CN101276949A - Device and method for detecting battery performance of hybrid power vehicle - Google Patents
Device and method for detecting battery performance of hybrid power vehicle Download PDFInfo
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Abstract
The invention discloses a detector for hybrid vehicle battery performance and a detection method thereof; the detector comprises an engine, a motor, a battery electrically connected with a battery management unit; characterized by that: the battery management system is also connected with a signal collection unit; with the structure and detection method, collecting battery voltage, current change, battery temperature, battery allowance during and after starting process of the engine by the signal collection unit, so as to accomplish online monitoring for essential resistance of the battery, obtaining the essential resistance with a calculation formula of battery performance, and taking the value as a parameter for battery performance correction; predicting battery performance (SOF) through quantized battery performance (SOF) data, analog battery performance (SOF) curve and a curve of battery performance (SOF) and cycle relation; according to the predicted battery performance (SOF), correcting operation area of battery, so as to improve efficiency and useful life of the hybrid vehicle battery.
Description
Technical field
The claimed technical scheme of the present invention relates to a kind of battery performance of hybrid power vehicle checkout gear and detection method of being used for.
Background technology
The performance of motor vehicle driven by mixed power power assembly is relevant with battery performance, battery performance detects the ability mainly be meant the charge-discharge performance that detects battery, battery life, battery efficiency, battery power output, whether can satisfy user demand in order to estimate battery, the factor of considering comprises the internal resistance of cell, self-discharge of battery, charging acceptable degree, discharging efficiency etc. usually.
Hybrid-power battery generally is composed in series by a plurality of cells, because factors such as the otherness that cell is made, the difference of environment for use, cell degradation, battery in use for some time, the otherness of each monomer performance of battery can increase, and cell integrated performance is the decision of monomer that do as one likes can be the poorest, therefore, needs to detect battery performance, avoid battery under the situation of poor-performing, still continue to use.
The motor vehicle driven by mixed power battery management system generally all has the battery charge state measuring ability, according to state-of-charge, realizes battery charging and discharging management and power calculation.But because the battery performance forecast function is not provided,, and continue to use battery, will reduce battery efficiency, shorten battery life if battery performance is relatively poor.In whole useful life of battery process, because the variation of unpredictable physics and chemistry, the performance of battery presents the progressively trend of decay, and battery performance reduces, thereby has reduced the reliability of motor vehicle driven by mixed power.The prediction of battery charge state can be determined the SOC (battery allowance) of battery by the charge/discharge electricity amount of battery.It is with respect to new battery than abstract concept that the battery performance prediction is one, a definite numerical value, and the battery performance prediction is the quality by this parameter evaluation battery performance of SOF (State Of Function functional status).The factor and the evaluation criterion that influence battery performance are a lot, and certain relevance is arranged between these factors, therefore, need definition correctly to estimate and detect the method for battery performance.The method of traditional detection battery performance is to discharge and recharge experiment by battery impulse, obtain the cycle-index and the life relation of battery, discharge and recharge number of times according to what battery had used then, infer the cycle-index of remaining battery, though this method can be predicted the performance of battery to a certain extent, but owing to be not with the key parameter of the battery main foundation as the prediction battery performance, do not consider the influence of battery operated environment to battery performance, there is very big error in therefore this method.
For improving fuel economy and extending battery life, hybrid-power battery is set different operation intervals, but generally, the hybrid-power battery management system generally has the state-of-charge forecast function, the method of a better prediction battery performance but is not provided, battery performance influences the reliability of motor vehicle driven by mixed power, battery performance is subjected to multiple factor affecting, for example battery charge state, battery temperature, cell degradation degree, when battery performance is relatively poor, as not taking to change measure such as battery operated interval, can greatly shorten battery life.Be that existing hybrid-power battery management system can not be according to battery performance, the operation interval of regulating cell.Existing battery management system is not considered the influence of cell health state to operation interval, regardless of battery performance, all selects identical operation interval for use, can not adjust the working region of battery, has reduced battery efficiency and life-span.The method of traditional detection battery performance can not satisfy above-mentioned requirements.
Summary of the invention
Technical problem to be solved by this invention is, a kind of battery performance of hybrid power vehicle checkout gear and detection method of being used for is provided, change online detection by voltage, the electric current of gathering engine start process and starting back battery to the internal resistance of cell, and considered the influence of temperature, charging and discharging currents to battery performance, by internal resistance of cell correction battery performance, prediction battery performance (SOF) has improved the accuracy of prediction battery performance.
For solving the problems of the technologies described above, technical scheme of the present invention is, a kind of battery performance of hybrid power vehicle checkout gear that is used for, comprise with engine, the coaxial motor that is connected, inverter, entire car controller, with the battery that the battery management controller is electrically connected, it is characterized in that: be provided with signal gathering unit in the described battery management controller; Described signal gathering unit, the voltage, the electric current variation that are used to gather engine start process and starting back battery, battery temperature, battery allowance is tried to achieve the internal resistance of cell by the computing formula of battery performance, and with the parameter of this value as the correction battery performance.
A kind of battery performance of hybrid power vehicle checkout gear that is used for, described signal gathering unit is the part of battery management controller, form by current sensor, temperature sensor, signal processing circuit etc., the battery management controller provides the power supply of current sensor and temperature sensor, and connects current sensor and temperature sensor output signal interface.
Another technical scheme of the present invention is that a kind of detection method that is used for the battery performance of hybrid power vehicle checkout gear, this method comprise routine step down;
A) initialization step; Set battery charge and discharge cycle number of times by checkout gear;
B) acquisition step; Gather the cell voltage V1 of engine start process, starting current I1, cell voltage V2 after the engine start, battery current I2 by signal gathering unit; Battery temperature during the battery charge and discharge cycle, the battery allowance during discharge (SOC);
D) calculation procedure 1; The signal of gathering according to acquisition step is by the internal resistance of internal resistance computing formula: Rbatt=(V2-V1)/(I1-I2) counting cell.
E) calculation procedure 2; According to the signal that acquisition step is gathered, the internal resistance of calculation procedure 1 counting cell with this variable of battery performance (SOF), is simplified to a quantifiable battery performance (SOF) data by computing formula; Battery is whenever finished charge and discharge cycles n time, upgrades primary cell performance (SOF) value, and does correction by internal resistance;
F) prediction steps; According to battery performance (SOF) data of calculation procedure 2 quantifications and the curve of simulated battery performance (SOF), the curve of battery performance (SOF) and recurrence relation, prediction battery performance (SOF);
G) revise step; According to the battery performance (SOF) of prediction steps prediction, by revising the operation interval of battery.
A kind of detection method that is used for the battery performance of hybrid power vehicle checkout gear, described computing formula is battery performance (SOF)=1-∑ α * Ψ+γ * r, the system that α is relevant with working temperature, Ψ is the coefficient relevant with operating current, r is the internal resistance of cell, and γ is the correction factor relevant with internal resistance.
A kind of battery performance of hybrid power vehicle checkout gear and detection method of being used for, owing to adopted above-mentioned structure and method of testing, voltage, the electric current of gathering engine start process and starting back battery by signal gathering unit change, battery temperature, battery allowance, realization is tried to achieve the internal resistance of cell to the on-line monitoring of the internal resistance of cell by the computing formula of battery performance, and with the parameter of this value as the correction battery performance.By battery performance (SOF) data and the curve of simulated battery performance (SOF) and the curve of battery performance (SOF) and recurrence relation that quantizes, prediction battery performance (SOF); According to the battery performance (SOF) of prediction, revise the operation interval of battery, improve the efficient and the life-span of hybrid power automobile battery.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments;
Fig. 1 is used for battery performance of hybrid power vehicle checkout gear structural representation for the present invention;
Fig. 2 is a signal gathering unit structural representation of the present invention;
Fig. 3 is the curve chart of simulated battery charge and discharge cycle;
Fig. 4 is the curve chart of battery performance (SOF) and recurrence relation;
Fig. 5 is battery operated interval schematic diagram;
Fig. 6 is the curve chart of battery performance and battery operated interval relation;
Fig. 7 measures internal resistance of cell curve chart for the current interruptions method;
Fig. 8 is under the uniform temperature, the graph of relation of the internal resistance of cell and battery charge state SOC;
Fig. 9 is a battery performance of hybrid power vehicle detection method flow chart;
In Fig. 1, Fig. 2,1, engine; 2, motor; 3, entire car controller; 4, battery management controller; 5, inverter; 6, battery; 7, current sensor; 8, temperature sensor.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to the effect of the specific embodiment of the present invention such as related control system and the mutual alignment between the checkout gear and annexation, each system and operation principle, method of testing etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
As shown in Figure 1 and Figure 2, a kind of battery performance of hybrid power vehicle checkout gear that is used for, comprise and the engine 1 coaxial motor that is connected 2, inverter 5, entire car controller 3, the battery 6 that is electrically connected with battery management controller 4, be provided with signal gathering unit in the described battery management controller 4.Described signal gathering unit is the part of battery management controller 4, form by current sensor 7, temperature sensor 8, signal processing circuit etc., battery management controller 4 provides the power supply of current sensor 7 and temperature sensor 8, and connect current sensor 7 and temperature sensor 8 output signal interfaces, and gather current signal, temperature signal, voltage signal by the analog-to-digital conversion passage.
Cell voltage, electric current that signal gathering unit is gathered after engine start process and the starting change, try to achieve the internal resistance of cell, and with the parameter of this value as the correction battery performance, the prediction of battery performance then is by defining a battery charging and discharging circulation, and method by experiment determines the relation of battery charging and discharging circulation and battery performance, and considers the influence to performance prediction of battery operated temperature, battery charging and discharging electric current.
Referring to Fig. 3 ~ Fig. 8, Fig. 3 is the curve chart of simulated battery charge and discharge cycle.As shown in the figure, in 0 ~ t1 simulated engine starting during this period of time, electric current is very big during this period of time, but the duration is short; T1 ~ t2 is the routine discharge operating mode of simulated battery during this period of time; The peak value of simulated battery charging during t2 ~ t3; The normal charge operating mode of simulated battery during t3 ~ t4; The rest of t4 ~ t5 simulated battery.
Fig. 4 is the graph of relation of battery performance (SOF) and cycle-index; As shown in the figure, new battery is in a period of time of bringing into use, though the battery performance cycle-index increases, when acquiring a certain degree, battery performance increases with access times and reduces, and when the battery cycle-index reaches N2 time, battery performance will descend fast with the battery access times.Generally, the internal resistance of cell is that a variation is measured very slowly, and is relevant with battery charge state, temperature and cell degradation degree.
Fig. 5 is the operation interval schematic diagram of battery, and battery operated interval is divided into overcharging buffering area, service area and crossing puts the district, according to different battery allowance SOC, controls discharging and recharging of battery, and this operation interval is not considered the influence of battery performance to battery operated interval.
Fig. 6 is the curve chart of the relation in battery performance and battery operated interval, as shown in the figure, and when battery performance SOF=1, the operation interval broad of battery, battery allowance SOC value is also higher, when battery performance SOF is low, battery operated interval is narrower, the corresponding reduction of battery allowance SOC value.
Fig. 7 is that current interruptions method provided by the invention is measured internal resistance of cell curve, and as shown in the figure, battery interrupts discharge a period of time in the constant-current discharge process, and writes down the voltage data of this process with the sampling rate of 1KHz at least.
Fig. 8 is under the uniform temperature, the graph of relation of the internal resistance of cell and SOC, and battery is in certain battery allowance SOC scope, and internal resistance can be regarded a constant as, and SOC is worth less than certain when battery allowance, and the internal resistance of cell will increase.
Referring to Fig. 9 battery performance of hybrid power vehicle detection method flow chart; A kind of detection method that is used for the battery performance of hybrid power vehicle checkout gear, this method comprise routine step down;
A) initialization step; Set battery charge and discharge cycle number of times by checkout gear;
B) acquisition step; Gather the cell voltage V1 of engine start process, starting current I1, cell voltage V2 after the engine start, battery current I2 by signal gathering unit; Battery temperature during the battery charge and discharge cycle, the battery allowance SOC during discharge; 10 voltage U 1～U10 and 10 electric current I 1～I10 that point changes that point changes in the continuous acquisition engine start process, 10 voltage U 10～U20 and 10 electric current I 10～I20 that point changes that point changes after the continuous acquisition engine start.
D) calculation procedure 1; Calculated signals according to the acquisition step collection goes out V1, I1, V2, I2, and the internal resistance by internal resistance computing formula: Rbatt=(V2-V1)/(I1-I2) counting cell; Method of measurement has been passed through a large amount of experiments with reference to the method for the direct current method survey internal resistance of cell of stipulating in the CEI-IEC60896-21 standard, has verified that the internal resistance of cell that the method is measured has higher precision.
E) calculation procedure 2; According to the signal that acquisition step is gathered, the internal resistance of calculation procedure 1 counting cell with this variable of battery performance SOF, is simplified to quantifiable battery performance SOF data by computing formula; Battery is whenever finished charge and discharge cycles n time, upgrades primary cell performance (SOF) value, and does correction by internal resistance.
F) prediction steps; According to the battery performance SOF data of calculation procedure 2 quantifications and the curve of simulated battery charge and discharge cycle, the curve of battery performance SOF and recurrence relation, prediction battery performance SOF.
G) revise step; According to the battery performance SOF of prediction steps prediction, revise the operation interval of battery.As shown in Figure 6, battery performance SOF value is different, and the operation interval of battery is just different, this according to battery performance, determine that neatly the method in battery operated interval can prolong the useful life of battery, guarantee that battery is in narrower operation interval work when battery during at poor-performing.
Described computing formula is battery performance SOF=1-∑ α * Ψ+γ * r, the system that α is relevant with working temperature, and Ψ is the coefficient relevant with operating current, and r is the internal resistance of cell, and γ is the correction factor relevant with internal resistance.Battery is whenever finished charge and discharge cycles n time, upgrades one time the SOF value, and does correction by internal resistance.For determining the relation between battery cycle-index and the battery performance, the present invention as shown in Figure 3, has defined a battery charging and discharging circulation according to the applying working condition of battery.
In sum, the present invention has defined the hybrid-power battery applying working condition, proposed to use the method for cycle-index prediction battery performance according to battery, for guaranteeing accuracy of predicting, considered the influence of battery temperature, charging and discharging currents to performance prediction, and, the invention provides a kind of internal resistance of cell computational methods that are applied to vehicle by the internal resistance of cell correction internal resistance of cell, can realize on-line monitoring to the internal resistance of cell.
Method provided by the invention is mainly used in the prediction battery performance, the principle of its prediction battery performance is by the battery charging and discharging cycle-index that adds up, the present invention is used for the battery charging and discharging state of cyclic operation of vehicle, determine the map curve of battery charging and discharging number of times and battery performance by the battery experiment, but experimental data is under the temperature of determining, finish under the electric current of setting, need therefore to consider that different battery temperatures, battery charging and discharging electric current influence it.
The present invention is quantized into confirmable SOF value with abstract battery performance, and the method for calculating SOF is to table look-up by revised battery cycle-index to obtain battery SOF, and provides correction by the internal resistance of cell.
Its principle of internal resistance computational methods provided by the invention is by gathering the change in voltage in the electric current change procedure, change the change in voltage of front and back and the ratio calculation internal resistance that electric current changes according to electric current, because, in the engine start process, battery current changes obviously, be easy to the evaluation difference in change, therefore, the present invention is by gathering voltage and the internal resistance of electric current difference in change counting cell in the engine start process.
The present invention is on the basis that the battery performance Forecasting Methodology is provided, proposed a kind of again according to battery performance, manage the method in battery operated interval, as shown in Figure 4, battery performance SOF value is different, and the operation interval of battery is just different, this according to battery performance, determine that neatly the method in battery operated interval can prolong the useful life of battery, guarantee that battery is in narrower operation interval work when battery during at poor-performing.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within the protection range of inventing.
Claims (3)
1, a kind of battery performance of hybrid power vehicle checkout gear that is used for, comprise and engine (1), the coaxial motor that is connected (2), inverter (5), entire car controller (3), the battery (6) that is electrically connected with battery management controller (4), it is characterized in that: be provided with signal gathering unit in the described battery management controller (4);
Described signal gathering unit, the voltage, the electric current that are used to gather engine start process and starting back battery (6) change battery temperature, battery allowance, computing formula by battery performance is tried to achieve the internal resistance of cell, and with the parameter of this value as the correction battery performance.
2, according to claim 1 or 2 described a kind of battery performance of hybrid power vehicle checkout gears that are used for, it is characterized in that: described signal gathering unit, form by current sensor (7), temperature sensor (8), signal processing circuit, battery management controller (4) provides the power supply of current sensor (7) and temperature sensor (8), and connects current sensor and temperature sensor output signal interface.
3, a kind of detection method that is used for the battery performance of hybrid power vehicle checkout gear, this method comprise routine step down;
A) initialization step; Set battery charge and discharge cycle number of times by checkout gear;
B) acquisition step; Gather the cell voltage V1 of engine start process, starting current I1, cell voltage V2 after the engine start, battery current I2 by signal gathering unit; Battery temperature during the battery charge and discharge cycle, the battery allowance during discharge (SOC);
D) calculation procedure 1; The signal of gathering according to acquisition step is by the internal resistance of internal resistance computing formula: Rbatt=(V2-V1)/(I1-I2) counting cell;
E) calculation procedure 2; According to the signal that acquisition step is gathered, the internal resistance of calculation procedure 1 counting cell with this variable of battery performance (SOF), is simplified to a quantifiable battery performance (SOF) data by computing formula; Battery is whenever finished charge and discharge cycles n time, upgrades primary cell performance (SOF) value, and does correction by internal resistance;
F) prediction steps; According to battery performance (SOF) data and the curve of simulated battery charge and discharge cycle and the curve of battery performance (SOF) and recurrence relation that calculation procedure 2 quantizes, prediction battery performance (SOF);
G) revise step; According to the battery performance (SOF) of prediction steps prediction, revise the operation interval of battery.
4, a kind of detection method that is used for the battery performance of hybrid power vehicle checkout gear according to claim 3, described computing formula is battery performance (SOF)=1-∑ α * Ψ+γ * r, the system that α is relevant with working temperature, Ψ is the coefficient relevant with operating current, r is the internal resistance of cell, and γ is the correction factor relevant with internal resistance.
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