Background technology
Power drive on the present hybrid vehicle mainly contains: 1. continuously variable automatic transmission (CVT), 2. automatic machincal transmission (AMT), 3. hydraulic automatic speed variator (AT), 4. mechanical type manual speed-changer (MT), 5. planetary gear type power distribution device.
And above-mentioned driving device all has the shortcoming of himself.Scheme 1. driving efficiency is low, and the torque transmitted finite capacity costs an arm and a leg.Scheme 2. volume is big, can't realize power shfit, and shift quality is poor.Scheme 3. driving efficiency is low, costs an arm and a leg, and is not inconsistent with the fuel-economizing target of hybrid power.4. scheme can't realize power shfit, can not realize autoshift, is a kind of hybrid transmissions of minimum grade.Scheme is 5. simple and practical, but speed ratio can not change, and in fact not is change-speed box, and the change of the speed of a motor vehicle does not realize that by it driving engine and motor are had very high requirement.
And double-clutch automatic transmission (Double Clutch Transmission, be called for short DCT) have self distinctive character as a kind of brand new product, be other change speed gear box do not have, the advantage that it has AT and AMT concurrently, the scantling of structure of its change speed gear box is compact more.
Summary of the invention
The objective of the invention is to DCT gearbox designs with the advanced person is applied in the Power train in the hybrid vehicle, and a kind of power drive of hybrid vehicle is provided, the driving efficiency that exists with the power drive that overcomes present hybrid vehicle is lower, the bulky shortcoming of integral structure.
The power drive of hybrid vehicle of the present invention, comprise driving engine, electrical motor, the electrical generator that is connected with engine output shaft, with joining power-transfer clutch of autonomous cruise speed system and DCT formula change speed gear box with two concentric sleeve type power input shafts, by current inverter respectively with electrical generator and electric electromechanics bonded assembly storage battery, it is characterized in that, described power-transfer clutch is to be provided with the three covers clutch pair of control respectively in a housing, the rotating plate of this three covers clutch pair is packed on the housing inner chamber, wherein the driven disc of the first cover clutch pair drives with an input shaft of described change speed gear box by feather key and is connected, the driven disc of the second cover clutch pair drives with another input shaft of described change speed gear box by feather key and is connected, and the driven disc of the 3rd cover clutch pair drives with the output shaft of described driving engine and is connected; The housing of power-transfer clutch is connected with the rotor shaft driving of electrical motor by the center shaft that is installed on housing one side.
The present invention is the principle of work according to DCT and hybrid power system, the hybrid vehicle power drive of a kind of brand new three-clutch formula structure of formation.Can significantly reduce the requirement of hybrid power system to driving engine and electrical motor.The power drive of hybrid vehicle of the present invention is compared with present hybrid vehicle, has the following advantages:
1. because this cover driving device is mechanical drive fully, the driving efficiency height, torque capacity is big, cost is low, so have the highest driving efficiency, meets the fuel-economizing target of hybrid power system fully.
2. can realize power shfit, autoshift, shift quality is good, and driving engine and electrical motor can make full use of the speed ratio of change-speed box.
3. can significantly reduce the requirement of hybrid power system to driving engine and motor.
The specific embodiment
With reference to Fig. 1, Fig. 2, a kind of power drive of hybrid vehicle, comprise driving engine 21, electrical motor 19, the electrical generator 20 that is connected with engine output shaft by gear 18, with the joining power-transfer clutch of autonomous cruise speed system 1 with have two concentric sleeve type power input shafts 6,17 DCT formula change speed gear box, the storage battery 15 that is electrically connected with electrical generator 20 and electrical motor 19 respectively by current inverter 16, it is characterized in that, power-transfer clutch 1 is to be provided with the three covers clutch pair of control respectively in a housing C7, the rotating plate C4 of this three covers clutch pair, C5, C6 is packed on the housing C7 inner chamber, wherein the driven disc C1 of the first cover clutch pair drives with an input shaft 17 of described change speed gear box by feather key and is connected, the driven disc C2 of the second cover clutch pair drives with another input shaft 6 of described change speed gear box by feather key and is connected, and the driven disc C3 of the 3rd cover clutch pair drives with the output shaft 22 of described driving engine 21 and is connected; The housing C7 of power-transfer clutch 1 is connected with the rotor shaft driving of electrical motor 19 by the center shaft C8 that is installed on housing C7 one side.
Two concentric sleeve type power input shafts the 6, the 17th of described DCT formula change speed gear box pass and are connected with described two driven disc C2, C1 respectively from the rotor internal cavity of electrical motor 19 hollows.
Driving gear 2 on the input shaft 6 of described change speed gear box 1 is meshed with third gear ring gear 5 and one grade of ring gear 14 on being separately positioned on two tween drive shafts of change speed gear box 7,12; Driving gear 3 on another input shaft 17 of described change speed gear box is meshed with fourth gear ring gear 4 and second gear ring gear 13 on being separately positioned on two tween drive shafts of change speed gear box 7,12.
Center shaft C8 on described clutch-bell cover C7 one side is one recessed to housing C7 inner chamber, as can be placed on described change speed gear box input shaft 17 outsides hollow shaft.
Shown in Fig. 19 is the output shaft of change speed gear box, and 10 is output shaft gear, and 8 and 11 are two tween drive shaft output gears being meshed with output shaft gear 10 respectively, and S1, S2, S3, S4 are respectively one grade, the synchro of second gear, third gear, fourth gear ring gear.
The principle of work of power drive of the present invention is:
(1) starter motor start the engine operating mode
When the needs engine operation, control system is sent control signal, discharges electric energy by storage battery 15 and drives starter motor 20 start the engines 21.
(2) electrical motor starting operating mode
Send control signal by control system during starting, at this moment first clutch (being the first cover clutch pair of described power-transfer clutch 1) and three-clutch (being the 3rd cover clutch pair of described power-transfer clutch 1) are in released state, power-transfer clutch is by storage battery 15 driving motors 19, electrical motor 19 passes to first input shaft 6 by second clutch (being the second cover clutch pair of described power-transfer clutch 1) with power, input shaft 6 is by one, third speed drive gear 2 passes to one grade of ring gear 14 with power, one grade of ring gear 14 passes to tween drive shaft 12 by synchro S1 with power, tween drive shaft 12 passes to takeoff output shaft gear 10 to power, and then power passed to power take-off shaft 9, to diff, vehicle start.The 3rd cover clutch pair is separated in the starting-up process, and power is provided by electrical motor 19 fully.
(3) pure motor drive mode
When the speed of a motor vehicle than underload hour, provide power by electrical motor 19 fully.At this moment three-clutch separates, storage battery 15 driving motors 19, and at this moment control system is selected suitable gear as required, if hang the odd number retaining, the second clutch closure, electrical motor 19 passes to wheel by second clutch with power; If hang the even number retaining, the first clutch closure, electrical motor 19 passes to wheel by first clutch with power.When the SOC of storage battery 15 value was lower than limit value, driving engine 21 started, and was storage battery 15 chargings.
(4) pure engine drive pattern
When the speed of a motor vehicle is higher, driving engine has very high efficient, at this moment power is provided by driving engine 21 fully, electrical motor 19 idle running, the 3rd clutch is secondary closed, at this moment just the same with general-utility car, select suitable gear by control system according to actual conditions, if hang the odd number retaining, the second clutch closure, driving engine 21 passes to wheel by second clutch with power; If hang the even number retaining, the first clutch closure, driving engine 21 passes to wheel by first clutch with power.When the SOC of storage battery 15 value was lower than limit value, driving engine 21 also will be battery charge.
(5) combination drive pattern
When brish acceleration and upward slope, load sharply increases, at this moment need driving engine 21 and electrical motor 19 to unite power is provided, at this moment the 3rd clutch is secondary closed, storage battery 15 driving motors 19, and the power of driving engine 21 and electrical motor 19 is compound by three-clutch, select suitable gear by control system according to actual conditions, the gear of working as required, closed first clutch or second clutch pass to wheel to the power after compound.When the SOC of storage battery 15 value was lower than limit value, driving engine 21 also will be battery charge.
(6) braking energy take-back model
When automobile brake, electrical motor 19 is transformed into generator mode, at this moment first clutch and second clutch have at least one to be to be in bonding state, and braking energy passes to electrical generator 19 by driving device, and it is storage battery 15 chargings that electrical generator 19 changes into electric energy with braking energy.