An oil-saving control system for an inverter generator and an inverter generator

Abstract

The utility model provides a kind of inverter generator oil-saving control system and inverter generator, it is related to power generation equipment field;System includes engine, ECO switch, inverter and permanent magnet generator, the output end of engine is exported to the permanent magnet rotor of the permanent magnet generator, for providing power for permanent magnet generator;Inverter is electrically connected to the stator winding of permanent magnet generator, its signal input end is connected to ECO switch, signal output end is connected to the throttle corresponding control unit of engine;ECO switch includes SUPER ECO gear, ECO gear, NORMAL gear and TURBO gear corresponding different engine speed, for setting unit operating gear, so that inverter generator outputs different power under different engine speed;Wherein, the engine speed corresponding output of SUPER ECO gear, ECO gear, NORMAL gear and TURBO gear of ECO switch increases in turn;By setting unit operating gear adaptation different load power requirement, it is more fuel-efficient when outputting small power.

Description

Technical Field

[0001] This utility model relates to the field of power generation equipment technology, specifically to an inverter generator fuel-saving control system and an inverter generator. Background Technology

[0002] Currently, small and medium-sized generator sets have a huge market demand due to their convenience, serving as backup power for households with power shortages and for outdoor camping. Most inverter generators on the market now come with an ECO function, which primarily adjusts the generator speed according to the load to reduce fuel consumption. However, the ECO function has a minimum idle speed, such as 2800 RPM. If the generator is only used to charge a mobile phone or connect a small refrigerator, it will still operate at 2800 RPM. Theoretically, the generator could further reduce its speed at this point to save fuel as much as possible. Utility Model Content

[0003] The purpose of this invention is to provide a fuel-saving control system and inverter generator for inverter generators, which are suitable for low-load applications and can maintain power output at extremely low speeds; by changing the generator's operating gear, fuel savings are maximized throughout the entire process.

[0004] To achieve the above objectives, the present invention proposes the following technical solution: Firstly, a fuel-saving control system for inverter generators is proposed, including an engine, an ECO switch, an inverter, and a permanent magnet generator. The output of the engine is sent to the permanent magnet rotor of the permanent magnet generator to provide power to the permanent magnet generator; The inverter is electrically connected to the stator winding of the permanent magnet generator, its signal input terminal is connected to the ECO switch, and its signal output terminal is connected to the control unit corresponding to the throttle of the engine. The ECO switch includes SUPER ECO, ECO, NORMAL, and TURBO settings corresponding to different engine speeds, used to set the unit's operating speed so that the inverter generator outputs different power at different engine speeds; wherein, the engine speeds corresponding to the SUPER ECO, ECO, NORMAL, and TURBO settings of the ECO switch increase sequentially.

[0005] Furthermore, the inverter includes two outputs with the same frequency and amplitude; the stator winding of the permanent magnet generator includes two independent and symmetrical three-phase output windings, which supply power to the two outputs of the inverter respectively. When the inverter generator is running in SUPER ECO mode, the two outputs of the inverter are in reverse phase. When the inverter is running in ECO, NORMAL, or TURBO mode, the two outputs of the inverter are in phase.

[0006] Furthermore, the inverter includes one output, and the stator winding of the permanent magnet generator is used to supply power to the one output of the inverter; the stator winding includes a detachable and replaceable first three-phase output winding and a second three-phase output winding, and the number of turns of the first three-phase output winding and the second three-phase output winding are different.

[0007] Furthermore, it also includes output relays; When the inverter is running in SUPER ECO mode, the two outputs of the inverter are in reverse phase, which drives the output relay to start so that the two outputs of the inverter are connected in series to the panel socket, so that the output power of the inverter is less than its rated power. When the inverter generator is running in ECO, NORMAL, or TURBO mode, the inverter disconnects the output relay and uses the normally-on mode of the output relay to output two outputs in parallel.

[0008] Furthermore, the inverter also includes a temperature detection unit, which is used to detect the engine oil temperature, ambient temperature, and power device temperature to calculate the output power margin of the inverter generator, thereby extending the high-power output time of the inverter generator in the TUOBO mode.

[0009] Furthermore, the engine speed output corresponding to the SUPER ECO mode does not exceed m1 rpm; the engine speed output corresponding to the ECO mode is a fixed minimum speed, which is greater than m1 rpm; the engine speed output corresponding to the NORMAL mode is a fixed maximum speed, which is greater than the fixed minimum speed; the engine speed output corresponding to the TURBO mode is a boosted speed based on the output power margin of the inverter generator, which is greater than the fixed maximum speed.

[0010] Furthermore, the inverter also includes a display unit for displaying the operating information of the inverter generator.

[0011] Furthermore, the ECO switch is an electrical signal switch, and the SUPER ECO, ECO, NORMAL, and TURBO modes of the ECO switch are output by different level or waveform signals.

[0012] Secondly, an inverter generator is proposed, wherein the inverter generator adopts the aforementioned inverter generator fuel-saving control system.

[0013] As can be seen from the above technical solutions, the technical solutions of this utility model have achieved the following beneficial effects: This utility model discloses a fuel-saving control system for an inverter generator and an inverter generator. The control system includes an engine, an ECO switch, an inverter, and a permanent magnet generator. The output of the engine is connected to the permanent magnet rotor of the permanent magnet generator to provide power to the generator. The inverter is electrically connected to the stator winding of the permanent magnet generator, with its signal input connected to the ECO switch and its signal output connected to the control unit corresponding to the engine's throttle. The ECO switch includes SUPER ECO, ECO, NORMAL, and TURBO modes that output different engine speeds, used to send the unit's operating mode to the inverter so that the inverter generator can output different power at different engine speeds. The engine speeds output by the SUPER ECO, ECO, NORMAL, and TURBO modes of the ECO switch increase sequentially. By setting the unit's operating mode to adapt to different load power requirements, fuel efficiency is improved when outputting low power.

[0014] The four operating modes disclosed in this utility model are as follows: SUPER ECO mode is when the generator operates at a very low speed to drive a small power load, and the specific speed can be calculated based on the current load; ECO mode is when the generator maintains operation at a low speed when unloaded, and then the speed gradually increases as the load increases, supporting full power output; NORMAL mode is when the generator operates at normal speed, and the inverter can output full power at any time; TURBO mode is when the generator briefly operates at a high speed, briefly outputting more power than rated. At this time, large inductive loads can be started or high-power equipment can be run briefly. At the same time, the generator will calculate the time when it can output high power based on the current heat dissipation, and simultaneously detect multiple data. If the warning value is exceeded, it will exit TURBO mode in time to protect the generator set from damage.

[0015] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0016] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0017] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a block diagram of the inverter generator structure of this utility model; Figure 2 This is a detailed connection diagram of each module of the inverter generator structure of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0019] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0020] As generator sets become increasingly common in residential homes, many generator sets operate under low load conditions. In such cases, further reducing engine speed and maintaining low load operation can significantly decrease fuel consumption. Therefore, this invention aims to provide a fuel-saving control system for generator sets with inverters, disclosing both the inverter generator and the fuel-saving inverter itself, thereby further reducing fuel consumption during low-power output.

[0021] The present invention discloses a fuel-saving control system for inverter generators and an inverter generator, which will be further described in detail below with reference to the specific embodiments shown in the accompanying drawings.

[0022] Combination Figure 1 As shown, a fuel-saving control system for an inverter generator includes an engine, an ECO switch, an inverter, and a permanent magnet generator. The engine outputs power to the permanent magnet rotor of the generator. The permanent magnet rotor is constructed of sheet-like neodymium iron boron magnets, suitable for operation in high-temperature environments. The inverter is electrically connected to the stator winding of the generator. Its signal input is connected to the ECO switch, and its signal output is connected to the throttle control unit of the engine, typically a stepper motor. The inverter outputs control signals to the stepper motor, which adjusts the throttle opening. The ECO switch includes SUPERECO, ECO, NORMAL, and TURBO modes corresponding to different engine speeds, used to set the generator's operating speed so that the inverter outputs different power at different engine speeds. The engine speeds corresponding to the SUPER ECO, ECO, NORMAL, and TURBO modes of the ECO switch increase sequentially.

[0023] During implementation, the inverter controls the engine throttle opening by detecting the ECO switch position, thereby controlling the unit speed. The SUPER ECO setting is used for low-power output conditions, minimizing unit speed based on load to maximize fuel economy. The ECO setting sets a minimum speed that allows for sudden increases in rated load without stalling; it operates at the minimum speed under no-load conditions and gradually increases speed as load increases to ensure fuel economy under normal use. The NORMAL setting keeps the unit running at high speed, allowing for sudden increases in rated load at any time to ensure output power and waveform quality. The TURBO setting is used for occasional short periods of high power output, where the unit operates at the maximum speed allowed by the engine and permanent magnet generator. When the unit's cooling system cannot support high power output, it exits this mode and enters NORMAL mode.

[0024] Combination Figure 2As shown in the embodiment, in order to further reduce the speed of the inverter generator when used with low-power loads, the inverter is configured to have two outputs with the same frequency and amplitude. When the inverter generator is running in SUPER ECO mode, the two outputs of the inverter are out of phase. When the inverter generator is running in ECO, NORMAL, or TURBO mode, the two outputs of the inverter are in phase. At the same time, to solve the problem of low three-phase winding output voltage of permanent magnet generator at low speed, the stator winding is adapted to the inverter by dividing it into two independent and symmetrical three-phase output windings, which supply power to the two outputs of the inverter respectively.

[0025] Furthermore, the inverter fuel-saving control system also includes an output relay. When the inverter is running in SUPERECO mode, the two outputs of the inverter are in reverse phase, driving the output relay to start so that the two outputs of the inverter are connected in series to the panel socket to obtain the rated output voltage, making the output power of the inverter less than its rated power. When the inverter is running in ECO, NORMAL, or TURBO mode, the inverter disconnects the output relay and uses the normally-on mode of the output relay to output the two outputs in parallel. At this time, the inverter can output the rated voltage on one side.

[0026] Optionally, to reduce the fuel consumption of the inverter generator in low-power load applications, such as a 200W load, the output voltage can be reduced directly, such as by controlling and adjusting the duty cycle of the inverter's output PWM waveform to make it suitable for use with adapters such as chargers that have a wider input voltage range.

[0027] In some embodiments, when the inverter generator operates in SUPER ECO mode, the output voltage is too low to meet the input voltage requirements of some low-power loads. In this case, the output voltage of the inverter generator operating in SUPER ECO mode can be increased by setting it as follows: The inverter includes one output, and the stator winding of the permanent magnet generator is used to power the one output of the inverter; the stator winding is configured to include a detachable and replaceable first three-phase output winding and a second three-phase output winding, and the number of turns of the first three-phase output winding and the second three-phase output winding are different; that is, in order to increase the output voltage of the motor in SUPER ECO mode, the number of turns of the winding can be appropriately increased, and a three-phase output winding with a higher number of turns can be replaced.

[0028] In addition, the inverter also includes a temperature detection unit, which is used to detect the engine oil temperature, ambient temperature, and power device temperature to calculate the output power margin of the inverter generator. This extends the high-power output time of the inverter generator in TURBO mode, ensuring that the unit is protected from damage when the inverter generator is running in TURBO mode. Furthermore, it allows for more precise control of the unit's operating time in TURBO mode, achieving dynamic adjustment of the generator output, which satisfies both the output power requirements and achieves fuel saving.

[0029] In addition, to facilitate the use of the inverter generator, the inverter also includes a display unit, which is used to display the operating information of the inverter generator, such as a display screen and indicator lights emitting prompts. Furthermore, to enrich the implementation of the various settings of the ECO switch, in addition to a rotary switch, the ECO switch can also be set as an electrical signal switch, with the SUPER ECO, ECO, NORMAL, and TURBO settings outputting different level or waveform signals.

[0030] In summary Figure 1 and Figure 2 The inverter generator disclosed in this utility model, when in SUPER ECO mode, is used for low-power loads. The engine operates at extremely low speeds, such as m1 RPM or even lower (m1 can be set to 2000). At this time, due to the low output voltage of the stator winding, the inverter cannot output the rated voltage. In this case, the inverter connects the two outputs in series through the output relay, so that the two waveforms with the same frequency and amplitude but opposite phase are superimposed into a sine wave with double voltage. At this time, the output power is affected by the power and can only output a small power, but it is sufficient for daily mobile phone charging or refrigerator use. Since the engine is at extremely low speed, fuel consumption is also reduced linearly.

[0031] When in ECO mode, the corresponding engine speed is a fixed minimum speed, typically greater than m1 RPM, such as 2800 RPM. The inverter can automatically adjust the speed according to the load. The inverter's two outputs are parallel, capable of outputting rated power. When in NORMAL mode, the corresponding engine speed is a fixed maximum speed, greater than the fixed minimum speed, such as 3600 RPM. In this mode, the unit can output full power at any time, adapting to sudden load changes. When in TURBO mode, the inverter adjusts the output speed based on ambient temperature, the temperature of the internal power devices, and the engine speed. The generator set calculates its current output power margin based on data such as engine oil temperature, and then increases its speed to a level greater than the fixed maximum speed, for example, m2 revolutions per minute (m2 can be set to 5000 or other values). At this time, the generator can output 1.5 times or even more of its rated power to start large inductive loads or maintain high power output for a period of time. When the inverter detects that the engine oil temperature t1 rises to the warning value, for example, t1 reaches 130°C, or the temperature t2 of the power devices inside the inverter rises to the warning value, for example, t2 reaches 110°C, the generator set automatically reduces its speed and output power to avoid damage to the generator set.

[0032] Applying the fuel-saving control system of this invention to an inverter generator effectively reduces fuel consumption compared to existing technologies, especially under low-power loads. The same principle applies to electronic fuel injection (EFI) engines, resulting in even better performance. This is because EFI engines can operate stably at lower speeds and are inherently more fuel-efficient than traditional carburetor engines. Combining these two factors allows the generator set to achieve fuel savings across the entire load range.

[0033] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A fuel-saving control system for an inverter generator, characterized in that, Includes the engine, ECO switch, inverter, and permanent magnet generator; The output of the engine is sent to the permanent magnet rotor of the permanent magnet generator to provide power to the permanent magnet generator; The inverter is electrically connected to the stator winding of the permanent magnet generator, its signal input terminal is connected to the ECO switch, and its signal output terminal is connected to the control unit corresponding to the throttle of the engine. The ECO switch includes SUPER ECO, ECO, NORMAL, and TURBO settings corresponding to different engine speeds, used to set the unit's operating speed so that the inverter generator outputs different power at different engine speeds; wherein, the engine speeds corresponding to the SUPER ECO, ECO, NORMAL, and TURBO settings of the ECO switch increase sequentially.

2. The inverter generator fuel-saving control system according to claim 1, characterized in that, The inverter includes two outputs with the same frequency and amplitude; the stator winding of the permanent magnet generator includes two independent and symmetrical three-phase output windings, which supply power to the two outputs of the inverter respectively. When the inverter generator is running in SUPER ECO mode, the two outputs of the inverter are in reverse phase. When the inverter is running in ECO, NORMAL, or TURBO mode, the two outputs of the inverter are in phase.

3. The inverter generator fuel-saving control system according to claim 1, characterized in that, The inverter includes one output, and the stator winding of the permanent magnet generator is used to power the one output of the inverter; the stator winding includes a detachable and replaceable first three-phase output winding and a second three-phase output winding, and the number of turns of the first three-phase output winding and the second three-phase output winding are different.

4. The inverter generator fuel-saving control system according to claim 2, characterized in that, It also includes output relays; When the inverter is running in SUPER ECO mode, the two outputs of the inverter are in reverse phase, which drives the output relay to start so that the two outputs of the inverter are connected in series to the panel socket, so that the output power of the inverter is less than its rated power. When the inverter generator is running in ECO, NORMAL, or TURBO mode, the inverter disconnects the output relay and uses the normally-on mode of the output relay to output two outputs in parallel.

5. The inverter generator fuel-saving control system according to claim 2 or 3, characterized in that, The inverter also includes a temperature detection unit, which is used to detect the engine oil temperature, ambient temperature and power device temperature to calculate the output power margin of the inverter generator, thereby extending the high-power output time of the inverter generator in the TUOBO mode.

6. The inverter generator fuel-saving control system according to claim 5, characterized in that, The SUPER ECO mode corresponds to an engine speed of no more than m1 revolutions. The engine speed output corresponding to the ECO mode is a fixed minimum speed, which is greater than m1 revolutions. The NORMAL mode outputs a fixed maximum engine speed, which is greater than a fixed minimum speed; the TURBO mode outputs a boosted engine speed based on the output power margin of the inverter generator, which is greater than the fixed maximum speed.

7. The inverter generator fuel-saving control system according to claim 2 or 3, characterized in that, The inverter also includes a display unit for displaying the operating information of the inverter generator.

8. The inverter generator fuel-saving control system according to claim 1, characterized in that, The ECO switch is an electrical signal switch, and the SUPER ECO, ECO, NORMAL and TURBO modes of the ECO switch are output by different level or waveform signals.

9. An inverter generator, characterized in that, The inverter generator adopts the fuel-saving control system of the inverter generator as described in any one of claims 1-8.

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