CN107862325B - Parameter matching method suitable for double-base-speed motor of pure electric truck - Google Patents

Parameter matching method suitable for double-base-speed motor of pure electric truck Download PDF

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CN107862325B
CN107862325B CN201710989636.7A CN201710989636A CN107862325B CN 107862325 B CN107862325 B CN 107862325B CN 201710989636 A CN201710989636 A CN 201710989636A CN 107862325 B CN107862325 B CN 107862325B
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李波
杨婉莹
张熙
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University of Electronic Science and Technology of China
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Abstract

The invention belongs to the technical field of power systems of electric vehicles, and particularly relates to a parameter matching method for a double-base-speed motor of a pure electric truck, which is used for solving the problem of insufficient parameter matching caused by the application of the double-base-speed motor to the pure electric truck; firstly, collecting the whole vehicle parameters of the pure electric vehicle; then completing the matching of the rated parameters of the low-base-speed motor, including the rated power PvRated speed nbRated torque Thigh(ii) a Finally, matching the peak value parameters of the high-base-speed motor, including the peak power PmaxPeak torque TmaxPeak rotational speed nmax(ii) a And completing the parameter matching of the double-base-speed motor. The parameter matching method for the double-base-speed motor of the pure electric truck is simple and clear, has high universality, is easy to calibrate a matching result, greatly reduces the matching time and reduces the matching cost.

Description

Parameter matching method suitable for double-base-speed motor of pure electric truck
Technical Field
The invention belongs to the technical field of electric vehicle power systems, and particularly relates to a parameter matching method for a double-base-speed motor of a pure electric truck.
Background
At present, the parameter matching of the motor of the existing pure electric cargo vehicle is basically only suitable for a single-base-speed motor, the research on a double-base-speed motor is not mature enough, the rationality of the parameter matching of the double-base-speed motor is directly related to the required power, the driving range and the hundred kilometers of energy consumption of the pure electric cargo vehicle, and the practicability of the whole vehicle is improved to the maximum extent; therefore, the method is very important for researching the parameter matching method of the double-base-speed motor, can shorten the matching time, save the matching cost and shorten the development period of the whole automobile, and has important significance for popularization and long-term development of the electric automobile.
Disclosure of Invention
The invention aims to provide a parameter matching method of a double-base-speed motor suitable for a pure electric truck, which is used for solving the problem of insufficient parameter matching caused by applying the double-base-speed motor to the pure electric truck. In order to realize the purpose, the invention adopts the technical scheme that:
a double-base-speed motor parameter matching method suitable for a pure electric truck is characterized by comprising the following steps:
step 1, acquiring finished vehicle parameters of the pure electric vehicle, comprising the following steps: the full load mass m of the whole automobile, the axle distance L of the automobile and the distance L from the mass center of the automobile to the central line of the rear axle2Height h of automobile mass centergRolling radius r of tire, windward area A, air resistance coefficient CDRolling coefficient f, wheel slip coefficient mu, and overall transmission efficiency etatA final reduction ratio i and a maximum vehicle speed vmaxEconomic vehicle speed viMaximum climbing gradient alphamaxMaximum climbing vehicle speed vaAnd 0 to vmAcceleration time t of km/hm、vmAnd tmAre all preset values;
step 2, matching rated parameters of the low-base-speed motor:
the matching expression of rated power is:
Figure BDA0001441198550000011
matching expression of rated speed:
Figure BDA0001441198550000021
the matching expression of the rated torque is as follows:
Figure BDA0001441198550000022
wherein, δ is a rotating mass conversion coefficient;
step 3, matching the peak value parameters of the high-base-speed motor:
according to cars 0-vmAcceleration time t of km/hmThe relation between the acceleration a and the driving force F is obtained as follows:
Figure BDA0001441198550000023
and the expression of the driving force F is:
Figure BDA0001441198550000024
wherein the content of the first and second substances,
Figure BDA0001441198550000025
Pmaxis the peak power;
is the vehicle speed vbThe relation between the acceleration a and the driving force F is divided into division points and is brought into the motor base speed ratio Ib：
Figure BDA0001441198550000026
The relationship can be found:
Figure BDA0001441198550000027
meanwhile, in the running process of the motor, the power and the torque of the motor reach the maximum value at the same time, namely the relation is satisfied:
Figure BDA0001441198550000028
Tmaxthe peak value torque is combined with the two relational expressions to draw a change curve chart of the peak value power of the motor, the peak value torque and the basic speed ratio of the motor, and the intersection point of the peak value power and the peak value torque is obtained as IbAnd then according to the relation:
Figure BDA0001441198550000029
matching to obtain a peak rotating speed nmax；
Meanwhile, determining a motor peak value parameter by wheel slip: the driving force received by the driving wheel is:
Figure BDA0001441198550000031
the driving torque is:
Figure BDA0001441198550000032
wherein μ is a wheel slip coefficient, L is an automobile wheel base, WfIs the front axle load of the automobile, L2Is the distance h from the center of mass of the automobile to the center line of the rear axlegIs the height of the center of mass of the automobile;
further, according to the peak torque TmaxThe peak power P can be obtained by matchingmax。
The invention has the beneficial effects that: the parameter matching method for the double-base-speed motor of the pure electric truck is simple and clear, has high universality, is easy to calibrate a matching result, greatly reduces the matching time and reduces the matching cost.
Drawings
Fig. 1 is a flow chart of a double-base-speed motor parameter matching method suitable for a pure electric truck according to the invention.
FIG. 2 is a graph showing the variation of the peak power, peak torque and base speed ratio of the motor in the embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The invention provides a double-base-speed motor parameter matching method suitable for a pure electric cargo vehicle, wherein main parts of the pure electric cargo vehicle comprise a vehicle chassis, a vehicle body, a power storage battery, an electric drive control system and the like, and compared with the traditional vehicle, the method is mainly characterized in that a driving motor is used for replacing an engine. The pure electric cargo vehicle mainly drives the motor by the energy provided by the power battery to convert the electric energy into mechanical energy to be transmitted to the transmission system, and then drives the wheels to rotate so as to drive the vehicle to run.
The double-base-speed motor is the power core of the pure electric truck, and the performance of the double-base-speed motor is closely related to the performance of the whole truck. In order to drive a pure electric truck with high performance, the double-base-speed motor needs to meet certain requirements on performance, and is generally required to be frequently started, accelerated, decelerated and stopped, and the dynamic performance requirement of torque control is high; at low speed or on a hill, the torque is high, and at high speed, the torque is low; secondly, the speed regulation range of the motor is wide, the motor works in a constant torque area and a constant power area, and meanwhile, the high operation efficiency is kept in the whole speed regulation range.
According to the requirements of power performance, the peak power of the high-base-speed motor must meet the requirements of the maximum speed, the maximum climbing gradient and the acceleration time of the whole vehicle at the same time, and the peak torque of the low-base-speed motor needs to meet the requirements of low-speed heavy-load running and accelerated starting of the vehicle.
In this embodiment, the parameter matching method for the dual-base-speed motor of the pure electric truck includes the following steps:
1. gather pure electric vehicles whole car parameter, include: the full load mass m of the whole automobile, the axle distance L of the automobile and the distance L from the mass center of the automobile to the central line of the rear axle2Height h of automobile mass centergRolling radius r of tire, windward area A, air resistance coefficient CDRolling coefficient f, wheel slip coefficient mu, and overall transmission efficiency etatA final reduction ratio i and a maximum vehicle speed vmaxEconomic vehicle speed viMaximum climbing gradient alphamaxMaximum climbing vehicle speed va；
2. The determination steps of the rated parameters of the high-basic-speed motor and the low-basic-speed motor are as follows:
analyzing the speed frequency of the common running working condition to obtain a high-frequency interval of the speed of the automobile and obtain four important principles of parameter matching: (1) the high base speed motor should meet the steady state power requirement; (2) the low-base-speed motor should meet the transient power requirement; (3) the high-efficiency interval of the high-base-speed motor is basically within the range of 35km/h to 55 km/h; (4) the high-efficiency interval of the low-base-speed motor is basically in the range of 0km/h to 20 km/h; obtaining a steady-state power expression and a transient-state power expression according to the matching principle (1) and the principle (2), determining the rated parameter of the high-base-speed motor by the steady-state power, and determining the rated parameter of the low-base-speed motor by the transient-state power:
steady state power expression:
Figure BDA0001441198550000041
transient power expression:
Figure BDA0001441198550000042
obtaining a rated rotating speed expression of the double-base-speed motor according to the principle (3) and the principle (4):
Figure BDA0001441198550000043
according to the statistical average acceleration and the average deceleration, the rated torque of the high-base-speed motor can be further calculated as follows:
Figure BDA0001441198550000044
wherein, δ is a rotating mass conversion coefficient;
3. according to cars 0-vmAcceleration time t of km/hmThe relation between the acceleration a and the driving force F is obtained as follows:
Figure BDA0001441198550000045
and the expression of the driving force F is:
Figure BDA0001441198550000051
Pmaxas peak power, the speed v corresponding to the basic speed point of the motorbComprises the following steps:
Figure BDA0001441198550000052
is the vehicle speed vbAs a division point, the relational expression of the acceleration a and the driving force F is divided into two parts:
Figure BDA0001441198550000053
will speed the vehicle vb：
Figure BDA0001441198550000054
And motor base speed ratio Ib：
Figure BDA0001441198550000055
Bringing into availability:
Figure BDA0001441198550000056
according to the maximum power P of the base speed point motor when the acceleration requirement of the automobile is metmaxAnd a maximum torque TmaxCalculating to obtain a base speed ratio of the motor:
Figure BDA0001441198550000057
as can be seen from the variation graphs of the peak power, the peak torque and the basic speed ratio of the motor, as shown in FIG. 2, I can be obtained at the intersection point of the peak power and the peak torquebTaking the value of (A);
determining a motor peak parameter taking into account wheel slip: the driving force received by the driving wheel is:
Figure BDA0001441198550000058
the driving torque is:
Figure BDA0001441198550000059
wherein μ is a wheel slip coefficient, L is an automobile wheel base, WfIs the front axle load of the automobile, L2Is the distance h from the center of mass of the automobile to the center line of the rear axlegIs the height of the center of mass of the automobile.
According to the parameter matching relation, obtaining low-base-speed motor performance parameters such as maximum driving force, maximum motor torque, maximum driving torque and the like; wherein the rated parameter of the high base speed motor and the peak value parameter of the low base speed are generally determined according to the overload coefficient lambda, the value is generally about 2-3 according to experience,
in this embodiment, the matching result of the parameters of the dual-basic-speed motor is shown in the following table:
Figure BDA0001441198550000061
while the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.

Claims (1)

1. A double-base-speed motor parameter matching method suitable for a pure electric truck is characterized by comprising the following steps:
step 1, acquiring finished vehicle parameters of the pure electric vehicle, comprising the following steps: the full load mass m of the whole automobile, the axle distance L of the automobile and the distance L from the mass center of the automobile to the central line of the rear axle2Height h of automobile mass centergRolling radius r of tire, windward area A, air resistance coefficient CDRolling coefficient f, wheel slip coefficient mu, and overall transmission efficiency etatA final reduction ratio i and a maximum vehicle speed vmaxEconomic vehicle speed viMaximum climbing gradient alphamaxMaximum climbing vehicle speed vaAnd 0 to vmAcceleration time t of km/hm、vmAnd tmAre all preset values;
step 2, matching rated parameters of the low-base-speed motor:
the matching expression of rated power is:
Figure FDA0001441198540000011
matching expression of rated speed:
Figure FDA0001441198540000012
the matching expression of the rated torque is as follows:
Figure FDA0001441198540000013
wherein, δ is a rotating mass conversion coefficient;
step 3, matching the peak value parameters of the high-base-speed motor:
according to cars 0-vmAcceleration time t of km/hmThe relation between the acceleration a and the driving force F is obtained as follows:
Figure FDA0001441198540000014
and the expression of the driving force F is:
Figure FDA0001441198540000015
wherein the content of the first and second substances,
Figure FDA0001441198540000016
Pmaxis the peak power;
is the vehicle speed vbDividing the acceleration a into driving forcesThe relation formula of F is split and brought into the basic speed ratio I of the motorb：
Figure FDA0001441198540000017
The relationship can be found:
Figure FDA0001441198540000021
meanwhile, in the running process of the motor, the power and the torque of the motor reach the maximum value at the same time, namely the relation is satisfied:
Figure FDA0001441198540000022
Tmaxthe peak value torque is combined with the two relational expressions to draw a change curve chart of the peak value power of the motor, the peak value torque and the basic speed ratio of the motor, and the intersection point of the peak value power and the peak value torque is obtained as IbAnd then according to the relation:
Figure FDA0001441198540000023
matching to obtain a peak rotating speed nmax；
Meanwhile, determining a motor peak value parameter by wheel slip: the driving force received by the driving wheel is:
Figure FDA0001441198540000024
the driving torque is:
Figure FDA0001441198540000025
wherein μ is a wheel slip coefficient, L is an automobile wheel base, WfIs the front axle load of the automobile, L2Is the distance h from the center of mass of the automobile to the center line of the rear axlegIs the height of the center of mass of the automobile;
further, according to the peak torque TmaxThe peak power P can be obtained by matchingmax。
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CN109960854B (en) * 2019-02-26 2021-01-05 武汉理工大学 Method for simultaneously determining motor parameters and fixed reduction ratio of pure electric vehicle
CN110457638A (en) * 2019-07-26 2019-11-15 武汉格罗夫氢能汽车有限公司 A kind of hydrogen fuel cell electric automobile motor system matching process
CN111553024B (en) * 2020-05-07 2023-04-14 北京理工大学 Multi-objective optimization method and system for driving system of distributed driving electric automobile
CN114132334A (en) * 2021-12-02 2022-03-04 智己汽车科技有限公司 Method and equipment for acquiring hundred-kilometer acceleration time of vehicle

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