CN102381309B - Speed regulation and management method for range extender of electric car - Google Patents
Speed regulation and management method for range extender of electric car Download PDFInfo
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Abstract
The invention provides a speed regulation and energy management method for range extender of electric car which satisfies with both drive ability and economy of the whole car, when capacity of a power battery is lower than a start threshold, the range extender starts automatically for providing energies to the power battery, a low-voltage battery set and a drive motor; or when request power of a driver is larger than energy capable of being provided by the power battery, the extender starts; after the extender starts, a corresponding revolving speed level is entered according to the request power; according to fuel oil consumption curve and emission curve of the motor, working revolving speed range of the motor is determined, several revolving speed levels are selected in the working revolving speed range of the motor are selected, and powers of the range extender which are corresponded to the revolving speed levels are required to cover requirements for dynamic characteristic of the whole car; then corresponding signals are decoupled via controller of the whole car for being sent to a motor controller and a generator controller. Then the speed regulation and energy management of the range extender satisfy with both drive ability and economy of the whole car.
Description
Technical field
The present invention relates to the control technology for electric motor car field, be specifically related to a kind of electric car travel increasing device speed governing and management process.
Background technology
Traditional pure electric vehicle is due to the defect of electrokinetic cell energy density, and insufficient driving range becomes the obstacle of traditional pure electric vehicle marketing.The distance increasing unit battery-driven car has increased and has increased Cheng Danyuan by what driving engine and electrical generator formed on traditional electrical motor-car basis, actv. has made up the defect of traditional electrical motor-car insufficient driving range.Extended-range electric vehicle is the product of traditional combustion engine car, pure electric vehicle combination, except the characteristics with traditional electrical motor-car, also has following characteristics:
1, high fuel utilization ratio.Distance increasing unit is except of short duration being operated in idle speed zone, and the most of the time is operated in economic zone, has improved fuel utilization ratio;
2, increase continual mileage.If the electrokinetic cell electric weight is on the low side, when the request of driving was larger, distance increasing unit started automatically, met the car load load and drove the demand of asking;
3, good man-machine interaction.Chaufeur can start by the mandatory requirement distance increasing unit, meets different driving demands.Such as: can be power battery charging at city suburbs force start distance increasing unit, for blocking up, travelling of noisy city provides enough electric energy.
The control of distance increasing unit is important part during car load is controlled, and it controls the economy that whether rationally has influence on car load, dynamic property and NVH.How to make the rotating speed of distance increasing unit adapt to the requirements such as instant request power, engine fuel curve, emissions profile of car load to meet the performance figure requirement that car load driving and economy are distance increasing units.
Summary of the invention
The objective of the invention is to propose a kind of electric car travel increasing device speed governing and energy management method that meets simultaneously car load driving and economy.
According to electric car travel increasing device speed governing provided by the invention and energy management method, key is that described distance increasing unit comprises driving engine and electrical generator and corresponding engine controller and engine controller, described electrical generator and driving motor of electric vehicle and electrokinetic cell common DC bus and be connected with the A-battery group, described engine controller all is connected with entire car controller with engine controller, when starting threshold values, distance increasing unit starts automatically provides energy for electrokinetic cell, A-battery group and drive motor when the capacity of electrokinetic cell; Or during the energy that can provide greater than electrokinetic cell when the request power of chaufeur, start distance increasing unit; After distance increasing unit starts, according to the size of request power, enter corresponding rotating speed grade: according to engine fuel consumption curve and emissions profile, determine the working speed interval of driving engine, then in this engine operation rotating speed interval, select several rotating speed grades, require the demand of distance increasing unit Power coverage car load dynamic property corresponding to described rotating speed grade; Then by entire car controller, be decoupled into corresponding signal and be sent to respectively engine controller and engine controller.
Electric car travel increasing device speed governing of the present invention and energy management method, distance increasing unit can be by the chaufeur request or is automatically started, after startup, according to the size of request power, select corresponding rotating speed grade interval, because the rotating speed grade interval is to set according to fuel oil consumption curve and the emissions profile of driving engine, and the demand of corresponding distance increasing unit Power coverage car load dynamic property, so distance increasing unit speed governing of the present invention and energy management method just can meet driving and the economy of car load simultaneously.
Described adjacent distance increasing unit power corresponding to distance increasing unit rotating speed grade has certain overlapping region, so just can avoid the frequently switching between the different rotating speeds grade of distance increasing unit rotating speed, affects the car load driving.
Described distance increasing unit has additional the PI controlling unit in the switching process of different rotating speed grades, make distance increasing unit have less overshoot, and quick adjusting is to the rotating speed grade of setting.
The basic torque of described PI controlling unit determines that method is: from the speed governing of high rotating speed grade to the slow speed of revolution grade, basic torque is the minimal torque under this high rotating speed grade; From the speed governing of slow speed of revolution grade to high rotating speed grade, basic torque is the torque peak under this slow speed of revolution grade.Take the rotating speed difference as benchmark, the rotating speed difference is larger, quick adjustment, and the rotating speed difference is less, will reduce overshoot, better to reduce steady state error.
Car load is under same rotating speed grade, when request power changes, by comparing the difference between current time and previous moment load of electrical generation moment of torsion, if this difference, more than or equal to scalar quantity, limits the load of electrical generation moment of torsion.Due to car load, under same rotating speed grade the time, if request power has a greater change the larger variation that rate can cause load torque, so also can affect greatly the distance increasing unit rotating speed.Limit this moment to the load of electrical generation torque gradient, prevents from asking the larger rate of change of power to cause the impact in larger fluctuation and system high pressure loop to distance increasing unit unit rotating speed.
No matter distance increasing unit is automatically start or start according to the chaufeur request, all when engine starting, keeps the idling of a period of time.If distance increasing unit is the request power force start according to chaufeur, when engine starting, keep a period of time idling to meet low-voltage load and electrokinetic cell energy requirement in the idling stage, and driving engine is had than pulsation-free speed carry out the adjusting of speed; And if distance increasing unit is automatic startup, when engine starting, keep a period of time idling mainly in the idling stage, meeting low-voltage load and electrokinetic cell energy requirement.
Described distance increasing unit also is provided with electrokinetic cell protection: degree of closeness and the electrokinetic cell monomer voltage value of the maximum charging voltage value that allows according to d-c bus voltage value and electrokinetic cell are protected monomer voltage higher limit degree of closeness with electrokinetic cell, and the maximum charge power of electrokinetic cell permission is limited.So just can avoid electrokinetic cell to charge under overvoltage and overcurrent condition.
The accompanying drawing explanation
Fig. 1 is application distance increasing unit battery-driven car schematic diagram of the present invention.
Fig. 2 is rotating speed grade classification schematic diagram of the present invention.
Fig. 3 is PI link schematic diagram of the present invention.
Fig. 4 is the inter-stage speed regulation process schematic diagrams such as different rotating speeds of the present invention.
Fig. 5 is distance increasing unit speed regulation process schematic diagram of the present invention.
The specific embodiment
Below contrast accompanying drawing, by the description to embodiment, the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, each several part and annexation, each several part and principle of work etc. are described in further detail.
As Fig. 1, distance increasing unit speed governing of the present invention and energy management method are: distance increasing unit 1 comprises driving engine 2 and electrical generator 3 and corresponding engine controller 4 and engine controller 5, described electrical generator 3 and driving motor of electric vehicle 10 and electrokinetic cell 6 common DC bus and be connected with A-battery group 9, described engine controller 4 all is connected with entire car controller 12 with engine controller 5, when starting threshold values, distance increasing unit 1 starts automatically provides energy for electrokinetic cell 6, A-battery group 9 and drive motor 10 when the capacity of electrokinetic cell 6; Or, start and increase journey 1 device during greater than 6 energy that can provide of electrokinetic cell when the request power of chaufeur; After distance increasing unit 1 starts, according to the size of request power, enter corresponding rotating speed grade: according to driving engine 2 fuel oil consumption curve and emissions profile, determine the working speed interval of driving engine 2, then in these driving engine 2 working speed intervals, select 3 rotating speed grades, require the demand of the Power coverage car load dynamic property of distance increasing unit 1 corresponding to described 3 rotating speed grades; Then by entire car controller 12, be decoupled into corresponding signal and be sent to respectively engine controller 4 and engine controller 5.Consistent with the battery-driven car of prior art, electrokinetic cell 6 is connected with battery management unit 7, and drive motor 10 is connected with electric machine controller 11, and electrical generator 3 is 9 chargings of A-battery group by DCDC8.In the present embodiment, engine controller 4 is connected employing rotating speed interface with entire car controller 12, and engine controller 5 is connected employing moment of torsion interface with entire car controller 12.
A) automatically start: distance increasing unit 1 is in order to reach the purpose that increases continual mileage, when electrokinetic cell 6 electric weight reach the minimum threshold values of protection, driving engine 2 starts, and this moment, distance increasing unit 1 met the request power of car load, for electrokinetic cell 6 and car load load provide energy to drive simultaneously car load, moves ahead; When the larger power of chaufeur request (this power has surpassed the driving power that battery can provide), this moment driving engine 2 automatically request start, meet the dynamic property of driving;
B) force start: distance increasing unit 1 can meet different driving habits, and chaufeur mandatory requirement driving engine 2 starts, and distance increasing unit 1 charged, met the car load loading demand to electrokinetic cell 6 this moment.
The shutdown of distance increasing unit 1 is divided into automatically and two kinds of forms of forced stoppage:
A) auto-stop: when electrokinetic cell 6 electric weight reached the shutdown threshold values, driving engine 2 was shut down.Shut down between threshold values and startup threshold values certain allowance is set, avoid the driving engine frequent starting, cause the decline of fuel utilization ratio;
B) forced stoppage: reached the hope of chaufeur when the engine operation situation, can force to driving engine 2 shutdown signals.Force start and shutdown can complete by the hand push button ON/OFF on console, realize good man-machine interaction.
The power of the distance increasing unit 1 that the rotating speed grade of described adjacent distance increasing unit 1 is corresponding has certain overlapping region, so just can avoid rotating speed frequently switching between the different rotating speeds grade of distance increasing unit 1, affects the car load driving.Under different rotating speed grades, set the power range (correspondence has a torque range (tqmin_ grade x, tqmax_ grade x)) of distance increasing unit 1, require power between different rotating speed grades that certain overlapping region is arranged, as Fig. 2.According to the power range under the different rotating speeds grade, can determine the scope of moment of torsion.Through vehicle speed signal, can revise the rotating speed grade of distance increasing unit 1, the speed of a motor vehicle is higher, and wind is made an uproar larger, and can allow driving engine 2 be operated in high rotating speed grade this moment, realizes higher power regulating range and better fuel economy.
Described distance increasing unit 1 has additional the PI controlling unit in the switching process of different rotating speed grades:
If the maximum power that request power can provide greater than current rotating speed grade, keep the maximum generation moment of torsion under current rotating speed grade, promote the rotating speed grade of rotating speed to request power place.This moment, engine speed there will be (making progress) overshoot, caused driving engine 2 rotating speeds that fluctuation is arranged, and in order to allow driving engine 2 response appointment rotating speed fast, increased the PI controlling unit, as Fig. 3, regulated power generation torque, made driving engine 2 rotational speed quick regulatings to the rotating speed grade of setting.It in this process, is no longer permanent moment of torsion speed regulation process.After rotating speed has reached setting rotating speed grade according to requested torque and rotating speed level adjustment power generation torque.
If the minimum power that request power can provide less than current rotating speed grade, keep the minimum power generation torque under current rotating speed grade, reduce the rotating speed grade of rotating speed to request power place.This moment, (downwards) overshoot may appear in driving engine 2 rotating speeds, had affected the speed stability of driving engine 2, introduced the PI controlling unit, as Fig. 3, regulated the load of electrical generation moment of torsion, made distance increasing unit 1 have less overshoot, and quick adjusting is to the rotating speed grade of setting.After the rotating speed grade that reaches request, according to requested torque and rotating speed grade, change power generation torque.The speed regulation process of the inter-stages such as different rotating speeds such as Fig. 4.The speed regulation process of whole system such as Fig. 5.
The basic torque of described PI controlling unit determines that method is: from the speed governing of high rotating speed grade to the slow speed of revolution grade, basic torque is the minimal torque under this high rotating speed grade; From the speed governing of slow speed of revolution grade to high rotating speed grade, basic torque is the torque peak under this slow speed of revolution grade.Take the rotating speed difference as benchmark, the rotating speed difference is larger, quick adjustment, and the rotating speed difference is less, will reduce overshoot, better to reduce steady state error.As Fig. 4, PI link P coefficient is tabled look-up and is obtained Kp through speed discrepancy, and the rotating speed difference is larger, with larger Kp value, quick adjustment; Along with diminishing of rotating speed difference, the Kp value with less, reduce overshoot.But the I coefficient is scalar quantity Ki, reduces steady state error, better is stable at the rotating speed grade of setting.
No matter distance increasing unit 1 is automatically start or start according to the chaufeur request, all when driving engine 2 starts, keeps the idling of a period of time.Driving engine 2 Starting mode exist to be forced, automatic two kinds of modes, and the purpose under two kinds of Starting mode is different.When driving engine 2 force start, the main purpose of distance increasing unit 1 is to electrokinetic cell 6 charging and remains the energy supply of low-voltage load, and driving engine 2 is while automatically starting, this moment, the Main Function of distance increasing unit 1 was the driving request that meets chaufeur, in addition, distance increasing unit 1 also will meet electrokinetic cell and low-voltage load energy requirement.If distance increasing unit 1 is the request power force start according to chaufeur, when driving engine 2 starts, keep a period of time idling can meet in the idling stage energy requirement of low-voltage load and electrokinetic cell 6, and driving engine 2 is had than pulsation-free speed carry out the adjusting of speed; And if distance increasing unit 1 is automatic startup, when starting, driving engine 2 keep a period of time idling mainly in the idling stage, meeting the energy requirement of low-voltage load and electrokinetic cell 6.
Described distance increasing unit 1 also is provided with the protection of electrokinetic cell 6: degree of closeness and the electrokinetic cell 6 monomer voltage values and electrokinetic cell 6 protection monomer voltage higher limit degrees of closeness of the maximum charging voltage value that allows according to d-c bus voltage value and electrokinetic cell 6, limit the maximum charge power of electrokinetic cell 6 permissions.So just can avoid electrokinetic cell 6 to charge under overvoltage and overcurrent condition.
Claims (4)
1. an electric car travel increasing device speed governing and management process, described distance increasing unit comprises driving engine and electrical generator and corresponding engine controller and engine controller, described electrical generator and driving motor of electric vehicle and electrokinetic cell common DC bus and be connected with the A-battery group, described engine controller all is connected with entire car controller with engine controller, when starting threshold values, distance increasing unit starts automatically provides energy for electrokinetic cell, A-battery group and drive motor when the capacity of electrokinetic cell; And during the energy that can provide greater than electrokinetic cell when the request power of chaufeur, start distance increasing unit; After distance increasing unit starts, according to the size of request power, enter corresponding rotating speed grade: according to engine fuel consumption curve and emissions profile, determine the working speed interval of driving engine, in this engine operation rotating speed interval, select several rotating speed grades, require the demand of distance increasing unit Power coverage car load dynamic property corresponding to described rotating speed grade; Then by entire car controller, be decoupled into corresponding signal and be sent to respectively engine controller and engine controller; Adjacent distance increasing unit power corresponding to distance increasing unit rotating speed grade has certain overlapping region; It is characterized in that described distance increasing unit has additional the PI controlling unit in the switching process of different rotating speed grades, the basic torque of described PI controlling unit determines that method is: from the speed governing of high rotating speed grade to the slow speed of revolution grade, basic torque is the minimal torque under this high rotating speed grade; From the speed governing of slow speed of revolution grade to high rotating speed grade, basic torque is the torque peak under this slow speed of revolution grade.
2. electric car travel increasing device speed governing according to claim 1 and management process, it is characterized in that car load is under same rotating speed grade, when request power changes, by comparing the difference between current time and previous moment load of electrical generation moment of torsion, if this difference, more than or equal to scalar quantity, limits the load of electrical generation moment of torsion.
3. electric car travel increasing device speed governing according to claim 1 and 2 and management process, is characterized in that no matter distance increasing unit is automatically start or start according to the chaufeur request, all when engine starting, keeps the idling of a period of time.
4. electric car travel increasing device speed governing according to claim 3 and management process; it is characterized in that described distance increasing unit also is provided with electrokinetic cell protection: degree of closeness and the electrokinetic cell monomer voltage value of the maximum charging voltage value that allows according to d-c bus voltage value and electrokinetic cell are protected monomer voltage higher limit degree of closeness with electrokinetic cell, and the maximum charge power of electrokinetic cell permission is limited.
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| CN103879300A (en) * | 2014-01-08 | 2014-06-25 | 天津清源电动车辆有限责任公司 | Method for controlling range extender of extended-range electric vehicle |
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