New energy motor vehicle range extending system and method

Abstract

According to the range extending system and method for the new energy motor vehicle, power battery packs are arranged to be three independent power battery packs including a power battery pack D1, a power battery pack D2 and a power battery pack D3, and in the running process of the vehicle, firstly, one of the power battery packs drives the vehicle to run; when the electric quantity of the power battery pack is low to only support the vehicle to run on the flat road, the other power battery pack is started to assist the previous power battery pack to supply power to the motor M and support the vehicle to start and climb, so that the voltage over-discharge of the power battery packs is avoided, the energy recovery system is optimized, and the recovered energy of the vehicle is fully utilized; and the service life of the power battery is prolonged. The range-extending small-power internal combustion engine drives the small-power generator G to generate electricity, so that the power of a range-extending system is greatly reduced, the weight of a vehicle body is reduced, the vehicle manufacturing cost is reduced, the energy-saving effect is better, the vehicle is more environment-friendly, a power battery pack is more convenient to maintain or replace, and the cost performance of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy motor vehicle power systems, and specifically to a range extender system and method for new energy motor vehicles. Background Art

[0002] With the continuous improvement of human environmental protection awareness and the depletion of oil energy, the elimination of fuel motor vehicles has become inevitable. The development prospects of new energy motor vehicles that do not rely on traditional fuel power methods have attracted more and more attention from countries and regions around the world. Vigorously researching and developing new energy motor vehicle technologies and seizing the high ground of international intellectual property rights have become the top priority for China to develop the new energy motor vehicle industry. Among new energy motor vehicles, range-extended new energy motor vehicles can basically retain the usage habits of fuel vehicles and have good advantages in terms of performance, fuel consumption, NVH performance, etc. Range-extended electric motor vehicles seem to be perfect substitutes for fuel vehicles and have good development prospects.

[0003] However, the current range-extended new energy motor vehicles simply add a range extender engine and a generator to pure electric motor vehicles. When the power battery runs out of power, the engine is started to generate electricity to charge the power battery and drive the vehicle to continue running. This not only increases the cost, but also the energy-saving effect is not very obvious. There are four working states of range-extended new energy motor vehicles: the first state is that the power battery pack has sufficient power, and the power battery pack directly supplies power to the motor to drive the vehicle; the second state is that the range extender generates electricity to supply power to the motor to drive the vehicle; the third state is that the range extender generates electricity and the power battery pack supply power to the motor simultaneously to drive the vehicle; the fourth state is that the range extender generates electricity, charging the battery while supplying power to the motor to drive the vehicle. Therefore, the power of the range extender engine of current range-extended new energy motor vehicles must be large enough, and the battery is charged and discharged simultaneously, which damages the service life of the power battery. For example, the range extender engine of the C11 extended range version of a certain brand is 1.2T, with a maximum power of about 96KW, and the fuel consumption per 100 kilometers in the WLTC working condition with a depleted battery is 6.8 liters. It can be seen that its fuel consumption is large, not only the fuel efficiency is low, but also the service life of the battery will be shortened, and its economy needs to be improved. Summary of the Invention

[0004] In view of the current deficiencies in the above-mentioned range extender system and technical method for new energy motor vehicles, the object of the present invention is to provide a range extender system and method for new energy motor vehicles. Through innovative and optimized design of the existing range extender system and technology, the modular structure of the power battery pack is improved, the control management and discharge and charging methods of the high-voltage power battery are improved, and a regenerative energy charger is added to prevent the power battery from discharging while charging. At the same time, the working state, matching power and structural design of the internal combustion engine are changed, the power of the internal combustion engine of the range extender is reduced, the matching power of the internal combustion engine is lowered, and the vehicle is lightened. On the premise of ensuring that the total electric energy supplied to the power battery does not decrease, the efficiency of the internal combustion engine is improved and the manufacturing cost of the vehicle is reduced, further reducing energy consumption, improving the economy of range-extended new energy motor vehicles and further enhancing the environmental friendliness of new energy motor vehicles.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A range extender system and method for new energy motor vehicles, which consists of wheels, a differential drive system, a motor M, a display screen, a vehicle driving controller, a power battery pack, an on-vehicle charging system, a socket and a plug, and some components of a range extender assembly; the power battery pack that constitutes the range extender system is composed of D 1 power battery packs and D 2 power battery packs and D 3 three independent power battery packs respectively. The D 1 power battery pack and D 2 power battery pack and D 3 discharge output terminals of the power battery packs are connected to the vehicle driving controller via a power supply conversion switch K 2 and supply power to the motor M respectively under the control of the power supply conversion switch K 2 to drive the wheels to rotate; the D 1 power battery pack and D 2 power battery pack and D 3 charging input terminals of the power battery packs are connected to a small power generator G via a range extender charging conversion switch K 1 The small power generator G is driven by a small power internal combustion engine to generate electricity and charge the D 1 power battery pack and D 2 power battery pack and D 3 power battery packs respectively. The on-vehicle charging system, socket and plug that constitute the range extender system are composed of an on-vehicle charging pile intelligent controller and a charging pile socket, and an on-vehicle home intelligent charger and a home charging plug. One end of the on-vehicle charging pile intelligent controller and the on-vehicle home intelligent charger are respectively connected to the D 1 power battery pack and D 2 power battery pack and D 3The charging input terminal of the power battery pack is connected; the other end of the in-vehicle charging pile intelligent controller is connected to the charging pile socket, and the other end of the in-vehicle home intelligent charger is connected to the home charging plug. The range extender system is provided with a recycled energy charger, and the input end of the recycled energy charger is connected to the energy recovery system of the vehicle braking energy and coasting energy, and the output end is connected to the range extender charging switch K 1 is connected.

[0007] Furthermore, a range extender system and method for a new energy motor vehicle, the range extender method is that when the vehicle starts to operate with full charge and full fuel, the D of the power battery pack 1 The power battery pack is connected to the vehicle driving controller through the closing of the c end of the power supply switch K 2 , and supplies power to the motor M under the control of the vehicle driving controller to drive the vehicle; when D 1 The power is low to only support the vehicle to drive on flat roads, D 2 The power battery pack is connected to the vehicle driving controller through the closing of the b end of the power supply switch K 2 , assisting D 1 to supply power to the motor M to support the large battery power required for vehicle starting and climbing conditions; when D 1 The power is discharged to the rated minimum discharge voltage, the c end of the power supply switch K 2 disconnects, cuts off the connection with the vehicle driving controller, and stops supplying power to the motor M. After that, D 1 The power battery pack is connected to the small power generator G through the closing of the d end of the charging switch K 1 , and waits for the small power internal combustion engine to start generating electricity to charge it; at this time, the vehicle only relies on D 2 The power battery pack supplies power to the motor M to drive; when D 2 The power of the power battery pack is low to only support the vehicle to drive on flat roads, D 3 The power battery pack is connected to the vehicle driving controller through the closing of the a end of the power supply switch K 2 , assisting D 2 to supply power to the motor M to support the large battery power required for vehicle starting and climbing conditions; when D 2 The power is discharged to the rated minimum discharge voltage, the b end of the power supply switch K 2 disconnects, cuts off the connection with the vehicle driving controller, and stops supplying power to the motor M. After that, D 2 The power battery pack is connected to the small power generator G through the closing of the e end of the charging switch K 1 , and waits for the small power internal combustion engine to start generating electricity to charge it; at this time, the vehicle only relies on D 3 The power battery pack supplies power to the motor M to drive; when D 3When the power of the power battery pack is so low that it can only support the vehicle to drive on flat roads, D that has been charged to full power by range extender 1 The power battery pack is connected to the vehicle driving controller through the c terminal of the power supply conversion switch K 2 to assist D 3 to supply power to the motor M, supporting the large battery power required for vehicle starting and climbing conditions; when D 3 discharges to the rated minimum discharge voltage, the a terminal of the power supply conversion switch K 2 disconnects, cutting off the connection with the vehicle driving controller and stopping supplying power to the motor M. After that, D 3 The power battery pack is connected to the small power generator G through the f terminal of the charging conversion switch K 1 to wait for the small power internal combustion engine to start generating electricity for charging it; at this time, the vehicle starts to rely only on D 1 The power battery pack is connected to the vehicle driving controller through the c terminal of the power supply conversion switch K 2 to supply power to the motor M to drive the vehicle to travel and start the vehicle's range-extended driving.

[0008] Furthermore, a range extender system and method for a new energy motor vehicle, D in the battery pack 1 The power battery pack and D 2 The power battery pack and D 3 The power battery pack are each connected with an anti-reverse charging diode - that is, D 1 One end of the power battery pack is connected with an anti-reverse charging diode Vd 1 ; D 2 One end of the power battery pack is connected with an anti-reverse charging diode Vd 2 ; D 3 One end of the power battery pack is connected with an anti-reverse charging diode Vd 3 .

[0009] Furthermore, a range extender system and method for a new energy motor vehicle, the small power generator G only charges one group of power battery packs in the power battery pack of D 1 The power battery pack, D 2 The power battery pack, D 3 The power battery pack; the output power of the small power internal combustion engine and the small power generator G is preferably one-half to one-third of the power of the current well-known internal combustion engine and generator.

[0010] Further, a range extender system and method for a new energy motor vehicle. The in-vehicle home intelligent charger mainly consists of a rectifier circuit and an intelligent control circuit. The intelligent control circuit has the functions of identifying the terminal voltage of the power battery pack and preventing overcharging. The AC input power and DC output power of the in-vehicle home intelligent charger are preferably one-half to one-third of the power of the current well-known in-vehicle home charger. When the in-vehicle home intelligent charger is working, it intelligently selects a group with the lowest terminal voltage from the D 1 power battery packs, D 2 power battery packs, D 3 power battery packs to charge until each group is charged to the set optimal full charge voltage value.

[0011] Further, a range extender system and method for a new energy motor vehicle. The intelligent controller of the in-vehicle charging pile connects the D 1 power battery packs, D 2 power battery packs, D 3 power battery packs in parallel to allow the charging pile to charge three power battery packs to the set optimal full charge voltage value at the same time.

[0012] Further, a range extender system and method for a new energy motor vehicle. The range extender charging switch K 1 and the power supply switch K 2 are linked and interlocked normally open electronic switches. The range extender charging switch K 1 is provided with three switching gears I, II, and III. In gear I, the d terminal is closed (at this time, the K 2 linkage causes the c terminal to be disconnected), connecting the D 1 power battery pack to the small power generator G, and the power generation is only for charging the D 1 power battery pack; in gear II, the e terminal is closed (at this time, the K 2 linkage causes the b terminal to be disconnected), connecting the D 2 power battery pack to the small power generator G, and the power generation is only for charging the D 2 power battery pack; in gear III, the f terminal is closed (at this time, the K 2 linkage causes the a terminal to be disconnected), connecting the D 3 power battery pack to the small power generator G, and the power generation is only for charging the D 3 power battery pack.

[0013] Further, a range extender system and method for a new energy motor vehicle. The power supply switch K 2 is provided with three switching gears I, II, and III. In gear I, the c terminal is closed, connecting the motor M to the D 1 power battery pack through the vehicle driving controller, and the D 1 power battery pack supplies power to the motor M, enabling the motor M to drive the wheels to rotate or assist the D3 Starting and climbing of a vehicle with a power battery pack; when terminal b of the second gear is closed, the motor M is connected to D via the vehicle driving controller 2 The power battery pack is connected, and by D 2 The power battery pack supplies power to the motor M, causing the motor M to drive the wheels to rotate or assist D 1 Starting and climbing of a vehicle with a power battery pack; when terminal a of the third gear is closed, the motor M is connected to D via the vehicle driving controller 3 The power battery pack is connected, and by D 3 The power battery pack supplies power to the motor M, causing the motor M to drive the wheels to rotate or assist D 2 Starting and climbing of a vehicle with a power battery pack.

[0014] Furthermore, a range extender system and method for a new energy motor vehicle. The power battery pack can also be configured into more than three power battery groups according to the power of the new energy motor vehicle.

[0015] The beneficial effects of the present invention are as follows: First, since the power battery pack of the vehicle is set as three independent power battery groups, the power of the matching on-vehicle charging device can be greatly reduced to one-third, which is closer to the load capacity of the household power supply line; Second, three power battery groups are equipped and two of them drive the vehicle. The internal combustion engine of the range extender assembly drives the small-power generator G to generate electricity, and alternately charges one of the power battery groups without participating in driving the vehicle, so that the power of the internal combustion engine of the range extender is greatly reduced and always works at a constant power output at the best fuel economy point. The working conditions of the internal combustion engine are relatively single, with high thermal efficiency, avoiding fluctuations in the state of the internal combustion engine caused by the selection of working conditions, and having better energy-saving effect and environmental protection; Third, when any one of the three power battery groups discharges to a low power level, it can be assisted by another power battery group for vehicle starting and climbing, which not only supports the performance of the vehicle in better starting and climbing conditions, especially avoids over-discharge of the power battery group voltage, and is more beneficial to extending the life of the power battery group; Fourth, the performance of the energy recovery system for vehicle braking energy and coasting energy is optimized, so that the energy recovered by the vehicle is fully utilized; Fifth, setting the power battery pack of the vehicle as three power battery groups is more convenient for the maintenance or replacement of the power battery group; Sixth, reducing the rated power of the range extender internal combustion engine and the generator, thereby reducing the body weight of the vehicle, reducing the vehicle manufacturing cost, improving the energy conversion rate, and improving the vehicle cost performance. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Additionally, it should be noted that the attached Figure 1 to the attached Figure 9 are all schematic diagrams and electrical connection and working principle diagrams, not mechanical design drawings of components, nor detailed and accurate wiring diagrams of electrical components. Although that's all, for those of ordinary skill in the art, it can be achieved without creative efforts.

[0017] Figure 1 is a schematic diagram of the main part structure of the embodiment of the present invention.

[0018] Figure 2 is the main control electrical appliance and electrical circuit block diagram of the embodiment of the present invention.

[0019] Figure 3 is the embodiment D of the present invention 1 is the power supply circuit block diagram for the motor M.

[0020] Figure 4 is the embodiment D of the present invention 2 Auxiliary D 1 is the power supply circuit block diagram for the motor M.

[0021] Figure 5 is the embodiment D of the present invention 2 Power supply for the motor M and range - extending power generation for D 1 is the charging circuit block diagram.

[0022] Figure 6 is the embodiment D of the present invention 3 Auxiliary D 2 is the power supply circuit block diagram for the motor M.

[0023] Figure 7 is the embodiment D of the present invention 3 Power supply for the motor M and range - extending power generation for D 2 is the charging circuit block diagram.

[0024] Figure 8 is the embodiment D of the present invention 1 Auxiliary D 3 is the power supply circuit block diagram for the motor M.

[0025] Figure 9 is the embodiment D of the present invention 1 Power supply for the motor M and range - extending power generation for D 3 is the charging circuit block diagram.

[0026] The descriptions of the reference numerals are as follows:

[0027] Figure 1 In [description context], 1 is a wheel; 2 is a differential drive system; 3 is an electric motor M; 4 is a display screen; 5 is a vehicle driving controller; 6 is an energy recovery charger; 7 is a power supply conversion switch K 2 ; 8 is a power battery pack; 9 is D 1 Power battery pack; 10 is D 2 Power battery pack; 11 is an intelligent controller of on-vehicle charging pile; 12 is D 3 Power battery pack; 13 is an extended-range charging conversion switch K 1 ; 14 is an on-vehicle home intelligent charger; 15 is an on-vehicle charging system, socket and plug; 16 is a small power generator G; 17 is a small power internal combustion engine; 18 is an extended-range generator assembly. Figure 2 In [description context], Vd 1 is D 1 The anti-reverse charging diode of the power battery pack; Vd 2 is D 2 The anti-reverse charging diode of the power battery pack; Vd 3 is D 3 The anti-reverse charging diode of the power battery pack; MOS is the extended-range charging conversion switch K 1 and the power supply conversion switch K 2 The switching semiconductor devices used. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only one embodiment of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that in the description of the present invention, the terms "in", "upper", "lower", "inner", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. Here, it is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0030] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "set", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] During implementation, refer to Figure 1 : A specific implementation of a range extender system and method for a new energy motor vehicle. The system mainly consists of components such as a wheel (1), a differential drive system (2), a motor M (3), a display screen (4), a vehicle driving controller (5), a regenerative energy charger (6), a power supply conversion switch K 2 (7), a power battery pack (8), a D1 power battery group (9), a D2 power battery group (10), an in-vehicle charging pile intelligent controller (11), a D3 power battery group (12), a range extender charging conversion switch K1 (13), an in-vehicle home intelligent charger (14), an in-vehicle charging system and socket and plug (15), a small power generator G (16), a small power internal combustion engine (17), and a range extender assembly (18). Among them, the power battery pack (8) is composed of three independent power battery groups, namely the D1 power battery group (9), the D2 power battery group (10), and the D3 power battery group (12). The discharge output terminals of the D1 power battery group (9), the D2 power battery group (10), and the D3 power battery group (12) are connected to the vehicle driving controller (5) through the power supply conversion switch K 2 (7), and supply power to the motor M (3) to rotate under the control of the power supply conversion switch K 2 (7), and its torque drives the wheel (1) to travel through the differential drive system (2). The charging input terminals of the D1 power battery group (9), the D2 power battery group (10), and the D3 power battery group (12) are connected to the small power generator G (16) through the range extender charging conversion switch K1 (13). The small power internal combustion engine (17) drives the small power generator G (16) to generate electricity, providing range extender charging for the D1 power battery group (9), the D2 power battery group (10), and the D3 power battery group (12) in the power battery pack (8) respectively. The in-vehicle charging system and socket and plug (15) of the range extender system consists of an in-vehicle charging pile intelligent controller (11) and a charging pile socket, and an in-vehicle home intelligent charger (14) and a home charging plug. One end of the in-vehicle charging pile intelligent controller (11) and the in-vehicle home intelligent charger (14) are respectively connected to the D 1 power battery group and D 2 power battery group and D 3The charging input end of the power battery pack is connected; the other end of the in-vehicle charging pile intelligent controller (11) is connected to the charging pile socket, and the other end of the in-vehicle home intelligent charger (14) is connected to the home charging plug. A regenerative energy charger (6) is set in the range extender system, and the regenerative energy charger (6) converts the electric energy from the recovered vehicle braking energy and coasting energy, and loads it into the D1 power battery pack (9), or D2 power battery pack (10), or D3 power battery pack (12) waiting for charging in the power battery pack (8) through the range extender charging switch K 1 to charge the D1 power battery pack (9), or D2 power battery pack (10), or D3 power battery pack (12) through the range extender charging switch K

[0032] In implementation, refer to Figure 1 : The battery cells in the three power battery packs of the power battery pack (8) are all selected as lithium iron phosphate batteries. When the total capacity is selected to be about 45KW, that is, the capacities of the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) are each about 15KW; the nominal voltages of the three power battery packs are basically equal, and the voltage value range matches the motor according to the national standard. In this embodiment, it is selected between 380V and 560V.

[0033] In implementation, refer to Figure 2 : The range extender charging switch K1(13) and the power supply switch K 2 are interlocked and normally open switches; among them, K 1 (13), K 2 (5) are made of power electronic devices, and the switching elements can use semiconductor switching tubes such as MOS tubes or contactors.

[0034] In implementation, a small power generator G (16) of a new energy vehicle range extender system and method is driven by a small power internal combustion engine (17) to charge one of the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8).

[0035] In implementation, refer to Figure 1 : The in-vehicle home intelligent charger (14) of a new energy vehicle range extender system and method mainly consists of a rectifier circuit and an intelligent control circuit. The intelligent control circuit has the functions of identifying and preventing overcharging of the terminal voltages of the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) of the power battery pack (8); when the in-vehicle home intelligent charger (14) works, it intelligently selects a group with the lowest terminal voltage from the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) for charging until each group is charged to the set optimal full charge voltage value.

[0036] In implementation, refer toFigure 1 : A range extender system and method for new energy motor vehicles. The intelligent controller (11) of the on-vehicle charging pile connects the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) in parallel, so that the charging pile charges the three power battery packs to the set optimal full charge voltage value at the same time.

[0037] During implementation, refer to Figure 2 : The range extender charging conversion switch K1 (13) and the power supply conversion switch K2 (7) of a range extender system and method for new energy motor vehicles are interlocked and normally open electronic switches, mainly made of MOS transistors. The range extender charging conversion switch K1 (13) is provided with three switching gears I, II, and III. When the d terminal of gear I is closed [at this time, the c terminal of the power supply conversion switch K2 (7) is interlocked and disconnected], the D1 power battery pack (9) is connected to the small power generator G (16), and the power generation only charges the D1 power battery pack (9); when the e terminal of gear II is closed [at this time, the b terminal of the power supply conversion switch K2 (7) is interlocked and disconnected], the D2 power battery pack (10) is connected to the small power generator G (16), and the power generation only charges the D2 power battery pack (10); when the f terminal of gear III is closed [at this time, the a terminal of the power supply conversion switch K2 (7) is interlocked and disconnected], the D3 power battery pack (12) is connected to the small power generator G (16), and the power generation only charges the D3 power battery pack (12).

[0038] During implementation, refer to Figure 2 : The power supply conversion switch K2 (7) of a range extender system and method for new energy motor vehicles is provided with three switching gears I, II, and III. Among them, when the c terminal of gear I is closed, the motor M (3) is connected to the D1 power battery pack (9) through the vehicle driving controller (5), and the D1 power battery pack (9) supplies power to the motor M (3) through the vehicle driving controller (5), so that the motor M (3) drives the wheel (1) to rotate or assists the D3 power battery pack (12) to drive the vehicle to start and climb slopes; when the b terminal of gear II is closed, the motor M (3) is connected to the D2 power battery pack (10) through the vehicle driving controller (5), and the D2 power battery pack (10) supplies power to the motor M (3) through the vehicle driving controller (5), so that the motor M (3) drives the wheel (1) to rotate or assists the D1 power battery pack (9) to drive the vehicle to start and climb slopes; when the a terminal of gear III is closed, the motor M (3) is connected to the D3 power battery pack (12) through the vehicle driving controller (5), and the D3 power battery pack (12) supplies power to the motor M (3) through the vehicle driving controller (5), so that the motor M (3) drives the wheel (1) to rotate or assists the D2 power battery pack (10) to drive the vehicle to start and climb slopes.

[0039] During implementation, refer to Figure 2The D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) are connected to the display screen (4) via the vehicle driving controller (5), supporting the viewing of the charging, discharging, and charge SOC status of the three power battery packs, namely the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12), on the display screen (4), as well as the start of the range extender charging prompt.

[0040] During implementation, when parking and using a charging pile to charge the vehicle, the charging pile connector should be inserted into the socket of the on-vehicle charging system, socket, and plug (15); at this time, the on-vehicle charging pile intelligent controller (11) will connect the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) in parallel, allowing the charging pile to charge the D 1 、D 2 、D 3 three power battery packs to the set optimal full charge voltage value.

[0041] During implementation, when parking and using household electricity to charge the vehicle, insert the plug of the on-vehicle charging system, socket, and plug (15) into a suitable household socket. The on-vehicle household intelligent charger (14) will intelligently select the power battery pack with the lowest terminal voltage in the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) to charge it until the three power battery packs, namely the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12), are all fully charged to the set optimal full charge voltage value.

[0042] During implementation, before each vehicle starts to drive on the road, the plug in the on-vehicle charging system, socket, and plug (15) should be inserted into a household high-power safety socket to connect to the mains electricity, or the charging gun of the charging pile should be inserted into the socket of the on-vehicle charging system, socket, and plug (15), and the vehicle should be fully charged and filled with fuel to ensure there is an appropriate amount of energy to support the vehicle's driving. The following will further elaborate on the principle of a new energy vehicle range extender system and method of the present invention in combination with Figures 3 to 9 will further and more detailedly explain the principle of a new energy vehicle range extender system and method of the present invention.

[0043] Furthermore, the first time period: Refer to Figure 3 , the vehicle starts driving with a full charge and full fuel. The D1 power battery pack (9) supplies power to the motor M (3) to work - that is, at this time, the D1 power battery pack (9) is connected to the vehicle driving controller (5) through the closing of the c terminal of the power supply conversion switch K2 (7), and supplies power to the motor M (3) under the control of the vehicle driving controller (5) to drive the vehicle.

[0044] Furthermore, the second time period: Refer to Figure 4, when the D1 power battery pack (9) discharges to a relatively low level of the stored electricity in the battery and can only support the vehicle to drive on flat roads, the D2 power battery pack (10) assists the D1 power battery pack (9) to supply power to the motor M (3) to support the vehicle to drive under starting and climbing conditions - that is, when the D1 power battery pack (9) discharges to a relatively low level of the stored electricity in the battery and can only support the vehicle to drive on flat roads, and the starting and climbing conditions require the battery to output high power which will cause over-discharge, the D2 power battery pack (10) is connected to the vehicle driving controller (5) through the closing of the b terminal of the power supply conversion switch K2 (7), assists the D1 power battery pack (9) to supply power to the motor M (3), supports the vehicle to start and climb. Under non-starting and non-climbing conditions, the D1 power battery pack (9) continues to discharge to supply power to the motor M (3) to support the vehicle to continue driving on flat roads until the D1 power battery pack (9) discharges to the rated minimum discharge voltage.

[0045] Further, the third time period: Refer to Figure 5 , when the D1 power battery pack (9) discharges to reach the rated minimum discharge voltage value, the D2 power battery pack (10) supplies power to the motor M (3) and the small power generator G (16) charges the D1 power battery pack (9) - that is, at this time, on the one hand, the D2 power battery pack (10) is connected to the vehicle driving controller (5) through the closing of the b terminal of the power supply conversion switch K2 (7) to continue supplying power to drive the vehicle; on the other hand, the D1 power battery pack (9) is connected to the small power generator G (16) through the closing of the d terminal of the range-extending charging conversion switch K1 (13), and waits for the range-extending small power internal combustion engine (17) to start generating electricity to charge the D 1 power battery pack (9).

[0046] Further, the fourth time period: Refer to Figure 6 , when the D2 power battery pack (10) discharges to a relatively low level of the stored electricity in the battery and can only support the vehicle to drive on flat roads, the D3 power battery pack (12) assists the D2 power battery pack (10) to supply power to the motor M (3) to support the vehicle to drive under starting and climbing conditions - that is, when the D2 power battery pack (10) discharges to a relatively low level of the stored electricity in the battery and can only support the vehicle to drive on flat roads, and the starting and climbing conditions require the battery to output high power which will cause over-discharge, the D3 power battery pack (12) is connected to the vehicle driving controller (5) through the closing of the a terminal of the power supply conversion switch K2 (7), controls the D3 power battery pack (12) to assist the D 2 to supply power to the motor M (3) to support the vehicle to start and climb under working conditions. Under non-starting and non-climbing conditions, the D2 power battery pack (10) continues to discharge to supply power to the motor M (3) to support the vehicle to continue driving on flat roads until the D2 power battery pack (10) discharges to the rated minimum discharge voltage.

[0047] Further, fifth time period: Refer to Figure 7 , when the D2 power battery pack (10) discharges to reach the rated minimum discharge voltage value, the D3 power battery pack (12) supplies power to the motor M (3) and the small power generator G (16) charges the D2 power battery pack (10) - that is, at this time, on the one hand, the D3 power battery pack (12) is connected to the vehicle driving controller (5) through the closing of the a end of the power supply conversion switch K2 (7) to continue supplying power to the motor M (3) to drive the vehicle to travel; on the other hand, the D2 power battery pack (10) is connected to the small power generator G (16) through the closing of the e end of the range-extending charging conversion switch K1 (13), and waits for the range-extending small power internal combustion engine (17) to start generating electricity to charge the D2 power battery pack (10).

[0048] Further, sixth time period: Refer to Figure 8 , when the D3 power battery pack (12) discharges to a relatively small amount of electricity stored in the battery and can only support the vehicle to travel on flat roads, the D1 power battery pack (9) assists the D3 power battery pack (12) to supply power to the motor M (3) to support the vehicle starting and climbing conditions - that is, when the D3 power battery pack (12) discharges to a relatively small amount of electricity stored in the battery and can only support the vehicle to travel on flat roads, and the starting and climbing conditions require the battery to output a large power which will cause over-discharge, the D1 power battery pack (9) is connected to the vehicle driving controller (5) through the closing of the c end of the power supply conversion switch K2 (7) to assist the D3 power battery pack (12) to supply power to the motor M (3) to support the vehicle starting and climbing conditions. Under non-starting and non-climbing conditions, the D3 power battery pack (12) continues to discharge to supply power to the motor M (3) to support the vehicle to continue traveling on flat roads until the D3 power battery pack (12) discharges to the rated discharge voltage.

[0049] Further, seventh time period: Refer to Figure 9 , when the D3 power battery pack (12) discharges to reach the rated minimum discharge voltage value, the D1 power battery pack (9) supplies power to the motor M (3) and the small power generator G (16) charges the D3 power battery pack (12) - that is, at this time, on the one hand, the D1 power battery pack (9) is connected to the vehicle driving controller (5) through the closing of the c end of the power supply conversion switch K2 (7) to continue supplying power to the motor M (3) to drive the vehicle to travel; on the other hand, the D3 power battery pack (12) is connected to the small power generator G (16) through the closing of the f end of the range-extending charging conversion switch K1 (13), and waits for the range-extending small power internal combustion engine (17) to start generating electricity to charge the D3 power battery pack (12).

[0050] Further, for a range extender system and method of a new energy motor vehicle according to the present invention, the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) are discharged in sequence in a cycle and, with the assistance of another battery pack, are discharged to the lowest discharge voltage allowed for the battery pack.

[0051] Further, for a range extender system and method of a new energy motor vehicle according to the present invention, the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12) in the power battery pack (8) are charged in sequence in a cycle with the help of a range extender low-power generator G (16) or an in-vehicle home intelligent charger (14) and are charged to the highest charging voltage allowed for the battery pack.

[0052] Further, for a range extender system and method of a new energy motor vehicle according to the present invention, when the mileage traveled by the vehicle does not exceed the pure electric driving mileage of the vehicle and the vehicle can obtain the working condition of mains power charging, the driver commands the in-vehicle home intelligent charger (14) to prohibit the start of the range extender and disconnect the low-power generator G (16) by operating the display screen (4), so as to ensure that the vehicle operates in the pure electric mode.

[0053] The principle of the energy recovery system of the range extender system and method of a new energy motor vehicle according to the present invention is the same as that of the well-known and commonly used electric vehicle technology and does not need to be protected, so it will not be elaborated here.

[0054] Further, for a range extender system and method of a new energy motor vehicle according to the present invention, the vehicle power battery pack (8) in this embodiment is composed of three power battery packs, namely, the D1 power battery pack (9), D2 power battery pack (10), and D3 power battery pack (12), which is just one embodiment; in the production of new energy motor vehicles, the power battery pack (8) can be configured with more than three power battery packs according to the power of the vehicle; however, the technical methods for adding these power battery packs all belong to different practical applications of the present invention.

[0055] The above is only the implementation mode of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

[0056] Obviously, those skilled in the art can implement the present invention on various motor vehicles, including but not limited to various new energy vehicles, motorcycles, agricultural motor vehicles, wheeled special machinery vehicles, etc. with range extender requirements. However, these implementations all belong to the practical applications of the system and method of the present invention.

[0057] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the basic structure and working method of the system of the present invention. However, these modifications and variations still fall within the scope of the technical solution of the present invention.

Claims

1. A range extender system and method for a new energy motor vehicle, which consists of components such as wheels, a differential drive system, a motor M, a display screen, a vehicle driving controller, a power battery pack, an on-vehicle charging system, a socket and a plug, and a range extender assembly. It is characterized in that The power battery pack constituting the range extender system is composed of D 1 the power battery pack and D 2 the power battery pack and D 3 three separately independent power battery packs. The D 1 power battery pack and D 2 the power battery pack and D 3 discharge output terminals of the power battery pack are connected to the vehicle driving controller through the power supply conversion switch K 2 and supply power to the motor M respectively under the control of the power supply conversion switch K 2 to drive the wheels to rotate; the D 1 power battery pack and D 2 the power battery pack and D 3 charging input terminals of the power battery pack are connected to the small power generator G through the range extender charging conversion switch K 1 and the small power generator G is driven by a small power internal combustion engine to generate electricity to charge D 1 the power battery pack and D 2 the power battery pack and D 3 the power battery packs respectively. The on-vehicle charging system, socket and plug that constitute the range extender system are composed of an on-vehicle charging pile intelligent controller, a charging pile socket, an on-vehicle home intelligent charger and a home charging plug; one ends of the on-vehicle charging pile intelligent controller and the on-vehicle home intelligent charger are respectively connected to D 1 the power battery pack and D 2 the power battery pack and D 3 the charging input end of the power battery pack; the other end of the on-vehicle charging pile intelligent controller is connected to the charging pile socket, and the other end of the on-vehicle home intelligent charger is connected to the home charging plug. The described range extender system is provided with a recuperative energy charger. The input end of the recuperative energy charger is connected to the energy recovery system for vehicle braking energy and coasting energy, and the output end is connected to the range extender charging conversion switch K 1 Connect.

2. The range extender system and method for a new energy motor vehicle according to claim 1, It is characterized in that The described range extender method starts when the vehicle starts running with a full battery and full fuel. The D of the power battery pack 1 The power battery pack is connected to the vehicle driving controller through the closed c terminal of the power supply conversion switch K 2 and supplies power to the motor M under the control of the vehicle driving controller to drive the vehicle. When D 1 The power is low to only support the vehicle to drive on flat roads, D 2 The power battery pack is connected to the vehicle driving controller through the closed b terminal of the power supply conversion switch K 2 to assist D 1 in supplying power to the motor M to support the large battery power required for vehicle starting and climbing conditions. When D 1 The power is discharged to the rated minimum discharge voltage, the c terminal of the power supply conversion switch K 2 is disconnected to cut off the connection with the vehicle driving controller and stop supplying power to the motor M. After that, D 1 The power battery pack is connected to the small power generator G through the closed d terminal of the charging conversion switch K 1 and waits for the small power internal combustion engine to start generating electricity to charge it. At this time, the vehicle is driven only by D 2 The power battery pack supplies power to the motor M. When D 2 The power of the power battery pack is low to only support the vehicle to drive on flat roads, D 3 The power battery pack is connected to the vehicle driving controller through the closed a terminal of the power supply conversion switch K 2 to assist D 2 in supplying power to the motor M to support the large battery power required for vehicle starting and climbing conditions. When D 2 The power is discharged to the rated minimum discharge voltage, the b terminal of the power supply conversion switch K 2 is disconnected to cut off the connection with the vehicle driving controller and stop supplying power to the motor M. After that, D 2 The power battery pack is connected to the small power generator G through the closed e terminal of the charging conversion switch K 1 and waits for the small power internal combustion engine to start generating electricity to charge it. At this time, the vehicle is driven only by D 3 The power battery pack supplies power to the motor M. When D 3 The power of the power battery pack is low to only support the vehicle to drive on flat roads, and the D 1 The power battery pack that has been range-extended and fully charged is connected to the vehicle driving controller through the closed c terminal of the power supply conversion switch K 2 to assist D 3 in supplying power to the motor M to support the large battery power required for vehicle starting and climbing conditions. When D 3 The power is discharged to the rated minimum discharge voltage, the power supply conversion switch K 2 The a terminal of is disconnected, cutting off the connection with the vehicle driving controller and stopping the power supply to the motor M. After that, D 3 The power battery pack passes through the charging conversion switch K 1 The f terminal of is closed to connect with the small power generator G, and wait for the small power internal combustion engine to start generating electricity to charge it; at this time, the vehicle starts to rely only on D 1 The power battery pack passes through the power supply conversion switch K 2 The c terminal of is closed to connect with the vehicle driving controller, supply power to the motor M to drive the vehicle to travel, and start the vehicle range extender driving.

3. The range extender system and method for a new energy motor vehicle according to claims 1 and 2, It is characterized in that D in the battery pack described 1 the power battery pack and D 2 the power battery pack and D 3 the power battery pack is respectively connected with an anti - reverse charge diode - namely D 1 One end of the power battery pack is connected with an anti - reverse charge diode Vd 1 ; D 2 One end of the power battery pack is connected with an anti - reverse charge diode Vd 2 ; D 3 One end of the power battery pack is connected with an anti - reverse charge diode Vd 3 .

4. The range extender system and method for a new energy motor vehicle according to claims 1 and 2, It is characterized in that The small power generator G only serves D in the power battery pack 1 Power battery pack, D 2 Power battery pack, D 3 Charge a group of power batteries in the power battery pack; the output powers of the small power internal combustion engine and the small power generator G are preferably one-half to one-third of the known powers of the internal combustion engine and the generator at present.

5. The range extender system and method for a new energy motor vehicle according to claims 1 and 2, It is characterized in that The described in-vehicle home intelligent charger mainly consists of two parts: a rectifier circuit and an intelligent control circuit. The intelligent control circuit has the functions of identifying the terminal voltage of the power battery pack and preventing overcharging. The AC input power and DC output power of the in-vehicle home intelligent charger are preferably one-half to one-third of the power of the currently well-known in-vehicle home charger. When the in-vehicle home intelligent charger is working, it intelligently selects a set of the lowest terminal voltage for charging from the power battery packs until each group is charged to the set optimal full charge voltage value. 1 Power battery packs, D 2 Power battery packs, D 3 Power battery packs to select a set of the lowest terminal voltage for charging until each group is charged to the set optimal full charge voltage value.

6. The range extender system and method for a new energy motor vehicle according to claims 1 and 2, It is characterized in that The described in-vehicle charging pile intelligent controller connects the D in the power battery pack 1 power battery packs, D 2 power battery packs, D 3 power battery packs in parallel, enabling the charging pile to charge three power battery packs simultaneously to the set optimal full charge voltage value.

7. The range extender system and method for a new energy motor vehicle according to claim 2, It is characterized in that The range-extending charging changeover switch K 1 and the power supply changeover switch K 2 are interlocked and normally open electronic switches. The range-extending charging changeover switch K 1 is provided with three switching positions I, II, and III. When in position I, terminal d is closed (at this time K 2 interlocks and terminal c is opened), connecting the D 1 power battery pack to the small power generator G, and the power generated is only used to charge the D 1 power battery pack; when in position II, terminal e is closed (at this time K 2 interlocks and terminal b is opened), connecting the D 2 power battery pack to the small power generator G, and the power generated is only used to charge the D 2 power battery pack; when in position III, terminal f is closed (at this time K 2 interlocks and terminal a is opened), connecting the D 3 power battery pack to the small power generator G, and the power generated is only used to charge the D 3 power battery pack.

8. The range extender system and method for a new energy motor vehicle according to claim 2, It is characterized in that The power supply conversion switch K described above 2 Sets three switching gears, namely I, II, and III. In gear I, the c terminal is closed, and the motor M is connected to the D 1 power battery pack via the vehicle driving controller. The D 1 power battery pack supplies power to the motor M, enabling the motor M to drive the wheels to rotate or assist the D 3 power battery pack for vehicle starting and climbing; In gear II, the b terminal is closed, and the motor M is connected to the D 2 power battery pack via the vehicle driving controller. The D 2 power battery pack supplies power to the motor M, enabling the motor M to drive the wheels to rotate or assist the D 1 power battery pack for vehicle starting and climbing; In gear III, the a terminal is closed, and the motor M is connected to the D 3 power battery pack via the vehicle driving controller. The D 3 power battery pack supplies power to the motor M, enabling the motor M to drive the wheels to rotate or assist the D 2 power battery pack for vehicle starting and climbing.

9. The range extender system and method for a new energy motor vehicle according to claims 1 and 2, It is characterized in that The power battery pack can also be configured into more than three power battery groups according to the power of the new energy motor vehicle.

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