Brake control device and method
阅读说明:本技术 一种制动控制装置和方法 (Brake control device and method ) 是由 谢军威 蒋廉华 邓宗群 王书静 吴易航 于 2019-11-11 设计创作,主要内容包括:本发明提供一种制动控制装置和方法,其中,制动控制单元用于根据接收的制动请求,生成第一控制信号和第二控制信号;制动请求包括空气制动力和用于进行动力制动的电制动力。制动控制单元根据空气制动输出单元输出的压力差值,调整作用于第二等效单元的第二控制信号,使压力差值等效空气制动力并输出至制动缸进行空气制动。此空气制动与轨道车辆的动力制动混合共同作用,构成了轨道车辆所需的制动力。本发明通过制动控制单元实现了同时进行空气制动和电制动的制动控制方式,相比于现有技术中只使用一种制动方式进行制动,在相同的制动力需求下,能减少制动部件损耗,更好的利用动力制动使轨道车辆使用更加节能清洁环保。(The invention provides a brake control device and a method, wherein a brake control unit is used for generating a first control signal and a second control signal according to a received brake request; the braking request includes an air braking force and an electric braking force for performing dynamic braking. And the brake control unit adjusts a second control signal acting on the second equivalent unit according to the pressure difference output by the air brake output unit, so that the pressure difference is equivalent to an air braking force and is output to the brake cylinder for air braking. The air brake and the power brake of the rail vehicle are mixed and act together to form the braking force required by the rail vehicle. According to the invention, a brake control mode of simultaneously carrying out air braking and electric braking is realized through the brake control unit, and compared with the prior art that only one brake mode is used for braking, the brake control unit can reduce the loss of brake parts under the same braking force requirement, and can better utilize power braking to enable the railway vehicle to be more energy-saving, cleaner and more environment-friendly.)
1. A brake control apparatus, characterized by comprising:
the brake control unit is used for generating a first control signal and a second control signal according to the received brake request; wherein the braking request comprises an electric braking force and an air braking force, and the electric braking force is used for performing power braking;
the first equivalent unit comprises a first adjusting component, a second adjusting component and a first pressure sensor, and the first control signal acts on the first adjusting component and the second adjusting component to enable the first equivalent unit to output a first pressure value;
the second equivalent unit comprises a third adjusting part and a fourth adjusting part, and the second control signal acts on the third adjusting part and the fourth adjusting part to enable the second equivalent unit to output a second pressure value;
the air brake output unit comprises an execution component and a second pressure sensor, wherein the execution component is used for outputting a pressure difference value between the second pressure value and the first pressure value to a brake cylinder so as to enable the brake cylinder to carry out air brake;
the brake control unit is further configured to adjust a first control signal acting on the first adjusting component and the second adjusting component according to a first pressure value acquired by the first pressure sensor, so that the first pressure value is equivalent to the electric braking force; and the air brake system is also used for adjusting the second control signals acting on the third adjusting component and the fourth adjusting component according to the pressure difference value acquired by the second pressure sensor so that the pressure difference value is equivalent to the air brake force.
2. The brake control device of claim 1, wherein the first equivalent unit further comprises a first reservoir, the first reservoir and the first pressure sensor being connected at an output of the first equivalent unit, the output being connected to an input of the air brake output unit; the first air reservoir is used for slowing down the change of the first pressure value;
the first adjusting component is arranged on a connecting passage between the output end and the main air cylinder, and the second adjusting component is arranged on a connecting passage between the output end and the first exhaust port, so that the first pressure value output by the output end is adjusted through the first adjusting component and the second adjusting component.
3. The brake control device of claim 1, wherein the second equivalent unit further comprises a second reservoir connected to an output of the second equivalent unit, the output being connected to an input of the air brake output unit; the second air cylinder is used for slowing down the change of the second pressure value;
the third adjusting component is arranged on a connecting passage between the output end and the main air cylinder; the fourth adjusting member is disposed on a connection path between the output terminal and the second exhaust port to adjust a second pressure value output from the output terminal by the third adjusting member and the fourth adjusting member.
4. The brake control apparatus according to claim 1, wherein the brake control unit is further configured to cut off a connection path between the air brake output unit and the brake cylinder when a sum of the electric braking force and the air braking force is smaller than a preset value.
5. The brake control apparatus according to claim 4, characterized in that the air brake output unit further includes a switching member and a fifth regulating member; the switching member is provided on a connection passage between the air brake output unit and the brake cylinder; the fifth adjusting member is provided on a connection passage between the switching member and the master reservoir;
and a brake control unit for opening the fifth adjustment member to open a connection path between the master reservoir and the switching member, so that the switching member operates to cut off the connection path between the air brake output unit and the brake cylinder.
6. The brake control apparatus according to claim 1, wherein the air brake output unit further includes a cut-off valve provided on a connection path between the air brake output unit and the brake cylinder for cutting off the connection path between the air brake output unit and the brake cylinder upon receiving a service signal.
7. A brake control method characterized by a brake control unit applied to the brake control apparatus according to any one of claims 1 to 6, comprising:
generating a first control signal and a second control signal according to the received braking request; the first control signal acts on a first adjusting part of a first equivalent unit and a second adjusting part of the first equivalent unit in the brake control device to enable the first equivalent unit to output a first pressure value; the second control signal acts on a third adjusting part of a second equivalent unit and a fourth adjusting part of the second equivalent unit in the brake control device, so that the second equivalent unit outputs a second pressure value; the braking request comprises an electric braking force and an air braking force, and the electric braking force is used for performing power braking;
adjusting the first control signal according to a first pressure value acquired by a first pressure sensor of the first equivalent unit, so that the first pressure value is equivalent to the electric braking force;
according to a pressure difference value output by an air brake output unit and collected by a second pressure sensor of the air brake output unit in the brake control device, adjusting the second control signal to enable the pressure difference value to be equivalent to the air brake force, and outputting the pressure difference value to a brake cylinder to enable the brake cylinder to perform air brake; wherein the pressure difference value is a pressure difference value between the second pressure value and the first pressure value output by an execution component of the air brake output unit.
8. The method of claim 7, further comprising:
and when the sum of the electric braking force and the air braking force is smaller than a preset value, cutting off a connecting passage between the air brake output unit and the brake cylinder.
9. The method of claim 8, wherein cutting off the connection between the air brake output unit and the brake cylinder comprises:
opening a fifth adjusting member of the air brake output unit to open a connection passage between a master cylinder and a switching member of the air brake output unit, so that the switching member operates to cut off the connection passage between the air brake output unit and the brake cylinder; wherein the switching member is provided on a connection passage between the air brake output unit and the brake cylinder; the fifth adjusting member is provided on a connection path between the switching member and the master reservoir.
10. The method of claim 7, further comprising:
and controlling a cut-off valve to cut off a connection path between the air brake output unit and the brake cylinder when the service signal is received, wherein the cut-off valve is provided on the connection path between the air brake output unit and the brake cylinder.
Technical Field
The invention relates to the technical field of locomotives, urban rail transit vehicles or rail electric engineering vehicles, in particular to a brake control device and a brake control method.
Background
Braking the vehicle means limiting or reducing the running speed of the vehicle or stopping the vehicle by a retarding action generated by a related operation. The braking mode of the vehicle can adopt air braking or power braking and the like.
The air brake uses compressed air as power, and brakes by controlling the friction force generated by the brake shoes and the wheels, which is also called friction brake. The air brake can generate large brake force to meet the large-scale braking requirement of the vehicle, but the compressed air used for air brake needs to consume large energy, the friction brake can generate large noise, the brake part can be abraded during friction, and the larger the required brake force is, the larger the energy consumption, the noise and the generated abrasion are.
The dynamic braking is changed into a generator by reversing the traction driving motor, and excitation resistance is generated for braking. Because resistance is generated by excitation, brake parts cannot be abraded in the dynamic braking process, but the generated braking force is small, and all braking requirements of a vehicle cannot be met.
Although there are two brake control methods, air brake and dynamic brake, the brake control of the vehicle can only select one brake control method from the air brake and the dynamic brake.
Disclosure of Invention
In view of this, embodiments of the present invention provide a brake control apparatus and method for a vehicle, which solve the problem that power braking and air braking cannot be performed simultaneously.
In one aspect, an embodiment of the present invention provides a brake control apparatus, including:
the brake control unit is used for generating a first control signal and a second control signal according to the received brake request; wherein the braking request comprises an electric braking force and an air braking force, and the electric braking force is used for performing power braking;
the first equivalent unit comprises a first adjusting component, a second adjusting component and a first pressure sensor, and the first control signal acts on the first adjusting component and the second adjusting component to enable the first equivalent unit to output a first pressure value;
the second equivalent unit comprises a third adjusting part and a fourth adjusting part, and the second control signal acts on the third adjusting part and the fourth adjusting part to enable the second equivalent unit to output a second pressure value;
the air brake output unit comprises an execution component and a second pressure sensor, wherein the execution component is used for outputting a pressure difference value between the second pressure value and the first pressure value to a brake cylinder so as to enable the brake cylinder to carry out air brake;
the brake control unit is further configured to adjust a first control signal acting on the first adjusting component and the second adjusting component according to a first pressure value acquired by the first pressure sensor, so that the first pressure value is equivalent to the electric braking force; and the air brake system is also used for adjusting the second control signals acting on the third adjusting component and the fourth adjusting component according to the pressure difference value acquired by the second pressure sensor so that the pressure difference value is equivalent to the air brake force.
Further, the first equivalent unit further comprises a first air cylinder, the first air cylinder and the first pressure sensor are connected to an output end of the first equivalent unit, and the output end is connected to an input end of the air brake output unit; the first air reservoir is used for slowing down the change of the first pressure value;
the first adjusting component is arranged on a connecting passage between the output end and the main air cylinder, and the second adjusting component is arranged on a connecting passage between the output end and the first exhaust port, so that the first pressure value output by the output end is adjusted through the first adjusting component and the second adjusting component.
Further, the second equivalent unit further comprises a second air cylinder, the second air cylinder is connected to the output end of the second equivalent unit, and the output end is connected to the input end of the air brake output unit; the second air cylinder is used for slowing down the change of the second pressure value;
the third adjusting component is arranged on a connecting passage between the output end and the main air cylinder; the fourth adjusting member is disposed on a connection path between the output terminal and the second exhaust port to adjust a second pressure value output from the output terminal by the third adjusting member and the fourth adjusting member.
Further, the brake control unit is further configured to cut off a connection path between the air brake output unit and the brake cylinder when the sum of the electric braking force and the air braking force is smaller than a preset value.
Further, the air brake output unit further includes a switching part and a fifth adjusting part; the switching member is provided on a connection passage between the air brake output unit and the brake cylinder; the fifth adjusting member is provided on a connection passage between the switching member and the master reservoir;
and a brake control unit for opening the fifth adjustment member to open a connection path between the master reservoir and the switching member, so that the switching member operates to cut off the connection path between the air brake output unit and the brake cylinder.
Further, the air brake output unit further comprises a stop valve, and the stop valve is arranged on a connecting passage between the air brake output unit and the brake cylinder and used for cutting off the connecting passage between the air brake output unit and the brake cylinder when receiving an overhaul signal.
In another aspect, an embodiment of the present invention provides a brake control method applied to a brake control unit in the above brake control apparatus, including:
generating a first control signal and a second control signal according to the received braking request; the first control signal acts on a first adjusting part of a first equivalent unit and a second adjusting part of the first equivalent unit in the brake control device to enable the first equivalent unit to output a first pressure value; the second control signal acts on a third adjusting part of a second equivalent unit and a fourth adjusting part of the second equivalent unit in the brake control device, so that the second equivalent unit outputs a second pressure value; the braking request comprises an electric braking force and an air braking force, and the electric braking force is used for performing power braking;
adjusting the first control signal according to a first pressure value acquired by a first pressure sensor of the first equivalent unit, so that the first pressure value is equivalent to the electric braking force;
according to a pressure difference value output by an air brake output unit and collected by a second pressure sensor of the air brake output unit in the brake control device, adjusting the second control signal to enable the pressure difference value to be equivalent to the air brake force, and outputting the pressure difference value to a brake cylinder to enable the brake cylinder to perform air brake; wherein the pressure difference value is a pressure difference value between the second pressure value and the first pressure value output by an execution component of the air brake output unit.
Further, the method further comprises: and when the sum of the electric braking force and the air braking force is smaller than a preset value, cutting off a connecting passage between the air brake output unit and the brake cylinder.
Further, the cutting off of the connection path between the air brake output unit and the brake cylinder includes:
opening a fifth adjusting member of the air brake output unit to open a connection passage between a master cylinder and a switching member of the air brake output unit, so that the switching member operates to cut off the connection passage between the air brake output unit and the brake cylinder; wherein the switching member is provided on a connection passage between the air brake output unit and the brake cylinder; the fifth adjusting member is provided on a connection path between the switching member and the master reservoir.
Further, the method further comprises: and controlling a cut-off valve to cut off a connection path between the air brake output unit and the brake cylinder when the service signal is received, wherein the cut-off valve is provided on the connection path between the air brake output unit and the brake cylinder.
Based on the scheme, the brake control unit is used for generating a first control signal and a second control signal according to the received brake request; wherein the braking request includes an electric braking force and an air braking force, and the electric braking force is used for performing power braking. The brake control unit is also used for adjusting second control signals acting on the third adjusting component and the fourth adjusting component according to the pressure difference value acquired by the second pressure sensor, so that the pressure difference value is equivalent to the air brake force, and hybrid braking of air braking and electric braking is realized.
Furthermore, the brake control unit is further used for adjusting a first control signal acting on the first adjusting component and the second adjusting component according to a first pressure value acquired by the first pressure sensor, so that the first pressure value is equivalent to the electric braking force, the size of the air braking force corresponding to the actual electric braking force can be simulated through the first equivalent unit, the air braking force output by the air brake output unit can be adjusted according to the output of the first equivalent unit, the size of the obtained air braking force is more accurate, and the size of the power brake is more matched with the size of the air brake.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic illustration of a brake control apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection of the brake application unit, the vehicle control unit and the brake control unit in one embodiment of the present invention;
FIG. 3 is a schematic structural view of an air delivery unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a first equivalent unit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a second equivalent element according to an embodiment of the present invention;
FIG. 6 is a schematic view of another embodiment of an air delivery unit according to the present invention;
FIG. 7 is a schematic structural diagram of a first equivalent unit, a second equivalent unit and an air output unit in an embodiment of the invention;
FIG. 8 is a flow chart of a braking control method according to yet another embodiment of the present invention;
FIG. 9 is a flow chart of a braking control method according to yet another embodiment of the present invention;
fig. 10 is a flowchart of a braking control method according to still another embodiment of the present invention.
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. 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 this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1, a schematic structural diagram of a brake control device according to an embodiment of the present invention is shown, including: a
A
In this embodiment, the braking request may be obtained by the vehicle control unit and sent to the
in one implementation, the
In another implementation, the driver can brake by operating the brake controller, the
The first
In this embodiment, the first pressure sensor is configured to collect a first pressure value output by the output end and return the first pressure value to the brake control unit. The first and second adjusting means are switching means that can adjust the amount of gas in the connecting passage of the first
It can be understood that: the change of the gas pressure in the connection channel can be achieved by adjusting the gas input and gas output in the connection channel, so that the present embodiment can be provided with a first adjusting means and a second adjusting means in the gas input branch (between the master reservoir to the output of the first equivalent unit 102) and/or in the gas output branch (at the location of the output of the connection channel or after the output of the connection channel), respectively.
For example, the first regulating component may be a switching component that regulates the flow of gas from the main reservoir to the output of the first
The operation of the first control signal will be described below by taking as an example that the first regulating member is a switching member for regulating the flow rate of the gas from the master reservoir to the output end of the first
The second
In the present embodiment, the third adjustment member and the fourth adjustment member are switch members that can adjust the amount of gas in the connection path of the second
It can be understood that: the change of the gas pressure in the connection channel can be achieved by adjusting the gas input and gas output in the connection channel, so that the present embodiment can be provided with a third adjusting means and a fourth adjusting means in the gas input branch (between the master reservoir to the output of the first equivalent unit 102) and/or in the gas output branch (at the location of the output of the connection channel or after the output of the connection channel), respectively. For example, the third regulating element may be a switching element that regulates the flow of gas from the main reservoir to the output of the second
The air
To facilitate the maintenance of the device, the air
The
In this embodiment, the
However, the points to be explained here are: after the first pressure value output by the first
The
In this embodiment, the
The embodiment realizes the hybrid braking of air braking and dynamic braking, the hybrid braking is a braking control mode which can perform the air braking and the dynamic braking at the same time, compared with the mode of only using one braking control in the prior art, the hybrid braking is performed simultaneously because the dynamic braking and the air braking, under the same braking requirement, the required air braking force is smaller than the air braking force required by only performing the air braking, the loss of basic braking components can be reduced, and the energy conservation, the cleanness and the environmental protection are better realized by using the dynamic braking to ensure that the railway vehicle can be used more.
Further, in this embodiment, the first
Referring to fig. 4, a schematic structural diagram of the first
The
The following describes an implementation manner of adjusting the first pressure value output by the output terminal through the
when the first pressure value needs to be increased, the
When the first pressure value needs to be reduced, the
When the first pressure value needs to be kept unchanged, the
The
Referring to fig. 5, it shows a schematic structural diagram of the second
The following describes an implementation manner of adjusting the second pressure value output by the output terminal through the
when the second pressure value needs to be increased, the
When the second pressure value needs to be reduced, the
When it is required to maintain the second pressure value, the
The
Another embodiment of the present invention provides a brake control apparatus, which improves the structure of the
And the
The preset value may be set as an upper limit value of the electric braking force, and if the braking force required for the vehicle is less than the upper limit value, the electric braking force is preferentially applied for dynamic braking, and it is possible to further reduce wear of the foundation brake components of the vehicle. The preset value may also be set to other values according to the scene requirement, and is not limited herein.
The
The embodiment considers that the electric braking force is preferentially adopted for dynamic braking on the basis of hybrid braking, and can further reduce the abrasion of the basic braking part of the vehicle.
For convenience of understanding, an application embodiment of the present invention will be described below, and referring to fig. 7, a schematic structural diagram of a first
The
The first
when the proportional valve conducts the connection path from the
The second
when the electromagnetic valve 2 conducts the connection path from the
The air
The sensor 3 is used for continuously/real-timely acquiring a pressure difference value output by the acting valve to the brake control unit. The
In this embodiment, another implementation manner of adjusting the second control signal is as follows: the
The cut-off valve and the switching valve are provided on a connection path between the output end of the apply valve and the
The
The embodiment realizes the hybrid braking of air braking and dynamic braking, the hybrid braking is a braking control mode which can perform the air braking and the dynamic braking at the same time, compared with the mode of only using one braking control in the prior art, the hybrid braking is performed simultaneously because the dynamic braking and the air braking, under the same braking force requirement, the required air braking force is smaller than the air braking force required by only performing the air braking, the loss of basic braking components can be reduced, and the energy conservation, the cleanness and the environmental protection are better realized by using the dynamic braking to ensure that the railway vehicle can be used more. On the basis of hybrid braking, the preferential application of dynamic braking for braking is considered, so that the abrasion of the basic braking part of the vehicle can be further reduced.
Further, in this embodiment, the first
Referring to fig. 8, a flow chart of a brake control method according to another embodiment of the present invention is shown, where the method is applied to a brake control unit in the brake control device of the above embodiment, and includes the following steps:
s801 generates a first control signal and a second control signal according to the received braking request.
In this embodiment, the first control signal acts on the first adjusting part of the first equivalent unit and the second adjusting part of the first equivalent unit in the brake control device to cause the first equivalent unit to output the first pressure value. The first regulating component and the second regulating component are switch components capable of regulating the gas quantity in the connecting passage of the first equivalent unit, and the first regulating component and the second regulating component are regulated through electric signals serving as first control signals so as to regulate the gas quantity in the connecting passage. The air pressure in the connecting passage can change along with the change of the air in the connecting passage, so that the air pressure in the connecting passage can be adjusted by adjusting the air in the connecting passage, and the first pressure value output by the output end of the first equivalent unit is further adjusted. For the operation and working process of the first adjusting component and the second adjusting component, please refer to the above embodiments, which are not described herein again. The first equivalent unit further comprises a first pressure sensor. For the structural composition and the operation of the first equivalent unit, please refer to the above embodiment and fig. 3, and details thereof are not repeated herein.
The second control signal acts on the third adjusting part of the second equivalent unit and the fourth adjusting part of the second equivalent unit in the brake control device, so that the second equivalent unit outputs a second pressure value. The third regulating member and the fourth regulating member are switching members capable of regulating the amount of gas in the connecting passage of the second equivalent unit, and the third regulating member and the fourth regulating member are regulated by an electric signal as a second control signal to regulate the amount of gas in the connecting passage. The air pressure in the connecting passage can change along with the change of the air in the connecting passage, so that the air pressure in the connecting passage can be adjusted by adjusting the air in the connecting passage, and the size of a second pressure value output by the output end of the second equivalent unit can be adjusted. For the operation descriptions of the third adjusting component and the fourth adjusting component, please refer to the above-mentioned embodiment, and for the structural composition and the operation descriptions of the second equivalent unit, please refer to the above-mentioned embodiment, which is not described herein again.
In the present embodiment, the braking request includes an electric braking force for performing power braking and an air braking force. For an explanation of how the braking request is obtained, reference is made to the above-described embodiments, which are not described in detail here.
S802, adjusting a first control signal according to a first pressure value acquired by a first pressure sensor of the first equivalent unit, so that the first pressure value is equivalent to an electric braking force. The first pressure value equivalent electric braking force means that the effect of air braking according to the first pressure value is the same as or similar to the effect of power braking according to the electric braking force. Please refer to the above embodiment for the working process of the brake control unit adjusting the first pressure value to make the first pressure value equal to the electric braking force, which is not described herein again.
And S803, adjusting a second control signal according to the pressure difference value output by the air brake output unit and collected by a second pressure sensor of the air brake output unit in the brake control device, so that the pressure difference value is equivalent to an air brake force. The pressure difference is output to the brake cylinder so as to enable the brake cylinder to perform air braking, and the pressure difference equivalent air braking force means that the air braking performed according to the pressure difference and the air braking performed according to the air braking force have the same or similar effect.
In this embodiment, the pressure difference is a pressure difference between the first pressure value and the second pressure value output by the actuator of the air brake output unit. The structural components and functions of the air brake output unit are described in the above embodiment and fig. 5-6, and will not be described herein. The size of the pressure difference value is related to the first pressure value and the second pressure value, and the adjustment of the pressure difference value can be realized by adjusting the size of the first pressure value and the second pressure value. For the working process of the brake control unit adjusting the pressure difference to make the pressure difference equal to the air braking force, please refer to the above embodiment, which is not described herein again.
The embodiment realizes the hybrid braking of air braking and dynamic braking, the hybrid braking is a braking control mode which can perform the air braking and the dynamic braking at the same time, compared with the mode of only using one braking control in the prior art, the hybrid braking is performed simultaneously because the dynamic braking and the air braking, under the same braking requirement, the required air braking force is smaller than the air braking force required by only performing the air braking, the loss of basic braking components can be reduced, and the energy conservation, the cleanness and the environmental protection are better realized by using the dynamic braking to ensure that the railway vehicle can be used more.
Furthermore, in the embodiment, the first equivalent unit is used for simulating the air braking force corresponding to the actual electric braking force, and the air braking force output by the air braking output unit is adjusted according to the output of the first equivalent unit, so that the obtained air braking force is more accurate, and the power braking force is more matched with the air braking force.
In order to further reduce the wear on the basic brake component, the invention provides a brake control method according to another embodiment, please refer to fig. 9, which shows a flow chart of the brake control method, including the following steps:
and S901, judging whether the sum of the electric braking force and the air braking force is smaller than a preset value. When the sum of the electric braking force and the air braking force is smaller than a preset value, executing a step S902; when the sum of the electric braking force and the air braking force is not less than the preset value, steps S903 to S905 are performed.
In the present embodiment, the preset value may be set as the upper limit value of the electric braking force, and if the braking force required by the vehicle is smaller than the upper limit value, step S902 is executed to preferentially apply the electric braking force for dynamic braking, so that the wear of the foundation brake component of the vehicle can be further reduced. The preset value may also be set to other values according to the scene requirement, and is not limited herein.
S902, the connection path between the air brake output unit and the brake cylinder is cut off.
After step S902 is executed, the brake control device performs power braking using only the electric braking force. One way for the brake control unit to shut off the connection between the air brake output unit and the brake cylinder is: opening a fifth adjusting component of the air brake output unit, and conducting a connecting passage between a main air cylinder and a switching component of the air brake output unit, so that the switching component acts to cut off the connecting passage between the air brake output unit and a brake cylinder; wherein the switching member is provided on a connection path between the air brake output unit and the brake cylinder; the fifth adjusting member is provided on the connecting path between the switching member and the master reservoir, as shown in fig. 6.
And S903, generating a first control signal and a second control signal according to the received braking request.
And S904, adjusting the first control signal according to a first pressure value acquired by a first pressure sensor of the first equivalent unit, so that the first pressure value is equivalent to the electric braking force.
And S905, adjusting a second control signal according to a pressure difference value output by the air brake output unit and acquired by a second pressure sensor of the air brake output unit in the brake control device, so that the pressure difference value is equivalent to an air brake force. The pressure difference is output to the brake cylinder to cause the brake cylinder to perform air braking.
Please refer to steps S801 to S803 in the above embodiments for descriptions of the working processes of steps S903 to S905, which are not described herein again.
In the embodiment, on the basis of hybrid braking in which air braking and dynamic braking are performed simultaneously, priority is given to electric braking force for dynamic braking, and wear of basic brake components of the vehicle can be further reduced.
In view of the various conditions that may occur in the brake control device, the present invention provides a brake control method according to another embodiment, please refer to fig. 10, which shows a flow chart of the brake control method, and compared with fig. 9, the following steps are added:
and S1006, when the maintenance signal is received, controlling a stop valve to cut off a connecting passage between the air brake output unit and the brake cylinder. The shutoff valve is arranged in a connecting passage between the air brake output unit and the brake cylinder.
And S1007, when the fault signal of the first equivalent unit is received, switching the mode of air braking and dynamic braking hybrid braking to a braking control mode which selects one of air braking and dynamic braking.
If the first equivalent unit fails, the first pressure value of the equivalent electric braking force cannot be obtained, and the air braking force matched with the dynamic braking cannot be obtained in the hybrid braking mode, so that the air braking force output to the brake cylinder is insufficient, and the vehicle cannot be effectively braked. Under the condition, the brake control mode is switched to one of air brake and power brake, so that the vehicle can be effectively braked.
For the description of the working process in steps S1001-S1002, refer to steps S901-S902 in the above-mentioned embodiment, and for the description of the working process in steps S1003-S1005, refer to steps S801-S803 in the above-mentioned embodiment, which are not described herein again. Of course, at least one of the above steps S1006 and S1007 may also be added to the above fig. 8, so that corresponding operations can be performed according to the service signal and/or the fault signal while air braking and dynamic braking are performed.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.