CN102358202B - Method for controlling switchover of electric automobile storage batteries - Google Patents
Method for controlling switchover of electric automobile storage batteries Download PDFInfo
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- CN102358202B CN102358202B CN2011102606953A CN201110260695A CN102358202B CN 102358202 B CN102358202 B CN 102358202B CN 2011102606953 A CN2011102606953 A CN 2011102606953A CN 201110260695 A CN201110260695 A CN 201110260695A CN 102358202 B CN102358202 B CN 102358202B
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Abstract
The invention discloses a method for controlling switchover of electric automobile storage batteries, which comprises the following steps of: firstly, determining a driving mode, i.e. a driving state of an electric automobile according to an accelerator, a brake and current automobile speed; secondly, calculating an operating threshold value of a storage battery SOC required by the electric automobile according to the driving mode of the electric automobile; and finally, the storage batteries are switched over according to the operating threshold value of the storage battery SOC required by the electric automobile and SOC of the current two groups of storage batteries. Therefore, the use of the storage batteries is optimized, the service efficiency of energy of the storage batteries is improved, sufficient electric energy supply can be ensured when the electric automobile needs larger energy, better driving performance of the electric automobile is ensured, and simultaneously, the driving range of the electric automobile is effectively prolonged.
Description
Technical field
The invention belongs to batteries of electric automobile power supply technique field, more specifically say, relate to a kind of method for controlling switchover of electric automobile storage batteries.
Background technology
Outstanding day by day along with the enhancing of global environmental consciousness and energy problem, electronlmobil has become the topmost developing direction of Green Vehicle.Along with becoming increasingly conspicuous of the problems such as the development of society and the energy, environmental protection, pure electric automobile more and more is subject to the attention of countries in the world with its zero-emission, low noise and other advantages, and the electronlmobil related industry has become the developing direction of 21 century automobile industry.Developing rapidly of electronlmobil, more and more higher to the requirement of battery power, energy-storage battery related application technology is one of bottleneck of restriction Development of Electric Vehicles at present.
Electronlmobil due to the constraint that is subject to self-condition and battery management mode, adopts the mode of a group storage battery to power mostly at present.But it is not good enough to adopt single group storage battery to provide the design of energy to show on functional redundancy to electronlmobil, will affect the normal operation of electronlmobil when relevant power equipment supply breaks down.In addition, adopt single group storage battery power supply, when the energy of this group storage battery storage is less, can not guarantee the driving performances such as electronlmobil startup, acceleration, and under this kind power supply mode, electronlmobil can not effectively utilize storage battery energy, has limited the maximum range of electronlmobil
For improving electronlmobil to the antijamming capability of complex environment, two group storage batteries provide the mode of energy more and more to be subject to people's concern and attention to electronlmobil.
In the situation that two group storage battery power supplies, if simply with a group storage battery as working power, an other group storage battery uses as backup power, the service efficiency of storage battery energy is lower, the battery-driven car travelled distance is relatively short, and the driving performance of electronlmobil is also relatively poor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method for controlling switchover of electric automobile storage batteries is provided, two group storage batteries are coordinated to electronlmobil energy is provided, to optimize the use of storage battery, its energy service efficiency is provided, effectively extend the electric automobile during traveling mileage, guarantee that simultaneously electronlmobil has driving performance preferably.
For achieving the above object, method for controlling switchover of electric automobile storage batteries of the present invention is characterized in that, comprises the following steps:
(1), calculate electronlmobil expectation acceleration/accel, then definite electronlmobil current driving operating mode according to throttle, current vehicle speed;
Start operating performance: electronlmobil expectation acceleration/accel is greater than accelerating setting value, and the electronlmobil current vehicle speed is less than the toggle speed setting value;
Accelerating mode: electronlmobil expectation acceleration/accel is greater than accelerating setting value, and the electronlmobil current vehicle speed is greater than the toggle speed setting value;
Level and smooth driving cycle: electronlmobil expectation acceleration/accel is less than accelerating setting value, and the electronlmobil current vehicle speed is greater than the toggle speed setting value;
Damped condition: the electronlmobil current vehicle speed is greater than the toggle speed setting value, and chaufeur sends brake signal, and electronlmobil moves with deceleration/decel;
The parking operating mode: the electronlmobil current vehicle speed is less than the toggle speed setting value, and electronlmobil expectation acceleration/accel is less than accelerating setting value;
(2) according to current Electric Vehicles Driving Cycle, calculate the required storage battery SOC of electronlmobil (State Of Charge, battery charge state) work threshold value;
Start and accelerating mode under, take electronlmobil expectation acceleration/accel as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, and with this as the threshold value of working;
Under level and smooth driving cycle; Take speed as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, with this as the work threshold value;
Under braking and parking operating mode, the work threshold value is set as the discharge limit value of storage battery SOC;
(3), the storage battery SOC work threshold value required according to electronlmobil and the SOC of current two group storage batteries select storage battery and switch:
As the work storage battery, another group storage battery is as standby battery with a group storage battery;
3.1), starting, under accelerating mode, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, providing energy by the work storage battery to electronlmobil; When work storage battery SOC does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
3.2), under level and smooth driving cycle, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, provide energy by the work storage battery to electronlmobil; When the SOC of work storage battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
3.3), under braking and parking operating mode, allow discharge at the lower storage battery of SOC, satisfy the required storage battery SOC work threshold value of electronlmobil under this driving cycle, use the lower storage battery of SOC to provide energy to electronlmobil.
Goal of the invention of the present invention is achieved in that
At first method for controlling switchover of electric automobile storage batteries of the present invention according to throttle, brake and current vehicle speed, determines Electric Vehicles Driving Cycle, the state of namely driving a vehicle; Then, according to the electronlmobil operating condition, calculate the required storage battery SOC work threshold value of electronlmobil; The last storage battery SOC work threshold value required according to electronlmobil and the SOC of current two group storage batteries switch storage battery.Optimized like this use of storage battery, improved the service efficiency of its energy, can guarantee that electronlmobil is when the larger energy of needs, there are enough electric energy to supply with, guaranteed that electronlmobil has driving performance preferably, simultaneously, effectively extended the electric automobile during traveling mileage.
Description of drawings
Fig. 1 is the system chart of accumulator of electric car changing method of the present invention practical application;
Fig. 2 is this electronlmobil when not using method for controlling switchover of electric automobile storage batteries of the present invention, the diagram of curves of the parameters of measuring in real time by the circulation road conditions;
This electronlmobil of Fig. 3 after using method for controlling switchover of electric automobile storage batteries of the present invention, the diagram of curves of the parameters of measuring in real time by the circulation road conditions.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need to point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Embodiment
Fig. 1 is the system chart of accumulator of electric car changing method of the present invention practical application.
In the present embodiment, as shown in Figure 1, battery car accumulators store system has increased by a group storage battery, and namely the second group storage battery is as the power resources of electronlmobil, and as the work storage battery, the second Battery pack is as standby battery with the first group storage battery.Can select and switch two group storage batteries according to driving cycle and the remaining electric weight of two group storage batteries of electronlmobil, the remaining electric weight of storage battery obtains by the SOC that measures storage battery, thereby make the energy that every group storage battery comprises to discharge fully and to offer the electronlmobil use, make electronlmobil can extend travelled distance under identical storage battery equipment, guarantee the electronlmobil driving performance.
In the present embodiment, as shown in Figure 1, the system of method for controlling switchover of electric automobile storage batteries practical application comprises three parts, and the operating mode of namely travelling judge module, work threshold calculation module and storage battery are selected handover module.
The accumulator of electric car handover control system gathers chaufeur throttle, brake, current vehicle speed signal by the driving cycle judge module, then judges and definite electronlmobil current driving operating mode.After definite electronlmobil current driving operating mode, calculate the required storage battery SOC of electronlmobil (State Of Charge, battery charge state) work threshold value in the work threshold calculation module.The scope of SOC value is 0-1, and the expression battery remaining power accounts for the ratio of battery full capacity.Last storage battery selects the handover module storage battery SOC work threshold value required according to electronlmobil and the SOC of current two group storage batteries storage battery is selected and switched, select rational storage battery and provide energy for electronlmobil, drive target to satisfy chaufeur.
In the present invention, according to the running state of electronlmobil designed startup, acceleration, five driving cycles that smoothly travel, brake, stop, each operating mode definition and being described as follows:
Start operating performance: under this operating mode, the electronlmobil current vehicle speed is less than the toggle speed setting value, and chaufeur has larger acceleration/accel demand, and at this moment, electronlmobil expectation acceleration/accel is greater than accelerating setting value;
Accelerating mode: under this operating mode, the electronlmobil current vehicle speed is greater than the toggle speed setting value, and chaufeur has larger acceleration/accel demand simultaneously, and at this moment, electronlmobil expectation acceleration/accel is greater than accelerating setting value;
Level and smooth driving cycle: under this operating mode, the electronlmobil current vehicle speed is greater than the toggle speed setting value, and chaufeur does not have brake signal, and the electronlmobil speed of a motor vehicle changes less, and electronlmobil expectation acceleration/accel is less than accelerating setting value;
Damped condition: under this operating mode, the electronlmobil current vehicle speed is greater than the toggle speed setting value, and chaufeur sends brake signal, and electronlmobil moves with deceleration/decel;
The parking operating mode: under this operating mode, the electronlmobil current vehicle speed is less than the toggle speed setting value, and chaufeur do not have the acceleration/accel demand, i.e. electronlmobil expectation acceleration/accel is 0.
Above electronlmobil current driving operating mode, driving cycle judge module calculate electronlmobil expectation acceleration/accel according to throttle, current vehicle speed and determine.
After determining current Electric Vehicles Driving Cycle, need with that to calculate the required storage battery SOC of electronlmobil (State Of Charge, battery charge state) work threshold value.The storage battery SOC that energy only is provided is during higher than the required storage battery SOC work threshold value of electronlmobil, the driving performance under this operating mode of guarantee electronlmobil.The calculating of the required storage battery SOC of the electronlmobil under various driving cycles work threshold value and being described as follows:
Under startup and accelerating mode, chaufeur needs electronlmobil with larger acceleration operation, therefore, take electronlmobil expectation acceleration/accel as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, with this as the work threshold value;
Under level and smooth driving cycle, although chaufeur does not need electronlmobil with larger acceleration operation, but in order to guarantee the driving performance of electronlmobil when the high speed, take speed as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, with this as the work threshold value under level and smooth driving cycle.
Under braking and parking operating mode, do not need storage battery that larger energy is provided, at this moment the energy that provides of storage battery mainly offers vehicle-mounted accessory equipment, and the work threshold value is set as the discharge limit value of storage battery SOC.
The required storage battery SOC work threshold value of above electronlmobil is calculated by the work threshold calculation module.
Obtaining the required storage battery SOC work threshold value of electronlmobil, storage battery selects the handover module storage battery SOC work threshold value required according to electronlmobil and the SOC of current two group storage batteries storage battery is selected and switched, select rational storage battery and provide energy for electronlmobil, drive target to satisfy chaufeur, concrete selection and being described as follows:
1), under startup, accelerating mode, storage battery need to provide higher energy to satisfy the larger acceleration/accel demand of chaufeur to electronlmobil, at this moment, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, provide energy by the work storage battery to electronlmobil; When work storage battery SOC does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
2), under level and smooth driving cycle, the energy that storage battery provides should satisfy the speed requirement of chaufeur, at this moment, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, provide energy by the work storage battery to electronlmobil; When the SOC of work storage battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
3), under braking and parking operating mode, storage battery is mainly the vehicle-mounted accessory equipments such as air-conditioning energy is provided, the storage battery lower at SOC allows discharge, satisfies the required storage battery SOC work threshold value of electronlmobil under this driving cycle, uses the lower storage battery of SOC to provide energy to electronlmobil.
Like this, selection and switchover policy according to above-mentioned storage battery, can guarantee that electronlmobil is when the larger energy of needs, there are enough electric energy to supply with, improved the service efficiency of storage battery energy, guaranteed that electronlmobil has driving performance preferably, simultaneously, effectively extended the electric automobile during traveling mileage.
In the present embodiment, due to over discharge, storage battery is damaged, affects service lifetime of accumulator in order to prevent storage battery, the SOC of storage battery is carried out Real Time Monitoring and sets the discharge restriction.When the energy in storage battery reduced to that outwards the boundary provides energy again, when namely the SOC of storage battery dropped to the battery discharge limit value, this storage battery no longer provided energy.
Example
Method for controlling switchover of electric automobile storage batteries of the present invention is applied to a concrete electronlmobil tests, the electronlmobil design parameter is as shown in table 1:
Table 1
In example, two group storage battery SOC initial values are 0.7, and battery discharge SOC limit value is 0.15, and accelerating setting value under startup and accelerating mode is 0.4m/s
2, starting speed of a motor vehicle setting value is 8Km/h.
1, electronlmobil current driving operating mode judgement
Be 0.4m/s at electronlmobil expectation acceleration/accel greater than accelerating setting value
2Situation under, if current vehicle speed thinks that less than starting the speed of a motor vehicle setting value 8Km/h electronlmobil is in start operating performance; If current vehicle speed thinks that greater than starting the speed of a motor vehicle setting value 8Km/h electronlmobil is in accelerating mode.
Expect that at electronlmobil acceleration/accel is less than accelerating setting value 0.4m/s
2Situation under, if current vehicle speed greater than starting speed of a motor vehicle setting value 8Km/h, is thought that electronlmobil is current and is in level and smooth driving cycle.
Chaufeur sends brake signal, and electronlmobil moves with deceleration/decel, if the electronlmobil current vehicle speed greater than toggle speed setting value 8Km/h, is thought the current damped condition that is in of electronlmobil;
Expect that at electronlmobil acceleration/accel is less than accelerating setting value 0.4m/s
2Situation under, if current vehicle speed thinks that less than starting the speed of a motor vehicle setting value 8Km/h electronlmobil is in the parking operating mode.
Fig. 2 is for this electronlmobil when not using method for controlling switchover of electric automobile storage batteries of the present invention, the diagram of curves of the parameters of measuring in real time by the circulation road conditions.In this suite line chart, transverse axis all means the running time of electronlmobil: the picture left above is the SOC diagram of curves of the first group storage battery, expression is along with the SOC of increase the first group storage battery of electric automobile during traveling time changes, as seen from Figure 2 in 0～5200s, electronlmobil adopts the first group storage battery that energy is provided, and the SOC value of the first group storage battery constantly descends until reach discharge limit value 0.15; Lower-left figure is the SOC diagram of curves of the second group storage battery, expression is along with the SOC of increase the second group storage battery of electric automobile during traveling time changes, can find out front 5200s at electric automobile during traveling by this diagram of curves, the SOC of the second group storage battery does not reduce, and expression the second group storage battery begins to provide energy to electronlmobil separately after the first group storage battery depleted of energy.Top right plot be in motion between in the variation of electronlmobil speed, can see that the moving velocity maximum can reach 100km/h in the process of moving, and exist a plurality of accelerators.Bottom-right graph represents the travelled distance of this type electronlmobil, and this type electronlmobil is in the situation that depleted of energy, and running time is 9000s, and travelled distance is 165.5km.
Fig. 3 is this electronlmobil after using method for controlling switchover of electric automobile storage batteries of the present invention, the diagram of curves of the parameters of measuring in real time by the circulation road conditions.This battery handover control system alternately provides energy according to the battery pack of electronlmobil driving cycles and two group storage battery SOC condition selecting optimums to electronlmobil.transverse axis all means the running time of electronlmobil in this suite line chart: in Fig. 3, (a) is the first group storage battery, namely the work SOC diagram of curves of storage battery, expression is along with the SOC of the increase work storage battery of electric automobile during traveling time changes, as seen from Figure 3 along with the increase of the running time of electronlmobil, the SOC value of work storage battery is constantly descending until reach discharge limit value 0.15, because the employing of method for controlling switchover of electric automobile storage batteries of the present invention, drop to the work threshold value of startup and accelerating mode at the SOC of work storage battery, after SOC is about 0.4, the SOC descending speed of this group storage battery obviously slows down, show another group, be that standby battery begins to participate in providing of energy.Can find that from Fig. 3 the SOC of work storage battery is in some time period, as keeping constant near 3200s, 4600s, 6000s etc., this is illustrated in, and in these time periods, the work storage battery does not provide energy to electronlmobil, standby battery is as energy source, and this moment, standby battery SOC had obvious decline in these time periods.Method for controlling switchover of electric automobile storage batteries provides energy according to the battery pack of electronlmobil current driving operating mode and storage battery SOC condition selecting optimum.in Fig. 3, (c) is the second group storage battery, it is the SOC diagram of curves of standby battery, expression is along with the SOC of the increase standby battery of electric automobile during traveling time changes, can find out front 3200s at electric automobile during traveling by this diagram of curves, the SOC of standby battery does not reduce, the expression standby battery does not during this period of time provide energy to electronlmobil, its reason is to work the SOC value of storage battery greater than each driving cycle work threshold value this moment, the energy that the work storage battery provides can satisfy the demand under each driving cycle, the storage battery handover control system does not have the cut-in stand-by battery provides energy by it.Increase along with the electric automobile during traveling time, when the SOC value of work storage battery lower than starting and the SOC of the required storage battery of accelerating mode electronlmobil when working threshold value, select and switch to standby battery and provide energy to electronlmobil, this moment, standby battery SOC value began to reduce, this be illustrated in start and the operating modes such as acceleration under when the larger energy requirement of electronlmobil proposition, provide energy to satisfy the driving demand by the higher standby battery of energy.When the driving cycle of the less energy requirement such as braking, parking, the work storage battery lower by energy provides energy, so not only satisfy the chaufeur demand but also can not cause the waste of energy, when work storage battery SOC value is low to moderate limit value 0.15, the work storage battery will lose the power supply capacity to electronlmobil, separately to the electronlmobil power supply, can see that the SOC descending speed of standby battery accelerates this moment by standby battery.In Fig. 3 (b) be in motion between in the variation of electronlmobil speed, can see that the moving velocity maximum can reach 100km/h in the process of moving, and exist a plurality of accelerators.By (d) in Fig. 3 as can be known, the running time of electronlmobil is about 10000s (2 hours 45 minutes), and its travelled distance reaches 179.1km at last along with the continuous increase of being increased in of time.In Fig. 3 (e), (f) be electronlmobil in the driving process of 7100s to 7200s, namely in Fig. 3 in (a) near C point, the SOC change curve of two group storage batteries, visible two group storage batteries alternately provide energy to electronlmobil.with a few width figure combinations in Fig. 3, arrive 400s at electric automobile during traveling, namely in figure during the A point, once accelerate demand, require the speed of a motor vehicle to rise to 100km/h by 0km/h, and travel a period of time with the rate smoothing of 90km/h, this driving procedure needs battery to provide larger energy to electronlmobil, the storage battery SOC that works this moment is higher, can satisfy chaufeur and drive demand, after the work storage battery provides energy, SOC significantly decreases, drop to 0.60 by 0.67, storage battery SOC is higher because work this moment, standby battery does not provide energy to electronlmobil, its SOC value does not change, remain on 0.70, in the braking procedure of 0km/h, the work storage battery relatively low by present energy provides at subsequently 100km/h, arrive 3200s at electric automobile during traveling, in figure during the B point, chaufeur has proposed once same acceleration demand, require the speed of a motor vehicle to rise to 100km/h by 0km/h, and travel a period of time with the rate smoothing of 90km/h, threshold calculation module calculates the SOC of storage battery lower than starting and accelerating mode work threshold value but work this moment, i.e. 0.4 left and right, can not satisfy the target under the current driving operating mode, provide higher energy to satisfy the chaufeur demand by standby battery, the storage battery of working this moment does not as seen from Figure 3 provide energy to electronlmobil, its SOC maintains 0.38 left and right.Standby battery after process provides energy for this reason SOC significantly decrease, its SOC drops to 0.64 by 0.70, at subsequently 100km/h in the braking procedure of 0km/h, because braking procedure needs energy less, therefore the work storage battery relatively low by energy provides, this moment, standby battery did not provide energy, and its SOC maintains 0.64 left and right; Arrive 8000s at electric automobile during traveling, when in figure, the C point is neighbouring, electronlmobil has a plurality of startups, acceleration and damped condition, select storage battery that energy is provided according to driving operating mode and two group storage battery SOC, use the higher standby battery of energy that energy is provided when starting and accelerate, use the lower work storage battery of energy that energy is provided when braking and parking, two group storage batteries alternately provide energy to electronlmobil; Simulate 9500s at electronlmobil, when in figure, the D point was neighbouring, work storage battery SOC had dropped to the discharge limit value, is the protection battery, and forbid that working battery provides energy this moment, and adopt standby battery to provide energy to electronlmobil separately.Work storage battery, standby battery provide energy to electronlmobil by method for controlling switchover of electric automobile storage batteries of the present invention under different driving cycles, realizing the driving target of chaufeur, and reach the target of optimization energy service efficiency.By Fig. 2,3 as can be known, due to the employing of method for controlling switchover of electric automobile storage batteries of the present invention, effectively extend the travelled distance of electronlmobil, satisfy chaufeur and drive demand.
Table 2 is use and do not use method for controlling switchover of electric automobile storage batteries electronlmobil acceleration capability contrast simulation result of the present invention.
Table 2
In table 2, work storage battery SOC initial value is 0.3, and standby battery SOC initial value is 0.7.
Do not use the electronlmobil of method for controlling switchover of electric automobile storage batteries of the present invention first to use the work storage battery, then its SOC reach discharge and use standby battery after limit value.find by test result, use method for controlling switchover of electric automobile storage batteries of the present invention at three velocity shooting 0～50km/h, the pick-up time of 50～80km/h and 0～100km/h is compared and is not used method for controlling switchover of electric automobile storage batteries electronlmobil of the present invention all to improve, be respectively 10.3%, 11.5% and 11.1%, this is because after electronlmobil use method for controlling switchover of electric automobile storage batteries of the present invention, can when proposing higher energy requirement, use chaufeur the higher battery pack of SOC, satisfy the instantaneous high-power demand of chaufeur, reached the purpose that shortens pick-up time, guaranteed the driving performance of electronlmobil.
Table 3 is use and do not use method for controlling switchover of electric automobile storage batteries electronlmobil contrast test result.Carried out test experiments under high-speed circulating road conditions (HWFET), expressway circulation road conditions (US06), city circulation road conditions (UDDS).
Table 3
By as seen from Table 3, under each test road conditions, use the electronlmobil of method for controlling switchover of electric automobile storage batteries to use the method for controlling switchover of electric automobile storage batteries electronlmobil more excellent on performance, starting frequently under city circulation road conditions, can use better storage battery energy especially.Electronlmobil can reduce the energy expenditure rate of electronlmobil, and can extend the travelled distance of electronlmobil after using method for controlling switchover of electric automobile storage batteries of the present invention.
Although the above is described the illustrative specific embodiment of the present invention; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of the specific embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (2)
1. a method for controlling switchover of electric automobile storage batteries, is characterized in that, comprises the following steps:
(1), calculate electronlmobil expectation acceleration/accel, then definite electronlmobil current driving operating mode according to throttle, current vehicle speed;
Start operating performance: electronlmobil expectation acceleration/accel is greater than accelerating setting value, and the electronlmobil current vehicle speed is less than the toggle speed setting value;
Accelerating mode: electronlmobil expectation acceleration/accel is greater than accelerating setting value, and the electronlmobil current vehicle speed is greater than the toggle speed setting value;
Level and smooth driving cycle: electronlmobil expectation acceleration/accel is less than accelerating setting value, and the electronlmobil current vehicle speed is greater than the toggle speed setting value;
Damped condition: the electronlmobil current vehicle speed is greater than the toggle speed setting value, and chaufeur sends brake signal, and electronlmobil moves with deceleration/decel;
The parking operating mode: the electronlmobil current vehicle speed is less than the toggle speed setting value, and electronlmobil expectation acceleration/accel is less than accelerating setting value;
(2) according to current Electric Vehicles Driving Cycle, calculate the required storage battery SOC(State OfCharge of electronlmobil, battery charge state) the work threshold value; And the SOC of storage battery is carried out Real Time Monitoring and sets the discharge limit value;
Start and accelerating mode under, take electronlmobil expectation acceleration/accel as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, and with this as the threshold value of working;
Under level and smooth driving cycle, take speed as demand parameter, calculate power demand, calculate by the storage battery related algorithm storage battery of this power SOC can be provided, with this as the work threshold value;
Under braking and parking operating mode, the work threshold value is set as the discharge limit value of storage battery SOC;
(3), the storage battery SOC work threshold value required according to electronlmobil and the SOC of current two group storage batteries select storage battery and switch:
As the work storage battery, another group storage battery is as standby battery with a group storage battery;
3.1), starting, under accelerating mode, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, providing energy by the work storage battery to electronlmobil; When work storage battery SOC does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
3.2), under level and smooth driving cycle, when work storage battery SOC satisfies the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, provide energy by the work storage battery to electronlmobil; When the SOC of work storage battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, and the SOC of standby battery selects and switches to standby battery and provide energy to electronlmobil when satisfying; When the SOC of work storage battery and standby battery does not satisfy the required storage battery SOC work threshold value of electronlmobil under the current driving operating mode, select and switch to the higher storage battery of SOC and provide energy to electronlmobil;
3.3), under braking and parking operating mode, allow the lower battery discharging of SOC, satisfy the required storage battery SOC work threshold value of electronlmobil under this driving cycle, use the lower storage battery of SOC to provide energy to electronlmobil.
2. method for controlling switchover of electric automobile storage batteries according to claim 1, is characterized in that, when the SOC of storage battery dropped to the battery discharge limit value, this storage battery no longer provided energy.
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| CN108313049B (en) * | 2013-02-08 | 2021-06-08 | 高效动力传动系统公司 | System and method for implementing dynamic operating modes and control strategies for hybrid vehicles |
| CN108263222B (en) | 2016-12-30 | 2021-10-15 | 蔚来(安徽)控股有限公司 | Method and device for determining replacement utility of battery pack of electric vehicle |
| CN109318725A (en) * | 2018-08-06 | 2019-02-12 | 武汉华科福赛新能源有限责任公司 | Stroke-increasing electric automobile and increasing Cheng Fangfa based on solid oxide fuel cell |
| CN113178921A (en) * | 2021-05-12 | 2021-07-27 | 中国第一汽车股份有限公司 | Control method, device, equipment and storage medium |
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