CN102778650B - Battery remaining estimating device of electric vehicle - Google Patents
Battery remaining estimating device of electric vehicle Download PDFInfo
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- CN102778650B CN102778650B CN201210139186.XA CN201210139186A CN102778650B CN 102778650 B CN102778650 B CN 102778650B CN 201210139186 A CN201210139186 A CN 201210139186A CN 102778650 B CN102778650 B CN 102778650B
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- residual capacity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A battery remaining estimating device of an electric vehicle is provided. The battery remaining is estimated based on a discharge current value and a voltage value without using a current sensor. The duty ratio corresponding to a handle opening (Th) is set in advance in a duty ratio mapping chart (48), and a current value when a motor (18) is electrified is set in a discharge current mapping chart (49) according to the voltage value designed by the duty ratio. A remaining capacity mapping chart (51) is configured to output the battery remaining based on the current value searched from the discharge current mapping chart (49) and the actually measured voltage value. A full charging amount as the reference value of calculating the remaining capacity is set as the discharge electric energy in advance when the predetermined current value make the discharge voltage when the battery (4) discharges be the predetermined discharge ending voltage. The remaining capacity mapping chart (51)sets the value by subtracting the estimated electrical energy from the full charging amount as the battery remaining, and the estimated electric energy is based on the voltage actually inputted to the motor (18) and the calculated current value passing the discharge current mapping chart (49).
Description
Technical field
The present invention relates to the battery allowance estimation unit of electric vehicle, relate in particular to and can with the voltage and current that motor is supplied with, calculate according to travelling from battery to electric vehicle the battery allowance estimation unit of the electric vehicle of battery allowance.
Background technology
In patent documentation 1, recorded a kind of control device of electric vehicles motor, the control device of this electric vehicles motor possesses: motor drive circuit, and it supplies with the driving voltage PWM modulation from battery to vehicle drive motor, the 1st dutycycle mapping graph, it is set with the 1st dutycycle corresponding to handle operation aperture, the 2nd dutycycle mapping graph, it is about the temperature of motor drive circuit and the speed of a motor vehicle detecting, be set with the 2nd dutycycle, the 2nd dutycycle illustrates when the speed of a motor vehicle is lower than setting value, to follow in the temperature of motor drive circuit and rises and trend that value diminishes, simultaneously, the speed of a motor vehicle is lower, the value in each temperature illustrates less value, and when temperature value of reaching capacity of motor drive circuit, with independently vanishing of the speed of a motor vehicle detecting, above-mentioned control device generates the signal of the information that comprises the less side in the 1st dutycycle and the 2nd dutycycle, driving signal as motor.
[patent documentation 1] TOHKEMY 2007-49785 communique
Conventionally, the surplus display part of battery is set in electric vehicle, when calculating battery allowance, first, the value of the charging current of supplying with in when charging and duration of charging are multiplied each other and obtain full charge volume, then, from described full charge volume, deduct when Vehicle Driving Cycle and discharge current value that while parking discharges from battery.But, in this battery overmeasure computation method, must use the high current sensor of price and storage storer, affected the cost degradation of electric vehicle, so the improvement of this situation becomes problem.
Summary of the invention
The object of the invention is to, a kind of battery allowance estimation unit is provided, this battery allowance estimation unit is not used current sensor just can calculate battery allowance according to electric current and voltage.
For reaching described object, the of the present invention the 1st is characterised in that, the battery allowance estimation unit of electric vehicle has: battery (4), motor (18), it supplies with electric power by described battery (4), produces the driving force of electric vehicle, handle jaw opening sensor (23), it detects being arranged at the operation aperture (Th) of the oil door handle on electric vehicle, dutycycle mapping graph (48), it has preset the magnitude of voltage of supplying with to described motor (18) corresponding to described operation aperture (Th), as the driving dutycycle of motor drive circuit (8), and surplus estimation unit (6), it is using the output voltage of described battery (4) and output current as parameter, calculate the estimation residual capacity of described battery (4), described surplus estimation unit (6) possesses: discharge current mapping graph (49), it corresponding to the dutycycle of setting in described dutycycle mapping graph (48), is set with the current value while switching on to described motor (18) according to the magnitude of voltage of being determined by described dutycycle in advance, and residual capacity mapping graph (51), it is according to current value and magnitude of voltage, preset the residual capacity of battery (4), described surplus estimation unit (6) is configured to: according to the current value (Imap) calculating by described discharge current mapping graph (49) and the actual measurement magnitude of voltage (Vbatt) supplied with to described motor (18), use described residual capacity mapping graph (51) to calculate the residual capacity of described battery (4), preset while making battery (4) electric discharge with predefined current value, discharge electricity amount when sparking voltage becomes predefined electric discharge end voltage is used as full charge volume, described residual capacity mapping graph (51) is set with estimation battery allowance, this estimates the voltage of battery allowance based on the input from described battery (4) to described motor (18) and the current value now calculating by described discharge current mapping graph (49).
In addition, the of the present invention the 2nd is characterised in that, described full charge volume is that average consumed cur-rent and the electric discharge end voltage based on electric vehicle set.
In addition, the of the present invention the 3rd is characterised in that, described residual capacity mapping graph (51) is the current value of the parameter as this residual capacity mapping graph (51) to be carried out to straight line be similar to and generate.
In addition, the of the present invention the 4th is characterised in that, this battery allowance estimation unit possesses the battery allowance display device (7) that residual capacity based on described calculating shows battery allowance, after rigidly connecting energize, open-circuit voltage is considered as to battery allowance, by described battery allowance display device (7), shows battery allowance.
In addition, the of the present invention the 5th is characterised in that, maintains the demonstration based on described open-circuit voltage within the time predetermining.
In addition, the of the present invention the 6th is characterised in that, the magnitude of voltage and the current value that are input to described residual capacity mapping graph are the mean value in the predetermined sample period.
In addition, the of the present invention the 7th is characterised in that, when the displayed value of described battery allowance display device (7) is above than the low predetermined maximum changing amplitude of the residual capacity of latest computed, makes current displayed value slowly be reduced to up-to-date calculated value.
In addition, the of the present invention the 8th is characterised in that, when described motor (18) stops, every through the schedule time, measures open-circuit voltage, with this open-circuit voltage, replaces battery allowance, by described battery allowance display device (7), carries out battery allowance demonstration.
According to the present invention with the 1st feature, by preparing discharge current mapping graph and residual capacity mapping graph in advance, can with current sensor, only not detect the surplus that magnitude of voltage is estimated battery, therefore can provide the electric vehicle that has suppressed cost.The difference of the full charge volume by benchmark and the electric weight of estimating according to the current value of actual magnitude of voltage and mapping graph retrieval, without using current sensor, just can obtain battery allowance, wherein, the full charge volume of benchmark based on electric discharge end voltage, be the voltage of residual capacity while being zero and determined to the electric current flowing in motor by this voltage.
According to the 2nd feature, based on full charge volume, calculate battery allowance, therefore improved estimated accuracy, this full charge volume is to determine according to the electric discharge end voltage corresponding to average consumed cur-rent.According to the 3rd feature, simplified mapping graph.
According to the 4th, the 5th feature, even if the characteristic after rigidly connecting energize unsettled during, also can carry out surplus demonstration.According to the 6th feature, improved the estimated accuracy of battery allowance.
According to the 7th feature, avoid demonstration change sharply, therefore can not give the uncomfortable sensation of user.According to the 8th feature, when motor stops, also can making user observe Yin Putong electrical load and the battery allowance that changes.
Accompanying drawing explanation
Fig. 1 is the left surface figure of electric vehicle that the battery allowance estimation unit of one embodiment of the present invention is installed.
Fig. 2 is the figure of physical circuit example that the major part control system of electric vehicle is shown.
Fig. 3 is the block diagram that the major part function of battery allowance estimator is shown.
Fig. 4 is the figure that the corresponding relation of dutycycle mapping graph and discharge current mapping graph is shown.
Fig. 5 is the figure that the constant-current discharge characteristic starting from the fully charged state of battery is shown.
Fig. 6 is the figure that the relation of residual capacity, voltage and current value based on constant-current discharge characteristic is shown.
Fig. 7 is the process flow diagram of battery allowance computing.
Fig. 8 is the figure that the indicating mode example of the pointer that is arranged at battery allowance display device is shown.
Label declaration
4: battery; 6: surplus estimator; 7: battery allowance display device; 8: inverter; 9: direct motor drive portion; 10: angular transducer; 11:DC-DC converter; 12: contactor; 13: speed probe; 15: main switch; 16: charger; 18: motor; 22: seat switch; 23: handle jaw opening sensor; 48: dutycycle mapping graph; 49: discharge current mapping graph; 51: residual capacity mapping graph.
Embodiment
Below, with reference to accompanying drawing, an embodiment of the invention are described.Fig. 1 is the left surface figure of electric vehicle that the battery allowance estimation unit of one embodiment of the present invention is installed.Electric vehicle 1 is the pedal-type cart with low pedal, on vehicle body frame 3, directly or via other parts each structure division is installed indirectly.Vehicle body frame 3 is comprised of following part: head tube (head pipe) 31; Front baffle part 32, its front end engages with head tube 31, and rear end is to downward-extension; A pair of main frame part 33, its past frame part 32 is divided right and left to width of the carbody direction respectively, and extends to car body rear; And afterframe part 36, it extends to car body back upper place from main frame part 33.
The front fork 2 of supporting front-wheel WF is supported on head tube 31 capable of free rotationly.Steering tiller 46 is connected in the top of the steering axle 41 of extending from front fork 2 to top and being supported by head tube 31.On steering tiller 46, be provided with handle jaw opening sensor 23, the angle of rotation that this handle jaw opening sensor 23 detects the not shown oil door handle that is arranged at car body right side is handle aperture.Headlamp 25 and the front rack 26 that is positioned at headlamp 25 tops are supported on the leading section of the bracket 37 of being combined with the front portion of head tube 31.
At the main frame part 33 of vehicle body frame 3 and the zone line of afterframe part 36, engage the bracket 34 that extend at oriented car body rear.Pivot 35 extends upward in width of the carbody side, is arranged on bracket 34.Possess as the rocking arm (swing arm) 17 of the motor 18 in vehicle traction source and be supported on pivot 35 in the mode of can easy on and off shaking.The output of motor 18 is passed to axletree of rear wheel 19, drives the trailing wheel WR that is supported on axletree of rear wheel 19.By rear linkage 20, connect shell and the afterframe part 36 that comprises axletree of rear wheel 19.When stopping, the side stand 24 of supporting body is pivotally supported on bracket 34.And, being provided with side bracket switch 28, this side bracket switch 28 is output detection signal when side stand 24 is accommodated precalculated position.
Battery 4 is installed in main frame part 33, and the top quilt cover 40 of battery 4 covers.In the front portion of battery 4, connect air leading-in conduit 38, at the rear portion of main battery 4, be provided with drawing fan 39.By drawing fan 39, from air leading-in conduit 38, to battery 4, import air, after battery 4 is cooling, this air is discharged to car body rear.Preferably by not shown air cleaner, to air leading-in conduit 38, import air.
In afterframe part 36, be provided with the socket 44 that can be connected with the plug 43 of charging cable 42, wherein, this charging cable 42 extends from the charger (not shown) that battery 4 is charged.In afterframe part 36, be also provided with tail-bracket 29 and taillight 27 etc.Between the afterframe part 36 of pair of right and left, be provided with container 50.On container 50, be provided with the driver's seat 21 of the lid that doubles as container 50, on driver's seat 21, be provided with the seat switch 22 of carrying out work and exporting the signal of taking a seat when driver sits down.
Fig. 2 is the figure of physical circuit example that the major part control system of electric vehicle is shown.In Fig. 2, control system possesses battery 4 and control device 5.In order to obtain desirable high voltage, battery 4 is configured to the battery module that a plurality of battery series connection are formed by connecting.Control device 5 possesses: the surplus estimator 6 of battery 4; The inverter 8 being formed by FETQ1～Q6; And the direct motor drive portion 9 that drives inverter 8.Control device 5 connects for showing the battery allowance display device 7 of the battery allowance being calculated by surplus estimator 6.That is, control device 5 possesses the microcomputer of the function with surplus estimator 6 and direct motor drive portion 9.
The three-phase output of inverter 8 is connected with the three-phase coil of motor 18.On motor 18, be provided with the angular transducer 10 of detection rotor position.The rotor-position that direct motor drive portion 9 is detected corresponding to angular transducer 10 is inputted pwm signal to FETQ1～Q6.The dutycycle of pwm signal is that the motor speed detecting corresponding to the handle aperture being detected by handle jaw opening sensor 23 and the output based on angular transducer 10 is determined, controls the voltage of supplying with to motor 18.
Control device 5 possesses DC-DC converter 11, the metering device that this DC-DC converter 11 offers the common electrical loads 55 such as headlamp 25 and taillight 27 these lamp devices, comprises battery allowance display device 7 for cell voltage being carried out to step-down.In motor 18, be provided with the speed probe 13 of the rotational speed N m that detects this motor 18.
The main track 47 of battery 4 is connected with the input side of inverter 8 and the input side of DC-DC converter 11 via the FET playing a role as contactor (hereinafter referred to as " contactor ").Input side at inverter 8 is provided with input capacitor C1, C2.Main track 47 is connected with one end of main switch 15 via the resistance R 1 and the voltage stabilizing diode ZD that are arranged in control device 5, and the other end of main switch 15 is connected with control device 5.Thus, main switch 15 can be brought into play the effect as the starting switch at the interior connection primary power of control device 5.
The control system of Fig. 2 is worked as follows.First, when charging, the plug 43 of the charger 16 arranging in addition outside car is connected with socket 44.So, the connecting portion that charged state detection line 14 and control device are 5 becomes the current potential that represents charged state, thus, in control device 5, can identify in charged state, even if so connect main switch 15, do not send steering order to direct motor drive portion 9 yet.
When charging finishes and pulls the plug out of the socket 43 time from socket 44, charged state detection line 14 becomes open-circuit condition, and therefore, when connecting main switch 15, control device 5 can confirm that charger 16 does not connect, and can send steering order to direct motor drive portion 9 thus.After the main switch 15 as starting switch is switched on, while meeting the following conditions, contactor 12 is connected, and applies voltage, that is: contactor 12 non-fault to inverter 8 and DC-DC converter 11; The voltage of the battery 4 connecting is in setting; Battery charger 16 does not connect; And by battery open a way judgement residual capacity non-vanishing.When detecting handle aperture, handle jaw opening sensor 23 starts opening value when above in predetermined driving, corresponding to this aperture with according to the motor speed of the output calculating of angular transducer 10, FETQ1～the Q6 of inverter 8 is carried out to PWM control, to improve dutycycle.Motor 18 is supplied to the output voltage by the inverter 8 of the dutycycle decision of FETQ1～Q6, is rotated.
Fig. 3 is the block diagram that the major part function of battery allowance estimator 6 is shown.In Fig. 3, dutycycle mapping Figure 48 retrieves the driving dutycycle of inverter 8, the i.e. mapping graph of the indicated value Vmap of the voltage from from inverter 8 to motor 18 inputs using handle aperture Th and motor speed Nm as parameter, this mapping graph is set to that handle aperture Th is larger and motor speed Nm is larger, and dutycycle is larger.This mapping graph is predefined based on measured value.
Discharge current mapping Figure 49 retrieves handle aperture Th and motor speed Nm to the mapping graph of the current value I map of motor 18 supplies as parameter.The current value I map setting in this discharge current mapping Figure 49 is the current value of supplying with to motor 18 from inverter 8 when the dutycycle (magnitude of voltage Vmap) according to setting in dutycycle mapping Figure 48 drives inverter 8, is to calculate in advance the value of obtaining.
To 9 inputs of direct motor drive portion, shine upon dutycycle (voltage indicated value) Vmap of Figure 48 retrieval by dutycycle, direct motor drive portion 9 recently drives the FETQ1～Q6 of inverter 8 according to the duty being instructed to.
Residual capacity mapping Figure 51 is arranged in described surplus estimator 6, is using magnitude of voltage and current value as parameter, to obtain the mapping graph of battery allowance (ampere * hour " Ah ").After describe residual capacity mapping Figure 51 in detail.In residual capacity mapping Figure 51 of surplus estimator 6, when being transfused to input voltage value (measured value) Vbatt inputting to inverter 8 and the current value I map obtaining based on discharge current mapping Figure 49, the residual capacity (Ah) based on these input values (Vbatt and Imap) output battery 4.The residual capacity of obtaining (Ah) is input to residue display device 7.
Fig. 4 is the figure that the corresponding relation of dutycycle mapping Figure 48 and discharge current mapping Figure 49 is shown.As shown in Figure 4, dutycycle mapping Figure 48 and discharge current mapping Figure 49 both flow through the electric current of motor 18 using handle aperture Th and motor speed Nm when parameter is retrieved dutycycle and drive inverter 8 according to this dutycycle.Therefore, dutycycle mapping Figure 48 and discharge current mapping Figure 49 are interrelated, the dutycycle of as shown in Figure 4, shining upon Figure 48 retrieval by dutycycle according to handle aperture Th, motor speed Nm is with to shine upon by discharge current the current value that Figure 49 retrieves according to identical handle aperture Th, motor speed Nm corresponding.
Fig. 5 is the figure that the constant-current discharge characteristic starting from the fully charged state of battery 4 (be not module but cell) is shown.In Fig. 5, preset the reference point of the fully charged state that represents battery 4.For example, in the situation that average discharge current is predetermined value (10A), reference point is for example, electric energy while becoming predetermined voltage (10.5V) of closed circuit voltage CCV.The residual capacity of battery 4 is according to the energy calculate of this reference point.
According to the reference point of setting, for example, when take current value 20A electric discharge and closed circuit voltage CCV now during as 11.0V, by transverse axis, read the capacity (Ah) of the position of reporting to the leadship after accomplishing a task of the 20A constant-current discharge characteristic line of Fig. 5 and the line of closed circuit voltage 11V.According to Fig. 5, can read the capacity of 16Ah.At this, because the reference point of showing out full charging is set as to 20Ah, so deduct 16Ah from 20Ah, the residual capacity of battery 4 is 4Ah.
Thus, the total volume of characteristic is made as reference point when discharging based on 10A, according to each discharge current and closed circuit voltage, calculates residual capacity, and generates and take residual capacity mapping Figure 51 that current value and magnitude of voltage be parameter according to this result of calculation.In addition, determine by experiment in advance the value of electric discharge end voltage, the mean value (average current value) of the sample data based on the middle collection of travelling in experiment repeatedly decides.For example, using in electric vehicle travels experiment, from travelling, start till the average overall travel speed stopping as 20km/ hour, on average supply with situation that electric current is 10A as benchmark, determine electric discharge end voltage.
Fig. 6 is the figure of relation that residual capacity (Ah), voltage V and the current value I of the constant-current discharge characteristic based on shown in Fig. 5 are shown.In addition, Fig. 6 illustrates the relation as voltage, electric current and the residual capacity of the battery module that a plurality of batteries are in series.Based on this, be related to input voltage and electric current, can generate residual capacity mapping Figure 51 of retrieval residual capacity (Ah).In addition, when reality generates residual capacity mapping Figure 51, if use the state that is similar to the value of 1 function rather than such 2 functions of Fig. 6, avoid numerical value complicated aspect be easily.That is, the line for the current value shown in Fig. 6, is modified to square root by current value, makes it be similar to straight line and generates mapping graph.
Fig. 7 is the process flow diagram of residual capacity computing.In Fig. 7, in step S1, during as starting, process, according to cell voltage (the being open-circuit voltage) OCV after main switch 15 is switched on, under the no-load condition of motor 18 before driven and the temperature of battery 4, carry out the retrieval of residual capacity mapping graph for open-circuit voltage, obtain the battery allowance grade that is set to n stage.
In step S2, according to the battery allowance grade of obtaining in step S1, drive battery allowance display device 7 and show surplus.By obtain the processing of residual capacity grade according to open-circuit voltage OCV, can suitably tackle this phenomenon, if that is: energising start after without the regular hour, the characteristic of battery 4 is just uncertain, thereby causes the phenomenon of initial surplus grade display delay.In addition, preferably, after main switch 15 is connected, predetermine the time of the stability of characteristics that is estimated as battery 4, through before this time, maintain the demonstration of step S2.
In step S3, judge whether battery allowance grade is zero.If battery allowance grade is zero, enters step S20 and stop direct motor drive.If battery allowance grade is non-vanishing, enters step S4 and judge that whether motor 18 is just driven.When motor 18 is just when driven, enter step S5 and retrieve discharge current mapping Figure 49, detect discharge current Imap.In step S6, calculate the mean value of discharge current Imap, carry out the equalization of the discharge current Imap that for example, tries to achieve within the schedule time (5 seconds).In step S7, detect to input voltage (sparking voltage) Vbatt of inverter 8 inputs.In step S9, Imap is identical with discharge current, the equalization of input voltage (sparking voltage) Vbatt to inverter 8 inputs detecting in the given time.
In step S9, judge whether cell voltage Vbatt is less than mapping graph lower limit.When being judged as cell voltage Vbatt being not less than mapping graph lower limit in step S9, enter step S10, to residual capacity mapping Figure 51, input the cell voltage Vbatt of actual measurement and the discharge current Imap of mapping graph retrieval, calculate battery allowance (Ah).
In step S11, calculate the mean value of the battery allowance (Ah) calculating in step S10.In step S12, calculate last computation battery allowance, be poor (amplitude of variation) of the battery allowance (current capability value) of current demonstration and the battery allowance of latest computed.In step S13, whether the amplitude of variation that judgement is calculated in step S12 is greater than predetermined maximum is allowed amplitude of variation.When the amplitude of variation of calculated value is less than predetermined maximum and allows amplitude of variation, enter step S14, reflect the battery allowance of this calculating and from residual capacity/demonstration voltage conversion table, retrieve the driving voltage of battery allowance display device 7.In step S15, utilize the driving voltage of retrieval to drive battery allowance display device 7 (for example driving pointer).In addition, about the driving of battery allowance display device 7, after Fig. 8 is further illustrated.
When the amplitude of variation of the calculated value of battery allowance is greater than predetermined amplitude peak, from step S13, enters step S16, and from current residual capacity (Ah), deduct the amount of maximum changing amplitude.When in step S16 after current residual capacity (Ah) deducts the amount of maximum changing amplitude, enter step S14, the residual capacity (Ah) of reflection after deducting also retrieved battery allowance grade from residual capacity/battery allowance map table.Like this, there is such effect: when amplitude of variation is larger, substitute the battery allowance calculate and to replacing residual capacity to show, thereby make displayed value slowly (for example every 5%) change, can not give the uncomfortable sensation of user.
In addition, in step S9, when being judged as cell voltage Vbatt and being less than mapping graph lower limit, because battery allowance is less, therefore correspondingly embodiment as processing such as export-restrictions.
In step S17, for example, use key (electric discharge end voltage table), lower voltage limit value corresponding to the discharge current Imap obtaining with the retrieval discharge current mapping Figure 49 end voltage of discharging is retrieved.In step S18, judge whether inverter output voltage Vbatt is discharging more than end voltage value.If step S18, for negating, enters step S16.On the other hand, if step S18 is for certainly, enter step S19, residual capacity (Ah) is made as to zero, enter step S20 and stop direct motor drive.
Before step S4 motor 18 when negating is driven, enter step S21, for example judge whether, through the schedule time (10 minutes).Through before the schedule time, return to step S3, through after the schedule time, enter step S22, in step S22 and S23, utilize in the same manner open-circuit voltage (OCV) to drive battery allowance display device 7 with step S1, S2.By this step S21, S22, even if the in the situation that of parking stopping motor 18, also can show periodically that the residual capacity of battery 4 is recognized user.Even if vehicle is in stopping, the surplus of battery 4 also can change because of the bright light of DC-DC converter 11 or lamp device, therefore shows that residual capacity is significant.
Then, the demonstration of battery allowance display device 7 is described.Fig. 8 is the figure that the indicating mode example of the pointer that is arranged at battery allowance display device 7 is shown.In Fig. 8, on the display surface of battery allowance display device 7, be marked with: scale 7a; The red area 7b that residual capacity is almost nil; And the full electric region 7c that represents fully charged state.On scale 7a, at red area 7b, between full electric region 7c, drive pointer 7d.
Near the bound of the residual capacity of battery 4, owing to being estimated value, so can be contemplated to the calculated value of residual capacity, can depart from real value.Therefore,, in the bound region of battery allowance, for example being less than in 2Ah or scope more than 16Ah in 20Ah battery, in order to avoid larger display error, about the demonstration in battery allowance display device 7, has considered following aspect.
Because the residual capacity of battery 4 surplus calculated value when larger can depart from actual value 2～3Ah left and right, and to consider the aging of battery, therefore, in high residual capacity region more than the 16Ah of 20Ah battery, 80% (16Ah) that is reduced to full when charging at residual capacity calculated value before, makes the pointer 7d of battery allowance display device 7 be shown in the position (with reference to Fig. 8 (a)) of the full electric region 7c of scale 7a.
On the other hand, when surplus approaches zero, allow and depart from actual value 1Ah left and right, so residual capacity 2Ah is made as to demonstration lower limit in 20Ah battery.Therefore, as shown in Fig. 8 (b), in 20Ah battery, in the residual capacity of calculating, be within the scope of 2Ah～4Ah time, drive pointer 7d to be located in red area 7b.In addition, in 20Ah battery, the residual capacity of calculating is 2Ah when following, drives pointer 7d to be located at the lower limit (one end of red area 7b) (with reference to Fig. 8 (c)) of displayable scope.
As mentioned above, according to present embodiment, without just estimating by calculating the residual capacity of battery 4 with galvanometer, and show in battery allowance display device 7.In addition, the invention is not restricted to above-mentioned embodiment, can in the scope described in claim, apply known technology and be out of shape.
Claims (8)
1. a battery allowance estimation unit for electric vehicle, is characterized in that,
This battery allowance estimation unit has:
Battery (4); Motor (18), it supplies with electric power by described battery (4), produces the driving force of electric vehicle; Handle jaw opening sensor (23), it detects being arranged at the operation aperture (Th) of the oil door handle on electric vehicle; Dutycycle mapping graph (48), it has preset the magnitude of voltage of supplying with to described motor (18) corresponding to described operation aperture (Th), as the driving dutycycle of motor drive circuit (8); And surplus estimation unit (6), it,, using the output voltage of described battery (4) and output current as parameter, calculates the estimation residual capacity of described battery (4),
Described surplus estimation unit (6) possesses:
Discharge current mapping graph (49), it corresponding to the dutycycle of setting in described dutycycle mapping graph (48), is set with the current value while switching on to described motor (18) according to the magnitude of voltage of being determined by described dutycycle in advance; And
Residual capacity mapping graph (51), it presets the residual capacity of battery (4) according to current value and magnitude of voltage,
Described surplus estimation unit (6) is configured to: according to the current value (Imap) calculating by described discharge current mapping graph (49) and the actual measurement magnitude of voltage (Vbatt) supplied with to described motor (18), use described residual capacity mapping graph (51) to calculate the residual capacity of described battery (4)
The discharge electricity amount having preset while making battery (4) when electric discharge, sparking voltage become predefined electric discharge end voltage with predefined current value is used as full charge volume,
Described residual capacity mapping graph (51) is set with estimation battery allowance, and this estimates the voltage of battery allowance based on the input from described battery (4) to described motor (18) and the current value now calculating by described discharge current mapping graph (49).
2. the battery allowance estimation unit of electric vehicle according to claim 1, is characterized in that,
Described full charge volume is that average consumed cur-rent and the electric discharge end voltage based on electric vehicle set.
3. the battery allowance estimation unit of electric vehicle according to claim 1, is characterized in that,
Described residual capacity mapping graph (51) is the current value of the parameter as this residual capacity mapping graph (51) to be carried out to straight line be similar to and generate.
4. the battery allowance estimation unit of electric vehicle according to claim 1, is characterized in that,
This battery allowance estimation unit possesses the battery allowance display device (7) that residual capacity based on described calculating shows battery allowance,
After rigidly connecting energize, open-circuit voltage is considered as to battery allowance, by described battery allowance display device (7), show battery allowance.
5. the battery allowance estimation unit of electric vehicle according to claim 4, is characterized in that,
Within the time predetermining, maintain the demonstration based on described open-circuit voltage.
6. the battery allowance estimation unit of electric vehicle according to claim 1, is characterized in that,
The magnitude of voltage and the current value that are input to described residual capacity mapping graph (51) are the mean value in the predetermined sample period.
7. the battery allowance estimation unit of electric vehicle according to claim 4, is characterized in that,
When the displayed value of described battery allowance display device (7) is above than the low predetermined maximum changing amplitude of the residual capacity of latest computed, make current displayed value slowly be reduced to up-to-date calculated value.
8. the battery allowance estimation unit of electric vehicle according to claim 4, is characterized in that,
When described motor (18) stops, every through the schedule time, measure open-circuit voltage, with this open-circuit voltage, replace battery allowance, by described battery allowance display device (7), carry out battery allowance demonstration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-106295 | 2011-05-11 | ||
| JP2011106295A JP5797004B2 (en) | 2011-05-11 | 2011-05-11 | Battery remaining amount estimation device for electric vehicle |
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| JP5898643B2 (en) * | 2013-05-24 | 2016-04-06 | 本田技研工業株式会社 | Power storage device remaining capacity display device and hybrid vehicle control device |
| CN103645377B (en) * | 2013-12-24 | 2016-02-24 | 山东大学 | Based on the battery nominal power Forecasting Methodology of Dynamic array control algorithm |
| JP6830318B2 (en) | 2016-01-15 | 2021-02-17 | 株式会社Ｇｓユアサ | Power storage element management device, power storage element module, vehicle and power storage element management method |
| JP6930572B2 (en) * | 2016-01-15 | 2021-09-01 | 株式会社Ｇｓユアサ | Power storage element management device, power storage element module, vehicle and power storage element management method |
| CN106291389B (en) * | 2016-10-12 | 2019-03-05 | 爱玛科技集团股份有限公司 | A kind of indicating means of battery remaining power, apparatus and system |
| CN110758127B (en) * | 2018-07-26 | 2022-03-15 | 比亚迪股份有限公司 | Method and device for charging battery, storage medium and electronic equipment |
| JP2021183975A (en) * | 2019-11-21 | 2021-12-02 | 株式会社Ｇｓユアサ | Electricity storage element management device, electricity storage element module, vehicle, and electricity storage element management method |
| CN111398834A (en) * | 2020-04-08 | 2020-07-10 | 西安交通大学 | A real-time estimation system and estimation method for liquid metal battery SoC |
| CN115078800B (en) * | 2021-03-15 | 2024-08-16 | 广汽埃安新能源汽车有限公司 | Current anti-shake method and device of current sensor, terminal equipment and storage medium |
| CN114123397B (en) * | 2021-11-12 | 2025-03-18 | 深圳绿威科技有限公司 | A power battery pack control method and a power battery pack |
| EP4227695A4 (en) | 2021-12-29 | 2024-01-24 | Contemporary Amperex Technology Co., Limited | METHOD AND SYSTEM FOR DETERMINING A REMAINING BATTERY CHARGING TIME |
| CN115825758B (en) * | 2021-12-29 | 2023-11-17 | 宁德时代新能源科技股份有限公司 | Method and system for determining remaining time of battery charge |
| CN114362350B (en) * | 2022-01-14 | 2023-07-28 | 杭州海康威视数字技术股份有限公司 | Power supply control method and power supply control device for camera |
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| JP2012239290A (en) | 2012-12-06 |
| CN102778650A (en) | 2012-11-14 |
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