CN101659204B - Hybrid driving system and driving method thereof - Google Patents

Hybrid driving system and driving method thereof Download PDF

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Publication number
CN101659204B
CN101659204B CN200810142165.7A CN200810142165A CN101659204B CN 101659204 B CN101659204 B CN 101659204B CN 200810142165 A CN200810142165 A CN 200810142165A CN 101659204 B CN101659204 B CN 101659204B
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motor
clutch
drive
closed
center
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CN101659204A (en
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任毅
杨胜麟
王涛
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BYD Co Ltd
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BYD Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/62Hybrid vehicles

Abstract

The invention discloses a hybrid driving system and a driving method thereof. The driving system comprises an engine, a first clutch, a first motor, a second motor, a second clutch, a third clutch, an energy storage device and a retarding mechanism, wherein the engine is connected with the retarding mechanism through the first clutch; the energy storage device is electrically connected with the first and second motors respectively; the second motor is connected with the retarding mechanism; the engine is connected with the first motor through the second clutch; and the first motor is connected with the retarding mechanism through the third clutch. The driving method comprises the step of: controlling the driving system to be under a purely electric working condition, a series working condition, a series-parallel working condition, a three-power-source working condition or an engine working condition according to the required power of the driving system and the energy storage status of the energy storage device. The driving system provided by the invention is simple in structure, while the driving method primarily utilizes the motors to execute driving and can flexibly control the driving system to be in various operating modes so as to meet the requirements of actual running.

Description

A kind of hybrid electric drive system and driving method thereof
Technical field
The present invention relates to a kind of hybrid electric drive system and driving method thereof.
Background technology
At present, because hybrid vehicle shows excellence in energy-conserving and environment-protective, the developing direction of auto trade is therefore become gradually.A kind of hybrid electric drive system is disclosed in CN1118387C, as shown in Figure 1, it reducing gear 6 comprising driving engine 1, the electrical generator 3 be connected with the output shaft 2 of driving engine 1, the battery 4 for storing the electric power produced by electrical generator 3, the electrical motor 5 driven by battery 4, the Poewr transmission mechanism 11 be connected with the output shaft 2 of driving engine 1 and be connected with electrical motor 5 and Poewr transmission mechanism 11, the output of described reducing gear 6 passes to wheel the most at last.
The driving method of above-mentioned drive system is, in normal vehicle operation process, driving engine 1 drives electrical generator 3, power is inputted reducing gear 6 by electrical motor 5, and is finally delivered to wheel.When vehicle is in emergency circumstances, as electrical motor 5 damage time, the output of driving engine 1 directly inputs reducing gear 6 through Poewr transmission mechanism 11, and is finally delivered to wheel.
But, in above-mentioned this drive system, on the one hand, for by Poewr transmission mechanism 11 complex structure of the transmission of power of driving engine 1 to reducing gear 6, not only comprise power-transfer clutch, also comprise torque converter and another reducing gear, therefore cause whole drive system complex structure, this makes troubles not only to the entire arrangement of system, but also tare is increased; On the other hand, together with driving engine 1 is connected directly between with electrical generator 3, can dallies by drive electrical generators 3 while driving engine 1 drives wheel separately, therefore can produce certain degradation of energy.In addition, the drive pattern of this drive system is single, and effective utility of laser power is low, can not meet the power demand of various complex working condition during vehicle actual travel.
Summary of the invention
The object of this invention is to provide a kind of hybrid electric drive system, this driving system structure is simple, and has multiple-working mode.
Hybrid electric drive system according to the present invention comprises: driving engine, first clutch, the first motor, the second motor, second clutch, the 3rd power-transfer clutch, closed-center system and speed reduction gearing, described driving engine is connected with speed reduction gearing by first clutch, described closed-center system is electrically connected respectively with the first motor and the second motor, described second motor is connected with speed reduction gearing, driving engine is connected with the first motor by second clutch, and described first motor is connected with speed reduction gearing by the 3rd power-transfer clutch.
Another object of the present invention is to provide a kind of driving method of hybrid electric drive system, and this driving method can have multiple-working mode by control-driven system.
According to the driving method of hybrid electric drive system of the present invention, wherein said drive system comprises: driving engine, first clutch, first motor, second motor, second clutch, 3rd power-transfer clutch, closed-center system, and speed reduction gearing, described driving engine is connected with speed reduction gearing by first clutch, described closed-center system is electrically connected respectively with the first motor and the second motor, described second motor is connected with speed reduction gearing, driving engine is connected with the first motor by second clutch, described first motor is connected with speed reduction gearing by the 3rd power-transfer clutch, described driving method comprises: according to the demand power of described drive system and the energy storage state of closed-center system, control described drive system and be in pure electronic operating mode, series connection operating mode, series-parallel connection operating mode, three propulsion source operating modes, or engine operating condition.
Hybrid electric drive system structure provided by the invention is simple, and the driving method of this drive system can be in multiple-working mode according to the next flexible control-driven system of energy storage situation of the demand power of drive system and closed-center system, simultaneously, second clutch can be controlled when not needing the first machine operation and be in released state, improve and can expect degree of utilization; And the method can make hybrid electric drive system play the usefulness of self well, the utilization to energy maximal efficiency is realized while satisfying the demands power, driving engine is avoided to be in the operating mode of idling or low-speed running, thus reach the object improving fuel utilization ratio, reduce exhaust emissions, finally realize the anti-emission carburetor of car load, low oil consumption and kinetic energy.Supplementary features of the present invention and corresponding advantage detailed description of the invention part are below described in detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of hybrid electric drive system disclosed in CN1118387C;
Fig. 2 is the block schematic of hybrid electric drive system provided by the invention;
Fig. 3 is the principle sketch of the preferred implementation of hybrid electric drive system provided by the invention;
The energy transferring distance base diagram of hybrid electric drive system under pure electronic operating mode that Fig. 4 provides for one embodiment of the present invention;
The energy transferring distance base diagram of hybrid electric drive system under series connection operating mode that Fig. 5 provides for one embodiment of the present invention;
The energy transferring distance base diagram of hybrid electric drive system under engine operating condition that Fig. 6 provides for one embodiment of the present invention.
The energy transferring distance base diagram of hybrid electric drive system under operating mode in parallel that Fig. 7 provides for one embodiment of the present invention;
The energy transferring distance base diagram of hybrid electric drive system under series-parallel connection operating mode that Fig. 8 provides for one embodiment of the present invention;
The energy transferring distance base diagram of hybrid electric drive system under three propulsion source operating modes that Fig. 9 provides for one embodiment of the present invention;
Detailed description of the invention
Below, will by reference to the accompanying drawings, the specific embodiment of the present invention is described in detail.
As shown in Figures 2 and 3, hybrid electric drive system provided by the invention comprises: driving engine 100, first clutch 200, first motor 300, second motor 400, closed-center system 500, and speed reduction gearing 600, described driving engine 100 is connected with speed reduction gearing 600 by power-transfer clutch 200, described closed-center system 500 is electrically connected respectively with the first motor 300 and the second motor 400, described second motor 400 is connected with speed reduction gearing 600, described hybrid electric drive system also comprises second clutch 800 and the 3rd power-transfer clutch 700, described driving engine 100 is connected by second clutch 800 with the first motor 300, described first motor 300 is connected by the 3rd power-transfer clutch 700 with speed reduction gearing 600.
Wherein, described driving engine 100 can be spark ignition engine, diesel engine or other engine fuel such as methyl alcohol, ethanol etc.Described driving engine 100 is connected with speed reduction gearing 600 by first clutch 200, thus when first clutch 200 is in engagement state, when driving engine 100 works, the power of driving engine 100 can be delivered to speed reduction gearing 600 by first clutch 200.Therefore when driving engine 100 works, first clutch 200 engages, and second clutch 800 is separated, then the energy of driving engine is delivered to wheel by speed reduction gearing 600.
Described first motor 300 can be AC alternating current dynamo, switched reluctance machines, direct current permanent magnet motor etc.According to electromagnetic induction principle, described first motor 300 both can generator mode, also can motor mode, during with generator mode, for being electric energy by changes mechanical energy; During with motor mode, for being mechanical energy by electric energy conversion.Specifically, second clutch 800 combines, and when driving engine 100 works, driving engine 100 drives the first motor 300 with generator mode, with by the kinetic transformation of driving engine 100 for electric energy exports closed-center system 500 to.When closed-center system 500 is powered to the first motor 300, the first motor 300 with motor mode, with by electric energy conversion for kinetic energy exports driving engine 100 to, namely drive driving engine 100 work.
Described second motor 400 can be AC alternating current dynamo, switched reluctance machines, direct current permanent magnet motor etc.According to electromagnetic induction principle, described second motor 400 both can generator mode, also can motor mode, during with generator mode, for being electric energy by changes mechanical energy; During with motor mode, for being mechanical energy by electric energy conversion.Specifically, when to be transmitted the kinetic energy come by speed reduction gearing 600 and be passed to the second motor 400, the second motor 400 with generator mode, to export the kinetic transformation of speed reduction gearing 600 to closed-center system 500 for electric energy.When closed-center system 500 is powered to the second motor 400, the second motor 400 with motor mode, with by electric energy conversion for kinetic energy exports speed reduction gearing 600 to.
Described closed-center system 500 is controlled energy storing device, such as, can be battery pack, fuel cell unit etc.Described speed reduction gearing 600 can be reducing gear, change-speed box etc., and as known to those skilled in the art, the power being delivered to speed reduction gearing 600 finally can be delivered to wheel of vehicle by coupler, wheel drive shaft etc., travels to drive vehicle.
Hybrid electric drive system provided by the present invention, work at driving engine 100, driving engine 100 drives the first motor 300 with generator mode by second clutch 800, the first motor 300 is made to be electric energy by changes mechanical energy, but now closed-center system 500 energy storage is sufficient, when without the need to charging, second clutch 800 can be controlled be separated, cut off the energy that driving engine 100 is transmitted to the first motor 300, prevent driving engine 100 from driving the first motor 300 to continue to rotate and the degradation of energy that causes, also prevent the damage to closed-center system 500 inside that closed-center system 500 causes because of overcharge simultaneously.
Under preferable case, described closed-center system 500 has external charge interface (not shown), external power supply can be directly used to charge to described closed-center system 500 by this external charge interface, such as can directly use domestic power supply to charge to it, therefore substantially increase ease of use.
Under preferable case, hybrid electric drive system provided by the present invention also comprises detecting unit (not shown), described detecting unit is electrically connected with described closed-center system 500, for detecting the energy storage state of described closed-center system 500, namely for detecting the state-of-charge of described closed-center system 500.Such as can set as required: when described detecting unit detects that the state-of-charge of described closed-center system 500 is greater than 40%, represent that described closed-center system 500 energy storage is sufficient; When described detecting unit detects that the state-of-charge of described closed-center system 500 is less than or equal to 40% but is greater than 15%, represent that described closed-center system 500 is in the not enough state of energy storage; When described detecting unit detects that the state-of-charge of described closed-center system 500 is less than or equal to 15%, represent that described closed-center system 500 is in energy storage wretched insufficiency state.
Below, the driving method of hybrid electric drive system provided by the invention is described in detail.
The driving method of hybrid electric drive system provided by the invention mainly comprises: according to the demand power of described drive system and the energy storage state of closed-center system, controls described drive system and is in pure electronic operating mode, engine operating condition, series connection operating mode, operating mode in parallel, series-parallel connection operating mode or three propulsion source operating modes.
Wherein, 1) pure electronic operating mode
When described drive system is in pure electronic operating mode, driving engine 100 and the first motor 300 do not work, first clutch 200 is in released state, closed-center system 500 is in discharge regime, powered to the second motor 400 by closed-center system 500, second motor 400 with motor mode and output kinetic energy to speed reduction gearing 600, now the second motor 400 as propulsion source drive vehicle travel.3rd power-transfer clutch 700 is separated, and second clutch 800 is separated or engages.
Energy transferring path under pure electronic operating mode as shown in Figure 4 wherein arrow points be energy transferring direction), first electric energy transfers to the second motor 400 from closed-center system 500, through the Conversion of Energy of the second motor 400, electric energy is converted into kinetic energy, then the kinetic energy that the second motor 400 exports is transferred to speed reduction gearing 600, and finally transfers to wheel.
2) series connection operating mode
When described drive system is in series connection operating mode, second clutch 800 is in bonding state, driving engine 100 works and drives the first motor 300 with generator mode, thus closed-center system 500 is charged, first clutch 200 is in released state, powered to the second motor 400 by closed-center system 500, the second motor 400 with motor mode and output kinetic energy to speed reduction gearing 600, now the second motor 400 as propulsion source drive vehicle travel.3rd power-transfer clutch 700 is separated.
Energy transferring path under series connection operating mode as shown in Figure 5 (wherein arrow points is energy transferring direction), first in conjunction with second clutch 800, the kinetic energy that driving engine 100 produces is passed to closed-center system 500 after the first motor 300 is converted into electric energy, then the electric energy in closed-center system 500 is passed to speed reduction gearing 600 after the second motor 400 is converted into kinetic energy, and finally transfers to wheel.
3) engine operating condition
When described drive system is in engine operating condition, driving engine 100 works, first clutch 200 is in engagement state, second clutch and the 3rd power-transfer clutch are in released state, be passed to speed reduction gearing 600 with the kinetic energy exported by driving engine 100, now driving engine 100 drives vehicle to travel as propulsion source.
When the moment of torsion that driving engine 100 produces is greater than vehicle required torque, driving engine can drive the first motor 300 to charge for closed-center system 500.So in the case, start the engine 100, and make first clutch 200, second clutch 800 is in engagement state, speed reduction gearing 600 is delivered to a part of kinetic energy produced by driving engine 100 by first clutch 200, simultaneously due to when driving engine 100 is in running order, driving engine 100 can drive the first motor 300 by second clutch 800, another part kinetic energy that therefore driving engine 100 can be produced is delivered to the first motor 300, now the first motor 300 is with generator mode, to export the kinetic transformation transmitted by driving engine 100 to closed-center system 500 to charge to it for electric energy.
Energy transferring path under engine operating condition is (wherein arrow points is energy transferring direction) as shown in Figure 6, article one, energy transferring path is: the part kinetic energy that driving engine 100 produces is passed to after speed reduction gearing 600 through first clutch 200, and wherein a part finally transfers to wheel; Another energy transferring path is: another part kinetic energy that driving engine 100 produces is passed to closed-center system 500 after second clutch 800 is converted into electric energy by the first motor 300.
4) operating mode in parallel
When described drive system is in operating mode in parallel, driving engine 100 works, first clutch 200 is in engagement state, speed reduction gearing 600 is passed to the kinetic energy exported by driving engine 100, closed-center system 500 is powered to the second motor 400, second motor 400 with motor mode and output kinetic energy to speed reduction gearing 600, now driving engine 100 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.
Specifically, now, the kinetic energy exported due to the second motor 400 cannot meet vehicle driving requirements, driving engine 100 is needed to provide power-assisted for it, so start the engine 100, and make first clutch 200 be in engagement state, thus by first clutch 200, the kinetic energy that driving engine 100 exports can be delivered to speed reduction gearing 600.Meanwhile, the closed-center system 500 of electric energy abundance is in discharge regime, powering to the second motor 400, the second motor 400 with motor mode, to export for kinetic energy the electric energy conversion carried by closed-center system 500 to speed reduction gearing 600.The kinetic energy being delivered to speed reduction gearing 600 is the most all delivered to wheel, travels to drive vehicle.Now, because closed-center system 500 electric energy is sufficient, so without the need to charging to it, therefore second clutch 800 is in released state.3rd power-transfer clutch 700 is separated.
Energy transferring path under operating mode in parallel as shown in Figure 7 (wherein arrow points is energy transferring direction), article one, energy transferring path is: the kinetic energy that driving engine 100 produces is passed to speed reduction gearing 600 through first clutch 200, and finally transfers to wheel; Another energy transferring path is: the electric energy in closed-center system 500 is passed to speed reduction gearing 600 after the second motor 400 is converted into kinetic energy, and finally transfers to wheel.
5) series-parallel connection operating mode
Described driving method also comprises the described drive system of control and is in series-parallel connection operating mode, second clutch 800 combines, driving engine 100 works and drives the first motor 300 with generator mode by second clutch 800, thus closed-center system 500 is charged, first clutch 200 is in engagement state, speed reduction gearing 600 is passed to the kinetic energy exported by driving engine 100, powered to the second motor 400 by closed-center system 500 simultaneously, second motor 400 with motor mode and output kinetic energy to speed reduction gearing 600, now driving engine 100 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.3rd power-transfer clutch 700 is separated.
Specifically, now, on the one hand, the kinetic energy exported due to the second motor 400 cannot meet vehicle driving requirements, driving engine 100 is needed to provide power-assisted for it, so start the engine 100, and make first clutch 200 be in engagement state, thus by first clutch 200, the kinetic energy that driving engine 100 exports can be delivered to speed reduction gearing 600.Meanwhile, to be powered to the second motor 400 by closed-center system 500, the second motor 400 with motor mode, to export for kinetic energy the electric energy conversion carried by closed-center system 500 to speed reduction gearing 600.The kinetic energy being delivered to speed reduction gearing 600 is the most all delivered to wheel, travels to drive vehicle.On the other hand, because closed-center system 500 electric energy is not enough, need charging in time, to ensure to continue to travel, so when driving engine 100 is in running order, the first motor 300 can be driven by making in conjunction with second clutch 800 driving engine 100, so that the kinetic energy of driving engine 100 is delivered to the first motor 300, now the first motor 300 is with generator mode, to export the kinetic transformation of driving engine 100 to closed-center system 500 to charge to it for electric energy.
Energy transferring path under series-parallel connection operating mode is (wherein arrow points is energy transferring direction) as shown in Figure 8, article one, energy transferring path is: the part kinetic energy that driving engine 100 produces is passed to speed reduction gearing 600 through first clutch 200, and finally transfers to wheel; Another energy transferring path is: another part kinetic energy that driving engine 100 produces is passed to closed-center system 500 after second clutch 800 is converted into electric energy by the first motor 300; An energy transferring path is again: the electric energy in closed-center system 500 is passed to speed reduction gearing 600 after the second motor 400 is converted into kinetic energy, and finally transfers to wheel.
6) three propulsion source operating modes
When described drive system is in three propulsion source operating modes, driving engine 100 works, first clutch 200 is in engagement state, speed reduction gearing 600 is passed to the kinetic energy exported by driving engine 100, closed-center system 500 is powered to the first motor 300 and the second motor 400 simultaneously, 3rd power-transfer clutch 700 is in engagement state second motor 400, first motor 300 and the second motor 400 with motor mode and output kinetic energy to speed reduction gearing 600, now driving engine 100, first motor 300 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.Second clutch 800 is separated.
When vehicle is in extremely severe driving cycle, such as when the demand power of drive system is greater than the horsepower output sum of the horsepower output of the second motor 400 and driving engine, controls described drive system and be in three propulsion source operating modes.Under three propulsion source operating modes, driving engine 100, first motor 300 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.
Specifically, now, on the one hand, start the engine 100, makes first clutch 200 be in engagement state, the kinetic energy that driving engine 100 self produces is delivered to speed reduction gearing 600 by first clutch 200.On the other hand, powered to the first motor 300 by closed-center system 500, now the 3rd power-transfer clutch 700 is in bonding state, and the first motor 300, with motor mode, exports speed reduction gearing 600 for kinetic energy by the 3rd power-transfer clutch 700 with the electric energy conversion carried by closed-center system 500.Meanwhile, closed-center system 500 is also powered to the second motor 400, second motor 400 is with motor mode, to export for kinetic energy the electric energy conversion carried by closed-center system 500 to speed reduction gearing 600, the kinetic energy being delivered to speed reduction gearing 600 is the most all delivered to wheel, travels to drive vehicle.
Energy transferring path under three propulsion source operating modes is (wherein arrow points is energy transferring direction) as shown in Figure 9, article one, energy transferring path is: the kinetic energy that driving engine 100 self produces is passed to speed reduction gearing 600 through first clutch 200, and finally transfers to wheel; Another energy transferring path is: the electric energy in closed-center system 500 after the first motor 300 is converted into kinetic energy, then is passed to speed reduction gearing 600 through the 3rd power-transfer clutch 700, and finally transfers to wheel; An energy transferring path is again: the electric energy in closed-center system 500 is passed to speed reduction gearing 600 after the second motor 400 is converted into kinetic energy, and finally transfers to wheel.
Except above various work operating mode, described driving method also comprises the described drive system of control and is in damped condition, when described drive system is in damped condition, 3rd power-transfer clutch 700 engages, kinetic energy from wheel group drives the first motor 300 and/or the second motor 400 to generate electricity through speed reduction gearing, charges to closed-center system 500.First clutch 200 is separated with second clutch 800.
Described driving method also comprises the described drive system of control and is in external power charging operating mode, when described drive system is in external power charging operating mode, by the external charge interface use external source on described closed-center system 500 for closed-center system 500 charges.
When the normal smooth-ride of vehicle and closed-center system 500 energy storage is sufficient time, such as when the demand power of drive system be less than or equal to the second motor 400 horsepower output, the state-of-charge of closed-center system 500 is greater than 40% simultaneously time, control described drive system and be in pure electronic operating mode.
When the normal smooth-ride of vehicle but closed-center system 500 is in energy storage not enough state time, such as when the demand power of described drive system be less than or equal to the second motor 400 horsepower output, the state-of-charge of closed-center system 500 is less than or equal to 40% but is greater than 15% simultaneously time, control described drive system and be in series connection operating mode.
When closed-center system 500 is in energy storage wretched insufficiency state and vehicle is in good driving cycle, such as when the state-of-charge of closed-center system 500 is less than or equal to 15%, when the demand power being not enough to driving second motor 400, simultaneously drive system is less than the horsepower output of driving engine, controls described drive system and be in engine operating condition.Under engine operating condition, only vehicle is driven to travel by driving engine 100 as propulsion source.
When vehicle is in climbing or the driving cycle such as acceleration but closed-center system 500 is in the not enough state of energy storage, such as when the demand power of drive system be greater than the second motor 400 horsepower output and be less than or equal to the horsepower output of the second motor 400 and driving engine horsepower output sum, the state-of-charge of closed-center system 500 is less than or equal to 40% but is greater than 15% simultaneously time, control described drive system and be in series-parallel connection operating mode.Under series-parallel connection operating mode, driving engine 100 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.
When vehicle is in climbing or the driving cycle such as acceleration and closed-center system 500 energy storage is sufficient, such as when the demand power of drive system be greater than the second motor 400 horsepower output and be less than or equal to the horsepower output of the second motor 400 and driving engine horsepower output sum, the state-of-charge of closed-center system 500 is greater than 40% simultaneously time, control described drive system and be in operating mode in parallel.Under operating mode in parallel, driving engine 100 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.
When vehicle is in extremely severe driving cycle, such as when the demand power of drive system is greater than the horsepower output sum of the horsepower output of the second motor 400 and driving engine, controls described drive system and be in three propulsion source operating modes.Under three propulsion source operating modes, driving engine 100, first motor 300 and the second motor 400 drive vehicle to travel as propulsion source simultaneously.
The driving method of hybrid electric drive system provided by the invention can according to the Real-road Driving Cycle of vehicle, flexible control-driven system is in various mode of operation, and drive system is based on motor driving, and make engine operation in its maximal efficiency district, not only realize the object of energy Appropriate application, and the object of energy-conserving and environment-protective can be realized.

Claims (8)

1. a hybrid electric drive system, described drive system comprises: driving engine (100), first clutch (200), first motor (300), second motor (400), closed-center system (500), and speed reduction gearing (600), described driving engine (100) is connected with speed reduction gearing (600) by power-transfer clutch (200), described closed-center system (500) is electrically connected respectively with the first motor (300) and the second motor (400), described second motor (400) is connected with speed reduction gearing (600), it is characterized in that: described hybrid electric drive system also comprises second clutch (800) and the 3rd power-transfer clutch (700), described driving engine (100) is connected by second clutch (800) with the first motor (300), described first motor (300) is connected by the 3rd power-transfer clutch (700) with speed reduction gearing (600).
2. drive system according to claim 1, is characterized in that: described closed-center system (500) has external charge interface, charges to closed-center system (500) to use external power supply.
3. the driving method of a hybrid electric drive system, it is characterized in that: described drive system comprises: driving engine (100), first clutch (200), first motor (300), second motor (400), second clutch (800), 3rd power-transfer clutch (700), closed-center system (500), and speed reduction gearing (600), described driving engine (100) is connected with speed reduction gearing (600) by first clutch (200), described closed-center system (500) is electrically connected respectively with the first motor (300) and the second motor (400), described second motor (400) is connected with speed reduction gearing (600), wherein said driving engine (100) is connected with the first motor (300) by second clutch (800), described first motor (300) is connected by the 3rd power-transfer clutch (700) with speed reduction gearing (600), described driving method comprises:
According to the demand power of described drive system and the energy storage state of closed-center system (500), control described drive system and be in pure electronic operating mode, engine operating condition, operating mode in parallel or three propulsion source operating modes,
When described drive system is in pure electronic operating mode, driving engine (100) and the first motor (300) do not work, first clutch (200) is in released state, closed-center system (500) is in discharge regime, powered to the second motor (400) by closed-center system (500), second motor (400) with motor mode and output kinetic energy to speed reduction gearing (600), now the second motor (400) as propulsion source drive vehicle travel;
When described drive system is in engine operating condition, driving engine (100) works, first clutch (200) is in engagement state, second clutch (800) and the 3rd power-transfer clutch (700) are in released state, be passed to speed reduction gearing (600) with the kinetic energy exported by driving engine (100), now driving engine (100) drives vehicle to travel as propulsion source;
When described drive system is in operating mode in parallel, driving engine (100) works, first clutch (200) is in engagement state, speed reduction gearing (600) is passed to the kinetic energy exported by driving engine (100), closed-center system (500) is powered to the second motor (400), second motor (400) with motor mode and output kinetic energy to speed reduction gearing (600), now driving engine (100) and the second motor (400) drive vehicle to travel as propulsion source simultaneously;
When described drive system is in three propulsion source operating modes, driving engine (100) works, first clutch (200) is in engagement state, speed reduction gearing (600) is passed to the kinetic energy exported by driving engine (100), closed-center system (500) is simultaneously to the first motor (300) and the second motor (400) power supply, 3rd power-transfer clutch (700) is in engagement state second motor (400), first motor (300) and the second motor (400) with motor mode and output kinetic energy to speed reduction gearing (600), now driving engine (100), first motor (300), and drive vehicle to travel as propulsion source while of the second motor (400).
4. driving method according to claim 3, it is characterized in that: described driving method also comprises the described drive system of control and is in series connection operating mode, second clutch (800) is in bonding state, driving engine (100) works and drives the first motor (300) with generator mode, thus closed-center system (500) is charged, first clutch (200) is in released state, powered to the second motor (400) by closed-center system (500), second motor (400) with motor mode and output kinetic energy to speed reduction gearing (600), now the second motor (400) drives vehicle to travel as propulsion source.
5. driving method according to claim 4, it is characterized in that: described driving method also comprises the described drive system of control and is in series-parallel connection operating mode, second clutch (800) combines, driving engine (100) works and passes through second clutch (800) and drives the first motor (300) with generator mode, thus closed-center system (500) is charged, first clutch (200) is in engagement state, speed reduction gearing (600) is passed to the kinetic energy exported by driving engine (100), powered to the second motor (400) by closed-center system (500) simultaneously, second motor (400) with motor mode and output kinetic energy to speed reduction gearing (600), now driving engine (100) and the second motor (400) drive vehicle to travel as propulsion source simultaneously.
6. driving method according to claim 3, is characterized in that: when closed-center system (500) is in energy storage wretched insufficiency state, and when described demand power is less than the horsepower output of driving engine (100), control described drive system and be in engine operating condition,
When described drive system is in engine operating condition, engine output is greater than vehicle needs power, second clutch (800) is in bonding state, and driving engine (100) drives the first motor (300) with generator mode, thus charges to closed-center system (500).
7. driving method according to claim 3, it is characterized in that: described driving method also comprises the described drive system of control and is in damped condition, when described drive system is in damped condition, 3rd power-transfer clutch (700) engages, kinetic energy from wheel group drives the first motor (300) and the second motor (400) generating through speed reduction gearing, charges to closed-center system (500).
8. driving method according to claim 5, its spy is:
When described demand power is less than or equal to the horsepower output of the second motor (400), judge the energy storage state of closed-center system (500) further:
When closed-center system (500) is in energy storage deficiency state, controls described drive system and be in series connection operating mode; Otherwise control described drive system and be in pure electronic operating mode;
When described demand power is greater than the horsepower output of the second motor (400) and is less than or equal to the horsepower output sum of the horsepower output of the second motor (400) and driving engine (100), judge the energy storage state of closed-center system (500) further:
When closed-center system (500) is in energy storage deficiency state, controls described drive system and be in series-parallel connection operating mode; Otherwise control described drive system and be in operating mode in parallel; And
When described demand power is greater than the horsepower output sum of the horsepower output of the second motor (400) and driving engine (100), controls described drive system and be in three propulsion source operating modes.
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