T di (k) Over the ignition threshold T f Then the braking safety protection system is started, the relay of the air compressor is closed, the left/right front cooling valves are opened, and the air compressor will emptyAir is blown to the left/right front friction plates from the left/right front cooling air outlets;
s2, calculating the active cooling energy W of the left/right front brake friction pair ci ：
W ci ＝(T di (k)-T e )Q c C e ρ e Δ t, i =1,2; wherein, T di (k) The current temperature of the front brake friction pair corresponds to a left front brake friction pair when i =1, and corresponds to a right front brake friction pair when i = 2; q c Displacement of air from the cooling valve for the air compressor, C e Is the specific heat of air, ρ e Is the air density, Δ t is the sampling time interval;
s3, calculating the active cooling temperature reduction amount of the front brake friction pair: delta T ci ：
Wherein, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
s4, determining the ignition point threshold value T f ：
When Δ T ai ＝ΔT bi +ΔT ci Where, Δ T ai Increase in friction temperature, Δ T, of front brake friction pair bi The passive cooling temperature reduction amount of the front brake friction pair is obtained; the increase amount and the decrease amount of the friction temperature of the front brake friction pair are balanced, and the temperature of the front brake friction pair is not increased any more at the moment, namely the temperature T of the front brake friction pair at the moment di (k) Comprises the following steps:
wherein, P i Is the wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To wheel speed, R i To brake effective radius, C vi For a velocity-dependent cooling coefficient, C d Is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc; taking a threshold value T of an ignition point f The temperature of the front brake friction pair is lower than the temperature of the front brake friction pair at the moment, namely: t is f ＝(0.8～0.9)×T di (k)，i＝1,2；
S5, current brake friction pair temperature T di (k) Reduced to ambient temperature T e 1.1-1.2 times of the brake pressure, the brake safety protection system is closed, namely if T d1 (k)<(1.1～1.2)T e Then the front left cooling device is turned off, if T d2 (k)<(1.1～1.2)T e And the right front cooling device is turned off.
8. The control method according to claim 7, wherein the calculating step of the front brake friction pair temperature includes:
step one, calculating input energy W of a front brake friction pair ai ：W ai ＝2P i B i μ i ω wi R i Δ t, i =1,2; wherein, P i Is the wheel cylinder pressure, B i Is the cross-sectional area of the wheel cylinder, mu i Is the friction coefficient of the friction plate, omega wi To wheel speed, R i The effective radius of braking is, and delta t is a sampling time interval;
step two, calculating the friction temperature increment delta T of the front brake friction pair ai ：
Wherein the content of the first and second substances,
C d is the thermodynamic coefficient of the front brake disk, m d The mass of the front brake disc;
step three, calculating the passive cooling energy W of the front brake friction pair bi ：W bi ＝(T di (k)-T e )C vi C d m d Δt，i＝1,2；
Wherein, T di (k) Is the current temperature of the front brake friction pair, T e Is ambient temperature, C vi Is the velocity dependent cooling coefficient;
step four, calculating the passive cooling temperature reduction delta T of the front brake friction pair bi ：
Step five, calculating the brake friction before the next momentTemperature T of the wiping pair di (k+1)：T di (k+1)＝T di (k)+ΔT ai -ΔT bi I =1,2; and is cyclically reciprocated in this way.
9. The control method of claim 7, wherein the brake safety system is not activated when the air suspension height adjustment status signal is adjustment, the brake safety system is conditionally activated when the air suspension height adjustment status signal is adjustment completed, and the left and right front cooling valves are closed when the vehicle is shut down.
10. The control method of claim 7, wherein the one-time brake safety protection system is activated for a duration of 20s when the air suspension height adjustment status signal indicates that adjustment is complete after the vehicle mileage exceeds 50km from ignition regardless of whether the front brake friction pair temperature exceeds the ignition threshold.
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| CN108407790A (en) * | 2018-04-28 | 2018-08-17 | 瑞立集团瑞安汽车零部件有限公司 | The commercial automobile-used integrated form air braking system of new energy |
| CN108422989A (en) * | 2018-04-28 | 2018-08-21 | 瑞立集团瑞安汽车零部件有限公司 | The commercial automobile-used air braking system of new energy |
| CN209410036U (en) * | 2018-04-28 | 2019-09-20 | 瑞立集团瑞安汽车零部件有限公司 | The commercial automobile-used integrated form air braking system of new energy and its vehicle |
| CN209410032U (en) * | 2018-04-28 | 2019-09-20 | 瑞立集团瑞安汽车零部件有限公司 | The commercial automobile-used air braking system of new energy and its vehicle |
| CN114537352A (en) * | 2022-01-14 | 2022-05-27 | 南京金龙客车制造有限公司 | Integrated cooling high-reliability brake-by-wire system and method |
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