Load disturbance suppression device of electric fuel pump

Abstract

The embodiment of the invention discloses a load disturbance suppression device of an electric fuel pump. The load disturbance suppression device is characterized in that phase current in operation of a permanent magnet synchronous motor is acquired through a motor phase current measurement module and is converted into a phase current digital signal; measuring the position of a motor rotor in real time through a motor rotor position and rotating speed measurement module, and calculating the rotating speed of the motor rotor; the phase current alternating current-direct current conversion module converts the phase current digital signal into current i alpha and current i beta in a two-phase static coordinate system through clark conversion, the current i alpha and the current i beta are comprehensively subjected to Park conversion with a motor rotor position theta, and the current i alpha and the current i beta are converted into direct-axis current id and quadrature-axis current iq in a two-phase rotating coordinate system; on one hand, the control algorithm module carries out high-bandwidth closed-loop control on the rotating speed of a motor rotor through the instruction rotating speed of the motor and the actual rotating speed of the motor rotor, and outputs a quadrature-axis voltage Uq; on the other hand, direct-axis current closed-loop control is carried out by taking 0 direct-axis current as an instruction and taking the direct-axis current id as feedback, and direct-axis voltage Ud is output; the space vector control module converts the direct-axis voltage Ud and the quadrature-axis voltage Uq into voltages Ualpha and Ubeta under a two-phase static coordinate system through inverse park conversion, converts the Ualpha and the Ubeta into motor three-phase switch PWM duty ratios through a space vector control algorithm and transmits the motor three-phase switch PWM duty ratios to the power driving module; and the power driving module drives an internal power device to act according to the PWM duty ratio output by the space vector control module so as to convert direct current bus power supply into motor phase alternating current. According to the technical scheme, the problems that the environmental adaptability of the fuel oil system is reduced and the electromagnetic compatibility and the electrical seaworthiness of the fuel oil system are low due to an existing load disturbance suppression mode are solved.

Description

Technical Field

[0001] The present invention relates to the field of, but not limited to, aviation engine fuel control technology, and in particular to a load disturbance suppression device for an electric fuel pump. Background Art

[0002] In recent years, the research of more-electric / hybrid-electric aircraft engine technology has set off a research boom internationally, and people have conducted research on its key components to varying degrees. The aircraft engine fuel pump control system with an electric fuel pump as the core architecture is one of the key components in the development of more-electric / hybrid-electric engines, and is also regarded by the industry as a major change in the aircraft engine fuel control system.

[0003] Load disturbance suppression performance is crucial to the fuel system of aircraft engines. The existing electric fuel pump system improves the load disturbance suppression performance by increasing the carrier frequency. The existing methods for improving load disturbance suppression performance have the following problems: on the one hand, the increase in carrier frequency will increase the switching loss of power electronic devices, and the power loss of the gate driver will also increase accordingly, which will lead to a decrease in the efficiency of the fuel system, a significant increase in the difficulty of temperature rise control, and a reduction in the environmental adaptability of the fuel system; on the other hand, the increase in carrier frequency will increase the average electromagnetic radiation energy of the fuel system, reducing the electromagnetic compatibility and electrical airworthiness of the fuel system. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a load disturbance suppression device for an electric fuel pump to solve the problem that the existing load disturbance suppression method improves the load disturbance suppression performance by increasing the carrier frequency, which reduces the efficiency of the fuel system and greatly increases the difficulty of temperature rise control, thereby reducing the environmental adaptability of the fuel system, and reducing the electromagnetic compatibility and electrical airworthiness of the fuel system due to the increase in the average electromagnetic radiation energy of the fuel system.

[0005] Technical solution of the present invention: The embodiment of the present invention provides a load disturbance suppression device for an electric fuel pump, comprising: a motor phase current measurement module, a motor rotor position and speed measurement module, a phase current AC-DC conversion module, a control algorithm module, a space vector control module, and a power drive module;

[0006] Among them, the permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module respectively, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module are respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module;

[0007] The motor phase current measurement module is used to collect the phase current of the permanent magnet synchronous motor during operation and convert it into a phase current digital signal, and transmit the phase current digital signal to the phase current AC-DC conversion module;

[0008] The motor rotor position and speed measurement module is used to measure the motor rotor position θ in real time, and calculate the motor rotor speed according to the physical relationship between the motor rotor position θ and the angular velocity. The measured motor rotor position is transmitted to the phase current AC-DC conversion module, and the calculated motor rotor speed is transmitted to the control algorithm module and the host computer as feedback of the motor rotor speed.

[0009] The phase current AC-DC conversion module is used to receive the phase current digital signal transmitted by the motor phase current measurement module, and transform the phase current digital signal into current iα and iβ in a two-phase stationary coordinate system through Clark transformation, and integrate it with the motor rotor position θ transmitted by the motor rotor position and speed measurement module, perform Park transformation, and convert the current iα and iβ into a direct-axis current id and a quadrature-axis current iq in a two-phase rotating coordinate system, and transmit them to the control algorithm module;

[0010] The control algorithm module forms two closed-loop control loops through two groups of input quantities, output quantities and feedback quantities. In one control loop, by receiving the motor command speed output by the external host computer and the actual motor rotor speed output by the motor rotor position and speed measurement module, high-bandwidth closed-loop control of the motor rotor speed is performed, and the quadrature-axis voltage Uq is output; in the other control loop, the 0 direct-axis current is used as the command, and the direct-axis current id output by the phase current AC-DC conversion module is used as feedback to perform direct-axis current closed-loop control, and output the direct-axis voltage Ud; the space vector control module is used to receive the direct-axis voltage Ud and the quadrature-axis voltage Uq output by the control algorithm module, and convert them into voltages Uα and Uβ in a two-phase stationary coordinate system in combination with the motor rotor position θ through inverse park transformation. The space vector control algorithm converts Uα and Uβ into the motor three-phase switch PWM duty cycle, and transmits them to the power drive module;

[0011] The power drive module is used to drive the operation of its internal power devices according to the PWM duty cycle output by the space vector control module, so as to convert the DC bus power supply into the motor phase AC power.

[0012] Optionally, in the load disturbance suppression device of the electric fuel pump as described above, the motor phase current measurement module comprises: a Hall current sensor, an I / V converter, an active filter amplifier, and a synchronous A / D converter and data processor connected in sequence;

[0013] The Hall current sensor is installed in a threading manner, with the motor phase line passing through its measurement center hole in the direction indicated by the sensor. The transformation ratio between the primary current and the secondary output current of the Hall current sensor is 1000:1;

[0014] The I / V converter is composed of four resistors with a resistance value of 100 ohms connected in parallel;

[0015] The active filter amplifier uses a second-order Salley-Key low-pass filter, whose bandwidth, passband gain, and stopband attenuation parameters are adjusted by its internal resistors and capacitors. Its passband gain is 3, the stopband attenuation is 40 dB, and the bandwidth is 1.2*Bs, where Bs is the bandwidth of the Hall current sensor;

[0016] The synchronous A / D conversion and data processor is used to realize synchronous sampling and conversion of three-phase current signals, and converts the sampling data into phase current digital signals in combination with the conversion relationship between the sampling results and the phase currents.

[0017] Optionally, in the load disturbance suppression device of the electric fuel pump as described above, the motor rotor position and speed measurement module includes: a rotary transformer excitation signal generator, a rotary transformer excitation signal conditioner, a rotary transformer, a rotary transformer output signal conditioner, a rotor position resolver, and a speed measurer connected in sequence; and the rotary transformer excitation signal generator is also connected to the rotor position resolver; the rotary transformer excitation signal generator is used to send a sinusoidal signal of a preset frequency and amplitude as an excitation signal;

[0018] The rotary transformer is deployed inside the permanent magnet synchronous motor and rotates synchronously with the motor rotor. It is used to receive the excitation signal and output the sine differential and cosine differential signals. The rotor position resolver calculates the motor rotor position θ based on the relationship between the excitation signal and the sine differential and cosine differential signals output by the rotary transformer.

[0019] The rotary transformer excitation signal conditioner performs high-bandwidth power amplification on the sinusoidal signal of preset frequency and amplitude output by the rotary transformer excitation signal generator, so that the peak-to-peak value of the output excitation signal is amplified to 12V;

[0020] The resolver output signal conditioner is used to condition the resolver output signal into a sine differential signal and a cosine differential signal with a preset peak value;

[0021] The rotor position resolver is used to receive the excitation signal generated by the rotary transformer excitation signal generator, the sine differential signal and the cosine differential signal output by the rotary transformer output signal conditioner, and calculate the motor rotor position θ by an internal decoding algorithm;

[0022] The speed measuring device comprises a differentiator, a low-pass filter and a speed calculator connected in series in sequence; wherein the differentiator performs differential operation according to the motor rotor position θ to calculate the motor rotor angular velocity, and the motor rotor angular velocity contains high-frequency noise introduced by the differential operation; the low-pass filter is a first-order infinite impulse response filter with adaptive cutoff frequency adjustment, and the cutoff frequency fc=n r / 60*2*π*1.2, where n r is the motor command speed, and the rotor angular velocity after filtering by the low-pass filter is recorded as ω; the speed calculator calculates the motor feedback speed in the following way:

[0023] n=ω / (2*π)*60, n is the actual motor rotor speed.

[0024] Optionally, in the load disturbance suppression device for the electric fuel pump as described above, the rotary transformer excitation signal conditioner is composed of an active filter bias circuit and a voltage amplifier circuit connected in series in sequence;

[0025] The active filter bias circuit is used to superimpose a 2V sine signal output by the rotary transformer excitation signal generator with a 2.5V DC bias signal, and then perform a second-order active Chebyshev filter on the superimposed signal. The filter parameters are adjusted by resistors and capacitors, the filter stopband attenuation is configured to -40dB, and the cutoff frequency is configured to 50KHz; the voltage amplifier circuit adjusts the signal to an excitation signal with a peak value of 6V and a peak-to-peak value of 12V by adjusting the amplification parameters;

[0026] The rotary transformer output signal conditioner is composed of an electrostatic protector, an active filter and a signal amplifier connected in series in sequence; wherein the electrostatic protector is used to prevent the damage to the subsequent circuit caused by human body static electricity at the moment of plugging and unplugging the rotary transformer electrical connector; the active filter is a second-order active Chebyshev filter with a DC bias function, and the parameter configuration is consistent with the excitation signal conditioner; the signal amplifier is used to condition the signal with a peak value of 2.6V output by the rotary transformer into a sine differential and cosine differential signal with a peak value of 3.2V.

[0027] Optionally, in the load disturbance suppression device for the electric fuel pump as described above, the phase current AC-DC conversion module comprises: a clark converter and a park converter;

[0028] The Clark converter takes the AC phase current digital signal as input, and converts the AC current in three coordinates into currents iα and iβ in a two-phase stationary coordinate system through equal amplitude transformation; the Park converter receives the currents iα and iβ in the two-phase stationary coordinate system, and converts them into direct-axis current id and quadrature-axis current iq after Park transformation through a park matrix with the motor rotor position θ as a trigonometric function variable. Both id and iq are DC quantities. After two transformations, the three-phase AC current is converted into DC current.

[0029] Optionally, in the load disturbance suppression device of the electric fuel pump as described above, the two closed-loop control loops formed by the control algorithm module through two sets of input quantities, feedback quantities and output quantities respectively include: a motor speed closed-loop control loop and a direct-axis current closed-loop control loop;

[0030] The motor speed closed-loop control loop is based on the motor command speed n r The actual motor rotor speed n is taken as input. In the motor speed closed-loop control loop, the command speed n is first calculated. r The deviation e from the actual speed n n , the deviation is input into the motor speed closed-loop control algorithm unit to calculate the increment ΔUq of the quadrature axis voltage Uq, and after the increment ΔUq is integrally limited, Uq is output; the absolute value of the limiter is set to the DC bus voltage;

[0031] The direct-axis current closed-loop control loop takes the 0 direct-axis current command and the actual direct-axis current id as inputs. In the direct-axis current closed-loop control loop, the deviation e between the 0 direct-axis current command and the actual direct-axis current id is first calculated. id , the deviation is input into the direct-axis current closed-loop control algorithm unit to calculate the increment ΔUd of the direct-axis voltage Ud, and after the increment ΔUd is integrated and limited, Ud is output; the absolute value of the limiter is set to the DC bus voltage.

[0032] Optionally, in the load disturbance suppression device for the electric fuel pump as described above, the control algorithm module includes: a motor speed closed-loop control algorithm unit and a direct-axis current closed-loop control algorithm unit;

[0033] The motor speed closed-loop control algorithm unit is used to control the motor speed according to the motor speed deviation e n High-bandwidth dynamic control and high-precision steady-state control are performed respectively to achieve high-bandwidth and high-precision steady-state control requirements for motor speed control;

[0034] High-bandwidth dynamic control and high-precision steady-state control are two states of the motor speed closed-loop control algorithm. The dynamic steady-state decision mechanism determines whether the algorithm performs high-bandwidth dynamic control or high-precision steady-state control.

[0035] The direct-axis current closed-loop control algorithm unit also adopts a control method that combines dynamic and steady states.

[0036] Optionally, in the load disturbance suppression device of the electric fuel pump as described above, the space vector control module converts the orthogonal DC voltages Ud and Uq into three-phase AC voltages, the inputs are the orthogonal DC voltages Ud and Uq, and the outputs are the three-phase AC voltage values, i.e., the PWM duty cycle values.

[0037] Optionally, in the load disturbance suppression device of the electric fuel pump as described above, the power drive module includes a gate driver and a power tube. The gate driver receives a PWM signal and converts it into a power signal for controlling the switching of the driving power tube. The power tube is switched under the action of the gate driver, thereby adjusting the motor phase voltage and driving the permanent magnet synchronous motor to rotate.

[0038] Optionally, the load disturbance suppression device for the electric fuel pump as described above further includes: a communication module;

[0039] The communication module monitors the motor speed command issued by the host computer in real time, and uploads the actual speed to the host computer in real time.

[0040] Beneficial effects of the invention: The embodiment of the invention provides a load disturbance suppression device for an electric fuel pump, in which the permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module is respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module. The permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module is respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module. The load disturbance suppression device for an electric fuel pump provided by the embodiment of the invention has the following beneficial effects:

[0041] 1) The dual-loop cascade control between the motor rotor speed and the quadrature axis voltage Uq is changed to a single-loop control. By changing the dual-loop to a single-loop control, the bandwidth of the motor speed control is increased, thereby improving the load disturbance suppression performance of the electric fuel pump;

[0042] 3) Enhance the robustness of aircraft engine fuel control systems by improving the load disturbance suppression performance of electric fuel pumps;

[0043] 4) Provides guarantee for the safe operation of aircraft engines.

[0044] To sum up, the load disturbance suppression device for the electric fuel pump provided in the embodiment of the present invention can improve the load disturbance suppression performance of the electric fuel pump and the fuel control stability of the electric fuel pump without increasing the carrier frequency, that is, without reducing the environmental adaptability and electromagnetic compatibility of the fuel system, thereby laying the foundation for the safe and reliable operation of the aircraft engine fuel control system and the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0046] Figure 1 A schematic diagram of the structure of a load disturbance suppression device for an electric fuel pump provided in an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of the structure of a rotary transformer excitation signal conditioner in a load disturbance suppression device for an electric fuel pump provided in an embodiment of the present invention;

[0048] Figure 3 for Figure 2 The schematic diagram of the principle of signal conditioning of the rotary transformer excitation signal conditioner provided in the illustrated embodiment;

[0049] Figure 4 A schematic diagram of the structure of a rotary transformer output signal conditioner in a load disturbance suppression device for an electric fuel pump provided in an embodiment of the present invention;

[0050] Figure 5 for Figure 4 The illustrated embodiment is a schematic diagram of the principle of signal conditioning of a rotary transformer output signal conditioner. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0052] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0053] An embodiment of the present invention provides a load disturbance suppression device for an electric fuel pump, the purpose of which is to implement load disturbance suppression without reducing the environmental adaptability and electromagnetic compatibility of the fuel system, and to enhance the operating safety of the fuel system and the engine by improving the disturbance suppression performance of the electric fuel pump.

[0054] Figure 1 The structure diagram of the load disturbance suppression device of the electric fuel pump provided by the embodiment of the present invention is shown in FIG. Figure 1 As shown, the load disturbance suppression device of the electric fuel pump of the embodiment of the present invention includes: a motor phase current measurement module, a motor rotor position and speed measurement module, a phase current AC-DC conversion module, a control algorithm module, a space vector control module, and a power drive module.

[0055] like Figure 1 In the structure of the load disturbance suppression device shown, the permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module respectively, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module are respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module.

[0056] The motor phase current measurement module in the embodiment of the present invention is used to collect the phase current of the permanent magnet synchronous motor during operation and convert it into a phase current digital signal, and transmit the phase current digital signal to the phase current AC-DC conversion module;

[0057] The motor rotor position and speed measurement module in the embodiment of the present invention is used to measure the motor rotor position θ in real time, and calculate the motor rotor speed based on the physical relationship between the motor rotor position θ and the angular velocity. The measured motor rotor position is transmitted to the phase current AC-DC conversion module, and the calculated motor rotor speed is transmitted to the control algorithm module and the host computer as feedback of the motor rotor speed.

[0058] The phase current AC-DC conversion module in the embodiment of the present invention is used to receive the phase current digital signal transmitted by the motor phase current measurement module, and transform the phase current digital signal into currents iα and iβ in a two-phase stationary coordinate system through Clark transformation, and integrate it with the motor rotor position θ transmitted by the motor rotor position and speed measurement module, perform Park transformation, convert the currents iα and iβ into direct-axis currents id and quadrature-axis currents iq in a two-phase rotating coordinate system, and transmit them to the control algorithm module.

[0059] The control algorithm module in the embodiment of the present invention has two closed-loop control loops. In one control loop, by receiving the motor command speed output by the external host computer and the actual motor rotor speed output by the motor rotor position and speed measurement module, high-bandwidth closed-loop control of the motor rotor speed is performed, and the quadrature-axis voltage Uq is output. In the other control loop, the direct-axis current is closed-loop controlled with the 0 direct-axis current as the instruction and the direct-axis current id output by the phase current AC-DC conversion module as the feedback, and the direct-axis voltage Ud is output. In other words, the control algorithm module forms two closed-loop control loops through its two sets of input quantities, feedback quantities and output quantities, namely the above-mentioned motor speed closed-loop control loop and the direct-axis current closed-loop control loop.

[0060] In the specific implementation, of the two closed-loop control loops of the control algorithm module, one loop has a motor speed closed-loop control algorithm unit, and the other loop has a direct-axis current closed-loop control algorithm unit. The specific algorithm method is: the motor speed closed-loop control algorithm unit calculates the adjustment increment ΔUq of the quadrature-axis voltage Uq based on the deviation between the motor command speed and the actual motor rotor speed; the direct-axis current closed-loop control algorithm unit calculates the adjustment increment ΔUd of the direct-axis voltage Ud based on the deviation between the actual direct-axis current id and 0.

[0061] The space vector control module in the embodiment of the present invention is used to receive the direct-axis voltage Ud and the quadrature-axis voltage Uq output by the control algorithm module, and convert them into voltages Uα and Uβ in a two-phase stationary coordinate system in combination with the motor rotor position θ through inverse park transformation. The space vector control algorithm converts Uα and Uβ into the three-phase switch PWM duty cycle of the motor and transmits them to the power drive module.

[0062] The power driving module in the embodiment of the present invention drives the operation of the internal power devices thereof according to the PWM duty cycle output by the space vector control module, so as to convert the DC bus power supply into the motor phase AC power.

[0063] In addition, the host computer is used to receive the generator speed command to the control algorithm module, and receive the actual motor rotor speed fed back by the motor rotor position and speed measurement module.

[0064] In an implementation of the embodiment of the present invention, the motor phase current measurement module includes: a Hall current sensor, an I / V converter, an active filter amplifier, and a synchronous A / D converter and data processor connected in sequence.

[0065] In this implementation, the Hall current sensor is installed in a thread-through manner, with the motor phase line passing through its measurement center hole in the direction indicated by the sensor. The transformation ratio between the primary current and the secondary output current of the Hall current sensor is 1000:1.

[0066] The I / V converter is composed of four 100 ohm resistors connected in parallel.

[0067] The active filter amplifier adopts a second-order Salley-key low-pass filter, which is composed of an operational amplifier, a resistor and a capacitor. Its bandwidth, passband gain, and stopband attenuation parameters are adjusted by resistors and capacitors. The passband gain is 3, the stopband attenuation is 40dB, and the bandwidth is 1.2*Bs, where Bs is the bandwidth of the Hall current sensor.

[0068] The synchronous A / D converter and data processor is used to realize the synchronous sampling and conversion of the three-phase current signal, and convert the sampling data into a phase current digital signal in combination with the conversion relationship between the sampling result and the phase current.

[0069] In one implementation of an embodiment of the present invention, a motor rotor position and speed measurement module includes: a rotary transformer excitation signal generator (used to emit a 10KHz excitation signal), a rotary transformer excitation signal conditioner, a rotary transformer, a rotary transformer output signal conditioner, a rotor position resolver, and a speed measurer connected in sequence; and the rotary transformer excitation signal generator is also connected to the rotor position resolver.

[0070] In this implementation, the rotary transformer is deployed inside the permanent magnet synchronous motor and rotates synchronously with the motor rotor. It is used to receive the excitation signal and output sine differential and cosine differential signals. The rotor position resolver calculates the motor rotor position θ based on the relationship between the excitation signal and the sine differential and cosine differential signals output by the rotary transformer.

[0071] In a specific implementation, the rotary transformer excitation signal generator is used to emit a 10KHz excitation signal. The excitation signal received by the rotary transformer is a sinusoidal signal with a peak-to-peak value of 12V and a frequency of 10KHz. It outputs sine differential and cosine differential signals, and the transformation ratio between the output signal and the input signal is 0.4.

[0072] In this implementation, the rotary transformer excitation signal conditioner performs high-bandwidth power amplification on the 10KHz, 2V amplitude sinusoidal signal output by the rotary transformer excitation signal generator, so that the peak-to-peak value of the output excitation signal is amplified to 12V.

[0073] In specific implementation, Figure 2As shown, it is a schematic diagram of the structure of the rotary transformer excitation signal conditioner in the load disturbance suppression device of the electric fuel pump provided in an embodiment of the present invention. The rotary transformer excitation signal conditioner is composed of an active filter bias circuit and a voltage amplifier circuit connected in series in sequence; the active filter bias circuit superimposes the 2V amplitude sinusoidal signal output by the rotary transformer excitation signal generator with a 2.5V DC bias signal, and then performs a second-order active Chebyshev filter on the superimposed signal. The filter parameters are adjusted by resistors and capacitors, the filter stopband attenuation is configured to -40dB, and the cutoff frequency is configured to 50KHz; the voltage amplifier circuit adjusts the signal to an excitation signal with a peak value of 6V and a peak-to-peak value of 12V by adjusting the amplification parameters. As shown Figure 3 As shown, Figure 2 The illustrated embodiment provides a schematic diagram of the principle of signal conditioning of a rotary transformer excitation signal conditioner.

[0074] In this implementation, Figure 4 As shown, it is a schematic diagram of the structure of the rotary transformer output signal conditioner in the load disturbance suppression device of the electric fuel pump provided in an embodiment of the present invention. The rotary transformer output signal conditioner is composed of an electrostatic protector, an active filter and a signal amplifier connected in series in sequence; wherein, the electrostatic protector is used to prevent the damage to the subsequent circuit caused by human body static electricity at the moment of plugging and unplugging the rotary transformer electrical connector; the active filter is a second-order active Chebyshev filter with a DC bias function, and the parameter configuration is consistent with the excitation signal conditioner; the signal amplifier is used to condition the 2.6V peak signal output by the rotary transformer into a sine differential and cosine differential signal with a peak value of 3.2V. As shown Figure 5 As shown, Figure 4 The illustrated embodiment is a schematic diagram of the principle of signal conditioning of a rotary transformer output signal conditioner.

[0075] In this implementation, the rotor position resolver is used to receive the excitation signal generated by the rotary transformer excitation signal generator, the sine differential signal and the cosine differential signal output by the rotary transformer output signal conditioner, and calculate the motor rotor position θ by an internal decoding algorithm.

[0076] In this implementation, the speed measuring device is composed of a differentiator, a low-pass filter and a speed calculator connected in series. The differentiator performs differential operation according to the motor rotor position θ to calculate the motor rotor angular velocity, but this angular velocity contains high-frequency noise introduced by the differential operation; the low-pass filter is a first-order infinite impulse response filter with adaptive cutoff frequency adjustment, and the cutoff frequency fc=n r / 60*2*π*1.2, where nr is the motor command speed and the filtered rotor angular velocity is ω; the speed calculator calculates the motor feedback speed in the following way: n=ω / (2*π)*60, where n is the actual motor rotor speed.

[0077] In an implementation manner of the embodiment of the present invention, the phase current AC-DC conversion module includes: a Clark converter and a Park converter.

[0078] In this implementation, the Clark converter takes the AC phase current digital signal as input, and converts the AC current in three coordinates into currents iα and iβ in a two-phase stationary coordinate system through equal amplitude transformation; the Park converter receives the currents iα and iβ in the two-phase stationary coordinate system, and converts them into direct-axis current id and quadrature-axis current iq after Park transformation through the Park matrix with the motor rotor position θ as the trigonometric function variable. Both id and iq are DC quantities. After two transformations, the three-phase AC current is converted into DC current.

[0079] In one implementation of the present invention, the two closed-loop control loops formed by the control algorithm module through two groups of input quantities, feedback quantities and output quantities include: a motor speed closed-loop control loop and a direct-axis current closed-loop control loop.

[0080] The motor speed closed-loop control loop of this implementation is based on the motor command speed n r The actual motor rotor speed n is taken as input. In the motor speed closed-loop control loop, the command speed n is first calculated. r The deviation e from the actual speed n n , the deviation is input into the motor speed closed-loop control algorithm unit to calculate the increment ΔUq of the quadrature axis voltage Uq, and after the increment ΔUq is integrally limited, Uq is output; the absolute value of the limiter is set to the DC bus voltage;

[0081] The direct-axis current closed-loop control loop of this implementation mode takes the 0 direct-axis current command and the actual direct-axis current id as input. In the direct-axis current closed-loop control loop, the deviation e between the 0 direct-axis current command and the actual direct-axis current id is first calculated. id , the deviation is input into the direct-axis current closed-loop control algorithm unit to calculate the increment ΔUd of the direct-axis voltage Ud, and after the increment ΔUd is integrated and limited, Ud is output; the absolute value of the limiter is set to the DC bus voltage.

[0082] In one implementation of the embodiment of the present invention, the implementation of the motor speed closed-loop control algorithm unit and the direct-axis current closed-loop control algorithm unit in the control algorithm module is described:

[0083] (1) The motor speed closed-loop control algorithm unit is used to control the motor speed according to the motor speed deviation e in order to meet the high bandwidth and high-precision steady-state control requirements of the motor speed control. n Perform high-bandwidth dynamic control and high-precision steady-state control respectively;

[0084] It should be noted that high-bandwidth dynamic control and high-precision steady-state control are two states of the motor speed closed-loop control algorithm, and the dynamic steady-state state decision mechanism determines whether the algorithm performs high-bandwidth dynamic control or high-precision steady-state control. In the specific implementation, the decision mechanism is:

[0085] Use the ping-pong algorithm to n To identify, n Once the absolute value falls into a certain neighborhood, such as |e n |>30, the control state switches to dynamic; if e n The absolute value continues to fall into a certain neighborhood, such as |e n |<25 If this condition is met three times in a row, the control state switches to steady state.

[0086] Among them, the high-bandwidth dynamic control adopts a sliding mode controller. In order to improve the dynamic response speed, an exponential sliding mode is used to approximate the deviation. The sliding mode function is defined as y = e x -1, where x is the input deviation and y is the output increment.

[0087] Among them, high-precision steady-state control also uses a sliding mode controller. In order to improve the control stability, a linear sliding surface is used for deviation approximation. The sliding mode function is defined as y=k*x, k=0.5.

[0088] (2) The direct-axis current closed-loop control algorithm unit also adopts a control method that combines dynamic and steady-state control. The controller uses a sliding mode controller. The dynamic and steady-state decision-making mechanism and control parameter settings are consistent with the motor speed closed-loop control algorithm unit.

[0089] In one implementation of an embodiment of the present invention, the space vector control module converts the orthogonal DC voltage (including Ud and Uq) into a three-phase AC voltage, the input is the orthogonal DC voltage Ud and Uq, and the output is the three-phase AC voltage value, that is, the PWM duty cycle value.

[0090] In one implementation of an embodiment of the present invention, the power drive module includes a gate driver and a power tube. The gate driver receives a PWM signal and converts it into a power signal for controlling the switching of the driving power tube. The power tube is switched under the action of the gate driver, thereby adjusting the motor phase voltage and driving the permanent magnet synchronous motor to rotate.

[0091] In one implementation of an embodiment of the present invention, the load disturbance suppression device of the electric fuel pump is characterized in that it also includes: a communication module; the communication module monitors the motor speed command issued by the host computer in real time, and uploads the actual speed to the host computer in real time.

[0092] The load disturbance suppression device of the electric fuel pump provided by the embodiment of the present invention, in which the permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module is respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module. The permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module is respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module. The load disturbance suppression device of the electric fuel pump provided by the embodiment of the present invention has the following beneficial effects:

[0093] 1) The dual-loop cascade control between the motor rotor speed and the quadrature axis voltage Uq is changed to a single-loop control. By changing the dual-loop to a single-loop control, the bandwidth of the motor speed control is increased, thereby improving the load disturbance suppression performance of the electric fuel pump;

[0094] 3) Enhance the robustness of aircraft engine fuel control systems by improving the load disturbance suppression performance of electric fuel pumps;

[0095] 4) Provides guarantee for the safe operation of aircraft engines.

[0096] To sum up, the load disturbance suppression device for the electric fuel pump provided in the embodiment of the present invention can improve the load disturbance suppression performance of the electric fuel pump and the fuel control stability of the electric fuel pump without increasing the carrier frequency, that is, without reducing the environmental adaptability and electromagnetic compatibility of the fuel system, thereby laying the foundation for the safe and reliable operation of the aircraft engine fuel control system and the engine.

[0097] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A load disturbance suppression device for an electric fuel pump, characterized in that: include: Motor phase current measurement module, motor rotor position and speed measurement module, phase current AC-DC conversion module, control algorithm module, space vector control module, power drive module; Among them, the permanent magnet synchronous motor is connected to the input end of the phase current AC-DC conversion module through the motor phase current measurement module and the motor rotor position and speed measurement module respectively, and the output end of the motor rotor position and speed measurement module is also connected to the control algorithm module and the external host computer; the output end of the external host computer and the phase current AC-DC conversion module are respectively connected to the control algorithm module; the control algorithm module is connected to the permanent magnet synchronous motor via the space vector control module and the power drive module; The motor phase current measurement module is used to collect the phase current of the permanent magnet synchronous motor during operation and convert it into a phase current digital signal, and transmit the phase current digital signal to the phase current AC-DC conversion module; The motor rotor position and speed measurement module is used to measure the motor rotor position θ in real time, and calculate the motor rotor speed according to the physical relationship between the motor rotor position θ and the angular velocity. The measured motor rotor position is transmitted to the phase current AC-DC conversion module, and the calculated motor rotor speed is transmitted to the control algorithm module and the host computer as feedback of the motor rotor speed. The phase current AC-DC conversion module is used to receive the phase current digital signal transmitted by the motor phase current measurement module, and transform the phase current digital signal into current iα and iβ in a two-phase stationary coordinate system through Clark transformation, and integrate it with the motor rotor position θ transmitted by the motor rotor position and speed measurement module, perform Park transformation, and convert the current iα and iβ into a direct-axis current id and a quadrature-axis current iq in a two-phase rotating coordinate system, and transmit them to the control algorithm module; The control algorithm module forms two closed-loop control loops through two groups of input quantities, output quantities and feedback quantities. In one control loop, by receiving the motor command speed output by the external host computer and the actual motor rotor speed output by the motor rotor position and speed measurement module, high-bandwidth closed-loop control of the motor rotor speed is performed, and the quadrature-axis voltage Uq is output; in the other control loop, the 0 direct-axis current is used as the command, and the direct-axis current id output by the phase current AC-DC conversion module is used as feedback to perform direct-axis current closed-loop control, and output the direct-axis voltage Ud; the space vector control module is used to receive the direct-axis voltage Ud and the quadrature-axis voltage Uq output by the control algorithm module, and convert them into voltages Uα and Uβ in a two-phase stationary coordinate system in combination with the motor rotor position θ through inverse park transformation. The space vector control algorithm converts Uα and Uβ into the motor three-phase switch PWM duty cycle, and transmits them to the power drive module; The power drive module is used to drive the operation of its internal power devices according to the PWM duty cycle output by the space vector control module, so as to convert the DC bus power supply into the motor phase AC power.

2. The load disturbance suppression device for an electric fuel pump according to claim 1, characterized in that: The motor phase current measurement module includes: a Hall current sensor, an I / V converter, an active filter amplifier, and a synchronous A / D converter and data processor connected in sequence; The Hall current sensor is installed in a threading manner, with the motor phase line passing through its measurement center hole in the direction indicated by the sensor. The transformation ratio between the primary current and the secondary output current of the Hall current sensor is 1000:1; The I / V converter is composed of four resistors with a resistance value of 100 ohms connected in parallel; The active filter amplifier uses a second-order Salley-Key low-pass filter, whose bandwidth, passband gain, and stopband attenuation parameters are adjusted by its internal resistors and capacitors. Its passband gain is 3, the stopband attenuation is 40 dB, and the bandwidth is 1.2*Bs, where Bs is the bandwidth of the Hall current sensor; The synchronous A / D conversion and data processor is used to realize synchronous sampling and conversion of three-phase current signals, and converts the sampling data into phase current digital signals in combination with the conversion relationship between the sampling results and the phase currents.

3. The load disturbance suppression device for an electric fuel pump according to claim 1, characterized in that: The motor rotor position and speed measurement module comprises: a rotary transformer excitation signal generator, a rotary transformer excitation signal conditioner, a rotary transformer, a rotary transformer output signal conditioner, a rotor position resolver, and a speed measurer connected in sequence; and the rotary transformer excitation signal generator is also connected to the rotor position resolver; the rotary transformer excitation signal generator is used to send a sinusoidal signal of a preset frequency and amplitude as an excitation signal; The rotary transformer is deployed inside the permanent magnet synchronous motor and rotates synchronously with the motor rotor. It is used to receive the excitation signal and output the sine differential and cosine differential signals. The rotor position resolver calculates the motor rotor position θ based on the relationship between the excitation signal and the sine differential and cosine differential signals output by the rotary transformer. The rotary transformer excitation signal conditioner performs high-bandwidth power amplification on the sinusoidal signal of preset frequency and amplitude output by the rotary transformer excitation signal generator, so that the peak-to-peak value of the output excitation signal is amplified to 12V; The resolver output signal conditioner is used to condition the resolver output signal into a sine differential signal and a cosine differential signal with a preset peak value; The rotor position resolver is used to receive the excitation signal generated by the rotary transformer excitation signal generator, the sine differential signal and the cosine differential signal output by the rotary transformer output signal conditioner, and calculate the motor rotor position θ by an internal decoding algorithm; The speed measuring device comprises a differentiator, a low-pass filter and a speed calculator connected in series in sequence; wherein the differentiator performs differential operation according to the motor rotor position θ to calculate the motor rotor angular velocity, and the motor rotor angular velocity contains high-frequency noise introduced by the differential operation; the low-pass filter is a first-order infinite impulse response filter with adaptive cutoff frequency adjustment, and the cutoff frequency fc=n r / 60*2*π*1.2, where n r is the motor command speed, and the rotor angular velocity after filtering by the low-pass filter is recorded as ω; the speed calculator calculates the motor feedback speed in the following way: n=ω / (2*π)*60, n is the actual motor rotor speed.

4. The load disturbance suppression device for an electric fuel pump according to claim 3, characterized in that: The rotary transformer excitation signal conditioner is composed of an active filter bias circuit and a voltage amplifier circuit connected in series in sequence; The active filter bias circuit is used to superimpose a 2V sine signal output by the rotary transformer excitation signal generator with a 2.5V DC bias signal, and then perform a second-order active Chebyshev filter on the superimposed signal. The filter parameters are adjusted by resistors and capacitors, the filter stopband attenuation is configured to -40dB, and the cutoff frequency is configured to 50KHz; the voltage amplifier circuit adjusts the signal to an excitation signal with a peak value of 6V and a peak-to-peak value of 12V by adjusting the amplification parameters; The rotary transformer output signal conditioner is composed of an electrostatic protector, an active filter and a signal amplifier connected in series in sequence; wherein the electrostatic protector is used to prevent the damage to the subsequent circuit caused by human body static electricity at the moment of plugging and unplugging the rotary transformer electrical connector; the active filter is a second-order active Chebyshev filter with a DC bias function, and the parameter configuration is consistent with the excitation signal conditioner; the signal amplifier is used to condition the signal with a peak value of 2.6V output by the rotary transformer into a sine differential and cosine differential signal with a peak value of 3.2V.

5. The load disturbance suppression device for an electric fuel pump according to claim 1, characterized in that: The phase current AC-DC conversion module includes: a Clark converter and a Park converter; The Clark converter takes the AC phase current digital signal as input, and converts the AC current in three coordinates into currents iα and iβ in a two-phase stationary coordinate system through equal amplitude transformation; the Park converter receives the currents iα and iβ in the two-phase stationary coordinate system, and converts them into direct-axis current id and quadrature-axis current iq after Park transformation through a park matrix with the motor rotor position θ as a trigonometric function variable. Both id and iq are DC quantities. After two transformations, the three-phase AC current is converted into DC current.

6. The load disturbance suppression device for an electric fuel pump according to claim 1, characterized in that: The control algorithm module forms two closed-loop control loops through two sets of input quantities, feedback quantities and output quantities, including: a motor speed closed-loop control loop and a direct-axis current closed-loop control loop; The motor speed closed-loop control loop is based on the motor command speed n r The actual motor rotor speed n is taken as input. In the motor speed closed-loop control loop, the command speed n is first calculated. r The deviation e from the actual speed n n , the deviation is input into the motor speed closed-loop control algorithm unit to calculate the increment ΔUq of the quadrature axis voltage Uq, and after the increment ΔUq is integrally limited, Uq is output; the absolute value of the limiter is set to the DC bus voltage; The direct-axis current closed-loop control loop takes the 0 direct-axis current command and the actual direct-axis current id as inputs. In the direct-axis current closed-loop control loop, the deviation e between the 0 direct-axis current command and the actual direct-axis current id is first calculated. id , the deviation is input into the direct-axis current closed-loop control algorithm unit to calculate the increment ΔUd of the direct-axis voltage Ud, and after the increment ΔUd is integrated and limited, Ud is output; the absolute value of the limiter is set to the DC bus voltage.

7. The load disturbance suppression device for an electric fuel pump according to claim 6, characterized in that: The control algorithm module includes: a motor speed closed-loop control algorithm unit and a direct-axis current closed-loop control algorithm unit; The motor speed closed-loop control algorithm unit is used to control the motor speed according to the motor speed deviation e n High-bandwidth dynamic control and high-precision steady-state control are performed respectively to achieve high-bandwidth and high-precision steady-state control requirements for motor speed control; High-bandwidth dynamic control and high-precision steady-state control are two states of the motor speed closed-loop control algorithm. The dynamic steady-state decision mechanism determines whether the algorithm performs high-bandwidth dynamic control or high-precision steady-state control. The direct-axis current closed-loop control algorithm unit also adopts a control method that combines dynamic and steady states.

8. The load disturbance suppression device for an electric fuel pump according to any one of claims 1 to 7, characterized in that: The space vector control module converts the orthogonal DC voltages Ud and Uq into three-phase AC voltages, the inputs are the orthogonal DC voltages Ud and Uq, and the outputs are the three-phase AC voltage values, namely, the PWM duty cycle values.

9. The load disturbance suppression device for an electric fuel pump according to any one of claims 1 to 7, characterized in that: The power drive module includes a gate driver and a power tube. The gate driver receives a PWM signal and converts it into a power signal for controlling the switching of the driving power tube. The power tube is switched under the action of the gate driver, thereby adjusting the motor phase voltage and driving the permanent magnet synchronous motor to rotate.

10. The load disturbance suppression device for an electric fuel pump according to any one of claims 1 to 7, characterized in that: Also includes: Communication module; The communication module monitors the motor speed command issued by the host computer in real time, and uploads the actual speed to the host computer in real time.

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