CN107368020B - A Highly Reliable Pre-shoot Sequential Action Triggering Method - Google Patents

Abstract

A high-reliability pre-firing sequence action trigger method. Before the engine is ignited, a large amount of hydrogen will be emitted. The hydrogen needs to be burned before ignition to prevent the detonation of the hydrogen when the engine is ignited. The hydrogen combustion process is exhausted. For hydrogen combustion, first define the ignition time at time 0s, and the negative time before ignition. At time -t, the programmable logic controller PLC receives the hydrogen exhaust combustion sequence preparation signal from the external system and starts timing; the timing t duration is automatically judged and obtained Hydrogen exhaust combustion ignition signal; at the time of 0s, the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal from the external system, and at the same time, the host computer of the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal through the network and transmits it to the programmable logic controller. The logic controller PLC; then the programmable logic controller PLC makes a logical judgment of "two out of three" from the three signals, and if the signal is valid, it executes the sequence action of hydrogen exhaust combustion.

Description

A Highly Reliable Pre-shoot Sequential Action Triggering Method

technical field

The invention relates to a highly reliable pre-launch sequential action triggering method, which belongs to the technical field of launch vehicle ground measurement, launch and control.

Background technique

The hydrogen-oxygen engine of the launch vehicle that uses the gas generator cycle will emit a large amount of hydrogen before the engine is ignited. The hydrogen needs to be burned before the ignition to prevent the detonation of the hydrogen when the engine is ignited. The hydrogen combustion process is Hydrogen combustion. A high-reliability pre-firing sequential action triggering method is used to reliably trigger the sequential action of hydrogen exhaust combustion and ignition. First, define the ignition time at 0s, and the negative time before ignition. At -t time, the programmable logic controller PLC receives the hydrogen exhaust combustion timing preparation signal from the external system, and starts timing; the timing t duration is automatically judged to obtain hydrogen exhaust combustion Ignition signal; at the time of 0s, the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal from the external system, and at the same time, the upper computer of the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal through the network and transmits it to the programmable logic controller PLC; then the programmable logic controller PLC performs a logical judgment of "out of three" on the three signals, and if the signal is valid, it executes the sequence action of hydrogen exhaust combustion.

The launch process of the launch vehicle involves the collaborative work between many systems, and the work in some systems needs to receive signals from some external systems to drive the execution of timing actions inside the system. At the same time, for occasions requiring high reliability, two situations of "early execution" and "no execution" must be avoided.

In the existing ground launch test process, the timing action driven by the signal of the external system generally adopts the double redundancy of the signal channel to enhance the reliability of signal reception, and at the same time adds the link of operator confirmation to improve the reliability of the action; The dual redundancy method is essentially a signal, which is transmitted through multiple signal channels, without realizing the redundancy of the signal itself, that is, the dual redundancy design is essentially driven by a signal to drive the timing action, just for the signal to be backed up A communication channel; and the link of operator confirmation will also reduce the efficiency of sequential action execution.

Contents of the invention

The technical problem of the present invention is to overcome the deficiencies of the prior art, provide a highly reliable sequential action triggering method, and improve the reliability and safety of the pre-shot sequential action.

The technical solution of the present invention is: a highly reliable pre-shooting sequence action triggering method, including the following steps:

(1) Define the stage before the rocket takes off as the pre-shooting stage, take the ignition of the rocket as the time 0s, and the time -t before the ignition. After the programmable logic controller PLC collects the external hydrogen exhaust combustion ignition preparation command signal through the digital quantity acquisition module DI, it automatically Time the duration of t, that is, when the time of 0s is reached, the programmable logic controller PLC generates a hydrogen exhaust combustion ignition signal;

(2) At the moment -t ₁ , the man-machine interface of the upper computer of the programmable logic controller PLC manually executes the unlocking command of the hydrogen exhaust combustion ignition timing action, so that the programmable logic controller PLC executes the ignition action unlocking, t ₁ >t;

(3) At 0s, the programmable logic controller PLC collects the hydrogen exhaust combustion ignition signal of the external system through the digital quantity acquisition module DI module;

(4) At 0s, the upper computer of the programmable logic controller PLC receives the network ignition signal of the external system through the Ethernet, and the upper computer of the programmable logic controller PLC transmits the network ignition signal to the programmable logic controller PLC ;

(5) After the ignition action in step (2) is unlocked, the hydrogen exhaust combustion ignition signal generated by the programmable logic controller PLC in step (1) and the hydrogen exhaust combustion ignition signal of the external system collected by the digital quantity acquisition module DI module in step (3) are ignited Signal, and step (4) network hydrogen exhaust combustion ignition signal, automatically perform three out of two logical judgments, that is, receive step (1) hydrogen exhaust combustion ignition signal generated by programmable logic controller PLC, step (3) pass digital quantity The acquisition module DI module collects the hydrogen exhaust combustion ignition signal collected from the external system and two or more signals in the network hydrogen exhaust combustion ignition signal in step (4), then it is determined that the hydrogen exhaust combustion ignition signal is valid, that is, the hydrogen exhaust combustion ignition is performed.

The programmable logic controller PLC automatic timing function in the step (1) can select to utilize the programmable logic controller PLC internal clock or a peripheral high-precision clock for automatic timing according to the accuracy level requirements of the sequential action.

The t ₁ is 10-15 seconds.

The unlocking command of the sequence action of hydrogen exhaust combustion in the step (2) is a prerequisite for the execution of the sequence action of hydrogen exhaust combustion. Only when the sequence action of hydrogen exhaust combustion has been unlocked can the sequence action of hydrogen exhaust combustion be executed to improve The safety of the sequential action of hydrogen exhaust combustion.

Compared with the prior art, the present invention has the following advantages:

(1) The present invention is based on the dual redundancy of signal channels in the prior art. The dual redundancy of signal channels essentially means that one signal passes through multiple signal channels, while the signal trigger method of the present invention realizes the multiple redundancy of the signal itself , improving the reliability of the signal.

(2) The present invention saves the link of confirming the signal trigger time by the operator, saves the time of manual judgment by the operator, and directly adopts the "two out of three" logic for automatic judgment, which ensures reliability and improves the efficiency of action execution.

(3) The present invention can freely select the internal timer of programmable logic controller PLC as the signal source of automatic timing according to the time precision requirement of sequence action, also can use the outside of high precision always as the signal source of automatic timing, can be in Make the best choice in terms of performance and cost.

(4) The pre-shooting timing action triggering method of the present invention, except for the timing action triggering accident of hydrogen exhaust combustion ignition, is essentially a general timing action triggering method, which can be used in other timing action automatic triggering applications with high reliability requirements Both can be used, and the method has strong versatility.

(5) The pre-launch timing action triggering method of the present invention requires the operator to perform the unlocking action before entering the pre-launch timing action triggering process. The pre-launch process of the launch vehicle is complicated, so adding the manual unlocking of the operator can improve the pre-launch time. process security.

Description of drawings

Fig. 1 is a flowchart of the present invention;

Fig. 2 is a signal flow diagram of the present invention;

Fig. 3 is a schematic diagram of the "out of three" logic control of the present invention.

Detailed ways

A highly reliable timing action triggering method, using the gas generator cycle of the hydrogen-oxygen engine of the launch vehicle, before the engine is ignited, a large amount of hydrogen will be discharged, and the hydrogen needs to be burned before the ignition to prevent the hydrogen from being ignited when the engine is ignited Detonation occurs, and this hydrogen combustion process is called hydrogen exhaust combustion. A high-reliability pre-firing sequential action triggering method is used to reliably trigger the sequential action of hydrogen exhaust combustion and ignition. First, define the ignition time at 0s, and the negative time before ignition. At -t time, the programmable logic controller PLC receives the hydrogen exhaust combustion timing preparation signal from the external system, and starts timing; the timing t duration is automatically judged to obtain hydrogen exhaust combustion Ignition signal; at the time of 0s, the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal from the external system, and at the same time, the upper computer of the programmable logic controller PLC receives the hydrogen exhaust combustion ignition signal through the network and transmits it to the programmable logic controller PLC; then the programmable logic controller PLC performs a logical judgment of "out of three" on the three signals, and if the signal is valid, it executes the sequence action of hydrogen exhaust combustion.

A high-reliability pre-shooting sequential action triggering method of the present invention comprises the following steps:

(1) Define the stage before the rocket takes off as the pre-shooting stage, take the ignition of the rocket as the time 0s, and the time -t before the ignition. After the programmable logic controller PLC collects the external hydrogen exhaust combustion ignition preparation command signal through the digital quantity acquisition module DI, it automatically Time the duration of t, that is, when the time of 0s is reached, the programmable logic controller PLC generates a hydrogen exhaust combustion ignition signal;

(2) At the moment -t ₁ , the man-machine interface of the upper computer of the programmable logic controller PLC manually executes the unlocking command of the hydrogen exhaust combustion ignition timing action, so that the programmable logic controller PLC executes the ignition action unlocking, t ₁ >t;

(3) At 0s, the programmable logic controller PLC collects the hydrogen exhaust combustion ignition signal of the external system through the digital quantity acquisition module DI module;

(4) At 0s, the upper computer of the programmable logic controller PLC receives the network ignition signal of the external system through the Ethernet, and the upper computer of the programmable logic controller PLC transmits the network ignition signal to the programmable logic controller PLC ;

(5) After the ignition action in step (2) is unlocked, the hydrogen exhaust combustion ignition signal generated by the programmable logic controller PLC in step (1) and the hydrogen exhaust combustion ignition signal of the external system collected by the digital quantity acquisition module DI module in step (3) are ignited Signal, and step (4) network hydrogen exhaust combustion ignition signal, automatically perform three out of two logical judgments, that is, receive step (1) hydrogen exhaust combustion ignition signal generated by programmable logic controller PLC, step (3) pass digital quantity The acquisition module DI module collects the hydrogen exhaust combustion ignition signal collected from the external system and two or more signals in the network hydrogen exhaust combustion ignition signal in step (4), then it is determined that the hydrogen exhaust combustion ignition signal is valid, that is, the hydrogen exhaust combustion ignition is performed.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The hydrogen exhaust combustion system of the launch vehicle includes: a programmable logic controller PLC and an ignition device; the programmable logic controller PLC stores and runs the hydrogen exhaust combustion ignition sequence control program, and collects external data through the digital quantity acquisition module DI of the programmable logic controller. The command signal of the system; the ignition device is located on the launch platform of the carrier rocket, and the programmable logic controller PLC can control the ignition device to ignite and ignite the hydrogen discharged from the engine; the upper computer of the programmable logic controller PLC has a man-machine interface, which can Data interaction with external systems and programmable logic controller PLC via Ethernet.

As shown in Figure 2, it is a signal flow diagram of the present invention. The signal source of the external system can send "hydrogen exhaust combustion ignition preparation" and "hydrogen exhaust combustion ignition" according to the pre-launch process of the launch vehicle to the programmable logic control through the signal switching equipment In addition, the external system signal source can also send the "hydrogen exhaust combustion ignition" signal to the host computer through the Ethernet switch, and the host computer forwards this signal to the programmable logic controller PLC through the Ethernet switch , at 0s, the programmable logic controller PLC automatically judges, receives two hydrogen exhaust combustion ignition signals sent by the external system and the hydrogen exhaust combustion ignition signal generated by the automatic timing t duration, two or more of these three signals If it is effective, the programmable logic controller PLC controls the ignition device through the output module of the PLC to complete the hydrogen exhaust combustion ignition.

According to the pre-launch process of the launch vehicle, 0s is the ignition time, and the negative time before 0s is the pre-launch stage. As shown in Figure 1, it is a flow chart of the present invention.

(1) At time -t ₁ , when the operator confirms that the hydrogen exhaust combustion is ready to execute, the operator manually executes the hydrogen exhaust combustion ignition timing action unlock command through the man-machine interface of the upper computer, so that the programmable logic controller PLC The ignition action is unlocked, t ₁ >t; in the case that the hydrogen exhaust combustion ignition timing action is not unlocked, the ignition action will not be performed even if the hydrogen exhaust combustion ignition signal is subsequently received.

(2) At time -t, the signal source of the external system sends a hydrogen exhaust combustion ignition preparation command. After the programmable logic controller PLC collects the hydrogen exhaust combustion ignition preparation command signal of the external system through the digital quantity acquisition module DI, it starts the peripheral high-precision The clock timer starts counting and automatically counts the duration of t, that is, when the time 0s is reached, the programmable logic controller PLC judges that this is the ignition time, and automatically generates a hydrogen exhaust combustion ignition signal;

(3) At 0s, the signal source of the external system sends a hydrogen exhaust combustion ignition command through the signal transfer device, and the programmable logic controller PLC collects the hydrogen exhaust combustion ignition signal of the external system through the digital quantity acquisition module DI module;

(4) At 0s, the external system sends a hydrogen exhaust combustion ignition signal through the Ethernet switch, and the upper computer of the programmable logic controller PLC receives the network ignition signal of the external system through the Ethernet, and the upper computer of the programmable logic controller PLC The network ignition signal is transmitted to the programmable logic controller PLC;

(5) After the ignition action is unlocked, the hydrogen exhaust combustion ignition signal generated by the programmable logic controller PLC after automatic timing in (2), and the hydrogen exhaust combustion ignition signal of the external system collected by the digital quantity acquisition module DI module in (3) signal, (4) The hydrogen exhaust combustion ignition signal forwarded by the upper computer automatically performs a two-out-of-three logic judgment, that is, two or more of the three hydrogen exhaust combustion ignition signals are valid, and then it is determined that the hydrogen exhaust combustion ignition The signal is valid, and the output module of the programmable logic controller PLC controls the ignition device to perform the hydrogen exhaust combustion ignition action.

In Figure 2, except that the signal source of the system is not clearly required, all other devices adopt the hot standby redundancy method, that is, two sets of equipment with the same function are equipped, and the two sets work at the same time as hot backup for each other. In the event of a failure, the normal use of the equipment can also be guaranteed; the system has the ability to work normally under the condition of a failure, and the reliability of the hydrogen exhaust combustion timing action is improved;

In Figure 2, the signal switching equipment adopts the relay isolation switching method to isolate the hydrogen exhaust combustion system from the external system circuit without interfering with each other; the series-parallel circuit design method is adopted to ensure that adhesion or short circuit occurs at one relay contact Under certain conditions, it will not affect the signal transmission, further improving the reliability of signal transmission;

As shown in Fig. 3, it is a control schematic diagram of two out of three logical judgments. Firstly, the logical "AND" operation is performed on the three hydrogen exhaust combustion ignition signals; secondly, the logical "OR" operation is performed on the three signals output by the logical "AND" operation; the logical expression is as follows:

Ignition signal is effective=(ignition signal_from*ignition signal_outside)+(ignition signal_from*ignition signal_net)+(ignition signal_net*ignition signal_outside);

Among them, "ignition signal_self" is the hydrogen exhaust combustion ignition signal generated by the programmable logic controller PLC automatic timing; "ignition signal_external" is the hydrogen exhaust combustion ignition signal sent by the external system through the signal transfer equipment; _Net” is the hydrogen exhaust combustion ignition signal forwarded by the host computer via the Ethernet switch; the hydrogen exhaust combustion ignition signal is a digital quantity, that is, a Boolean variable, 0 means invalid, 1 means valid, so in the above logical expression, only three When any two or three of the two signals are 1, the ignition signal is valid, realizing the logical judgment of two out of three;

The ignition reliability of the hydrogen exhaust combustion of the launch vehicle is high, and the situation of "early execution" and "non-execution" must be avoided. Signal interference is a factor that must be considered, especially the impact of signal pulse interference, which may lead to premature ignition timing. Therefore, the hydrogen exhaust combustion ignition control program in the programmable logic controller PLC is added to the signal filtering function of the digital quantity acquisition module DI, and the signal that is 1 in five consecutive scan cycles of the programmable logic controller PLC is judged to be valid;

According to the timing action triggering method of the present invention, the delay time from when the system sends out the hydrogen exhaust combustion ignition signal at time 0s to when the programmable logic controller PLC output module controls the ignition device to perform the ignition action is respectively:

a) The hydrogen exhaust combustion ignition signal generated by the automatic timing of the programmable logic controller PLC: the delay time is the inherent scan period of the PLC itself, and the scan period of the hot standby redundant programmable logic controller PLC is generally about 20ms;

b) The hydrogen exhaust combustion ignition signal sent by the external system via the signal transfer device: the relay action time of the signal transfer device is generally within 5ms; due to the existence of the signal filtering function, it needs to be delayed for 5 consecutive scan cycles. Therefore, this The signal delay is about 105ms;

c) The hydrogen exhaust combustion ignition signal forwarded by the host computer via the Ethernet switch: this signal is transmitted via the Ethernet, and the signal is sent in the form of instructions through the Ethernet, without signal filtering, and the transmission is generally about 100ms;

Since the programmable logic controller PLC is cyclically detecting the valid types of the above three signals in each scan cycle after the hydrogen exhaust combustion action is unlocked, and the hydrogen exhaust combustion ignition action can be performed if the two signals are valid, the programmable logic The delay time _t2 of the output module of the controller PLC to output the ignition command is about 100ms< _t2 <105ms, which meets the requirement of rapidity of the ignition sequence.

Claims (3)

1. one kind is highly reliable to penetrate preceding timing action triggers method, it is characterised in that: comprise the following steps that

(1) it defines before rocket takes off to penetrate the last stage, with rocket firing for the 0s moment, before igniting-and t moment, programmable logic control Device PLC processed collects external row's hydrogen burning by digital data acquisition module DI and lights a fire after preparation instruction signal, when self-clocking t Long, that is, when reaching the 0s moment, programmable logic controller (PLC) PLC generates row's hydrogen burning ignition signal；

(2) in-t₁Moment, when the host computer man-machine interface manual operation of programmable logic controller (PLC) PLC executes row's hydrogen burning igniting Sequence acts unlocking command, and programmable logic controller (PLC) PLC is made to execute firing action unlock, t₁> t；

(3) in 0s, programmable logic controller (PLC) PLC acquires row's hydrogen burning of external system by digital data acquisition module DI module Ignition signal；

(4) in 0s, the host computer of programmable logic controller (PLC) PLC arranges hydrogen burning point by the network that Ethernet receives external system Network row's hydrogen burning ignition signal is transmitted to programmable logic control by the host computer of fiery signal, programmable logic controller (PLC) PLC Device PLC processed；

(5) it after the unlock of step (2) firing action, lights a fire and believes to row's hydrogen burning that step (1) programmable logic controller (PLC) PLC is generated Number, step (3) hydrogen burning ignition signal and step (4) network arranged by the external system that digital data acquisition module DI module acquires Hydrogen burning ignition signal is arranged, it is automatic to execute two from three logic judgment, that is, receive step (1) programmable logic controller (PLC) PLC generation Row's hydrogen burning ignition signal, row's hydrogen burning for acquire from external system by digital data acquisition module DI module of step (3) lights a fire More than two signals in signal and step (4) network row's hydrogen burning ignition signal then determine that arranging hydrogen burning ignition signal has Effect, that is, the row's of progress hydrogen burning are lighted a fire.

2. one kind according to claim 1 is highly reliable to penetrate preceding timing action triggers method, it is characterised in that: the step (1) the programmable logic controller (PLC) PLC self-clocking function in can be according to the accuracy class requirement that timing acts, Selection utilization Programmable logic controller (PLC) PLC internal clocking or peripheral hardware high precision clock carry out self-clocking.

3. one kind according to claim 1 is highly reliable to penetrate preceding timing action triggers method, it is characterised in that: the step (2) row's hydrogen burning igniting sequential in acts unlock instruction, for the precondition that row's hydrogen burning igniting sequential movement executes, is arranging Hydrogen burning igniting sequential movement executed unlock under conditions of, could the row's of execution hydrogen burning igniting sequential act, with the row of being promoted The safety of hydrogen burning igniting sequential movement.