Power fuel oil control device

Abstract

The utility model discloses a power fuel oil control device. The power fuel oil control device comprises an input unit, an output unit and a single chip microcomputer master control circuit. The power fuel oil control device completes manual and automatic control over a fuel oil transfer pump and automatic control over a standby fuel oil pump and outputs corresponding alarm signals by collecting fuel oil quantity data, fuel oil flow data, engine CAN data and control device state parameters and adopting a specific algorithm formula and logic judgment. On the premise that the system requirement is met, the workload of a pilot is greatly reduced, meanwhile, the safety of the system can be improved, and the intelligent level of an aircraft is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft electromechanical systems, and in particular relates to a power fuel control device. Background Art

[0002] A newly developed aircraft uses a Rotax engine. Different from the traditional mechanical engine control system, this engine is equipped with an engine electronic control system (EEC). The fuel system of the newly developed aircraft is designed with left and right fuel tanks and a collecting tank. The collecting tank supplies fuel to the engine, the left fuel tank supplies fuel to the collecting tank, and the right fuel tank supplies fuel to the left fuel tank through a transfer pump. The current engine electronic control system lacks control over the fuel transfer pump; the current engine electronic control system also lacks control over the standby fuel pump, resulting in hidden dangers to the safety of the engine system. In addition, the current engine electronic control system also lacks a fuel alarm device. Utility Model Content

[0003] In order to realize the control of the fuel transfer pump by the electronic control system of the new aircraft, the redundant control of the backup function of the new engine, that is, the automatic control of the backup fuel pump, the channel B backup power supply and the automatic output of the fuel alarm, the utility model provides a power fuel control device, including:

[0004] Input unit: power supply circuit, fuel transfer pump switch circuit, left and right fuel quantity circuits, ignition switch circuit, fuel flow signal circuit, CAN bus circuit, dimming control signal circuit,

[0005] Output unit: fuel transfer pump control circuit, standby fuel pump and channel B standby power control circuit, fuel system fault circuit, indicator light control circuit,

[0006] Single chip microcomputer master control circuit;

[0007] Among them, the output end of the power supply circuit is connected to the first port of the single-chip computer, the output end of the fuel transfer pump switch circuit is respectively connected to the fifth port, the sixth port, and the seventh port of the single-chip computer, the output ends of the left and right fuel quantity circuits are connected to the twelfth port and the twenty-sixth port of the single-chip computer, the output end of the ignition switch circuit is connected to the fourteenth port of the single-chip computer, the fuel flow signal circuit is connected to the twenty-third port, and the input end of the CAN bus circuit is connected to the twenty-fourth port and the twenty-fifth port of the single-chip computer;

[0008] The input ends of the fuel transfer pump control circuit are respectively connected to the fifth port, the third port, and the seventh port of the single-chip computer; the input ends of the engine standby fuel pump on / off and the engine channel B standby power on / off control circuits are connected to the sixteenth port and the seventeenth port of the single-chip computer; the input end of the fuel system fault circuit is connected to the twenty-first port of the single-chip computer; and the input end of the fuel transfer pump indicator light control circuit is connected to the thirteenth port of the single-chip computer.

[0009] Optionally, the fuel transfer pump switch circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifteenth capacitor, a sixteenth capacitor, and a seventeenth capacitor, wherein the fifth resistor, the sixth resistor, and the seventh resistor are respectively connected to the OFF gear, the AUTO gear, and the ON gear of the switch S1 gear, the eighth resistor is connected in parallel between the AUTO gear of the switch S1 gear and the ground wire, and the fifteenth capacitor, the sixteenth capacitor, and the seventeenth capacitor are respectively connected in parallel between the OFF gear, the AUTO gear, the ON gear of the switch S1 gear and the ground wire.

[0010] Optionally, the left and right fuel quantity circuits include a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighteenth capacitor, a seventh diode, an eighth diode, a ninth diode, a tenth diode, a first amplifier, and a second amplifier, wherein one end of the ninth resistor and the tenth resistor are connected to the left and right fuel quantity input ends of the sensor, and one end is respectively connected to the positive input ends of the first amplifier and the second amplifier, the eleventh resistor and the twelfth resistor are respectively connected to the negative input ends of the first amplifier and the second amplifier, and one end is respectively connected to the output ends of the first amplifier and the second amplifier, the seventh diode and the eighth diode are connected in series with the anode grounded and the cathode connected to the power supply, the ninth diode and the tenth diode are connected in series with the anode grounded and the cathode connected to the power supply, the positive input end of the first amplifier is connected to the ninth resistor, the cathode of the eighth diode, and the anode of the seventh diode, the positive input end of the second amplifier is connected to the tenth resistor, the cathode of the eleventh diode, and the anode of the ninth diode, the negative input ends of the first amplifier and the second amplifier are respectively connected to the eleventh resistor and the twelfth resistor, and the output ends are respectively connected to the left and right fuel quantity output signal ends.

[0011] Optionally, the fuel flow signal circuit includes: a twenty-fifth resistor, a fifteenth diode, and a sixteenth diode, wherein one end of the twenty-fifth resistor is connected to the fuel flow signal input end, and the other end is connected to the fuel flow signal output end, the anode of the fifteenth diode, and the cathode of the sixteenth diode, the anode of the sixteenth diode is grounded, the cathode of the sixteenth diode is connected to the anode of the fifteenth diode, the fuel flow signal output end, and the twenty-fifth resistor, the cathode of the fifteenth diode is connected to the power supply, and the anode of the fifteenth diode is connected to the fuel flow signal output end, the cathode of the sixteenth diode, and the twenty-fifth resistor.

[0012] Optionally, the fuel transfer pump control circuit includes a first protection device, a fifth chip, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, an eleventh diode, a twelfth diode, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, and a twenty-second capacitor, wherein one end of the first protection device is connected to the 28VDC power input terminal and one end is connected to the first input terminal of the fifth chip, the second port of the fifth chip is connected to the first protection device, the fourth port is connected to the source of the fourth field effect transistor, and the The fifth port is grounded, the sixth port is connected to the twenty-first resistor and the twenty-second resistor, the eighth output terminal is connected to the power supply, the twelfth diode and the twenty-third capacitor are connected in parallel, one end is connected to the drain of the fourth field effect transistor, and the other end is grounded, the eleventh diode and the nineteenth capacitor are connected in parallel, the anode of the tenth diode is connected to the gate of the fourth field effect transistor, the cathode of the eleventh diode is connected to the source of the fourth field effect transistor, one end of the twenty-second capacitor is grounded, and one end is connected to the aircraft ground wire, one end of the twenty-first capacitor is connected to the drain of the fourth field effect transistor, and one end is connected to the aircraft ground wire, the gate of the first field effect transistor is connected to the sixteenth resistor and the seventeenth resistor, the source is grounded, and the drain is connected to the gate of the second field effect transistor, and the gate of the second field effect transistor is connected to the first field The drain of the effect tube, the fourteenth resistor, the fifteenth resistor, the source is grounded, the drain is connected to the nineteenth resistor, the gate of the third field effect transistor is connected to the transfer pump open signal input terminal and the thirteenth resistor, the source is grounded, the drain is connected to the eighteenth resistor, the gate of the fourth field effect transistor is connected to the anode of the eleventh diode, the nineteenth capacitor, the eighteenth resistor and the twentieth resistor, the source is connected to the fourth port of the fifth chip, the cathode of the eleventh diode, the nineteenth capacitor, the drain is connected to the signal output terminal, the twentieth capacitor, the twenty-first capacitor, the twelfth diode, one end of the thirteenth resistor is grounded, and one end is connected to the gate of the third field effect transistor, one end of the fourteenth resistor is grounded, and one end is connected to the gate of the second field effect transistor, and one end of the fifteenth resistor is connected to the transfer pump open / close One end of the sixteenth resistor is connected to the transfer pump off signal input terminal, and the other end is connected to the gate of the first field effect transistor. One end of the seventeenth resistor is connected to ground, and the other end is connected to the gate of the first field effect transistor. One end of the twentieth resistor is connected to the 28VDC power supply input terminal, and the other end is connected to the gate of the fourth field effect transistor. One end of the eighteenth resistor is connected to the source of the fourth field effect transistor, and the other end is connected to the drain of the third field effect transistor. One end of the nineteenth resistor is connected to the drain of the second field effect transistor, and the other end is connected to the source of the fourth field effect transistor. One end of the twenty-first resistor is connected to the sixth output terminal of the fifth chip, and one end is connected to the power supply. One end of the twenty-second resistor is connected to the sixth output terminal of the fifth chip, and one end is grounded.

[0013] Optionally, the backup fuel pump and channel B backup power supply control circuit includes a first photocoupler, a second photocoupler, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a seventeenth diode, and an eighteenth diode, wherein the first input end of the first photocoupler is connected to the power supply, the second input end is connected to the twenty-ninth resistor, the seventh output end is grounded and the anode of the seventeenth diode, the eighth output end is connected to the thirty-first resistor and the cathode of the seventeenth diode, one end of the twenty-ninth resistor is connected to the engine backup fuel pump on / off control signal input end output by the single-chip microcomputer, one end of the twenty-ninth resistor is connected to the second input end of the first photocoupler, and one end of the 30th resistor is connected to the engine output by the single-chip microcomputer. The 30th resistor is connected to the fourth input terminal of the second photocoupler, one end of the 31st resistor is connected to the eighth output terminal of the first photocoupler, one end of the 31st resistor is connected to the engine standby fuel pump on / off control signal output terminal, one end of the 32nd resistor is connected to the sixth output terminal of the second photocoupler, one end of the 32nd resistor is connected to the engine channel B standby power on / off control signal output terminal, the anode of the 17th diode is connected to the seventh output terminal of the first photocoupler, and the cathode is connected to the eighth output terminal of the first photocoupler, the anode of the 18th diode is connected to the fifth output terminal of the second photocoupler, and the cathode is connected to the sixth output terminal of the second photocoupler.

[0014] In summary, the power fuel control device described in this application has the following advantages:

[0015] 1. This power fuel control device realizes the automatic control of the fuel transfer pump by the aircraft electronic control system based on the ignition switch position status parameters, fuel flow signal, and engine speed through software logic judgment;

[0016] 2. This power fuel control device automatically controls the standby fuel pump according to the ignition switch position status parameters, CAN bus data, and engine speed through software logic judgment;

[0017] 3. This power fuel control device automatically controls the channel B backup power supply according to the ignition switch position status parameters, CAN bus data, and engine speed through software logic judgment;

[0018] 4. This power fuel control device can automatically output each fault signal when there is a fault;

[0019] 5. This power fuel control device can greatly reduce the pilot's workload while meeting system requirements, while increasing the safety of the system and improving the intelligence level of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings are examples of specific implementation methods of the present application:

[0021] Figure 1 This is a functional flow chart of the power fuel control device of the embodiment of the utility model;

[0022] Figure 2 This is a principle block diagram of the technical solution of the power fuel control device of the embodiment of the utility model;

[0023] Figure 3 This is a power supply circuit diagram of the power fuel control device of the embodiment of the utility model;

[0024] Figure 4 This is a three-position switch circuit diagram of a power fuel control device according to an embodiment of the utility model;

[0025] Figure 5 This is a circuit diagram of fuel quantity signals of the left and right fuel tanks of the power fuel control device of the utility model embodiment;

[0026] Figure 6 This is a fuel transfer pump control circuit diagram of the power fuel control device of the utility model embodiment;

[0027] Figure 7 This is a circuit diagram of an ignition switch OFF position signal of a power fuel control device according to an embodiment of the utility model;

[0028] Figure 8 This is a fuel flow signal circuit diagram of a power fuel control device of an embodiment of the utility model;

[0029] Fig. 9 This is a CAN bus control circuit diagram of a power fuel control device according to an embodiment of the utility model;

[0030] Fig.10 This is a single chip microcomputer master control circuit diagram of the power fuel control device of the utility model embodiment;

[0031] Fig.11 This is a control circuit diagram of the engine standby fuel pump on / off and the engine channel B standby power on / off of the power fuel control device of the embodiment of the utility model;

[0032] Fig.12 This is a fault signal output circuit diagram of the power fuel control device of the embodiment of the utility model;

[0033] Fig.13 This is a driving circuit diagram of an indicator light of a power fuel control device according to an embodiment of the utility model;

[0034] Fig.14 This is a dimming control signal circuit diagram of the power fuel control device of the utility model embodiment;

[0035] Fig.15It is a schematic diagram of the software architecture of the power fuel control device of the utility model embodiment. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technology in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. The embodiments of the present invention disclosed in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] The utility model embodiment provides a power fuel control device, the function flow chart is as follows Figure 1 As shown, based on the position of the fuel transfer switch, the transfer pump is manually forced to be closed or opened, or the transfer pump is automatically controlled according to the aircraft fuel status; based on the ignition switch position, engine speed, and fuel flow status, the standby pump is automatically controlled; based on the ignition switch position, engine speed, and engine CAN data status, the engine channel B standby control is automatically controlled; based on the operating status of the transfer pump, an indication lighting for the operation of the transfer pump is provided; based on the operating status of each component of the fuel system, a corresponding fault signal is generated.

[0038] Specifically, the utility model provides a power fuel control device, such as Figure 2 As shown, including:

[0039] Input unit: power supply circuit, fuel transfer pump switch circuit, left and right fuel quantity circuits, ignition switch circuit, fuel flow signal circuit, CAN bus circuit,

[0040] Output unit: fuel transfer pump control circuit, standby fuel pump and channel B standby power control circuit, fuel system fault circuit, indicator light control circuit, dimming control signal circuit,

[0041] Single chip microcomputer master control circuit;

[0042] The input unit includes: a power supply circuit, a left and right fuel quantity circuit, an ignition switch input circuit, a fuel flow signal circuit, a CAN bus circuit, a dimming control signal (frequency), and a fuel transfer pump switch circuit.

[0043] The power supply circuit includes a 28VDC power supply circuit and a standard 5VDC power supply circuit, such as Figure 3As shown, the 28VDC power supply circuit includes: a first diode D1, a second diode D2, a third diode D3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a common mode choke L1, a power inductor L2, and a feed-through capacitor L3, wherein the first diode D1 and the second diode D2 are connected in parallel, the anodes are connected to the 28VDC power supply respectively, the cathodes are connected to the first capacitor C1, the second capacitor C2 and the first port of the common mode choke L1, the third diode D3 and the sixth capacitor C6 are connected in parallel, one end is connected to the second port of the common mode choke L1 and the fifth port of the feed-through capacitor L3, and one end is grounded, one end of the first capacitor C1 is connected to the first diode D1 and the cathode of the first diode, and the other end is grounded, one end of the second capacitor C2 is connected to the first diode D1 and the cathode of the first diode, and the other end is connected to the 28VDC power supply loop, and one end of the third capacitor C3 is connected One end of the third port of the common mode choke L1 is grounded, one end of the fourth capacitor C4 is connected to the fourth port of the common mode choke L1, and one end is grounded, one end of the fifth capacitor C5 is connected to the second port of the common mode choke L1 and the fifth port of the feed-through capacitor L3, and one end is grounded, one end of the sixth capacitor C6 is connected to the second port of the common mode choke L1 and the fifth port of the feed-through capacitor L3, and one end is grounded, the first port of the common mode choke L1 is connected to the first diode D1 and the cathode of the first diode, the second port of the common mode choke L1 is connected to the fifth port of the feed-through capacitor L3, the third port of the common mode choke L1 is connected to the third capacitor C3 and the 28VDC power supply loop, the fourth port of the common mode choke L1 is connected to the fourth capacitor C4 and the fifth port of the feed-through capacitor L3, the power inductor L2 is grounded, the fifth port of the feed-through capacitor L3 is connected to the second port of the common mode choke L1, the sixth port of the feed-through capacitor L3 is grounded, and the seventh port is connected to the 28VDC power supply output end. The power fuel control device obtains 28VDC input from two different power supplies on the aircraft. The two inputs are connected in parallel through a first diode D1 and a second diode D2 respectively and then filtered through a filtering network. The filtering network includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a common mode choke L1, a power inductor L2, and a feed-through capacitor L3. The third diode D3 is a TVS diode to ensure that load voltage transients are suppressed.

[0044] The standard 5VDC power supply circuit includes: a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fourth diode D4, a fifth diode D5, a sixth diode D6, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first adjustable linear regulator U1, and a second adjustable linear regulator U2, wherein one end of the ninth capacitor C9 and the tenth capacitor C10 are respectively connected to two 28VDC power input terminals, one end is grounded, and the tenth capacitor C9 is grounded. One end of the first capacitor C11 and the twelfth capacitor C12 are respectively connected to the fourth input terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2, and one end is grounded. The thirteenth capacitor C13 and the fourteenth capacitor C14 are respectively connected to the eighth output terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2, and one end is grounded. The anodes of the fourth diode D4 and the fifth diode D5 are respectively connected to the two standard 5VDC power supply output terminals, and the cathodes are connected to the anode of the sixth diode D6 and the power supply output terminal. The anode of the sixth diode D6 is connected to the fourth second The cathode of the fifth diode D4 and the cathode of the sixth diode D6 are grounded, the first resistor R1 and the third resistor R3 are connected to the eighth output terminal and the sixth output terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 respectively, one end of the second resistor R2 and the fourth resistor R4 are connected to the sixth output terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2, and one end is grounded, the first ports of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to two 28VDC power supply input terminals respectively, the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to the eighth output terminal and the sixth output terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 respectively, and the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to the eighth output terminal and the sixth output terminal of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 respectively. The fourth ports of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to the eleventh capacitor C11 and the twelfth capacitor C12 respectively, the eighth ports of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to two standard 5VDC power supply output ends respectively, the sixth ports of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are connected to the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 respectively, and the tenth ports of the first adjustable linear regulator U1 and the second adjustable linear regulator U2 are grounded. The processed 28VDC power supply is divided into two inputs, one of which is adjusted to 5VDC_A through the first adjustable linear regulator U1, the first resistor R1, and the second resistor R2, and the other outputs a fixed 5VDC_B through the second adjustable linear regulator U2, the third resistor R3, and the fourth resistor R4, and the output power is VCC.

[0045] Fuel transfer pump switch circuit Figure 4As shown, it includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fifteenth capacitor C15, a sixteenth capacitor C16, and a seventeenth capacitor C17, wherein the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 are respectively connected to the OFF gear, the AUTO gear, and the ON gear of the switch S1, the eighth resistor R8 is connected in parallel between the AUTO gear of the switch S1 and the ground wire, and the fifteenth capacitor C15, the sixteenth capacitor C16, and the seventeenth capacitor C17 are respectively connected in parallel between the OFF gear, the AUTO gear, the ON gear of the switch S1 and the ground wire. When the switch S1 is in the OFF position, the output is to the fifth port of the microcontroller IC1. When the switch S1 is in the ON position, the output is to the seventh port of the microcontroller IC1. When the switch S1 is in the AUTO position, the output is to the sixth port of the microcontroller IC1. The fifth resistor R5 and the fifteenth capacitor C15 realize switch de-bouncing in the OFF position. The sixth resistor R6, the seventh resistor R7, and the sixteenth capacitor C16 realize switch de-bouncing in the AUTO position. The eighth resistor R8 and the seventeenth capacitor C17 realize switch de-bouncing in the ON position.

[0046] Left and right fuel level circuits Figure 5 As shown, it includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, an eighteenth capacitor C18, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, a first amplifier U3, and a second amplifier U4, wherein one end of the ninth resistor R9 and the tenth resistor R10 are connected to the left and right fuel input ends of the sensor, and one end is respectively connected to the positive input end of the first amplifier U3 and the second amplifier U4, the eleventh resistor R11 and the twelfth resistor R12 are respectively connected to the negative input end of the first amplifier U3 and the second amplifier U4, and one end is respectively connected to the output end of the first amplifier U3 and the second amplifier U4, the seventh diode D7 and the eighth diode D8 are connected in series, and the anode is grounded, and the cathode is connected to the power supply, the ninth diode D9 and the tenth diode D10 are connected in series, and the anode is connected to the ground, and the cathode is connected to the power supply, The first amplifier U3 is connected to the ground, the cathode is connected to the power supply, the positive input end of the first amplifier U3 is connected to the ninth resistor R9, the cathode of the eighth diode, and the anode of the seventh diode D7, the positive input end of the second amplifier U4 is connected to the tenth resistor R10, the cathode of the eleventh diode, and the anode of the ninth diode D9, the negative input ends of the first amplifier U3 and the second amplifier U4 are connected to the eleventh resistor R11 and the twelfth resistor R12 respectively, and the output ends are connected to the left and right fuel quantity output signal ends respectively; the left and right fuel quantity circuit inputs are input to the in-phase voltage follower through R9 and R10, the seventh diode D7 and the ninth diode D9 clamp the input, the eighteenth capacitor C18 is used for power supply input filtering of the amplifier, and the left and right fuel quantity circuit outputs are push-pull signals, which are respectively input to the twelfth port and the twenty-sixth port of the single-chip computer through the operational amplifier.

[0047] Ignition switch circuit Figure 7 As shown, it includes: a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-third capacitor C23, a thirteenth diode D13, and a fourteenth diode D14, wherein the cathode of the thirteenth diode D13 is connected to the ignition switch OFF position signal input terminal, and the anode is connected to the twenty-third resistor R23 and the twenty-fourth resistor R24; the anode of the fourteenth diode D14 is grounded, and the cathode is connected to the ignition switch OFF position signal output terminal, the twenty-third resistor R23, and the twenty-third capacitor C23; one end of the twenty-third capacitor C23 is connected to the ignition switch OFF position signal output terminal, the twenty-third resistor R23, and the cathode of the fourteenth diode D14, and one end is grounded; one end of the twenty-fourth resistor R24 ​​is connected to the power supply and the other end is connected to the twenty-third resistor R23 and the anode of the thirteenth diode D13; one end of the twenty-third resistor R23 is connected to the twenty-fourth resistor R24 ​​and the anode of the thirteenth diode D13, and one end is connected to the ignition switch OFF position signal output terminal, the twenty-third capacitor C23, and the cathode of the fourteenth diode D14. The twenty-third capacitor C23 provides signal filtering, the thirteenth diode D13 provides reverse voltage protection to prevent external high voltage input, and the fourteenth diode D14 provides voltage stabilization protection for the microcontroller port.

[0048] Fuel flow signal circuit such as Figure 8 As shown, it includes: a twenty-fifth resistor R25, a fifteenth diode D15, and a sixteenth diode D16, wherein one end of the twenty-fifth resistor R25 is connected to the fuel flow signal input end, and the other end is connected to the fuel flow signal output end, the anode of the fifteenth diode D15, and the cathode of the sixteenth diode D16, the anode of the sixteenth diode D16 is grounded, the cathode of the sixteenth diode D16 is connected to the anode of the fifteenth diode D15, the fuel flow signal output end, and the twenty-fifth resistor R25, the cathode of the fifteenth diode D15 is connected to the power supply, the anode of the fifteenth diode D15 is connected to the fuel flow signal output end, the cathode of the sixteenth diode D16, and the twenty-fifth resistor R25, the fuel flow signal is input to the single-chip computer port through the current limiting of the twenty-fifth resistor R25, and the fifteenth diode D15 provides voltage limiting protection.

[0049] CAN bus circuit such as Fig. 9As shown, it includes: a sixth chip U6, a twenty-fourth capacitor C24, a twenty-sixth resistor R26, and a first bridge rectifier diode D17, wherein the first port and the fourth port of the sixth chip U6 are respectively connected to two input signals of the CAN bus, the third port is connected to the power supply and the twenty-fourth capacitor C24, the second port is grounded, the sixth port and the seventh port are respectively connected to the high and low signal output ends of the CAN bus, one end of the twenty-fourth capacitor C24 is connected to the power supply, and the other end is grounded, the first bridge rectifier diode D17 and the twenty-sixth resistor R26 are connected in parallel to the high and low signal output ends of the CAN bus, the sixth chip U6 in the circuit is a CAN transceiver, which is specially used for high-speed CAN FD transmission and reception, the twenty-fourth capacitor C24 is a decoupling capacitor, the eighth port on the sixth chip U6 is connected to GND to keep the high-speed part of the transceiver receiver and the transmitter in an activated state, and the first bridge rectifier diode D17 is used to provide transient protection.

[0050] The output unit includes: a fuel transfer pump control circuit, a standby fuel pump and channel B standby power supply control circuit, a fuel system fault circuit, and an indicator light control circuit.

[0051] Fuel transfer pump control circuit Figure 6As shown, it includes: a first protection device F1, a fifth chip U5, a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, an eleventh diode D11, a twelfth diode D12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, and a twenty-second capacitor C22, wherein one end of the first protection device F1 is connected to the 28VDC power input terminal, and one end is connected to the The first input terminal of the fifth chip U5, the second port of the fifth chip U5 is connected to the first protection device F1, the fourth port is connected to the source of the fourth field effect transistor Q4, the fifth port is grounded, the sixth port is connected to the twenty-first resistor R21 and the twenty-second resistor R22, the eighth output terminal is connected to the power supply, the twelfth diode D12 and the twentieth capacitor C20 are connected in parallel, one end is connected to the drain of the fourth field effect transistor Q4, and one end is grounded, the eleventh diode D11 and the nineteenth capacitor C19 are connected in parallel, the tenth diode anode is connected to the gate of the fourth field effect transistor Q4, one end of the cathode of the eleventh diode D11 is connected to the source of the fourth field effect transistor Q4, one end of the twenty-second capacitor C22 is grounded, and one end is connected to the aircraft ground wire, and one end of the twenty-first capacitor C21 is connected The gate of the first field effect transistor Q1 is connected to the sixteenth resistor R16 and the seventeenth resistor R17, the source is grounded, and the drain is connected to the gate of the second field effect transistor Q2. The gate of the second field effect transistor Q2 is connected to the drain of the first field effect transistor, the fourteenth resistor R14, and the fifteenth resistor R15, the source is grounded, and the drain is connected to the nineteenth resistor R19. The gate of the third field effect transistor Q3 is connected to the transfer pump start signal input terminal and the thirteenth resistor R13, the source is grounded, and the drain is connected to the eighteenth resistor R18. The gate of the fourth field effect transistor Q4 is connected to the anode of the eleventh diode D11, the nineteenth capacitor C19, the eighteenth resistor R18, and the twentieth resistor R20, and the source is connected The fourth port of the fifth chip U5, the cathode of the eleventh diode D11, the nineteenth capacitor C19, the drain is connected to the signal output terminal, the twentieth capacitor C20, the twenty-first capacitor C21, the twelfth diode D12, the thirteenth resistor R13 has one end connected to the ground, and one end connected to the gate of the third field effect transistor Q3, the fourteenth resistor R14 has one end connected to the ground, and one end connected to the gate of the second field effect transistor Q2, the fifteenth resistor R15 has one end connected to the transfer pump on / off control signal input terminal, and one end connected to the gate of the second field effect transistor Q2, the sixteenth resistor R16 has one end connected to the transfer pump off signal input terminal, and one end connected to the gate of the first field effect transistor Q1, the seventeenth resistor R17 has one end connected to the ground, and one end connected to the gate of the first field effect transistor Q1,One end of the 20th resistor R20 is connected to the 28VDC power input terminal, and the other end is connected to the gate of the fourth field effect transistor Q4. One end of the 18th resistor R18 is connected to the source of the fourth field effect transistor Q4, and the other end is connected to the drain of the third field effect transistor Q3. One end of the 19th resistor R19 is connected to the drain of the second field effect transistor Q2, and the other end is connected to the source of the fourth field effect transistor Q4. One end of the 21st resistor R21 is connected to the sixth output terminal of the fifth chip U5, and the other end is connected to the power supply. One end of the 22nd resistor R22 is connected to the sixth output terminal of the fifth chip U5, and the other end is grounded. The 20th capacitor C20, the 21st capacitor C21, and the 22nd capacitor C22 are used for filtering the power supply line. The 12th diode D12 is a transient voltage suppressor, which is used for overvoltage protection of the power supply line.

[0052] The backup fuel pump and channel B backup power control circuit are as follows Fig.11 As shown, it includes: a first photocoupler K1A, a second photocoupler K1B, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a seventeenth diode D17, and an eighteenth diode D18, wherein the first input end of the first photocoupler K1A is connected to a power supply, the second input end is connected to the twenty-ninth resistor R29, the seventh output end is grounded and the anode of the seventeenth diode D17, the eighth output end is connected to the thirty-first resistor R31 and the cathode of the seventeenth diode D17, one end of the twenty-ninth resistor R29 is connected to the engine standby fuel pump on / off control signal input end output by the single chip, one end of the twenty-ninth resistor R29 is connected to the second input end of the first photocoupler K1A, and one end of the thirtieth resistor R30 is connected to the engine channel B standby output by the single chip. The power on / off control signal input terminal is used, one end of the 30th resistor R30 is connected to the fourth input terminal of the second photocoupler K1B, one end of the 31st resistor R31 is connected to the eighth output terminal of the first photocoupler K1A, one end of the 31st resistor R31 is connected to the engine standby fuel pump on / off control signal output terminal, one end of the 32nd resistor R32 is connected to the sixth output terminal of the second photocoupler K1B, one end of the 32nd resistor R32 is connected to the engine channel B standby power on / off control signal output terminal, the seventeenth diode D17 is connected to the seventh output terminal of the first photocoupler K1A, and the cathode is connected to the eighth output terminal of the first photocoupler K1A, the eighteenth diode D18 is connected to the fifth output terminal of the second photocoupler K1B, and the cathode is connected to the sixth output terminal of the second photocoupler K1B. The twenty-ninth resistor R29 and the thirtieth resistor R30 are used for current limiting of the microcontroller output port. The thirty-first resistor R31, the eighteenth diode D18 and the thirty-second resistor R32, the nineteenth diode D19 are all used to protect the relay coil of the external circuit to prevent the reverse electromotive force from damaging the coil. At the same time, the selection of the thirty-first resistor R31 will meet the minimum current requirement when the relay coil is working to ensure that the relay can work normally.

[0053] Fuel system fault circuit such as Fig.12 As shown, it includes: a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a fifth field effect transistor Q5, a twentieth diode C20, and a twenty-first diode C21, wherein one end of the thirty-fourth resistor R34 is connected to the 28VDC power input end, and one end is connected to the anode of the twentieth diode C20, one end of the thirty-third resistor R33 is connected to the fault signal input end, and one end is connected to the gate of the fifth field effect transistor Q5, one end of the thirty-fifth resistor R35 is connected to the cathode of the twenty-first diode C21, and one end is connected to the fault signal output end, the gate of the fifth field effect transistor Q5 is connected to the thirty-third resistor R33, the source is grounded, the drain is connected to the cathode of the twenty-first diode C21, the cathode of the twenty-first diode C21 is connected to the thirty-fifth resistor R35 and the drain of the fifth field effect transistor Q5, the anode of the twentieth diode C20 is connected to the thirty-fourth resistor R34, the cathode of the twentieth diode C20 is connected to the drain of the fifth field effect transistor Q5 and the thirty-fifth resistor R35, and the anode is grounded. The fault signal output by the single chip microcomputer is a frequency signal, which drives the base of the fifth field effect transistor Q5 and switches Q4 at the same frequency, thereby generating a signal of the same frequency at the output end. The twenty-first diode C21 provides overvoltage protection.

[0054] Indicator light driving circuit Fig.13As shown, it includes: a second chip IC2, a third chip IC3, a fourth chip IC4, a fifth chip IC5, a sixth chip IC6, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, a first logic circuit AND1, and a twenty-eighth capacitor C28, wherein the third input end of the second chip IC2 is connected to the first logic circuit AND1, the first input end and the second input end are connected to the fuel transfer pump working indicator light indication signal input end, the first input end and the second input end of the first logic circuit AND1 are respectively connected to the fuel transfer pump dimming control signal input end and the fuel transfer pump LED control signal input end, and the first input end of the second chip IC2 to the fifth chip IC5 are connected to the first input end of the first logic circuit AND1. The output end and the second output end are connected to the LED light indication signal input end of the light guide plate, the third input ends of the second chip IC2 to the fifth chip IC5 are respectively connected to the LED light control signal input ends of the first to fourth light guide plates output by the single-chip microcomputer, the fourth input ends of the first chip to the fifth chip IC5 are respectively connected to the thirty-sixth resistor R36, the thirty-seventh resistor R37, the thirty-eighth resistor R38, the thirty-ninth resistor R39, and the fortieth resistor R40, the 5th to 8th output ends of the second chip IC2 to the sixth chip IC6 are grounded, one end of the thirty-sixth resistor R36, the thirty-seventh resistor R37, the thirty-eighth resistor R38, the thirty-ninth resistor R39, and the fortieth resistor R40 are connected to the fourth input end of the second chip IC2 to the sixth chip IC6, and one end is grounded. The second chip IC2 is used to drive the indicator light of the fuel transfer pump. The third chip IC3, the fourth chip IC4, the fifth chip IC5 and the sixth chip IC6 are used to drive the LED lights of other light guide plates. The thirty-sixth resistor R36, the thirty-seventh resistor R37, the thirty-eighth resistor R38, the thirty-ninth resistor R39 and the fortieth resistor R40 are used to set the driving current. The first logic circuit AND1 is an AND gate logic circuit, which receives the dimming control signal and the fuel transfer pump LED light control signal output by the single-chip microcomputer, thereby driving IC2 to work. C28 is the decoupling capacitor of U7.

[0055] Dimming control signal circuit such as Fig.14 As shown, it includes: a forty-first resistor R41 and a twenty-first diode D21, wherein one end of the forty-first resistor R41 is connected to the dimming control signal input end, and the other end is connected to the cathode of the twenty-first diode D21 and the dimming control signal output end, the anode of the twenty-first diode D21 is grounded, and the cathode of the twenty-first diode D21 is connected to the forty-first resistor and the dimming control signal output end. The dimming control signal comes from other devices on the aircraft and is a PWM signal. It is directly input to the microcontroller port through R41, and the twenty-first diode D21 provides transient voltage protection.

[0056] The single chip control circuit is as follows Fig.10As shown, it includes: a single-chip microcomputer IC1, a PCB board P1, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a first quartz oscillator Y1, and a twenty-seventh capacitor C27, wherein the first port of the single-chip microcomputer IC1 is connected to the fortieth resistor R40 and the first input end of the PCB board P1, the second input end of the single-chip microcomputer IC1 is connected to the fuel flow input signal input end, the fifth input end is connected to the fuel transfer pump off signal input end, the sixth input end is connected to the fuel transfer pump automatic signal input end, the seventh input end is connected to the on signal input end, the eighth input end is grounded, and the ninth input end is connected to the clock The signal input terminal, the twelfth port is connected to the left fuel oil input signal terminal, the thirteenth port is connected to the dimming control signal input terminal, the fourteenth port is connected to the ignition switch is in the OFF position input signal terminal, the twenty-second output terminal and the twenty-first output terminal of the single-chip microcomputer IC1 are respectively connected to the fourth input terminal and the fifth input terminal of the PCB board P1, the twenty-second output terminal of the single-chip microcomputer IC1 is connected to the transfer pump control signal output terminal, the twenty-fourth output terminal and the twenty-fifth output terminal are connected to the CAN bus data output terminal, the twenty-third output terminal is connected to the standby fuel pump control signal output terminal, the twenty-first output terminal is connected to the fault signal output terminal, and the twentieth output terminal is connected to The power supply and the twenty-sixth capacitor C26, the nineteenth output terminal is connected to the ground and the twenty-sixth capacitor C26, the seventeenth output terminal is connected to the engine channel B backup power supply on / off control signal input terminal, the sixteenth output terminal is connected to the engine backup fuel pump on / off control signal input terminal, one end of the thirty-ninth resistor R39 is connected to the power supply, one end is connected to the fortieth resistor R40 and the twenty-fifth capacitor C25, one end of the fortieth resistor R40 is connected to the first input terminal of the single-chip computer IC1 and the first input terminal of the PCB board P1, one end is connected to the thirty-ninth resistor R39 and the twenty-fifth capacitor C25, and one end of the twenty-fifth capacitor C25 is connected to the thirty-ninth resistor R39 and the 40th resistor R40, one end is grounded, the first input end of the PCB board P1 is connected to the 40th resistor R40 and the first input end of the single-chip computer IC1, the second input end of the PCB board P1 is connected to the power supply, the third input end of the PCB board P1 is grounded, the fourth input end and the fifth input end of the PCB board P1 are respectively connected to the 22nd output end and the 21st output end of the single-chip computer IC1, the 26th capacitor C26 is connected to the power supply at one end and grounded at the other end, the second output end of the first quartz oscillator Y1 is grounded, the third output end is connected to the clock signal end, the fourth input end is connected to the power supply and the 27th capacitor C27, P1 is used for writing the internal program of the single-chip computer. The 27th resistor R27, the 28th resistor R28, and the 25th capacitor C25 form an RC network, the single-chip computer IC1 and the PCB board P1 are connected to this RC network to realize the normal operation of the single-chip computer, and the 26th capacitor C26 is a decoupling capacitor for the single-chip computer IC1. In order to meet the tolerance requirements of the normal operation of the CAN external device, a quartz oscillator Y1 is designed and used, and C27 is a decoupling capacitor.

[0057] Combination Figure 6 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 The utility model uses a combination of software and hardware to achieve automatic control.

[0058] Software architecture such as Fig.15 As shown, after the software is powered on, it executes the initialization of hardware, memory, and SBIT. After the initialization is completed, four functions are executed in the main loop: fuel quantity acquisition function, fuel transfer pump function, backup fuel pump function, and channel B backup power function. During the operation, the interrupt program is used to respond to inputs and timers, and the program is written through the PCB board in the microcontroller master control circuit.

[0059] The specific implementation can be divided into the following six situations:

[0060] 1. Manually force the fuel transfer pump to be closed or opened

[0061] When the manual control fuel transfer pump switch is in the OFF position, the fuel transfer pump is turned off; when the manual control fuel transfer pump switch is in the ON position, the fuel transfer pump is turned on. Figure 7 As shown, its output signals XLLR_PUMP_SW_OFF_IN and XLLR_PUMP_SW_ON_IN are connected to the single-chip microcomputer through the fifth port and the seventh port respectively, and the single-chip microcomputer uses XLLR_PUMP_SW_OFF_IN and XLLR_PUMP_SW_ON_IN as Figure 6 The input signal of the fuel transfer pump control circuit shown controls the power supply of the fuel transfer pump through the fourth field effect transistor Q4 in the control circuit. When the gate voltage of the fourth field effect transistor Q4 is at a low level, the fourth field effect transistor Q4 will be turned on to supply power to the fuel transfer pump. When the gate voltage of the fourth field effect transistor Q4 is at a high level, the fourth field effect transistor Q4 will be turned off to cut off the power supply to the fuel transfer pump.

[0062] When the fuel transfer pump switch is in the OFF position, the fuel transfer pump switch transmits the XFER_PUMP_SW_OFF_IN signal as an input signal to the Figure 6 In the control circuit shown, the first field effect transistor Q1 is turned on, pulling down the gate voltage of the second field effect transistor Q2, the gate voltage of the fourth field effect transistor Q4 is kept at a high level, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, and the fuel transfer pump is turned off;

[0063] When the fuel transfer pump switch is in the ON position, the fuel transfer pump switch transmits the XFER_PUMP_SW_ON_IN signal as an input signal to the Figure 6 In the control circuit shown, the third field effect transistor Q3 is turned on, the gate voltage of the fourth field effect transistor Q4 is pulled low, and the fourth field effect transistor Q4 is turned on, thereby supplying power to the fuel transfer pump, and the fuel transfer pump is turned on.

[0064] 2. Automatic control of fuel transfer pump

[0065] The automatic control of the fuel transfer pump is achieved through a combination of software and hardware. Specifically,

[0066] The fuel quantity function captures the frequency signal input by the fuel quantity sensor and converts it into a frequency value, and then converts it into volume according to the formula. In order to suppress the impact of fuel fluctuations, a moving average filter is used in the function to process the fuel quantity value. One data is collected every 2 seconds, and the fuel quantity value is obtained by averaging 60 data. The left and right tank fuel quantity signals are recorded as: LFT_FUEL_LEV_IN, RT_FUEL_LEV_IN, respectively. This signal is a push-pull signal and is used as Figure 5 The left and right fuel level circuit input signals are shown in the figure. After passing through the operational amplifier, the signals are output as LFT_FUEL_LEVEL_IN_PORT and RT_FUEL_LEVEL_IN_PORT, which are input to the 12th and 26th ports of the single-chip microcomputer respectively. The fuel transfer pump switch circuit is shown in the figure. Figure 7 As shown, its output signal XFER_PUMP_SW_AUTO_IN is connected to the single-chip microcomputer through the sixth port, and the single-chip microcomputer uses XFER_PUMP_SW_AUTO_IN as Figure 6 The input signal of the fuel transfer pump control circuit shown controls the power supply of the fuel transfer pump through the fourth field effect transistor Q4 in the control circuit. When the gate voltage of the fourth field effect transistor Q4 is at a low level, the fourth field effect transistor Q4 will be turned on to supply power to the fuel transfer pump. When the gate voltage of the fourth field effect transistor Q4 is at a high level, the fourth field effect transistor Q4 will be turned off to cut off the power supply to the fuel transfer pump.

[0067] When the fuel transfer pump switch is in the AUTO position and the aircraft ignition switch is not in the OFF position, the fuel transfer pump function input by the microcontroller performs logical operations based on the oil levels in the left and right tanks LFT_FUEL_LEVEL_IN_PORT and RT_FUEL_LEVEL_IN_PORT, and outputs the transfer pump on / off control signal XFER_PUMP_EN_OUT, which corresponds to the output of a high / low level signal in the circuit, thereby driving Q2 on / off and controlling the gate voltage of Q4 to a high / low level, so that the transfer pump does not work / works.

[0068] Specifically,

[0069] The initial state of the fuel transfer pump function is XFR_PUMP_INIT. When LFT_FUEL_LEVEL_IN_PORT is greater than 14 gallons, XFER_PUMP_EN_OUT is low, driving the second field effect transistor Q2 to turn off, controlling the gate voltage of the fourth field effect transistor Q4 to be high, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, the fuel transfer pump is turned off, and the fuel transfer pump function state changes to XFR_PUMP_OFF;

[0070] When LFT_FUEL_LEVEL_IN_PORT is less than 14 gallons, and LEFT_FUEL_LEVEL_IN_PORT is less than RT_FUEL_LEVEL_IN_PORT by more than 4 gallons, XFER_PUMP_EN_OUT is high, thereby driving Q2 to turn on, controlling the gate voltage of Q4 to be low, and turning on the fourth field effect transistor Q4, thereby supplying power to the fuel transfer pump, the fuel transfer pump is turned on, and the fuel transfer pump function state changes to XFR_PUMP_ON;

[0071] When LFT_FUEL_LEVEL_IN_PORT is less than 14 gallons and LFT_FUEL_LEVEL_IN_PORT is greater than RT_FUEL_LEVEL_IN_PORT by more than 4 gallons, XFER_PUMP_EN_OUT is low, thereby driving Q2 to turn off, controlling the gate voltage of Q4 to be high, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, the fuel transfer pump is turned off, and the fuel transfer pump function state changes to XFR_PUMP_OFF;

[0072] When the fuel transfer pump function state changes to XFR_PUMP_OFF, if LFT_FUEL_LEVEL_IN_PORT is greater than 14 gallons, then XFER_PUMP_EN_OUT is at a low level, driving the second field effect transistor Q2 to turn off, controlling the gate voltage of the fourth field effect transistor Q4 to be at a high level, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, and the fuel transfer pump function state changes to XFR_PUMP_INIT;

[0073] When the fuel transfer pump function state changes to XFR_PUMP_ON, if LFT_FUEL_LEVEL_IN_PORT is greater than 14 gallons, then XFER_PUMP_EN_OUT is at a low level, driving the second field effect transistor Q2 to turn off, controlling the gate voltage of the fourth field effect transistor Q4 to be at a high level, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, and the fuel transfer pump function state changes to XFR_PUMP_INIT;

[0074] When RT_FUEL_LEVEL_IN_PORT is less than 1 gallon, XFER_PUMP_EN_OUT is high, thereby driving Q2 to turn on, controlling the gate voltage of Q4 to be low, and turning on the fourth field effect transistor Q4, thereby supplying power to the fuel transfer pump, the fuel transfer pump is turned on, and the fuel transfer pump function state changes to XFR_PUMP_ON, and the transfer pump timer is started at the same time. After running for 9 minutes, XFER_PUMP_EN_OUT is low, thereby driving Q2 to turn off, controlling the gate voltage of Q4 to be high, and turning off the fourth field effect transistor Q4, thereby disconnecting the power supply to the fuel transfer pump, the fuel transfer pump is turned off, and the fuel transfer pump function state is set to XFR_PUMP_FINISH;

[0075] If LFT_FUEL_LEVEL_IN_PORT is less than 4 gallons, XFER_PUMP_EN_OUT is high, thereby driving Q2 to turn on, controlling the gate voltage of the fourth field effect transistor Q4 to be low, and the fourth field effect transistor Q4 is turned on, thereby supplying power to the fuel transfer pump, the fuel transfer pump is turned on, and the fuel transfer pump function state becomes XFR_PUMP_ON, and the transfer pump timer is started at the same time. After running for 9 minutes, XFER_PUMP_EN_OUT is low, thereby driving Q2 to turn off, controlling the gate voltage of Q4 to be high, and the fourth field effect transistor Q4 is turned off, thereby disconnecting the power supply to the fuel transfer pump, the fuel transfer pump is turned off, and the fuel transfer pump function state is set to XFR_PUMP_INIT.

[0076] 3.Automatic control of standby fuel pump

[0077] The automatic control of the standby fuel pump is achieved through a combination of software and hardware. Specifically,

[0078] like Figure 7 The ignition switch circuit shown in FIG. 1 outputs an ignition switch signal IGN_SW_OFF_POS_IN_PORT, which is connected to the microcontroller through the fourteenth interface of the microcontroller, such as Figure 8The fuel flow signal circuit shown in the figure outputs the fuel flow signal FULL_FLOW_IN_PORT, which is connected to the twenty-third interface of the single-chip microcomputer. The single-chip microcomputer outputs the signal RLAY_CTRL_AUXPUMP_OUT as shown in the figure. Fig.11 The input signals of the standby fuel pump and channel B standby power control circuit are shown. When the aircraft ignition switch is not in the OFF position, the standby fuel pump function input by the microcontroller controls the power supply of the standby fuel pump through the output signal AUX_PUMP_PWR_RLY_CTRL according to the engine speed and fuel flow signal, thereby automatically turning on / off the standby fuel pump.

[0079] Specifically,

[0080] When the ignition switch is always in the OFF position, the current state is maintained;

[0081] When the aircraft ignition switch is not in the OFF position, the engine speed RPM is detected. When the engine speed RPM is lower than 2500, the engine speed RPM is continuously detected.

[0082] When the aircraft ignition switch is not in the OFF position, the engine speed RPM is greater than or equal to 2500, and FULL_FLOW_IN_PORT is less than or equal to 14.8 gallons / hour, the output signal AUX_PUMP_PWR_RLY_CTRL controls the standby fuel pump power supply, and the engine standby fuel pump is turned on;

[0083] When the aircraft ignition switch is not in the OFF position, after the engine speed RPM is greater than or equal to 2500, FULL_FLOW_IN_PORT is greater than 14.8 gallons / hour and less than or equal to 16.5 gallons / hour, and the duration is greater than 30 seconds, the output signal AUX_PUMP_PWR_RLY_CTRL controls the power supply of the standby fuel pump, and the engine standby fuel pump is turned on;

[0084] When the aircraft ignition switch is not in the OFF position, once the standby fuel pump is automatically turned on, the standby fuel pump will not stop working even if FULL_FLOW_IN_PORT is greater than 16.5 gph;

[0085] When the ignition switch is OFF in any state, it returns to the initial state.

[0086] 4. Automatic control of channel B backup power supply

[0087] The automatic control of the backup power supply of channel B is realized by combining software and hardware.

[0088] Specifically,

[0089] The single-chip microcomputer outputs CANTX signal and CANRX signal from the 25th port and the 24th port respectively to the Fig. 9 The CAN bus circuit shown in the figure outputs CAN_HI_IN and CAN_LO_IN signals, and the MCU's 17th port outputs the signal RLAY_CTRL_LANEB_OUT to the Fig.11 The backup fuel pump and channel B backup power control circuit shown in the figure, the circuit controls the channel B backup power on / off through the output signal LANEB_PWR_RLY_CTRL. After the channel B backup power function input by the single chip microcomputer is initialized, it first detects whether there is a channel B power supply fault and whether the channel B power supply is turned off.

[0090] When the ignition switch is always in the OFF position, the current state is maintained;

[0091] When the ignition switch is not in the OFF position, the engine speed RPM is detected. When the speed is lower than 2500 rpm, the RPM is continuously detected.

[0092] When the ignition switch is not in the OFF position, the engine speed is greater than or equal to 2500 rpm, and the CAN bus data stops transmitting for more than 2 seconds, the channel B backup power supply is immediately powered through the LANEB_PWR_RLY_CTRL signal, and the channel B backup power supply is turned on;

[0093] When the ignition switch is not in the OFF position, once the channel B backup power supply is automatically turned on, the channel B backup power supply will not be turned off even if the engine speed is greater than or equal to the preset value 3 and the CAN bus data returns to normal;

[0094] When the ignition switch is OFF in any state, it returns to the initial state.

[0095] 5. Fuel system alarm design

[0096] According to the operating status of the device itself, the fuel transfer pump, the left and right fuel level sensors, the ignition switch, the engine, etc., the single-chip microcomputer control circuit receives the fault signal and uses the 21st interface data FAULT_OUT signal as Fig.12 The input signal of the fuel system fault circuit shown in the figure, the circuit output status indication signal FCM_FAULT_OUT, corresponds to different system fault modes. The signal uses a frequency signal, and different frequency intervals correspond to different system states. Specifically,

[0097] When the system has no abnormal faults, it outputs a normal operating signal;

[0098] When the engine standby fuel pump fails to start, a standby fuel pump start failure signal is output;

[0099] When the engine channel B backup power supply fails to supply power, the output channel B power supply start-up fault signal;

[0100] When the ignition switch is not in the OFF position, and the left fuel level remains unchanged for more than 120 seconds, and the engine speed is greater than 5000 rpm, and the left fuel level is less than 14 gallons, the left tank fuel level sensor is stuck fault signal is output;

[0101] When the ignition switch is not in the OFF position, and the fuel transfer pump is turned on, and the right fuel level has not changed for more than 120 seconds, and the engine speed is greater than 5000 rpm, and the right fuel level is less than 14 gallons, the right tank fuel level sensor is stuck fault signal is output;

[0102] When the ignition switch is not in the OFF position, and the fuel transfer pump is controlled to start, and the actual fuel transfer pump is turned off, the fuel transfer pump inoperative fault signal is output;

[0103] When the fuel transfer pump is controlled to be closed and the actual fuel transfer pump is started, a fuel transfer pump stuck fault signal is output;

[0104] When the difference between the left and right fuel levels is greater than 7 gallons, a fuel imbalance fault signal is output;

[0105] When the left and right oil levels exceed the specified range, the output device will generate a fault signal.

[0106] When there are multiple faults at the same time, the device must be able to output each fault signal and cycle through all faults at intervals of 2 seconds.

[0107] 6. Automatic control of the transfer pump indicator light

[0108] The automatic control of the transfer pump indicator light is controlled by the indicator light control circuit (such as Fig.13 As shown) and dimming control signal circuit implementation (as shown Fig.14 As shown), the dimming signal output by the dimming control signal circuit controls the brightness of the indicator light, and the indicator light is turned on / off by the LED driver in the indicator light control circuit; the single-chip microcomputer outputs the signal XFER_PUMP_LED_EN_OUT through the thirteenth port as the input signal of the indicator light control circuit to control the on / off of the indicator light. Specifically,

[0109] When the fuel transfer pump is started, the signal XFER_PUMP_LED_EN_OUT controls the LED driver to start, the fuel transfer pump indicator light turns on, and the brightness of the fuel transfer pump indicator light is controlled by the dimming signal DIMMING_SIG_IN_PORT output by the dimming control signal circuit;

[0110] When the fuel transfer pump is turned off, the signal XFER_PUMP_LED_EN_OUT controls the LED driver to turn off, the fuel transfer pump indicator light goes out, and the brightness of the fuel transfer pump indicator light is controlled by the dimming signal DIMMING_SIG_IN_PORT output by the dimming control signal circuit;

[0111] In summary, the power fuel control device of the utility model collects fuel quantity data, fuel flow data, engine CAN data, and control device status parameters, and uses specific algorithm formulas and logical judgments to complete manual and automatic control of the fuel transfer pump, automatic control of the standby fuel pump, and output corresponding alarm signals. On the premise of meeting system requirements, it greatly reduces the workload of pilots, increases the safety of the system, and improves the intelligence level of the aircraft.

[0112] Finally, it is to be noted that any modification or equivalent replacement of part or all of the technical features based on the device structure of the utility model and the technical solution of the described embodiment, which does not deviate from the essence of the corresponding technical solution of the utility model, belongs to the scope of the utility model of the device structure of the utility model and the described implementation scheme.

Claims

1. A power fuel control device, characterized in that: include: Input unit: power supply circuit, fuel transfer pump switch circuit, left and right fuel quantity circuits, ignition switch circuit, fuel flow signal circuit, CAN bus circuit, Output unit: fuel transfer pump control circuit, standby fuel pump and channel B standby power control circuit, fuel system fault circuit, indicator light control circuit, dimming control signal circuit, Single chip microcomputer master control circuit; Among them, the output end of the power supply circuit is connected to the first port of the single-chip computer, the output end of the fuel transfer pump switch circuit is respectively connected to the fifth port, the sixth port, and the seventh port of the single-chip computer, the output ends of the left and right fuel quantity circuits are connected to the twelfth port and the twenty-sixth port of the single-chip computer, the output end of the ignition switch circuit is connected to the fourteenth port of the single-chip computer, the fuel flow signal circuit is connected to the twenty-third port, and the input end of the CAN bus circuit is connected to the twenty-fourth port and the twenty-fifth port of the single-chip computer; The input ends of the fuel transfer pump control circuit are respectively connected to the fifth port, the third port, and the seventh port of the single-chip computer; the input ends of the engine standby fuel pump on / off and the engine channel B standby power on / off control circuits are connected to the sixteenth port and the seventeenth port of the single-chip computer; the input end of the fuel system fault circuit is connected to the twenty-first port of the single-chip computer; and the input end of the fuel transfer pump indicator light control circuit is connected to the thirteenth port of the single-chip computer.

2. The power fuel control device according to claim 1, characterized in that: The fuel transfer pump switch circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifteenth capacitor, a sixteenth capacitor, and a seventeenth capacitor, wherein the fifth resistor, the sixth resistor, and the seventh resistor are respectively connected to the OFF gear, the AUTO gear, and the ON gear of the switch S1 gear, the eighth resistor is connected in parallel between the AUTO gear of the switch S1 gear and the ground wire, and the fifteenth capacitor, the sixteenth capacitor, and the seventeenth capacitor are respectively connected in parallel between the OFF gear, the AUTO gear, the ON gear of the switch S1 gear and the ground wire.

3. The power fuel control device according to claim 1, characterized in that: The left and right fuel quantity circuits include a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighteenth capacitor, a seventh diode, an eighth diode, a ninth diode, a tenth diode, a first amplifier, and a second amplifier, wherein one end of the ninth resistor and the tenth resistor are connected to the left and right fuel quantity input ends of the sensor, and one end is respectively connected to the positive input ends of the first amplifier and the second amplifier, the eleventh resistor and the twelfth resistor are respectively connected to the negative input ends of the first amplifier and the second amplifier, and one end is respectively connected to the output ends of the first amplifier and the second amplifier, the seventh diode and the eighth diode are connected in series with the anode grounded and the cathode connected to the power supply, the ninth diode and the tenth diode are connected in series with the anode grounded and the cathode connected to the power supply, the positive input end of the first amplifier is connected to the ninth resistor, the cathode of the eighth diode, and the anode of the seventh diode, the positive input end of the second amplifier is connected to the tenth resistor, the cathode of the eleventh diode, and the anode of the ninth diode, the negative input ends of the first amplifier and the second amplifier are respectively connected to the eleventh resistor and the twelfth resistor, and the output ends are respectively connected to the left and right fuel quantity output signal ends.

4. The power fuel control device according to claim 1, characterized in that: The ignition switch circuit includes a twenty-third resistor, a twenty-fourth resistor, a twenty-third capacitor, a thirteenth diode, and a fourteenth diode, wherein the cathode of the thirteenth diode is connected to the ignition switch OFF position signal input terminal, and the anode is connected to the twenty-third resistor and the twenty-fourth resistor; the anode of the fourteenth diode is grounded, and the cathode is connected to the ignition switch OFF position signal output terminal, the twenty-third resistor, and the twenty-third capacitor; one end of the twenty-third capacitor is connected to the ignition switch OFF position signal output terminal, the twenty-third resistor, and the cathode of the fourteenth diode, and one end is grounded; one end of the twenty-fourth resistor is connected to the power supply and one end is connected to the twenty-third resistor and the anode of the thirteenth diode; one end of the twenty-third resistor is connected to the twenty-fourth resistor and the anode of the thirteenth diode, and one end is connected to the ignition switch OFF position signal output terminal, the twenty-third capacitor, and the cathode of the fourteenth diode.

5. The power fuel control device according to claim 1, characterized in that: The fuel flow signal circuit includes: a twenty-fifth resistor, a fifteenth diode, and a sixteenth diode, wherein one end of the twenty-fifth resistor is connected to the fuel flow signal input end, and the other end is connected to the fuel flow signal output end, the anode of the fifteenth diode, and the cathode of the sixteenth diode, the anode of the sixteenth diode is grounded, the cathode of the sixteenth diode is connected to the anode of the fifteenth diode, the fuel flow signal output end, and the twenty-fifth resistor, the cathode of the fifteenth diode is connected to the power supply, and the anode of the fifteenth diode is connected to the fuel flow signal output end, the cathode of the sixteenth diode, and the twenty-fifth resistor.

6. The power fuel control device according to claim 1, characterized in that: The CAN bus circuit includes a sixth chip, a twenty-fourth capacitor, a twenty-sixth resistor, and a first bridge rectifier diode, wherein the first port and the fourth port of the sixth chip are respectively connected to two input signals of the CAN bus, the third port is connected to the power supply and the twenty-fourth capacitor, the second port is grounded, the sixth port and the seventh port are respectively connected to the high and low signal output ends of the CAN bus, one end of the twenty-fourth capacitor is connected to the power supply and the other end is grounded, and the first bridge rectifier diode and the twenty-sixth resistor are connected in parallel to the high and low signal output ends of the CAN bus.

7. The power fuel control device according to claim 1, characterized in that: The fuel transfer pump control circuit includes a first protection device, a fifth chip, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, an eleventh diode, a twelfth diode, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, and a twenty-second capacitor, wherein one end of the first protection device is connected to the 28VDC power input end, and one end is connected to the first input end of the fifth chip, the second port of the fifth chip is connected to the first protection device, the fourth port is connected to the source of the fourth field effect transistor, and the fifth port is connected to the source of the fourth field effect transistor. The sixth port is connected to the twenty-first resistor and the twenty-second resistor. The eighth output terminal is connected to the power supply. After the twelfth diode and the twentieth capacitor are connected in parallel, one end is connected to the drain of the fourth field effect transistor and the other end is grounded. The eleventh diode and the nineteenth capacitor are connected in parallel. The anode of the tenth diode is connected to the gate of the fourth field effect transistor. One end of the cathode of the eleventh diode is connected to the source of the fourth field effect transistor. One end of the twenty-second capacitor is grounded and the other end is connected to the aircraft ground wire. One end of the twenty-first capacitor is connected to the drain of the fourth field effect transistor and the other end is connected to the aircraft ground wire. The gate of the first field effect transistor is connected to the sixteenth resistor and the seventeenth resistor, the source is grounded, and the drain is connected to the gate of the second field effect transistor. The gate of the second field effect transistor is connected to the first field effect transistor. The drain of the tube, the fourteenth resistor, the fifteenth resistor, the source is grounded, the drain is connected to the nineteenth resistor, the gate of the third field effect transistor is connected to the transfer pump open signal input terminal and the thirteenth resistor, the source is grounded, the drain is connected to the eighteenth resistor, the gate of the fourth field effect transistor is connected to the anode of the eleventh diode, the nineteenth capacitor, the eighteenth resistor and the twentieth resistor, the source is connected to the fourth port of the fifth chip, the cathode of the eleventh diode, the nineteenth capacitor, the drain is connected to the signal output terminal, the twentieth capacitor, the twenty-first capacitor, the twelfth diode, one end of the thirteenth resistor is grounded, and one end is connected to the gate of the third field effect transistor, one end of the fourteenth resistor is grounded, and one end is connected to the gate of the second field effect transistor, and one end of the fifteenth resistor is connected to the transfer pump open / close A control signal input terminal, one end of which is connected to the gate of the second field effect transistor, a sixteenth resistor, one end of which is connected to the transfer pump off signal input terminal, and one end of which is connected to the gate of the first field effect transistor, a seventeenth resistor, one end of which is grounded, and one end of which is connected to the gate of the first field effect transistor, a twentieth resistor, one end of which is connected to the 28VDC power supply input terminal, and one end of which is connected to the gate of the fourth field effect transistor, an eighteenth resistor, one end of which is connected to the source of the fourth field effect transistor, and one end of which is connected to the drain of the third field effect transistor, a nineteenth resistor, one end of which is connected to the drain of the second field effect transistor, and one end of which is connected to the source of the fourth field effect transistor, a twenty-first resistor, one end of which is connected to the sixth output terminal of the fifth chip, and one end of which is connected to the power supply, a twenty-second resistor, one end of which is connected to the sixth output terminal of the fifth chip, and one end of which is grounded.

8. The power fuel control device according to claim 1, characterized in that: The backup fuel pump and channel B backup power supply control circuit comprises a first photoelectric coupler, a second photoelectric coupler, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a seventeenth diode, and an eighteenth diode, wherein the first input end of the first photoelectric coupler is connected to the power supply, the second input end is connected to the twenty-ninth resistor, the seventh output end is grounded and the anode of the seventeenth diode, the eighth output end is connected to the thirty-first resistor and the cathode of the seventeenth diode, one end of the twenty-ninth resistor is connected to the engine backup fuel pump on / off control signal input end output by the single-chip microcomputer, one end of the twenty-ninth resistor is connected to the second input end of the first photoelectric coupler, and one end of the thirtieth resistor is connected to the engine pass signal output by the single-chip microcomputer. One end of the 30th resistor is connected to the fourth input terminal of the second photocoupler, one end of the 31st resistor is connected to the eighth output terminal of the first photocoupler, one end of the 31st resistor is connected to the engine channel B backup power on / off control signal output terminal, one end of the 32nd resistor is connected to the sixth output terminal of the second photocoupler, one end of the 32nd resistor is connected to the engine channel B backup power on / off control signal output terminal, the anode of the 17th diode is connected to the seventh output terminal of the first photocoupler, and the cathode is connected to the eighth output terminal of the first photocoupler, the anode of the 18th diode is connected to the fifth output terminal of the second photocoupler, and the cathode is connected to the sixth output terminal of the second photocoupler.

9. The power fuel control device according to claim 1, characterized in that: The fuel system fault circuit includes a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a fifth field effect transistor, a nineteenth diode, and a twentieth diode, wherein one end of the thirty-fourth resistor is connected to the 28VDC power input end and one end is connected to the anode of the nineteenth diode, one end of the thirty-third resistor is connected to the fault signal input end and one end is connected to the gate of the fifth field effect transistor, one end of the thirty-fifth resistor is connected to the cathode of the twentieth diode and one end is connected to the fault signal output end, the gate of the fifth field effect transistor is connected to the thirty-third resistor, the source is grounded, the drain is connected to the cathode of the nineteenth diode, the cathode of the nineteenth diode is connected to the thirty-fifth resistor and the drain of the fifth field effect transistor, the anode of the nineteenth diode is connected to the thirty-fourth resistor, the cathode of the twentieth diode is connected to the drain of the fifth field effect transistor and the thirty-fifth resistor, and the anode is grounded.

Images