Flow-rotating speed calibration and flow control method for electric fuel pump

Abstract

The invention discloses an electric fuel pump flow-rotating speed calibration and flow control method, and belongs to the field of aero-engine fuel flow control. The calibration method comprises the steps that a current fuel mass flow demand value is received; converting the fuel mass flow demand value into a fuel volume flow according to the fuel density corresponding to the current fuel temperature; and calculating the rotating speed of the motor according to the inlet pressure and outlet pressure of the electric fuel pump, the fuel temperature and the fuel volume flow. According to the method, the influence of the fuel oil density on the internal leakage rate is considered, and in the flow-rotating speed calibration calculation process, the fuel oil density is represented through the temperature T to participate in fitting of a polynomial, so that the electric fuel oil pump has flow-rotating speed calibration in a wider temperature domain range, and the actual flight environment requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of fuel flow control for aero-engines, and particularly to a method for calibrating the flow rate - rotational speed and controlling the flow rate of an electric fuel pump. Background Art

[0002] As an important direction in the development of aviation technology, the technology of more - electric aircraft is continuously promoting the improvement of aircraft design and performance. With the continuous progress of technology, more - electric aircraft will play an increasingly important role in the future aviation field. The huge technical advantages of more - electric aircraft highlight the shortcomings of the existing mechanical - hydraulic fuel regulation system, and there is an urgent need to develop an engine fuel control system that better meets the development needs of more - electric aircraft. The electric fuel pump can adjust the power output in real - time according to the engine operating conditions, with relatively high power utilization rate, fewer system components, and simple pipelines, which improves the reliability of the system to a certain extent.

[0003] The outer loop of the electric fuel pump is for flow control. However, on the one hand, the intervention of the flow sensor generates pressure loss, resulting in a reduction in system efficiency; on the other hand, the response of the traditional flow sensor is much lower than that of the motor speed control response, which will limit the fast - response ability of the electric fuel pump. For the flow - control method of an electric fuel pump without a flow sensor, the invention patent with the publication number CN114718737A and the name "An open - loop control method for the flow rate of an electric fuel pump" discloses an open - loop control method that calculates the internal leakage volume using the differential pressure of a gear pump and supplements the internal leakage volume in the flow command; the invention patent with the publication number CN116146357A and the name "A feed - forward control method for an electric fuel pump" discloses a feed - forward control method that obtains the set rotational speed by polynomial fitting according to the fuel volume flow rate and the differential pressure between the inlet and outlet; the invention patent with the publication number CN116146483A and the name "A composite control method for an electric fuel pump" discloses a composite control method that performs closed - loop control on the set rotational speed after polynomial fitting. The above - mentioned existing technologies have realized the real - time flow - rate feedback measurement without a flow sensor to a certain extent, but none of them consider the influence of the change in the volumetric efficiency of the pump caused by the extreme high / low temperature environment during high - altitude flight, and cannot be effectively applied to the flow - rate - rotational speed estimation in a wide - temperature - range flight environment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems of the existing technology and provide a method for calibrating the flow rate - rotational speed and controlling the flow rate of an electric fuel pump.

[0005] The purpose of the present invention is achieved through the following technical solutions: A method for calibrating the flow rate - rotational speed of an electric fuel pump, the method comprising the following steps:

[0006] Receive the current fuel mass flow rate demand value;

[0007] Convert the fuel mass flow demand value into a fuel volume flow according to the fuel density corresponding to the current fuel temperature;

[0008] Calculate the motor speed according to the inlet pressure and outlet pressure of the electric fuel pump, the fuel temperature, and the fuel volume flow.

[0009] In one example, the corresponding relationship between the fuel density and the fuel temperature is:

[0010] ρ = ρ ref -β(T - T ref );

[0011] where ρ is the fuel density; ρ ref is the fuel density at the reference temperature T ref ; T represents the fuel temperature; β is the temperature coefficient of the fuel density.

[0012] In one example, the calculation expression of the motor speed is:

[0013] n = c1 + c2·Q v_ref + c3·P in + c4·P out + c5·T + c6·(P out - P in ) 2 + c7·Q v_ref 2 ;

[0014] where n represents the motor speed corresponding to the volume flow; c1, c2, c3, c4, c5, c6, c7 are all polynomial coefficients; Q v_ref represents the fuel volume flow; P in represents the inlet pressure of the electric fuel pump; P out represents the outlet pressure of the electric fuel pump; T represents the fuel temperature.

[0015] In one example, before the step of calculating the motor speed, it further includes:

[0016] Judge whether the collected inlet pressure and outlet pressure of the electric fuel pump and the fuel temperature are valid. If valid, calculate the motor speed and update the flow-speed calibration value; if invalid, obtain the motor speed corresponding to the current fuel volume flow according to the flow-speed calibration table.

[0017] In one example, after judging that the collected inlet pressure and outlet pressure of the electric fuel pump and the fuel temperature are valid, it further includes:

[0018] Judge whether the change values of the inlet pressure and outlet pressure of the electric fuel pump and the change value of the fuel temperature are greater than the threshold. If greater, calculate the motor speed and update the flow-speed calibration value.

[0019] It should be further noted that the technical features corresponding to the above calibration method examples can be combined or replaced with each other to form a new technical solution.

[0020] The present invention further includes an electric fuel pump flow control method, which is implemented based on the calibration method formed by any one of the above examples or a combination of multiple examples. The control method includes the following steps:

[0021] Taking the motor speed as the target speed for speed closed-loop control;

[0022] Calculating the speed increment;

[0023] Outputting the speed increment as the speed closed-loop control quantity to reach the target speed, thereby controlling the flow rate of the electric fuel pump.

[0024] In one example, the motor speed is the motor speed corresponding to the fuel volume flow rate obtained according to the flow rate - speed calibration table.

[0025] In one example, the speed increment is the difference between the motor feedback speed and the target speed.

[0026] In one example, the calculation frequency of the speed closed-loop control is higher than the update frequency of the flow rate - speed calibration.

[0027] It should be further noted that the technical features corresponding to the above control method examples can be combined or replaced with each other to form a new technical solution.

[0028] The present invention further includes an electronic device, including a memory and a processor. A computer instruction that can run on the processor is stored on the memory. When the processor runs the computer instruction, it executes the steps of the electric fuel pump flow rate - speed calibration method formed by any one of the above examples or a combination of multiple examples.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. In one example, the influence of fuel density on the internal leakage is considered. During the flow rate - speed calibration calculation process, the fuel density is characterized by temperature T and participates in the polynomial fitting, so that the electric fuel pump has a flow rate - speed calibration with a wider temperature range to meet the requirements of the actual flight environment.

[0031] 2. In one example, the present invention judges whether the acquisition of data (pump inlet and outlet pressures, fuel temperature) fails. If it is effective, the motor speed is calculated and the flow rate - speed calibration value is updated at the same time; if it fails, the previous calibration value is retained, and the motor speed is continuously output through two parallel motor speed calculation methods, realizing reliable fuel pump flow control, ensuring flight safety, and reducing the system failure rate caused by the failure of the data acquisition sensor.

[0032] 3. In one example, the motor speed v ref is used as the control target quantity in the subsequent rotational speed closed-loop control. The rotational speed closed-loop control does not need to rely on the calculated motor speed n for feedforward or cascade operation, and directly obtains the motor speed v according to the flow-rate - rotational speed calibration table ref to perform rotational speed closed-loop control, which can improve the operation efficiency and decouple the sensor acquisition and the electric fuel pump control process, thereby reducing the system failure rate caused by sensor failure. At the same time, directly performing rotational speed closed-loop control by querying the flow-rate - rotational speed calibration value responds faster than the scheme of performing rotational speed operation after reading the sensor value, ensuring the calculation efficiency and meeting the requirements of the fast response of the electric fuel pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following further describes in detail the specific embodiments of the present invention with reference to the drawings. The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used to represent the same or similar parts in these drawings. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0034] Figure 1 is the control schematic diagram of the electric fuel pump provided by an example of the present invention;

[0035] Figure 2 is the method flow chart provided by an example of the present invention;

[0036] Figure 3 is the method flow chart provided by a preferred example of the present invention.

[0037] In the figure: 1.1 - rotational speed calculation module; 1.2 - flow-rate calibration module; 2.1 - encoder; 2.2 - drive motor; 3 - gear pump; 4 - fuel tank; 5 - temperature sensor; 6 - inlet pressure sensor; 7 - safety valve; 8 - outlet pressure sensor; 9 - fuel nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following clearly and completely describes the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The electric fuel pump involved in the flow - speed calibration and flow control method of an electric fuel pump in the present invention is a gear pump. A controller is used to control the speed of the motor, and finally achieve the purpose of regulating the flow rate. The control principle of the electric fuel pump of the present invention is as Figure 1 shown, and it includes a controller, a motor, a gear pump 3, a fuel tank 4, a temperature sensor 5, an inlet pressure sensor 6, a safety valve 7, an outlet pressure sensor 8, and a fuel nozzle 9. The controller is connected to the motor, the motor is connected to the gear pump 3, and the fuel tank 4, the gear pump 3, and the fuel nozzle 9 are connected in sequence. Among them, the controller is used to adjust the speed of the motor. The fuel tank 4 provides an oil source for the gear pump 3, the driving motor 2.2 drives the gear pump 3 to rotate, and then supplies fuel to the engine through the fuel nozzle 9. During this working process, the output flow rate of the electric fuel pump is affected by adjusting the speed of the driving motor by the controller. That is, when the speed of the driving motor increases, the amount of fuel inhaled and output per unit time will also increase correspondingly; when the speed of the motor decreases, the amount of fuel output per unit time decreases, and the flow rate also decreases accordingly.

[0043] More specifically, a temperature sensor 5 and an inlet pressure sensor 6 are provided on the inlet pipeline between the fuel tank 4 and the gear pump 3, and an outlet pressure sensor 8 is provided on the outlet pipeline between the gear pump 3 and the fuel nozzle 9. A safety valve 7 is connected in parallel to the gear pump 3, and the safety valve 7 is used for relieving pressure when the system is overpressured. Further, the controller includes a rotation speed calculation module 1.1 and a flow rate calibration module 1.2. The rotation speed calculation module 1.1 is used to set the current control rotation speed target value and perform closed-loop rotation speed control in combination with the feedback rotation speed. The flow rate calibration module 1.2 is used to calculate and store the flow rate-rotation speed calibration value in real time. The motor includes an encoder 2.1 and a drive motor 2.2. The encoder 2.1 can be replaced by a position information acquisition device such as a Hall sensor to collect the rotor position information of the motor. Specifically, the drive motor 2.2 is controlled by the rotation speed calculation module 1.1 to perform rotation speed actions, and the encoder 2.1 is connected to the rotation speed calculation module 1.1. The rotation speed calculation module 1.1 obtains the rotor position information of the motor through the encoder 2.1 and then calculates the current motor rotation speed. The rotation speed calculation module 1.1 is connected to the temperature sensor 5, the inlet pressure sensor 6, and the outlet pressure sensor 8 to obtain the inlet and outlet pressures of the electric fuel pump and the fuel temperature.

[0044] In one example, a method for calibrating the flow rate-rotation speed of an electric fuel pump is as Figure 1 shown, and the method includes the following steps:

[0045] S1: Receive the current fuel mass flow rate demand value.

[0046] Specifically, the controller receives the current fuel mass flow rate demand value Q issued by the vehicle total controller m_ref .

[0047] S2: Convert the fuel mass flow rate demand value into a fuel volume flow rate according to the fuel density corresponding to the current fuel temperature.

[0048] Specifically, the current fuel temperature T is collected by the temperature sensor, and the corresponding fuel density ρ is obtained by looking up the table according to the current fuel temperature T. More specifically, the mapping relationship between the fuel density ρ and the fuel temperature T in the table is:

[0049] ρ = ρ ref -β(T - T ref )

[0050] where ρ ref is the fuel density at the reference temperature T ref ; β is the temperature coefficient of the fuel density.

[0051] Further, the calculation expression of the fuel volume flow rate Q v_ref is:

[0052]

[0053] S3: Calculate the motor speed based on the inlet pressure, outlet pressure, fuel temperature, and fuel volume flow rate of the electric fuel pump. Specifically, the actual fuel supply volume Q of the gear pump is usually expressed as the product of the theoretical fuel supply volume Q T and the volumetric efficiency η, i.e.:

[0054] Q = Q T ·η;

[0055] Q T = n·q L ;

[0056] where q L represents the displacement; n represents the motor speed.

[0057] In engineering applications, the volumetric efficiency η is usually determined through experiments. The flow losses that cause changes in the volumetric efficiency mainly include internal leakage losses, filling losses, etc. The values of internal leakage losses and filling losses are affected by multiple conditions such as clearance size, operating conditions, and oil temperature. The internal leakage loss caused by the clearance is equivalent to a throttle orifice, and the calculation expression for the loss flow rate q is:

[0058]

[0059] where C d is the throttle coefficient, usually obtained through experiments; A M is the equivalent throttle orifice area; ΔP is the pressure difference between the inlet and outlet of the electric fuel pump. It can be seen that the volumetric efficiency η of the gear pump is related to the changes in the oil density ρ brought about by the inlet / outlet pressure P in , P out and the fuel temperature T. The present invention makes full use of the inlet / outlet pressure sensors and fuel temperature sensors to collect the inlet / outlet pressures P in , P out and the fuel temperature T, and by establishing a calibration of flow rate (fuel volume flow rate) - speed (motor speed), it can still provide an accurate flow rate - speed relationship for the controller in an environment with a wide oil pressure range and a wide temperature range.

[0060] In addition, there are usually pressure sensors and temperature sensors in the fuel supply system, and the response times of the pressure sensors and temperature sensors are much shorter than those of traditional flow sensors. Without adding additional equipment, the motor speed provided by the present invention based on the flow rate - speed calibration value can meet the fast response requirements of subsequent speed closed - loop control.

[0061] In one example, the calculation expression for the motor speed n is:

[0062] n = c1 + c2·Q v_ref + c3·P in + c4·P out+ c5·T + c6·(P out - P in ) 2 + c7·Q v_ref 2

[0063] Among them, c1, c2, c3, c4, c5, c6, and c7 are all polynomial coefficients, obtained by fitting offline test data; P in represents the inlet pressure of the electric fuel pump; P out represents the outlet pressure of the electric fuel pump. In this motor speed expression, the fuel temperature term c5·T is used to substitute into the polynomial calculation to characterize the numerical influence relationship of the fuel density change caused by the fuel temperature change on the flow rate - speed calibration. In this example, the motor speed is calculated by collecting the pump inlet / outlet pressures and fuel temperature, and then the flow rate - speed calibration is updated, so that more accurate pump dynamics and flow characteristics are obtained in the wide - range environment of high / low temperature and high / low oil pressure, and the environmental adaptability is strong.

[0064] Optionally, the flow rate - speed calibration can also be carried out by establishing a deep learning network for offline test data and other methods. Using Q v_ref , P in , P out as parameter inputs and the rotational speed n as the parameter output, the deep learning network is trained offline to obtain the corresponding relationship between Q v_ref and the rotational speed n.

[0065] In one example, before the step of calculating the motor speed, it further includes:

[0066] Judging whether the inlet pressure P in of the electric fuel pump and the outlet pressure P out collected by the sensor, and the fuel temperature T are valid. If valid, calculate the motor speed n corresponding to the fuel volume flow rate according to the pump inlet pressure P in , the outlet pressure P out , and the fuel temperature T, and update the flow rate - speed calibration value; if invalid, such as the pressure value and temperature value collected by the sensor exceeding the range, abnormal pressure change and temperature change, sensor failure, etc., all these situations can be recognized as invalid data acquisition. At this time, report the sensor failure and retain the previous calibration value, that is, obtain the motor speed v corresponding to the fuel volume flow rate according to the saved flow rate - speed calibration table ref , and no longer update the flow rate - speed calibration. Among them, both the motor speed n and the motor speed v ref can be written into the controller as the control target quantity in the subsequent rotational speed closed - loop control. Preferably, the motor speed v ref is used as the control target quantity in the subsequent rotational speed closed - loop control.

[0067] In one example, after determining that the collected inlet pressure, outlet pressure, and fuel temperature of the electric fuel pump are valid, it further includes:

[0068] Determine whether the change values of the inlet pressure and outlet pressure of the electric fuel pump and the change value of the fuel temperature are greater than the threshold Δ. If so, calculate the motor speed and update the flow - speed calibration value. At this time, it is preferably to set a threshold for the change value of the pump inlet pressure, the change value of the pump outlet pressure, and the change value of the fuel temperature respectively. Among them, the threshold Δ can be obtained through offline tests. The test method is as follows: when the change range of the flow - speed relationship caused by the change value of the sensor acquisition value exceeding the threshold is such that the flow - speed calibration error ≥ 1%, update the calculation of the flow - speed calibration. That is, when the change values of the inlet / outlet pressure sensors and the change value of the temperature sensor result in a flow - speed calibration error ≥ 1%, determine the threshold Δ. Preferably, based on the change values corresponding to when the flow - speed calibration error is equal to 1% caused by the inlet and outlet pressures and the fuel change values, take it as the threshold Δ, thereby reducing the calculation load of the flow - speed calibration.

[0069] Combining the above examples, the preferred calibration method of the present invention is obtained, including the following steps:

[0070] S1’: Receive the current fuel mass flow demand value Q m_ref ;

[0071] S2’: Obtain the inlet pressure P of the fuel pump in and the outlet pressure P out , and the fuel temperature T, and determine whether the sensor data is valid. If valid, enter step S31’. If invalid, report the sensor fault and retain the previous calibration value, and do not update the flow - speed calibration, and enter step S32’. That is, steps S31’ and S32’ are parallel operations;

[0072] At the same time, convert the fuel mass flow demand value Q m_ref into the fuel volume flow Q v_ref according to the fuel density ρ corresponding to the current fuel temperature T;

[0073] S31’: Calculate the motor speed n corresponding to the fuel volume flow Q in according to the inlet pressure P of the fuel pump out and the outlet pressure P v_ref , and the fuel temperature T, and update the flow - speed calibration;

[0074] S32’: Obtain the motor speed v v_ref corresponding to the fuel volume flow Q ref according to the saved flow - speed calibration table.

[0075] The present invention further includes a method for controlling the flow rate of an electric fuel pump. This method uses the calibration method formed by any one of the above examples or a combination of multiple examples to obtain the motor speed. At this time, the control method includes the following steps:

[0076] S4: Write the motor speed as the target speed value of the speed closed-loop control into the controller.

[0077] The motor speed can be the motor speed n corresponding to calculating the fuel volume flow rate Q according to the inlet pressure P in of the fuel pump and the outlet pressure P out and the fuel temperature T, or it can be the motor speed v corresponding to obtaining the fuel volume flow rate Q according to the stored flow rate - speed calibration table. v_ref v_ref ref .

[0078] Furthermore, in the existing flow control method, the motor speed n calculated according to the previous stage is used as the feedforward. At this time, the control system corresponding to the control method is a series system. The calculation expression of the reliability R(t) of the series system is:

[0079]

[0080] Among them, R1(t), R2(t),..., R i (t) are the reliabilities of each component respectively, and can be expressed by the following formula:

[0081]

[0082] Among them, λ i is the failure rate of the i-th component. The components include sensors, controllers, etc. When the sensor fails and cannot complete the flow control, it will lead to control failure and even flight failure. In addition, all the existing technical solutions for participating in the operation of fuel pump flow estimation are cascade control, that is, the flow estimation value is used as the feedforward or compensation. When the sensor fails, it will also directly lead to control failure and even flight failure. The update of the flow rate - speed relationship calibrated through experimental data mostly occurs when the environmental parameters change and there is a non-linear corresponding relationship change. The present invention performs parallel operations through two motor speed calculation methods. Under the requirement of real-time updating of the flow rate - speed corresponding relationship, if a sensor failure occurs, the previous calibration value is retained and the fault is reported. Subsequently, the flow rate - speed corresponding relationship no longer updates the calibration with the change of environmental parameters, and still can output the required flow rate, ensuring flight safety and reducing the system failure rate caused by sensor failure.

[0083] S5: Calculate the speed increment.

[0084] When calculating the speed increment, the PID control method can be used, with the motor speed v ref as the target value of the control quantity and the motor feedback speed v​​real is the current value of the control quantity. The rotational speed increment Δv is obtained through PID closed-loop calculation. That is, the calculation expression of the rotational speed increment Δv is:

[0085] Δv = v real - v ref ;

[0086] wherein, the motor feedback rotational speed v real is fed back by position acquisition devices such as Hall sensors and encoders.

[0087] S6: Output the rotational speed increment as the rotational speed closed-loop control quantity to reach the target rotational speed, thereby controlling the flow rate of the electric fuel pump.

[0088] In an example, the motor rotational speed n is calculated at a fixed frequency to update the flow rate - rotational speed calibration, and the rotational speed closed-loop control calculation frequency is higher than the flow rate - rotational speed calibration update frequency.

[0089] Combining the above examples, a preferred example of the flow control method of the present invention is obtained. As Figure 3 shown, at this time, the method includes the following steps:

[0090] S10: Receive the current fuel mass flow rate demand value Q issued by the master control instruction m_ref ;

[0091] S20: Obtain the inlet pressure P of the fuel pump in and the outlet pressure P out , the fuel temperature T, and determine whether the sensor data is valid. If it is valid, enter step S301. If it is invalid, report the sensor fault and retain the previous calibration value, and do not update the flow rate - rotational speed calibration, and enter step S302. That is, steps S301 and S302 are parallel operations;

[0092] Meanwhile, according to the fuel density ρ corresponding to the current fuel temperature T, convert the fuel mass flow rate demand value Q m_ref into the fuel volume flow rate Q v_ref ;

[0093] S301: Calculate the motor rotational speed n corresponding to the fuel volume flow rate Q according to the inlet pressure P of the fuel pump in and the outlet pressure P out , the fuel temperature T, and update the flow rate - rotational speed calibration; v_ref

[0094] S302: Obtain the motor rotational speed v corresponding to the fuel volume flow rate Q according to the saved flow rate - rotational speed calibration table v_ref ref ; ref ;

[0095] S40: Write the motor rotational speed as the target rotational speed value of the rotational speed closed-loop control into the controller;

[0096] S50: Calculate the rotational speed increment Δv using a closed-loop control calculation method;

[0097] S60: Output the rotational speed increment Δv as a control quantity to reach the target rotational speed and control the fuel pump flow rate.

[0098] The present invention takes into account the change in fuel density caused by the change in temperature value, and further identifies the influence on the pump volumetric efficiency, so as to improve the accuracy of flow rate estimation; at the same time, the present invention uses pressure signals and temperature signals as parameters, and can be adapted to the flow rate - rotational speed estimation in the flight environment with a wide temperature range (-50°C to +70°C) and a wide oil pressure range.

[0099] Furthermore, in the prior art, the flow rate estimation value based on sensor parameters is directly involved in rotational speed control as feedforward or feedback. In the cascade control method, the failure of the sensor will directly cause the system to fail. In the present invention, the acquisition of the target rotational speed and the closed-loop control are performed in parallel with the flow rate - rotational speed calibration, and under the control requirement of fast response, the system failure rate caused by sensor failure is reduced.

[0100] The present invention also provides an electronic device, which has the same inventive concept as any example or combination of multiple examples corresponding to the above-mentioned method for calibrating the flow rate - rotational speed of an electric fuel pump, including a memory and a processor. A computer instruction that can run on the processor is stored on the memory, and when the processor runs the computer instruction, it executes the steps of the above-mentioned method for calibrating the flow rate - rotational speed of an electric fuel pump. The processor can be a single-core or multi-core central processing unit or a specific integrated circuit, or an integrated circuit configured to implement one or more of the present invention.

[0101] In one example, the electronic device is presented in the form of a general computing device. The components of the electronic device may include, but are not limited to: the above-mentioned at least one processing unit (processor), the above-mentioned at least one storage unit, and a bus connecting different system components (including the storage unit and the processing unit).

[0102] Among them, the storage unit stores program code, and the program code can be executed by the processing unit, so that the processing unit executes the steps according to various exemplary embodiments of the present invention described in the above-mentioned "exemplary method" section. For example, the processing unit can execute the above-mentioned method for calibrating the flow rate - rotational speed of an electric fuel pump.

[0103] The storage unit may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 3201 and / or a cache storage unit, and may further include a read-only storage unit (ROM).

[0104] The storage unit may also include a program / utilities having a set (at least one) of program modules, such program modules including but not limited to: an operating system, one or more application programs, other program modules, and program data, and implementation of a network environment may be included in each or some combination of these examples.

[0105] The bus may represent one or more of several types of bus structures, including a storage unit bus or storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0106] The electronic device may also communicate with one or more external devices (such as a keyboard, a pointing device, a Bluetooth device, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device, and / or communicate with any device (such as a router, a modem, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication may be through an input / output (I / O) interface. Also, the electronic device may communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter. The network adapter communicates with other modules of the electronic device through the bus. It should be understood that other hardware and / or software modules may be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0107] Through the above description of the manner, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or can be implemented by a combination of software and necessary hardware. Therefore, the technical solution according to this exemplary embodiment can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a portable hard drive, etc.) or on a network, including several instructions to enable a computing device (which may be a personal computer, a server, an electronic device, or a network device, etc.) to execute the method of the exemplary embodiment of the present application.

[0108] The above specific embodiments are detailed descriptions of the present invention. It cannot be determined that the specific embodiments of the present invention are only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions and substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for calibrating flow rate and speed of an electric fuel pump, characterized in that: The following steps are involved: Receive current fuel mass flow demand value; The fuel mass flow demand value is converted into the fuel volume flow rate according to the fuel density corresponding to the current fuel temperature; The motor speed is calculated based on the inlet and outlet pressures of the electric fuel pump, the fuel temperature, and the fuel volume flow rate.

2. The electric fuel pump flow-speed calibration method according to claim 1, characterized in that: The corresponding relationship between the fuel density and the fuel temperature is: p=p ref -β(TT ref ); Where, ρ is the fuel density; ρ ref is the reference temperature T ref The fuel density at ; T represents the fuel temperature; β is the temperature coefficient of the fuel density.

3. The electric fuel pump flow-speed calibration method according to claim 1, characterized in that: The calculation expression of the motor speed is: n=c1+c2·Q v_ref +c3·P in +c4·P out +c5·T+c6·(P out -P in ) 2 +c7·Q v_ref 2 ; Where n represents the motor speed corresponding to the volume flow rate; c1, c2, c3, c4, c5, c6, c7 are all polynomial coefficients; Q v_ref Indicates the fuel volume flow rate; P in Indicates the inlet pressure of the electric fuel pump; P out Indicates the outlet pressure of the electric fuel pump; T indicates the fuel temperature.

4. The method for calibrating flow rate and speed of an electric fuel pump according to claim 1, characterized in that: Before calculating the motor speed step, it also includes: Determine whether the collected electric fuel pump inlet pressure, outlet pressure and fuel temperature are valid. If valid, calculate the motor speed and update the flow-speed calibration value; if invalid, obtain the motor speed corresponding to the current fuel volume flow according to the flow-speed calibration table.

5. The method for calibrating flow rate and speed of an electric fuel pump according to claim 4, characterized in that: After judging that the collected electric fuel pump inlet pressure, outlet pressure and fuel temperature are valid, it also includes: Determine whether the change values ​​of the inlet pressure and outlet pressure of the electric fuel pump and the change value of the fuel temperature are greater than the threshold value. If so, calculate the motor speed and update the flow-speed calibration value.

6. A method for controlling flow of an electric fuel pump, characterized in that: The motor speed is obtained by using the calibration method according to any one of claims 1 to 4, and the control method comprises the following steps: The motor speed is used as the target speed for speed closed-loop control; Calculate the speed increment; The speed increment is output as the speed closed-loop control quantity to achieve the target speed, thereby controlling the flow of the electric fuel pump.

7. The electric fuel pump flow control method according to claim 6, characterized in that: The motor speed is the motor speed corresponding to the fuel volume flow rate obtained according to the flow-speed calibration table.

8. The electric fuel pump flow control method according to claim 6, characterized in that: The speed increment is the difference between the motor feedback speed and the target speed.

9. The electric fuel pump flow control method according to claim 6, characterized in that: The speed closed-loop control calculation frequency is higher than the flow-speed calibration update frequency.

10. An electronic device comprising a memory and a processor, wherein the memory stores computer instructions that can be executed on the processor, wherein: The processor executes the steps of the electric fuel pump flow-speed calibration method described in any one of claims 1-5 when running the computer instructions, or executes the steps of the electric fuel pump flow control method described in any one of claims 6-9 when running the computer instructions.

Images