CN102267453B - Energy management method for stroke-increased electric motor car - Google Patents

Energy management method for stroke-increased electric motor car Download PDF

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Publication number
CN102267453B
CN102267453B CN 201110126665 CN201110126665A CN102267453B CN 102267453 B CN102267453 B CN 102267453B CN 201110126665 CN201110126665 CN 201110126665 CN 201110126665 A CN201110126665 A CN 201110126665A CN 102267453 B CN102267453 B CN 102267453B
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battery
power
electric
car load
pattern
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CN 201110126665
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Chinese (zh)
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CN102267453A (en
Inventor
曾斌跃
肖小城
杨上东
何彬
柳士江
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奇瑞汽车股份有限公司
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Abstract

The invention provides an energy management method for a stroke-increased electric motor car. The electric motor car is controlled to enter into different energy modes according to the driving condition and the battery electric quantity of the electric motor car, wherein the electric motor car enters into an electric energy consumption mode under the condition of low-speed starting or the conditions of constant-speed cruising and accelerating when the battery electric quantity is higher than a preset value SOC_lim; the electric motor car enters into an electric energy maintaining mode under the conditions of constant-speed cruising and accelerating when the battery electric quantity is equal to or less than a lower limit value SOC_lim_low; the electric motor car enters into a mechanical braking mode under the conditions of speed-reducing and braking when the battery electric quantity is equal to or more than a maximum limit value SOC_max; and the electric motor car enters into a regenerating braking mode under the conditions of speed-reducing and braking when the battery electric quantity is lower than the maximum value SOC_max. According to the energy management method, the electric energy consumption mode and the electric energy maintaining mode are set, thereby realizing the optimized distribution management for the energy flow of the whole electric motor car, promoting the energy use ratio under the condition of meeting the driving requirement, realizing the environmentally-friendly, comfortable and high-efficient energy use, and protecting a battery.

Description

A kind of energy management method of extended-range electric vehicle
Technical field
The invention belongs to the control technology for electric motor car field, specially refer to a kind of energy management method of extended-range electric vehicle.
Background technology
Energy-saving and environmental protection, safety are the developing direction of future automobile, energy savings how, and improving energy utilization efficiency is an important technology of development of automobile.New-energy automobile is not only wanted to reach than still less the energy consumption of regular fuel car, is realized zero-emission, more wants can satisfy chaufeur to many-sided demands such as car load dynamic property, driving, continual mileages.Extended-range electric vehicle utilizes engine power generation to increase the electric energy that drives battery take electrical motor as propulsion source simultaneously, to increase the course continuation mileage of battery-driven car.In extended-range electric vehicle, unique effect of driving engine is generating, when needing to start, but continuous working is under optimum speed again, the power of output and also substantially constant of moment of torsion, thereby its efficient, discharging, reliability etc. all are in preferable states, also save the cost with the motorcoupling coupling.When vehicle-loaded battery electricity quantity is consumed to minimum threshold limiting, distance increasing unit will start and automatically for it continues to provide electric energy, to realize the driving ability up to several hundred kilometers.Can effectively overcome like this conventional electric car short defect of mileage of travelling, the driver need not be worried for this reason.In addition, the capacity of cell of stroke-increasing electric automobile only needs 40% left and right of pure electric automobile, has greatly reduced cost.Stroke-increasing electric automobile is compared with other new forms of energy vehicles, all has clear superiority at the aspects such as comfort feature of efficiency of energy utilization, price, use.
But; the energy management method of above-mentioned extended-range electric vehicle is not yet perfect; possess at the same time in the situation of battery and two kinds of energy sources of driving engine; how when satisfying the multiple demand of chaufeur; realize environmental protection, comfortable, efficient energy utilization; and protect simultaneously battery, be a urgent problem.
Summary of the invention
The objective of the invention is to propose a kind of energy management method of extended-range electric vehicle,, realize environmental protection, comfortable, efficient energy utilization, and protect simultaneously battery when satisfying the multiple driving demand of chaufeur with realization.
At first the key of the energy management method of extended-range electric vehicle of the present invention is that controlling battery-driven car according to the driving cycle of battery-driven car and battery electric quantity selects to enter different energy models, wherein: enter the electric quantity consumption pattern when during low speed starting operating mode or at the uniform velocity cruising condition and accelerating mode and battery electric quantity are higher than predetermined value SOC_lim, control motor and drive car load with predetermined power, only have just to start mileage adder when the car load demand power during higher than described motor predetermined power and be the battery charging; Enter electric weight when at the uniform velocity cruising condition and accelerating mode and battery electric quantity are equal to or less than lower limit SOC_lim_low and keep pattern, the work of controlling mileage adder remains in preset range SOC_lim_low~SOC_lim_high the electric weight of battery; Deceleration and damped condition and battery electric quantity enter the mechanical braking pattern when equaling higher limit SOC_max; Deceleration and damped condition and battery electric quantity enter the regenerative brake pattern during lower than higher limit SOC_max.
Further, in described regenerative brake pattern, if acceleration pedal and brake pedal are not all stepped on, enter F/s regenerative brake pattern, brake pedal is stepped on if acceleration pedal is not stepped on, and enters subordinate phase regenerative brake pattern; The brake power generating moment of torsion of described F/s regenerative brake pattern is less than the brake power generating moment of torsion of subordinate phase regenerative brake pattern.
Further, in described electric quantity consumption pattern, controlling battery-driven car according to the selection of chaufeur enters long apart from mode of operation or dynamic work pattern or economy mode of operation, in its middle and long distance mode of operation, utilize motor to drive car load with the pre-fixed length of battery apart from optimizing power P_Batt_opl, when car load demand power P_req, starts mileage adder and is the battery charging during apart from optimizing power P_Batt_opl greater than the pre-fixed length of battery; In the dynamic work pattern, utilize motor to drive car load with car load demand power P_req,, start mileage adder and be the battery charging during greater than the maximum discharge power P_Batt_max of license of battery as car load demand power P_req; In the economy mode of operation, utilize motor to drive car load with the predetermined economy optimizing power P_Batt_opj of battery,, start mileage adder and be the battery charging during greater than the predetermined economy optimizing power P_Batt_opj of battery as car load demand power P_req; Described pre-fixed length is apart from optimizing power P_Batt_opl≤predetermined economy optimizing power P_Batt_opj<maximum discharge power P_Batt_max of license.
Further, described length is apart from mode of operation, when the car load demand power greater than the pre-fixed length of battery during apart from optimizing power P_Batt_opl, control mileage adder take predetermined length apart from optimizing power P_RE_opl as the battery charging; In described dynamic work pattern, during greater than the maximum discharge power P_Batt_max of the license of battery, control mileage adder take predetermined dynamic property optimizing power P_RE_opD as the battery charging as car load demand power P_req; In described economy mode of operation, during greater than the predetermined economy optimizing power P_Batt_opj of battery, control mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging as car load demand power P_req; Described length is apart from optimizing power P_RE_opl≤predetermined economy optimizing power P_Re_opj<predetermined dynamic property optimizing power P_RE_opD≤maximum power P_RE_max.
Further, described electric weight is kept in pattern, when battery electric quantity is equal to or less than the lower limit SOC_lim_low of preset range or car load demand driving power P_req during greater than predetermined value P_pre, starts mileage adder and is the battery charging; During less than or equal to predetermined value P_pre, close mileage adder higher than the higher limit SOC_lim_high of preset range and car load demand driving power P_req when battery electric quantity, described predetermined value P_pre equals the maximum discharge power of battery.
Further, described electric weight is kept in pattern, control mileage adder take maximum power P_RE_max work as the battery charging when battery electric quantity is equal to or less than lower limit SOC_low_BattSafe and drive car load, otherwise controlling mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging.
Car load energy management pattern is divided into the electric quantity consumption pattern to the energy management method of extended-range electric vehicle of the present invention and electric weight is kept pattern; the car load energy flow is optimized allocation manager; improved energy utilization efficiency under the prerequisite that satisfies the driving demand; realize environmental protection, comfortable, efficient energy utilization, and protected simultaneously battery.
Description of drawings
Fig. 1 is the structure principle chart of extended-range electric vehicle of the present invention.
Fig. 2 is the schematic diagram that concerns of mode of operation under the driving operating mode of extended-range electric vehicle of the present invention and battery electric quantity.
Fig. 3 is the logic control chart of the energy management method of extended-range electric vehicle of the present invention.
Fig. 4 is the logic control chart of electric quantity consumption pattern in the energy management method of extended-range electric vehicle of the present invention.
Fig. 5 is the logic control chart that in the energy management method of extended-range electric vehicle of the present invention, electric weight is kept pattern.
The specific embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings.
Embodiment 1:
As shown in Figure 1, the extended-range electric vehicle of the present embodiment adopts f-w-d, and the power of drive motor output directly arrives drive wheel by change-speed box, diff.The energy that drive motor consumes can be from electrokinetic cell, can be also from mileage adder (abbreviation RE system).Mileage adder is comprised of driving engine and electrical generator, is directly connected on electrokinetic cell dc bus out by inverter.Under some operating mode, can protect battery like this, allow battery quit work, only supply with drive motor with the electric energy of mileage adder output.Wherein, entire car controller is coordinated the equipment such as control and management motor, battery, mileage adder, to realize the control logic of car load energy management.Entire car controller comes to communicate with electric machine controller, battery management system, mileage adder control system by the CAN bus.
As shown in Figure 3, at first the energy management method of the extended-range electric vehicle of the present embodiment is controlled battery-driven car according to the driving cycle of battery-driven car and battery electric quantity and is selected to enter different energy models, wherein: enter the electric quantity consumption pattern when during low speed starting operating mode or at the uniform velocity cruising condition and accelerating mode and battery electric quantity are higher than predetermined value SOC_lim, control motor and drive car load with predetermined power, only have just to start mileage adder when the car load demand power during higher than described motor predetermined power and be the battery charging; Enter electric weight when at the uniform velocity cruising condition and accelerating mode and battery electric quantity are equal to or less than lower limit SOC_lim_low and keep pattern, the work of controlling mileage adder remains in preset range SOC_lim_low~SOC_lim_high the electric weight of battery; It is that battery electric quantity does not allow battery charging that deceleration and damped condition and battery electric quantity equal higher limit SOC_max() time enter the mechanical braking pattern; Deceleration and damped condition and battery electric quantity enter the regenerative brake pattern during lower than higher limit SOC_max.
Above-mentioned energy management method is in the low speed operating mode that starts to walk, and car load directly enters the electric quantity consumption pattern of energy management, and is to carry out work with electric-only mode, like this can fast starting.Drive under operating mode general, comprise and cruising and accelerating mode, this is the signal that gathers according to sensor, the parameters such as battery electric quantity, car load demand power is judged, to determine to select concrete driving operating mode mode of operation.In the brake snub stage, when the battery electric quantity condition does not allow battery to continue charging, only carry out mechanical braking; When other decelerations in addition and damped condition, energy management system can allow drive motor take full advantage of braking energy, carries out energy and reclaims.
Further, in described regenerative brake pattern, if acceleration pedal and brake pedal are not all stepped on, enter F/s regenerative brake pattern, brake pedal is stepped on if acceleration pedal is not stepped on, and enters subordinate phase regenerative brake pattern; The brake power generating moment of torsion of described F/s regenerative brake pattern is less than the brake power generating moment of torsion of subordinate phase regenerative brake pattern.When not stepping on brake pedal when the chaufeur release the gas pedal, the expression chaufeur needs automobile slowly to slow down, and the brake power generating moment of torsion of this moment is less; And when stepping on brake pedal when the chaufeur release the gas pedal, the expression chaufeur needs automobile to slow down rapidly, the brake power generating moment of torsion of this moment is larger, can utilize better like this brake power generating moment of torsion to implement braking deceleration to car load, meets people's driving habit.
As shown in Figure 2, drive mode of operation under operating mode and the relation of battery electric quantity and be divided into two kinds: the first is the electric quantity consumption mode of operation (CD) of energy management: this pattern is mainly that electric weight in the consuming cells is as main, the electric weight SOC of battery is on a declining curve generally, wherein also may fluctuate; The second is the electric weight maintenance work pattern (CS) of energy management: under this mode of operation, the electric weight of battery can be maintained near certain charge value, and fluctuate in preset range SOC_lim_low~SOC_lim_high, substantially remain unchanged generally.
As shown in Figure 4, in described electric quantity consumption pattern, controlling battery-driven car according to the selection of chaufeur enters long apart from mode of operation or dynamic work pattern or economy mode of operation, in its middle and long distance mode of operation, utilize motor to drive car load with the length that calculates of battery apart from optimizing power P_Batt_opl, when car load demand power P_req, starts mileage adder and is the battery charging during apart from optimizing power P_Batt_opl greater than the pre-fixed length of battery; In the dynamic work pattern, utilize motor to drive car load with car load demand power P_req,, start mileage adder and be the battery charging during greater than the maximum discharge power P_Batt_max of license of battery as car load demand power P_req; In the economy mode of operation, utilize motor to drive car load with the predetermined economy optimizing power P_Batt_opj of battery,, start mileage adder and be the battery charging during greater than the predetermined economy optimizing power P_Batt_opj of battery as car load demand power P_req; Described pre-fixed length is apart from optimizing power P_Batt_opl≤predetermined economy optimizing power P_Batt_opj<maximum discharge power P_Batt_max of license.
Long is to carry out energy distribution take the longest continual mileage as controlling target apart from mode of operation; The dynamic work pattern is mainly in order to satisfy the car load demand power of chaufeur; The economy mode of operation is mainly the taking into account system efficiency operation, and degradation of energy is minimum.
Further, above-mentioned length is apart from mode of operation, when the car load demand power greater than the pre-fixed length of battery during apart from optimizing power P_Batt_opl, control mileage adder take predetermined length apart from optimizing power P_RE_opl as the battery charging; In above-mentioned dynamic work pattern, during greater than the maximum discharge power P_Batt_max of the license of battery, control mileage adder charging take predetermined dynamic property optimizing power P_RE_opD as battery as car load demand power P_req; In above-mentioned economy mode of operation, during greater than the predetermined economy optimizing power P_Batt_opj of battery, control mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging as car load demand power P_req; Above-mentioned length is apart from optimizing power P_RE_opl≤predetermined economy optimizing power P_Re_opj<predetermined dynamic property optimizing power P_RE_opD.By controlling the horsepower output of mileage adder, can be under the prerequisite that guarantees the driving demand, make mileage adder as far as possible with optimizing power work, namely the work area of driving engine is optimized control, allow the mileage adder systems attempt be operated in high efficiency region, thus can the optimization energy utilization.Simultaneously, control the battery system charge-discharge velocity, prevent excessive high current charge-discharge, efficiently utilize the energy in battery.
As shown in Figure 5, described electric weight is kept in pattern, when battery electric quantity is equal to or less than the lower limit SOC_lim_low of preset range or car load demand driving power P_req during greater than predetermined value P_pre, starts mileage adder and is the battery charging; During less than or equal to predetermined value P_pre, close mileage adder higher than the higher limit SOC_lim_high of preset range and car load demand driving power P_req when battery electric quantity, described predetermined value P_pre equals the maximum discharge power of battery.Can guarantee that like this battery electric quantity maintains in preset range SOC_lim_low~SOC_lim_high, and formed between the opening and closing of mileage adder between certain state holding area, avoid the frequent start-stop work of driving engine, avoided simultaneously the heavy-current discharge of battery under the low state of electric weight.
Further, the mode that the present embodiment has adopted battery electric quantity follower type control policy and power following type control policy to combine, keep in pattern at electric weight, control mileage adder take maximum power P_RE_max work as the battery charging when battery electric quantity is equal to or less than lower limit SOC_low_BattSafe and drive car load, guarantee that battery electric quantity recovers as early as possible, otherwise control mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging, with the optimization energy utilization.

Claims (5)

1. the energy management method of an extended-range electric vehicle, it is characterized in that at first controlling battery-driven car according to the driving cycle of battery-driven car and battery electric quantity selects to enter different energy models, wherein: enter the electric quantity consumption pattern when during low speed starting operating mode or at the uniform velocity cruising condition and accelerating mode and battery electric quantity are higher than predetermined value SOC_lim, control motor and drive car load with predetermined power, only have just to start mileage adder when the car load demand power during higher than described motor predetermined power and be the battery charging; Enter electric weight when at the uniform velocity cruising condition and accelerating mode and battery electric quantity are equal to or less than lower limit SOC_lim_low and keep pattern, the work of controlling mileage adder remains in preset range SOC_lim_low~SOC_lim_high the electric weight of battery; Deceleration and damped condition and battery electric quantity enter the mechanical braking pattern when equaling higher limit SOC_max; Deceleration and damped condition and battery electric quantity enter the regenerative brake pattern during lower than higher limit SOC_max; In described electric quantity consumption pattern, controlling battery-driven car according to the selection of chaufeur enters long apart from mode of operation or dynamic work pattern or economy mode of operation, in its middle and long distance mode of operation, utilize motor to drive car load with the pre-fixed length of battery apart from optimizing power P_Batt_opl, when car load demand power P_req, starts mileage adder and is the battery charging during apart from optimizing power P_Batt_opl greater than the pre-fixed length of battery; In the dynamic work pattern, utilize motor to drive car load with car load demand power P_req,, start mileage adder and be the battery charging during greater than the maximum discharge power P_Batt_max of license of battery as car load demand power P_req; In the economy mode of operation, utilize motor to drive car load with the predetermined economy optimizing power P_Batt_opj of battery,, start mileage adder and be the battery charging during greater than the predetermined economy optimizing power P_Batt_opj of battery as car load demand power P_req; Described pre-fixed length is apart from optimizing power P_Batt_opl≤predetermined economy optimizing power P_Batt_opj<maximum discharge power P_Batt_max of license.
2. the energy management method of extended-range electric vehicle according to claim 1, it is characterized in that in described regenerative brake pattern, if acceleration pedal and brake pedal are not all stepped on, enter F/s regenerative brake pattern, brake pedal is stepped on if acceleration pedal is not stepped on, and enters subordinate phase regenerative brake pattern; The brake power generating moment of torsion of described F/s regenerative brake pattern is less than the brake power generating moment of torsion of subordinate phase regenerative brake pattern.
3. the energy management method of extended-range electric vehicle according to claim 1 and 2, it is characterized in that described length is apart from mode of operation, when the car load demand power greater than the pre-fixed length of battery during apart from optimizing power P_Batt_opl, control mileage adder take predetermined length apart from optimizing power P_RE_opl as the battery charging; In described dynamic work pattern, during greater than the maximum discharge power P_Batt_max of the license of battery, control mileage adder take predetermined dynamic property optimizing power P_RE_opD as the battery charging as car load demand power P_req; In described economy mode of operation, during greater than the predetermined economy optimizing power P_Batt_opj of battery, control mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging as car load demand power P_req; Described length is apart from optimizing power P_RE_opl≤predetermined economy optimizing power P_Re_opj<predetermined dynamic property optimizing power P_RE_opD.
4. the energy management method of extended-range electric vehicle according to claim 3, it is characterized in that described electric weight keeps in pattern, when battery electric quantity is equal to or less than the lower limit SOC_lim_low of preset range or car load demand driving power P_req during greater than predetermined value P_pre, starts mileage adder and be the battery charging; During less than or equal to predetermined value P_pre, close mileage adder higher than the higher limit SOC_lim_high of preset range and car load demand driving power P_req when battery electric quantity, described predetermined value P_pre equals the maximum discharge power of battery.
5. the energy management method of extended-range electric vehicle according to claim 4, it is characterized in that described electric weight keeps in pattern, control mileage adder take maximum power P_RE max work as the battery charging when battery electric quantity is equal to or less than lower limit SOC_low_BattSafe and drive car load, otherwise controlling mileage adder take predetermined economy optimizing power P_Re_opj as the battery charging.
CN 201110126665 2011-05-17 2011-05-17 Energy management method for stroke-increased electric motor car CN102267453B (en)

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