CN101922365A - Control system of intake valve assembly in auxiliary power device - Google Patents
Control system of intake valve assembly in auxiliary power device Download PDFInfo
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- CN101922365A CN101922365A CN2010102420108A CN201010242010A CN101922365A CN 101922365 A CN101922365 A CN 101922365A CN 2010102420108 A CN2010102420108 A CN 2010102420108A CN 201010242010 A CN201010242010 A CN 201010242010A CN 101922365 A CN101922365 A CN 101922365A
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Abstract
The invention relates to a control system of an intake valve assembly in an auxiliary power device. In the invention, high-efficiency system debugging is realized by relying on an intake valve excitation control circuit, wherein the intake valve excitation control circuit comprises an open control signal and close control signal drive circuit and a drive current and overcurrent monitoring circuit; in the open control signal and close control signal drive circuit, when an open command and a close command are simultaneously generated, the two commands pass through an NAND gate logic to guarantee that the open command has the priority. The invention optimizes relative circuits of the control system of the intake valve assembly in the auxiliary power device, has the advantages of reasonable control and high reliability and can also improve the maintenance and trouble shooting efficiency.
Description
Technical field
The present invention relates to a kind of control system of intake valve assembly, be specifically related to the control system of intake valve assembly in a kind of auxiliary power unit.
Background technique
Growing along with current auxiliary power unit, improving constantly of user's request, the design of various kinds of sensors, actuation mechanism is more and more complete in system, under the increasingly sophisticated prerequisite of system architecture, the user is more and more higher especially to the requirement of security of system, reliability, maintainability, therefore be in design or all will pay attention to the application of fault diagnosis technology in safeguarding, could improve reliability of products and maintainability like this.
At present, there is following problem in the control system of intake valve assembly in the existing auxiliary power unit: at first, intake valve is difficult to automatically control or realizes that control automatically is comparatively complicated, cause the action of switch door whether to be finished can't confirming or the affirmation process loaded down with trivial details, so security of system is lower; Secondly, existing system is not monitored driving current and driving voltage, can't learn system running state in real time, thus system to get reliability low; At last, owing to driving current and driving voltage are not monitored, can't analyze, be difficult to determine at short notice the fault occurrence positions, so the maintainability of system and fault diagnosis rate are low fault.
To sum up, the control system of intake valve assembly can't satisfy the requirement of user to security of system, reliability, maintainability in the existing auxiliary power unit.
Summary of the invention
The object of the present invention is to provide the control system of intake valve assembly in a kind of auxiliary power unit, its solved in the background technique in the auxiliary power unit intake valve assembly reliability low, be difficult to safeguard and the inefficient technical problem of fault diagnosis.
Technical solution of the present invention is:
The control system of intake valve assembly in this auxiliary power unit, comprise the intake valve excitation control circuit that system debug is fixed a breakdown that is used for that is connected with processor, intake valve excitation control circuit comprises drive circuit, driving current and the overcurrent supervisory circuit of open the door control signal and pass gate control signal; The input signal of intake valve excitation control circuit comprises the control signal of opening the door (the order discrete signal promptly opens the door), pass gate control signal (the order discrete signal of promptly closing the door), door actuating signal and door driving current signal; The output signal of described intake valve excitation control circuit comprise open the door drive excitation pulse, closing the door drives excitation pulse, gate drive voltage monitoring, the monitoring of door driving current, door and drove flow monitoring and the gate current signal that unrolls; The described control signal and closing in the gate control signal drive circuit of opening the door when open the door the order discrete signal and the order discrete signal of closing the door are imported simultaneously, has preference by the AND NOT gate logic order discrete signal of determining to open the door.
The order discrete signal that opens the door is the command signal that control intake valve that processor sends is opened; The order discrete signal of closing the door is the command signal of the control IC Intake Valve Closes that sends of processor; The door actuating signal be used for initialization enter the excitation control circuit signal; The door driving current signal is a control sampling resistor feedback, is used to reflect the size of driving current; Whether opening the door and driving excitation pulse is control high-power FET road break-make, control the driving voltage that opens the door and export; Closing the door and driving excitation pulse is control high-power FET road break-make, and whether control pass gate drive voltage is exported; The gate drive voltage supervisory signal is whether the monitoring drive circuit drives intake valve, has driving voltage output then to be high level; Whether the monitoring drive circuit drives intake valve during door driving current supervisory signal, has driving current output then to be high level; It is whether overcurrent of monitoring intake valve drive circuit that door drives the overcurrent supervisory signal, and overcurrent then is a high level; The gate current signal that unrolls is the size that is used to reflect driving current.
The control system of intake valve assembly also comprises the fault tree model that is used to improve the fault diagnosis hit rate in the above auxiliary power unit; Described driving current and overcurrent supervisory circuit output fault recording, the fault point contrast of fault recording and fault tree model, fault location.Wherein the foundation of fault tree model may further comprise the steps: 1] define system fault and set up fault tree; 2] by analysis and laboratory data, draw each incident probability of happening to this accessory power system intake valve assembly; 3] draw probability importance degree and fault coefficient by each incident probability of happening; 4] according to the ordering of fault coefficient magnitude, determine the Breakdown Maintenance flow process.
The above opens the door in control signal and the pass gate control signal drive circuit, when the order discrete signal that opens the door was high level HI, the switch triode V1 conducting of setovering produced voltage U 1 by resistance R 34, drive the FET power tube, light idol V61 is controlled at the FET power tube is disconnected; Wherein voltage U 1 is to be combined into the line delay deglitch by resistance R 36 and capacitor C 11; When the command signal of opening the door was low level LO, the order of closing the door can be passed through the AND NOT gate logic, makes switch triode V2 conducting; Produce voltage U 2 through resistance R 38, drive the FET power tube, light idol V62 is controlled at the FET power tube is disconnected; Described voltage U 2 is through resistance R 40 and capacitor C 12 combinatorial delays deglitch.
A precision resistance is set between the power supply of the above driving current and overcurrent supervisory circuit and the exciting circuit, and the pressure drop on the precision resistance is connected with amplifier; Described amplifier is imported at in-phase end by two divider resistances respectively, and two divider resistances are imported at backward end in addition; The exciting current that described exciting circuit the produces signal that unrolls is passed to A/D converter as ratio-voltage; The output voltage of described amplifier is the corresponding 0.1V voltage of every 1A exciting current.
The above institute exciting current signal that unrolls also is connected with comparator; Described comparator comprises the first comparator N4A and the second comparator N4B, when electric current greater than 0.5V, when the first comparator N4A out gate current monitoring discrete magnitude was high, expression had driving current work; When electric current greater than 10A, the second comparator N4B out gate is crossed the flow monitoring discrete magnitude when being high, the expression overcurrent; During the door driven, the gate drive voltage that opens the door/close by high power valve output on the motherboard also feeds back to this function module, provide gate drive voltage monitoring discrete magnitude by dividing potential drop and mu balanced circuit, its type is a Transistor-Transistor Logic level, if then represent to have gate drive voltage output during high level; During overcurrent, this is crossed the flow monitoring discrete magnitude and drives light idol V61, light idol V62 by d type flip flop D2A and make the opening-closing door excitation pulse become 28V from 13V to make that high power valve disconnects on the motherboard, thereby shutoff door drives output.
The above precision resistance is 0.1 Ω, is used to guarantee precision; The power supply of driving current and overcurrent supervisory circuit is+28V; Voltage U 1 is+13V with voltage U 2.
The invention has the advantages that:
1, optimized the control system interlock circuit of intake valve assembly in the auxiliary power unit, control is reasonable, the reliability height;
2, consider the needs of maintenance, the fault point is set, come fault location by fault recording according to the fault tree analysis conclusion; Can use the ground maintenance machine to check the fault of record;
When 3, safeguarding, can obtain the fault coefficient in conjunction with fault diagnosis according to the fault that system quotes and formulate the troubleshooting flow process, can improve maintenance and troubleshooting efficient.
Description of drawings
Fig. 1 is an intake valve assembly fault tree illustraton of model;
Fig. 2 is intake valve excitation control circuit block diagram;
Fig. 3 is control signal and the pass gate control signal regulating circuit of opening the door;
Fig. 4 is driving current and overcurrent supervisory circuit.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail,
The control system of intake valve assembly in this auxiliary power unit, comprise the intake valve excitation control circuit that system debug is fixed a breakdown that is used for that is connected with processor, intake valve excitation control circuit comprises drive circuit, driving current and the overcurrent supervisory circuit of open the door control signal and pass gate control signal; The input signal of intake valve excitation control circuit comprises the order discrete signal that opens the door, the order discrete signal of closing the door, door actuating signal and door driving current signal; The output signal of intake valve excitation control circuit comprise open the door drive excitation pulse, closing the door drives excitation pulse, gate drive voltage monitoring, the monitoring of door driving current, door and drove flow monitoring and the gate current signal that unrolls; The control signal of opening the door and closing in the gate control signal drive circuit when open the door the order discrete signal DOPENCODS and the order discrete signal DCLOSCODS that closes the door import simultaneously, has preference by the AND NOT gate logic order discrete signal of determining to open the door.Specifically referring to table-1 intake valve coherent signal
Table 1
The physical circuit of the control signal of opening the door and pass gate control signal drive circuit designs as shown in Figure 2:
Make V1 biasing conducting during the command signal of opening the door DOPENCODS (P2B16) HI, produce one+13V by R34 like this and drive the FET power tube.This voltage is combined into the line delay deglitch by R36 and C11.Light idol V61 is controlled at power tube is disconnected.
Command signal DOPENCODS is LO if open the door, and the order DCLOSCODS that closes the door could pass through the AND NOT gate logic, makes the V2 conducting.Produce one+13V voltage through R38 like this.This voltage drives the FET power tube through R40/C12 combinatorial delays deglitch.Light idol V62 is controlled at power tube is disconnected.
Except finishing the opening of intake valve, closing control, considered simultaneously the monitoring of driving current, driving voltage, offer processor as discrete magnitude, in order to improve the reliability of system.The precision resistance of one 0.1 Ω is connected+28V power supply and exciting circuit between.Pressure drop is connected to amplifier N10C on it, and by divider resistance R124, R125 imports at in-phase end, R126, and R127 imports at backward end, and this amplifier output voltage is the corresponding 0.1V voltage of every 1A exciting current.The exciting current signal DOORCWADC (P2A9) that unrolls passes to A/D converter as ratio-voltage like this.
The exciting current signal DOORCWADC (P2A9) that unrolls is also connected to comparator.
If electric current is high (HI) greater than 0.5V comparator N4A output DOORCD, expression has driving current work.If electric current greater than 10A then N4B output DOOROC be high, is represented overcurrent.At this moment this signal makes opening-closing door excitation pulse DOPNCOG5/DCLOSCOG4 become 28V from 13V by d type flip flop D2A driving light idol V61, V62 and makes high power valve disconnection on the motherboard, thereby shutoff door drives output.
When the door driven, then open the door/close gate drive voltage DOPNCODSP and the DCLOSCODSP by high power valve output on the motherboard also feeds back to the ACM module, provide gate drive voltage monitoring DOORVD by dividing potential drop and mu balanced circuit, be Transistor-Transistor Logic level, height then represents to have gate drive voltage output.
The control system of intake valve assembly also comprises the fault tree model that is used to improve the fault diagnosis hit rate in this auxiliary power unit; Wherein driving current and overcurrent supervisory circuit are exported fault recording, the fault point contrast of fault recording and fault tree model, fault location.Wherein the foundation of fault tree model may further comprise the steps: 1] define system fault and set up fault tree; 2] by analysis and laboratory data, draw each incident probability of happening to this accessory power system intake valve assembly; 3] draw probability importance degree and fault coefficient by each incident probability of happening; 4] according to the ordering of fault coefficient magnitude, determine the Breakdown Maintenance flow process.
It is as follows that it sets up detailed process: by the analysis to this auxiliary power unit intake valve assembly, system is delimitd a boundary line, it is the intake valve fault, analyze top event reason that take place, direct, necessary and sufficient then and draw 8 secondary top events, and then by constantly to the analysis of system, successively downward, arrive the decomposition limit of fault tree always, fault tree is decomposed into several bottom events.As shown in Figure 1, the implication of each incident of fault tree is referring to table 2, and the fault recording table sees Table 3.
Fault tree model thus by qualitative analysis, fault tree quantitative analysis, importance degree analysis, can get:
Each probability of malfunction importance degree is in proper order:
X
11＞X
13＞X
7＞X
10＞X
9＞X
8＝X
6＞X
5＞X
12＞X
2＝X
4＞X
1＝X
3
The general fault coefficient of each fault is in proper order:
X
11＞X
7＞X
12＞X
10＞X
9＞X
8＝X
6＞X
5＞X
13＞X
2＝X
4＞X
1＝X
3
Wherein probability importance degree order can be for reliability design provides foundation, and fault coefficient order can improve the efficient of system debug troubleshooting.
Table 2 fault tree door incident implication
| Door or incident | Definition |
| T | The intake valve fault |
| M 1 | The complete opening signal fault of intake valve |
| M 2 | The complete shutdown signal fault of intake valve |
| M 3 | Intake valve is opened overlong time |
| M 4 | The IC Intake Valve Closes overlong time |
| M 5 | Intake valve is opened drive circuit overcurrent (can recover) |
| M 6 | IC Intake Valve Closes drive circuit overcurrent (can recover) |
| M 7 | Intake valve is opened drive circuit overcurrent (irrecoverable) |
| M 8 | IC Intake Valve Closes drive circuit overcurrent (irrecoverable) |
| M 9 | It is too small that intake valve is opened driving current |
| M 10 | The hydraulic actuator fault |
| M 11 | The IC Intake Valve Closes driving current is too small |
| M 12 | Hydraulic system fault |
| X 1 | Intake valve is opened sensor fault fully |
| X 2 | Intake valve is opened discrete magnitude conditioning circuit fault fully |
| X 3 | The complete closure sensor fault of intake valve |
| X 4 | Intake valve is closed discrete magnitude conditioning circuit fault fully |
| X 5 | The intake valve actuator is stuck |
| X 6 | Intake valve is opened the drive circuit fault |
| X 7 | The sample circuit fault |
| X 8 | IC Intake Valve Closes drive circuit fault |
| X 9 | Load short circuits |
| X 10 | Logic breaking circuit fault |
| X 11 | Load cut-off |
| X 12 | Hydraulic system is under-voltage |
| X 13 | The PTU fault |
Table 3 fault recording table
By analysis and the laboratory data to this accessory power system intake valve assembly, the roughly probability that each bottom event takes place sees Table 4:
Table 4 bottom event probability of malfunction
| Bottom event | Probability of malfunction |
| Intake valve is opened sensor fault fully | 0.0001 |
| Intake valve is opened discrete magnitude conditioning circuit fault fully | 0.0002 |
| The complete closure sensor fault of intake valve | 0.0001 |
| Intake valve is closed discrete magnitude conditioning circuit fault fully | 0.0002 |
| The intake valve actuator is stuck | 0.0005 |
| Intake valve is opened the drive circuit fault | 0.001 |
| The sample circuit fault | 0.005 |
| IC Intake Valve Closes drive circuit fault | 0.001 |
| Load short circuits | 0.002 |
| Logic breaking circuit fault | 0.003 |
| Load cut-off | 0.008 |
| Hydraulic system is under-voltage | 0.005 |
| The PTU fault | 0.0003 |
Bottom event probability importance degree is meant the size that bottom event is made contributions to top event, and note is made Ig:
Fault coefficient F:
F
i＝I
g(i)·K
i
(2)
Can try to achieve probability importance degree, the fault coefficient of each bottom event from formula (1), formula (2) and table 4, see Table 5
Table 5 bottom event probability importance degree, fault coefficient
| Bottom event | The probability importance degree | The fault coefficient |
| Intake valve is opened sensor fault fully | 0.9792 | 9.792×10 -5 |
| Intake valve is opened discrete magnitude conditioning circuit fault fully | 0.9793 | 1.959×10 -4 |
| The complete closure sensor fault of intake valve | 0.9792 | 9.792×10 -5 |
| Intake valve is closed discrete magnitude conditioning circuit fault fully | 0.9793 | 1.959×10 -4 |
| The intake valve actuator is stuck | 0.9796 | 4.898×10 -4 |
| Intake valve is opened the drive circuit fault | 0.98 | 9.8×10 -4 |
| The sample circuit fault | 0.984 | 4.92×10 -3 |
| IC Intake Valve Closes drive circuit fault | 0.98 | 9.8×10 -4 |
| Load short circuits | 0.981 | 1.96×10 -3 |
| Logic breaking circuit fault | 0.982 | 2.95×10 -3 |
| Load cut-off | 0.987 | 7.89×10 -3 |
| Hydraulic system is under-voltage | 0.9794 | 4.89×10 -3 |
| The PTU fault | 0.9841 | 2.95×10 -4 |
According to above analysis, detect by fault coefficient value order from big to small, thereby improve the fault diagnosis hit rate, reduce the test job amount.The Breakdown Maintenance flow process of this auxiliary power unit intake valve assembly that draws sees Table 6
Table 6 Breakdown Maintenance flow process
Can use the ground maintenance machine to check the fault of record.
When safeguarding, can obtain the fault coefficient in conjunction with fault diagnosis according to the fault that system quotes and formulate the troubleshooting flow process, can improve maintenance and troubleshooting efficient.
Claims (8)
1. the control system of intake valve assembly in the auxiliary power unit comprises being used for the intake valve excitation control circuit that system debug is fixed a breakdown, and it is characterized in that:
Described intake valve excitation control circuit comprises open the door control signal and pass gate control signal drive circuit and driving current and overcurrent supervisory circuit;
The described control signal and close the gate control signal drive circuit of opening the door, when open the door order and the order of closing the door took place simultaneously, the assurance order of opening the door had preference through AND NOT gate logic for the two.
2. according to the control system of intake valve assembly in the described auxiliary power unit of claim 1, it is characterized in that:
The described control signal of opening the door is the order discrete signal that opens the door, and closing gate control signal is the order discrete signal of closing the door;
The input signal of described intake valve excitation control circuit comprises the order discrete signal that opens the door, the order discrete signal of closing the door, door actuating signal and door driving current signal;
The output signal of described intake valve excitation control circuit comprise open the door drive excitation pulse, closing the door drives excitation pulse, gate drive voltage monitoring, the monitoring of door driving current, door and drove flow monitoring and the gate current signal that unrolls;
The described control signal and closing in the gate control signal drive circuit of opening the door when open the door the order discrete signal and the order discrete signal of closing the door take place simultaneously, has preference by the AND NOT gate logic order discrete signal of determining to open the door.
The control system of intake valve assembly also comprises the fault tree model that is used to improve the fault diagnosis hit rate in the described auxiliary power unit; Described driving current and overcurrent supervisory circuit output fault recording, the fault point contrast of fault recording and fault tree model, fault location.
3. according to the control system of intake valve assembly in claim 1 or the 2 described auxiliary power units, it is characterized in that: the foundation of described fault tree model may further comprise the steps:
1] define system fault and set up fault tree;
2] by analysis and laboratory data, draw each incident probability of happening to this accessory power system intake valve assembly;
3] draw probability importance degree and fault coefficient by each incident probability of happening;
4] according to the ordering of fault coefficient magnitude, determine the Breakdown Maintenance flow process.
4. according to the control system of intake valve assembly in the described auxiliary power unit of claim 3, it is characterized in that: the described order discrete signal that opens the door is the command signal that control intake valve that processor sends is opened; The described order discrete signal of closing the door is the command signal of the control IC Intake Valve Closes that sends of processor; Described door actuating signal is to be used for the enter signal of excitation control circuit of initialization; Described door driving current signal is a control sampling resistor feedback, is used to reflect the size of driving current; Whether the described driving excitation pulse of opening the door is a control high-power FET road break-make, control the driving voltage that opens the door and export; The described driving excitation pulse of closing the door is a control high-power FET road break-make, and whether control pass gate drive voltage is exported; Described gate drive voltage supervisory signal is whether the monitoring drive circuit drives intake valve, has driving voltage output then to be high level; Whether the monitoring drive circuit drives intake valve during described driving current supervisory signal, has driving current output then to be high level; It is whether overcurrent of monitoring intake valve drive circuit that described door drives the overcurrent supervisory signal, and overcurrent then is a high level; The described gate current signal that unrolls is the size that is used to reflect driving current.
5. according to the control system of intake valve assembly in the described auxiliary power unit of claim 4, it is characterized in that: in described open the door control signal and the pass gate control signal drive circuit, when the order discrete signal that opens the door is high level HI, the switch triode V1 conducting of setovering, produce voltage U 1 by resistance R 34, drive the FET power tube, light idol V61 is controlled at the FET power tube is disconnected; Described voltage U 1 is to be combined into the line delay deglitch by resistance R 36 and capacitor C 11; When the command signal of opening the door was low level LO, the order of closing the door can be passed through the AND NOT gate logic, makes switch triode V2 conducting; Produce voltage U 2 through resistance R 38, U2=U1 drives the FET power tube, and light idol V62 is controlled at the FET power tube is disconnected; Described voltage U 2 is through resistance R 40 and capacitor C 12 combinatorial delays deglitch.
6. according to the control system of intake valve assembly in the described auxiliary power unit of claim 5, it is characterized in that: a precision resistance is set between the power supply of described driving current and overcurrent supervisory circuit and the exciting circuit, pressure drop on the precision resistance, promptly the door driving current signal is connected with amplifier; Described amplifier is imported at in-phase end by two divider resistances respectively, and two divider resistances are imported at backward end in addition; The exciting current that described exciting circuit the produces signal that unrolls is passed to A/D converter as ratio-voltage; The output voltage of described amplifier is the corresponding 0.1V voltage of every 1A exciting current.
7. according to the control system of intake valve assembly in the described auxiliary power unit of claim 6, it is characterized in that: institute's exciting current signal that unrolls also is connected with comparator; Described comparator comprises the first comparator N4A and the second comparator N4B, when electric current greater than 0.5V, when the first comparator N4A out gate current monitoring discrete magnitude was high, expression had driving current work; When electric current greater than 10A, the second comparator N4B out gate is crossed the flow monitoring discrete magnitude when being high, the expression overcurrent; During the door driven, the gate drive voltage that opens the door/close by high power valve output on the motherboard also feeds back to this function module, provide gate drive voltage monitoring discrete magnitude by dividing potential drop and mu balanced circuit, its type is a Transistor-Transistor Logic level, if then represent to have gate drive voltage output during high level; During overcurrent, this is crossed the flow monitoring discrete magnitude and drives light idol V61, light idol V62 by d type flip flop D2A and make the opening-closing door excitation pulse become 28V from 13V to make that high power valve disconnects on the motherboard, thereby shutoff door drives output.
8. according to the control system of intake valve assembly in the described auxiliary power unit of claim 7, it is characterized in that: described precision resistance is 0.1 Ω, is used to guarantee precision; The power supply of driving current and overcurrent supervisory circuit is+28V; Voltage U 1 is+13V with voltage U 2.
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| CN111645866A (en) * | 2020-05-27 | 2020-09-11 | 中国航空工业集团公司西安航空计算技术研究所 | Auxiliary power device air inlet valve control system and method |
| CN111645866B (en) * | 2020-05-27 | 2023-05-09 | 中国航空工业集团公司西安航空计算技术研究所 | Auxiliary power device air inlet valve control system and method |
| CN112487711A (en) * | 2020-11-25 | 2021-03-12 | 江苏科技大学 | AltaRica fault tree generation method and system based on probability distribution |
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| Publication number | Publication date |
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| CN101737182A (en) | 2010-06-16 |
| CN101922365B (en) | 2013-11-20 |
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