CN108248579B - Vehicle brake control device and method - Google Patents
Vehicle brake control device and method Download PDFInfo
- Publication number
- CN108248579B CN108248579B CN201810022301.2A CN201810022301A CN108248579B CN 108248579 B CN108248579 B CN 108248579B CN 201810022301 A CN201810022301 A CN 201810022301A CN 108248579 B CN108248579 B CN 108248579B
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- Prior art keywords
- pressure
- brake
- solenoid valve
- interface
- emergency
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
- B60T8/1705—Braking or traction control means specially adapted for particular types of vehicles for rail vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/665—Electrical control in fluid-pressure brake systems the systems being specially adapted for transferring two or more command signals, e.g. railway systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/18—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
Abstract
a vehicle brake control device comprises an electronic control unit and a pneumatic control unit, wherein the pneumatic control unit comprises a relay valve, a control module comprises a brake solenoid valve and a buffering solenoid valve which are communicated with the relay valve, the electronic control unit determines pre-control pressure by detecting parameters such as weight, speed, brake state, brake grade and the like of a vehicle and adjusts the input pre-control pressure to reach the calculated required pre-control pressure value through the brake solenoid valve and the buffering solenoid valve. The invention accurately calculates the required pre-control pressure and adopts a plurality of electromagnetic valves to cooperatively control the output pressure by acquiring a plurality of parameters such as the train weight, the train speed, the brake state, the brake gear and the like, and simultaneously adopts closed-loop control, thereby ensuring the accuracy of the input pre-control pressure, flexibly coping with the requirements of various brake states, and in addition, the cooperative arrangement of the emergency electromagnetic valve and the electromagnetic valves ensures the reliability of a train brake system from the aspect of hardware.
Description
Technical Field
The invention relates to the field of vehicle braking, in particular to a vehicle braking control device and method.
Background
The existing common brake control device mostly uses air spring pressure as a load signal source, utilizes an electronic control unit and a pneumatic control unit to cooperate with each other to control a basic brake device to realize braking action, the electronic control unit and the pneumatic control unit of the existing brake control device form a system by themselves, and the electronic control unit collects braking, relieving instructions and other various information, thereby ensuring the realization of the braking function. However, the existing electronic control unit only adjusts the pre-control pressure according to a certain proportion by a heavy vehicle or realizes pressure regulation by adopting a plurality of electromagnetic valves, thereby reducing the flexibility and reliability of the brake system.
Disclosure of Invention
The invention provides a flexible and reliable vehicle brake control device and method aiming at the problems of poor flexibility and poor reliability of a vehicle brake control system in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vehicle brake control apparatus includes an electronic control unit and a pneumatic control unit, the pneumatic control unit including a relay valve, the electronic control unit comprises an acquisition module, a calculation module and a control module, the control module comprises a brake solenoid valve and a relief solenoid valve which are communicated with the relay valve, the acquisition module comprises a pressure sensor for detecting the weight of the vehicle, a speed sensor for detecting a vehicle speed, a brake detecting means for detecting the number of brakes in a normal operation state, so that when the electronic control unit receives the brake signal, the calculation module calculates the required pre-control pressure of the relay valve connected with the normally working brake according to the parameters collected by the collection module, and the input pre-control pressure is adjusted to reach the calculated required pre-control pressure value through the brake solenoid valve and the relief solenoid valve.
Preferably, the acquisition module further comprises a brake gear detection device for detecting the brake level so as to calculate the instantaneous acceleration required for braking.
preferably, the control module further includes an emergency solenoid valve, an emergency brake solenoid valve and an emergency release solenoid valve, the emergency solenoid valve includes a first interface, a second interface and a third interface, the third interface can be selected to be connected with the first interface or the second interface, the brake solenoid valve, the release solenoid valve, the emergency brake solenoid valve and the emergency release solenoid valve are all passed through the emergency solenoid valve and the relay valve are communicated, the brake solenoid valve and the release solenoid valve are connected with the first interface of the emergency solenoid valve, the emergency brake solenoid valve and the emergency release solenoid valve are connected with the second interface of the emergency solenoid valve, and the third interface is connected with the relay valve.
Preferably, the first interface is further connected with a remote relieving electromagnetic valve for releasing pre-control pressure, and the remote relieving electromagnetic valve is electrically connected with a remote switch so as to control the remote relieving electromagnetic valve from a remote place.
Preferably, the first interface is connected with a first pressure sensor for detecting a first interface pressure, and the second interface is connected with a second pressure sensor for detecting a second interface pressure.
Preferably, the pneumatic control unit further includes a first air chamber and a second air chamber which are not communicated with each other, the brake solenoid valve and the relief solenoid valve are communicated with the first port through the first air chamber, and the emergency brake solenoid valve and the emergency relief solenoid valve are communicated with the second port through the second air chamber, so as to smooth the pressure change.
Preferably, the collection module further comprises a third pressure sensor in communication with the third port for detecting the pilot pressure to be supplied to the relay valve to cooperate with the control module to readjust the pilot pressure to be supplied to the relay valve.
A vehicle brake control method based on the vehicle brake control device comprises the following steps:
(S1) inputting preset parameters;
(S2) when a braking instruction is received, the collecting module sends the collected vehicle weight, vehicle speed and the number of brakes that can normally work to the calculating module;
(S3) the calculation module calculates the required pilot pressure of the relay valve connected with each normally working brake;
(S4) opening the brake solenoid valve, closing the release solenoid valve, inputting the pre-control pressure required for calculation to the relay valve, and closing the brake solenoid valve when the input pre-control pressure is equal to the calculated required pre-control pressure;
(S5) when the release command is received, the control module controls the release solenoid to open and the brake solenoid to close.
Preferably, the step (S2) further includes detecting a braking level of the vehicle braking.
Preferably, the acquisition module further includes a third pressure sensor for detecting a pilot pressure to be input to the relay valve, the preset parameter in the step (S1) includes a preset accuracy, the step (S4) includes comparing the calculated required pilot pressure with the detected pilot pressure to be input to the relay valve, and when the detected pilot pressure to be input to the relay valve is greater than the required pilot pressure and a difference between the two is outside a preset accuracy range, the brake solenoid valve is closed, the release solenoid valve is opened, the pilot pressure to be input to the relay valve is decreased until a difference between the pilot pressure to be input to the relay valve and the required pilot pressure is within the preset accuracy range, and the release solenoid valve is closed; when the pilot control pressure entering the relay valve is smaller than the required pilot control pressure and the difference value of the pilot control pressure and the required pilot control pressure is out of the preset precision range, the relief electromagnetic valve is closed, the brake electromagnetic valve is opened until the difference value of the pilot control pressure entering the relay valve and the required pilot control pressure is in the preset precision range, and the brake electromagnetic valve is closed.
Preferably, the preset parameters in the step (S1) include preset accuracy, the control module further includes an emergency solenoid valve, an emergency brake solenoid valve and an emergency release solenoid valve, the emergency solenoid valve includes a first interface, a second interface and a third interface, the third interface may be connected to the first interface or the second interface, the brake solenoid valve, the release solenoid valve, the emergency brake solenoid valve and the emergency release solenoid valve are all communicated with the relay valve through the emergency solenoid valve, the brake solenoid valve and the release solenoid valve are connected to the first interface of the emergency solenoid valve, the emergency brake solenoid valve and the emergency release solenoid valve are connected to the second interface of the emergency solenoid valve, the third interface is connected to the relay valve, the step (S2) includes judging a brake level, the step (S3) includes calculating a required pre-control pressure at a current brake level and an emergency pre-control pressure required at an emergency brake time, the step (S4) includes opening a brake solenoid valve to achieve a desired pilot pressure at the first interface, and opening an emergency brake solenoid valve to achieve a desired emergency pilot pressure at the second interface.
Preferably, the preset parameter in the step (S1) includes a preset accuracy, the control module further includes that the first interface is connected with a first pressure sensor for detecting a first interface pressure, the second interface is connected with a second pressure sensor for detecting a second interface pressure, the step (S4) includes comparing the calculated required pilot control pressure with the detected pilot control pressure to be entered into the relay valve, when the detected pressure at the first interface is greater than the required pilot control pressure and the difference between the two is outside the preset accuracy range, the brake solenoid valve is closed, the release solenoid valve is opened, so that the pressure at the first interface is reduced until the difference between the pressure at the first interface and the required pilot control pressure is within the preset accuracy range, and the release solenoid valve is closed; when the first interface is smaller than the required pre-control pressure and the difference value of the two is outside the preset precision range, the relieving electromagnetic valve is closed, the braking electromagnetic valve is opened until the difference value of the pressure at the first interface and the required pre-control pressure is within the preset precision range, and the braking electromagnetic valve is closed;
Comparing the calculated required emergency pre-control pressure with the detected pressure at the second interface, closing the emergency brake solenoid valve when the detected pressure at the second interface is greater than the required emergency pre-control pressure and the difference value between the two is out of the preset precision range, opening the emergency relief solenoid valve to reduce the pressure at the second interface until the difference value between the pressure at the second interface and the required emergency pre-control pressure is within the preset precision range, and closing the emergency relief solenoid valve; when the pressure at the second interface is smaller than the required emergency pre-control pressure and the difference value between the pressure and the required emergency pre-control pressure is out of the preset precision range, the emergency relief solenoid valve is closed, the emergency brake solenoid valve is opened until the difference value between the pressure at the second interface and the required emergency pre-control pressure is in the preset precision range, and the emergency brake solenoid valve is closed.
the invention accurately calculates the required pre-control pressure and adopts a plurality of electromagnetic valves to cooperatively control the output pressure by acquiring a plurality of parameters such as the train weight, the train speed, the brake state, the brake gear and the like, and simultaneously adopts closed-loop control, thereby ensuring the accuracy of the input pre-control pressure, flexibly coping with the requirements of various brake states, and in addition, the cooperative arrangement of the emergency electromagnetic valve and the electromagnetic valves ensures the reliability of a train brake system from the aspect of hardware.
Drawings
FIG. 1 is a schematic diagram of a vehicle brake control apparatus and method of the present invention;
FIG. 2 is a schematic structural view of a pneumatic brake unit according to the present invention;
In the figure: 1. an electronic control unit; 11. an acquisition module; 111. a pressure sensor; 112. a speed sensor; 113. a brake detection device; 114. a brake gear detection device; 115. a first pressure sensor; 116. a second pressure sensor; 117. a third pressure sensor; 118. collecting a plate; 12. a control module; 121. a brake solenoid valve; 122. a relief solenoid valve; 123. remotely relieving the electromagnetic valve; 124. an emergency braking solenoid valve; 125. an emergency release solenoid valve; 126. an emergency solenoid valve; 1261. a first interface; 1262. a second interface; 1263. a third interface; 127. a control panel; 13. a calculation module; 2. a pneumatic brake unit; 21. a first air chamber; 22. a second air chamber; 23. a relay valve.
Detailed Description
The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", "left", "right", etc. indicate the orientations or positional relationships based on the positional relationships shown in fig. 1, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
as shown in fig. 1, a vehicle brake control apparatus includes an electronic control unit 1 and a pneumatic control unit 2, the pneumatic control unit 2 comprises a relay valve 23, the electronic control unit 1 comprises an acquisition module 11, a calculation module 13 and a control module 12, the control module 12 includes a brake solenoid 121 and a relief solenoid 122 communicated with the relay valve 23, the collection module 11 includes a pressure sensor 111 for detecting the weight of the vehicle, a speed sensor 112 for detecting the speed of the vehicle, a brake detection means 113 for detecting the state of the brake, so that the calculation module 13 calculates the required pre-control pressure of the relay valve 23 connected to the normally operable brake according to the parameters collected by the collection module 11 when the electronic control unit 1 receives the braking signal, thereby adjusting the input pre-control pressure to the calculated required pre-control pressure value through the brake solenoid valve 121 and the relief solenoid valve 122.
referring to fig. 1 and 2, in the schematic diagram shown in fig. 1, a solid line is shown as an electric circuit, a dashed line is shown as an air circuit, the pneumatic control unit 2 includes a relay valve 23, and a first air chamber 21 and a second air chamber 22 communicated with an input port of pilot pressure of the relay valve 23, the first air chamber 21 and the second air chamber 22 are both closed chambers having a certain volume and not communicated with each other, the first air chamber 21 is used for providing a common pilot pressure volume, and the second air chamber 22 is used for providing a volume of emergency pilot pressure, so as to prevent abrupt increase or decrease of the pilot pressure received by the relay valve 23.
The electronic control unit 1 is used for controlling connection or disconnection of a plurality of air paths in the pneumatic control unit 2, the electronic control unit 1 comprises an acquisition module 11, a control module 12 and a calculation module 13, when a braking signal is received, the acquisition module 11 sends acquired data to the calculation module 13, the calculation module 13 calculates the required pre-control pressure and sends a calculation result to the control module 12, and the pre-control pressure output by the control module 12 is the same as the calculated required pre-control pressure. The acquisition module 11 includes a pressure sensor 111 arranged on the vehicle body for detecting the vehicle weight, a speed sensor 112 arranged on the vehicle axle for detecting the vehicle speed, a detection device 113 connected with the brake for detecting whether the brake can work normally, a brake gear detection device 114 for detecting the brake grade, a first pressure sensor 115 for detecting the pressure of the first air chamber 21, a second pressure sensor 116 for detecting the pressure of the second pressure air chamber 22, a pressure sensor 116 for detecting the pressure at the pre-control pressure input port of the relay valve 23, and an acquisition board 117 connected with each sensor.
the calculation module 13 is connected to the acquisition module 11, when a braking signal is received, the acquisition module 11 transmits the acquired data of the vehicle weight, the vehicle speed, the number of brakes capable of working normally, the braking gear and the like to the calculation module 13, the calculation module 13 calculates the braking force required by each brake of the instantaneous braking force required by braking and the pre-control pressure required by the relay valve connected to each brake according to the acquired data, and transmits the calculated pre-control pressure required by the relay valve to the control module 12.
The control module 12 includes a brake solenoid valve 121, a relief solenoid valve 122, a remote relief solenoid valve 123 communicating with the first air chamber 21, and an emergency brake solenoid valve 124, an emergency relief solenoid valve 125 communicating with the second air chamber 22, an emergency solenoid valve 126 communicating with a pilot pressure port of the relay valve 23, and a control board 127 for controlling the respective solenoid valves. The brake solenoid valve 121 is used for controlling the communication and disconnection of the total wind with the first air chamber 21, and is preferably a normally closed solenoid valve; the relieving solenoid valve 122 is used for controlling the connection and disconnection of the first air chamber 21 and the atmosphere, and is preferably a normally closed solenoid valve, the remote relieving solenoid valve 123 is used for controlling the connection and disconnection of the first air chamber 21 and the atmosphere, the remote relieving solenoid valve 123 is electrically connected with a remotely arranged switch for remote control, and is preferably arranged in a driver room for remote control of a driver, the remote relieving solenoid valve 123 is preferably a normally closed solenoid valve, the emergency braking solenoid valve 124 is used for controlling the connection and disconnection of the main air and the second air chamber 22, the emergency relieving solenoid valve 125 is used for controlling the connection and disconnection of the second air chamber 22 and the atmosphere, the emergency solenoid valve 126 is preferably a two-position three-way solenoid valve and is provided with a first interface 1261, a second interface 1262 and a third interface 1263, the first interface 1261 is communicated with the first air chamber 21, the second port 1262 is in communication with the second air chamber, the third port 1263 is in communication with the pilot pressure port of the relay valve 23, the third port 1263 can be in communication with the first port 1261 or the second port 1262 selectively, preferably, a normally open position is between the third port 1263 and the first port 1261, a normally closed position is between the third port 1263 and the second port 1262, it should be noted that the emergency solenoid valve 126 is connected in series with the train safety circuit, when the safety circuit is normally powered, the emergency solenoid valve is in an energized state, the third port 1263 and the first port 1261 are in an open position, when the safety circuit is disconnected, the third port 1263 and the second port 1262 are in an open position, such an arrangement is that one air chamber is always in communication with the pilot pressure port of the relay valve 23 in the first air chamber 21 and the second air chamber 22, and one input port is capable of inputting brake pressure in any state, the braking reliability is ensured.
Referring to fig. 3, the operation principle of the disclosed vehicle brake control apparatus is as follows.
(S1) inputting preset parameters into the calculation module 13, wherein the preferable parameters of the invention comprise pressure precision P, pre-control pressure delay time td, brake cylinder inflation time tp, clamp multiplying power ic, friction coefficient ud, clamp transmission efficiency etac, friction radius r, wheel diameter D, brake external reverse force Ft, brake internal reverse force Fn, brake internal transmission efficiency eta, brake multiplying power i, effective brake cylinder piston area A and acceleration ae corresponding to brake grade.
(S2) when the electronic brake unit 1 receives the braking instruction, the acquisition module 11 transmits the collected parameters of the vehicle weight M, the vehicle speed v, the number Nc of brakes which can normally work, the braking gear position and the like to the calculation module 13.
(S3) the calculation module 13 calculates the required instantaneous acceleration at according to the vehicle weight M, the vehicle speed v and the brake gear, where it is to be noted that, in the judgment of the brake gear, it is first judged whether the brake is a normal brake or an emergency brake, if the brake is an emergency brake, the subsequent calculation is performed according to the instantaneous acceleration in the preset parameters, if the brake is a normal brake, the required instantaneous acceleration is calculated according to the knowledge of only the gear, then the required braking force of each brake and the pilot pressure of the relay valve 23 are calculated according to the detected number of brakes that can normally work, and the calculated result is transmitted to the control board 127 of the control module 12, and the control board controls the solenoid valve according to the obtained result.
Said instantaneous acceleration at
Bogie required braking force Fac
F＝Ma
Output force Fz of each brake
pre-controlled pressure Pz
And the calculation module sends the calculated pre-control pressure Pz to the control module.
(S4) when a signal of normal braking is received, the safety circuit is kept in a power-on state, the emergency solenoid valve 126 is not changed, the open position between the first connection port and the third connection port is kept, the brake solenoid valve 121 and the emergency brake solenoid valve 124 are opened, the wind is filled into the first air chamber 21, the first pressure sensor 115 detects the pressure in the first air chamber 21 and transmits the pressure to the control board 127, the third pressure sensor 117 detects the pressure at the outlet of the third connection port 1263 and feeds the pressure back to the collecting board 118, the collecting board 118 transmits the data to the calculating module 13, the calculating module 13 compares the detected pressure with the calculated pressure, and if the detected pressure is greater than the calculated required pilot control pressure and the difference between the detected pressure and the required pilot control pressure is greater than the accuracy range transmitted by the preset parameters, the control board 127 controls the relief solenoid valve 112 to be opened, when the brake solenoid valve 111 is closed, the pressure in the first air chamber 21 is reduced, if the measured pressure is smaller than the calculated required pre-control pressure and the difference between the measured pressure and the calculated required pre-control pressure is larger than the precision range transmitted in the preset parameter, the control board 127 controls the release solenoid valve 112 to be closed, and the brake solenoid valve 111 is opened, the pressure in the first air chamber 21 is increased until the difference between the measured pressure and the calculated required pre-control pressure meets the precision of the preset parameter input, so that the pressure in the first air chamber 21 is always kept at about the calculated required pre-control pressure.
When an emergency brake signal is received, the safety circuit is disconnected, the emergency solenoid valve 126 is in a power-off state, the first interface 1261 and the third interface 1263 in the emergency solenoid valve 126 are in an off position, the second interface 1262 and the third interface 1263 are in an on position, the emergency brake solenoid valve 124 is opened, the general wind is charged into the second air chamber 22, the second pressure sensor 116 detects the pressure in the second air chamber 22 and transmits the pressure to the control board 127, the third pressure sensor 117 detects the pressure at the outlet of the third interface 1263 and feeds the pressure back to the acquisition board 118, the acquisition board 118 transmits data to the calculation module 13, the calculation module 13 compares the measured pressure with the calculated pressure, if the measured pressure is greater than the calculated required pilot control pressure and the difference between the measured pressure and the calculated required pilot control pressure is greater than the precision range transmitted by the preset parameter, the control board 127 controls the emergency relief solenoid valve 125 to be opened, the emergency braking solenoid valve 124 is closed to reduce the pressure in the second air chamber 22, if the measured pressure is less than the calculated required pre-control pressure and the difference between the measured pressure and the calculated required pre-control pressure is greater than the precision range transmitted in the preset parameter, the control board 127 controls the emergency relief solenoid valve 125 to close, the emergency braking solenoid valve 124 is opened to increase the pressure in the second air chamber 22 until the difference between the measured pressure and the calculated required pre-control pressure meets the precision input by the preset parameter, and the emergency braking solenoid valve 124 and the emergency relief solenoid valve 125 are both closed to keep the pressure in the second air chamber 22 around the calculated required pre-control pressure.
(S5) in the normal braking state, when the braking state needs to be released, the pre-control pressure can be released through the release solenoid valve 122, or the remote release solenoid valve 123 can be opened through a switch arranged in the driver' S cabin and connected with the remote release solenoid valve 123, so as to release the braking state.
In the emergency braking state, unlike the conventional braking, the emergency braking is not provided with a remote release switch, and when the emergency braking state needs to be contacted, the pre-control pressure can be released only through the emergency release solenoid valve 125, so that the braking state is released.
The invention accurately calculates the required pre-control pressure and adopts a plurality of electromagnetic valves to cooperatively control the output pressure by acquiring a plurality of parameters such as the train weight, the train speed, the brake state, the brake gear and the like, and simultaneously adopts closed-loop control, thereby ensuring the accuracy of the input pre-control pressure, flexibly coping with the requirements of various brake states, and in addition, the cooperative arrangement of the emergency electromagnetic valve and the electromagnetic valves ensures the reliability of a train brake system from the aspect of hardware.
Claims (12)
1. A vehicle brake control device comprises an electronic control unit and a pneumatic control unit, wherein the pneumatic control unit comprises a relay valve, the electronic control unit comprises an acquisition module, a calculation module and a control module, the control module comprises a brake solenoid valve and a buffering solenoid valve which are communicated with the relay valve, and the vehicle brake control device is characterized in that: the acquisition module comprises a pressure sensor for detecting the weight of the vehicle, a speed sensor for detecting the speed of the vehicle and a brake detection device for detecting the number of brakes in a normal working state, so that when the electronic control unit receives a brake signal, the calculation module calculates the required pre-control pressure of a relay valve connected with the normally working brake according to the parameters acquired by the acquisition module, thereby adjusting the input pre-control pressure to reach the calculated required pre-control pressure value through the brake solenoid valve and the relief solenoid valve.
2. The vehicle brake control apparatus according to claim 1, characterized in that: the acquisition module further comprises a brake gear detection device for detecting the brake grade so as to calculate the instantaneous acceleration required by braking.
3. The vehicle brake control apparatus according to claim 1, characterized in that: the control module further comprises an emergency electromagnetic valve, an emergency brake electromagnetic valve and an emergency relief electromagnetic valve, wherein the emergency electromagnetic valve comprises a first interface, a second interface and a third interface, the third interface can be selected to be connected with the first interface or the second interface, the brake electromagnetic valve, the relief electromagnetic valve, the emergency brake electromagnetic valve and the emergency relief electromagnetic valve are all communicated with the relay valve, the brake electromagnetic valve and the relief electromagnetic valve are connected with the first interface of the emergency electromagnetic valve, the emergency brake electromagnetic valve and the emergency relief electromagnetic valve are connected with the second interface of the emergency electromagnetic valve, and the third interface is connected with the relay valve.
4. The vehicle brake control apparatus according to claim 3, characterized in that: the first interface is also connected with a remote release solenoid valve for releasing pre-control pressure, and the remote release solenoid valve is electrically connected with a remote switch so as to remotely control the remote release solenoid valve from a distance.
5. the vehicle brake control apparatus according to claim 4, characterized in that: the first interface is connected with a first pressure sensor for detecting the pressure of the first interface, and the second interface is connected with a second pressure sensor for detecting the pressure of the second interface.
6. The vehicle brake control apparatus according to claim 3, characterized in that: the pneumatic control unit further comprises a first air chamber and a second air chamber which are not communicated, the brake solenoid valve and the relief solenoid valve are communicated with the first interface through the first air chamber, and the emergency brake solenoid valve and the emergency relief solenoid valve are communicated with the second interface through the second air chamber so as to smooth pressure changes.
7. The vehicle brake control apparatus according to any one of claims 3 to 6, characterized in that: the acquisition module further comprises a third pressure sensor in communication with the third interface for detecting a pilot pressure to be admitted to the relay valve to cooperate with the control module to readjust the pilot pressure to be admitted to the relay valve.
8. A vehicle brake control method based on the vehicle brake control device according to any one of claims 1 to 7, comprising the steps of:
(S1) inputting preset parameters;
(S2) when a braking instruction is received, the collecting module sends the collected vehicle weight, vehicle speed and the number of brakes that can normally work to the calculating module;
(S3) the calculation module calculates the required pilot pressure of the relay valve connected with each normally working brake;
(S4) opening the brake solenoid valve, closing the release solenoid valve, inputting the pre-control pressure required for calculation to the relay valve, and closing the brake solenoid valve when the input pre-control pressure is equal to the calculated required pre-control pressure;
(S5) when the release command is received, the control module controls the release solenoid to open and the brake solenoid to close.
9. The vehicle brake control method according to claim 8, characterized in that: the step (S2) further includes detecting a braking level of the vehicle braking.
10. the vehicle brake control method according to claim 8, characterized in that: the acquisition module further comprises a third pressure sensor for detecting a pilot pressure to be input into the relay valve, the preset parameter in the step (S1) comprises a preset accuracy, the step (S4) comprises comparing the calculated required pilot pressure with the detected pilot pressure to be input into the relay valve, when the detected pilot pressure to be input into the relay valve is greater than the required pilot pressure and the difference between the two is outside the preset accuracy range, the brake solenoid valve is closed, the relief solenoid valve is opened, the pilot pressure to be input into the relay valve is reduced, and the relief solenoid valve is closed until the difference between the pilot pressure to be input into the relay valve and the required pilot pressure is within the preset accuracy range; when the pilot control pressure entering the relay valve is smaller than the required pilot control pressure and the difference value of the pilot control pressure and the required pilot control pressure is out of the preset precision range, the relief electromagnetic valve is closed, the brake electromagnetic valve is opened until the difference value of the pilot control pressure entering the relay valve and the required pilot control pressure is in the preset precision range, and the brake electromagnetic valve is closed.
11. The vehicle brake control method according to claim 8, characterized in that: the preset parameters in the step (S1) include preset accuracy, the control module further includes an emergency solenoid valve, an emergency brake solenoid valve, and an emergency release solenoid valve, the emergency solenoid valve includes a first interface, a second interface, and a third interface, the third interface may be connected to the first interface or the second interface, the brake solenoid valve, the release solenoid valve, the emergency brake solenoid valve, and the emergency release solenoid valve are all communicated with the relay valve through the emergency solenoid valve, the brake solenoid valve and the release solenoid valve are connected to the first interface of the emergency solenoid valve, the emergency brake solenoid valve and the emergency release solenoid valve are connected to the second interface of the emergency solenoid valve, the third interface is connected to the relay valve, the step (S2) includes judging a brake level, the step (S3) includes calculating a required pre-control pressure at the current brake level and a required emergency pre-control pressure at the time of emergency braking, the step (S4) includes opening a brake solenoid valve to achieve a desired pilot pressure at the first interface, and opening an emergency brake solenoid valve to achieve a desired emergency pilot pressure at the second interface.
12. the vehicle brake control method according to claim 11, characterized in that: the preset parameter in the step (S1) includes a preset accuracy, the control module further includes that the first interface is connected with a first pressure sensor for detecting a first interface pressure, the second interface is connected with a second pressure sensor for detecting a second interface pressure, the step (S4) includes comparing the calculated required pre-control pressure with the detected pre-control pressure to be entered into the relay valve, when the detected pressure at the first interface is greater than the required pre-control pressure and the difference between the two is outside the preset accuracy range, the brake solenoid valve is closed, the release solenoid valve is opened, the pressure at the first interface is reduced, until the difference between the pressure at the first interface and the required pre-control pressure is within the preset accuracy range, and the release solenoid valve is closed; when the first interface is smaller than the required pre-control pressure and the difference value of the two is outside the preset precision range, the relieving electromagnetic valve is closed, the braking electromagnetic valve is opened until the difference value of the pressure at the first interface and the required pre-control pressure is within the preset precision range, and the braking electromagnetic valve is closed;
Comparing the calculated required emergency pre-control pressure with the detected pressure at the second interface, closing the emergency brake solenoid valve when the detected pressure at the second interface is greater than the required emergency pre-control pressure and the difference value between the two is out of the preset precision range, opening the emergency relief solenoid valve to reduce the pressure at the second interface until the difference value between the pressure at the second interface and the required emergency pre-control pressure is within the preset precision range, and closing the emergency relief solenoid valve; when the pressure at the second interface is smaller than the required emergency pre-control pressure and the difference value between the pressure and the required emergency pre-control pressure is out of the preset precision range, the emergency relief solenoid valve is closed, the emergency brake solenoid valve is opened until the difference value between the pressure at the second interface and the required emergency pre-control pressure is in the preset precision range, and the emergency brake solenoid valve is closed.
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| CN201810022301.2A CN108248579B (en) | 2018-01-10 | 2018-01-10 | Vehicle brake control device and method |
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| CN201810022301.2A CN108248579B (en) | 2018-01-10 | 2018-01-10 | Vehicle brake control device and method |
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| CN108248579B true CN108248579B (en) | 2019-12-06 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209921327U (en) * | 2019-05-22 | 2020-01-10 | 中车长春轨道客车股份有限公司 | Rail train braking system |
| CN111002965B (en) * | 2019-12-12 | 2021-03-16 | 中铁轨道交通装备有限公司 | Dynamic mass correction method and braking force calculation method for railway vehicle |
| KR20210074947A (en) * | 2019-12-12 | 2021-06-22 | 주식회사 만도 | Electronic parking brake system and control method thereof |
| CN112061093B (en) * | 2020-09-21 | 2021-07-20 | 中车青岛四方车辆研究所有限公司 | Locomotive braking system for realizing automatic driving and realization method thereof |
| CN113104058B (en) * | 2021-05-28 | 2023-01-06 | 中车青岛四方车辆研究所有限公司 | Air brake control unit, brake control device and method for railway vehicle |
| CN113120024B (en) * | 2021-06-02 | 2022-06-28 | 中国铁道科学研究院集团有限公司 | Pure air emergency braking control method and control device for railway vehicle braking system |
| CN113291276B (en) * | 2021-06-29 | 2022-04-19 | 中车制动系统有限公司 | Pressure control method and system for brake cylinder of urban rail vehicle |
| CN113335243B (en) * | 2021-07-01 | 2022-07-01 | 中车制动系统有限公司 | Braking force control method and device |
| CN113246935A (en) * | 2021-07-01 | 2021-08-13 | 青岛思锐科技有限公司 | Frame control pneumatic brake control method and device |
| CN117006178B (en) * | 2023-08-04 | 2024-03-01 | 大庆石油管理局有限公司 | Flexible braking device of tower crane |
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