A new power extension system and method for extended-range electric vehicles

Abstract

The application discloses a novel power increasing system and method for a range-extending electric vehicle. The method comprises the following steps: inputting hydrogen-oxygen mixed gas into annular cylinders, completing the circulation of air intake and compression, work and exhaust, driving the generator set to charge the battery group of the electric vehicle while the synchronous shaft of the annular cylinder rotates, and realizing the range extension and endurance of the battery group; the annular cylinders are grouped in pairs, the first annular cylinder completes the circulation of air intake and compression, and the second annular cylinder completes the circulation of work and exhaust; the high-pressure gas formed by air intake and compression in the first annular cylinder is input into a combustion chamber and ignited by a spark plug, the high-temperature and high-pressure gas generated is input into the second annular cylinder, and exhaust is performed after work. The application can improve the environmental protection performance, the power output structure is simple, and the energy conversion efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy electric vehicle technology, and specifically to a novel power range-extending system and range-extending method for range-extended electric vehicles. Background Technology

[0002] With the rapid depletion of non-renewable resources such as oil and environmental damage, new energy vehicles, especially pure electric vehicles, have become market darlings in recent years. However, the current driving range of pure electric vehicles cannot fully meet consumer demand, and range anxiety and charging anxiety have become bottlenecks. Range-extended electric vehicles, which combine the advantages of both gasoline and electric vehicles, are expected to be a market hotspot in the coming years, with their core technology being the power range extension system.

[0003] In existing technological solutions, most range-extended electric vehicles use fuel-powered range extenders. These extenders use an internal combustion engine to burn gasoline, converting the released heat energy into mechanical energy to increase vehicle power. However, gasoline mainly consists of C5-C12 aliphatic hydrocarbons and cycloalkanes, as well as a certain amount of aromatic hydrocarbons. After complete combustion, it mainly produces carbon dioxide and water. Incomplete combustion produces carbon and carbon monoxide. Excessive carbon dioxide emissions are a major cause of the greenhouse effect, global warming, glacial melting, and rising sea levels. Moreover, carbon monoxide is a toxic gas. Therefore, this range-extending method reduces the environmental performance of electric vehicles. Furthermore, the power output structure of an internal combustion engine is usually a crank-connecting rod mechanism, which is complex and has low energy conversion efficiency.

[0004] To address the above technical problems, this invention proposes a novel power range-extending system and range-extending method for range-extended electric vehicles. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and propose a novel power range-extending system and range-extending method for range-extended electric vehicles, which can improve environmental performance, and has a simple power output structure and improve energy conversion efficiency.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A novel power range extender system for range-extended electric vehicles includes a power unit, a generator set, and a range extender controller; the power unit is connected to the generator set via a coupling to supplement the generator set with power, and the generator set includes a generator and a generator controller;

[0008] The power unit includes one or more annular cylinders, each group including a first annular cylinder and a second annular cylinder. The first annular cylinder cycles through the intake and compression strokes, and the second annular cylinder cycles through the power and exhaust strokes.

[0009] The first annular cylinder has an external high-pressure air pipe, and the first annular cylinder is provided with a high-pressure gas output port connected to the high-pressure air pipe;

[0010] The second annular cylinder has an external combustion chamber, and the second annular cylinder is provided with an air inlet connected to the combustion chamber. The combustion chamber is connected to a high-pressure gas pipe.

[0011] The first annular cylinder is provided with an air inlet valve port, which is connected to an air inlet pipe for a hydrogen-oxygen mixture; the air inlet pipe is provided with an air inlet regulating system, and the air inlet regulating system is provided with an electrically controlled valve;

[0012] The high-pressure gas pipe is equipped with a first solenoid valve and a second solenoid valve at its two ends. One end of the high-pressure gas pipe is connected to the high-pressure gas output port of the first annular cylinder, and the other end of the high-pressure gas pipe is connected to the combustion chamber. The first solenoid valve regulates the amount of high-pressure gas entering the high-pressure gas pipe, and the second solenoid valve regulates the amount of high-pressure gas entering the combustion chamber.

[0013] The range extender controller includes a first sensor, a second sensor, and a control chip;

[0014] The first sensor is placed inside the intake pipe of the combustion chamber to monitor the gas concentration entering the combustion chamber through the high-pressure gas pipe, i.e., the mixing ratio of hydrogen and oxygen mixture. The second sensor is placed at the exhaust port of the combustion chamber to monitor the temperature inside the combustion chamber.

[0015] The control chip is connected to the first sensor and to the electronically controlled valve of the intake regulating system, thereby controlling the hydrogen concentration to above 76% to prevent the mixed gas from accidentally exploding before entering the combustion chamber. This is because when the hydrogen concentration is less than 4.0% or greater than 75%, it will not explode even if it encounters a source of ignition.

[0016] The control chip is connected to the generator controller of the generator set and to the battery power reading meter of the vehicle battery. Therefore, the control chip can monitor the battery power consumption rate in real time, and then decide whether to charge and which charging mode to use based on the battery power consumption rate. It sends corresponding instructions to the generator controller. The charging modes include intermittent charging and continuous charging.

[0017] The control chip is connected to both the first and second solenoid valves to regulate the supply of hydrogen-oxygen mixture into the combustion chamber. It is also connected to a second sensor to monitor the temperature inside the combustion chamber and transmit this temperature value to the control chip. The control chip then sends commands to the first and second solenoid valves or the electronically controlled valves of the intake regulating system to adjust the supply or concentration of the hydrogen-oxygen mixture, thereby controlling the temperature inside the combustion chamber within the range of 800-1200°C. This is because at temperatures above 1200°C, nitrogen and oxygen in the air undergo a chemical reaction to produce nitrogen oxides. Since the product of hydrogen combustion is only water, which cannot reduce nitrogen oxides, and nitrogen oxides are pollutants that pollute the environment, the temperature inside the combustion chamber must be controlled below 1200°C to avoid their formation. However, below 800°C, power output is insufficient, so the temperature inside the combustion chamber needs to be controlled between 800°C and 1200°C.

[0018] Preferably, the combustion chamber ignites the high-pressure gas entering the combustion chamber using a spark plug.

[0019] Preferably, the first annular cylinder is connected to a starter motor, which drives the rotor slide to rotate initially. After the rotor slide rotates due to external force, the starter motor stops operating. The starter motor is powered by a battery pack.

[0020] Preferably, the annular cylinder includes a fixed outer ring and a rotor inner ring, wherein the fixed outer ring is fixed and stationary, and the rotor inner ring is disposed inside the fixed outer ring and can rotate around the center;

[0021] The fixed outer ring is provided with a limiting slide plug, which is placed inside the fixed outer ring and extends inward. The limiting slide plug is placed on the fixed outer ring through a reciprocating linear motion mechanism and a return spring. The reciprocating linear motion mechanism is sealed to the fixed outer ring to ensure the sealing of the inside of the annular cylinder.

[0022] The inner ring of the rotor is provided with a rotor slide plug, which rotates synchronously with the inner ring of the rotor; the rotor slide plug is located outside the inner ring of the rotor and extends outward, contacting the inner side of the fixed outer ring;

[0023] The rotation frequency of the reciprocating linear motion mechanism is matched with the rotation frequency of the rotor slide, so that when the rotor slide rotates to the side of the limiting slide, the limiting slide moves radially outward. After the rotor slide passes, the limiting slide moves radially inward to reset, and is accurately reset under the action of the reset spring.

[0024] Preferably, the air inlet of the first annular cylinder is located on one side of the limiting slide, and the high-pressure gas outlet of the first annular cylinder is located on the other side of the limiting slide.

[0025] Preferably, a closed annular space is formed between the limiting slide and the rotor slide of the first annular cylinder, which is the cylinder volume of the first annular cylinder, and the annular stroke is formed by the circumference of the annular line of 300±30°.

[0026] Preferably, the reciprocating linear motion mechanism is any one of a crank-slider mechanism, an eccentric wheel mechanism, a Geneva wheel mechanism, a cam mechanism, a hydraulic cylinder mechanism, and a pneumatic cylinder mechanism.

[0027] The cam mechanism includes a cam structure and a rotary motor. The rotary motor is set to a rotation frequency to control the rotation of the cam, so as to achieve cooperation with the rotor slide.

[0028] Preferably, the hydrogen-oxygen mixture is ignited in the combustion chamber using a spark plug.

[0029] Preferably, the interior of the second annular cylinder is divided into two regions by a limiting slide and a rotor slide, which are the power region and the exhaust region, respectively; the exhaust valve port of the second annular cylinder is located on the limiting slide side.

[0030] A novel power range extension method for range-extended electric vehicles, characterized in that:

[0031] ① The hydrogen-oxygen mixture is input into the annular cylinder, which cycles through intake and compression, power and exhaust. The synchronous shaft of the annular cylinder rotates while driving the generator set to charge the battery pack of the electric vehicle, thereby extending the range of the battery pack.

[0032] ② The range extender controller determines whether to activate the charging mode based on the battery pack's power consumption rate.

[0033] Preferably, the annular cylinders are arranged in pairs, with the first annular cylinder cyclically completing the intake and compression, and the second annular cylinder cyclically completing the power and exhaust.

[0034] Preferably, the high-pressure gas formed by the intake and compression of air in the first annular cylinder is input into the combustion chamber and ignited by the spark plug. The resulting high-temperature and high-pressure gas is input into the second annular cylinder, and after doing work, it is exhausted.

[0035] Preferably, the range extender controller regulates the mixing ratio of hydrogen-oxygen mixture and the supply of hydrogen-oxygen mixture into the combustion chamber to achieve constant power continuous operation, which can improve fuel utilization and enable the range extender system to charge the battery pack at a relatively stable voltage, thus helping to extend the battery pack's service life.

[0036] Preferably, the range extender controller controls the hydrogen concentration at 76% or higher to prevent accidental explosion of the gas mixture before it enters the combustion chamber, and controls the temperature inside the combustion chamber at 800~1200℃ to prevent the generation of nitrogen oxides, and also to ensure stable power output.

[0037] Preferably, the range extender controller continuously adjusts the supply of hydrogen-oxygen mixture gas according to the power output curve of the power unit to ensure that the system continuously operates near the rated point; the power output curve of the power unit can reflect the changes in torque and speed, where the point with the maximum torque is the rated point, and the output power at the rated point is close to constant, which is the optimal operating condition point; the range extender controller adjusts the supply of hydrogen-oxygen mixture gas and the intake valve port to ensure that the range extender system continuously operates near the rated point, achieving constant power operation.

[0038] Specifically, the rotor slide in the first annular cylinder is driven to rotate by the starter motor, which increases the space between the limiting slide and the first rotor slide of the first annular cylinder, creating a negative pressure. This allows the hydrogen-oxygen mixture to enter the annular space from the intake valve of the first annular cylinder. The starter motor then stops, and the hydrogen-oxygen mixture pushes the first rotor slide to continue rotating. When the rotor slides to the vicinity of the first limiting slide, the intake valve closes, and the intake stroke is completed.

[0039] After the intake stroke is completed, the first limiting slide block moves radially outward under the rotation of the reciprocating linear motion mechanism of the first annular cylinder, that is, the first reciprocating linear motion structure, so that the first rotor slide block passes through. Then, the first limiting slide block moves radially inward to reset under the rotation of the first reciprocating linear motion structure.

[0040] At this point, the compression process begins, and the first rotor slide continues to rotate. The volume of the annular cylinder decreases, and the hydrogen-oxygen mixture is gradually compressed. When the first rotor slide rotates to the vicinity of the first limiting slide again, the first solenoid valve opens, allowing the high-pressure hydrogen-oxygen mixture to enter the high-pressure gas pipe. Then, the second solenoid valve is also opened, and the high-pressure hydrogen-oxygen mixture enters the combustion chamber. Thus, the compression stroke is completed, and the first annular cylinder enters the next intake stroke. At this point, the second solenoid valve closes.

[0041] After the compression stroke is completed, the high-pressure hydrogen-oxygen mixture in the combustion chamber is ignited by the spark plug. After detonation, it becomes a high-temperature and high-pressure gas. The exhaust port of the combustion chamber opens, and the high-temperature and high-pressure gas from the detonation enters the power region of the second annular cylinder. Then, it pushes the rotor slide of the second annular cylinder, i.e., the second rotor slide, to rotate until the second rotor slide rotates to one side of the second limiting slide, and the power stroke is completed. After the power stroke is completed, the exhaust valve opens, and the exhaust gas after combustion is forcibly discharged.

[0042] Then, the second limiting slide block moves radially outward under the drive of the second reciprocating linear motion structure of the second annular cylinder, so that the second rotor slide block of the second annular cylinder passes through; then the second limiting slide block is reset, thus ending one cycle and starting the next cycle.

[0043] During the repeated rotation of each set of annular cylinders, the synchronous shaft of the annular cylinders is connected to the generator. Therefore, the power unit, including the annular cylinders, can drive the generator to generate electricity. The generator then charges the battery pack of the electric vehicle, thereby extending the range of the battery pack.

[0044] Throughout the process, the first sensor monitors the gas density entering the combustion chamber through the high-pressure gas pipe in real time, and the second sensor monitors the temperature inside the combustion chamber in real time. The monitored gas concentration and combustion chamber temperature are then transmitted to the control chip. The control chip makes judgments and decisions based on a pre-designed program. If adjustment is required, it sends instructions to the electronically controlled valve of the intake regulating system to adjust the hydrogen concentration of the hydrogen-oxygen mixture, or sends instructions to the first and second solenoid valves to adjust the supply of the hydrogen-oxygen mixture into the combustion chamber, thereby adjusting the temperature inside the combustion chamber.

[0045] Specifically, if the gas concentration detected by the first sensor, after being converted into a volume density, is greater than 76%, no adjustment is made; if the volume density is less than 76%, the control chip sends a command to the electronically controlled valve of the intake regulating system to adjust the hydrogen concentration in the hydrogen-oxygen mixture and increase the supply of hydrogen fuel until the volume density of the hydrogen fuel is greater than 76%.

[0046] If the combustion chamber temperature detected by the second sensor is within 800℃-1200℃, no adjustment is made, and monitoring continues. If the combustion chamber temperature is below 800℃, the control chip sends a command to the first and second solenoid valves to increase the supply of hydrogen-oxygen mixture and raise the combustion chamber temperature to ensure a continuous and stable power output. If the combustion chamber temperature is above 1200℃, the control chip sends a command to the first and second solenoid valves to reduce the supply of hydrogen-oxygen mixture, thereby lowering the combustion chamber temperature to prevent the formation of nitrogen oxides.

[0047] The range extender system charging mode control in this patent is performed as follows: when the charging speed is greater than the battery power consumption rate, the vehicle is driving normally;

[0048] When the battery's State of Charge (SOC) exceeds its upper limit, the power unit and generator set shut down, and the battery stops charging. When the battery's SOC is between its upper and lower limits, the power unit and generator set intermittently supply power to charge the battery. When the battery's SOC falls below its lower limit, the power unit and generator set start up, continuously supplying power to the battery. When the charging rate is equal to or less than the rate of battery depletion, the power unit and generator set continue to operate, charging the battery to ensure it has power.

[0049] SOC, or State of Charge, also known as remaining capacity, represents the ratio of the remaining capacity of a battery after a period of use or long-term disuse to its capacity when fully charged. When SOC=0, it means the battery is fully discharged, and when SOC=1, it means the battery is fully charged.

[0050] The beneficial effects of this invention are as follows:

[0051] This invention uses a power unit based on an annular cylinder to provide power to a generator set through the circular motion of a rotor slide block, thereby enabling the charging and range extension of the electric vehicle's battery pack. The power unit has few components and only circular motion, making the power output more convenient and direct, and greatly improving the energy conversion efficiency of fuel.

[0052] In this invention, the power unit uses hydrogen as fuel. Hydrogen is a clean and renewable energy source, and its only byproduct is water, resulting in zero pollution. Moreover, compared with the same mass of gasoline, the calorific value of hydrogen is several times that of gasoline, and the flame propagation speed of hydrogen is fast, which can make the fuel burn more completely, thus achieving the purpose of energy conservation and emission reduction.

[0053] In this invention, the mixing ratio of hydrogen-oxygen mixture and the supply of hydrogen-oxygen mixture into the combustion chamber are regulated by the range extender controller to enable the power unit to operate at a constant power close to the rated operating point. This improves fuel efficiency and allows the range extender system to charge the battery pack at a relatively stable voltage, which helps to extend the battery pack's service life.

[0054] By adopting the above solution, the present invention can provide range extension charging for electric vehicles in a more convenient and direct manner, with a simple power output structure; it also has high fuel energy conversion efficiency, reducing unnecessary waste; it is pollution-free, has high fuel utilization, and can charge the battery pack with a relatively stable voltage, which is beneficial to extending the battery pack's service life. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0057] Figure 2 This is a schematic diagram of the structure of the first annular cylinder of the present invention.

[0058] Figure 3 This is a schematic diagram of the structure of the second annular cylinder of the present invention.

[0059] In the diagram, 1-first annular cylinder, 2-second annular cylinder, 3-third annular cylinder, 4-fourth annular cylinder, 5-coupling, 6-generator set, 7-range extender controller;

[0060] 11-First fixed outer ring, 12-First rotor inner ring, 13-Annular space, 14-First rotor slide plug, 15-Inlet valve port, 16-First limiting slide plug, 17-First solenoid valve, 18-High-pressure air pipe, 19-Second solenoid valve;

[0061] 21-First fixed outer ring, 22-Second rotor inner ring, 23-Exhaust area, 24-Third annular cylinder, 25-Exhaust valve port, 26-Second limiting slide, 27-Second rotor slide, 28-Power area, 29-Combustion chamber. Detailed Implementation

[0062] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0063] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0064] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] like Figures 1-3 As shown, a novel power range extender system for range-extended electric vehicles includes a power unit, a generator set 6, and a range extender controller 7.

[0067] The power unit includes one or more annular cylinders, each group including a first annular cylinder 1 and a second annular cylinder 2. The first annular cylinder 1 completes the intake and compression strokes in a cycle, and the second annular cylinder 2 completes the power and exhaust strokes in a cycle.

[0068] The first annular cylinder 1 has an external high-pressure air pipe 18, which is connected to the high-pressure gas output port of the first annular cylinder 1.

[0069] The second annular cylinder 2 has an external combustion chamber 29, which is connected to the air inlet of the second annular cylinder 2 and is connected to the high-pressure air pipe 18.

[0070] The high-pressure gas pipe 18 is equipped with a first solenoid valve 17 and a second solenoid valve 19 at its two ends. One end of the high-pressure gas pipe 18 is connected to the high-pressure gas output port of the first annular cylinder 1, and the other end of the high-pressure gas pipe 18 is connected to the combustion chamber 29. The first solenoid valve 17 regulates the amount of high-pressure gas entering the high-pressure gas pipe 18. The second solenoid valve 19 regulates the amount of high-pressure gas entering the combustion chamber 29.

[0071] The first annular cylinder 1 is provided with an air inlet valve 15, which is connected to an air inlet pipe for a hydrogen-oxygen mixture; the air inlet pipe is provided with an air inlet regulating system, and the air inlet regulating system is provided with an electrically controlled valve;

[0072] The power unit is connected to the generator set 6 via a coupling 5 to supplement the power of the generator set 6. The generator set 6 includes a generator and a generator controller.

[0073] The range extender controller 7 includes a first sensor, a second sensor, and a control chip;

[0074] The first sensor is placed inside the intake pipe of the combustion chamber 29 to monitor the gas concentration entering the combustion chamber 29 from the high-pressure gas pipe 18, i.e., the mixing ratio of hydrogen and oxygen mixture. The second sensor is placed at the exhaust port of the combustion chamber 29 to monitor the temperature inside the combustion chamber 29.

[0075] The control chip is connected to the first sensor and to the electronically controlled valve of the intake regulating system, thereby controlling the hydrogen concentration to above 76% to prevent the mixed gas from accidentally exploding before entering the combustion chamber 29. This is because when the hydrogen concentration is less than 4.0% or greater than 75%, it will not explode even if it encounters a source of ignition.

[0076] The control chip is connected to the generator controller of the generator set and to the battery power reading meter of the vehicle battery. Therefore, the control chip can monitor the battery power consumption rate in real time, and then decide whether to charge and which charging mode to use based on the battery power consumption rate. It sends corresponding instructions to the generator controller. The charging modes include intermittent charging and continuous charging.

[0077] The control chip is connected to both the first solenoid valve 17 and the second solenoid valve 18 to regulate the supply of hydrogen-oxygen mixture into the combustion chamber 29. The control chip is also connected to a second sensor to monitor the temperature inside the combustion chamber and transmit the temperature value to the control chip. The control chip sends commands to the first solenoid valve 17, the second solenoid valve 18, or the electronically controlled valve of the intake regulating system to adjust the supply or concentration of the hydrogen-oxygen mixture, thereby controlling the temperature inside the combustion chamber 29 between 800 and 1200°C. This is because at temperatures above 1200°C, nitrogen and oxygen in the air undergo a chemical reaction to generate nitrogen oxides. Since the product of hydrogen combustion is only water, which cannot reduce nitrogen oxides, and nitrogen oxides are pollutants that pollute the environment, the temperature inside the combustion chamber 29 needs to be controlled below 1200°C to avoid their formation. However, below 800°C, power output is insufficient, so the temperature inside the combustion chamber 29 needs to be controlled between 800°C and 1200°C.

[0078] Preferably, the combustion chamber 29 ignites the high-pressure gas entering the combustion chamber 29 using a spark plug.

[0079] Preferably, the first annular cylinder 1 is connected to a starter motor, which drives the rotor slide to rotate initially. After the rotor slide rotates due to external force, the starter motor stops operating. The starter motor is powered by a battery pack.

[0080] Preferably, the annular cylinder includes a fixed outer ring and a rotor inner ring, wherein the fixed outer ring is fixed and stationary, and the rotor inner ring is disposed inside the fixed outer ring and can rotate around the center;

[0081] The fixed outer ring is provided with a limiting slide plug, which is placed inside the fixed outer ring and extends inward. The limiting slide plug is placed on the fixed outer ring through a reciprocating linear motion mechanism and a return spring. The reciprocating linear motion mechanism is sealed to the fixed outer ring to ensure the sealing of the inside of the annular cylinder.

[0082] The inner ring of the rotor is provided with a rotor slide plug, which rotates synchronously with the inner ring of the rotor; the rotor slide plug is located outside the inner ring of the rotor and extends outward, contacting the inner side of the fixed outer ring;

[0083] The rotation frequency of the reciprocating linear motion mechanism is matched with the rotation frequency of the rotor slide, so that when the rotor slide rotates to the side of the limiting slide, the limiting slide moves radially outward. After the rotor slide passes, the limiting slide moves radially inward to reset, and is accurately reset under the action of the reset spring.

[0084] Preferably, the air inlet 15 of the first annular cylinder 1 is located on one side of the first limiting slide 16, and the high-pressure gas outlet of the first annular cylinder 1 is located on the other side of the first limiting slide 16.

[0085] Preferably, a closed annular space is formed between the first limiting slide 16 and the first rotor slide 14 of the first annular cylinder 1, which is the cylinder volume of the first annular cylinder 1, and the annular stroke is formed by the annular circumference of 300±30°.

[0086] Preferably, the reciprocating linear motion mechanism is any one of a crank-slider mechanism, an eccentric wheel mechanism, a Geneva wheel mechanism, a cam mechanism, a hydraulic cylinder mechanism, and a pneumatic cylinder mechanism.

[0087] The cam mechanism includes a cam structure and a rotary motor. The rotary motor is set to a rotation frequency to control the rotation of the cam, so as to achieve cooperation with the rotor slide.

[0088] Preferably, the combustion chamber 29 uses a spark plug to ignite the hydrogen-oxygen mixture.

[0089] Preferably, the interior of the second annular cylinder 2 is divided into two regions by the second limiting slide 26 and the second rotor slide 27, which are the power region and the exhaust region, respectively; the exhaust valve port 25 of the second annular cylinder 2 is located on one side of the second limiting slide 26.

[0090] A novel power range extension method for range-extended electric vehicles, characterized in that:

[0091] ③ The hydrogen-oxygen mixture is input into the annular cylinder, which cycles through intake and compression, power and exhaust. The synchronous shaft of the annular cylinder rotates while driving the generator set to charge the battery pack of the electric vehicle, thereby extending the range of the battery pack.

[0092] ④ The range extender controller 7 determines whether to activate the charging mode based on the battery pack's power consumption rate.

[0093] Preferably, the annular cylinders are arranged in pairs, with the first annular cylinder 1 cycling through intake and compression, and the second annular cylinder 2 cycling through work and exhaust.

[0094] Preferably, the high-pressure gas formed by the intake and compression of air in the first annular cylinder 1 is input into the combustion chamber 29 and ignited by the spark plug. The resulting high-temperature and high-pressure gas is input into the second annular cylinder 2, and exhausts after power is performed.

[0095] Preferably, the range extender controller 7 continuously adjusts the supply of hydrogen-oxygen mixture gas according to the power output curve of the power unit to ensure that the system continuously operates near the rated point. The power output curve of the power unit can reflect the changes in torque and speed, with the point of maximum torque being the rated point. At the rated point, the output power is close to constant, which is the optimal operating condition. By adjusting the supply of hydrogen-oxygen mixture gas and the intake valve, the range extender controller 7 enables the range extender system to continuously operate near the rated point, achieving constant power operation. This not only improves fuel utilization but also allows the range extender system to charge the battery pack at a relatively stable voltage, which is beneficial to extending the battery pack's service life.

[0096] Preferably, the range extender controller 7 controls the hydrogen concentration to above 76% to prevent accidental explosion of the mixed gas before it enters the combustion chamber 29, and controls the temperature inside the combustion chamber 29 to within 800~1200℃ to prevent the generation of nitrogen oxides.

[0097] Specifically, the first rotor slide 14 in the first annular cylinder 1 is driven to rotate by the starter motor, which increases the space between the first limiting slide 16 and the first rotor slide 14 of the first annular cylinder 1, creating a negative pressure. This allows the hydrogen-oxygen mixture to enter the annular space 13 from the intake valve port 15 of the first annular cylinder 1. The starter motor then stops. At this time, the hydrogen-oxygen mixture pushes the first rotor slide 14 to continue rotating. When it rotates to the vicinity of the first limiting slide 16, the intake valve port 15 closes, and the intake stroke is completed.

[0098] After the intake stroke ends, the first limiting slide 16 moves radially outward under the rotation of the first reciprocating linear motion structure of the first annular cylinder 1, so that the first rotor slide 14 passes through, and then the first limiting slide 16 moves radially inward to reset under the rotation of the first reciprocating linear motion structure.

[0099] At this point, the compression process begins, and the first rotor slide 14 continues to rotate. The volume of the annular cylinder decreases, and the hydrogen-oxygen mixture is gradually compressed. When the first rotor slide 14 rotates to the vicinity of the first limiting slide 16, the first solenoid valve 17 is opened, allowing the high-pressure hydrogen-oxygen mixture to enter the high-pressure gas pipe 18. Then, the second solenoid valve 19 is also opened, and the high-pressure hydrogen-oxygen mixture enters the combustion chamber 29. Thus, the compression stroke is completed, and the first annular cylinder 1 enters the next intake stroke. At this point, the second solenoid valve 19 is closed.

[0100] After the compression stroke is completed, the high-pressure hydrogen-oxygen mixture in the combustion chamber 29 is ignited by the spark plug. After detonation, it becomes a high-temperature and high-pressure gas. The exhaust port of the combustion chamber 29 opens, and the high-temperature and high-pressure gas from the detonation enters the power region of the second annular cylinder 2. Then, it pushes the second rotor slide 27 of the second annular cylinder 2 to rotate until the second rotor slide 27 rotates to one side of the second limiting slide 26, and the power stroke is completed. After the power stroke is completed, the exhaust valve port 25 opens, and the exhaust gas after combustion is forcibly discharged.

[0101] Then, the second limiting slide 26 moves radially outward under the drive of the second reciprocating linear motion structure of the second annular cylinder 2, so that the second rotor slide 27 passes through; then the second limiting slide 26 is reset, thus ending one cycle and starting the next cycle.

[0102] During the repeated rotation of each set of annular cylinders, the synchronous shaft of the annular cylinders is connected to the generator. Therefore, the power unit, including the annular cylinders, can drive the generator to generate electricity. The generator then charges the battery pack of the electric vehicle, thereby extending the range of the battery pack.

[0103] Throughout the process, the first sensor monitors the gas density entering the combustion chamber 29 from the high-pressure gas pipe 18 in real time, and the second sensor monitors the temperature inside the combustion chamber 29 in real time, transmitting the monitored gas concentration and the temperature of the combustion chamber 29 to the control chip. The control chip makes judgments and decisions based on the pre-designed program. If adjustment is required, it sends instructions to the electronically controlled valve of the intake regulating system to adjust the hydrogen concentration of the hydrogen-oxygen mixture, or sends instructions to the first solenoid valve 17 and the second solenoid valve 19 to adjust the supply of the hydrogen-oxygen mixture into the combustion chamber 29, thereby adjusting the temperature inside the combustion chamber 29.

[0104] Specifically, if the gas concentration detected by the first sensor, after being converted into a volume density, is greater than 76%, no adjustment is made; if the volume density is less than 76%, the control chip sends a command to the electronically controlled valve of the intake regulating system to adjust the hydrogen concentration in the hydrogen-oxygen mixture and increase the supply of hydrogen fuel until the volume density of the hydrogen fuel is greater than 76%.

[0105] If the temperature inside the combustion chamber 29 detected by the second sensor is within 800℃-1200℃, no adjustment is made, and monitoring continues. If the temperature inside the combustion chamber 29 is below 800℃, the control chip sends a command to the first solenoid valve 17 and the second solenoid valve 19 to increase the supply of hydrogen-oxygen mixture and raise the temperature inside the combustion chamber 29 to ensure a continuous and stable power output. If the temperature inside the combustion chamber 29 is above 1200℃, the control chip sends a command to the first solenoid valve 17 and the second solenoid valve 19 to reduce the supply of hydrogen-oxygen mixture, thereby lowering the temperature inside the combustion chamber 29 to prevent the formation of nitrogen oxides.

[0106] The range extender system charging mode control in this patent is performed as follows: when the charging speed is greater than the battery power consumption rate, during normal vehicle operation;

[0107] When the battery's State of Charge (SOC) exceeds its upper limit, the power unit and generator set 6 shut down, and battery charging stops. When the battery's SOC is between its upper and lower limits, the power unit and generator set 6 intermittently supply power to charge the battery. When the battery's SOC falls below its lower limit, the power unit and generator set 6 starts up, continuously supplying power to the battery. When the charging rate is equal to or less than the rate of battery depletion, the power unit and generator set 6 continuously operate to charge the battery, ensuring it has power.

[0108] SOC, or State of Charge, also known as remaining capacity, represents the ratio of the remaining capacity of a battery after a period of use or long-term disuse to its capacity when fully charged. When SOC=0, it means the battery is fully discharged, and when SOC=1, it means the battery is fully charged.

[0109] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power range extender system for range-extended electric vehicles, characterized in that: It includes a power unit, a generator set, and a range extender controller; the power unit is connected to the generator set via a coupling, and the generator set includes a generator and a generator controller. The power unit includes one or more annular cylinders, each group including a first annular cylinder and a second annular cylinder. The first annular cylinder cycles through the intake and compression strokes, and the second annular cylinder cycles through the power and exhaust strokes. The annular cylinder includes a fixed outer ring and a rotor inner ring. The fixed outer ring is stationary, and the rotor inner ring is located inside the fixed outer ring and can rotate around the center. A limiting slide is provided on the fixed outer ring. The limiting slide is located inside the fixed outer ring and extends inward. The limiting slide is positioned on the fixed outer ring via a reciprocating linear motion mechanism and a return spring. The reciprocating linear motion mechanism is sealed to the fixed outer ring. A rotor slide is provided on the rotor inner ring. The rotor slide rotates synchronously with the rotor inner ring. The rotor slide is located outside the rotor inner ring and extends outward, contacting the inner side of the fixed outer ring. The rotation frequency of the timing cam structure is matched with the rotation frequency of the rotor slide, so that when the rotor slide rotates to the limiting slide side, the limiting slide moves radially outward. After the rotor slide passes, the limiting slide moves radially inward to reset, and is precisely reset under the action of the return spring. The first annular cylinder is equipped with an air inlet valve port, which is connected to an air inlet pipe for a hydrogen-oxygen mixture; the air inlet pipe is equipped with an air inlet regulating system with an electrically controlled valve; The first annular cylinder has an external high-pressure gas pipe and a high-pressure gas output port connected to the high-pressure gas pipe; the second annular cylinder has an external combustion chamber connected to the high-pressure gas pipe and an exhaust valve port and an air inlet port connected to the combustion chamber; the two ends of the high-pressure gas pipe are respectively equipped with a first solenoid valve and a second solenoid valve. The range extender controller includes a first sensor, a second sensor, and a control chip; the first sensor is used to monitor the gas concentration entering the combustion chamber through the high-pressure gas pipe, i.e., the mixing ratio of hydrogen and oxygen mixture, and the second sensor is used to monitor the temperature inside the combustion chamber. The control chip is connected to the first and second sensors, and to the electronically controlled valve of the intake regulating system; the control chip is connected to the generator controller of the generator set, and to the battery power reading meter of the vehicle battery; the control chip is connected to the first solenoid valve and the second solenoid valve.

2. The power range extender system for a range-extended electric vehicle according to claim 1, characterized in that: The air inlet of the first annular cylinder is located on one side of the limiting slide, and the high-pressure gas outlet of the first annular cylinder is located on the other side of the limiting slide.

3. The power range extender system for a range-extended electric vehicle according to claim 2, characterized in that: The space between the limiting slide and the rotor slide of the first annular cylinder is a closed annular space with a circumference of 300±30°.

4. A power range extender system for a range-extended electric vehicle according to claim 3, characterized in that: The interior of the second annular cylinder is divided into two regions by a limiting slide and a rotor slide, which are the power region and the exhaust region, respectively; the exhaust valve port of the second annular cylinder is located on one side of the limiting slide.

5. A range extension method using the range extender system according to any one of claims 1 to 4, characterized in that: The hydrogen-oxygen mixture is fed into the annular cylinder, driving the inner ring of the rotor to rotate. This cycle completes the intake and compression, power and exhaust processes. While the annular cylinder is rotating, the synchronous shaft drives the generator set to charge the electric vehicle's battery pack, thus extending the battery pack's range. The range extender controller determines whether to charge the battery pack based on its power consumption rate.

6. The range extender method according to claim 5, characterized in that: The annular cylinders are arranged in pairs. The first annular cylinder cycles through intake and compression, while the second annular cylinder cycles through power and exhaust. The high-pressure gas formed by intake and compression in the first annular cylinder is input into the combustion chamber and ignited by the spark plug. The resulting high-temperature and high-pressure gas is input into the second annular cylinder, where it performs power and then exhausts.

7. The range extender method according to claim 6, characterized in that: The range extender controller monitors the gas concentration and temperature entering the combustion chamber in real time, and regulates the mixing ratio of hydrogen-oxygen mixture and the temperature inside the combustion chamber to achieve constant power continuous operation; the range extender controller controls the hydrogen concentration to above 76% and the temperature inside the combustion chamber to within 800~1200℃.

8. The range extender method according to claim 7, characterized in that: The range extender controller continuously adjusts the supply of hydrogen-oxygen mixture gas according to the power output curve of the power unit, so as to keep the system working near the rated point and achieve constant power operation.

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