CN113479333A - Miniature turbojet engine control system - Google Patents
Miniature turbojet engine control system Download PDFInfo
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- CN113479333A CN113479333A CN202110935636.5A CN202110935636A CN113479333A CN 113479333 A CN113479333 A CN 113479333A CN 202110935636 A CN202110935636 A CN 202110935636A CN 113479333 A CN113479333 A CN 113479333A
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- 239000007858 starting material Substances 0.000 claims description 12
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 99
- 230000005669 field effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- RZVHIXYEVGDQDX-UHFFFAOYSA-N 9,10-anthraquinone Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 RZVHIXYEVGDQDX-UHFFFAOYSA-N 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010152 pollination Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D31/00—Power plant control systems; Arrangement of power plant control systems in aircraft
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Abstract
Disclosed herein is a micro turbojet engine control system comprising: the device comprises a control module, an oil pump driving module and a motor rotating speed measuring module; the oil pump driving module comprises a motor driving unit and an induced electromotive force discharge unit; the motor rotating speed measuring module is configured to measure the rotating speed of the oil pump motor through a speed measuring sensor; the control module is configured to adjust a target rotating speed according to rotating speed information of the oil pump motor, generate a first PWM signal and output the first PWM signal to the oil pump driving module; the motor driving unit is configured to output a voltage driving signal to a voltage input terminal of the oil pump motor when the first PWM signal is a first level signal, and stop outputting when the first PWM signal is a second level signal; the induced electromotive force discharge unit is configured to discharge a voltage on a voltage input terminal of the oil pump motor when the first PWM signal is the second level signal. The scheme can improve the sensitivity and the accuracy of oil pump control.
Description
Technical Field
The embodiment of the application relates to the field of engine control, in particular to a miniature turbojet engine control system.
Background
The unmanned aerial vehicle has a wide application field, for example, data can be collected for meteorological monitoring, traffic flow monitoring, disaster prediction and the like, agricultural spraying, auxiliary pollination and agricultural condition monitoring can be realized in the agricultural field, and disaster rescue and the like can be carried out.
The heart of the drone is the engine. At present, a turbojet engine for civil unmanned aerial vehicles is a miniature turbojet engine with the thrust range of 40-100 kilograms, the engine is driven to a certain rotating speed by controlling a starting motor, a hot fire head and an oil pump are started, and kerosene is ignited by the hot fire head to complete the ignition process. And in the running process, the starting motor and the hot fire head are closed, the voltage at the two ends of the oil pump is controlled by the controller to realize different rotating speeds of the oil pump motor so as to finish different oil supply quantities, and the engine is controlled to enter different running states.
The oil pump control circuit generally controls the MOS tube to open and close by changing a duty ratio of a PWM (Pulse width modulation) wave to adjust the rotation speed of the oil pump motor, which directly affects the oil output of the oil pump. Because the oil pump motor is an inductive load and has inductive counter electromotive force, dead zones exist in the control of the oil pump motor, and the control range is reduced.
Disclosure of Invention
The embodiment of the application provides a miniature turbojet engine control system, includes: the device comprises a control module, an oil pump driving module and a motor rotating speed measuring module; the oil pump driving module comprises a motor driving unit and an induced electromotive force discharge unit;
the motor rotating speed measuring module is configured to measure the rotating speed of the oil pump motor through a speed measuring sensor;
the control module is configured to acquire rotating speed information of the oil pump motor from the motor rotating speed measuring module, adjust the target rotating speed of the oil pump motor according to the rotating speed information, generate a first Pulse Width Modulation (PWM) signal according to the adjusted target rotating speed and output the first PWM signal to the oil pump driving module;
the motor driving unit is configured to output a voltage driving signal to a voltage input end of the oil pump motor when the input first PWM signal is a first level signal; when the input first PWM signal is a second level signal, a voltage driving signal is not output to a voltage input end of the oil pump motor;
the induced electromotive force discharge unit is configured to discharge the voltage on the voltage input end of the oil pump motor when the input first PWM signal is a second level signal; wherein one of the first level and the second level is a high level and the other is a low level.
The control system of the micro turbojet engine comprises a control module, an oil pump driving module and a motor rotating speed measuring module, wherein the control module acquires rotating speed information of an oil pump motor from the motor rotating speed measuring module, adjusts the target rotating speed of the oil pump motor according to the rotating speed information, generates a first PWM signal according to the adjusted target rotating speed and outputs the first PWM signal to the oil pump driving module; when the first PWM signal is the second level signal, the voltage input end of the oil pump motor is not input with a driving voltage signal, and the induced electromotive force relief unit is arranged, so that the voltage on the voltage input end of the oil pump motor can be timely relieved when the input first PWM signal is the second level signal, the influence of the induced electromotive force of the oil pump motor on the rotation speed control of the oil pump motor is reduced, the sensitivity of the rotation speed control of the oil pump motor is increased, and the sensitivity of the oil pump oil outlet control is increased because the rotation speed of the oil pump motor directly influences the oil outlet quantity of the oil pump. And, control the oil pump motor through the rotational speed of real-time supervision oil pump motor, can improve the precision of oil pump control.
Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a schematic diagram of a micro turbojet engine control system according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of another micro turbojet engine control system in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a starter motor drive module according to an embodiment of the present application;
FIG. 4 is a schematic view of a thermal fire head drive module according to an embodiment of the present application;
fig. 5 is a schematic diagram of an oil pump motor driving module according to an embodiment of the present application.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the appended claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the appended claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
As shown in fig. 1, an embodiment of the present application provides a micro turbojet engine control system, including: the system comprises a control module 10, an oil pump driving module 20 and a motor rotating speed measuring module 30; the oil pump driving module comprises a motor driving unit 201 and an induced electromotive force discharge unit 202;
the motor rotating speed measuring module is configured to measure the rotating speed of the oil pump motor through a speed measuring sensor;
the control module is configured to acquire rotating speed information of the oil pump motor from the motor rotating speed measuring module, adjust the target rotating speed of the oil pump motor according to the rotating speed information, generate a first Pulse Width Modulation (PWM) signal according to the adjusted target rotating speed and output the first PWM signal to the oil pump driving module;
the motor driving unit is configured to output a voltage driving signal to a voltage input end of the oil pump motor when the input first PWM signal is a first level signal; when the input first PWM signal is a second level signal, a voltage driving signal is not output to a voltage input end of the oil pump motor;
the induced electromotive force discharge unit is configured to discharge the voltage on the voltage input end of the oil pump motor when the input first PWM signal is a second level signal; wherein one of the first level and the second level is a high level and the other is a low level.
The control system of the micro turbojet engine provided by the embodiment comprises a control module, an oil pump driving module and a motor rotating speed measuring module; the motor rotating speed measuring module is configured to measure the rotating speed of the oil pump motor through a speed measuring sensor; the control module is configured to acquire rotating speed information of the oil pump motor from the motor rotating speed measuring module, adjust the target rotating speed of the oil pump motor according to the rotating speed information, generate a first PWM signal according to the adjusted target rotating speed and output the first PWM signal to the oil pump driving module; the oil pump driving module comprises a motor driving unit and an induced electromotive force discharge unit, wherein the motor driving unit is configured to output a voltage driving signal to a voltage input end of the oil pump motor when an input first PWM signal is a first level signal, and not output the voltage driving signal to the voltage input end of the oil pump motor when the input first PWM signal is a second level signal. When the first PWM signal is the second level signal, the voltage input terminal of the oil pump motor does not have a driving voltage signal input, and since the oil pump motor belongs to an inductive load, an induced electromotive force is generated at the voltage input terminal of the oil pump motor, and if the induced electromotive force cannot be dissipated quickly, the control of the oil pump motor is delayed and cannot be controlled accurately. This application is through setting up the induced electromotive force unit of releasing, can in time release when the first PWM signal of input is second level signal voltage on the voltage input end of oil pump motor to alleviate the influence of the induced electromotive force of oil pump motor to oil pump motor rotational speed control, increase the sensitivity of oil pump motor rotational speed control, because the rotational speed of oil pump motor directly influences the play oil quantity of oil pump, consequently increased the sensitivity of oil pump control of producing oil. And, control the oil pump motor through the rotational speed of real-time supervision oil pump motor, can improve the precision of oil pump control. The miniature turbojet engine control system that this embodiment provided uses on unmanned aerial vehicle, can improve unmanned aerial vehicle's flight control precision for unmanned aerial vehicle's control trajectory in flight control is more accurate.
In some exemplary embodiments, as shown in fig. 2, the micro turbojet engine control system further includes: starting a motor driving module;
the control module is also configured to send a second PWM signal to the starting motor driving module;
and the starting motor driving module is configured to control the rotating speed of the starting motor according to the input second PWM signal.
In the related art, the power of the starting motor is high (for example, between 200 and 1000W), the controller drives the relay to indirectly control the starting of the starting motor, and the current of the starting motor is too high at the starting moment, so that the starting motor and the power supply battery are damaged to a certain extent. This application embodiment sends second PWM signal through control module to starter motor drive module, because the rotational speed of PWM signal can accurate control motor, therefore can realize starter motor's slow start for starter motor's rotational speed rises gradually, avoids starter motor too high at the starting instantaneous electric current, thereby protection starter motor and power supply battery. The miniature turbojet engine control system that this embodiment provided uses on unmanned aerial vehicle, can protect starter motor and power supply battery to the life-span of extension unmanned aerial vehicle engine.
In some exemplary embodiments, as shown in fig. 2, the micro turbojet engine control system further includes: a hot fire head driving module;
a control module further configured to send a third PWM signal to the thermal fire head driving module;
and the hot fire head driving module is configured to control the power supply voltage output to the hot fire head according to the input third PWM signal.
The hot fire head is made of silicon carbide, and the kerosene is ignited by the light emitting and the heating of the hot fire head after a certain voltage is applied to the two ends. In the related art, the controller drives the relay to realize power supply at two ends of the hot fire head so as to complete ignition work. The resistance value of the silicon carbide is obviously increased when the silicon carbide is transited from low temperature to high temperature, so that the resistance value is low and the current is large at the initial working stage of the thermal fire head, the impact on a battery is large, the temperature is rapidly changed due to overlarge current, the temperature impact on the thermal fire head is also caused, and the thermal fire head is easy to damage and the service life is shortened. This application embodiment sends third PWM signal to hot fire head drive module through control module, because the PWM signal can accurate control provide the supply voltage's that gives the hot fire head size, therefore can realize that the temperature of hot fire head rises gradually, avoids hot fire head at power-on instantaneous current too high to protect hot fire head and power supply battery. The miniature turbojet engine control system that this embodiment provided uses on unmanned aerial vehicle, can protect hot flame head and power supply battery to the life-span of extension unmanned aerial vehicle engine.
In some exemplary embodiments, the first PWM signal is a PWM signal with a varying duty cycle. The duty ratio of the first PWM signal has an incidence relation with the driving voltage for driving the oil pump motor to rotate, and the driving voltage for driving the oil pump motor to rotate can be changed by changing the duty ratio of the first PWM signal, so that the rotating speed of the oil pump motor is changed.
In some exemplary embodiments, the second PWM signal is a PWM signal with an adjustable duty cycle; the duty ratio of the second PWM signal is gradually increased until reaching a first preset threshold value. The duty ratio of the second PWM signal has an incidence relation with the driving voltage for driving the starting motor to rotate, and the driving voltage for driving the starting motor to rotate can be changed by changing the duty ratio of the second PWM signal, so that the rotating speed of the starting motor is changed. The duty ratio of the second PWM signal is gradually increased, so that the starting motor can be started slowly, the rotating speed of the starting motor is gradually increased, the starting motor is prevented from being overhigh in current at the starting moment, and the starting motor and a power supply battery are protected.
In some exemplary embodiments, the third PWM signal is a PWM signal with an adjustable duty cycle; the duty cycle of the third PWM signal is gradually increased up to a second preset threshold. The duty ratio of the third PWM signal has an incidence relation with the power supply voltage of the hot fire head, and the power supply voltage of the hot fire head can be changed by changing the duty ratio of the third PWM signal. Through the duty cycle that makes the third PWM signal crescent, can realize that the temperature of hot flame rises gradually, avoids hot flame to be in the power-on too high electric current in the twinkling of an eye to protection hot flame and power supply battery.
In some exemplary embodiments, as shown in fig. 3, the starter motor driving module includes: the first switch tube driving unit U1, the first resistor R1 and the first switch tube M1;
the first switching tube driving unit comprises an input end and an output end, and is configured to amplify a second PWM signal input by the input end and output the amplified second PWM signal to the output end;
the first switch tube comprises a control pole, a first pole and a second pole; the control electrode of the first switch tube is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the first switch tube driving unit; a first pole of the first switching tube is connected with a first voltage input end of the starting motor MT 1; the second pole of the first switch tube is grounded; one of the first pole and the second pole of the first switch tube is a source electrode, and the other one is a drain electrode; and a second voltage input end of the starting motor is connected with the anode of the battery, and the cathode of the battery is grounded. One of the first voltage input terminal and the second voltage input terminal of the starter motor is a high level input terminal, and the other is a low level input terminal. Fig. 3 shows that the first voltage input of the starter motor is a low input and the second voltage input of the starter motor is a high input.
In some exemplary embodiments, the first switching tube M1 includes: a high-power field effect transistor (metal-oxide semiconductor field effect transistor, abbreviated as MOS transistor). For example, MOS transistor IRF3205 may be used as the first switching transistor.
In some exemplary embodiments, the first switching tube driving unit U1 may adopt a dedicated MOS tube driving chip. For example, a MOS transistor is used to drive the chip IRS 44262S.
Taking the first switch tube as an example, which is an N-type MOS tube that is turned on at a high level and turned off at a low level, when the second PWM signal is a high level signal, the first switch tube is turned on, the first voltage input terminal of the start motor is grounded, the power supply loop of the start motor is turned on, and the start motor is turned on; when the second PWM signal is a low level signal, the first switch tube is cut off, the first voltage input end of the starting motor is in floating connection, the power supply loop of the starting motor is disconnected, and the starting motor is powered off. The length of the power supply time of the starting motor can be changed through the change of the duty ratio of the second PWM signal, so that the rotating speed of the starting motor is changed.
In some exemplary embodiments, as shown in fig. 4, the hot fire head driving module includes: the second switch tube driving unit U2, the second resistor R2 and the second switch tube M2;
the second switching tube driving unit comprises an input end and an output end, and is configured to amplify a third PWM signal input by the input end and output the amplified third PWM signal to the output end;
the second switch tube comprises a control pole, a first pole and a second pole; the control electrode of the second switch tube is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output end of the second switch tube driving unit; the first pole of the second switching tube is connected with the first voltage input end of the hot fire head SP 1; a second pole of the second switch tube is grounded; one of the first pole and the second pole of the second switch tube is a source electrode, and the other is a drain electrode; and a second voltage input end of the hot fire head is connected with the anode of the battery, and the cathode of the battery is grounded. One of the first voltage input end and the second voltage input end of the thermal fire head is a high level input end, and the other one of the first voltage input end and the second voltage input end of the thermal fire head is a low level input end. In fig. 4, it is shown that the first voltage input of the thermal fire head is a low level input and the second voltage input of the thermal fire head is a high level input.
In some exemplary embodiments, the second switching tube M2 includes: a high power field effect transistor. For example, MOS transistor IRF3205 may be used as the second switching transistor.
In some exemplary embodiments, the second switching tube driving unit U2 may adopt a dedicated MOS tube driving chip. For example, a MOS transistor is used to drive the chip IRS 44262S.
Taking the second switch tube as an example, which is an N-type MOS tube that is turned on at a high level and turned off at a low level, when the third PWM signal is a high level signal, the second switch tube is turned on, the first voltage input terminal of the hot flame head is grounded, the power supply loop of the hot flame head is turned on, the hot flame head is powered on, and the temperature of the hot flame head rises; when the third PWM signal is a low level signal, the second switch tube is cut off, the first voltage input end of the hot fire head is in floating connection, the power supply loop of the hot fire head is disconnected, and the hot fire head is powered off. The length of the power supply time of the hot fire head can be changed through the change of the duty ratio of the third PWM signal, so that the temperature rising speed of the hot fire head is changed.
In some exemplary embodiments, the tachometer sensor includes: an electromagnetic sensor or a hall sensor. For example, a high-sensitivity magnetic sensor KMZ10A may be used, which converts a magnetic field intensity varying with rotation of a motor shaft into a sinusoidally varying voltage and outputs the voltage.
In some exemplary embodiments, as shown in fig. 5, the oil pump driving module includes: a half-bridge switch circuit driving unit U3, a third resistor R3, a fourth resistor R4, a third switch tube M3 and a fourth switch tube M4;
the half-bridge switching circuit driving unit comprises an input end, a first output end HO and a second output end LO, and is configured to amplify a first PWM signal input by the input end, output a PWM output signal in phase with the first PWM signal at the first output end, and output a PWM output signal in phase opposite to the first PWM signal at the second output end; that is, when the first PWM signal is at a high level, the first output terminal outputs a high level signal, and the second output terminal outputs a low level signal; when the first PWM signal is at low level, the first output end outputs a low level signal, and the second output end outputs a high level signal;
the third switching tube comprises a control electrode, a first electrode and a second electrode; the control electrode of the third switching tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first output end of the half-bridge switching circuit driving unit; the first pole of the third switching tube is connected with a first power supply signal VDD end; a second pole of the third switching tube is connected with a first voltage input end of the oil pump motor MT 2;
the fourth switch tube comprises a control electrode, a first electrode and a second electrode; a control electrode of the fourth switching tube is connected with a first end of a fourth resistor, and a second end of the fourth resistor is connected with a second output end of the half-bridge switching circuit driving unit; a first pole of the fourth switching tube is connected with a first voltage input end of the oil pump motor MT2, and a second pole of the fourth switching tube is grounded; a second voltage input end of the oil pump motor is grounded;
one of the first voltage input end and the second voltage input end of the oil pump motor is a high level input end, and the other one of the first voltage input end and the second voltage input end is a low level input end. Fig. 5 shows that the first voltage input terminal of the oil pump motor is a high level input terminal, and the second voltage input terminal of the oil pump motor is a low level input terminal.
In some exemplary embodiments, the first power signal VDD is a power supply voltage signal obtained by isolating a voltage signal provided by a battery.
In some exemplary embodiments, the third and fourth switching tubes include: a high power field effect transistor. For example, MOS transistors IRF3205 may be used as the third switching transistor and the fourth switching transistor.
In some exemplary embodiments, the half-bridge switching circuit driving unit U3 may employ a dedicated half-bridge MOS transistor driving chip. For example, by adopting the half-bridge MOS transistor driving chip IR2104, a single PWM wave input can be realized to drive two MOS transistors. The working states of the two MOS tubes can be different, and one MOS tube is conducted and the other MOS tube is cut off.
The working process of the oil pump driving module is described by taking the third switching tube and the fourth switching tube as the example, which are both the N-type MOS tubes with the high level turned on and the low level turned off.
When the first PWM signal is a high level signal, the first output terminal of the half-bridge switch circuit driving unit outputs the high level signal, the third switch tube is turned on, the voltage of the second pole of the third switch tube is the voltage of the first power supply signal VDD, the first voltage input terminal of the oil pump motor obtains the first power supply signal, the second voltage input terminal of the oil pump motor is grounded, and the power supply circuit of the oil pump motor is turned on and obtains the power supply voltage. When the first PWM signal is a high level signal, the second output end of the half-bridge switching circuit driving unit outputs a low level signal, and the fourth switching tube is cut off, so that the potential of the first voltage input end of the oil pump motor is not influenced.
When the first PWM signal is a low level signal, the second output terminal of the half-bridge switching circuit driving unit outputs a high level signal, the fourth switching tube is turned on, the first pole of the fourth switching tube is grounded through the conducting channel of the fourth switching tube, because the second voltage input terminal of the oil pump motor is grounded, so a short circuit is formed between the first voltage input terminal and the second voltage input terminal of the oil pump motor, that is, the fourth switching tube is turned on to enable the voltage (including the induced electromotive force of the oil pump motor) on the first voltage input terminal of the oil pump motor to be discharged through the fourth switching tube. When the first PWM signal is a low level signal, the first output end of the half-bridge switch circuit driving unit outputs the low level signal, and the third switch tube is cut off, so that the potential of the first voltage input end of the oil pump motor is not influenced.
When the first PWM signal is a low level signal, the voltage on the voltage input end of the oil pump motor is timely released through the fourth switch tube, so that the influence of induced electromotive force of the oil pump motor on the rotation speed control of the oil pump motor is reduced, the sensitivity of the rotation speed control of the oil pump motor is increased, and the sensitivity of the oil pump oil outlet control is increased because the rotation speed of the oil pump motor directly influences the oil outlet quantity of the oil pump.
It will be appreciated by a person skilled in the art that the functional modules/units in the apparatus disclosed above may be implemented as software, firmware, hardware and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
Claims (10)
1. A micro turbojet engine control system comprising: the device comprises a control module, an oil pump driving module and a motor rotating speed measuring module; the oil pump driving module comprises a motor driving unit and an induced electromotive force discharge unit;
the motor rotating speed measuring module is configured to measure the rotating speed of the oil pump motor through a speed measuring sensor;
the control module is configured to acquire rotating speed information of the oil pump motor from the motor rotating speed measuring module, adjust the target rotating speed of the oil pump motor according to the rotating speed information, generate a first Pulse Width Modulation (PWM) signal according to the adjusted target rotating speed and output the first PWM signal to the oil pump driving module;
the motor driving unit is configured to output a voltage driving signal to a voltage input end of the oil pump motor when the input first PWM signal is a first level signal; when the input first PWM signal is a second level signal, a voltage driving signal is not output to a voltage input end of the oil pump motor;
the induced electromotive force discharge unit is configured to discharge the voltage on the voltage input end of the oil pump motor when the input first PWM signal is a second level signal; wherein one of the first level and the second level is a high level and the other is a low level.
2. The micro turbojet engine control system of claim 1, wherein:
the micro turbojet engine control system further comprises: starting a motor driving module;
the control module is also configured to send a second PWM signal to the starting motor driving module;
and the starting motor driving module is configured to control the rotating speed of the starting motor according to the input second PWM signal.
3. The micro turbojet engine control system of claim 1, wherein:
the micro turbojet engine control system further comprises: a hot fire head driving module;
a control module further configured to send a third PWM signal to the thermal fire head driving module;
and the hot fire head driving module is configured to control the power supply voltage output to the hot fire head according to the input third PWM signal.
4. The micro turbojet engine control system of claim 1, wherein:
the first PWM signal is a PWM signal with a varying duty cycle.
5. The micro turbojet engine control system of claim 2, wherein:
the second PWM signal is a PWM signal with adjustable duty ratio; the duty ratio of the second PWM signal is gradually increased until reaching a first preset threshold value.
6. The micro turbojet engine control system of claim 3, wherein:
the third PWM signal is a PWM signal with adjustable duty ratio; the duty cycle of the third PWM signal is gradually increased up to a second preset threshold.
7. The micro turbojet engine control system of claim 2, wherein:
the starter motor driving module includes: the circuit comprises a first switching tube driving unit, a first resistor and a first switching tube;
the first switching tube driving unit comprises an input end and an output end, and is configured to amplify a second PWM signal input by the input end and output the amplified second PWM signal to the output end;
the first switch tube comprises a control pole, a first pole and a second pole; the control electrode of the first switch tube is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the first switch tube driving unit; a first pole of the first switching tube is connected with a first voltage input end of the starting motor; the second pole of the first switch tube is grounded; one of the first pole and the second pole of the first switch tube is a source electrode, and the other one is a drain electrode; and a second voltage input end of the starting motor is connected with the anode of the battery, and the cathode of the battery is grounded.
8. The micro turbojet engine control system of claim 3, wherein:
the thermal fire head driving module comprises: the second switch tube driving unit, a second resistor and a second switch tube;
the second switching tube driving unit comprises an input end and an output end, and is configured to amplify a third PWM signal input by the input end and output the amplified third PWM signal to the output end;
the second switch tube comprises a control pole, a first pole and a second pole; the control electrode of the second switch tube is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output end of the second switch tube driving unit; the first pole of the second switching tube is connected with the first voltage input end of the hot fire head; a second pole of the second switch tube is grounded; one of the first pole and the second pole of the second switch tube is a source electrode, and the other is a drain electrode; and a second voltage input end of the hot fire head is connected with the anode of the battery, and the cathode of the battery is grounded.
9. The micro turbojet engine control system of any one of claims 1 to 8, wherein:
the oil pump driving module includes: the half-bridge switching circuit comprises a half-bridge switching circuit driving unit, a third resistor, a fourth resistor, a third switching tube and a fourth switching tube;
the half-bridge switching circuit driving unit comprises an input end, a first output end and a second output end, and is configured to amplify a first PWM signal input by the input end, output a PWM output signal in phase with the first PWM signal at the first output end, and output a PWM output signal in phase opposite to the first PWM signal at the second output end;
the third switching tube comprises a control electrode, a first electrode and a second electrode; the control electrode of the third switching tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first output end of the half-bridge switching circuit driving unit; the first pole of the third switching tube is connected with a first power signal end; the second pole of the third switching tube is connected with the first voltage input end of the oil pump motor;
the fourth switch tube comprises a control electrode, a first electrode and a second electrode; a control electrode of the fourth switching tube is connected with a first end of a fourth resistor, and a second end of the fourth resistor is connected with a second output end of the half-bridge switching circuit driving unit; a first pole of the fourth switch tube is connected with a first voltage input end of the oil pump motor, and a second pole of the fourth switch tube is grounded; and a second voltage input end of the oil pump motor is grounded.
10. The micro turbojet engine control system of claim 9, wherein:
the half-bridge switching circuit driving unit adopts a special half-bridge MOS tube driving chip.
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| CN207182036U (en) * | 2017-09-16 | 2018-04-03 | 南京全控航空科技有限公司 | Control system for turbojet engine |
| CN113236428A (en) * | 2021-07-09 | 2021-08-10 | 清航空天(北京)科技有限公司 | Turbojet engine |
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| CN102213151A (en) * | 2011-05-17 | 2011-10-12 | 遵义天义利威机电有限责任公司 | Controller of non-position sensor direct current brushless electric fuel pump for automobile |
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| CN113479333B (en) | 2022-03-04 |
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