CN107351824B - Braking method and system for vehicle under sliding - Google Patents
Braking method and system for vehicle under sliding Download PDFInfo
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- CN107351824B CN107351824B CN201710545449.XA CN201710545449A CN107351824B CN 107351824 B CN107351824 B CN 107351824B CN 201710545449 A CN201710545449 A CN 201710545449A CN 107351824 B CN107351824 B CN 107351824B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
- B60L7/26—Controlling the braking effect
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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
- 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
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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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
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
Abstract
The invention provides a braking method and a braking system for a vehicle under sliding. The method comprises the following steps: the brake control unit calculates a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle; the brake control unit determines the current sliding state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft; the brake control unit judges whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle; if the electric braking signal meets the preset requirement, the braking control unit sends an electric braking cutting signal to the traction control unit; the traction control unit cuts off the electric brake according to the electric brake cut-off signal. The invention can cut off the electric brake of the vehicle in time when the vehicle slides seriously, and avoid the wheel set abrasion accident.
Description
Technical Field
The invention relates to the field of vehicle braking, in particular to a braking method and a braking system for a vehicle under sliding.
Background
Both the brake control unit (hereinafter abbreviated as BCU) and the traction control unit (hereinafter abbreviated as TCU) have a coasting detection function. BCU controls air brake antiskid, auxiliary control electric brake antiskid, and TCU controls electric brake antiskid, therefore, BCU and TCU both carry out simple information interaction, do not influence respective antiskid control.
The current vehicle brake antiskid control technology is also mastered by the outside. The control strategy of the antiskid system is designed according to the research result of the adhesion mechanism of each country and is suitable for the adhesion characteristic of the national wheel rail; the railway application environment and the wheel-rail adhesion characteristics of China are obviously different from those of China abroad, so that wheel set scratching accidents of different degrees occur in the initial stage of the introduction of the existing high-speed motor train unit, and a method for cutting off electric braking of a vehicle, which is suitable for the autonomous high-speed motor train unit of China, does not exist in the prior art.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a braking method and a braking system for a vehicle under sliding, so that electric braking of the vehicle is timely cut off when the vehicle slides seriously, and the wheel set abrasion accident is avoided.
In order to achieve the above object, an embodiment of the present invention provides a braking method for a vehicle during coasting, including:
the brake control unit calculates a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle;
the brake control unit determines the current sliding state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft;
the brake control unit judges whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
if the electric braking signal meets the preset requirement, the braking control unit sends an electric braking cutting signal to the traction control unit;
the traction control unit cuts off the electric brake according to the electric brake cut-off signal.
In one embodiment, when the traction control unit is in the vehicle control mode, the electric brake cut condition comprises:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the like, or, alternatively,
the difference value between the vehicle speed and the reference speed is higher than a second preset value in a second preset time; or the like, or, alternatively,
the difference between the reference speed and the axle speed of one of the axles of the vehicle is higher than a third predetermined value for a third predetermined time.
In one embodiment, when the traction control unit is in the rack control mode, the electric brake cut condition comprises:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the like, or, alternatively,
the difference value between the vehicle speed and the reference speed is higher than the first preset value in a second preset time; or the like, or, alternatively,
the difference between the reference speed and the axle speed of one of the axles of the bogie corresponding to the current traction control unit is higher than a fourth preset value within a fourth preset time.
In one embodiment, the determining, by the brake control unit, the current coasting state of each axle according to the difference between the reference speed and the axle speed of each axle and the axle deceleration of each axle specifically includes:
the brake control unit determines a current coasting state of each axle based on a difference between the reference speed and the axle speed of each axle, and the axle deceleration of each axle.
In one embodiment, the method further comprises the following steps:
the brake control unit sends an electric brake reducing signal to the traction control unit, wherein the electric brake reducing signal comprises the maximum value of an electric brake reducing numerical value;
the traction control unit reduces the electric braking force of the vehicle in accordance with the electric brake reduction signal.
In one embodiment, the method further comprises the following steps:
the brake control unit controls the anti-skid valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft so as to adjust the pressure of the brake cylinder corresponding to each shaft and reduce the air brake force.
In one embodiment, the brake control unit controls the anti-skid valve of each axle according to the air brake reduction time corresponding to the current sliding state of each axle, and specifically includes:
and the brake control unit controls the pressure retaining valve and the exhaust valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft.
The embodiment of the invention also provides a braking system for the vehicle under sliding, which comprises a braking control unit and a traction control unit;
the brake control unit includes:
a calculation module for calculating a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle;
the sliding state module is used for determining the current sliding state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft;
the judging module is used for judging whether the vehicle meets an electric brake cutting condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
the sending module is used for sending an electric brake cutting signal to the traction control unit;
the traction control unit is used for cutting off the electric brake according to the electric brake cutting signal.
In one embodiment, the coasting state module is specifically configured to:
the current coasting state of each axle is determined based on the difference between the reference speed and the axle speed of each axle, and the axle deceleration of each axle.
In one embodiment, the brake control unit is further configured to: sending an electric brake reduction signal to the traction control unit, wherein the electric brake reduction signal comprises the maximum value of an electric brake reduction value;
the traction control unit is further configured to: the electric braking force of the vehicle is reduced according to the electric brake reduction signal.
In one embodiment, the brake control unit further comprises an air brake reduction module;
the air brake reduction module is to: and controlling the anti-skid valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft to adjust the pressure of the brake cylinder corresponding to each shaft so as to reduce the air brake force.
In one embodiment, the air brake reduction module is specifically configured to:
and controlling the pressure retaining valve and the exhaust valve of each shaft according to the air braking reduction time corresponding to the current sliding state of each shaft.
According to the braking method and the braking system under the condition of vehicle sliding, a braking control unit of the vehicle calculates the reference speed of the vehicle and the shaft deceleration of each shaft according to the shaft speed of each shaft, and determines the current sliding state of each shaft according to the difference value of the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft. The vehicle braking control unit further judges whether the vehicle meets an electric braking removal condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of the electric braking reduction value corresponding to the current sliding state of each axle, if so, the braking control unit sends an electric braking removal signal to the traction control unit, and the traction control unit removes the electric braking according to the electric braking removal signal. The invention can cut off the electric brake of the vehicle in time when the vehicle slides seriously, and avoid the wheel set abrasion accident.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a braking method under coasting condition of a vehicle in an embodiment of the present invention;
FIG. 2 is a block diagram of a braking system for a vehicle under coasting in accordance with an embodiment of the present invention;
fig. 3 is a block diagram of one embodiment of the braking system under vehicle coasting in accordance with 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 view of the fact that no method for cutting off electric brake of a vehicle suitable for the autonomous high-speed motor train unit in China exists at present, the embodiment of the invention provides a braking method and a braking system under vehicle sliding. The vehicle braking control unit further judges whether the vehicle meets an electric braking removal condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of the electric braking reduction value corresponding to the current sliding state of each axle, if so, the braking control unit sends an electric braking removal signal to the traction control unit, and the traction control unit removes the electric braking according to the electric braking removal signal. The invention can cut off the electric brake of the vehicle in time when the vehicle slides seriously, and avoid the wheel set abrasion accident.
The present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a braking method under coasting of a vehicle in an embodiment of the present invention. As shown in fig. 1, the braking method under the condition of vehicle sliding comprises the following steps:
step 101: the brake control unit calculates a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle.
Step 102: the brake control unit determines a current coasting state of each axle based on a difference between the reference speed and the axle speed of each axle, and the axle deceleration of each axle.
Step 103: the brake control unit judges whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
step 104: the brake control unit sends an electric brake cut-off signal to the traction control unit;
step 105: the traction control unit cuts off the electric brake according to the electric brake cut-off signal.
Before performing step 101, a speed sensor located on each axle collects the axle speed of each axle and sends it to a Brake Control Unit (BCU). A Train Control and Management System (TCMS) collects the vehicle speed and sends it to the brake Control unit.
During electric braking, the brake control unit specifically judges the current sliding state of each shaft in the following way: the current coasting state of each axle is determined based on the difference between the reference speed and the axle speed of each axle, and the axle deceleration of each axle. In particular, the difference between the reference speed and the shaft speed can be divided into a1-aiI stages in total, dividing the shaft deceleration into b1-bjJ levels are formed, a sliding state matrix table with i multiplied by j levels is formed, and each level corresponds to a sliding state one by one. For example, when the difference between the reference speed and the axle speed is at the x-th level and the axle deceleration is at the y-th level, the coasting condition is the x-th row of the matrix tableAnd the y-th row corresponds to a coasting state. Wherein the reference speed of the vehicle is a maximum value of the shaft speeds.
When the Traction Control Unit (TCU) is in the vehicle control mode, the electric brake removal condition in step 103 specifically includes:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the difference value between the vehicle speed and the reference speed is higher than a second preset value within a second preset time; or the difference between the reference speed and the axle speed of one of the axles of the vehicle is higher than a third preset value within a third preset time.
When the traction control unit is in the frame control mode, the electric brake removal condition in step 103 specifically includes:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the difference value between the vehicle speed and the reference speed is higher than the first preset value in a second preset time; or the difference value between the reference speed and the axle speed of one axle of the bogie corresponding to the current traction control unit is higher than a fourth preset value in a fourth preset time. In the bogie control mode, one traction control unit controls two bogies, one brake control unit and two axles for each bogie, respectively. Generally, the axle speeds of two axles located on the same bogie are substantially equal.
In the embodiment, when the adhesion condition between the wheel and the rail is poor and the wheel set of the vehicle slides, the brake control unit firstly adopts the air-electric composite brake, namely, the air brake antiskid and the electric brake antiskid are simultaneously carried out, so that the vehicle can be inhibited from sliding, the wheel set of the vehicle is prevented from being scratched, and the adhesion is fully utilized to shorten the braking distance under the adverse adhesion condition. If the brake control unit determines that the wheel is slipping severely (i.e., the electric brake cut condition in step 103 is satisfied), it indicates that air brake anti-slip and electric brake anti-slip are hardly effective. At the moment, in order to avoid the abnormal calculation of the reference speed of the vehicle (the reference speed of the vehicle is not the maximum value in the axle speed) and the wheel pair abrasion caused by the coupling action of the parallel traction motors, the brake control unit sends an electric brake cutting signal to the traction control unit, and the electric brake is cut off after the electric brake cutting signal is received by the traction control unit. Meanwhile, the brake control unit still adopts independent air brake for skid prevention after the electric brake is cut off so as to ensure the skid prevention control and the train braking distance.
When the electric brake is used for skid prevention, the brake control unit sends an electric brake reducing signal to the traction control unit, wherein the electric brake reducing signal comprises the maximum value of an electric brake reducing numerical value; the traction control unit reduces the electric braking force of the vehicle in accordance with the electric brake reduction signal. For example, in the rack control mode, the electric brake reduction value corresponding to one axis is 10%, and the electric brake reduction value corresponding to the other axis is 30%; at this time, the electric brake reduction value sent by the brake control unit is 30%, and the traction control unit reduces the original electric brake force by 30% according to the electric brake reduction signal.
When the air brake is used for skid prevention, the method of adjusting the pressure of the brake cylinder is adopted to control the skid re-adhesion. In an embodiment, the brake control unit controls the anti-skid valve of each axle according to the air brake reduction time corresponding to the current sliding state of each axle, so as to adjust the pressure of the brake cylinder corresponding to each axle and reduce the air brake force. Unlike electric braking, the current coasting state of each axle of the vehicle is determined at this time based on the difference between the reference speed and the axle speed of each axle and the axle deceleration of each axle. The current coasting situation of each axle is different, as is the pressure regulation for each brake cylinder.
The antiskid valve comprises a pressure retaining valve and an exhaust valve. The brake control unit controls a pressure retaining valve and an exhaust valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft; the airbrake reduction time includes a duration of power-up of the pressure retention valve and a duration of power-up of the exhaust valve.
In an embodiment, the brake control unit resets the electric brake cut signal when the vehicle satisfies the electric brake cut reset condition. The electric brake cut-off reset condition includes: finishing the sliding of the vehicle; or, this braking is over (e.g., braking is released or braking is changed to traction); or, the vehicle is stopped.
Fig. 3 is a block diagram of one embodiment of the braking system under vehicle coasting in accordance with the present invention. As shown in fig. 3, the brake control unit transmits an electric brake reducing signal or an electric brake cut signal to the traction control unit through an MVB (multifunction vehicle bus) or a hard wire.
The invention is adopted on models of Chinese standard motor train units with 350 km per hour, long-passenger hybrid motor train units, Tangshan 160km intercity motor train units and the like, and the current vehicle test and operation assessment effects are good. Referring to fig. 3, the specific implementation of the present invention is as follows:
1. the brake control unit calculates the reference speed of the vehicle and the axle deceleration of 4 axles according to the axle speeds of 4 axles acquired by the 4-way speed sensor; vehicle speed is received from a train control and management system.
2. The brake control unit determines the current sliding state of 4 shafts of the vehicle according to 4 difference values of the reference speed and the 4 shaft speeds and 4 shaft decelerations, and further determines the maximum value of the electric brake reduction value corresponding to the current sliding state of the 4 shafts and the air brake reduction time of the 4 shafts.
3. The brake control unit sends an electric brake reducing signal containing the maximum value of the electric brake reducing value through a multifunctional vehicle bus or a hard wire, and the traction control unit reduces the electric brake force of the vehicle according to the electric brake reducing signal; meanwhile, the pressure retaining valves and the exhaust valves of the 4 shafts are controlled according to the air brake reduction time corresponding to the current sliding state of the 4 shafts, so that the pressure of the brake cylinders corresponding to the 4 shafts is adjusted, and the air brake force is reduced.
4. The brake control unit judges whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the shaft speed, the difference value between the reference speed and the shaft speed of each shaft and the maximum value of the electric brake reduction value corresponding to the current sliding state; if the electric brake is met, an electric brake cutting signal is sent to the traction control unit through the multifunctional vehicle bus or the hard wire, and the traction control unit cuts off the electric brake according to the electric brake cutting signal.
5. The brake control unit resets the electric brake cut signal when the vehicle satisfies the electric brake cut reset condition.
Based on the same inventive concept, the embodiment of the invention also provides a braking system under the condition that the vehicle slides, and as the principle of solving the problems of the system is similar to the braking method under the condition that the vehicle slides, the implementation of the system can refer to the implementation of the method, and repeated parts are not repeated.
Fig. 2 is a block diagram showing the construction of the braking system under coasting of the vehicle in the embodiment of the present invention. As shown in fig. 2, the braking system for a vehicle under coasting may include: a brake control unit and a traction control unit.
The brake control unit includes:
a calculation module for calculating a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle;
the sliding state module is used for determining the current sliding state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft;
the judging module is used for judging whether the vehicle meets an electric brake cutting condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
the sending module is used for sending an electric brake cutting signal to the traction control unit;
the traction control unit is used for cutting off the electric brake according to the electric brake cutting signal.
In an embodiment of the present invention, the coasting state module is specifically configured to:
the current coasting state of each axle is determined based on the maximum value of the difference between the reference speed and the axle speed of each axle, and the maximum value of the axle deceleration of each axle.
In one embodiment of the invention, the brake control unit is further configured to: sending an electric brake reduction signal to the traction control unit, wherein the electric brake reduction signal comprises the maximum value of an electric brake reduction value;
the traction control unit is further configured to: the electric braking force of the vehicle is reduced according to the electric brake reduction signal.
In a particular embodiment of the invention, the brake control unit further comprises an air brake reduction module;
the air brake reduction module is to: and controlling the anti-skid valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft to adjust the pressure of the brake cylinder corresponding to each shaft so as to reduce the air brake force.
In one embodiment of the invention, the air brake reduction module is specifically configured to:
and controlling the pressure retaining valve and the exhaust valve of each shaft according to the air braking reduction time corresponding to the current sliding state of each shaft.
In summary, according to the braking method and system under vehicle coasting of the embodiment of the present invention, the braking control unit of the vehicle calculates the reference speed of the vehicle and the axle deceleration of each axle according to the axle speed of each axle, and determines the current coasting state of each axle according to the difference between the reference speed and the axle speed of each axle and the axle deceleration of each axle. The vehicle braking control unit further judges whether the vehicle meets an electric braking removal condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of the electric braking reduction value corresponding to the current sliding state of each axle, if so, the braking control unit sends an electric braking removal signal to the traction control unit, and the traction control unit removes the electric braking according to the electric braking removal signal. The invention can cut off the electric brake of the vehicle in time when the vehicle slides seriously, and avoid the wheel set abrasion accident.
The present invention also performs air brake anti-skid and electric brake anti-skid to inhibit vehicle sliding, prevent vehicle wheel pair from being scratched, and utilize adhesion to shorten braking distance in unfavorable adhesion condition.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of braking a vehicle while coasting, comprising:
the brake control unit calculates a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle;
the brake control unit determines the current sliding state of each shaft according to the difference value of the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft;
the brake control unit judges whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
if the electric braking signal meets the preset requirement, the braking control unit sends an electric braking cutting signal to the traction control unit;
the traction control unit cuts off the electric brake according to the electric brake cutting signal;
the brake control unit determines the current coasting state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft, and specifically includes:
the brake control unit determines the current sliding state of each shaft according to the difference value between the reference speed and the shaft speed of each shaft and the shaft deceleration of each shaft;
determining the current sliding state of each axis through a matrix mapping table; the matrix mapping table is a sliding state matrix table with i x j levels, and each level corresponds to a sliding state one by one.
2. The method of braking a vehicle under coast according to claim 1, wherein the electric brake cut condition comprises, when the traction control unit is in the vehicle control mode:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the like, or, alternatively,
the difference value between the vehicle speed and the reference speed is higher than a second preset value within second preset time; or the like, or, alternatively,
the difference between the reference speed and the axle speed of one of the axles of the vehicle is higher than a third predetermined value for a third predetermined time.
3. The method of braking a vehicle under coast according to claim 1, wherein the electric brake cut-off condition comprises, when the traction control unit is in the rack control mode:
the maximum value of the electric brake reduction value is higher than a first preset value in a first preset time; or the like, or, alternatively,
the difference value between the vehicle speed and the reference speed is higher than a first preset value in a second preset time; or the like, or, alternatively,
and the difference value between the reference speed and the axle speed of one axle of the bogie corresponding to the current traction control unit is higher than a fourth preset numerical value in a fourth preset time.
4. The method of braking a vehicle under coast according to claim 1 further comprising:
the brake control unit sends an electric brake reduction signal to the traction control unit, wherein the electric brake reduction signal comprises the maximum value of the electric brake reduction value;
the traction control unit reduces the electric braking force of the vehicle according to the electric brake reduction signal.
5. The method of braking a vehicle under coast according to claim 1 further comprising:
the brake control unit controls the anti-skid valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft to adjust the pressure of the brake cylinder corresponding to each shaft, and air brake force is reduced.
6. The method for braking a vehicle under coasting according to claim 5, wherein the brake control unit controls the antiskid valve of each axle according to the air brake reduction time corresponding to the current coasting state of each axle, specifically comprising:
and the brake control unit controls the pressure retaining valve and the exhaust valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft.
7. The brake system under the condition of vehicle sliding is characterized by comprising a brake control unit and a traction control unit;
the brake control unit includes:
a calculation module for calculating a reference speed of the vehicle and an axle deceleration of each axle from the axle speed of each axle;
a coasting state module for determining a current coasting state of each axle based on a difference between the reference speed and an axle speed of each axle and the axle deceleration of each axle;
the judging module is used for judging whether the vehicle meets an electric brake cut-off condition or not according to the vehicle speed, the reference speed, the axle speed, the difference value between the reference speed and the axle speed of each axle and the maximum value of an electric brake reduction value corresponding to the current sliding state of each axle;
the sending module is used for sending an electric brake cutting signal to the traction control unit;
the traction control unit is used for cutting off the electric brake according to the electric brake cutting signal;
the coasting state module is specifically configured to:
determining a current coasting state of each axle based on a difference between a reference speed and an axle speed of each axle and the axle deceleration of each axle;
determining the current sliding state of each axis through a matrix mapping table; the matrix mapping table is a sliding state matrix table with i x j levels, and each level corresponds to a sliding state one by one.
8. The vehicle under-coast brake system according to claim 7,
the brake control unit is further configured to: sending an electric brake reduction signal to the traction control unit, the electric brake reduction signal including a maximum value of the electric brake reduction value;
the traction control unit is further configured to: reducing the electric braking force of the vehicle according to the electric brake reduction signal.
9. The vehicle under-coast brake system according to claim 7, wherein the brake control unit further comprises an air brake reduction module;
the air brake reduction module is to: and controlling the anti-skid valve of each shaft according to the air brake reduction time corresponding to the current sliding state of each shaft to adjust the pressure of the brake cylinder corresponding to each shaft so as to reduce the air brake force.
10. The vehicle under-coast brake system according to claim 9, wherein the air brake reduction module is specifically configured to:
and controlling the pressure retaining valve and the exhaust valve of each shaft according to the air braking reduction time corresponding to the current sliding state of each shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710545449.XA CN107351824B (en) | 2017-07-06 | 2017-07-06 | Braking method and system for vehicle under sliding |
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| CN112440953B (en) | 2019-08-30 | 2022-04-15 | 比亚迪股份有限公司 | Vehicle and braking method and device thereof |
| CN112440957B (en) | 2019-08-30 | 2022-07-15 | 比亚迪股份有限公司 | Vehicle and braking method and device thereof |
| CN112440954B (en) * | 2019-08-30 | 2022-07-15 | 比亚迪股份有限公司 | Vehicle and braking method and device thereof |
| CN110531682B (en) * | 2019-09-19 | 2020-09-29 | 中车青岛四方车辆研究所有限公司 | General traction control platform and method for railway vehicle |
| CN111038462B (en) * | 2020-01-02 | 2021-12-24 | 中车青岛四方机车车辆股份有限公司 | Brake control method and system for railway vehicle |
| CN113071457B (en) * | 2020-01-03 | 2022-03-01 | 中车唐山机车车辆有限公司 | Train antiskid control method and antiskid control device |
| CN111380708A (en) * | 2020-05-11 | 2020-07-07 | 中车青岛四方机车车辆股份有限公司 | Train axle locking fault diagnosis method and train axle locking fault diagnosis system |
| CN111959467B (en) * | 2020-08-20 | 2023-05-05 | 南京中车浦镇海泰制动设备有限公司 | Rail vehicle electromechanical braking anti-skid control system and method |
| CN111959468B (en) * | 2020-08-20 | 2023-09-22 | 南京中车浦镇海泰制动设备有限公司 | Rail vehicle electromechanical braking force control method |
| CN113665544B (en) * | 2021-09-08 | 2022-06-10 | 中国铁道科学研究院集团有限公司 | Method and device for optimizing emergency braking deceleration of railway vehicle |
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| CN103381798B (en) * | 2012-05-02 | 2015-07-29 | 中国铁道科学研究院机车车辆研究所 | The electro-pneumatic brake control device of rail traffic vehicles and control method thereof |
| CN102941848B (en) * | 2012-11-14 | 2015-09-09 | 北京纵横机电技术开发公司 | For the method and apparatus of rail vehicle braking system service braking |
| CN104071143B (en) * | 2014-07-10 | 2016-03-16 | 南京浦镇海泰制动设备有限公司 | A kind of rail vehicle braking control unit |
| CN106364333B (en) * | 2016-10-12 | 2018-12-11 | 南京中车浦镇海泰制动设备有限公司 | The empty composite braking control method of brake control and its electricity of rail traffic vehicles |
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