CN115483853A - Engine power generation system and control method thereof - Google Patents

Abstract

The embodiment of the invention provides an engine power generation system and a control method thereof, wherein the control method comprises the steps of obtaining the feedback rotating speed of a generator and the reference rotating speed of the engine, which are detected at the zero crossing point or the natural commutation point of a generator winding, obtaining a voltage regulating variable by adopting a PID algorithm according to the feedback rotating speed of the generator and the reference rotating speed of the engine, and regulating charging voltage according to the voltage regulating variable; determining the current torque of a generator according to the feedback current of the generator, obtaining a current regulation variable according to the current torque of the generator and the reference torque of the engine by adopting a PID (proportion integration differentiation) algorithm, and regulating the charging current according to the current regulation variable; the method comprises the steps of obtaining the current charging/power utilization requirement and the feedback voltage of a generator, and adjusting a charging load according to the current charging/power utilization requirement and the feedback voltage of the generator.

Description

Engine power generation system and control method thereof

technical field

The invention relates to the technical field of engine power generation, in particular to an engine power generation system and a control method thereof.

Background technique

With the progress of society, people's awareness of environmental protection and energy saving has increased, and the travel and lifestyle of "low carbon, environmental protection and green" have gradually attracted great attention. The research on high-efficiency, environment-friendly and energy-saving engine power generation has aroused great attention from manufacturers all over the world.

In the traditional engine power generation system, the engine and the power generation system are relatively isolated from each other. The engine is usually adjusted to one or several fixed speeds, which is not well matched with the torque and generator feedback.

Contents of the invention

In order to solve the existing technical problems, the present invention provides an engine power generation system capable of coordinating the high-efficiency and energy-saving control of the generator and the engine.

In order to achieve the above object, the technical solution of the embodiment of the present invention is achieved in this way:

A method for controlling power generation of an engine, comprising:

Obtain the feedback speed of the generator and the reference speed of the engine detected at the zero-crossing point or the natural commutation point of the generator winding, use the PID algorithm to obtain the voltage adjustment variable according to the feedback speed of the generator and the reference speed of the engine, and obtain the voltage adjustment variable according to the voltage The manipulated variable regulates the charging/consumption voltage;

Determine the current torque of the generator according to the feedback current of the generator, use the PID algorithm to obtain the current adjustment variable according to the current generator torque and the engine reference torque, and adjust the current for charging/power consumption according to the current adjustment variable;

Obtain the current charging/power demand and generator feedback voltage, and adjust the charging load according to the current charging/power demand and the generator feedback voltage.

Wherein, the method also includes:

According to the current charging/electricity demand and the rotational speed of the engine, the generating voltage is adjusted, and voltage boosting or voltage reduction is performed as required.

Wherein, the method also includes:

The collected phase current of the generator winding and the current charging current detected by the current detection circuit are obtained, and the feedback current of the generator is obtained according to the phase current and the current charging current.

Wherein, the method also includes:

Based on the isofuel consumption curve of the engine, an engine reference speed and an engine reference torque under optimal fuel consumption are determined, and the engine reference speed and the engine reference torque are used as reference target values for control.

Wherein, the method also includes:

According to the current charging/power demand, start-stop control is performed on the starter motor and the fuel pump of the engine, and the processor in the generator system is respectively connected with the motor, throttle and fuel pump of the engine through control lines.

The engine power generation control method provided in the above embodiments adjusts the charging voltage, charging current, and charging load of the generator by integrating the engine reference speed and engine reference torque, and the current charging/power demand, intelligently adjusts and adapts the engine speed and Torque, so that the engine can keep working in the best fuel consumption range, so that by coordinating the engine and generator to fully meet the charging power demand, to achieve the purpose of high efficiency and energy saving control.

An engine power generation system, including an engine, a generator system connected to the engine, and a battery management system connected to the generator system, the generator system includes a generator connected to the engine through a connecting shaft, a processor, A rectification circuit connected between the processor and the generator winding, a voltage feedback circuit and a current detection circuit connected between the rectification circuit and the processor, the rectification circuit includes a connection with the generator winding Each correspondingly connected upper bridge arm circuit and lower bridge arm circuit, the upper bridge arm circuit is a chopper circuit, and the lower bridge arm circuit is a switch circuit connected between the processor and the chopper circuit , the chopper circuit includes upper bridge elements that are respectively connected to each of the generator windings, the switch circuit includes lower bridge elements that are respectively connected to the upper bridge elements, and the upper bridge elements are controllable silicon or a field effect transistor, the lower bridge element is a field effect transistor or a diode, or a thyristor.

Wherein, the rotor of the generator is a pure permanent magnet rotor, and the stator is a single winding.

Wherein, the generator works in a power generation mode or an electric mode, and in the electric mode, the generator is used to drive the engine to start or assist the axle.

Wherein, the generator system further includes a current regulator or a load regulator connected between the processor and the battery management system.

Wherein, the generator is a three-phase generator, and the chopper circuit includes a first thyristor, a second silicon controlled rectifier and a second thyristor respectively connected to the A-phase coil, B-phase coil and C-phase coil of the three-phase generator winding. A thyristor and a third thyristor; or, the chopper circuit includes a single field effect transistor or a reverse series connected to the A-phase coil, B-phase coil, and C-phase coil of the three-phase generator winding respectively Two FETs connected;

The switch circuit includes a first switch, a second switch, and a third switch respectively connected to the first thyristor, the second thyristor, and the third thyristor, and the processor communicates with the first thyristor through the switch drive circuit. The first switch, the second switch and the third switch are connected, and the first switch, the second switch and the third switch are all the field effect transistors.

The engine power generation system provided in the above embodiments includes an engine, a generator system connected to the engine, and a battery management system connected to the generator system. The engine is connected to the generator through a coupling, and the generator system is connected to the generator system through the battery management system. Real-time acquisition of charging power demand, the rectifier circuit includes the upper bridge arm circuit and the lower bridge arm circuit correspondingly connected to the generator windings, through the setting of the switch circuit in the lower bridge arm of each phase winding, the chopper circuit and the lower bridge arm circuit can be adjusted accordingly To turn on or off the branch circuit formed by the switch circuit, adjust the on-off time of the thyristor and the switch circuit to adjust the current output current and the current rectified voltage, so that the generator system can Coordinate the engine and generator to fully meet the charging power demand, to achieve the purpose of high efficiency and energy saving control.

Description of drawings

Fig. 1 is a logic block diagram of an engine generating system in an embodiment;

Fig. 2 is a schematic diagram of an engine power generation system provided by an embodiment;

Fig. 3 is the schematic diagram of generator system in an embodiment;

Fig. 4 is the schematic diagram of generator system in another embodiment;

FIG. 5 is a flow chart of a method for controlling power generation of an engine in an embodiment;

Fig. 6 is a logical schematic diagram of a generator power generation control method in an embodiment;

Fig. 7 is a schematic diagram of the universal characteristics of the constant fuel consumption rate line adopted by the regulating engine in an embodiment;

Figure 8 is a graph of the overall efficiency of the system.

detailed description

The technical solution of the present application will be further elaborated below in combination with the accompanying drawings and specific embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the implementation of the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

1 and 2, the engine power generation system includes an engine 20, a generator system connected to the engine 20 and a battery management system 30 connected to the generator system, and the generator system includes a battery management system connected to the engine 20 A generator 10 connected by a coupling, a processor 12, a rectification circuit connected between the processor 12 and the generator winding, a voltage feedback circuit 14 connected between the rectification circuit and the processor 12 and a current detection circuit 13, the rectifier circuit includes an upper bridge arm circuit and a lower bridge arm circuit connected to each of the generator windings, the upper bridge arm circuit is a chopper circuit 15, and the lower bridge arm circuit The circuit is a switch circuit 16 connected between the processor 12 and the chopper circuit 15, the chopper circuit 15 includes upper bridge elements respectively connected to each of the generator windings, the switch The circuit 16 includes lower bridge elements respectively connected to the upper bridge elements, the upper bridge elements are thyristors or field effect transistors, and the lower bridge elements are field effect transistors or diodes, or thyristors.

In the above embodiment, the engine 20 is connected to the generator 10 through a coupling, and the generator system obtains the charging electricity demand in real time through the battery management system 30, and the rectifier circuit includes an upper bridge arm circuit and a In the lower bridge arm circuit, through the setting of the switch circuit 16 in the lower bridge arm of each phase winding, the conduction or disconnection of the branch formed by the chopper circuit 15 and the switch circuit 16 can be adjusted accordingly, and the thyristor and the controlled rectifier can be adjusted. The on-off time of the switching circuit 16 is used to adjust the current output current and the current rectified voltage, so that the generator system can coordinate the engine 20 and the generator 10 to fully meet the charging power demand, and achieve high efficiency and energy-saving control. Purpose. Secondly, through the setting of the switch circuit 16 in the lower bridge arm of each phase winding, the opening or closing of the switch circuit 16 can correspondingly adjust the conduction or disconnection of the branch circuit formed by the chopper circuit 15 and the switch circuit 16, thereby reducing The loss caused by the voltage drop of the chopper circuit 15 and the switch circuit 16 in the positive and negative half cycles of each phase current.

In this embodiment, the lower bridge element in the switch circuit 16 is preferably a field effect transistor. Compared with a diode, using a field effect transistor can reduce the conduction voltage drop and improve power generation efficiency.

The generator 10 is a three-phase generator, and the chopper circuit 15 includes a first thyristor SCR1, a first thyristor SCR1, and a first SCR1 respectively connected correspondingly to the A-phase coil, B-phase coil, and C-phase coil of the three-phase generator winding. Two thyristor SCR2 and the third thyristor SCR3. The switch circuit 16 includes a first switch, a second switch, and a third switch respectively connected to the first thyristor SCR1, the second thyristor SCR2, and the third thyristor SCR3, and the processor 12 The first switch, the second switch and the third switch are connected to the first switch, the second switch and the third switch through a switch driving circuit, and the first switch, the second switch and the third switch are respectively field effect transistors. The processor 12 includes a plurality of input/output terminals, and the switch circuit 16 is connected between the input/output terminals of the processor 12 and the chopping circuit 15. The input/output terminals are respectively identified as a seventh input/output terminal I/O7, an eighth input/output terminal I/O8 and a ninth input/output terminal I/O9. The first switch is connected between the seventh input/output terminal I/O7 and the first thyristor SCR1, the second switch is connected between the eighth input/output terminal I/O8 and the second thyristor SCR2, and the third The switch is connected between the ninth input/output terminal I/O9 and the third thyristor SCR3. When the processor 12 detects that the phase voltage of the generator winding is in the positive half cycle of the sine wave through the phase commutation detection circuit 17, the processor 12 outputs a chopping control signal to switch on and off the thyristor of the upper bridge arm of the corresponding phase for voltage regulation. When the processor 12 detects that the phase voltage is at the commutation point through the commutation detection circuit 17, it outputs drive signals respectively through the first input/output terminal, the second input/output terminal and the third input/output terminal to turn on the corresponding phase The switch of the lower bridge arm, the branch formed by the silicon controlled rectifier and the corresponding switch are turned on, so that the loss caused by the voltage drop can be reduced, and the rectification efficiency can be improved. In some embodiments, the chopper circuit 15 includes a single field effect transistor that is respectively connected to the A-phase coil, the B-phase coil, and the C-phase coil of the three-phase generator winding, or the chopper circuit 15 includes field effect transistors connected in reverse series to the A-phase coil, B-phase coil and C-phase coil of the three-phase generator winding respectively.

In another optional embodiment, referring to FIG. 3 , the first switch includes a first field effect transistor Q1 and a second field effect transistor Q2 connected in parallel, and the second switch includes a third field effect transistor Q2 connected in parallel. The effect transistor Q3 and the fourth field effect transistor Q4, and the third switch includes a fifth field effect transistor Q5 and a sixth field effect transistor Q6 connected in parallel. In the lower bridge arm circuit, the switches corresponding to each switch adopt multiple field effect transistors connected in parallel, which can greatly increase the on-state current when the field effect transistors are turned on, thereby further reducing losses and improving rectification efficiency. Wherein, the processor 12 includes a plurality of feedback terminals. For ease of description and distinction, the feedback terminal connected to the processor 12 and the voltage feedback circuit 14 is identified as the first feedback terminal AD1, and the feedback terminal connected to the processor 12 and the current detection circuit 13 is identified as the first feedback terminal AD1. The end is identified as the second feedback end AD2. The processor 12 can detect the current current output by the rectifier circuit in real time through the current detection circuit 13, and detect the current voltage output by the rectifier circuit in real time through the voltage feedback circuit 14. When the commutation detection circuit 17 detects that the phase voltage is in the positive half cycle of the sine wave, According to the voltage feedback of the rectified output and the output current detection value, a matched chopper control signal is output to the thyristor of the upper bridge arm of the corresponding phase for voltage regulation.

Optionally, the phase commutation detection circuit 17 includes multiple circuits corresponding to each phase in the generator winding. Wherein, the processor 12 includes a plurality of input/output terminals, and the commutation detection circuit 17 is connected between the input/output terminals of the processor 12 and the generator windings. For ease of description and distinction, the processor 12 and the chopper drive circuit The connected plurality of input/output terminals are identified as a seventh input/output terminal, an eighth input/output terminal and a ninth input/output terminal. The commutation detection circuit 17 includes a first input/output terminal I/O1 connected to the processor 12, a second input/output terminal I/O2, and a third input/output terminal I/O3, which are connected to Hall sensors or windings A and B , C. By setting commutation detection circuits 17 corresponding to each phase one by one, it is possible to independently detect and judge the commutation point and positive and negative half cycles of each phase, thereby improving control accuracy.

Optionally, the generator system further includes a chopper drive circuit connected between the processor 12 and the chopper circuit 15 . The processor 12 outputs a PWM chopping control signal to the chopping drive circuit, and controls the switching of the thyristors of the upper bridge arms of each phase through the chopping drive circuit. Wherein, the processor 12 includes a plurality of input/output terminals, and the chopping drive circuit is connected between the input/output terminals of the processor 12 and the chopping circuit 15. For ease of description and distinction, the processor 12 and the chopping drive circuit are The connected multiple inputs/outputs are identified as a fourth input/output I/O4, a fifth input/output I/O5 and a sixth input/output I/O6. Optionally, the rectifier circuit further includes a switch driving circuit connected between the processor 12 and each switch, and the processor 12 passes the seventh input/output terminal I/O7, the eighth input/output terminal I/O8 and the ninth input The /output terminal I/O9 respectively outputs drive signals to the switch drive circuit, and the switch drive circuit controls the switches of the lower bridge arms of each phase to be turned on or off.

The rotor of the generator 10 adopts a pure permanent magnet rotor, the magnets can be mounted on the surface or embedded with permanent magnets (IPM), and the stator is a single winding, which does not require excitation, and has a simple and efficient structure. Optionally, the processor 12 in the generator system is respectively connected to the starter motor, throttle and fuel pump of the engine 20 through control lines. Wherein, the throttle is a linear throttle, a two-speed throttle or a one-speed throttle. Among them, the linear throttle means that the throttle can be changed linearly, which is realized by an electronic governor, or an electronically controlled throttle, or an adjustable electric fuel injection. The two-speed throttle means that the throttle is only set at idle speed and the maximum 2nd gear, which is controlled by the switch solenoid valve. When starting and stopping, the throttle is in the idle gear. When the throttle is pushed to the maximum, the load is adjusted to the maximum correspondingly to maintain the optimal speed. The first gear throttle means that the throttle is always at the maximum, and the load is adjusted to the maximum after starting, and the engine is stopped by stopping the fuel pump.

Optionally, the generator works in a generating mode or an electric mode, and in the electric mode, the generator is used to drive the engine to start or assist the axle. The generator can be switched between different working modes to meet the needs of more application scenarios.

Optionally, the generator system further includes a current regulator or a load regulator connected between the processor 12 and the battery management system 30 . When the torque of the engine 20 exceeds the optimal torque of the engine 20, the current regulator may be a current limiter, and the generator system limits the current through the current limiter. The battery management system 30 is correspondingly connected to the battery array 11, and can determine the number of connected batteries according to the current charging/power demand.

Optionally, the commutation detection circuit 17 can be a zero-crossing detection circuit, which detects the zero-crossing information of the phase voltage of the generator winding, and determines the A-phase, B-phase, and C-phase three-phase winding voltages according to the detected zero-crossing information phase relationship. Optionally, the commutation signal detected by the commutation detection circuit 17 may also be a natural commutation point signal, and the natural commutation point signal refers to a position 30 degrees ahead of the zero-crossing point of the electromotive force. The commutation detection circuit 17 can be detected by a Hall sensor (Hall element). For example, when the commutation signal is a zero-crossing signal, the commutation detection circuit 17 can be installed at the position of the electromotive force zero-crossing point of each phase winding by using a Hall element. When the commutation signal is a natural commutation point signal, the commutation detection circuit 17 can be installed at a position 30 degrees before the zero-crossing position of the electromotive force using a Hall element. Optionally, the commutation detection circuit 17 may also use a voltage acquisition circuit to collect the phase voltages of the three-phase windings, and compare the phase voltages with the voltages at the center points of the three phases to obtain zero-crossing points or natural commutation points.

Optionally, the generator system further includes a phase current detection circuit 13 connected in series with the lower bridge element of one phase of the generator winding. In this embodiment, the phase current detection circuit 13 includes a sampling resistor connected in series with the lower bridge element correspondingly connected to the A-phase winding.

Please refer to Fig. 4, each upper bridge element can use two N-channel field effect transistors whose drain and source are connected in opposite directions, and have the function of step-up and step-down of the circuit when generating power. When the motor is driven, this circuit can be used for PWM speed regulation of the motor. At this time, Q4, Q5, and Q6 are in a continuous conduction state, relying on the six field effects of A0, A', B0, B', C0, and C' The PWM control of the tube is used for speed regulation drive.

Please refer to FIG. 5 and FIG. 6. In another aspect of the embodiment of the present application, a method for controlling power generation of an engine is also provided, which is applied to a processor, and the method includes:

S101. Obtain the generator feedback speed and engine reference speed detected at the zero-crossing point or natural commutation point of the generator winding, and use the PID algorithm to obtain the voltage adjustment variable according to the generator feedback speed and the engine reference speed. The voltage adjustment variable adjusts the charging voltage or the voltage of the electricity used.

Among them, the speed feedback is obtained from the zero-crossing point or commutation detection of the generator. Speed control can be based on PID processing of reference speed and feedback speed with corresponding output voltage regulation variable.

S103, determine the current torque of the generator according to the feedback current of the generator, use the PID algorithm to obtain a current adjustment variable according to the current generator torque and the reference torque of the engine, and adjust the charging current or the electric current according to the current adjustment variable.

Among them, the torque of the generator is directly proportional to the current. Optionally, the method further includes: acquiring the collected phase current of the generator winding and the current charging current detected by the current detection circuit, and obtaining the generator feedback current according to the phase current and the current charging current, In this way, the current feedback is obtained from the charging current and the phase current, and the acquisition of the phase current can make the calculation of the torque more accurate. Among them, stabilizing the current can further stabilize the engine speed. Compared with adjusting the throttle alone, the speed is more stable, which can reduce fuel consumption, reduce vibration and noise, and improve emissions.

S105. Obtain the current charging/power demand and the feedback voltage of the generator, and adjust the charging load according to the current charging/power demand and the feedback voltage of the generator.

Among them, the processor can interact with the battery management system to switch the number and combination of battery arrays to be charged, so as to adjust the charging load accordingly. If the battery array is charged step by step in batches, the charging load will be small, and if it is charged simultaneously, the charging load will be large. By adjusting the number of battery packs charged, the impedance and current of the charging circuit will change accordingly.

The engine power generation control method provided in the above embodiments adjusts the charging voltage and charging current, the voltage or current of power consumption, and the charging load of the generator by integrating the engine reference speed and engine reference torque, and the current charging/power demand. , intelligently adjust and adapt the speed and torque of the engine, so that the engine can keep working in the best fuel consumption range. In this way, by coordinating the engine and generator to fully meet the charging power demand, to achieve the purpose of high-efficiency and energy-saving control, by coordinating the engine And the torque of the generator to achieve the engine speed and torque in the best fuel consumption range, the fluctuation is also small, and it can fully meet the demand.

Among them, the generator and control circuit can be integrated together, with high efficiency and high power density. Optionally, the method further includes: adjusting the power generation voltage according to the current charging/power consumption demand and the rotational speed of the engine, and performing step-up or step-down regulation as required. The power generation voltage is adjusted according to the current charging/power demand and the engine speed to ensure that the charging voltage is adjusted appropriately and within the optimal range. By adjusting the charging voltage, the charging current and the phase current of the generator winding can be changed accordingly.

Optionally, the method further includes: step-up and step-down regulation of the output voltage, and boost step-up by PWM chopping of the lower bridge FET when the rotation speed is very low. When the electromotive force is too high, the conduction angle of the upper bridge thyristor can be controlled to reduce the voltage. It can ensure a good power supply output in a large speed range.

Optionally, the method further includes: determining an engine reference speed and an engine reference torque at optimal fuel consumption based on an isofuel consumption curve of the engine, and using the engine reference speed and the engine reference torque as reference target values for control. Please refer to Figure 7, which is a schematic diagram of the universal characteristics of the constant fuel consumption curve adopted by the engine. Determine the most efficient constant fuel consumption curve 0.27L/kwh in the constant fuel consumption curve to indicate the best fuel consumption, and then adjust the speed and torque at this In or around the fuel consumption coil. The engine reference speed and the engine reference torque can be obtained from the optimum fuel consumption area determined by the most efficient fuel consumption contour.

According to the weight processing of charging power demand and optimal fuel consumption, the optimal torque can be obtained. The factors to be considered are: meet the charging demand in time, protect the battery (no discharge, no charge), maintain the torque and speed of the engine in the best fuel consumption range, and try to stabilize the speed, charging current and voltage as much as possible.

When the demand for charging power becomes larger or smaller, the speed and torque of the engine are adjusted to the maximum or minimum part of the power in the optimal area.

Optionally, the method further includes: controlling the starting motor and the fuel pump of the engine to start and stop according to the current charging/power demand, and the processor in the generator system communicates with the motor of the engine and the fuel pump respectively through control lines. Throttle and fuel pump connections. Through the linkage control of the starter motor and the fuel supply pump of the engine, the automatic start and stop according to the demand for charging electricity can simplify the fuel supply system, instead of using electronically controlled throttle, electronic injection, electronically controlled fuel pump, etc., only a simple throttle or The mechanical pump can be realized, and when the engine adopts the electronically controlled variable throttle, the working range of the best fuel consumption can be expanded.

Optionally, the method further includes: combining the fuel consumption efficiency map of the engine and the efficiency map of the generator to obtain an overall efficiency curve of the system, and adjusting the torque and speed accordingly, so that the engine and the generator are in a system operating within the range of maximum efficiency, see Figure 8.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. An engine power generation control method characterized by comprising:

acquiring a generator feedback rotating speed and an engine reference rotating speed detected at a zero crossing point or a natural commutation point of a generator winding, obtaining a voltage regulating variable by adopting a PID algorithm according to the generator feedback rotating speed and the engine reference rotating speed, and regulating a charging voltage or a power utilization voltage according to the voltage regulating variable;

determining the current torque of a generator according to the feedback current of the generator, obtaining a current regulation variable according to the current torque of the generator and the reference torque of the engine by adopting a PID (proportion integration differentiation) algorithm, and regulating the charging current or the current of power utilization according to the current regulation variable;

the method comprises the steps of obtaining the current charging/power utilization requirement and the feedback voltage of a generator, and adjusting a charging load according to the current charging/power utilization requirement and the feedback voltage of the generator.

2. The engine power generation control method according to claim 1, characterized by further comprising:

and regulating the generated voltage according to the current charging/power utilization requirement and the rotating speed of the engine, and performing boosting or reducing regulation according to the requirement.

3. The engine power generation control method according to claim 1, characterized by further comprising:

the method comprises the steps of acquiring collected phase current of a generator winding and current charging current detected by a current detection circuit, and obtaining feedback current of the generator according to the phase current and the current charging current.

4. The engine power generation control method according to claim 1, characterized by further comprising:

and determining an engine reference rotating speed and an engine reference torque under the optimal oil consumption based on an equal oil consumption curve of the engine, and taking the engine reference rotating speed and the engine reference torque as reference target values of control.

5. The engine power generation control method according to claim 1, characterized by further comprising:

and controlling starting and stopping of a starting motor and a fuel pump of the engine according to the current charging/power utilization requirement, wherein a processor in the generator system is respectively connected with the motor, the accelerator and the fuel pump of the engine through control lines.

6. An engine power generation system is characterized by comprising an engine, a generator system connected with the engine and a battery management system connected with the generator system, wherein the generator system comprises a generator connected with the engine through a connecting shaft, a processor, a rectifying circuit connected between the processor and a generator winding, a voltage feedback circuit and a current detection circuit connected between the rectifying circuit and the processor, the rectifying circuit comprises an upper bridge arm circuit and a lower bridge arm circuit which are correspondingly connected with the generator winding, the upper bridge arm circuit is a chopper circuit, the lower bridge arm circuit is a switch circuit connected between the processor and the chopper circuit, the chopper circuit comprises an upper bridge element and a lower bridge element, the upper bridge element is a silicon controlled rectifier or a field effect transistor, and the lower bridge element is a field effect transistor or a diode or a silicon controlled rectifier.

7. An engine power generation system according to claim 6, wherein the rotor of the generator is a pure permanent magnet rotor and the stator is a single sub-winding.

8. An engine power generation system according to claim 6, wherein the generator operates in a generating mode of operation or an electric mode of operation in which the generator is used to power the engine start or power axle.

9. An engine power generation system according to claim 6, wherein said generator system further comprises a current regulator or load regulator connected between said processor and said battery management system.

10. The engine power generation system of claim 6, wherein the generator is a three-phase generator, and the chopper circuit includes a first thyristor, a second thyristor, and a third thyristor connected to a phase a coil, a phase B coil, and a phase C coil of the three-phase generator winding, respectively; or the chopper circuit comprises a single field effect tube or two field effect tubes which are reversely connected in series and correspondingly connected with an A-phase coil, a B-phase coil and a C-phase coil of the three-phase generator winding respectively;

the switching circuit comprises a first switch, a second switch and a third switch which are correspondingly connected with the first controllable silicon, the second controllable silicon and the third controllable silicon respectively, the processor is connected with the first switch, the second switch and the third switch through a switch driving circuit, and the first switch, the second switch and the third switch are all field effect transistors.

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