CN110658395A - Subway train traction inverter test system and method - Google Patents
Subway train traction inverter test system and method Download PDFInfo
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- CN110658395A CN110658395A CN201910609422.1A CN201910609422A CN110658395A CN 110658395 A CN110658395 A CN 110658395A CN 201910609422 A CN201910609422 A CN 201910609422A CN 110658395 A CN110658395 A CN 110658395A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
Abstract
A subway train traction inverter test system and method, including upper PC and lower computer of the off-line testing device of the auxiliary inverter module of subway train to the traction inverter of the subway train; the lower computer sends the state information to the PC, the PC transmits the state information to the backup terminal through the wireless network for storage and backup, the backup terminal can be a notebook computer, the backup terminal is in communication connection with the PC through the wireless network, and the wireless network can be a 3G network or a 4G network. The mode that the PC transmits the state information to the backup terminal is that the PC transmits the state information to the backup terminal in the form of message messages; the combination with other structures and methods effectively avoids the defects that the accuracy of time consumption of the PC machine for identifying the round trip is not facilitated, the number of the message messages transmitted by the following PC machine is not increased fast, and the transmission speed of the message messages is reduced in the prior art.
Description
Technical Field
The invention relates to the technical field of subways, belongs to the technical field of inverters, and particularly relates to a system and a method for testing a traction inverter of a subway train.
Background
The subway is a form of railway transportation, and refers to an urban rail transit system which is mainly operated underground, namely the underground railway or the underground railway is short for description; many such systems may be switched to ground or elevated sections of road in areas outside of urban centers in order to fit the building environment and take into account construction and operating costs. The subway is an urban rail transit system which covers various underground and overground roadways of urban areas, is special in right of way, high in density and high in traffic volume.
With the increase of the operation age of subway trains, equipment is continuously aged, so that train faults occur frequently, and the safe and efficient operation of rail transit is severely restricted. The maintenance and guarantee work of vehicle electrical equipment is increasingly important, an auxiliary inverter system applying the modern inverter technology is used as a core component with high technical content in a subway train, and the function of the whole train is directly influenced by whether the working state of the auxiliary inverter system is normal or not.
An off-line testing device for a subway train auxiliary inverter module of a traction inverter for a subway train has thus been proposed, comprising: a power supply system: the power frequency three-phase alternating current power supply is connected with a 400V power frequency three-phase alternating current power supply and used for providing 900V/1800V output voltage for the auxiliary inverter module to be tested; the control system comprises: the system comprises an upper PC (personal computer) and a lower computer which are communicated with each other, wherein the lower computer is respectively connected with an auxiliary inverter module and a load system; a load system: and the auxiliary inverter module to be tested is connected for realizing continuous single-phase inversion light load detection and static large current detection through loop switching. The power supply system comprises a step-up transformer, an isolation transformer, a first full-bridge rectifier module and a second full-bridge rectifier module, the 400V power frequency three-phase alternating current power supply, the step-up transformer and the isolation transformer are sequentially connected, and the first full-bridge rectifier module and the second full-bridge rectifier module are respectively connected with the isolation transformer.
And the output end of the power supply system is provided with a filter capacitor and a discharge resistor.
The load system comprises an external power supply, a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a resistor, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay, wherein the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay and the seventh relay are controlled to be switched on and switched off by a control system.
The output end A of the auxiliary inverter module is connected with a first inductor through a first relay, the output end B is connected with a second relay and a second inductor through a second relay, the output end C is connected with a third relay and a third inductor through a third relay, the anode of an external power supply is connected with a first capacitor and a resistor through a sixth relay, the cathode of the external power supply is connected with a second capacitor and a seventh relay respectively, the first inductor, the second inductor and the third inductor are connected in parallel, the parallel end of the first inductor and the second inductor are connected between the first capacitor and the second capacitor through the sixth relay, the fourth relay is arranged between the anode of the external power supply and the parallel end, the fifth relay is arranged between the parallel end and the cathode of the external power supply, and the resistor and the seventh relay are connected. The lower computer comprises an ARL microcontroller and a PLC, wherein the model of the ARL microcontroller is LPC2214, and the model of the PLC is S7-300.
The off-line function test of the auxiliary inverter module of the subway train is realized by switching the loop of the load system, including static heavy current detection and continuous single-phase inversion light load power detection, so that the maintenance efficiency and quality of the auxiliary inverter module are improved, the safe and reliable operation of the subway train is ensured, and the method has obvious application value.
The lower computer mainly plays a role in simulating the output of the vehicle auxiliary inverter controller and controlling the loop switching of the load system. The lower computer controls the on and off of the IGBT of the auxiliary inverter module by outputting an IGBT trigger control signal PWL pulse, then collects a feedback signal of the IGBT trigger board for analysis, and sends a state message to the PC.
In order to back up the status message sent to the PC, the PC often transmits the status message to a backup terminal for storage and backup through a wireless network, the backup terminal can be a notebook computer, the backup terminal is in communication connection with the PC through the wireless network, the wireless network can be a 3G network or a 4G network, now, the PC transmits the status message to the backup terminal through a handshake link to the backup terminal in the form of a message, when the PC and the backup terminal transmit the message through the handshake link, the backup terminal receives the message transmitted by the PC and then transmits a feedback message back to the PC, so that the PC recognizes the message received by the backup terminal and requests the next message to the PC.
In the message transfer specification of the handshake link, there are often: the backup terminal faces a link communication, returns a feedback message to the PC when receiving a pair of message messages in the link communication transmitted by the PC, and returns the feedback message to the PC if the latter message is not received within 0.3 second after receiving the first message.
The PC machine determines the back-and-forth time consumption from the PC machine to the backup terminal by means of the time point of receiving each received feedback message and the time point of transmitting the corresponding message, and determines a retardation limit value by means of the determined back-and-forth time consumption, wherein the retardation limit value is the number of message messages to be transmitted to the backup terminal later; in detail, if the round trip time consumption is not large, and the subtraction value of the round trip time consumption is not large, the performance of the current wireless network is better, the PC can increase the retardation limit value, and if the difference value between the round trip time consumption is large, the performance of the current wireless network is poorer, and the PC can decrease the retardation limit value.
For example, the PC first sequentially transmits a first message and a second message to the backup terminal, wherein the first message and the second message are … … messages K, K is a positive integer, the K messages are messages in primary link communication, after receiving the first message and the second message, the backup terminal returns a third feedback message to the PC, and the third feedback message indicates that the message before the third message is successfully received, so as to prompt that the first message and the second message are successfully received by the PC; for example, after receiving the message three and the message four, the backup terminal returns a feedback five message to the PC, and the feedback five message indicates that the message before the message five is successfully received.
The PC machine determines the back-and-forth time consumption from the PC machine to the backup terminal by means of transmitting a corresponding message, namely the time point of the message II and the time point of receiving the feedback message III; as for the PC, the time spent from the PC to the backup terminal is determined by the time point of transmitting the corresponding message, i.e., the message four and the time point of receiving the feedback five messages, in order to feed back the five messages; finally, the PC machine determines a retardation limit value according to the determined time spent in each round trip; if the determined retardation limit value is L, and L is a positive integer, the PC transmits a message K +1, a message K +2 and a message K + L of … … to the backup terminal for a total of L message messages.
However, when the PC initially transmits the message, since the time consumed for the PC to go back and forth to the backup terminal cannot be determined, the PC often uses a low-speed PC method when initially transmitting the message to overcome the problem that the message is lost due to poor wireless network performance, that is, the PC faces a link communication, and only transmits a message in the link communication to the backup terminal during initial transmission; however, in the message transmission specification of the handshake link, because the backup terminal receives only the first message and does not receive the next message, the backup terminal can only transmit the feedback message back to the PC after 0.3 second, which is not favorable for the PC to determine the correctness of the back-and-forth time consumption, so that the number of the message transmitted by the following PC is not increased quickly, and the transmission speed of the message is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a system and a method for testing a subway train traction inverter, which effectively overcome the defects that the correctness of time consumption caused by the identification of a PC (personal computer) is not facilitated, the number of message transmission messages transmitted by the following PC is not increased fast and the transmission speed of the message is reduced in the prior art.
In order to overcome the defects in the prior art, the invention provides a solution for a subway train traction inverter test system and a method, which comprises the following steps:
a subway train traction inverter test system comprises an upper PC (personal computer) and a lower computer of an offline test device of a subway train auxiliary inverter module aiming at a traction inverter of a subway train;
the lower computer sends the state information to a PC (personal computer), the PC transmits the state information to a backup terminal through a wireless network for storage and backup, the backup terminal can be a notebook computer, the backup terminal is in communication connection with the PC through the wireless network, and the wireless network can be a 3G network or a 4G network;
the mode that the PC transmits the state information to the backup terminal is that the PC transmits the state information to the backup terminal in the form of message messages, and the method that the PC transmits the state information to the backup terminal in the form of message messages comprises the following steps:
step A-1: the backup terminal receives the message transmitted by the PC;
in the method, firstly, a link between a backup terminal and a PC is constructed, message messages in link communication are required to be linked to the PC, and after the link is constructed between the PC and the backup terminal, each message in the link communication is transmitted to the backup terminal according to the sequence of each message to be transmitted in the link communication; the PC transmits each message in the link communication to the backup terminal in a low-speed application mode, namely, when the message in the link communication is transmitted to the backup terminal for the first time, only the first message in the link communication is transmitted to the backup terminal, after receiving the feedback message returned by the backup terminal, the back-and-forth time consumption of the PC to the backup terminal is determined by the time point of receiving the feedback message and the time point of transmitting the corresponding message, and then the retardation limit value is configured by the determined back-and-forth time consumption, namely, the value of the number of the message in the link communication to be transmitted to the backup terminal for the next time;
step A-2: determining the link communication affiliated to the message;
after receiving a message, the backup terminal can identify the affiliated link communication of the message by virtue of the identification message in the message;
step A-3: determining whether the message is the first message in the link communication, if so, turning to the step A-4, and if not, turning to the step A-5;
step A-4: returning a feedback message to the PC;
the PC transmits the status message to the backup terminal in the form of message, and the method also comprises the following subsequent steps:
step A-5: the backup terminal determines whether the received previous message is returned to the PC for feedback message, if yes, the step A-6 is carried out, and if not, the step A-4 is carried out;
step A-6: when receiving the next message in the link communication, or after waiting for a preset time, the feedback message is returned to the PC.
The method for transmitting the state message to the backup terminal by the PC in the form of the message can also be as follows:
step B-1: the backup terminal receives the message transmitted by the PC;
step B-2: determining the link communication affiliated to the message;
step B-3: determining whether the message is the first message in the link communication, if so, turning to the step B-4, and if not, turning to the step B-7;
step B-4: determining whether the capacity of the message is lower than a predetermined critical number, if so, jumping to the step B-5, and if not, jumping to the step B-6;
in the method, after the backup terminal determines that the received message is the first message in the received link communication, the backup terminal compares the capacity of the message with the value of the predetermined critical number to determine whether the capacity of the message is lower than the predetermined critical number;
step B-5: returning a feedback message to the PC;
when the capacity of the message is lower than the predetermined critical number, the backup terminal directly returns a feedback message to the PC towards the received message;
step B-6: returning a plurality of feedback messages to the PC;
when the capacity of the message is not higher than the predetermined critical number, the backup terminal can return a plurality of feedback messages to the PC facing the received message; the backup terminal can divide the message into a plurality of sub-messages by means of the capacity of the message and a preset division ratio, and the sub-messages which face the division return feedback messages to the PC;
step B-7: the backup terminal determines whether the received first message is returned to the PC for feedback message, if yes, the step B-8 is carried out, and if not, the step B-5 is carried out;
step B-8: when receiving the next message in the link communication, or after waiting for a predetermined time, the feedback message is returned to the PC.
The notebook computer comprises a hard disk, wherein the hard disk is provided with:
receiving program for receiving message transmitted by PC;
a recognition program for recognizing the link communication belonging to the message received by the receiving program;
a transmission program for returning a feedback message to the PC when the message received by the receiving program is determined to be the first message in the link communication determined by the determination program.
The delivery process is configured to send a feedback message back to the PC if the message is deemed to be the first message in the link communication and the message has a capacity below a predetermined threshold.
The delivery program is configured to send back feedback messages to the PC when the message is identified as the first message in the link communication and the volume of the message is not less than a predetermined threshold.
The transmission program is used for dividing the message into a plurality of sub-messages according to the capacity of the message and a predetermined dividing ratio when the capacity of the message is not lower than a predetermined critical number when the first message in the link communication is identified by brothers, and feeding back a feedback message to the PC facing to the divided sub-messages.
The delivery program is further configured to identify whether the device is a reception-oriented first message and return a feedback message to the PC upon identifying that the message is not a first message in the link communication; if yes, returning feedback information to the PC when the receiving program receives the next message in the link communication or after waiting for a preset time; if not, a feedback message is returned to the PC.
The invention has the beneficial effects that:
the backup terminal of the invention determines whether the received message is the first message in the received link communication after determining the link communication to which the received message belongs, if so, the backup terminal directly returns the feedback message to the PC towards the message, and then the PC does not need to wait for 0.3 second and then return the feedback message, thus, the PC can correctly determine the time consumed from the backup terminal to the PC by the time point of the feedback message returned by the backup terminal in time and the time point of transmitting the first message, and then a plurality of retardation limit values can be better added, thereby being beneficial to improving the transmission speed of the message.
Drawings
Fig. 1 is a flow chart of a method of a subway train traction inverter test system of the present invention.
Fig. 2 is a flow chart of another method of the subway train traction inverter test system of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1 to 2, a subway train traction inverter test system includes an offline test apparatus of a subway train auxiliary inverter module for a traction inverter of a subway train, the apparatus including: a power supply system: the power frequency three-phase alternating current power supply is connected with a 400V power frequency three-phase alternating current power supply and used for providing 900V/1800V output voltage for the auxiliary inverter module to be tested; the control system comprises: the system comprises an upper PC and a lower computer which are communicated with each other and are used for an offline testing device of a subway train auxiliary inverter module of a traction inverter of a subway train; the lower computer is respectively connected with the auxiliary inverter module and the load system; a load system: and the auxiliary inverter module to be tested is connected for realizing continuous single-phase inversion light load detection and static large current detection through loop switching. The power supply system comprises a step-up transformer, an isolation transformer, a first full-bridge rectifier module and a second full-bridge rectifier module, the 400V power frequency three-phase alternating current power supply, the step-up transformer and the isolation transformer are sequentially connected, and the first full-bridge rectifier module and the second full-bridge rectifier module are respectively connected with the isolation transformer.
And the output end of the power supply system is provided with a filter capacitor and a discharge resistor.
The load system comprises an external power supply, a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a resistor, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay, wherein the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay and the seventh relay are controlled to be switched on and switched off by a control system.
The output end A of the auxiliary inverter module is connected with a first inductor through a first relay, the output end B is connected with a second relay and a second inductor through a second relay, the output end C is connected with a third relay and a third inductor through a third relay, the anode of an external power supply is connected with a first capacitor and a resistor through a sixth relay, the cathode of the external power supply is connected with a second capacitor and a seventh relay respectively, the first inductor, the second inductor and the third inductor are connected in parallel, the parallel end of the first inductor and the second inductor are connected between the first capacitor and the second capacitor through the sixth relay, the fourth relay is arranged between the anode of the external power supply and the parallel end, the fifth relay is arranged between the parallel end and the cathode of the external power supply, and the resistor and the seventh relay are connected. The lower computer comprises an ARL microcontroller and a PLC, wherein the model of the ARL microcontroller is LPC2214, and the model of the PLC is S7-300.
The off-line function test of the auxiliary inverter module of the subway train is realized by switching the loop of the load system, including static heavy current detection and continuous single-phase inversion light load power detection, so that the maintenance efficiency and quality of the auxiliary inverter module are improved, the safe and reliable operation of the subway train is ensured, and the method has obvious application value.
The lower computer mainly plays a role in simulating the output of the vehicle auxiliary inverter controller and controlling the loop switching of the load system. The lower computer controls the on and off of the IGBT of the auxiliary inverter module by outputting an IGBT trigger control signal PWL pulse, then collects a feedback signal of an IGBT trigger board for analysis, and sends a state message to the PC, and in order to back up the state message sent to the PC, the PC often transmits the state message to a backup terminal through a wireless network for storage and backup, the backup terminal can be a notebook computer, the backup terminal is in communication connection with the PC through the wireless network, and the wireless network can be a 3G network or a 4G network;
the mode that the PC transmits the state information to the backup terminal is that the PC transmits the state information to the backup terminal in the form of message messages, and the method that the PC transmits the state information to the backup terminal in the form of message messages comprises the following steps:
step A-1: the backup terminal receives the message transmitted by the PC;
in the method, firstly, a link between a backup terminal and a PC is constructed, message messages in link communication are required to be linked to the PC, and after the link is constructed between the PC and the backup terminal, each message in the link communication is transmitted to the backup terminal according to the sequence of each message to be transmitted in the link communication; in detail, the PC transmits each message in the link communication to the backup terminal in a low-speed operation manner, that is, when the message in the link communication is transmitted to the backup terminal for the first time, only the first message in the link communication is transmitted to the backup terminal, after receiving the feedback message returned by the backup terminal, the time point of receiving the feedback message and the time point of transmitting the corresponding message are used to determine the back-and-forth time consumption from the PC to the backup terminal, and then the determined back-and-forth time consumption is used to configure a blocking limit value, that is, the value of the number of the message in the link communication to be transmitted to the backup terminal for the next time;
for example, after the backup terminal and the PC mechanism make a first link communication, the PC machine sequentially transmits a first message to a second message K in the first link communication to the backup terminal, and then the PC machine transmits the first message to the PC machine in a low-speed operation mode, and after receiving a feedback message returned by the backup terminal towards the first message, then determines the time spent back and forth, and configures a retardation limit value according to the time spent back and forth, and if the configured retardation limit value is two, then the PC machine transmits a second message and a third message to the backup terminal, where K is a positive integer.
Step A-2: determining the link communication affiliated to the message;
after receiving a message, the backup terminal can identify the affiliated link communication of the message by virtue of the identification message in the message; for example, since the link-oriented communication is unique via a character string composed of the common address of the PC, the interface number of the PC, the common address of the backup terminal, and the interface number of the backup terminal, which are arranged in this order, the backup terminal can rely on the character string included in the message, that is: and the serial strings consisting of the common address of the PC, the interface number of the PC, the common address of the backup terminal and the interface number II of the backup terminal are arranged in sequence, and the link communication to which the message belongs is determined.
Step A-3: determining whether the message is the first message in the link communication, if so, turning to the step A-4, and if not, turning to the step A-5;
step A-4: returning a feedback message to the PC;
in the method, after the backup terminal determines the link communication to which the received message belongs, the backup terminal determines whether the message is the first message in the received link communication, if so, the backup terminal directly returns the feedback message to the PC towards the message, and then the PC does not need to wait for 0.3 second and then return the feedback message, so that the PC can correctly determine the time consumed from the backup terminal to the PC by the time point of the feedback message returned by the backup terminal in time and the time point of transmitting the first message, and then a multiple retardation limit value can be better added, thereby being beneficial to improving the transmission speed of the message.
As described above, after the PC transmits the first message in the link communication, that is, the message to the backup terminal, the backup terminal recognizes that the message is not received before receiving the first message, so that the backup terminal recognizes that the message is the first message in the link communication received, and returns the feedback message to the PC directly towards the first message, instead of waiting for 0.3 second and then returning the feedback message; the PC can correctly determine the back-and-forth time consumption from the PC to the backup terminal after receiving the feedback message returned by the backup terminal in real time, compared with the mode that the backup terminal waits for 0.3 second and then returns ACK in the current mode, the method can greatly reduce the back-and-forth time consumption determined by the PC, so that the PC can greatly increase the retardation limit value, and can transmit a few message messages when transmitting the message in one link communication to the backup terminal at the next time, thereby improving the transmission speed of the message.
The PC transmits the status message to the backup terminal in the form of message, and the method also comprises the following subsequent steps:
step A-5: the backup terminal determines whether the received previous message is returned to the PC for feedback message, if yes, the step A-6 is carried out, and if not, the step A-4 is carried out;
step A-6: when receiving the next message in the link communication, or after waiting for a preset time, the feedback message is returned to the PC.
If the backup terminal determines that the message is not the first message in the received link communication, that is, the backup terminal receives another message in the link communication before receiving the message, the backup terminal can perform transmission of the feedback message according to the current specification of the handshake protocol, that is, a pair of message messages received in the link communication returns a feedback message to the PC, or waits for a preset time length, which can be 0.3 seconds before returning the feedback message to the PC.
By the method, when the PC only transmits a message to the backup terminal at first, the backup terminal can transmit back the corresponding feedback message at high speed without waiting for 0.3 second and then transmitting back the feedback message, so that the accuracy of the time consumption of the PC for identifying the back-and-forth by virtue of the feedback message can be improved, compared with the mode that the backup terminal in the prior method waits for 0.3 second and then transmits back the feedback message, the PC mode of the feedback message can ensure that the time consumption of the PC for identifying the back-and-forth is not large, so that the retardation limit value is increased, and the transmission speed of the message is improved.
In addition, to further improve the transmission speed of the message, the backup terminal can transmit at least one feedback message back to the backup terminal by the capacity of the message after receiving the first message in a link communication.
The method for transmitting the state message to the backup terminal by the PC in the form of the message can also be as follows:
step B-1: the backup terminal receives the message transmitted by the PC;
step B-2: determining the link communication affiliated to the message;
step B-3: determining whether the message is the first message in the link communication, if so, turning to the step B-4, and if not, turning to the step B-7;
step B-4: determining whether the capacity of the message is lower than a predetermined critical number, if so, jumping to the step B-5, and if not, jumping to the step B-6;
in the method, after the backup terminal determines that the received message is the first message in the received link communication, the backup terminal compares the capacity of the message with the value of the predetermined critical number to determine whether the capacity of the message is lower than the predetermined critical number; the predetermined threshold number can be determined by specific requirements.
Step B-5: returning a feedback message to the PC;
when the capacity of the message is lower than the predetermined critical number, the backup terminal directly returns a feedback message to the PC towards the received message;
step B-6: returning a plurality of feedback messages to the PC;
when the capacity of the message is not higher than the predetermined critical number, the backup terminal can return a plurality of feedback messages to the PC facing the received message; in detail, the backup terminal can divide the message into a plurality of sub-messages according to the capacity of the message and a preset division ratio, and the divided sub-messages return feedback messages to the PC;
if the predetermined critical number is 800 bits and the predetermined division ratio is 0.55, if the message received by the backup terminal is the first message in the link communication and the capacity of the message is 800 bits, the backup terminal determines that the capacity of the message is not lower than the predetermined critical number, divides the first 55% of the capacity of the message into one sub-message and the remaining 45% of the capacity into another sub-message, i.e. divides the first 440bit of the message into one sub-message and the remaining 360 bits into another sub-message, and then transmits the feedback messages back to the PC for the pair of sub-messages, respectively, so that the PC continuously receives the pair of messages with close timing, whereby the PC receives the timing of the pair of feedback messages and the timing of transmitting the message, the method can determine that a pair of small round trip time consumption values and a subtracted value are not large, so that the retardation limit value is increased by the first round trip time consumption value, and then the retardation limit value can be increased by the pair of subtracted values when the pair of subtracted values are not large, so that the number of message messages transmitted to the backup terminal later can be improved.
Step B-7: the backup terminal determines whether the received first message is returned to the PC for feedback message, if yes, the step B-8 is carried out, and if not, the step B-5 is carried out;
step B-8: when receiving the next message in the link communication, or after waiting for a predetermined time, the feedback message is returned to the PC.
In this way, when the message received by the backup terminal is the first message in the link communication to which the message belongs, and the capacity of the message is higher than a predetermined critical number, the message is divided into a plurality of sub-messages, and the feedback messages are respectively returned to the PC for each divided sub-message, so that the transmission speed of the message can be further improved.
The notebook computer comprises a hard disk, wherein the hard disk is provided with:
receiving program for receiving message transmitted by PC;
a recognition program for recognizing the link communication belonging to the message received by the receiving program;
a transmission program for returning a feedback message to the PC when the message received by the receiving program is determined to be the first message in the link communication determined by the determination program.
The delivery process is configured to send a feedback message back to the PC if the message is deemed to be the first message in the link communication and the message has a capacity below a predetermined threshold.
The delivery program is configured to send back feedback messages to the PC when the message is identified as the first message in the link communication and the volume of the message is not less than a predetermined threshold.
The transmission program is used for dividing the message into a plurality of sub-messages according to the capacity of the message and a predetermined dividing ratio when the capacity of the message is not lower than a predetermined critical number when the first message in the link communication is identified by brothers, and feeding back a feedback message to the PC facing to the divided sub-messages.
The delivery program is further configured to identify whether the device is a reception-oriented first message and return a feedback message to the PC upon identifying that the message is not a first message in the link communication; if yes, returning feedback information to the PC when the receiving program receives the next message in the link communication or after waiting for a preset time; if not, a feedback message is returned to the PC.
Therefore, after the backup terminal determines the link communication affiliated to the received message, the backup terminal determines whether the message is the first message in the received link communication, if so, the backup terminal directly returns the feedback message to the PC towards the message, and then the PC does not need to wait for 0.3 second and then return the feedback message, so that the PC can correctly determine the time spent from the backup terminal to the PC by the time point of the feedback message returned by the backup terminal in time and the time point of transmitting the first message, and then a plurality of retardation limit values can be better added, thereby being beneficial to improving the transmission speed of the message.
The present invention has been described in an illustrative manner by the embodiments, and it should be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, but is capable of various changes, modifications and substitutions without departing from the scope of the present invention.
Claims (9)
1. A subway train traction inverter test system comprises an upper PC (personal computer) and a lower computer of an offline test device of a subway train auxiliary inverter module aiming at a traction inverter of a subway train;
the method is characterized in that a lower computer sends a state message to a PC, the PC transmits the state message to a backup terminal through a wireless network for storage and backup, the backup terminal can be a notebook computer, the backup terminal is in communication connection with the PC through the wireless network, and the wireless network can be a 3G network or a 4G network.
2. A method for testing a subway train traction inverter is characterized in that a state message is transmitted to a backup terminal by a PC machine in a mode that the PC machine transmits the state message to the backup terminal in a message mode, and the method for transmitting the state message to the backup terminal by the PC machine in the message mode comprises the following steps:
step A-1: the backup terminal receives the message transmitted by the PC;
in the method, firstly, a link between a backup terminal and a PC is constructed, message messages in link communication are required to be linked to the PC, and after the link is constructed between the PC and the backup terminal, each message in the link communication is transmitted to the backup terminal according to the sequence of each message to be transmitted in the link communication; the PC transmits each message in the link communication to the backup terminal in a low-speed application mode, namely, when the message in the link communication is transmitted to the backup terminal for the first time, only the first message in the link communication is transmitted to the backup terminal, after receiving the feedback message returned by the backup terminal, the back-and-forth time consumption of the PC to the backup terminal is determined by the time point of receiving the feedback message and the time point of transmitting the corresponding message, and then the retardation limit value is configured by the determined back-and-forth time consumption, namely, the value of the number of the message in the link communication to be transmitted to the backup terminal for the next time;
step A-2: determining the link communication affiliated to the message;
after receiving a message, the backup terminal can identify the affiliated link communication of the message by virtue of the identification message in the message;
step A-3: determining whether the message is the first message in the link communication, if so, turning to the step A-4, and if not, turning to the step A-5;
step A-4: feedback messages are returned towards the PC.
3. The method of claim 2, wherein the PC transmitting the status message to the backup terminal in the form of a message further comprises the following subsequent steps:
step A-5: the backup terminal determines whether the received previous message is returned to the PC for feedback message, if yes, the step A-6 is carried out, and if not, the step A-4 is carried out;
step A-6: when receiving the next message in the link communication, or after waiting for a preset time, the feedback message is returned to the PC.
4. The method for testing the subway train traction inverter system according to claim 2, wherein said method for transmitting the status message to the backup terminal by the PC in the form of message can further be:
step B-1: the backup terminal receives the message transmitted by the PC;
step B-2: determining the link communication affiliated to the message;
step B-3: determining whether the message is the first message in the link communication, if so, turning to the step B-4, and if not, turning to the step B-7;
step B-4: determining whether the capacity of the message is lower than a predetermined critical number, if so, jumping to the step B-5, and if not, jumping to the step B-6;
in the method, after the backup terminal determines that the received message is the first message in the received link communication, the backup terminal compares the capacity of the message with the value of the predetermined critical number to determine whether the capacity of the message is lower than the predetermined critical number;
step B-5: returning a feedback message to the PC;
when the capacity of the message is lower than the predetermined critical number, the backup terminal directly returns a feedback message to the PC towards the received message;
step B-6: returning a plurality of feedback messages to the PC;
when the capacity of the message is not higher than the predetermined critical number, the backup terminal can return a plurality of feedback messages to the PC facing the received message; the backup terminal can divide the message into a plurality of sub-messages by means of the capacity of the message and a preset division ratio, and the sub-messages which face the division return feedback messages to the PC;
step B-7: the backup terminal determines whether the received first message is returned to the PC for feedback message, if yes, the step B-8 is carried out, and if not, the step B-5 is carried out;
step B-8: when receiving the next message in the link communication, or after waiting for a predetermined time, the feedback message is returned to the PC.
5. The method of claim 2, wherein the notebook computer comprises a hard disk, and the hard disk stores therein:
receiving program for receiving message transmitted by PC;
a recognition program for recognizing the link communication belonging to the message received by the receiving program;
a transmission program for returning a feedback message to the PC when the message received by the receiving program is determined to be the first message in the link communication determined by the determination program.
6. The method of claim 2, wherein the transmission procedure is used to transmit a feedback message back to the PC when the message is identified as the first message in the link communication and the message has a capacity below a predetermined threshold.
7. The method of claim 2, wherein the delivery process is configured to send back feedback messages to the PC upon determining that the message is the first message in the link communication and that the message has a capacity not less than a predetermined threshold.
8. The method of claim 2, wherein the transfer procedure is used to identify a first message in the link communication when the message is received, and when the message has a capacity not lower than a predetermined threshold number, the message is divided into a plurality of sub-messages according to the capacity of the message and a predetermined division ratio, and a feedback message is returned to the PC in response to the divided sub-messages.
9. The method of claim 2, wherein the delivery process is further configured to identify the device as not being a received first message back to the PC upon identifying that the message is not a first message in the link communication; if yes, returning feedback information to the PC when the receiving program receives the next message in the link communication or after waiting for a preset time; if not, a feedback message is returned to the PC.
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