CN204567259U - A kind of hybrid vehicle system - Google Patents
A kind of hybrid vehicle system Download PDFInfo
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- CN204567259U CN204567259U CN201520069892.0U CN201520069892U CN204567259U CN 204567259 U CN204567259 U CN 204567259U CN 201520069892 U CN201520069892 U CN 201520069892U CN 204567259 U CN204567259 U CN 204567259U
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Abstract
The utility model relates to a kind of hybrid vehicle system.A kind of hybrid vehicle system, its propulsion source is combustion engine and drive motor, the power provided is passed to wheel by rotating speed, torque coupling device, also add energy management unit and two electromechanical cell EMB in the present system, energy management unit and electrokinetic cell, drive motor, two major parts such as EMB and electrical generator are interconnected by electric loop, under the guidance of energy management strategies design rule, the energy management strategies of system is specialized, has planned the flow direction of energy under different operating mode in detail.The advantage of native system is: control that two EMB mainly carry out in short-term, high-power output, electrokinetic cell and combustion engine then work in more stable, consistent operating mode, originally the undesirable operating mode should born by electrokinetic cell and combustion engine is changed into and is born by EMB, thus realize optimizing the objects such as car load dynamic property, economy, raising electrokinetic cell life-span.
Description
Technical field
The utility model relates to a kind of hybrid vehicle system, and particularly a kind of pair electromechanical cell that adopts is as the hybrid vehicle system of energy buffer device.
Background technology
Electromechanical cell (Electro-Magnetic Battery, EMB) be a kind of Novel energy storage apparatus, typical EMB structure as shown in Figure 1, primarily of formations such as high-speed bearing, vacuum chamber, rotor flywheel and stator winding, the rotor flywheel of EMB is generally with High Rotation Speed, the principle of work of EMB is: when stator field rotating speed is higher than spinner velocity, field drives rotor flywheel accelerates, this process is equivalent to electrical motor and is operated in driving operating mode, at this moment converts electrical energy into the mechanical energy of rotor flywheel; When stator field rotating speed is lower than spinner velocity, magnetic field forces rotor flywheel deceleration, and this process is equivalent to electrical motor and is operated in damped condition, at this moment rotor flywheel mechanical energy is converted to electric energy.
From such external characteristic, EMB has the characteristic of battery, EMB is motor/generator in essence, its charge and discharge process be actually accurately and efficiently by demand within a certain period of time with the process of certain rule adjusting rotary speed, EMB operationally has three kinds of mode of operations, namely charge, discharge and dry running, can be regarded as the raising of rotating speed, reduction and maintenance from motor angle.EMB is the same with other closed-center systems, and energy flow, to being unidirectional, namely can not charging simultaneously, discharge.
Have the EMB of rotor flywheel structure as shown in Figure 2, the energy stored by it is provided by following formula:
Wherein, R is rotor diameter, and r is rotor internal diameter, and h is rotor height, and density of material is ρ.
As can be seen from formula (I), after rotor flywheel structure size is determined, square being directly proportional of the energy storage size of EMB and rotor Speed of Reaction Wheels.
EMB energy storage, compared to other energy storage modes, has unique advantage: energy storage density is high, and power density is large; State-of-charge (State of charge, SOC) is easily measured; Charge and discharge speed is fast; Long service life; Safety is high, there will not be the situations such as chemical cell burning, blast; Structural robustness is good; Environmentally friendly pollution-free etc.
Hybrid power system common at present also exists following problem:
(1) Brake energy recovery aspect performance is not good
Reason: in order to meet the requirement such as safety, life-span, the charge power of electrokinetic cell is generally limited in reduced levels (being starkly lower than discharge power), namely when Brake energy recovery, battery management system (BMS) limits the maximum braking torque that electrokinetic cell can be provided by drive motor, thus reduces the efficiency of Brake energy recovery.
(2) combustion engine powered property and fuel economy all have optimization space
Reason: dynamic property and economy two factors are relations of restriction mutually, the thinking that hybrid power system improves economy utilizes the ideal output characteristic of electrical motor to reduce the possibility of combustion engine in the work of non-economy interval, in such design, compared with the conventional internal combustion rolling stock of equal-wattage, dynamic property is inevitable weakened to a certain extent under the operating mode that some is large to torque-demand; On the other hand, because the power of the drive motor power phase combustion motor of general hybrid power system is less than normal, at some torque-demand is in and remains combustion engine in the occasion of middle and high level and bear main driving task, like this, combustion engine still needs to be operated in comparatively broad condition range, thus limits fuel economy and improves further.
(3) the electrokinetic cell life-span is shorter
Reason: the energy run-of-the-mill reclaimed by drive motor braking is not high, in different braking operating mode, the time length of energy, size, Changing Pattern are difficult to determine, therefore electrokinetic cell is when carrying out Brake energy recovery, require to absorb the electric current that time length and intensity significantly change, also frequently will switch between charge and discharge simultaneously, make electrokinetic cell service conditions undesirable, upset internal electrical chemical reaction, reduce the electrokinetic cell life-span.
Summary of the invention
For solving the problem, the utility model proposes a kind of couple EMB that adopts as the hybrid power system of fast energy shock absorber, as Fig. 4, this system utilizes EMB discharge and recharge fast, initiatively discharge and recharge, fast response time, efficiency is high, overcharging resisting crosses outstanding features such as putting, by to the rule of energy management and the design of energy management strategies, control two EMB mainly to carry out in short-term, high-power output, electrokinetic cell and combustion engine then work in more stable, consistent operating mode, originally the undesirable operating mode should born by electrokinetic cell and combustion engine is changed into and is born by EMB, thus realize optimizing car load dynamic property, economy, improve the objects such as electrokinetic cell life-span.
By reference to the accompanying drawings, be described as follows:
A kind of hybrid vehicle system, by combustion engine, electrical generator, electrokinetic cell and drive motor composition, the power that combustion engine and drive motor provide passes through rotating speed, torque coupling device is passed to wheel, native system also comprises energy management unit and two electromechanical cell EMB, energy management unit and electrokinetic cell, drive motor, two major parts such as EMB and electrical generator are interconnected by electric loop, wherein, electrokinetic cell, drive motor and two can bi-directional energy between EMB and energy management unit, electrical generator and energy management unit can only unidirectional delivery energy, energy management unit by power electronics unit realize to energy flow between upper-part to control, control that two EMB mainly carry out in short-term, high-power output, electrokinetic cell and combustion engine then work in more stable, consistent operating mode, the undesirable operating mode originally should born by electrokinetic cell and combustion engine are changed into and being born by EMB.
Beneficial effect:
Compare existing hybrid power system, system of the present utility model, owing to have employed EMB as energy snubber and corresponding energy management strategies, has following preceence:
(1) control of combustion motor more focuses on economy, can obtain better fuel of internal combustion engine consumption performance;
(2) the target operation point range of combustion engine is more consistent, and control easily, efficiency is high, and radiating requirements is stablized;
(3) reduce the design parameterss such as the charge and discharge ability of electrokinetic cell, reduce electrokinetic cell type selecting, accreditation difficulty;
(4) electrokinetic cell service conditions is more desirable, specifies the restricted power charging, discharging electric batteries degree of depth, extends the electrokinetic cell life-span;
(5) adopt EMB to cushion as fast energy, the energy that electrokinetic cell can not directly absorb first is absorbed by EMB, improves system capacity organic efficiency;
(6) utilize EMB to provide high-power energy in short-term, while raising economy, ensure dynamic property.
Accompanying drawing explanation
Fig. 1 typical case EMB structural representation.
Fig. 2 typical case EMB rotor structure.
The output characteristic of Fig. 3 EMB when energy estimate methods.
Fig. 4 mixed power system structure figure of the present utility model.
The combustion engine economic zone schematic diagram that Fig. 5 the utility model specifies.
The electrokinetic cell charge and discharge power schematic diagram that Fig. 6 the utility model specifies.
The typical condition schematic diagram of Fig. 7 the utility model hybrid power system.
The SOC interval division legend of Fig. 8 EMB.
Fig. 9 electrical generator charges to the EMB#1 that SOC is lower.
Figure 10 electrical generator charges to the EMB#2 that SOC is lower.
Figure 11 electrical generator charges to EMB#1 and EMB#2 simultaneously.
Figure 12 drive motor charges to the EMB#1 that SOC is lower.
Figure 13 drive motor charges to the EMB#2 that SOC is lower.
Figure 14 drive motor charges to EMB#1 and EMB#2 simultaneously
Figure 15 drive motor charges to the EMB#1 that SOC is lower, and electrical generator charges to the EMB#2 that SOC is higher.
Figure 16 drive motor charges to the EMB#2 that SOC is lower, and electrical generator charges to the EMB#1 that SOC is higher.
The EMB#1 that Figure 17 SOC is higher exports energy to drive motor.
The EMB#2 that Figure 18 SOC is higher exports energy to drive motor.
The EMB#1 that Figure 19 SOC is higher exports energy to drive motor, and electrical generator charges to the EMB#2 that SOC is lower.
The EMB#2 that Figure 20 SOC is higher exports energy to drive motor, and electrical generator charges to the EMB#1 that SOC is lower.
Figure 21 EMB#1 and EMB#2 exports energy to drive motor simultaneously.
The higher EMB#1 of Figure 22 SOC is to power battery charging.
The higher EMB#2 of Figure 23 SOC is to power battery charging.
The higher EMB#1 of Figure 24 SOC is to power battery charging, and electrical generator is to the lower EMB#2 charging of SOC.
The higher EMB#2 of Figure 25 SOC is to power battery charging, and electrical generator is to the lower EMB#1 charging of SOC.
The higher EMB#1 of Figure 26 SOC is to power battery charging, and drive motor is to the lower EMB#2 charging of SOC.
The higher EMB#2 of Figure 27 SOC is to power battery charging, and drive motor is to the lower EMB#1 charging of SOC.
The EMB#1 that Figure 28 SOC is higher exports energy to drive motor, and the lower EMB#2 of SOC is to power battery charging.
The EMB#2 that Figure 29 SOC is higher exports energy to drive motor, and the lower EMB#2 of SOC is to power battery charging.
Figure 30 EMB#1 and EMB#2 is simultaneously to power battery charging.
Wherein: 1, high-speed bearing 2, vacuum chamber 3, rotor flywheel 4, stator winding 5, permanent magnet/rotor windings
Detailed description of the invention
By reference to the accompanying drawings the utility model is explained in further detail.
Compared to the passive charge-discharge characteristic of other batteries, in the utility model, the using value of EMB is embodied in:
(1) initiative of EMB charge and discharge
By amplitude and the frequency of control EMB stator field, EMB can be switched charge and discharge mode on one's own initiative fast by demand, on one's own initiative energy is absorbed and discharge, on one's own initiative adjusting energy absorb and release speed (power); The energy stored as EMB is E
xtime, EMB is according to a certain fixed demand power P
xwhen continuing to export energy to outside, time length t
dmeet expression formula: t
d=E
x/ P
x, work as P
xfor timing, EMB outwards exports energy; Work as P
xfor time negative, EMB absorbs energy from the external world, as Fig. 3, EMB mode of operation can on two symmetrical hyperbolas fast transfer between any two points, be therefore applicable to very much providing in short-term to vehicle, high-performance energy to be to meet dynamic property demand.
(2) overcharging resisting, excessively exoergic power are strong
The energy carrier of EMB is the rotor flywheel rotated, compared to the inner complicated electrochemical transformation of energy of chemical cell, its conversion process of energy simple, intuitive more, the SOC minimum value of EMB is 0%, be defined as the state that rotor Speed of Reaction Wheels is zero, this is chemical cell institute out of reach; SOC be 100% situation be the energy storage state of EMB when being operated in rated speed of rotation.Because EMB inherits the structure of motor, therefore there is the ability exceeding rated speed of rotation work, under the condition that, the bearing working limit enough at rotor flywheel mechanical strength allows, the overload capacity of EMB just equals it and overcharges ability, and therefore the SOC maxim of EMB can more than 100%.Such as under the overload situations of 10%, EMB can store the energy of 21% more, and it overcharges ability and has some idea of.
Mixed power system structure described in the utility model as shown in Figure 4.Fig. 4 have expressed the energy transfer process between each parts, and system uses combustion engine and drive motor as power resources, and the power that both provide finally is passed to wheel by rotating speed, torque coupling device.Drive motor is consumed energy when providing driving torque, the produce power when providing braking torque, and its input, output voltage type are alternating current; The bent axle drive electrical generators work of combustion engine, its generated output changes with the exciting current size of electrical generator, by the load regulating exciting current can change electrical generator combustion motor, in some situation, increasing generator power can make internal combustion engine point move to more economical region, and its input and output voltage type is alternating current; EMB can realize carrying out charge or discharge by a certain rule by the control of related hardware, and its input and output voltage type is alternating current; Electrokinetic cell realizes storage and the release of energy by self electrochemical reaction, and its input and output voltage type is direct current (DC); Above in these devices, EMB and electrokinetic cell are closed-center systems, and electrical generator is power generation assembly, and drive motor is actuating unit and power generation assembly; These parts are all connected on energy management unit, power electronics unit and energy management strategies are two cores of energy management unit, power electronics unit is the person of participating in directly of energy flow, form primarily of rectifier bridge, inverter and DC/DC, rectifier bridge completes AC-DC, inverter completes direct current and becomes interchange, and DC/DC completes boosting or step-down; Energy management strategies mainly runs in a software form in energy management unit, and guidance, supervision power electronics unit complete the energy flow of specifying.
In the utility model, owing to have employed the EMB cushioned as fast energy and the energy management strategies be suitable for mutually with system, design rule and the conventional hybrid system of hybrid power system medium power assembly parts are had any different:
1) combustion engine can only be operated in the economic zone of design, and as Fig. 5, in the present invention, the definition in economic zone is less than general hybrid power system, and make the operating point of combustion engine more concentrated, the torque range that combustion engine can provide in this economic zone is:
2) the maximum charge and discharge power of electrokinetic cell tested by state of cyclic operation in the mean square value of power demand be that Primary Reference designs, as Fig. 6, such design makes the service conditions of electrokinetic cell more consistent equally, under factor such as consideration efficiency, loss etc., separately by electrokinetic cell to drive motor provide/recuperated energy time, the torque range that drive motor can export when carrying out driving/braking is:
3) stored energy capacitance of EMB is mainly so that in road condition test, the energy gap data that obtain are for foundation, and as Fig. 3, the torque range that can export when being undertaken driving or braking by drive motor by EMB is separately:
with
4) work that completes of the accessory generator of combustion engine is more complicated, except powering for vehicle low-pressure system, also will provide electric energy to EMB, for EMB power time, need the economy considering combustion engine.
5) because an EMB can not carry out charging and discharging simultaneously, for realize more flexibly, more efficient energy flow, system have employed two EMB structure, such structure can make two EMB be operated in more state, as states such as charging, another one electric discharges, composition PING-PONG buffer structure, improve energy throughput efficiency, its advantage embodies in the elaboration of subsequent power operating strategy.
The working pattern analysis of system
The operating condition of the hybrid power system in the utility model is comparatively complicated, composition graphs 7, the mode of operation of analysis system:
(1) pure power mode
As the stage in Fig. 71, when the SOC of electrokinetic cell is higher, only electrokinetic cell just can meet the driving/braking torque-demand of system to drive motor, and now drive the energy of vehicle only to be provided by electrokinetic cell, energy during car brakeing is also only absorbed by electrokinetic cell;
(2) EMB and electrokinetic cell mixed mode
As the stage in Fig. 72, when torque-demand is in middle low-level, and electrokinetic cell is when can not meet the requirement of system torque by the driving/braking torque that drive motor can provide, driving/braking torque breach is provided by EMB, preferentially provide energy by the EMB that SOC is higher, preferentially absorb energy by the EMB that SOC is lower; 1. and be 2. the energy gap of system in figure, supplemented by EMB; 1. be and 2. the situation that EMB can make up breach torque completely in figure; 4. with 6. for EMB can not make up the situation of breach torque completely in figure; Wherein 1., 3., 5. and 6. for EMB makes up the operating mode of system dynamic, 2. with 4. for EMB makes up the operating mode of systematic economy type;
(3) pure engine mode
As the stage in Fig. 73, when torque-demand is in medium level, and be positioned at the economic zone of combustion engine, through Torque-sharing strategy, system determines that torque-demand is all provided by combustion engine;
(4) EMB and combustion engine mixed mode
When torque-demand is in medium level, and when the economy of entirety exists the possibility optimized, EMB and combustion engine carry out work jointly, and generally, the SOC of electrokinetic cell is lower for the condition of this situation, and the SOC of EMB is higher;
(5) EMB, combustion engine, electrokinetic cell mixed mode
As stage in Fig. 74 and stage 5, when torque-demand is in middle high level, three provides Driving Torque jointly, and the blending ratio of three carries out optimum allocation in real time by system; The beginning torque-demand in stage 4 increases sharply, the speed that the electric discharge of electrokinetic cell and combustion engine provide the speed of torque to increase lower than demand torque, therefore first torque output is carried out by the rapid discharge of EMB by drive motor, make up the weakness of now dynamic property, after the electrochemical reaction of electrokinetic cell and the transformation of energy of combustion engine reach some strength, EMB cuts down output gradually; The torque-demand in stage 5 is higher, and exceed combustion engine economic zone breakdown torque and electrokinetic cell by drive motor Driving Torque sum, at this moment torque breach is provided by EMB, due to the finite capacity of EMB, only can fill up a part of breach.
The energy management strategies of system
In conjunction with pattern analysis above, the energy management strategies of the utility model system is set forth.Due to major control energy flow to, therefore the change brought from energy management unit angle analysis EMB to hybrid power system and advantage, the energy flow process that lower surface analysis participates in mainly for EMB is analyzed, repeat no more, as the mutual energy transferring between drive motor and electrokinetic cell, the energy transferring etc. between electrical generator and electrokinetic cell having analyzed more complete energy flow process in general hybrid power system.
First combustion engine and drive motor can not be provided in time or be unsuitable for providing in short-term, high-power energy is defined as energy gap, " can not provide in time " and refer to that surplus power is not enough to situation about satisfying the demands when one of combustion engine and drive motor or both are co-located on higher load; " be unsuitable for providing " refer to collaborative at combustion engine and drive motor or both one of power performance or economical not good situation when working independently, energy gap is made up by drive motor Driving Torque by EMB, it is divided three classes, i.e. positive energy breach, noenergy breach and negative energy breach, positive energy breach refers to that vehicle needs EMB exports energy by drive motor; Negative energy breach refers to that vehicle needs EMB absorbs energy by drive motor; Noenergy breach refers to that vehicle needs EMB keeps current energy state, neither absorbs energy, does not also export energy.
Again the SOC of EMB is divided into as in Fig. 8
three intervals,
for low SOC is interval, codomain is [0%, X],
for middle SOC is interval, codomain be (X, Y],
for high SOC is interval, codomain be (Y, 100%], in figure, the value of each train spacing point can adjust according to different designs demand, and in Fig. 8, gray area is the operation interval of EMB, and EMB has electric discharge deeply and the feature of overcharging resisting.
For reducing system condition complexity, getting rid of uneconomic energy flow, the energy management rule extracted is:
(1) EMB is interval at low SOC
time, obstructed motor of overdriving exports energy;
(2) EMB is only interval at high SOC
just to power battery charging;
(3) electrical generator ensure economy prerequisite under to energy management unit conveying capacity;
(4) electrical generator is only to being in
with
the EMB charging in district;
(5) energy priority reclaimed by drive motor is absorbed by the EMB that SOC is lower, is preferentially discharged by the EMB that SOC is higher when providing energy to drive motor;
Energy exchange is not carried out between (6) two EMB.
In conjunction with the energy management rule described in utility model content, the energy management strategies of present system is set forth.
(1) SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
A positive energy breach
The SOC of two EMB is all too low, and obstructed motor of overdriving carries out Energy transmission;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges to the EMB that SOC is lower, as Fig. 9 or 10, when the SOC of two EMB is identical, electrical generator is simultaneously to both chargings, as Figure 11, until the SOC interval of EMB changes, ' SOC interval changes ' here refers to that the SOC due to EMB changes the change in the SOC interval caused, as EMB#1 and EMB#2 simultaneously from
district enters
district;
B noenergy breach
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges to the EMB that SOC is lower, and as Fig. 9 or 10, when the SOC of two EMB is identical, electrical generator charges, as Figure 11, until the SOC interval of EMB changes to both simultaneously;
C negative energy breach
Absorbed by the EMB that SOC is lower by the energy of drive motor feedback, as Figure 12 or 13, when the SOC of two EMB is identical, drive motor charges, as Figure 14, until the SOC interval of EMB changes to both simultaneously;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 15 or 16 to the EMB that SOC is higher; When the SOC of two EMB is identical, electrical generator is no longer to EMB charging, and the energy of two EMB simultaneously stability drive motor feedback, as Figure 14.
(2) SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
or
The SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
A positive energy breach
The EMB higher by SOC exports energy by drive motor, as Figure 17 or 18, until the SOC interval of EMB changes;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 19 or 20, until the SOC interval of EMB changes to the EMB that SOC is lower;
B noenergy breach
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Fig. 9 or 10, until the SOC interval of EMB changes to the EMB that SOC is lower;
C negative energy breach
Absorbed, as Figure 12 or 13, until the SOC interval of EMB changes by the EMB that SOC is lower by the energy of drive motor feedback;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 15 or 16, until the SOC interval of EMB changes to the EMB that SOC is higher.
(3) SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
A positive energy breach
The EMB higher by SOC exports energy to drive motor, and as Figure 17 or 18, when the SOC of two EMB is identical, both export energy by drive motor simultaneously, as Figure 21, until the SOC interval of EMB changes;
If combustion engine works, under the prerequisite ensureing economy, and two EMB do not discharge simultaneously, and so electrical generator charges, as Figure 19 or 20, until the SOC interval of EMB changes to the EMB that SOC is lower;
B noenergy breach
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges to the EMB that SOC is lower, and as Fig. 9 or 10, when the SOC of two EMB is identical, electrical generator charges, as Figure 11, until the SOC interval of EMB changes to both simultaneously;
C negative energy breach
Absorbed by the EMB that SOC is lower by the energy of drive motor feedback, as Figure 12 or 13, when the SOC of two EMB is identical, drive motor charges, as Figure 14, until the SOC interval of EMB changes to both simultaneously;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 15 or 16 to the EMB that SOC is higher; When the SOC of two EMB is identical, electrical generator is no longer to EMB charging, and the energy of two EMB simultaneously stability drive motor feedback, as Figure 14, until the SOC interval of EMB changes.
(4) SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
or
The SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
A positive energy breach
The EMB higher by SOC carries out Energy transmission, as Figure 17 or 18, until the SOC interval of EMB changes;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 19 or 20, until the SOC interval of EMB changes to the EMB that SOC is lower;
B noenergy breach
By the higher EMB of SOC to power battery charging, as Figure 22 or 23, until the SOC interval of EMB changes;
If combustion engine works, so under the prerequisite ensureing economy, electrical generator charges, as Figure 24 or 25, until the SOC interval of EMB changes to the EMB that SOC is lower;
C negative energy breach
By the higher EMB of SOC to power battery charging, meanwhile, absorbed by the EMB that SOC is lower by the energy of drive motor feedback, as Figure 26 or 27, until the SOC interval of EMB changes, now electrical generator does not export energy to EMB.
(5) SOC of EMB#1 is in interval
the SOC of EMB#2 is in interval
A positive energy breach
The EMB higher by SOC exports energy to drive motor, the lower EMB of SOC to power battery charging, as Figure 28 or 29, until the SOC interval of EMB changes; When the SOC of two EMB reaches identical, two EMB export energy by drive motor jointly, no longer to power battery charging, as Figure 21, until the SOC interval of EMB changes;
B noenergy breach
Two EMB jointly to power battery charging, as Figure 30, until the SOC interval of EMB changes;
C negative energy breach
If now the SOC of EMB#1 is higher, the SOC of EMB#2 is lower, so EMB#1 is to power battery charging, absorbed by the EMB#2 that SOC is lower by the energy of drive motor feedback, after EMB#2 is full of electricity, change mode of operation immediately, by EMB#2 to power battery charging, EMB#1 carries out energy absorbing, and this process such as Figure 26 and 27 hockets repeatedly, until energy back process terminates.In this process, for preventing two processes alternately too frequent, when braking energy feedback process occurs, and the SOC of some EMB be 100%, the charging of another one EMB positive power battery time, the following rule of regulation: to the SOC of the EMB of power battery charging lower than a certain threshold value (as 80%) time, two EMB just change charge and discharge mode, are namely converted to the EMB of power battery charging and accept braking energy, SOC be 100% EMB be converted to power battery charging.
Claims (1)
1. a hybrid vehicle system, by combustion engine, electrical generator, electrokinetic cell and drive motor composition, the power that combustion engine and drive motor provide passes through rotating speed, torque coupling device is passed to wheel, it is characterized in that: native system also comprises energy management unit and two electromechanical cell EMB, energy management unit and electrokinetic cell, drive motor, it is interconnected that two EMB and electrical generator major part pass through electric loop, wherein, electrokinetic cell, drive motor and two can bi-directional energy between EMB and energy management unit, electrical generator and energy management unit can only unidirectional delivery energy, energy management unit by power electronics unit realize to energy flow between electrokinetic cell, drive motor, two EMB and electrical generator to control, control that two EMB mainly carry out in short-term, high-power output, electrokinetic cell and combustion engine then work in more stable, consistent operating mode, the undesirable operating mode originally should born by electrokinetic cell and combustion engine are changed into and being born by EMB.
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