CN104477051A - Power differentiation matching method of driving motors of double-drive-shaft and double-motor battery electric vehicle - Google Patents
Power differentiation matching method of driving motors of double-drive-shaft and double-motor battery electric vehicle Download PDFInfo
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Abstract
The invention provides a power differentiation matching method of driving motors of a double-drive-shaft and double-motor battery electric vehicle. The method is characterized by comprising the steps of performing sectional differentiation matching for rated powers of a small motor M1 and a large motor M2 to generate M1, M2 and M1+M2 efficient power grades respectively corresponding to low cruising speed, medium cruising speed and high cruising speed of the vehicle, so as to achieve the efficient running of the motors in the whole cruising speed range; performing sectional differentiation matching for external characteristic power of M1 and M2 to respectively generate M1, M2 and M1+M2 external characteristic power grades to meet the demands on corresponding low power, medium power and high power of the vehicle. With the adoption of the method, the power requirement of the vehicle can be met, and the utilization efficiency of the driving motors can be improved.
Description
Technical field
The invention belongs to electrical vehicular power drive system technical field, relate to the power match of a kind of pure electric vehicle driving motor and car load, especially the two difference power alienation coupling of driving axle double-motor pure electric vehicle driving motor of a class.
Background technology
In recent years, in the face of energy shock and environmental pollution dual-pressure, world car industry faces strategic transformation, and pure electric automobile has become one of Domestic Automotive Industry strategic development direction.Ripely in the market pure electronicly mostly adopt single motor single axle actuation techniques scheme, for this type of technical scheme, in the parameter matching of drive motor and car load, carry out large quantity research both at home and abroad.But mostly have larger power based on the motor that such technical scheme is mated, its quality and size are also corresponding larger.For making motor at subregion Effec-tive Function, such technical scheme mostly needs to mate corresponding speed change system, adds complete vehicle quality so on the one hand, reduces arrangement space on the other hand.
A kind ofly novel twoly drive axle double-motor pure electric vehicle technical scheme, by carrying out Proper Match to two motor that drives, on the one hand, the magnitude of power of every platform motor can be reduced, the size of balanced motor and quality, on the other hand, the well-to-do speed regulation characteristics of motor can be given full play to, while improving car load dynamic property, economy, complete vehicle quality can be reduced, preferred arrangement space.Compared with mating with the parameter of electric machine under traditional single motor single axle actuation techniques scheme, the parameter matching that such pair drives axle double-motor pure electric vehicle driving motor has different requirements and feature, for ensureing the dynamic property requirement of vehicle under different driving conditions, realize the Effec-tive Function of drive motor within the scope of whole vehicle cruise.
Summary of the invention
According to deficiency of the prior art, the problem to be solved in the present invention is: propose a kind of for two differentiation matching process driving axle double-motor pure electric vehicle driving motor parameter, based on the conventional speed of a motor vehicle of cruising of vehicle, segmentation differentiation coupling is carried out to small machine M1 and heavy motor M2 rating horsepower, formed and correspond to M1, M2, M1+M2 tri-sections of highly efficient power grades that the basic, normal, high speed of a motor vehicle of cruising commonly used by vehicle, realize the Effec-tive Function of drive motor within the scope of whole vehicle cruise; With power performance requirement for foundation, segmentation differentiation coupling is carried out to M1, M2 external characteristic power, M1, M2, M1+M2 tri-sections of external characteristic power grades corresponding to the basic, normal, high dynamic property demand of vehicle can be formed, namely can ensure power performance requirement, the utilization ratio of drive motor can be improved again.
The technical solution adopted for the present invention to solve the technical problems is: carry out differentiation coupling to a kind of two forward and backward parameter of electric machine driving axle double-motor pure electric vehicle, it is characterized in that:
The forward and backward bridge of vehicle is drive axle, and according to the distribution of car load axle load, the drive motor that Matching installation external characteristic power and rating horsepower are all not identical, the axle that axle load is less installs low-power machine, this patent is called M1, and the axle that axle load is larger installs heavy-duty motor, and this patent is called M2.
The purposes of axle double-motor pure electric vehicle and conventional operating mode is driven according to two, determine the basic, normal, high speed of a motor vehicle of cruising that vehicle is conventional, and based on the conventional speed of a motor vehicle of cruising of this sectional type, segmentation differentiation coupling is carried out to double-motor rating horsepower: during coupling M1, should ensure that its rating horsepower can meet separately the power demand of battery-driven car under conventional low cruise driving cycle, when two drive axle double-motor pure electric vehicle travel under the low speed of a motor vehicle of cruising time, M1 single shaft is adopted to drive vehicle operating, M1 can be made to work in higher load rate driving condition, realize the Effec-tive Function of M1, during coupling M2, should ensure that its rating horsepower can meet separately battery-driven car cruising at moderate speed road horsepower demand, when two drive axle double-motor pure electric vehicle in cruise travel under the speed of a motor vehicle time, M2 single shaft is adopted to drive vehicle operating, M2 can be made to work in higher load rate driving condition, realize the Effec-tive Function of motor 2, in addition, when the rating horsepower of M1 and M2 is mated, need consider simultaneously the power stage of M1 in Effec-tive Function district and M2 the power stage sum in Effec-tive Function district should meet vehicle high-speed cruise travel time required power, when two drive axle double-motor pure electric vehicle travel under height cruises the speed of a motor vehicle time, adopt double-motor combination drive, the double-motor power combination realized under significant power demand condition exports, under ensureing that double-motor output gross horsepower meets the prerequisite of driving power demand requirement, control is distributed by carrying out realtime power to dual motors system, the Effec-tive Function of motor driven systems can be realized.Based on the conventional speed of a motor vehicle of cruising of vehicle, segmentation differentiation coupling is carried out to driving M1 and M2 rating horsepower, finally can form M1, M2, M1+M2 tri-sections of highly efficient power grades commonly using the basic, normal, high speed of a motor vehicle of cruising corresponding to vehicle, realize drive motor and drive the Effec-tive Function within the scope of whole vehicle cruise.
Electric system has short-time overload capacity, on the rating horsepower basis of having mated, according to two tractive performance driven required by axle double-motor pure electric vehicle, sectional type differentiation coupling is carried out to the total external characteristics driving power of double-motor: first need the peak acceleration according to vehicle and max. climb slope designing requirement, to dual motors system, namely the external characteristic power of M1+M2 mates, to ensure its peak acceleration that can meet vehicle and max. climb slope designing requirement simultaneously, dynamic property is required high twoly to drive axle double-motor pure electric vehicle, M1 and M2 can adopt larger overload factor, to ensure that car load has larger reserve horsepower, general pure electric vehicle is required for dynamic property, M1 and M2 can adopt less overload factor, further, M2 external characteristic power is mated, to ensure that it can meet the medium power performance requriements of vehicle under starting or the medium speed of a motor vehicle, if when pure electric vehicle requires larger tractive performance, the M1+M2 double-motor aero mode that reserve horsepower is larger can be switched to, M1 external characteristic power is mated, to ensure that it can meet the low-power performance requriements of vehicle under starting or low speed, if when pure electric vehicle requires larger tractive performance, M2 or M1+M2 aero mode can be switched to.With power performance requirement for foundation, segmentation differentiation coupling is carried out to the external characteristic power of M1, M2, M1, M2, M1+M2 tri-sections of external characteristic power grades corresponding to the basic, normal, high dynamic property demand of vehicle can be formed, namely can ensure power performance requirement, the utilization ratio of drive motor can be improved again.
The invention has the advantages that:
1, one drives axle double-motor pure electric vehicle driving motor difference power alienation matching process for two, based on the conventional speed of a motor vehicle of cruising of vehicle, segmentation differentiation coupling is carried out to double-motor rating horsepower, M1, M2, M1+M2 tri-sections of highly efficient power grades corresponding respectively to the basic, normal, high speed of a motor vehicle of cruising of vehicle can be formed, realize motor at the whole Effec-tive Function cruised in vehicle speed range;
2, a kind of novel pair is driven axle double-motor pure electric vehicle driving motor difference power alienation matching process, with power performance requirement for foundation, segmentation differentiation coupling is carried out to double-motor external characteristic power, M1, M2, M1+M2 tri-sections of external characteristic power grades corresponding respectively to the basic, normal, high dynamic property demand of vehicle can be formed, namely can ensure power performance requirement, drive motor utilization ratio can be improved again;
3, one drives axle double-motor pure electric vehicle driving motor difference power alienation matching process for two, can reduce the magnitude of power of every platform motor, the size of balanced motor and quality.
Accompanying drawing explanation
Fig. 1 drives axle double-motor pure electric vehicle structure and control system schematic diagram for two.
Fig. 2 drives driving power and resistance to motion power diagram when axle double-motor pure electric vehicle travels for two.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
Two shown in Fig. 1 drive axle double-motor pure electric vehicle structure and control system comprises: entire car controller, front axle electric machine controller, front spindle motor, rear axle electric machine controller, rear spindle motor, battery management system, electrokinetic cell, front main reduction gear, front diff, rear primary gearbox, rear diff, front vehicle wheel, rear wheel.
Fig. 2 sets forth M1 rating horsepower, total external characteristics driving power and Effec-tive Function region thereof, M2 rating horsepower, total external characteristics driving power and Effec-tive Function region thereof, the rating horsepower of double-motor hybrid drive system, total external characteristics driving power and Effec-tive Function region thereof.
1, the forward and backward bridge of vehicle is drive axle, and according to the distribution of car load axle load, the drive motor that Matching installation external characteristic power and rating horsepower are all not identical, the axle that axle load is less installs low-power machine M1, and the axle that axle load is larger installs heavy-duty motor M2.
2, differentiation coupling is carried out to motor rated power, to ensure the Effec-tive Function of motor driven systems according to the conventional speed of a motor vehicle.For this reason, drive the purposes of axle double-motor pure electric vehicle and conventional state of cyclic operation according to two, determine the low vehicle velocity V of cruising that vehicle is conventional
1, in cruise vehicle velocity V
2and height cruises vehicle velocity V
3, and based on the conventional speed of a motor vehicle of cruising of this sectional type, rating horsepower coupling is carried out to motor, as shown in set of equations (1).Namely vehicle cruise on the road good without the gradient travel required for power:
（1）
In formula, P
e1, P
e2, P
e3be respectively the rating horsepower of M1, M2 and double-motor mixed system;
for power drive system efficiency;
for coefficient of rolling resistance; C
nfor aerodynamic drag factor; A is sectional area windward, and m is complete vehicle quality; G is acceleration due to gravity.
As shown in Figure 2, can find out according to the power balance curve that vehicle cruises when travelling on the road good without the gradient, the rating horsepower curve of M1, M2 after matched design and dual-motor drive system is respectively V in the speed of a motor vehicle
1, V
2and V
3time crossing with vehicle travel resistance horsepower curve.
Carry out rating horsepower matching process according to above-mentioned sectional type motor, can find out, when pure electric vehicle runs on low cruise operating mode, i.e. V≤V
1speed of a motor vehicle operating mode, the power required for vehicle travels is relatively little, now adopts M1 single shaft to drive vehicle operating, M1 can be made to work in High Load Rate driving condition, realize the Effec-tive Function of M1; When two drive axle double-motor pure electric vehicle run under cruising at moderate speed operating mode time, i.e. V
1≤ V≤V
2speed of a motor vehicle operating mode, the power required for vehicle travels correspondingly increases, and now M1 cannot meet car load driving requirement, M2 single shaft can be adopted to drive vehicle operating, make M2 work in High Load Rate driving condition, realize the Effec-tive Function of motor 2; When two drive axle double-motor pure electric vehicle run under high-performance cruise operating mode time, i.e. V
2≤ V≤V
3speed of a motor vehicle operating mode, power required for vehicle travels is larger, now M2 cannot meet car load driving requirement, double-motor combination drive can be adopted, the double-motor high power combination realized under significant power demand condition exports, under ensureing that double-motor output gross horsepower meets the prerequisite of driving power demand requirement, distribute control by carrying out realtime power to dual motors system, the Effec-tive Function of double-motor can be realized.As seen from Figure 2, based on the conventional speed of a motor vehicle of cruising of vehicle, segmentation differentiation coupling is carried out to double-motor rating horsepower, M1, M2, M1+M2 tri-sections of highly efficient power grades corresponding respectively to the basic, normal, high speed of a motor vehicle of cruising of vehicle can be formed, make car load resistance to motion horsepower curve through the Effec-tive Function district under different electrical machine working mode.
3, on above-mentioned mated rating horsepower basis, according to two tractive performance driven required by axle double-motor pure electric vehicle, sectional type differentiation coupling is carried out to the total external characteristics driving power of motor.
First need the peak acceleration according to vehicle and max. climb slope designing requirement, to motor dual motors system, namely the external characteristic power of M1+M2 mates, to ensure its peak acceleration that can meet vehicle and max. climb slope designing requirement simultaneously.As shown in Figure 2, M1+M2 external characteristic power curve and P
rcar load resistance to motion horsepower curve institute region is vehicle reserve horsepower, and require high twoly to drive axle double-motor pure electric vehicle for dynamic property, M1 and M2 can adopt larger overload factor, to ensure that car load has larger reserve horsepower; Require general pure electric vehicle for dynamic property, M1 and M2 can adopt less overload factor.The power relation that external characteristic power matching process relates to is as shown in set of equations (3):
（2）
In formula, P
a, P
i, P
max1, P
max2resistance power, M1 external characteristic power and M2 external characteristic power when resistance power, vehicle climbing when being respectively vehicle acceleration; V
mfor accelerating the speed of a motor vehicle in latter stage; V is actual vehicle speed; For convesion factor; i
0for maximum grade;
1,
2be respectively M1, M2 overload factor.
M2 external characteristic power is mated, with ensure its can meet vehicle starting or the medium speed of a motor vehicle under medium power require with, as shown in set of equations (3).Based on this type of matching process, external characteristic power matched design is carried out to M2, motor can be ensured under medium power requires with higher rate of load condensate operation, realize the Effec-tive Function of M2, if when pure electric vehicle needs larger power, the M1+M2 double-motor pattern that reserve horsepower is larger can be switched to:
（3）
In formula, V
mmfor accelerating the speed of a motor vehicle in latter stage under starting or medium speed of a motor vehicle operating mode.
M1 external characteristic power is mated, to ensure that it can meet the low-power requirement of vehicle under starting or low speed, as shown in set of equations (4).Based on this type of matching process, external characteristic power matched design is carried out to M1, can ensure motor low-power require under with higher rate of load condensate operation, realize the Effec-tive Function of M1; If when pure electric vehicle requires larger power, M2 or M1+M2 pattern can be switched to respectively.By carrying out external characteristic power differentiation coupling to motor, the starting of guarantee car load or under low speed of a motor vehicle operating mode while acceleration capability, the Effec-tive Function of M1 can be realized:
（4）
In formula, V
lmthe speed of a motor vehicle in latter stage is accelerated under starting or low speed of a motor vehicle operating mode.
Claims (5)
1. pair a kind of two forward and backward power of motor driving axle double-motor pure electric vehicle carries out differentiation coupling, it is characterized in that: the forward and backward bridge of vehicle is drive axle, and according to the distribution of car load axle load, coupling rating horsepower, the drive motor that external characteristic power is all not identical, the axle coupling low-power machine M1 that axle load is less, the axle coupling heavy-duty motor M2 that axle load is larger.
2. according to claim 1 pair is driven axle double-motor pure electric vehicle motor matching process, segmentation differentiation coupling is carried out to motor rated power, it is characterized in that: drive the purposes of axle double-motor pure electric vehicle and conventional state of cyclic operation according to two, determine the low vehicle velocity V of cruising that vehicle is conventional
1, in cruise vehicle velocity V
2and height cruises vehicle velocity V
3, and based on the conventional speed of a motor vehicle of cruising of this sectional type, the motor rated power that vehicle cruises required for traveling on the road good without the gradient is mated, as shown in set of equations (1):
（1）
In formula, P
e1, P
e2, P
e3be respectively the rating horsepower of M1, M2 and double-motor mixed system;
for power drive system efficiency;
for coefficient of rolling resistance; C
nfor aerodynamic drag factor; A is sectional area windward; M is complete vehicle quality; G is acceleration due to gravity.
3. two according to claim 1 and 2 drive axle double-motor pure electric vehicle motor matching process, segmentation differentiation coupling is carried out to double-motor external characteristic power, it is characterized in that: according to vehicle peak acceleration and max. climb slope designing requirement, to dual motors system, namely the external characteristic power of M1+M2 mates, require high twoly to drive axle double-motor pure electric vehicle for dynamic property, M1 and M2 can adopt larger overload factor, to ensure that car load has larger reserve horsepower; Require general pure electric vehicle for dynamic property, M1 and M2 can adopt less overload factor, and the power relation that matching process relates to is as shown in set of equations (2):
（2）
In formula, P
a, P
i, P
max1, P
max2resistance power, M1 external characteristic power and M2 external characteristic power when resistance power, vehicle climbing when being respectively vehicle acceleration; V
mfor accelerating the speed of a motor vehicle in latter stage; V is actual vehicle speed;
for convesion factor; i
0for maximum grade;
,
be respectively M1, M2 overload factor.
4. two according to claim 1,2 and 3 drive axle double-motor pure electric vehicle motor matching process, mate M2 external characteristic power, with ensure its can meet the medium power of vehicle under starting or the medium speed of a motor vehicle require with, as shown in set of equations (3):
（3）
In formula, V
mmfor accelerating the speed of a motor vehicle in latter stage under starting or medium speed of a motor vehicle operating mode.
5. two according to claim 1,2,3 and 4 drive axle double-motor pure electric vehicle motor matching process, mate, to ensure that it can meet the low-power requirement of vehicle under starting or low speed, as shown in set of equations (4) to M1 external characteristic power:
（4）
In formula, V
lmfor accelerating the speed of a motor vehicle in latter stage under starting or low speed of a motor vehicle operating mode.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105691238A (en) * | 2016-03-01 | 2016-06-22 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Automatic running control method for electric car |
| CN106080258A (en) * | 2016-06-07 | 2016-11-09 | 冯旋宇 | The power outgoing management method and system of electric motor car |
| CN108215747A (en) * | 2018-01-02 | 2018-06-29 | 重庆大学 | The bi-motor arrangement of pure electric automobile and the torque optimization method based on convex optimized algorithm |
| CN108528275A (en) * | 2018-05-28 | 2018-09-14 | 武汉理工大学 | A kind of power distribution of In-wheel motor driving city bus and power matching method |
| CN109747432A (en) * | 2017-11-08 | 2019-05-14 | 郑州宇通客车股份有限公司 | Coaxial double-motor power control method, system and coaxial double-motor power system |
| CN111086501A (en) * | 2019-12-12 | 2020-05-01 | 坤泰车辆系统（常州）有限公司 | Energy consumption optimization method for pure electric vehicle |
| CN112874520A (en) * | 2021-02-03 | 2021-06-01 | 宜宾丰川动力科技有限公司 | Vehicle control method, device, equipment and storage medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105691238A (en) * | 2016-03-01 | 2016-06-22 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Automatic running control method for electric car |
| CN105691238B (en) * | 2016-03-01 | 2018-05-15 | 福建省汽车工业集团云度新能源汽车股份有限公司 | A kind of electric automobile automatic ride control method |
| CN106080258A (en) * | 2016-06-07 | 2016-11-09 | 冯旋宇 | The power outgoing management method and system of electric motor car |
| CN109747432A (en) * | 2017-11-08 | 2019-05-14 | 郑州宇通客车股份有限公司 | Coaxial double-motor power control method, system and coaxial double-motor power system |
| CN108215747A (en) * | 2018-01-02 | 2018-06-29 | 重庆大学 | The bi-motor arrangement of pure electric automobile and the torque optimization method based on convex optimized algorithm |
| CN108215747B (en) * | 2018-01-02 | 2019-08-27 | 重庆大学 | The torque optimization method of bi-motor arrangement and convex optimized algorithm based on pure electric automobile |
| CN108528275A (en) * | 2018-05-28 | 2018-09-14 | 武汉理工大学 | A kind of power distribution of In-wheel motor driving city bus and power matching method |
| CN108528275B (en) * | 2018-05-28 | 2020-11-17 | 武汉理工大学 | Power distribution and power matching method for driving urban public transport by hub motor |
| CN111086501A (en) * | 2019-12-12 | 2020-05-01 | 坤泰车辆系统（常州）有限公司 | Energy consumption optimization method for pure electric vehicle |
| CN112874520A (en) * | 2021-02-03 | 2021-06-01 | 宜宾丰川动力科技有限公司 | Vehicle control method, device, equipment and storage medium |
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