CN111661078A - Sand spreading control system and sand spreading control method for railway passenger car - Google Patents
Sand spreading control system and sand spreading control method for railway passenger car Download PDFInfo
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- CN111661078A CN111661078A CN202010679159.6A CN202010679159A CN111661078A CN 111661078 A CN111661078 A CN 111661078A CN 202010679159 A CN202010679159 A CN 202010679159A CN 111661078 A CN111661078 A CN 111661078A
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- 239000004576 sand Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000007480 spreading Effects 0.000 title claims description 8
- 238000001035 drying Methods 0.000 claims description 47
- 238000012360 testing method Methods 0.000 claims description 44
- 244000035744 Hura crepitans Species 0.000 claims description 17
- 230000004913 activation Effects 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 11
- 238000005488 sandblasting Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011990 functional testing Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C15/00—Maintaining or augmenting the starting or braking power by auxiliary devices and measures; Preventing wheel slippage; Controlling distribution of tractive effort between driving wheels
- B61C15/08—Preventing wheel slippage
- B61C15/10—Preventing wheel slippage by depositing sand or like friction increasing materials
- B61C15/107—Preventing wheel slippage by depositing sand or like friction increasing materials with electrically or electromagnetically controlled sanding equipment
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Abstract
The invention discloses a sanding control system and a sanding control method of a railway passenger car, which solve the problems that the sanding control mode of the existing railway passenger car adopts rated air pressure to carry out sanding control, the quantity of sand sprayed between wheel tracks cannot be accurately controlled, so that the sanding amount is too much when the train is at low speed, and waste is caused; the sanding controller and the sanding control module are integrated in a brake control module of the brake system, and the brake control module is hoisted on a vehicle body bottom frame through a hoisting frame and a fastening piece; the sanding device is respectively connected with the sanding controller and the sanding control module through a gas circuit pipeline and an electric control cable; the sanding controller is connected with the sanding control module through an electric control cable. The sanding controller activates sanding solenoid valves of corresponding axles according to the speed and the running direction of the train to perform sanding, and controls the sanding air pressure according to a sanding efficiency control curve in real time to meet the requirement of balanced sanding amount at different speeds.
Description
Technical Field
The invention relates to a sanding control system and a sanding control method for a railway passenger car.
Background
In the process of traction or braking of the railway passenger car, idle running or sliding working conditions often occur due to unfavorable adhesion conditions, in order to prevent wheels from being scratched during idle running or sliding, a sanding system is equipped for some types of railway vehicles (such as high-speed motor train units, intercity motor train units, urban railway vehicles and the like), and a sanding control system can control a sanding device to sand on a contact surface of a wheel rail, so that the adhesion coefficient between the wheel rail is improved, and the probability of idle running and sliding is reduced and eliminated.
The prior sanding control mode of domestic railway carriages adopts rated pressure to carry out sanding control, and sanding time control is mostly manually operated, and the quantity of sand sprayed on a track cannot be controlled due to the continuous change of human factors and train speed, so that the sanding amount is too much when the train is at low speed, and waste is caused; the amount of sand applied at high speed is insufficient and the adhesion cannot be effectively improved. Simultaneously, domestic railway carriage is to sanding the functional test of control unit need carry out full train sanding unit functional test through activating the inside sanding button of train cab, need in the car during the test to go on with the car tester cooperation, can not realize single testing sanding the control unit, extravagant manpower and inconvenient.
Disclosure of Invention
The invention provides a sanding control system and a sanding control method of a railway passenger car, aiming at solving the problems that the sanding control mode of the existing railway passenger car adopts rated air pressure to carry out sanding control, the quantity of sand sprayed between wheel tracks cannot be accurately controlled, so that the sanding quantity is too much when the train is at low speed, waste is caused, the sanding quantity is insufficient at high speed, and adhesion cannot be effectively improved, and solving the problems that when the function test of a sanding unit is carried out by a sanding control system of the existing railway passenger car, the sanding control system needs to be carried out by matching in the car with a tester under the car, the sanding control unit cannot be tested by a single person, and manpower is wasted and inconvenient.
A sanding control system of a railway passenger car comprises a sanding controller, a sanding control module and a sanding device; the sanding controller and the sanding control module are integrated in a brake control module of the brake system, and the brake control module is hoisted on a vehicle body bottom frame through a hoisting frame and a fastening piece; the sanding device is respectively connected with the sanding controller and the sanding control module through a gas circuit pipeline and an electric control cable; the sanding controller is connected with the sanding control module through an electric control cable.
The sanding controller activates a sanding electromagnetic valve of a corresponding axle according to the speed and the running direction of the train to perform sanding, controls the sanding air pressure in real time according to a sanding efficiency control curve to meet the requirement of balanced sanding amount at different speeds, and activates an automatic sanding control function according to the sliding of the wheel detected by a braking system or the idle rotation of the wheel detected by a traction system; the sanding controller activates the sanding control function of the vehicle according to a sanding request command signal sent by a train control system or a sanding test button activation signal of a sanding device;
the sanding control module comprises a charged contact cut-off cock, a sanding wind pressure control unit, a second-shaft sanding electromagnetic valve, a third-shaft sanding electromagnetic valve, a sanding drying electromagnetic valve and a sanding throttle valve;
the sanding wind pressure control unit comprises an air charging electromagnetic valve, an air exhaust electromagnetic valve, a pressure sensor, a relay valve and a buffer air cylinder;
the input end of the electrified contact cutoff cock is connected with a pressure pipeline, the output end of the electrified contact cutoff cock is connected with the input end of an air charging electromagnetic valve and an air source air pressure port R of a relay valve, the output end of the air charging electromagnetic valve is simultaneously connected with an air exhaust electromagnetic valve and a buffer air cylinder through the pressure pipeline, the output end of the buffer air cylinder is connected with a pre-control air pressure port Cv and a pressure sensor of the relay valve through the pressure pipeline, and an air pressure output port C of the relay valve is connected with a second-shaft sanding electromagnetic valve, a third-shaft sanding electromagnetic valve and a sanding drying electromagnetic valve through the pressure pipeline;
when the sanding controller controls second axle sanding, the air charging electromagnetic valve and the air discharging electromagnetic valve are simultaneously controlled according to the train speed, the closed-loop control is realized by comparing the air pressure value of the pre-control air pressure port Cv of the relay valve actually detected by the pressure sensor with the target value of the pre-control air pressure value Cv, and the actual air pressure value of sanding is obtained at the air pressure output port C required by sanding of the relay valve through adjusting the air source pressure of the air source air pressure port R; meanwhile, the sanding controller controls the opening of the two-axis sanding electromagnetic valve, so that the actual air pressure value of sanding enters the sanding device of the second shaft through a connecting pipeline of a sanding interface S1 of the sanding control module, and the second shaft is sanded;
when the sanding controller controls sanding of the third shaft, the sanding controller controls the sanding solenoid valve of the third shaft to realize that the sanding interface S2 of the sanding control module is communicated with the air pressure of the air pressure output port C required by sanding of the relay valve, so that the actual air pressure value of sanding enters the sanding device of the third shaft through the connecting pipeline of the sanding interface S2 of the sanding control module to realize sanding of the third shaft.
When the train does not need sanding, the sanding controller controls a second-shaft or third-shaft sanding drying electromagnetic valve through a sanding drying air control signal, so that a sanding drying air blowing interface D1 or D2 of the sanding control module is communicated with the air pressure of an air pressure output port C required by sanding of the relay valve, and enters a sanding device of the second-shaft or third-shaft through a connecting pipeline of a sanding drying air blowing interface D1 or D2 of the sanding control module, and alternating drying air blowing control of the second-shaft or third-shaft is realized.
A sanding control method for a railway passenger car comprises a sanding drying control method, a sanding function test control method and a sanding control method. The sanding control method comprises the following specific steps:
firstly, the sanding controller receives a train running direction and a vehicle speed V in real time, a sanding request instruction signal sent by a train control system or a wheel slide state indication signal detected by a traction control system and sent by a wheel idle or a wheel slide state detection control system, a total wind pressure P of an air supply system and a sanding test button activation state signal; and the sanding test button is not activated.
Step two, judging whether the charged contact cut-off cock is opened or not, and if so, executing step three; if not, returning to execute the first step;
step three, judging whether the following conditions are met simultaneously, namely:
vehicle speed V > minimum vehicle speed Vmin,
the total wind pressure P of the air supply system is greater than the minimum value Pmin of the compressed air wind pressure when the air supply system assists in sand blasting,
the sanding controller receives a sanding request command signal sent by a train control system or detects by a traction control system and sends a wheel idle or a wheel sliding state indication signal detected by a brake control system and a sanding test button is not activated, if so, the fourth step is executed; if not, returning to execute the first step;
step four, when V is more than V1 and less than or equal to V2, the sanding amount Qsand is Q (V), and the Q (V) is the gradually increased sanding amount which is in direct proportion to the speed of the train and synchronously changes along with the speed increase; v1 and V2 are respectively the change points of the sanding amount mode curve;
when V is less than or equal to V1, the sanding amount Qsand is Q1; q1 is a preset constant minimum constant for the sanding amount when the train runs at low speed;
when V is more than V2, the sanding amount Qsand is Q2; q2 is the maximum constant of the sand blasting amount which can be achieved when the train is at a preset high speed;
step five, calculating a wind pressure value Psand required by a sanding unit in a single sanding device according to the sanding amount Qsand obtained in the step four, and calculating a wind pressure target value of a pre-control wind pressure port Cv of a relay valve according to the wind pressure value Psand, wherein the Cv is F (Psand);
sixthly, the sanding controller 1 controls an air charging electromagnetic valve and an air exhausting electromagnetic valve in a closed loop mode according to sanding pre-control pressure signals fed back by a pressure sensor to enable pre-control air pressure Cv to reach a control air pressure target value F (Psand);
step seven, judging whether the train running direction is from the second axle to the third axle, if so, outputting a second axle sanding control signal by the sanding controller, controlling a second axle sanding electromagnetic valve, and sanding the second axle; if not, the sanding controller 1 outputs a third shaft sanding control signal to control a third shaft sanding electromagnetic valve to sand the third shaft.
The invention has the beneficial effects that: the automatic sanding is carried out by adopting a sanding control mode with automatically variable sanding efficiency when a train idles or slides under the unfavorable condition of adhesion of the wheel rails, so that the constant sanding amount among the wheel rails is ensured, the adhesion efficiency among the wheel rails is improved, and the wheel set scratching fault is avoided.
The invention adopts a sanding control mode with automatically variable sanding efficiency to automatically sand, ensures relatively constant sanding amount between the wheel rails, improves the efficiency of improving adhesion between the wheel rails, avoids wheel set scratching faults, and effectively solves the problems that the sanding amount is too much at low speed of a train due to constant sanding pressure, the waste is caused, the sanding amount is not enough at high speed, and the adhesion cannot be effectively improved.
When the sanding function test is carried out in daily maintenance, the function test of a single axle sanding control unit can be realized, the maintenance time is shortened, the labor is saved, and the problem that a single person cannot independently complete the test of the sanding control system under the vehicle is solved.
Drawings
FIG. 1 is a schematic diagram of a sanding control system for a railway passenger car according to the present invention;
fig. 2 is a schematic block diagram of a sanding control system of a railway passenger car according to the present invention.
FIG. 3 is a curve diagram of the sand discharge per minute varying with the train speed in the sand discharge control method for a railway passenger car according to the present invention;
FIG. 4 is a flow chart of a sanding control method for a railway car according to the present invention;
Detailed Description
First embodiment, the present embodiment is described with reference to fig. 1 and 2, and a sanding control system for a railway vehicle includes a sanding controller 1, a sanding control module 2, a sanding device 3, and related pipelines and hard lines.
The sanding controller 1 belongs to an electric microcomputer control part of a sanding system, is a control computer of the sanding control system, performs microcomputer control on the sanding system according to control condition information and feedback signals, outputs corresponding control signals to activate electromagnetic valves with different functions, and realizes sanding drying control, sanding function test control and sanding control.
The sanding control module 2 belongs to a gas path control part of a sanding control system, belongs to a gas path control execution part and is controlled by a sanding controller 1,
the sanding controller 1 and the sanding control module 2 are integrated in a brake control module of the brake system, and the sanding device 3 is connected with the sanding controller 1 and the sanding control module 2 through pipelines and hard lines. And the braking system control module integrating the sanding controller 1 and the sanding control module 2 is hoisted on the vehicle body underframe through a hoisting frame and corresponding fasteners. The sanding device 3 is respectively connected with the sanding controller 1 and the sanding control module 2 through a gas circuit pipeline and an electric control cable; the sanding controller 1 is connected with the sanding control module 2 through an electric control cable.
The sanding controller 1 activates sanding electromagnetic valves of corresponding axles according to the speed and the running direction of the train to perform sanding, controls the sanding air pressure in real time according to a sanding efficiency control curve to meet the requirement of balanced sanding amount at different speeds, enables the sanding amount to effectively improve adhesion between wheel rails, and activates automatic sanding when the vehicle detects sliding or idling.
The sanding control module 2 mainly comprises a charged contact cut-off cock 4, a sanding wind pressure control unit 5, a two-axis sanding electromagnetic valve 6, a three-axis sanding electromagnetic valve 7, a sanding drying electromagnetic valve 8 and a sanding throttle valve 9;
the sanding wind pressure control unit 5 is a core component of a gas path control part of a sanding control system and comprises an air charging electromagnetic valve 5-1, an air exhaust electromagnetic valve 5-2, a pressure sensor 5-3, a relay valve 5-4 and a buffer air cylinder 5-5.
In this embodiment, the charged contact cutoff cock 4 is used for isolating the sanding control system, and when the charged contact cutoff cock is isolated, the sanding controller 1 diagnoses a cock isolation state feedback signal, does not perform any function, and simultaneously cuts off the air source of the sanding system. The input end of the electrified contact cutoff cock 4 is connected with a pressure pipeline, the output end of the electrified contact cutoff cock 4 is connected with the input end of an air charging electromagnetic valve 5-1 and an air source air pressure port R of a relay valve 5-4, the output end of the air charging electromagnetic valve 5-1 is simultaneously connected with an air exhaust electromagnetic valve 5-2 and a buffer air cylinder 5-5 through the pressure pipeline, the output end of the buffer air cylinder 5-5 is connected with a pre-control air pressure port Cv of the relay valve 5-4 and a pressure sensor 5-3 through the pressure pipeline, and an air pressure output port C of the relay valve 5-4 is connected with a second shaft sanding electromagnetic valve 6, a third shaft sanding electromagnetic valve 7 and a sanding drying electromagnetic valve 8 through the pressure pipeline; the sanding throttle valve 9 is correspondingly connected with the two-axis sanding electromagnetic valve 6 and the three-axis sanding electromagnetic valve 7 and used for limiting the flow speed and flow of sanding air pressure.
The air charging electromagnetic valve 5-1 and the air exhaust electromagnetic valve 5-2 are controlled by a control signal of the sanding controller 1, and are matched with the pre-control air pressure port Cv pressure of the relay valve 5-4 to control the Cv pressure to reach a control target value. The air charging solenoid valve 5-1 only has the functions of connection and disconnection, and the air exhaust solenoid valve 5-2 only has the functions of pressure maintaining and air exhaust; when the air charging electromagnetic valve 5-1 and the air exhaust electromagnetic valve 5-2 are simultaneously electrified, the air source enters the Cv pressure volume; when the air charging electromagnetic valve 5-1 and the air exhaust electromagnetic valve 5-2 are both de-energized, the Cv air pressure is exhausted from the air exhaust electromagnetic valve 5-2; when the air charging electromagnetic valve 5-1 is de-energized and the air exhaust electromagnetic valve 5-2 is energized, the Cv volume air pressure is kept.
The pressure sensor 5-3 is used for detecting the controlled Cv pressure and feeding back a signal to the sanding controller 1, the sanding controller 1 compares the feedback signal of the Cv pressure with a target value, and when the deviation range is exceeded, the air charging electromagnetic valve 5-1 and the air exhaust electromagnetic valve 5-2 are continuously controlled to enable the Cv pressure to be infinitely close to the target value, so that closed-loop control is realized.
The relay valve 5-4 is a linear control flow amplifying valve, and controls the flow and the air pressure from an air source air pressure port R to a sanding air pressure output port C according to the pressure value of a pre-control air pressure port Cv, wherein C is a.Cv; a is the magnification, the pressure of an air source air pressure port R comes from an air source P, a sanding air pressure output port C is the air pressure required by the participation of drying and sanding, and Cv is the pre-control air pressure; and O is an air outlet communicated with the atmosphere.
The buffer air cylinder 5-5 is used for increasing the volume of the pre-control Cv pressure in a limited way, so that the air path control is more accurate and effective.
The second shaft sanding electromagnetic valve 6, the third shaft sanding electromagnetic valve 7 and the second or third shaft sanding drying electromagnetic valve 8 are electromagnetic valves with wind sources participating in opening control, when the corresponding electromagnetic valves are powered off, 3 ports of the electromagnetic valves are communicated with 1 port, and 4 ports and 2 ports of the electromagnetic valves are cut off; when the corresponding electromagnetic valve is electrified, the 3 ports of the electromagnetic valve are communicated with the 2 ports, the 4 ports of the air source wind pressure participates in the opening of the 3 ports and the 2 ports, and the 1 port is cut off.
When the sanding controller 1 activates the second-shaft sanding electromagnetic valve 6 through the second-shaft sanding control signal, the sanding interface S1 of the sanding control module 2 is communicated with the air pressure of the sanding air pressure output port C of the relay valve 5-4 to realize second-shaft sanding; when the sanding controller 1 activates the third-axis sanding electromagnetic valve 7 through a third-axis sanding control signal, the sanding interface S2 of the sanding control module 2 is communicated with the air pressure of the sanding air pressure output port C of the relay valve 5-4 to realize third-axis sanding; when the sanding controller 1 activates the second-axis or third-axis sanding drying electromagnetic valve 8 through a sanding drying air control signal, the sanding drying air blowing interface D1 of the sanding control module 2 is communicated with the air pressure of the sanding air pressure output port C of the relay valve 5-4, so that sanding drying air blowing of the second axis is realized; when the sanding controller 1 does not activate the second-axis or third-axis sanding drying electromagnetic valve 8 through a sanding drying air control signal, the sanding drying air blowing interface D2 of the sanding control module 2 is communicated with the air pressure of the sanding air pressure output port C of the relay valve 5-4, and sanding drying air blowing of the third axis is realized.
In the embodiment, the sanding device 3 mainly comprises a test button 3-1, a sanding unit 3-2, a sand box 3-3, a sand position sensor 3-4 and a sanding nozzle 3-5; the sand box 3-3 is connected with the sanding unit 3-2, the sanding unit 3-2 is connected with the sanding nozzle 3-5, the sand box 3-3 is hung on a vehicle body bottom frame close to a bogie axle through a fastening piece, the sanding nozzle 3-5 is fixed on a wheel pair framework of the bogie, the sanding nozzle is aligned to a wheel rail contact surface, and sand is accurately sprayed at the wheel rail contact position during sanding. The test button 3-1 is arranged outside the sand box 3-3, the sand position sensor 3-4 is arranged in the sand box 3-3, the sand position indicator is arranged on the sand box 3-3, and the sand position indicator indicates according to the sand position detected by the sand position sensor 3-4.
In the embodiment, the sanding unit 3-2 is used for enabling the sand of the sand box 3-3 to be sprayed to the contact surface of the wheel rail through the sanding nozzle 3-5 by the differential pressure principle, the sanding nozzle 3-5 is arranged at the wheel set and is aligned with the wheel and the rail surface, and a heating rod is arranged in the sanding unit to prevent the sanding nozzle from being frozen. Meanwhile, the sanding drying air is blown into the sand box to enable the sand in the sand box to be in a flowing sand state, the sand is kept dry, and when the temperature is low, the heating rod is arranged in the sanding unit to heat the drying air, so that the sand is prevented from being frozen and agglomerated in winter. The heating rod is used for heating sand in the sand box, and meanwhile, sand blasting control is realized by using the sand blasting air pressure from the sand blasting control module 2; the sand boxes 3-3 are filled with sand for sanding in an amount that meets the sanding requirements of the vehicle operation. And a sand level indicator and a sand level sensor 3-4 are arranged at the same time, the sanding function is tested through the test button 3-1, the test button on the sanding device is pressed, and the sanding controller 1 can activate the sanding solenoid valve of the corresponding shaft and the air charging and exhausting solenoid valves to carry out sanding control according to a button feedback signal. For example, when any sanding test button on axis two is pressed, sanding controller 1 will accept the test command and activate axis two for sanding.
In the sanding control system of the embodiment, when the sanding controller 1 needs to activate second-axis sanding, the pre-control air pressure required by the pre-control air pressure port Cv of the relay valve 5-4 is controlled by simultaneously controlling the air charging electromagnetic valve 5-1 and the air discharging electromagnetic valve 5-2 according to the vehicle speed and forming closed-loop control according to the pressure detected by the pressure sensor 5-3, and the linear control transformation of the relay valve is performed according to the air pressure value of the pre-control air pressure port Cv of the relay valve 5-4, so that the air pressure of an air source enters the air pressure of the sanding air pressure output port C of the relay valve from the air source air pressure port R of the relay valve 5-4 to obtain the required actual sanding air pressure value, and meanwhile, the sanding controller 1 activates the second-axis sanding electromagnetic valve 6 to enable the sanding air pressure to enter the sanding device through a pipeline to realize sand blasting control; in a similar way, when the third shaft needs sanding, the corresponding third shaft sanding electromagnetic valve 7 is activated to control. When the train does not need to be sanded, the sanding controller 1 can properly activate the sanding wind pressure control unit and the sanding drying electromagnetic valve 8 to perform alternate drying and blowing control on the second shaft and the third shaft according to the weather temperature and the total wind pressure condition, so that the condition that the sand is frozen due to humidity and coldness is prevented.
The sanding control system of the embodiment is used for improving the adhesion of the wheel and the rail, preventing the wheel from idling and sliding and playing an important role in the traction and braking processes of the vehicle.
The second embodiment is described with reference to fig. 3 and 4, and the second embodiment is a sanding control method of a sanding control system of a railway passenger car according to the first embodiment, and the method includes a sanding drying control method, a sanding function test control method, and a sanding control method.
The sanding control method comprises the following specific steps:
firstly, the sanding controller 1 receives a train running direction and a vehicle speed V in real time, a sanding request instruction signal sent by a train control system or a wheel slide state indication signal detected by a traction control system and sent by a wheel idle or a wheel slide state detection control system, a total wind pressure P of an air supply system and a sanding test button activation state signal; and the sanding test button is not activated.
Step two, judging whether the charged contact cutoff cock 4 is opened or not, and if so, executing step three; if not, returning to execute the first step;
step three, judging whether the following conditions are met simultaneously, namely:
vehicle speed V > minimum vehicle speed Vmin,
the total wind pressure P of the air supply system is greater than the minimum value Pmin of the compressed air wind pressure when the air supply system assists in sand blasting,
the sanding controller 1 receives a sanding request command signal sent by a train control system or detects by a traction control system and sends a wheel idle or a wheel sliding state indication signal detected by a brake control system and a sanding test button is not activated, if so, the fourth step is executed; if not, returning to execute the first step;
step four, when V is more than V1 and less than or equal to V2, the sanding amount Qsand is Q (V), and the Q (V) is the gradually increased sanding amount which is in direct proportion to the speed of the train and synchronously changes along with the speed increase; v1 and V2 are respectively the change points of the sanding amount mode curve;
when V is less than or equal to V1, the sanding amount Qsand is Q1; q1 is a preset constant minimum constant for the sanding amount when the train runs at low speed;
when V is more than V2, the sanding amount Qsand is Q2; q2 is the maximum constant of the sand blasting amount which can be achieved when the train is at a preset high speed;
step five, calculating a wind pressure value Psand required by a sanding unit 3-2 in a single sanding device 3 according to the sanding amount Qsand obtained in the step four, and calculating a wind pressure target value of a pre-control wind pressure port Cv of a relay valve 5-4 according to the wind pressure value Psand, wherein the Cv is F (Psand);
sixthly, the sanding controller 1 controls an air charging electromagnetic valve 5-1 and an air exhausting electromagnetic valve 5-2 in a closed loop mode according to sanding pre-control pressure signals fed back by a pressure sensor 5-3 to enable pre-control air pressure Cv to reach a control air pressure target value F (Psand);
step seven, judging whether the train running direction is from the second axle to the third axle, if so, outputting a second axle sanding control signal by the sanding controller 1, controlling a second axle sanding electromagnetic valve 6, and sanding the second axle; if not, the sanding controller 1 outputs a third shaft sanding control signal to control the third shaft sanding electromagnetic valve 7 to sand the third shaft.
In this embodiment, the concrete process of the sanding drying control method is as follows:
step A, judging whether the following conditions are completely met, namely:
the total wind pressure P of the air supply system is greater than the minimum wind pressure Pmin1 of the dry wind,
the sanding controller 1 does not receive a sanding request command signal sent by the train control system,
the sanding controller 1 does not receive the wheel sliding condition detected by a braking system or the wheel idle signal detected by a traction system, and a sanding test button is not activated; if yes, executing step B; if not, returning to execute the first step;
b, calculating a wind pressure target value of a pre-control wind pressure port Cv of the relay valve 5-4 according to sanding drying wind pressure Pdry, wherein Cv is F (Pdry);
step C, the sanding controller 1 controls an air charging electromagnetic valve 5-1 and an air exhausting electromagnetic valve 5-2 in a closed loop mode according to a feedback signal of a pressure sensor 5-3 to enable pre-control air pressure Cv to reach a control drying air pressure target value F (Pdry);
and D, outputting a sanding drying air control signal by the sanding controller 1, controlling a second-shaft or third-shaft sanding drying electromagnetic valve 8, and realizing alternate drying control of the second shaft and the third shaft, wherein the period time Theat is 30 s-120 s.
In this embodiment, the specific process of the sanding function test control method is as follows:
step a, judging whether the following conditions are completely met, namely:
the vehicle speed V is 0km/h, the vehicle is in a stationary state,
the total wind pressure P of the air supply system is greater than the minimum test wind pressure Pmin2,
the sanding controller 1 does not receive a sanding request command signal sent by a train control system;
the sanding controller 1 does not receive the wheel sliding condition detected by a braking system or the wheel idle signal detected by a traction system and the sanding test button activation signal; if yes, executing step b; if not, returning to execute the first step;
b, calculating a test wind pressure value Ptest required by a sanding unit 3-2 in the sanding device 3 according to a set test sanding amount Qtest, and calculating a wind pressure target value of a pre-control wind pressure port Cv of a relay valve 5-4, wherein the Cv is F (Ptest);
c, the sanding controller 1 controls the air charging electromagnetic valve 5-1 and the air exhaust electromagnetic valve 5-2 in a closed loop mode according to a feedback signal of the pressure sensor 5-3 to enable the pre-control air pressure Cv to reach a test target value F (Ptest);
d, judging whether a test button of any sanding unit 3-2 of the second shaft is activated or not, if so, outputting a second shaft sanding electromagnetic valve activation signal to control a second shaft sanding electromagnetic valve 6 to sand the second shaft, wherein the duration Ttest is 10-15 s; if not, outputting a third shaft sanding electromagnetic valve activation signal to control a third shaft sanding electromagnetic valve 7 to sand a third shaft, wherein the duration Ttest is 10s to 15 s.
Claims (8)
1. A sanding control system of a railway passenger car comprises a sanding controller (1), a sanding control module (2) and a sanding device (3); the method is characterized in that: the sanding controller (1) and the sanding control module (2) are integrated in a brake control module of the brake system, and the brake control module is hoisted on a vehicle body bottom frame through a hoisting frame and a fastening piece; the sanding device (3) is respectively connected with the sanding controller (1) and the sanding control module (2) through a gas circuit pipeline and an electric control cable; the sanding controller (1) is connected with the sanding control module (2) through an electric control cable;
the sanding control module (2) comprises an electrified contact cut-off cock (4), a sanding wind pressure control unit (5), a second-shaft sanding electromagnetic valve (6), a third-shaft sanding electromagnetic valve (7), a sanding drying electromagnetic valve (8) and a sanding throttle valve (9);
the sanding wind pressure control unit (5) comprises an air charging electromagnetic valve (5-1), an air exhaust electromagnetic valve (5-2), a pressure sensor (5-3), a relay valve (5-4) and a buffer air cylinder (5-5);
the input end of the electrified contact cutoff cock (4) is connected with a pressure pipeline, the output end of the electrified contact cutoff cock is connected with the input end of an air charging electromagnetic valve (5-1) and an air source air pressure port R of a relay valve (5-4), the output end of the air charging electromagnetic valve (5-1) is simultaneously connected with an air exhaust electromagnetic valve (5-2) and a buffer air cylinder (5-5) through a pressure pipeline, the output end of the buffer air cylinder (5-5) is connected with a pre-control air pressure port Cv of the relay valve (5-4) and a pressure sensor (5-3) through the pressure pipeline, and an air pressure output port C of the relay valve (5-4) is connected with a second-shaft sanding electromagnetic valve (6), a third-shaft sanding electromagnetic valve (7) and a sanding drying electromagnetic valve (8) through the pressure pipeline;
the sanding controller (1) activates sanding electromagnetic valves of corresponding axles according to the speed and the running direction of the train to perform sanding, controls the sanding air pressure in real time according to a sanding efficiency control curve to meet the requirement of balanced sanding amount at different speeds, and activates an automatic sanding control function according to the condition that a wheel slides when detected by a braking system or the condition that the wheel idles when detected by a traction system; the sanding controller (1) activates the sanding control function of the vehicle according to a sanding request command signal sent by a train control system or a sanding test button activation signal of the sanding device (3);
when the sanding controller (1) controls second-axle sanding, the air charging electromagnetic valve (5-1) and the air discharging electromagnetic valve (5-2) are simultaneously controlled according to the train speed, the air pressure value of the pre-control air pressure port Cv of the relay valve (5-4) actually detected by the pressure sensor (5-3) is compared with the target value of the pre-control air pressure value Cv to realize closed-loop control, and the actual air pressure value of sanding is obtained at the air pressure output port C required by sanding of the relay valve (5-4) through adjusting the air source pressure of the air source air pressure port R; meanwhile, the sanding controller (1) controls the opening of the two-axis sanding electromagnetic valve (6) to enable the actual air pressure value of sanding to enter the sanding device of the second shaft through a connecting pipeline of a sanding interface S1 of the sanding control module (2), so that the second shaft is sanded;
when the sanding controller (1) controls sanding of the third shaft, the sanding controller (1) controls the sanding electromagnetic valve (7) of the third shaft to achieve that the sanding interface S2 of the sanding control module (2) is communicated with the air pressure of the air pressure output port C required by sanding of the relay valve (5-4), so that the actual air pressure value of sanding enters the sanding device of the third shaft through the connecting pipeline of the sanding interface S2 of the sanding control module (2), and sanding of the third shaft is achieved.
2. A sanding control system for a railway car as claimed in claim 1, wherein: when the train does not need sanding, the sanding controller (1) controls a second-shaft or third-shaft sanding drying electromagnetic valve (8) through sanding drying air control signals, so that a sanding drying air blowing interface D1 or a D2 of the sanding control module (2) is communicated with air pressure of a required air pressure outlet C for sanding of the relay valve (5-4), and enters a sanding device of the second shaft or the third shaft through a connecting pipeline of a sanding drying air blowing interface D1 or a D2 of the sanding control module (2), and alternating drying air blowing control of the second shaft or the third shaft is achieved.
3. A sanding control system for a railway car as claimed in claim 1, wherein: the sanding device (3) comprises a test button (3-1), a sanding unit (3-2), a sand box (3-3), a sand position sensor (3-4) and a sanding nozzle (3-5); the sand box (3-3) is connected with the sand spreading unit (3-2), the sand spreading unit (3-2) is connected with the sand spreading nozzle (3-5), the sand box (3-3) is hung on a vehicle body bottom frame close to a bogie axle through a fastening piece, the sand spreading nozzle (3-5) is fixed on a wheel pair framework of the bogie, a test button (3-1) is arranged outside the sand box (3-3), a sand level sensor (3-4) is arranged in the sand box (3-3), a sand level indicator is arranged on the sand box (3-3), and the sand level indicator indicates according to a sand level detected by the sand level sensor (3-4).
4. The sanding control method of a sanding control system for a railway passenger car according to claim 1, the method comprising a sanding drying control method, a sanding function test control method, and a sanding control method; the method is characterized in that: the sanding control method comprises the following specific steps:
the method comprises the following steps that firstly, a sanding controller (1) receives a train running direction and a vehicle speed V, a sanding request instruction signal, a wheel idle or wheel sliding state indication signal, a total wind pressure P of an air supply system and a sanding test button activation state signal in real time;
step two, judging whether the charged contact cut-off cock (4) is opened or not, and if so, executing step three; if not, returning to execute the first step;
step three, judging whether the following conditions are met simultaneously, namely:
vehicle speed V > minimum vehicle speed Vmin,
the total wind pressure P of the air supply system is greater than the minimum value Pmin of the compressed air wind pressure when the air supply system assists in sand blasting,
the sanding controller (1) receives a sanding request command signal sent by a train control system or detects by a traction control system and sends a wheel idle or a wheel sliding state indication signal detected by a brake control system and a sanding test button is not activated, if so, the fourth step is executed; if not, returning to execute the first step;
step four, when V is more than V1 and less than or equal to V2, the sanding amount Qsand is Q (V), and the Q (V) is the gradually increased sanding amount which is in direct proportion to the speed of the train and synchronously changes along with the speed increase; v1 and V2 are respectively the change points of the sanding amount mode curve;
when V is less than or equal to V1, the sanding amount Qsand is Q1; q1 is a preset constant minimum constant for the sanding amount when the train runs at low speed;
when V is more than V2, the sanding amount Qsand is Q2; q2 is the maximum constant of the sand blasting amount which can be achieved when the train is at a preset high speed;
step five, calculating a wind pressure value Psand required by a sanding unit (3-2) in a single sanding device (3) according to the sanding amount Qsand obtained in the step four, and calculating a wind pressure target value of a pre-control wind pressure port Cv of a relay valve (5-4) according to the wind pressure value Psand, wherein the Cv is F (Psand);
sixthly, the sanding controller (1) controls an air charging electromagnetic valve (5-1) and an air exhausting electromagnetic valve (5-2) in a closed loop mode according to a sanding pre-control pressure signal fed back by a pressure sensor (5-3) to enable a pre-control air pressure port Cv to reach a control air pressure target value F (Psand);
step seven, judging whether the train running direction is from the second axle to the third axle, if so, outputting a second axle sanding control signal by the sanding controller (1), controlling a second axle sanding electromagnetic valve (6) and sanding the second axle; if not, the sanding controller (1) outputs a third shaft sanding control signal to control a third shaft sanding electromagnetic valve (7) to sand the third shaft.
5. A sanding control method as defined in claim 4, characterised in that: the sanding drying control method comprises the following specific steps:
step A, judging whether the following conditions are completely met, namely:
the total wind pressure P of the air supply system is greater than the minimum wind pressure Pmin1 of the dry wind,
the sanding controller (1) does not receive a sanding request command signal sent by a train control system,
the sanding controller (1) does not receive the wheel sliding condition detected by a brake system or the wheel idle signal detected by a traction system, and a sanding test button is not activated; if yes, executing step B; if not, returning to execute the first step;
b, calculating a wind pressure target value of a pre-control wind pressure port Cv of the relay valve (5-4) according to sanding drying wind pressure Pdry, wherein Cv is F (Pdry);
step C, the sanding controller (1) controls an air charging electromagnetic valve (5-1) and an air exhausting electromagnetic valve (5-2) in a closed loop mode according to a feedback signal of a pressure sensor (5-3) to enable pre-control air pressure Cv to reach a control drying air pressure target value F (Pdry);
and D, outputting a sanding drying air control signal by the sanding controller (1), and controlling a second-shaft or third-shaft sanding drying electromagnetic valve (8) to realize the alternate drying control of the second shaft and the third shaft.
6. A sanding control method as defined in claim 5, characterised in that: in the step D, the cycle time of the alternate drying control for the second shaft and the third shaft is 30s to 120 s.
7. A sanding control method as defined in claim 4, characterised in that: the sanding function test control method comprises the following specific steps:
step a, judging whether the following conditions are completely met, namely:
the vehicle speed V is 0km/h, the vehicle is in a stationary state,
the total wind pressure P of the air supply system is greater than the minimum test wind pressure Pmin2,
the sanding controller (1) does not receive a sanding request command signal sent by a train control system;
the sanding controller (1) does not receive the wheel sliding condition detected by a brake system or the wheel idle signal detected by a traction system and receives a sanding test button activation signal; if yes, executing step b; if not, returning to execute the first step;
b, calculating a test wind pressure value Ptest required by a sanding unit (3-2) in the sanding device (3) according to the set test sanding amount Qtest, and calculating a wind pressure target value of a pre-control wind pressure port Cv of a relay valve (5-4), wherein the Cv is F (Ptest);
c, the sanding controller (1) controls the air charging electromagnetic valve (5-1) and the air exhaust electromagnetic valve (5-2) in a closed loop mode according to a feedback signal of the pressure sensor (5-3) to enable the pre-control air pressure Cv to reach a test target value F (Ptest);
d, judging whether a test button of any sanding unit (3-2) of the second shaft is activated or not, and if so, outputting an activation signal of the second shaft sanding electromagnetic valve to control the second shaft sanding electromagnetic valve (6) to sand the second shaft; if not, outputting a third shaft sanding electromagnetic valve activation signal to control a third shaft sanding electromagnetic valve (7) to sand the third shaft.
8. A sanding control method as defined in claim 7, characterised in that: the sanding time for the second and third axes was 10s to 15 s.
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| CN117272685A (en) * | 2023-11-17 | 2023-12-22 | 西南交通大学 | Optimal sanding decision simulation method based on train operation parameters |
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