CN102874095B - A kind of range extended electric vehicle power system - Google Patents
A kind of range extended electric vehicle power system Download PDFInfo
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- CN102874095B CN102874095B CN201210346092.XA CN201210346092A CN102874095B CN 102874095 B CN102874095 B CN 102874095B CN 201210346092 A CN201210346092 A CN 201210346092A CN 102874095 B CN102874095 B CN 102874095B
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Abstract
The present invention relates to a kind of range extended electric vehicle power system, mainly comprise combustion engine, the first electrical motor, the second electrical motor, dual clutch transmission and a set of change gear mechanism.The bent axle of combustion engine is connected with the housing of dual clutch transmission.The first clutch of dual clutch transmission is connected with the first transmission gear by transmission shaft, and second clutch is connected with the first motor rotor.Second motor rotor is connected with the second transmission gear.By controlling the combination of dual clutch transmission first clutch and second clutch or being separated, the switching of range extended electric vehicle power system series and parallel connections operational mode can be realized.Form change gear mechanism by the first transmission gear and the second transmission gear, the Driving Torque of the second electrical motor can be increased.
Description
Technical field
The present invention relates to a kind of stroke-increasing electric automobile, particularly there are combustion engine and two electrical motors and the range extended electric vehicle power system of combustion engine and electrical motor parallel drive can be carried out.
Background technology
Become today of China Automobile Industry theme at energy saving standard, hybrid vehicle has become the object of automobile vendor of various countries primary study.Hybrid vehicle (HybridElectricalVehicle is called for short HEV) refers to the automobile simultaneously equipping two kinds of power resources-heat dynamic resources (being produced by traditional spark ignition engine or diesel engine) and electrodynamic source (electrokinetic cell and electrical motor).Hybrid vehicle does not need external charge; take driving engine as the electronlmobil of main power source; by hybrid power functions such as engine idle shutdown, Brake energy recovery, low speed pure motor driving, driving generating, driving power-assisted and driving engine drive separately; make driving engine can according to the actual operating mode flexible modulation of car load; work in the region remaining on Combination property the best, thus reduce oil consumption and discharge.
Compared with hybrid vehicle, pure electric automobile (BatteryElectricvehicle is called for short BEV) relies on electric motor car completely, and its energy source, from electrical network, achieves zero-emission, and efficiency is high, and noise is little.But limit by current driving force battery technology level, its energy density can't meet automobile-used demand, and car load continual mileage is limited, the requirement of user's routine use can not be met.
In order to extend the continual mileage of pure electric automobile, people add a high efficiency internal combustion engine in power system of electric automobile, and when electrokinetic cell voltage reduces, it can drive power electric generators, reaches the object of extending driving range with this.This kind of battery-driven car is called as stroke-increasing electric automobile (Range-extendedElectricVehicle is called for short REEV).According to power system architecture, the stroke-increasing electric automobile existed at present can be divided into series connection stroke boosting electronlmobil and series-parallel connection stroke-increasing electric automobile.It is comparatively large that series connection stroke boosting electronlmobil increases advantage in (comparing with traditional vehicle) at cost, and namely traditional vehicle cost is higher, and under electric quantity maintaining stage, dynamic property is difficult to meet vehicle performance requirement, and fuel economy of running at high speed is also poor.Series-parallel connection stroke-increasing electric automobile dynamic property and oil consumption under electric quantity maintaining stage are all better than series connection stroke boosting electronlmobil, but power system is complicated, cost is higher;
(1) because the combustion engine of traditional vehicle (or hybrid vehicle) needs to be operated in bottom gear with full
Foot accelerates demand, and the low and load of its rate of load condensate and rotation speed change soon, affect car load economy;
(2) in existing hybrid power configuration, motor is mainly used to the work area regulating combustion engine, thus make combustion engine as far as possible in the work of Optimum Economic interval, the power driving vehicle to need still provides primarily of combustion engine, therefore the power of combustion engine is very large, affects car load economy and emission performance;
(3) in existing hybrid power configuration, first motorjbrm generally has two kinds, and ISG (IntegratedStarterGenerator) BSG(BeltStarterGenerator), they are directly connected with combustion engine usually, can them be driven to rotate during internal combustion engine always, this not only can produce mechanical friction loss, also can produce electromagnetism loss, affect car load economy;
(4) although pure electric automobile can realize zero consumption of fuel and zero-emission, due to the volume of electrokinetic cell and the restriction of energy density, its continual mileage is very limited;
(5) series connection stroke boosting electronlmobil, under increasing journey pattern, there is energy secondary conversion loss, fuel economy is low.
Summary of the invention
The object of the present invention is to provide a kind of range extended electric vehicle power system, it adopts the second electrical motor of the combustion engine of a miniwatt grade and a high-power grade.Prevent drive first electrical motor from rotating when internal combustion engine drive, the friction and the electromagnetism that decrease the first electrical motor lose.By change gear mechanism for the second electrical motor provides a larger speed ratio, give full play to motor by the high-performance feature of realization of High Speed, car load dynamic property demand is met by the second electrical motor, reduce the power of combustion engine, improve the rate of load condensate of combustion engine, improve car load fuel consumption and emission.When electrokinetic cell electricity is not enough, tandem drive vehicle during low speed, by internal combustion engine drive first electrical motor to power battery charging, maintains electric quantity balancing; Parallel drive vehicle during high speed, energy transfer efficiency is high, on the basis ensureing power performance, extends the continual mileage of vehicle further.
Technical scheme of the present invention is achieved in that a kind of range extended electric vehicle power system, be made up of combustion engine, the first electrical motor, the second electrical motor, dual clutch transmission and a set of change gear mechanism, wherein change gear mechanism is made up of the first transmission gear and the second transmission gear; It is characterized in that: the bent axle of combustion engine is connected with the housing of dual clutch transmission, the first clutch of dual clutch transmission is connected with the first transmission gear by transmission shaft, second clutch is connected with the first motor rotor, second motor rotor is connected with the second transmission gear, increased the torque of the second electrical motor by change gear mechanism, maximum climbable gradient of vehicle requirement can be met.
Described combustion engine is used for meeting the demand of driving power that vehicle high-speed at the uniform velocity travels and electrical accessory consumed power.
The power of the first described electrical motor is used for starting combustion engine, and meets electrokinetic cell SOC balance and electrical accessory electrical energy demands.
The second described motor power (output) is determined by car load dynamic property, increases torque by change gear mechanism, and the second electrical motor can meet max. climb slope requirement.
Described combustion engine is by the first transmission gear outputting power, and the second electrical motor is by change gear mechanism outputting power.
Described first clutch combines, and carries out transmission of power between combustion engine and the second electrical motor, and first clutch is separated, and between combustion engine and the second electrical motor, transmission of power disconnects; Described second clutch combines, carry out transmission of power between combustion engine and the first electrical motor, second clutch is separated, and between combustion engine and the first electrical motor, transmission of power disconnects, also can cancel second clutch, the first electrical motor becomes to be rigidly connected with the housing of dual clutch transmission.
Described power system comprises following mode of operation:
A) when starting combustion engine, first clutch is separated, and second clutch combines, by the first motor starting combustion engine;
B) when vehicle start, be separated first clutch, disconnect transmission of power between combustion engine and the second electrical motor, the independent forward drive of the second electrical motor;
C) low vehicle speeds or the efficiency of internal combustion engine lower time, first clutch be separated, the second electrical motor drives vehicle separately.According to electrokinetic cell dump energy, in conjunction with second clutch, can be generated electricity by internal combustion engine drive first electrical motor, realize power system with series model work;
D) when vehicle suddenly gives it the gun, first clutch combines, and second clutch is separated, and combustion engine and the second electrical motor drive vehicle simultaneously, and power system is with paralleling model work;
E) when vehicle at the uniform velocity travels and the efficiency of internal combustion engine is higher, first clutch combines, by IC engine-powered vehicles.According to electrokinetic cell dump energy: in conjunction with second clutch, can be generated electricity by internal combustion engine drive first electrical motor, realize electrokinetic cell energy equilibrium; Also separable second clutch, the first motor stall, the friction and the electromagnetism that reduce by the first electrical motor lose;
F) car retardation travel or when braking, first clutch is separated with second clutch, disconnection combustion engine and the second electrical motor between transmission of power, the second electrical motor is to power battery charging;
G) when vehicle backing travels, first clutch is separated with second clutch, and disconnect transmission of power between combustion engine and the second electrical motor, the second electrical motor works independently, and contrarotation drives vehicle.
Described combustion engine, dual clutch transmission and the first electrical motor can be cancelled, and power system works always and is a kind of pure electric vehicle power system under electric-only mode.
Good effect of the present invention adopts change gear mechanism, reduces vehicle to the second motor torque demand, reduce the second electrical motor volume; First electrical motor, the second electrical motor, change gear mechanism Integration Design, make system architecture compacter, realizes the lightweight of power system; Compare same level hybrid vehicle, power of IC engine is little, improves the rate of load condensate of combustion engine when vehicle travels; When the second clutch of dual clutch transmission is separated, prevent from during internal combustion engine drive, driving the first electrical motor to rotate, decrease loss due to friction and the electromagnetism loss of the first electrical motor, thus improve the fuel economy of car load; When cancelling second clutch, power system architecture is compacter, can reduce integral vehicle cost.During low vehicle speeds, power system can be pure electronic or series model work; During high vehicle speeds, power system can be electric-only mode work, also can in conjunction with first clutch, driving engine is made to participate in vehicular drive, now power system energy transfer efficiency is high, on the basis ensureing car load dynamic property, can extend the continual mileage of vehicle further.Based on power system of the present invention, combustion engine, dual clutch transmission and the first electrical motor can be cancelled, power system works always under electric-only mode, the present invention develops into a kind of pure electric vehicle power system, can realize the dynamical system altogether platform of stroke-increasing electric automobile and pure electric automobile.
Accompanying drawing explanation
Figure 1 shows that the structural representation of range extended electric vehicle power system.
Figure 2 shows that two kinds of working stages of power system.Wherein SOC is the state-of-charge of electrokinetic cell.SOC is high, illustrates that electrokinetic cell electricity is sufficient; SOC is low, illustrates that electrokinetic cell electricity is not enough.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described: as shown in Figure 1, and this range extended electric vehicle power system possesses: combustion engine 1, dual clutch transmission housing 2, first clutch 3, second clutch 4, dual clutch transmission 5, the first motor stator 6, first motor rotor 7, second transmission gear 8, second motor stator 9, second motor rotor 10, first transmission gear 11, power output gear 12.
The bent axle of combustion engine 1 is connected with the housing 2 of dual clutch transmission.The first clutch 3 of dual clutch transmission is connected with the first transmission gear 11 by transmission shaft 13, and second clutch 4 is connected with the first motor rotor 7.Second motor rotor 10 is connected with the second transmission gear 8.
Second clutch 4 combines, and carries out transmission of power between combustion engine 1 and the first motor rotor 7.Second clutch 4 is separated, and between combustion engine 1 and the first motor rotor 7, transmission of power disconnects.
First clutch 3 combines, and carries out transmission of power between combustion engine 1 and the second motor rotor 10.First clutch 3 is separated, and between combustion engine 1 and the second motor rotor 10, transmission of power disconnects.
According to power battery charged state SOC, power system has two working stages: electric quantity consumption CD stage and electricity maintain the CS stage.When electrokinetic cell electricity is sufficient, system works is in the CD stage, and when electrokinetic cell electricity is reduced to a certain degree, system enters into the CS stage.Under the CD stage, power system has following several mode of operation: low speed electric-only mode, high speed electric-only mode, the independent drive pattern of high-speed internal combustion engine and high-speed joint drive pattern.Under the CS stage, power system has following several mode of operation: low speed series model, high speed traveling power generation mode, the independent drive pattern of high-speed internal combustion engine and high-speed joint drive pattern.
Under electric-only mode, combustion engine 1 quits work, and first clutch 3 is separated, the first motor stall, and the second electrical motor drives separately vehicle to travel.
Under series model, combustion engine 1 works, and first clutch 3 is separated, and second clutch 4 combines, and the first electrical motor generating, the second electrical motor drives separately vehicle to travel.
[under driving power generation mode, combustion engine 1 works, and first clutch 3 combines, and second clutch 4 combines, and the first electrical motor generating, the second electrical motor is with turning, and combustion engine 1 drives vehicle to travel.
Under the independent drive pattern of combustion engine, combustion engine 1 works, and first clutch 3 combines, and second clutch 4 is separated, the first motor stall, and the second electrical motor is with turning, and combustion engine 1 drives vehicle to travel.
Under associating drive pattern, combustion engine 1 works, and first clutch 3 combines, and second clutch 4 is separated, the first motor stall, and the second electrical motor and combustion engine 1 are combined driving vehicle and travelled.As shown in the table:
In the concrete driving process of vehicle, the mode of operation of this power system is specific as follows:
A) when starting combustion engine 1, first clutch 3 is separated, and second clutch 4 combines, by the first motor starting combustion engine 1;
B) when vehicle start, be separated first clutch 3, disconnect transmission of power between combustion engine 1 and the second electrical motor, the independent forward drive of the second electrical motor;
C) low vehicle speeds or combustion engine 1 efficiency lower time, first clutch 3 is separated, and the second electrical motor drives vehicle separately.According to electrokinetic cell dump energy, in conjunction with second clutch 4, the first electrical motor can be driven to generate electricity by combustion engine 1, realizes power system with series model work;
D) when vehicle suddenly gives it the gun, first clutch 3 combines, and second clutch 4 is separated, and combustion engine 1 and the second electrical motor drive vehicle simultaneously, and power system is with paralleling model work;
E) when vehicle at the uniform velocity travels and combustion engine 1 efficiency is higher, first clutch 3 combines, and drives vehicle by combustion engine 1.According to electrokinetic cell dump energy: in conjunction with second clutch 4, the first electrical motor can be driven to generate electricity by combustion engine 1, realize electrokinetic cell energy equilibrium; Also separable second clutch 4, first motor stall, the friction and the electromagnetism that reduce by the first electrical motor lose;
F) to travel or when braking, first clutch 3 is separated with second clutch 4 at car retardation, disconnect transmission of power between combustion engine 1 and the second electrical motor.Wheel drives the second electrical motor to power battery charging by driving device;
G) when vehicle backing travels, first clutch 3 is separated with second clutch 4, and disconnect transmission of power between combustion engine 1 and the second electrical motor, the second electrical motor works independently, and contrarotation drives vehicle.
Claims (2)
1.
a kind of range extended electric vehicle power system, be made up of combustion engine, the first electrical motor, the second electrical motor, dual clutch transmission and a set of change gear mechanism, wherein change gear mechanism is made up of the first transmission gear and the second transmission gear; It is characterized in that: the bent axle of combustion engine is connected with the housing of dual clutch transmission, the first clutch of dual clutch transmission is connected with the first transmission gear by transmission shaft, second clutch is connected with the first motor rotor, second motor rotor is connected with the second transmission gear, described combustion engine is used for meeting the demand of driving power that vehicle high-speed at the uniform velocity travels and electrical accessory consumed power, the second described motor power (output) is determined by car load dynamic property, increase torque by change gear mechanism, meet max. climb slope requirement.
2. range extended electric vehicle power system according to claim 1, it is characterized in that described combustion engine, dual clutch transmission and the first electrical motor can be cancelled, power system works always and is a kind of pure electric vehicle power system under electric-only mode.
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| CN201210346092.XA CN102874095B (en) | 2012-09-18 | 2012-09-18 | A kind of range extended electric vehicle power system |
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| CN201210346092.XA CN102874095B (en) | 2012-09-18 | 2012-09-18 | A kind of range extended electric vehicle power system |
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| CN102874095B true CN102874095B (en) | 2016-04-20 |
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| CN111516482A (en) * | 2020-02-24 | 2020-08-11 | 绿传(北京)汽车科技股份有限公司 | Power coupling transmission device, hybrid vehicle and operation method of hybrid vehicle |
| CN112895875A (en) * | 2021-03-12 | 2021-06-04 | 南京巨基汽车电子有限公司 | Range-extending series-parallel hybrid power self-adaptive control system and method |
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| CN101204920A (en) * | 2006-12-19 | 2008-06-25 | 比亚迪股份有限公司 | Mixed motor vehicle driving system |
| CN201291756Y (en) * | 2008-08-28 | 2009-08-19 | 比亚迪股份有限公司 | Hybrid power drive system |
| CN202283871U (en) * | 2011-09-30 | 2012-06-27 | 比亚迪股份有限公司 | Hybrid power system and vehicle having the same |
| CN203032365U (en) * | 2012-09-18 | 2013-07-03 | 中国第一汽车股份有限公司 | Range-extending type electric vehicle power system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3099570B2 (en) * | 1993-02-15 | 2000-10-16 | トヨタ自動車株式会社 | Engine driven generator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204920A (en) * | 2006-12-19 | 2008-06-25 | 比亚迪股份有限公司 | Mixed motor vehicle driving system |
| CN201291756Y (en) * | 2008-08-28 | 2009-08-19 | 比亚迪股份有限公司 | Hybrid power drive system |
| CN202283871U (en) * | 2011-09-30 | 2012-06-27 | 比亚迪股份有限公司 | Hybrid power system and vehicle having the same |
| CN203032365U (en) * | 2012-09-18 | 2013-07-03 | 中国第一汽车股份有限公司 | Range-extending type electric vehicle power system |
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