CN103543404B - A kind of for idling start-stop system to the monitoring device of battery condition and method - Google Patents

A kind of for idling start-stop system to the monitoring device of battery condition and method Download PDF

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CN103543404B
CN103543404B CN201210237627.XA CN201210237627A CN103543404B CN 103543404 B CN103543404 B CN 103543404B CN 201210237627 A CN201210237627 A CN 201210237627A CN 103543404 B CN103543404 B CN 103543404B
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accumulator
voltage
stop
idling
battery
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CN201210237627.XA
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CN103543404A (en
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高锋
张强
何文
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重庆长安汽车股份有限公司
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Abstract

The present invention relates to a kind of monitoring device for idling start-stop system to battery condition, including processor, memorizer;One end of one voltage sensor is connected with described processor, and the other end of voltage sensor is connected with the positive pole of accumulator, and this voltage sensor is used for detecting battery tension;One end of one temperature sensor is connected with the AD mouth of described processor, and the temperature sensor other end is connected with the positive pole of accumulator;This temperature sensor is used for measuring battery temp, and temperature signal is converted into analog quantity, the AD mouth of processor be acquired;The digital input port of described processor receives the status signal starting motor.Further relate to a kind of monitoring method for idling start-stop system to battery condition.The present invention, when carrying out battery condition and judging, introduces accumulator rate of change, thus cancels current sensor, reduces the cost of battery condition monitoring device, simultaneously, it is ensured that battery condition monitoring accuracy disclosure satisfy that the demand of idling start-stop system.

Description

A kind of for idling start-stop system to the monitoring device of battery condition and method

Technical field

The present invention relates to electronic control device for automobile engine and method, be specifically related to a kind of for idling start-stop System is to the monitoring device of battery condition and method.

Background technology

Along with environment, energy problem increasingly serious, domestic and international Ge great automobile factory is all actively developing energy-saving and emission-reduction The research of new technique and application.Idling start-stop system reduces even by stopping electromotor during auto idle speed state Eliminate idling oil consumption and discharge.Due to its technology maturation, former car system is changed the least, cost increase few etc. excellent Gesture, in the coming years, external car load factory is all with idling start-stop system 100% standard configuration as target.And to realize idle Speed start stop system, needs to be monitored battery condition in real time, when accumulator electric-quantity is relatively low, opens in time Accumulator is charged by dynamic electromotor, it is to avoid owing to overdischarge causes electromotor to start.

Chinese patent 200310107882.3 discloses the monitoring of a kind of battery condition based on State Estimation Theory Method.The method is primarily adapted for use in power lithium-ion battery, and needs to measure internal storage battery electromotive force. In actual applications, internal storage battery electromotive force is difficult to measure.Chinese patent 200680006248.2 discloses A kind of method according to the change of engine starting process battery tension, battery condition being monitored and learning. But, the method needs to measure battery current, and special current sensor is relatively costly, and the method without Method estimates the real time electrical quantity in battery operation.

Summary of the invention

The invention aims to the deficiency overcoming existing battery condition monitoring device and method to exist, Thering is provided a kind of monitoring device for idling start-stop system to battery condition, it can reduce idling start-stop system System cost, ensures precision simultaneously, meets idling start-stop system requirements.

It is a further object to provide a kind of monitoring side for idling start-stop system to battery condition Method, this monitoring method can determine that accumulator electric-quantity is enough, to activate idling start-stop function, ensures simultaneously Can normally start after engine stop and car load electric equilibrium requirement;Can determine that accumulator electric-quantity is the most very few, To start electromotor to accumulator charging, it is to avoid excessively power shortage;Also can determine that accumulator ageing state, with right The relevant parameter of accumulator is modified.

A kind of monitoring device for idling start-stop system to battery condition of the present invention, including processing The memorizer that device is connected with processor, is characterized in that:

One end of one voltage sensor is connected with described processor, the other end of voltage sensor and accumulator Positive pole connects, and this voltage sensor is used for detecting battery tension;

One end of one temperature sensor is connected with the AD mouth of described processor, the temperature sensor other end and storage The positive pole of battery connects;This temperature sensor is used for measuring battery temp, and temperature signal is converted into simulation Amount, is acquired by the AD mouth of processor;

The digital input port of described processor receives the state signal starting motor shape, starts motor status signal and leads to The power supply signal crossing detection startup motor obtains.

Described a kind of monitoring device for idling start-stop system to battery condition, is characterized in that: described place Reason device is independent processor, or merges with other processor on automobile, as engine controller, idling rise Stop controller.

A kind of monitoring method for idling start-stop system to battery condition of the present invention, this monitoring method Using the above-mentioned monitoring device to battery condition, its step is as follows:

(1) accumulator ageing state judges;At engine startup, according to starting initial time Minimum voltage in battery tension and start-up course estimates accumulator ageing state;

(2) calculating accumulator voltage change ratio;When electromotor is in idle stop state, store Cell voltage rate of change calculates, and when other state, does not calculate battery tension rate of change;

Owing to battery tension changes over relatively slow, and when load current changes, it is easily generated fluctuation, So, adopt calculating accumulator voltage change ratio with the following method:

First with bigger sampling period, such as 1s, battery tension is carried out continuous several times sampling, such as 60 Secondary, then multiple battery tensions of continuous sampling are processed as the following formula:

Wherein, i and k is the sampling period, and N is sampling number;In actual application, for improving data profit By rate, sampling period i with k uses the different cycles, and general satisfaction requires as follows:

K=i × N

After being calculated average treatment voltage, battery tension rate of change can be calculated as follows:

Voltage (k-1) after voltage (k)-average treatment after battery tension rate of change (k)=average treatment;

(3) judgement that accumulator electric-quantity is the highest;According to battery tension, battery tension rate of change and perseverance The pressure charging interval judges that accumulator electric-quantity is the highest;When start-stop enables invalidating signal, to accumulator electric-quantity whether Abundant judge;Meet at the same time when requiring as follows, then judge that accumulator electric-quantity is abundant:

1. battery tension is more than rated voltage;2. battery tension rate of change is more than 0;3. before 1. the persistent period and the most simultaneously met in face is more than the limit value set;

1. it is to ensure that accumulator is entered constant-voltage charge state, i.e. accumulator electric-quantity by constant-current charge Increasing, charging current decreases so that generator operation is in rated voltage;

2. it is to ensure that accumulator is in charge and non-discharged state;

3. it is to ensure that accumulator has enough constant voltage charging times so that accumulator electric-quantity reaches relatively Many states;Charging interval limit value is the function of battery temp, and relation data between the two is with two dimension The form of tables of data is stored in memorizer 4, uses for battery condition monitoring algorithm;This tables of data Can be obtained by following test:

Under condition of different temperatures, first accumulator carrying out constant-current charge, voltage to be charged reaches generating After machine rated voltage, switch to constant-voltage charge, needed for recording the state-of-charge that accumulator reaches setting Constant voltage charging time, i.e. can get the relation of condition 3. middle charging interval limit value and battery temp;

(4) judgement that accumulator electric-quantity is the lowest;According to battery tension, battery tension rate of change Judge that accumulator electric-quantity is the lowest with ageing state;Enable signal in start-stop effective, and electromotor is in idle During speed stopped status, judging accumulator electric-quantity is the most very few, concrete decision method is as follows: if storing Cell voltage is less than limit value, then judge that accumulator electric-quantity is very few;Above-mentioned limit value computing formula is as follows:

Limit value=basis limit value × aging coefficient

Wherein, basis limit value is obtained by test by new accumulator, is the letter of battery temp and voltage change ratio Number, between relation store in memory with the form of three-dimensional data table, monitor for battery condition Method uses;Basis limit value can be obtained by following test with the relation of temperature, voltage change ratio:

Use new accumulator, under condition of different temperatures, with different discharge currents, accumulator is carried out perseverance Banish electricity, record voltage the most in the same time and state-of-charge;Then for the state-of-charge point set, carry Take out voltage change ratio and the voltage in corresponding moment therewith;Finally, binding tests temperature data is the most available Basis limit value three-dimensional data table, aging coefficient is the function of ageing state, after accumulator is aging, actual appearance Amount reduces, so under accumulator capacity fixing situation, the voltage of aging accumulator is higher than new accumulator;Always Change coefficient and be the voltage of aging accumulator and the ratio of new accumulator voltage, the most serious aging electric power storage Pond, this ratio is the biggest, thus obtains the two-dimensional data table of aging coefficient and ageing state, equally, this number It also is stored in memorizer according to table;

(5) idling start-stop enables the judgement of signal;Electricity according to accumulator judges, if it is determined that For accumulator electric-quantity low (very few), then start-stop enables invalidating signal, the most no matter other idle stop bar Whether part meets, and idling start-stop controller all should make electromotor be in operating condition;If it is determined that be accumulator Electricity is high (enough), then in the case of other idle stop condition meets, and idling start-stop controller meeting Stop electromotor;

Idling start-stop enables the decision logic of signal: if current idling start-stop enables signal effectively, and accumulator Electricity is low, then idling start-stop enables invalidating signal;If current idling start-stop enables invalidating signal, and storage battery Amount height, then idling start-stop enable signal is effective;Current idling start-stop is otherwise kept to enable signal condition constant.

The invention have the characteristics that under consideration idle stop state, accumulator operating mode is close to constant-current discharge, and electric power storage When pond is discharged to same state-of-charge with different discharge currents, voltage change ratio is different;This spy according to accumulator Property, the present invention is directed to idling start-stop control system, when carrying out battery condition and judging, introduce accumulator change Rate, not in use by the current signal needed for existing monitoring method, thus cancels current sensor, reduces accumulator The cost of state monitoring apparatus, simultaneously, it is ensured that battery condition monitoring accuracy disclosure satisfy that idling start-stop system The demand of system.

Accompanying drawing explanation

Fig. 1 is the constant-current discharge curve chart of accumulator difference discharge current;

Fig. 2 is the monitoring device schematic diagram of the battery condition of the present invention;

Fig. 3 is the monitoring method schematic block diagram of the battery condition of the present invention;

Fig. 4 is the three-dimensional data table starting initial voltage, start-up course minimum voltage and aging coefficient;

Fig. 5 is the flow chart of the accumulator ageing state determination methods of the present invention;

Fig. 6 is the flow chart of the battery tension rate of change computational methods of the present invention;

Fig. 7 is the flow chart of the accumulator electric-quantity determination methods of the present invention.

Detailed description of the invention

Below in conjunction with Figure of description, the present invention is described further.

Due to the effect of generator voltage controller, when load current is less than electromotor maximum output current, send out Motor is equivalent to source of stable pressure;When load current is more than electromotor maximum output current, electromotor is equivalent to constant current Source.So, when accumulator is charged on real vehicle, if electricity is less, be then equivalent to constant-current charge, now electric power storage Cell voltage increases in time;If electricity is more, be then equivalent to constant-voltage charge, now battery tension substantially constant. So when detecting that battery tension is less than rated voltage, accumulator is in constant-current charge or electric discharge shape State, now accumulator electric-quantity may be less.And after battery tension is more than rated voltage, illustrate to store Battery electric quantity is the most, and charging current decreases, and is in constant-voltage charge state.Maintenance constant-voltage charge is certain After time, accumulator i.e. basically reaches full state.According to battery tension size and constant-voltage charge persistent period I.e. can determine that accumulator electric-quantity is the most abundant.The time that constant-voltage charge process needs maintain can be according to accumulator Constant-voltage charge test determines.

In engine idle stopped status, owing to the load opened is relatively fixed, so accumulator is substantially at perseverance Banish electricity condition, as shown in Figure 1.Accumulator is discharged to same SOC (charged shape with different discharge currents State) value time, its terminal voltage and voltage rate over time all differs.Discharge current is the biggest, storage battery Pressing the lowest, change in voltage is the fastest.So, can be according to the voltage of accumulator and voltage rate over time Judge that accumulator electric-quantity is the most very few.

Considering that accumulator ageing process is slow, aging rear internal resistance increases, in the case of same charge and discharge current, Accumulator voltage can significantly reduce.Current Sensorless in the monitoring device of the consideration present invention and method, and just Often in driving conditions, it is difficult to determine the degree of aging of accumulator according only to voltage.In engine starting process, The electric current of starter motor consumption is relatively fixed, so degree of falling according to battery tension can enter in start-up course Row ageing state judges.

Fig. 2 is a kind of schematic diagram for idling start-stop system to the monitoring device of battery condition, and this monitoring fills Putting the memorizer 4 including that processor 3 is connected with processor, its innovative point is: the one of a voltage sensor 2 End is connected with described processor 3, and the other end of voltage sensor is connected with the positive pole of accumulator 1, and this voltage passes Sensor is used for detecting battery tension;

One end of one temperature sensor 5 is connected with the AD mouth of described processor 3, the temperature sensor other end with The positive pole of accumulator 1 connects;This temperature sensor is used for measuring battery temp, and temperature signal is converted into mould Analog quantity, is acquired by the AD mouth of processor;The digital input port of described processor 3 receives and starts motor shape State signal, starts motor status signal and is obtained by detecting the power supply signal starting motor.

Voltage sensor 2 is used for gathering battery tension, and is transferred to processor 3 by analog quantity;Accurate for energy Really detect that the change in voltage of accumulator, the precision of voltage sensor 2 are 1mV;

Memorizer 4 is used for storing various data, including starting initial voltage, starting minimum voltage and ageing state Three-dimensional data table, voltage change ratio, temperature and voltage limits tables of data, ageing state and aging coefficient tables of data Deng;

Temperature sensor 5 is used for detecting battery temp, and is transferred to processor 3 in analog quantity mode.

When processor 3 numeral input port signal is low level, illustrate that starting motor does not works;During for high level, Illustrate that starting motor is in operating condition.

Described processor 3 is independent processor, or merges with other processor on automobile, such as electromotor control Device processed, idling start-stop controller, this example is idling start-stop controller.

Fig. 3 is the monitoring method schematic block diagram of the battery condition of the present invention, including ageing management module 6, stores Battery electric quantity judge module 7 and rate of change computing module 8;Battery condition monitoring method operates in processor 3 In;

Ageing management module 6 judges accumulator ageing state according to start-up course Voltage Drop;

Accumulator electric-quantity judge module 7 is main according to battery tension and voltage change ratio electricity current to accumulator Amount the most enough judges, and will determine that result exports to idling start-stop controller;

In the case of accumulator electric-quantity is enough, if other idle stop condition meets, then idling start-stop controller stops Only electromotor;If accumulator electric-quantity is very few, even if then other idle stop condition meets, idling start-stop controller Also electromotor can be made to keep operating;

Rate of change computing module 8 calculating accumulator voltage change ratio, output is to accumulator electric-quantity judge module 7 Carry out accumulator electric-quantity judgement;

The motor status signal that starts needed for ageing management module 6 is gathered startup by the digital input port of processor 3 The power supply signal of motor obtains;Low level represents that startup motor does not works, and high level represents startup motor work.

A kind of monitoring method for idling start-stop system to battery condition of the present invention, this monitoring method Using the monitoring device of above-mentioned battery condition, its step is as follows:

(1) accumulator ageing state judges;At engine startup, according to starting initial time Minimum voltage in battery tension and start-up course estimates accumulator ageing state;

Accumulator ageing state has reacted the degree of aging of accumulator, is to start initial time battery tension With the function of minimum voltage in start-up course.Relation between above-mentioned factor is tried by following automobile starting Test and obtain: using different ageing state, the accumulator of different state-of-charges to start electromotor, record starts During battery tension delta data, and extract and start the battery tension of initial time and startup The minimum voltage of process, the accumulator ageing state corresponding with test data constitutes three-dimensional data table and (sees Fig. 4), this tables of data is stored in memorizer 4, and battery condition monitoring policy can be according to actual startup Initial voltage and the minimum voltage of start-up course, obtained the old of accumulator by this three-dimensional data table by tabling look-up Change state;

(2) calculating accumulator voltage change ratio;When electromotor is in idle stop state, store Cell voltage rate of change calculates, and when other state, does not calculate battery tension rate of change;

Owing to battery tension changes over relatively slow, and when load current changes, it is easily generated fluctuation, So, adopt calculating accumulator voltage change ratio with the following method:

First with the bigger sampling period, as used the sampling period of 1 second that battery tension is carried out continuously Multiple battery tensions of continuous sampling, such as 60 times, are then processed by multiple repairing weld as the following formula:

Wherein, i and k is the sampling period, and N is sampling number;In actual application, for improving data profit By rate, sampling period i with k uses the different cycles, and general satisfaction requires as follows:

K=i × N

After being calculated average treatment voltage, battery tension rate of change can be calculated as follows:

Voltage (k-1) after voltage (k)-average treatment after battery tension rate of change (k)=average treatment;

(3) judgement that accumulator electric-quantity is the highest;According to battery tension, battery tension rate of change and perseverance The pressure charging interval judges that accumulator electric-quantity is the highest;When start-stop enables invalidating signal, to accumulator electric-quantity whether Abundant judge;Meet at the same time when requiring as follows, then judge that accumulator electric-quantity is abundant:

1. battery tension is more than rated voltage;2. battery tension rate of change is more than 0;3. before 1. the persistent period and the most simultaneously met in face is more than the limit value set;

1. it is to ensure that accumulator is entered constant-voltage charge state, i.e. accumulator electric-quantity by constant-current charge Increasing, charging current decreases so that generator operation is in rated voltage;

2. it is to ensure that accumulator is in charge and non-discharged state;

3. it is to ensure that accumulator has enough constant voltage charging times so that accumulator electric-quantity reaches relatively Many states;Charging interval limit value is the function of battery temp, and relation data between the two is with two dimension The form of tables of data is stored in memorizer 4, uses for battery condition monitoring algorithm;This tables of data Can be obtained by following test:

Under condition of different temperatures, first accumulator carrying out constant-current charge, voltage to be charged reaches generating After machine rated voltage, switch to constant-voltage charge, needed for recording the state-of-charge that accumulator reaches setting Constant voltage charging time, i.e. can get the relation of condition 3. middle charging interval limit value and battery temp;

(4) judgement that accumulator electric-quantity is the lowest;According to battery tension, battery tension rate of change Judge that accumulator electric-quantity is the lowest with ageing state;Enable signal in start-stop effective, and electromotor is in idle During speed stopped status, judging accumulator electric-quantity is the most very few, concrete decision method is as follows: if storing Cell voltage is less than limit value, then judge that accumulator electric-quantity is very few;Above-mentioned limit value computing formula is as follows:

Limit value=basis limit value × aging coefficient

Wherein, basis limit value is obtained by test by new accumulator, is the letter of battery temp and voltage change ratio Number, between relation be stored in memorizer 4 with the form of three-dimensional data table, for battery condition supervise Survey method uses;Basis limit value can be obtained by following test with the relation of temperature, voltage change ratio:

Use new accumulator, under condition of different temperatures, with different discharge currents, accumulator is carried out perseverance Banish electricity, record voltage the most in the same time and state-of-charge;Then for the state-of-charge point set, carry Take out voltage change ratio and the voltage in corresponding moment therewith;Finally, binding tests temperature data is the most available Basis limit value three-dimensional data table, aging coefficient is the function of ageing state, after accumulator is aging, actual appearance Amount reduces, so under accumulator capacity fixing situation, the voltage of aging accumulator is higher than new accumulator;Always Change coefficient and be the voltage of aging accumulator and the ratio of new accumulator voltage, the most serious aging electric power storage Pond, this ratio is the biggest, thus obtains the two-dimensional data table of aging coefficient and ageing state, equally, this number It also is stored in memorizer 4 according to table;

(5) idling start-stop enables the judgement of signal;Electricity according to accumulator judges, if it is determined that For accumulator electric-quantity low (very few), then start-stop enables invalidating signal, the most no matter other idle stop bar Whether part meets, and idling start-stop controller all should make electromotor be in operating condition;If it is determined that be accumulator Electricity is high (enough), then in the case of other idle stop condition meets, and idling start-stop controller meeting Stop electromotor;

Idling start-stop enables the decision logic of signal: if current idling start-stop enables signal effectively, and accumulator Electricity is low, then idling start-stop enables invalidating signal;If current idling start-stop enables invalidating signal, and storage battery Amount height, then idling start-stop enable signal is effective;Current idling start-stop is otherwise kept to enable signal condition constant.

Fig. 5 is the flow chart of accumulator ageing state determination methods.Due to engine starting process Voltage Drop speed Degree quickly, for Voltage Drop process accurately being detected, run by the accumulator ageing state determination methods shown in Fig. 5 Speed, the calculating cycle is 0.1ms.

Accumulator ageing state determination methods, from the beginning of the first initialization module 61, initializes in memorizer 4 Initialize a memory space, for storing initial voltage and the minimum voltage of start-up course;

After initialization completes, enter the first high level module 62, judge whether starting electromotor, sentence Disconnected method is as follows: if starting motor status signal is the first high level, illustrate to start motor in running order, Then enter the first collection voltage module 63, gather start-up course initial voltage;If starting motor status signal it is Low level, illustrates that starting motor does not works, then return the first high level module 62, enter next cycle;The One gathers voltage module 63 gathers battery tension, and is stored in memorizer 3, and this voltage is and opens Dynamic initial voltage, uses the minimum voltage in this voltage initialization memorizer 3 simultaneously;

After collection battery tension completes, enter the second high level module 65, sentence starting motor status Disconnected: if starting motor status signal is high level, to start motor work, startup minimum voltage need to be detected, then enter Enter the second collection voltage module 66;If starting motor status signal is low level, starts motor and stop, explanation Start-up course terminates, then enter aging judge module 64;

After second collection voltage module 66 completes battery tension collection, enter the low module of voltage 67, will gather Battery tension and memorizer 3 in the minimum voltage of record compare: if the battery tension gathered is less than Minimum voltage in memorizer 3, then enter and update minimum voltage module 68;Otherwise, the second high level is returned Module 65, continues to judge starter motor state.Update minimum voltage module 68 and use the accumulator gathered After minimum voltage in voltage more new memory 3, return the second high level module 65.Aging judge module 64 Read the startup initial voltage of record, start-up course minimum voltage, initial voltage, start-up course in memorizer 3 Minimum voltage and ageing state three-dimensional data table, use the method linearly looking into value to obtain the aging shape of current accumulator State, and export to accumulator electric-quantity judge module 7.Accumulator ageing state is that 0 expression accumulator is the most aging, Be 1 expression accumulator be new accumulator.

Fig. 6 is the flow chart of the battery tension rate of change computational methods of the present invention.Rate of change computing module 8 Carrying out battery tension rate of change calculating, required engine status signal is exported by idling start-stop controller, uses Idle stop state whether it is in difference electromotor.

Battery tension rate of change computational methods, from the beginning of the second initialization module 81, initialize content and include: A space is initialized, for memory counter, voltage accumulated value, voltage change ratio, average in memorizer 4 Magnitude of voltage;The intervalometer of initialization processor 3.Enter Active Timer module 82 after when completing, reset Intervalometer in processor 3, and activate.Timer time is judged by judge module 83: work as intervalometer When time reaches 1 second, then enter voltage accumulation module 84;Otherwise return module 83, when continuing intervalometer Between judge.Voltage accumulation module 84 gathers battery tension, and accumulates it storage in memorizer 4 Voltage accumulated value, simultaneously by memorizer 4 enumerator increase by 1.Judge module 85 is entered after completing, right Memorizer 4 Counter value judges: if Counter Value is 30, then enter rate of change computing module 86 and count Calculate voltage change ratio;Otherwise, return Active Timer module 82 and reactivate intervalometer.Rate of change calculates mould Block 86 rate of change calculates and need to complete to operate as follows:

(1) according to following formula calculating average voltage level:

(2) according to following formula calculating voltage change ratio:

Calculate the average voltage level-calculating average voltage level of voltage change ratio=memorizer 4 storage;

(3) average voltage level calculated in average voltage level more new memory 4 is used.

Owing to battery tension changes over relatively slow, especially in the case of discharge current is less, above-mentioned intervalometer The selection Ying Yineng of limit value sum counter limit value detects that battery tension is changed to benchmark.In the inconspicuous feelings of voltage Under condition, voltage sample period and the cycle of rate of change calculating can be increased.

Complete to enter idle stop module 87 after rate of change calculates engine condition is judged: if electromotor It is in idle stop, then enters rate of change no more than 0 module 88 and further calculating voltage change ratio is sentenced Disconnected;Otherwise, enter renewal rate of change module 89 and be changed rate renewal.During due to idle stop, accumulator Certainly being in discharge condition, voltage change ratio should be less than 0.If voltage change ratio is more than 0, should be to be become by load Change the interference caused.So rate of change is judged by rate of change no more than 0 module 88: if rate of change is not More than 0, then enter new change rate module 89 and update voltage change ratio;Otherwise, voltage change ratio is not carried out Update, be directly entered counter resets module 90.Counter resets module 90 uses the voltage change ratio calculated Voltage change ratio in more new memory 4 also exports and carries out accumulator electric-quantity to accumulator electric-quantity judge module 7 and sentence Disconnected.After counter resets module 90 is to the Counter Value of storage resets in memorizer 4, returns to activate and determine Time device module 82 start new voltage change ratio and calculate process.

Fig. 7 is the flow chart that the accumulator electric-quantity judge module 7 of the present invention judges accumulator electric-quantity, this flow process The calculating cycle be 10ms.Accumulator electric-quantity judge module 7 exports idling start-stop and enables signal, and 0 represents idling Start-stop is invalid, even if now other idle stop condition meets, does not the most allow idling start-stop controller to stop starting Machine;1 represents that idling start-stop is effective, and when i.e. other idle condition condition meets, idling start-stop controller can stop Electromotor.

Accumulator electric-quantity determination methods is from the beginning of the 3rd initialization module 71, and initialization procedure includes: initialize The intervalometer of processor 3;Initialize memorizer 4 space to be used for storing idling start-stop enable signal.Complete initial Enter voltage > 12.3V module 72 after change, initial idling start-stop is enabled signal and judges, it is judged that method As follows:

If battery tension > 12.3V, then enter the first effective module of idling start-stop 74 and make idling start-stop effective; Otherwise entering the invalid module of idling start-stop 73 makes idling start-stop invalid.Power on the initial stage just, can be approximately considered Battery tension is open-circuit voltage, therefore, it can according to setting state-of-charge correspondence battery open-circuit voltage conduct The initial idling of voltage > 12.3V module 72 enables the battery tension limit value that signal judges.First idling start-stop Effectively the idling start-stop in module 74 more new memory 4 enables signal is 1, and exports to idling start-stop control Device.It is 0 that idling start-stop enables signal with or without the idling start-stop in module 73 more new memory 4, and output is given Idling start-stop controller.Complete to initialize judge after enter the second effective module of idling start-stop 75 to current idle Speed start-stop enabled state judges, it is judged that method is as follows: idling start-stop is effective, then enter idle stop module Engine condition is judged by 76 further;Otherwise, enter electricity high module 78 and judge that accumulator electric-quantity is No abundant, enable signal with the idling start-stop in more new memory 4.Due to when electromotor operates, it is not necessary to The state carrying out accumulator electric-quantity not enough judges, only at idle stop, under battery discharging state, for Ensure startup ability next time and electric equilibrium, just need to accumulator electric-quantity whether deficiency judges.So idling The determination methods shutting down module 76 is as follows: if being in idle stop state, then enter electricity low module 77 to storage Battery electric quantity is the lowest to be judged;Otherwise, return the second effective module of idling start-stop 75 to start the next one and follow Ring.The determination methods of the low module of electricity 77 is: if battery tension is less than limit value, then accumulator electric-quantity is described Too low, then enter the invalid module of idling start-stop 73 and make idling start-stop invalid;Otherwise return the second idling start-stop effective Return module 75 and start next circulation.The low module of electricity 77 judges that the most too low voltage limits of electricity is by following formula It is calculated:

Limit value=basis limit value × aging coefficient.

Wherein, basis limit value is by battery temp and voltage change ratio, by the accumulator of storage in memorizer 4 Temperature, voltage change ratio and voltage limits three-dimensional data table are obtained by linear interpolation.Aging coefficient is according to module The ageing state of 6 outputs, obtains according to the ageing state in memorizer 4 and aging coefficient 2-D data linear interpolation Arrive.The method that electricity high module 78 carries out accumulator electric-quantity height judgement is as follows: if meet following requirement simultaneously: (1) battery tension > 14.3V, (two) battery tension rate of change is not less than 0, (three) condition () (2) time simultaneously met was more than 20 minutes, then judge that accumulator electric-quantity is high, enter the first idling and rise Stopping effective module 74 makes idling start-stop effective;Otherwise, return the second effective module of idling start-stop 75 and start next Individual circulation.Battery tension limit value in above-mentioned condition () is rated voltage.Condition (three) is wanted The time limit value asked, determined according to the time needed for accumulator constant-voltage charge to setting state-of-charge.

Claims (1)

1. for an idling start-stop system monitoring method to battery condition, the accumulator that this monitoring method uses The monitoring device of state, the memorizer being connected with processor including processor;One end of one voltage sensor with Described processor connects, and the other end of voltage sensor is connected with the positive pole of accumulator, and this voltage sensor is used for Detection battery tension;One end of one temperature sensor is connected with the AD mouth of described processor, temperature sensor The other end is connected with the positive pole of accumulator;This temperature sensor is used for measuring battery temp, is turned by temperature signal Turn to analog quantity, the AD mouth of processor be acquired;The digital input port of described processor receives and starts electricity The status signal of machine, is started motor status signal and is obtained by the power supply signal of detection startup motor;Described process Device is independent processor, or merges with the engine controller on automobile, idling start-stop controller;
Monitoring step is as follows:
(1) accumulator ageing state judges;At engine startup, according to the storage battery starting initial time Minimum voltage in pressure and start-up course estimates accumulator ageing state;
(2) calculating accumulator voltage change ratio;When electromotor is in idle stop state, carry out battery tension Rate of change calculates, and when other state, does not calculate battery tension rate of change;
Owing to battery tension changes over relatively slow, and when load current changes, it is easily generated fluctuation, so, Adopt calculating accumulator voltage change ratio with the following method:
First battery tension is carried out continuous 60 samplings, then multiple battery tensions of continuous sampling is pressed Formula processes:
Wherein, i and k is the sampling period, and N is sampling number;In actual application, for improving data user rate, adopt Sample cycle i with k uses the different cycles, and general satisfaction requires as follows:
K=i × N
It is calculated voltage after average treatment, can be calculated as follows battery tension rate of change:
Voltage (k-1) after voltage (k)-average treatment after battery tension rate of change (k)=average treatment;
(3) judgement that accumulator electric-quantity is the highest;Fill according to battery tension, battery tension rate of change and constant voltage The electricity time judges that accumulator electric-quantity is the highest;When start-stop enables invalidating signal, enough to accumulator electric-quantity Judge more;Meet at the same time when requiring as follows, then judge that accumulator electric-quantity is abundant:
1. battery tension is more than rated voltage;2. battery tension rate of change is more than 0;3. before 1. and The persistent period the most simultaneously met is more than the limit value set;
1. it is to ensure that accumulator is entered constant-voltage charge state, i.e. accumulator electric-quantity by constant-current charge and increases, fills Electricity electric current decreases so that generator operation is in rated voltage;
2. it is to ensure that accumulator is in charge and non-discharged state;
3. it is to ensure that accumulator has enough constant voltage charging times so that accumulator electric-quantity reaches more shape State;Charging interval limit value is the function of battery temp, and relation data between the two is with the shape of two-dimensional data table Formula stores in memory, uses for battery condition monitoring method;This tables of data can be by testing as follows Arrive:
Under condition of different temperatures, first accumulator carrying out constant-current charge, voltage to be charged reaches the specified electricity of electromotor After pressure, switch to constant-voltage charge, record accumulator and reach the constant voltage charging time needed for the state-of-charge set, I.e. can get the relation of condition 3. middle charging interval limit value and battery temp;
(4) judgement that accumulator electric-quantity is the lowest;According to battery tension, battery tension rate of change and aging shape State judges that accumulator electric-quantity is the lowest;Signal is enabled effective in start-stop, and when electromotor is in idle stop state, Judging accumulator electric-quantity is the most very few, concrete decision method is as follows: if battery tension is less than limit value, Then judge that accumulator electric-quantity is very few;Above-mentioned limit value computing formula is as follows:
Limit value=basis limit value × aging coefficient
Wherein, basis limit value is obtained by test by new accumulator, is the function of battery temp and voltage change ratio, Between relation store in memory with the form of three-dimensional data table, make for battery condition monitoring method With;Basis limit value can be obtained by following test with the relation of temperature, voltage change ratio:
Use new accumulator, under condition of different temperatures, with different discharge currents, accumulator carried out constant-current discharge, Record voltage the most in the same time and state-of-charge;Then for the state-of-charge point set, extract corresponding therewith The voltage change ratio in moment and voltage;Finally, binding tests temperature data i.e. available basis limit value three-dimensional data Table, aging coefficient is the function of ageing state, and after accumulator is aging, actual capacity reduces, so accumulator is held Under amount fixing situation, the voltage of aging accumulator is higher than new accumulator;Aging coefficient is the electricity of aging accumulator Pressure and the ratio of new accumulator voltage, the most serious aging accumulator, this ratio is the biggest, thus obtains aging system Number and the two-dimensional data table of ageing state, equally, this tables of data also is stored in memorizer;
(5) idling start-stop enables the judgement of signal;Electricity according to accumulator judges, if it is determined that be accumulator Electricity is low, then start-stop enables invalidating signal, and the most whether other idle stop condition meets, idling start-stop Controller all should make electromotor be in operating condition;If it is determined that be that accumulator electric-quantity is high, then at other idle stop In the case of condition meets, idling start-stop controller can stop electromotor;
Idling start-stop enables the decision logic of signal: if current idling start-stop enables signal effectively, and accumulator electric-quantity Low, then idling start-stop enables invalidating signal;If current idling start-stop enables invalidating signal, and accumulator electric-quantity is high, Then idling start-stop enable signal is effective;Current idling start-stop is otherwise kept to enable signal condition constant.
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