CN112277646B - Power battery high-voltage connector fault detection method and device and automobile - Google Patents
Power battery high-voltage connector fault detection method and device and automobile Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting faults of a high-voltage connector of a power battery and an automobile, wherein the method comprises the following steps: acquiring a first voltage signal through a first port of a high-voltage connector state detection circuit, and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit; acquiring a vehicle speed value of a vehicle where the power battery is located; filtering the first voltage signal to obtain a first filtered signal, and filtering the second voltage signal to obtain a second filtered signal; when the vehicle speed value is judged to be higher than a first preset vehicle speed value, calculating a first state parameter K according to the first filtering signal and the second filtering signalz(ii) a According to the first state parameter KzAnd carrying out fault detection on the high-voltage connector of the power battery. The invention can detect the fault of poor contact caused by aging and vibration loosening of the high-voltage connector, and avoid the problem of huge safety risk caused by poor contact of the high-voltage connector.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for detecting faults of a high-voltage connector of a power battery and an automobile.
Background
With the rapid popularization and development of pure electric vehicles, people have higher and higher requirements on vehicle power performance, such as better acceleration performance, higher maximum speed and the like, but different from traditional fuel vehicles, all energy in the running process of the pure electric vehicles comes from a high-voltage power battery, and therefore many parts are powered by the high-voltage battery.
At present, the output voltage of a high-voltage power battery of a pure electric vehicle shows a trend of gradually increasing, and the output voltage of a power battery of a mainstream pure electric vehicle reaches nearly 500V. Different from alternating current, high-voltage direct current is dangerous, high-voltage direct current has greater harm to human bodies when the same electric shock accident occurs, and pure electric vehicles in China are definitely required to detect disconnection faults of high-voltage connectors aiming at the characteristic that pure electric vehicles are different from fuel vehicles. Considering that the disconnection of the high-voltage connector brings huge risks to the safety of vehicles and the safety of personnel on the vehicles, the high-voltage interlocking fault processing is highly consistent at home and abroad, and the fault risk is reduced by the high voltage reduction of the vehicles. The existing high-voltage interlocking fault mechanism at home and abroad can detect the connection state of a high-voltage interlocking connector in a vehicle, however, for the high-voltage connector of a pure electric vehicle, particularly the high-voltage connector connected with a power battery, the detection of the connection state (connection and disconnection) of the connector is not enough, the current flowing in the high-voltage connector of the power battery can reach hundreds of amperes during the running process of the pure electric vehicle, particularly under the high-speed working condition, which puts a very high requirement on the connection tightness of the high-voltage connector, if the high-voltage contact in the connector generates unexpected poor contact due to oxidation corrosion, aging and loosening during the running process of the vehicle, the unexpected poor contact can cause the arc discharge phenomenon at the high-voltage contact under the condition that large current passes through, and simultaneously releases a large amount of heat, this condition can result in the high voltage connectors being burned, thereby exposing the vehicle and occupants to a significant risk.
At present, for huge potential safety hazards caused by poor contact of a high-voltage connector, the traditional high-voltage interlocking fault detection mechanism cannot detect the poor contact fault caused by aging and vibration loosening of the high-voltage connector.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fault detection method and device for a high-voltage connector of a power battery and an automobile, which are used for detecting the fault of poor contact of the high-voltage connector of the power battery and avoiding the problem of huge potential safety hazard caused by the fault of poor contact caused by aging and vibration loosening of the high-voltage connector of the power battery.
According to one aspect of the invention, a method for detecting a fault of a high-voltage connector of a power battery is provided, and the method comprises the following steps:
acquiring a first voltage signal through a first port of a high-voltage connector state detection circuit, and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit; and
acquiring a vehicle speed value of a vehicle where a power battery is located;
filtering the first voltage signal to obtain a first filtered signal, and filtering the second voltage signal to obtain a second filtered signal;
when the vehicle speed value is judged to be higher than a first preset vehicle speed value, calculating a first state parameter K according to the first filtering signal and the second filtering signalz；
According to the first state parameter KzAnd carrying out fault detection on the high-voltage connector of the power battery.
Optionally, the method further includes:
and when the power battery high-voltage connector fault is detected, carrying out fault processing on the power battery high-voltage connector according to a fault processing strategy to obtain a processing result.
Optionally, the filtering the first voltage signal to obtain a first filtered signal includes:
and carrying out average value filtering processing on the first voltage signal to obtain a first filtering signal.
Optionally, the filtering the second voltage signal to obtain a second filtered signal includes:
and carrying out average value filtering processing on the second voltage signal to obtain a second filtering signal.
Alternatively to this, the first and second parts may,calculating a first state parameter K from the first filtered signal and the second filtered signalzThe method comprises the following steps:
calculating the first state parameter K according to the deviation of the first filtering signal and the second filtering signal of the first K control periods and a first ideal signalz；
Wherein k is a positive integer;
the first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state.
Optionally, according to the first state parameter KzCarry out power battery high voltage connector fault detection, include:
if the first state parameter KzGreater than a first parameter threshold KminAnd a duration greater than a first time threshold TminDetecting the occurrence of the fault of the high-voltage connector of the power battery; otherwise, detecting that no power battery high-voltage connector fault occurs;
wherein, Kmin>0。
Optionally, the fault processing is performed on the power battery high-voltage connector according to a fault processing strategy to obtain a processing result, including:
generating first prompt information for reminding a fault state, and sending the first prompt information through an instrument; and/or
According to the first state parameter KzCalculating a first power value PmaxAnd limiting the maximum allowable output power of the power battery to the first power value Pmax。
Optionally, according to the first state parameter KzCalculating a first power value PmaxThe method comprises the following steps:
according to the first state parameter KzCalculating the maximum allowable output current I of the power battery;
calculating a first power value P based on the maximum allowable output current Imax。
Optionally, according to the first state parameter KzCalculating movementThe maximum allowable output current I of the force battery comprises:
the first state parameter K iszPerforming boundary limitation to obtain a second state parameter Kf；
Wherein the first state parameter KzThe maximum bound value being limited to a second parameter threshold KmaxSaid first state parameter KzThe limited minimum boundary value is the first parameter threshold value Kmin；
According to the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, according to the second state parameter KfAnd calculating the maximum allowable output current I of the power battery, comprising the following steps:
setting a first current threshold ImaxAnd a second current threshold Imin；
Wherein the first current threshold ImaxThe second current threshold value I represents the maximum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power batteryminThe minimum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery is represented;
according to the first current threshold ImaxAnd a second current threshold IminAnd the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, a first power value P is calculated according to the maximum allowable output current ImaxThe method comprises the following steps:
acquiring first voltage information of a power battery, wherein the first voltage information comprises: the method comprises the steps that the external voltage of a power battery at the current moment and a preset first voltage residual value are obtained;
calculating a first power value P based on the first voltage information and the maximum allowable output current Imax。
Optionally, a first power value P is calculated according to the first voltage information and the maximum allowable output current ImaxThe method comprises the following steps:
calculating a first difference value between the external voltage of the power battery at the current moment and a preset first voltage margin value;
calculating a first power value P according to the first difference value and the maximum allowable output current Imax。
According to a second aspect of the present invention, there is provided a power battery high-voltage connector fault detection device, comprising:
the first acquisition module is used for acquiring a first voltage signal through a first port of the high-voltage connector state detection circuit and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit; and
the second acquisition module is used for acquiring the speed value of the vehicle where the power battery is located;
the first processing module is used for carrying out filtering processing on the first voltage signal to obtain a first filtering signal and carrying out filtering processing on the second voltage signal to obtain a second filtering signal;
the calculation module is used for calculating a first state parameter K according to the first filtering signal and the second filtering signal when the vehicle speed value is judged to be higher than a first preset vehicle speed valuez；
A detection module for detecting the first state parameter KzAnd carrying out fault detection on the high-voltage connector of the power battery.
Optionally, the apparatus further comprises:
and the second processing module is used for carrying out fault processing on the power battery high-voltage connector according to a fault processing strategy when the power battery high-voltage connector fault is detected to occur, so as to obtain a processing result.
Optionally, the first processing module includes:
and the first processing submodule is used for carrying out average value filtering processing on the first voltage signal to obtain a first filtering signal.
Optionally, the first processing module further includes:
and the second processing submodule is used for carrying out average value filtering processing on the second voltage signal to obtain a second filtering signal.
Optionally, the calculation module includes:
a first calculation submodule for calculating the first state parameter K according to the deviations of the first filtered signal and the second filtered signal of the first K control periods from a first ideal signalz；
The first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state.
Optionally, the detection module includes:
a first detection submodule for detecting the first state parameter K if the first state parameter K is greater than the first threshold valuezGreater than a first parameter threshold KminAnd a duration greater than a first time threshold TminDetecting the occurrence of the fault of the high-voltage connector of the power battery; otherwise, detecting that no power battery high-voltage connector fault occurs;
wherein, Kmin>0。
Optionally, the second processing module includes:
the third processing submodule is used for generating first prompt information for prompting a fault state and sending the first prompt information through the instrument; and/or
A fourth processing submodule for processing the first state parameter K according to the first state parameter KzCalculating a first power value PmaxAnd limiting the maximum allowable output power of the power battery to the first power value Pmax。
Optionally, the fourth processing sub-module includes:
a first processing unit for processing the first state parameter KzCalculating the maximum allowable output current I of the power battery;
a second processing unit for calculating a first power value P based on the maximum allowable output current Imax。
Optionally, the first processing unit includes:
a first processing subunit for processing the first state parameter KzPerforming boundary limitation to obtain a second state parameter Kf；
Wherein the first state parameter KzThe maximum bound value being limited to a second parameter threshold KmaxSaid first state parameter KzThe limited minimum boundary value is the first parameter threshold value Kmin；
A second processing subunit for processing the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, the second processing subunit is further specifically configured to set a first current threshold ImaxAnd a second current threshold Imin(ii) a Wherein the first current threshold ImaxThe second current threshold value I represents the maximum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power batteryminThe minimum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery is represented; according to the first current threshold ImaxAnd a second current threshold IminAnd the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, the second processing unit includes:
the third processing subunit is used for acquiring first voltage information of the power battery, and the first voltage information comprises: the method comprises the steps that the external voltage of a power battery at the current moment and a preset first voltage residual value are obtained;
a fourth processing subunit, configured to calculate a first power value P according to the first voltage information and the maximum allowable output current Imax。
Optionally, the fourth processing subunit may be further specifically configured to calculate a first difference between an external voltage of the power battery at the current time and a preset first voltage margin value; calculating a first power value P according to the first difference value and the maximum allowable output current Imax。
According to a third aspect of the present invention, there is provided an automobile, which includes a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program to implement the steps of the method for detecting the failure of the high-voltage connector of the power battery.
In a fourth aspect of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method for detecting the fault of the high-voltage connector of the power battery.
The embodiment of the invention has the beneficial effects that:
in the scheme, a first voltage signal is obtained through a first port of a high-voltage connector fault detection circuit, and a second voltage signal is obtained through a second port of the high-voltage connector fault detection circuit; acquiring a vehicle speed value of a vehicle where the power battery is located; filtering the first voltage signal to obtain a first filtered signal, and filtering the second voltage signal to obtain a second filtered signal; when the vehicle speed value is judged to be higher than a first preset vehicle speed value, calculating a first state parameter K according to the first filtering signal and the second filtering signalz(ii) a According to the first state parameter KzAnd carrying out fault detection on the high-voltage connector of the power battery. The method and the device have the advantages that the fault of poor contact of the high-voltage connector of the power battery is detected, and the problem of huge potential safety hazard caused by the fault of poor contact caused by aging and vibration loosening of the high-voltage connector of the power battery is avoided.
Drawings
FIG. 1 is a diagram of a high voltage connector condition detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a high-voltage interlocking connector according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for detecting a fault in a high-voltage connector of a power battery according to an embodiment of the invention;
FIG. 4 is a second flowchart of a method for detecting a fault in a high-voltage connector of a power battery according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power battery high-voltage connector fault detection device according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Before describing the method for detecting and processing the aging and vibration loosening faults of the high-voltage connector of the power battery of the pure electric vehicle in detail, firstly, a state detection circuit (namely a high-voltage interlocking fault detection circuit) of the existing high-voltage connector and the high-voltage connector are simply described.
Referring to fig. 1, a conventional high voltage connector condition detection circuit is schematically shown. The ports Lock _0 and Lock _1 in FIG. 1 are connected to the high voltage connectors on the vehicle, and the circuit at 3 in FIG. 1 is open when the high voltage connectors are in the open state; when the high-voltage connector is in a firmly plugged state, the switch circuit at 3 is in a closed conducting state, i.e. the detection point 1 and the detection point 2 shown in fig. 1 are in a short-circuit state. IN fig. 1, R0 is equal to R1, R2 is equal to R3, and C0 is the same as C1, as shown IN fig. 1, a Lock _0 port is pulled up by a resistor with a resistance of R0 (Vcc is a power supply voltage, IN this embodiment, the voltage is 5V), a voltage signal of the port enters an a/D acquisition terminal (IN0) inside the vehicle controller after passing through an RC filter circuit composed of a resistor (R2) and a capacitor (C0), similarly, a Lock _1 port is pulled down by a resistor with a resistance of R1 (GND is a power ground), and a voltage signal of the port enters an a/D acquisition terminal (IN1) inside the motor controller after passing through an RC filter circuit composed of a resistor (R3) and a capacitor (C1). The vehicle controller judges the connection and disconnection states of the high-voltage connector according to the voltages at the A/D acquisition points IN0 and IN 1. Further, IN the state that the high-voltage connectors are tightly plugged, the voltages at IN0 and IN1 should be 50% of the Vcc power supply voltage, i.e. 2.5V (ignoring the ideal situation under interference and power supply accuracy error); IN the state where the high voltage connector is open, the voltage at IN0 should be pulled up to Vcc supply voltage, i.e., 5V, and the voltage at IN1 should be pulled down to power ground, i.e., 0V (ignoring ideal conditions under interference, power accuracy errors). Based on the principle, the detection of the state of the high-voltage connector can be realized by judging two paths of low-voltage signals.
As shown in fig. 2, which shows a schematic cross-sectional structure of the high-voltage interlocking connector (corresponding to the dashed-line frame in fig. 1), when the high-voltage connector is plugged, the connections of the "+" and "-" poles of the dc bus in the high-voltage connector are conducted, and the low-voltage signal contacts Lock _0 and Lock _1 are closed to form a loop (corresponding to fig. 1). As can be seen from fig. 2, the length of the pin S2 in the low-voltage detection circuit of the connector is shorter than the length of the pin S1 corresponding to the + and-poles of the high-voltage bus, so that the low-voltage bus can be disconnected in advance before the high-voltage bus completely falls off, especially before the + and-poles of the high-voltage bus are disconnected, and thus, the fault detection provided by the invention can be supported in time and state. The method for detecting the fault of the high-voltage connector of the power battery is based on the existing high-voltage connector and the state detection circuit shown in figures 1 and 2.
As shown in fig. 3, an embodiment of the present invention provides a method for detecting a failure of a high-voltage connector of a power battery, where the method includes:
and step 11, acquiring a first voltage signal through a first port of the high-voltage connector state detection circuit, and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit.
IN this embodiment, the first port of the high voltage connector status detection circuit may correspond to the A/D acquisition point IN0 of FIG. 1 and the second port of the high voltage connector status detection circuit may correspond to the A/D acquisition point IN1 of FIG. 1. The acquired first voltage signal Uint0And a second voltage signal Uint1Is a low voltage signal.
And step 12, acquiring a vehicle speed value of the vehicle where the power battery is located.
In this embodiment, the invention is directed to the fault of poor contact caused by aging, vibration loosening and the like of the high-voltage connector of the power battery, and the fault detection needs to be carried out under the condition of dynamic motion of the vehicle, that is, the fault detection is only practical when the high-voltage connector is in a vibration state, that is, when the high-voltage connector is in the vibration state, two paths of low-voltage signals of the high-voltage connector can reflect the actual contact condition of the connector, so that the vehicle speed value of the vehicle where the power battery is located needs to be obtained, and the vehicle speed value of the vehicle is used as the condition for judging whether the fault detection is started or not.
And step 13, filtering the first voltage signal to obtain a first filtered signal, and filtering the second voltage signal to obtain a second filtered signal.
In this embodiment, the first voltage signal U is generatedint0And a second voltage signal Uint1Respectively filtering to obtain first filtering signals U0And a second filtered signal U1And interference signals doped in the signal acquisition process are filtered, and the reliability of the first voltage signal and the second voltage signal is improved through filtering.
In this embodiment, it is only practical to perform fault detection when the high-voltage connector is in a vibration state, that is, when the high-voltage connector is in a vibration state, the two low-voltage signals of the high-voltage connector can reflect the actual contact condition of the connector, where preferably, the first preset vehicle speed value is selected to be 10km/h, that is, when the vehicle speed value is higher than 10km/h, the calculation of the first state parameter K according to the first filtering signal and the second filtering signal is startedzThe step (2). Otherwise, continuously detecting and judging the fault condition.
Further, as shown IN fig. 1 and 2, under the premise that the high-voltage connectors are tightly plugged, the voltages at IN0 and IN1 should be 50% of the Vcc power supply voltage, i.e. 2.5V (ideal conditions under interference and power supply accuracy error are ignored), so that the first filtered signal U is obtained by filtering the first voltage signal and the second voltage signal respectively IN step 130And a second filtered signal U1Will stabilize in the vicinity of 2.5V, will not produce the great fluctuation; however, if the connector is not tightly plugged due to aging, loosening and other factors, the first filtering signal U is generated0And a second filtered signal U1The invention provides a concept of contact state parameter of high-voltage connector based on the characteristic of high-voltage connector, and calculates a first state parameter K according to the first filtering signal and the second filtering signalzTo complete subsequent failure determination.
In this embodiment, by being dependent on the first state parameter KzThe numerical index quantification of the connection tightness degree of the butting plug-in connector is realized, and the quantified index can be used for detecting the fault of the high-voltage plug-in connector of the power battery and also provides powerful help for the performance evaluation of the high-voltage plug-in connector. Specifically, when the first state parameter K iszWhen it is smaller, it indicates that the high-voltage connector is in good condition (tight connection), and if K is setzIf the size is larger, the plugging degree of the high-voltage connector is reduced due to aging of the connector, vibration loosening and the like.
As shown in fig. 4, in an alternative embodiment of the present invention, the method further includes:
and step 16, when the power battery high-voltage connector fault is detected, carrying out fault processing on the power battery high-voltage connector according to a fault processing strategy to obtain a processing result.
In the embodiment, when the fault of the high-voltage connector of the power battery is detected, the safety of the vehicle and personnel on the vehicle is ensured by an effective fault processing method.
In an optional embodiment of the present invention, in step 13, the filtering the first voltage signal to obtain a first filtered signal includes: and carrying out average value filtering processing on the first voltage signal to obtain a first filtering signal. Filtering the second voltage signal to obtain a second filtered signal, including: and carrying out average value filtering processing on the second voltage signal to obtain a second filtering signal.
In this embodiment, the low-voltage signal of the two collected high-voltage connectors, i.e. the first voltage signal U, is usedint0And a second voltage signal Uint1The average filtering process is performed a plurality of times, and here, the average filtering process may be preferably performed 8 times. The mean value filtering is adopted instead of Kalman or low-pass filtering, so that the original state of the acquired signal is kept as much as possible, and the connector contact state parameter obtained by calculation in the subsequent link can be ensured to truly reflect the connector state. The specific filtering formula may be as follows:
in the formula (1), U0And U1Respectively representing said first and second filtered signals, Uint0And Uint1Respectively representing the first and second voltage signals.
In an optional embodiment of the present invention, step 14 may include:
calculating the first state parameter K according to the deviation of the first filtering signal and the second filtering signal of the first K control periods and a first ideal signalz；
Wherein k is a positive integer; the first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state.
In particular, the first state parameter K may be calculated from an average sum of squared deviations of the first filtered signal and the second filtered signal from a first ideal signal over the first K control periodsz(ii) a The detailed formula is specifically expressed as follows:
by the formula
Calculating a first state parameter;
wherein, KzRepresenting a first state parameter, U0Representing the first filtered signal, U1And representing a second filtering signal, wherein n represents an nth control period, k is a control period parameter and is a positive integer, a is a voltage value of a first port of a high-voltage connector of the power battery in a non-fault state, b is a voltage value of a second port of the high-voltage connector of the power battery in the non-fault state, and namely a and b are the first ideal signal.
In this embodiment, the first filtered signal U obtained by filtering the low-voltage signals of the two connectors in the first k control periods through the average value is used0And a second filtered signal U1Calculating the average sum of the squares of the deviations of the voltage values in the ideal state to obtain a contact state parameter K of the high-voltage connector of the power batteryzHere, the voltage value in the ideal state refers to the voltage value at the first port and the second port when the high-voltage connector of the power battery is in a non-failure state (the high-voltage connector is tightly plugged), i.e., a and b in the formula. Since the voltages at IN0 and IN1 should be 50% of the Vcc power supply voltage under the premise that the high-voltage connector is tightly plugged, the voltages at IN0 and IN1 are 2.5V (ignoring the ideal situation of interference and power supply accuracy error) when the voltage value of Vcc is 5V, that is, a and b are 2.5V respectively when the voltage value of Vcc is 5V.
The contact state parameter K of the high-voltage connector is calculated by the methodzCan effectively reflect the contact state of the high-voltage connector when KzWhen it is smaller, it indicates that the high-voltage connector is in good condition (tight connection), and if K is setzIf the size is larger, the plugging degree of the high-voltage connector is reduced due to aging of the connector, vibration loosening and the like. According to the embodiment, the numerical index quantification of the connection tightness degree of the butting plug-in connector is realized by calculating the first state parameter, and the quantified index can be used for subsequent fault judgment and also provides powerful help for performance evaluation of the high-voltage plug-in connector。
In an alternative embodiment of the present invention, step 15 includes:
if the first state parameter KzGreater than a first parameter threshold KminAnd a duration greater than a first time threshold TminDetecting the occurrence of the fault of the high-voltage connector of the power battery; otherwise, detecting that no power battery high-voltage connector fault occurs; wherein, Kmin>0。
In the embodiment, the fault judgment is realized according to the contact state parameter and the duration time of the high-voltage battery connector, specifically, when the parameter K iszSatisfy Kz>KminThe condition is satisfied while the duration exceeds TmIn which K ismin>And when 0, judging that the high-voltage connector of the power battery is aged and the vibration loosening fault occurs. Wherein K is a fault determination conditionminAnd TmCan be determined by real vehicle calibration, and requires the simultaneous duration to exceed TmThe purpose is to eliminate the abnormal condition of the special working condition.
In an alternative embodiment of the present invention, step 16 may include: generating first prompt information for reminding a fault state, and sending the first prompt information through an instrument; and/or according to said first state parameter KzCalculating a first power value PmaxAnd limiting the maximum allowable output power of the power battery to the first power value Pmax。
In the embodiment, the fault processing method is realized by two aspects, namely, the vehicle instrument is reminded, namely, the vehicle fault is reminded to a driver by methods such as an instrument fault lamp and a text prompt, and the influence of the fault on driving is informed, so that the driver can make psychological expectation on subsequent fault behaviors (such as the vehicle actively limits power output) of the vehicle, and the driving experience is prevented from being further negatively influenced by factors such as power limitation; on the other hand, the output current of the power battery is actively limited, namely the output power is limited, so that the arc discharge and even the burning of the high-voltage connector under the high-current working condition caused by the fault are prevented.
It is worth explaining that, after the fault is triggered, the instrument reminds the personnel on the vehicle by adopting the following method:
firstly, lighting a fault lamp of the whole vehicle system;
secondly, alarming sound and short ringing;
thirdly, prompting a driver by instrument characters: when the vehicle breaks down, in order to ensure safety, the power output of the vehicle is limited, and a user asks for driving at a constant speed and goes to a professional maintenance organization to check the vehicle as soon as possible.
In the invention, the driver is reminded by means of instrument sound, alarm lamp and text prompt, so that the vehicle fault information can be effectively transmitted to the personnel on the vehicle, and the vehicle driving safety is guaranteed.
Further, in an optional embodiment of the present invention, according to the first state parameter KzCalculating a first power value PmaxThe method comprises the following steps: according to the first state parameter KzCalculating the maximum allowable output current I of the power battery; calculating a first power value P based on the maximum allowable output current Imax。
In this embodiment, in a fault state, the output power of the power battery needs to be limited to ensure the safety of personnel on the vehicle and the vehicle, so as to prevent the irreversible impact damage of the high-voltage connector which is not firmly contacted by the excessive output current. That is, by limiting the current flow through the power cell high voltage connector, the "arcing" and resulting risk of connector burn out due to poor contact of the high voltage connector is prevented. Further, in this embodiment, the limitation on the output power of the power battery is essentially caused by the limitation on the output current of the power battery, and for this reason, the embodiment first determines, according to the power battery high-voltage connector contact state parameter obtained in the fault detection determination step, that is, the first state parameter KzCalculating the allowable output current of the power battery, namely the maximum allowable output current I, and obtaining the maximum allowable output power of the power battery according to the voltage of the power battery on the basis, namely the first power value Pmax。
Specifically, in an optional embodiment of the present invention, according to the first state parameter KzCalculating movementThe maximum allowable output current I of the force battery comprises:
the first state parameter K iszPerforming boundary limitation to obtain a second state parameter Kf；
Wherein the first state parameter KzThe maximum bound value being limited to a second parameter threshold KmaxSaid first state parameter KzThe limited minimum boundary value is the first parameter threshold value Kmin；
Specifically, for the first state parameter KzPerforming boundary limitation to obtain a second state parameter KfThe process of (2) can be detailed as follows:
by the formula
And K ismax>Kmin>0, calculating to obtain a second state parameter Kf；
Wherein the second parameter threshold KmaxRepresenting said first state parameter KzA limited maximum boundary value, the first parameter threshold value KminRepresenting said first state parameter KzA limited minimum boundary value;
further, according to the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
In this embodiment, the first state parameter K is obtained by calculating the contact state parameter of the power battery connectorzPerforming boundary line system to obtain a second state parameter KfFrom the above formula, it can be seen that the first state parameter K iszIs limited to [ K ]min，Kmax]Interval, further, according to the second state parameter K obtainedfAnd calculating the maximum allowable output current I of the power battery.
Specifically, in an optional embodiment of the present invention, the second state parameter K is determined according to the second state parameter KfAnd calculating the maximum allowable output current I of the power battery, comprising the following steps:
setting a first current threshold ImaxAnd a second current threshold Imin(ii) a Wherein the first current threshold ImaxThe second current threshold value I represents the maximum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power batteryminThe minimum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery is represented;
according to the first current threshold ImaxAnd a second current threshold IminAnd the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Further, the step of calculating the maximum allowable output current I of the power battery may be specifically calculated by the following formula:
by the formula
Calculating the maximum allowable output current I of the power battery;
wherein, I represents the maximum allowable output current of the power battery, and a first current threshold ImaxA second current threshold I representing the maximum current value allowed to be output by the power battery in the fault stateminIndicating the minimum current value, I, allowed to be output by the power battery in the fault statemax＞Imin＞0，KfRepresenting said second state parameter, a second parameter threshold KmaxRepresenting said first state parameter KzA limited maximum boundary value, the first parameter threshold value KminExpressed as said first state parameter KzLimited minimum boundary value, KfRepresenting a second state parameter, Kmax>Kmin>0。
In this embodiment, the maximum allowable output current range of the power battery is first defined as [ Imin，Imax](Imax>Imin>0) Namely, the allowable output current of the power battery in the fault state is not allowed to exceed the range, and specific judgment is given according to the first current threshold I when the high-voltage plug connector fault of the power battery occursmaxAnd a second current threshold IminAnd the second state parameter KfCalculating power batteryThe maximum allowed output current I.
Furthermore, according to the calculation formula for calculating the maximum allowable output current I of the power battery, the contact state parameters of the power battery connector are obtained. I.e. the second state parameter KfFrom KminStepwise increase to KmaxIn the process, the maximum allowable discharge current of the power battery is as followsmaxLinearly down to IminIn which IminAnd ImaxDetermined by real vehicle calibration.
In an alternative embodiment of the invention, the first power value P is calculated on the basis of said maximum allowed output current ImaxThe method comprises the following steps: acquiring first voltage information of a power battery, wherein the first voltage information comprises: the method comprises the steps that the external voltage of a power battery at the current moment and a preset first voltage residual value are obtained; calculating a first power value P based on the first voltage information and the maximum allowable output current Imax。
In this embodiment, after obtaining the maximum allowable discharge current of the power battery in the fault state, i.e. the maximum allowable output current I, the maximum allowable output power, i.e. the first power value P, is calculated by using the external voltage of the power battery at the present momentmax。
Specifically, in an optional embodiment of the present invention, a first power value P is calculated according to the first voltage information and the maximum allowable output current ImaxThe method comprises the following steps:
calculating a first difference value between the external voltage of the power battery at the current moment and a preset first voltage margin value; calculating a first power value P according to the first difference value and the maximum allowable output current Imax。
Further, the first power value PmaxThe calculation of (d) can be detailed as follows:
by the formula Pmax＝I×(UDC- Δ U), calculating a first power value Pmax；
Wherein, PmaxRepresenting a first power value, UDCRepresents the external voltage of the power battery at the current moment, delta U represents a first voltage residual value, UDC- Δ U represents said first difference valueAnd I represents the maximum allowable output current of the power battery in the fault state.
In the embodiment, the unexpected increase of the output power of the power battery caused by the voltage fluctuation of the direct current bus is eliminated by subtracting a certain margin on the basis of the external voltage of the power battery, namely, the discharging current of the power battery is prevented from exceeding the expected value I. Further, the first power value P is calculatedmaxThe invention is not related to the concrete realization of energy management, and is used for energy management distribution of vehicles, such as power distribution of a driving system, function management of an air conditioning system and the like.
As shown in fig. 5, the present invention also provides an apparatus for implementing the above method.
As shown in fig. 5, it shows a power battery high-voltage connector fault detection device provided by the present invention, the device 500 includes:
a first obtaining module 501, configured to obtain a first voltage signal through a first port of the high-voltage connector state detection circuit, and obtain a second voltage signal through a second port of the high-voltage connector state detection circuit; and
a second obtaining module 502, configured to obtain a vehicle speed value of a vehicle in which the power battery is located;
the first processing module 503 is configured to filter the first voltage signal to obtain a first filtered signal, and filter the second voltage signal to obtain a second filtered signal;
a calculating module 504, configured to calculate a first state parameter K according to the first filtering signal and the second filtering signal when it is determined that the vehicle speed value is higher than a first preset vehicle speed valuez；
A detecting module 505 configured to detect the first state parameter K according to the first state parameter KzAnd carrying out fault detection on the high-voltage connector of the power battery.
Optionally, the apparatus 500 further includes:
and the second processing module is used for carrying out fault processing on the power battery high-voltage connector according to a fault processing strategy when the power battery high-voltage connector fault is detected to occur, so as to obtain a processing result.
Optionally, the first processing module 503 includes:
and the first processing submodule is used for carrying out average value filtering processing on the first voltage signal to obtain a first filtering signal.
Optionally, the first processing module 503 further includes:
and the second processing submodule is used for carrying out average value filtering processing on the second voltage signal to obtain a second filtering signal.
Optionally, the calculating module 504 includes:
a first calculation submodule for calculating the first state parameter K according to the deviations of the first filtered signal and the second filtered signal of the first K control periods from a first ideal signalz；
Wherein k is a positive integer; the first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state.
Optionally, the detecting module 505 includes:
a first detection submodule for detecting the first state parameter K if the first state parameter K is greater than the first threshold valuezGreater than a first parameter threshold KminAnd a duration greater than a first time threshold TminDetecting the occurrence of the fault of the high-voltage connector of the power battery; otherwise, detecting that no power battery high-voltage connector fault occurs;
wherein, Kmin>0。
Optionally, the second processing module includes:
the third processing submodule is used for generating first prompt information for prompting a fault state and sending the first prompt information through the instrument; and/or
A fourth processing submodule for processing the first state parameter K according to the first state parameter KzCalculating a first power value PmaxAnd limiting the maximum allowable output power of the power battery to the first power value Pmax。
Optionally, the fourth processing sub-module includes:
a first processing unit for processing the first state parameter KzCalculating the maximum allowable output current I of the power battery;
a second processing unit for calculating a first power value P based on the maximum allowable output current Imax。
Optionally, the first processing unit includes:
a first processing subunit for processing the first state parameter KzPerforming boundary limitation to obtain a second state parameter Kf；
Wherein the first state parameter KzThe maximum bound value being limited to a second parameter threshold KmaxSaid first state parameter KzThe limited minimum boundary value is the first parameter threshold value Kmin；
A second processing subunit for processing the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, the second processing subunit is further specifically configured to set a first current threshold ImaxAnd a second current threshold Imin(ii) a Wherein the first current threshold ImaxThe second current threshold value I represents the maximum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power batteryminThe minimum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery is represented; and according to said first current threshold ImaxAnd a second current threshold IminAnd the second state parameter KfAnd calculating the maximum allowable output current I of the power battery.
Optionally, the second processing unit includes:
a third processing subunit, configured to obtain first voltage information of a battery, where the first voltage information includes: the method comprises the steps that the external voltage of a power battery at the current moment and a preset first voltage residual value are obtained;
a fourth processing subunit, configured to calculate a first power value P according to the first voltage information and the maximum allowable output current Imax。
Optionally, the fourth processing subunit may be further specifically configured to calculate a first difference between an external voltage of the power battery at the current time and a preset first voltage margin value; and calculating a first power value P according to the first difference value and the maximum allowable output current Imax。
The device is a device corresponding to the method embodiment, and all implementation manners in the method embodiment are applicable to the device embodiment, and the same technical effects as the method embodiment can be achieved.
In addition, the invention also provides an automobile which comprises a processor, a memory and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the method for detecting the fault of the high-voltage connector of the power battery.
The fault detection method for the high-voltage connector of the power battery is applied to automobiles, particularly electric automobiles, realizes detection of the fault of poor contact of the high-voltage connector of the power battery in the automobiles, and avoids the problem of huge potential safety hazard caused by the fault of poor contact caused by aging and vibration loosening of the high-voltage connector of the power battery. Meanwhile, powerful guarantee is provided for fine control of the pure electric vehicle in future.
In the above scheme, the provided fault detection and processing method includes two aspects, namely fault detection and fault processing. In the aspect of fault detection, firstly, filtering low-voltage detection signals obtained by a state detection circuit of the existing high-voltage connector, then, calculating contact state parameters of the high-voltage connector of the power battery by using the obtained low-voltage signals under the working condition of a certain vehicle speed, and finally, judging faults by using the contact state parameters of the high-voltage connector of the power battery; the contact state parameter of the high-voltage connector of the power battery is specially provided by the invention and is used for evaluating the contact degree of the high-voltage connector under the influence of factors such as aging, vibration and loosening, and the calculation of the parameter is the core content of the invention. After the fault judgment is completed, the power battery is subjected to power-limiting output processing according to the calculated contact state parameters of the high-voltage connector of the power battery, and arc discharge caused by poor contact of the high-voltage connector and the risk of burning the connector caused by the arc discharge are prevented by limiting the circulating current of the high-voltage connector of the power battery; meanwhile, in the process, the fault state of the vehicle is informed to the vehicle personnel through measures such as instrument prompt and the like, so that the vehicle personnel can have psychological expectation on the vehicle power reduction caused by the fault, and the driving safety and the driving feeling are guaranteed. The method for detecting and processing the aging and vibration loosening faults of the high-voltage connector of the power battery provided by the invention is between the fault-free fault and the high-voltage interlocking fault, namely the detection and processing of the fault in the grey zone, and the detection and processing method provides a powerful guarantee for the fine control of the pure electric vehicle in the future; the method has the characteristics of clear thought, clear detection mechanism, less required calculation amount and the like, is very easy to realize engineering, does not involve the change of system hardware, does not increase the system cost, and has good popularization value.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (14)
1. A power battery high-voltage connector fault detection method is characterized by comprising the following steps:
acquiring a first voltage signal through a first port of a high-voltage connector state detection circuit, and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit; and
acquiring a vehicle speed value of a vehicle where a power battery is located;
filtering the first voltage signal to obtain a first filtered signal, and filtering the second voltage signal to obtain a second filtered signal;
when the vehicle speed value is judged to be higher than a first preset valueWhen the vehicle speed value is reached, calculating a first state parameter according to the first filtering signal and the second filtering signal
The method specifically comprises the following steps:
calculating the first state parameter according to the deviation of the first filtered signal and the second filtered signal of the first k control periods and a first ideal signal
；
Wherein k is a positive integer,
which is representative of the first filtered signal and,
representing a second filtering signal, wherein n represents an nth control period, a is a voltage value of a first port of a high-voltage connector of the power battery in a non-fault state, and b is a voltage value of a second port of the high-voltage connector of the power battery in the non-fault state;
the first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state;
according to the first state parameter
And carrying out fault detection on the high-voltage connector of the power battery.
2. The method for detecting the fault of the high-voltage connector of the power battery as claimed in claim 1, further comprising:
and when the power battery high-voltage connector fault is detected, carrying out fault processing on the power battery high-voltage connector according to a fault processing strategy to obtain a processing result.
3. The method for detecting the fault of the high-voltage connector of the power battery according to claim 1, wherein the step of filtering the first voltage signal to obtain a first filtered signal comprises the following steps:
and carrying out average value filtering processing on the first voltage signal to obtain a first filtering signal.
4. The method for detecting the fault of the high-voltage connector of the power battery according to claim 1, wherein the step of filtering the second voltage signal to obtain a second filtered signal comprises the steps of:
and carrying out average value filtering processing on the second voltage signal to obtain a second filtering signal.
5. The method for detecting faults of high-voltage connectors of power batteries according to claim 2, wherein the method is characterized in that the fault detection is carried out according to the first state parameter
Carry out power battery high voltage connector fault detection, include:
if the first state parameter
Greater than a first parameter threshold
And a duration greater than a first time threshold
Detecting the occurrence of the fault of the high-voltage connector of the power battery; otherwise, detecting that no power battery high-voltage connector fault occurs;
wherein,
。
6. the method for detecting the fault of the power battery high-voltage connector according to claim 5, wherein the fault processing is performed on the power battery high-voltage connector according to a fault processing strategy to obtain a processing result, and the method comprises the following steps:
generating first prompt information for reminding a fault state, and sending the first prompt information through an instrument; and/or
According to the first state parameter
Calculating a first power value
And limiting the maximum allowable output power of the power battery to the first power value
。
7. The method for detecting faults of high-voltage connectors of power batteries according to claim 6, wherein the fault detection method is based on the first state parameter
Calculating a first power value
The method comprises the following steps:
according to the first state parameter
Calculating the maximum allowable output current of the power battery
；
According to the maximum allowable output current
Calculating a first power value
。
8. The method for detecting faults of high-voltage connectors of power batteries according to claim 7, wherein the method is characterized in that the fault detection is carried out according to the first state parameter
Calculating the maximum allowable output current of the power battery
The method comprises the following steps:
the first state parameter
Performing boundary limitation to obtain a second state parameter
；
Wherein the first state parameter
The maximum boundary value limited is
The first state parameter
The minimum boundary value to be limited is
；
According to the second state parameter
Calculating the maximum allowable output current of the power battery
。
9. The method for detecting faults of high-voltage connectors of power batteries according to claim 8, wherein the second state parameter is used for detecting faults of high-voltage connectors of power batteries
Calculating the maximum allowable output current of the power battery
The method comprises the following steps:
setting a first current threshold
And a second current threshold
；
Wherein the first current threshold value
The second current threshold value represents the maximum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery
The minimum current value allowed to be output by the power battery in the fault state of the high-voltage connector of the power battery is represented;
according to the first current threshold
And a second current threshold
And the second state parameter
Calculating the maximum allowable output current of the power battery
。
10. The method for detecting the fault of the high-voltage connector of the power battery as claimed in claim 7, wherein the first power value is calculated according to the maximum allowable output current I
The method comprises the following steps:
acquiring first voltage information of a power battery, wherein the first voltage information comprises: the method comprises the steps that the external voltage of a power battery at the current moment and a preset first voltage residual value are obtained;
according to the first voltage information and the maximum allowable output current
Calculating a first power value
。
11. The method for detecting faults of high-voltage connectors of power batteries according to claim 10, wherein the method is characterized in that the first voltage information and the maximum allowable output current are used as the basis
Calculating a first power value
The method comprises the following steps:
calculating a first difference value between the external voltage of the power battery at the current moment and a preset first voltage margin value; according to the first difference value and the maximum allowable output current
Calculating a first power value
。
12. The utility model provides a power battery high voltage connector fault detection device which characterized in that includes:
the first acquisition module is used for acquiring a first voltage signal through a first port of the high-voltage connector state detection circuit and acquiring a second voltage signal through a second port of the high-voltage connector state detection circuit; and
the second acquisition module is used for acquiring the speed value of the vehicle where the power battery is located;
the first processing module is used for carrying out filtering processing on the first voltage signal to obtain a first filtering signal and carrying out filtering processing on the second voltage signal to obtain a second filtering signal;
the calculation module is used for calculating a first state parameter according to the first filtering signal and the second filtering signal when the vehicle speed value is judged to be higher than a first preset vehicle speed value
The method specifically comprises the following steps:
calculating the first state parameter according to the deviation of the first filtered signal and the second filtered signal of the first k control periods and a first ideal signal
；
Wherein k is a positive integer,
which is representative of the first filtered signal and,
representing a second filtering signal, wherein n represents an nth control period, a is a voltage value of a first port of a high-voltage connector of the power battery in a non-fault state, and b is a voltage value of a second port of the high-voltage connector of the power battery in the non-fault state;
the first ideal signal is a voltage signal at the first port and the second port when a high-voltage connector of the power battery is in a non-fault state;
a detection module for detecting the first state parameter
And carrying out fault detection on the high-voltage connector of the power battery.
13. An automobile, characterized in that the automobile comprises a processor, a memory, and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method for detecting the fault of the high-voltage connector of the power battery according to any one of claims 1 to 11.
14. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps of a method for detecting a failure of a high-voltage connector of a power battery according to any one of claims 1 to 11.
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| CN108602450A (en) * | 2016-01-29 | 2018-09-28 | 庞巴迪运输有限公司 | Arrangement with the battery system for providing from electric energy to vehicle |
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| CN106882052A (en) * | 2017-04-13 | 2017-06-23 | 深圳市瀚路新能源汽车有限公司 | High-voltage interlocking loop and high-voltage interlocking loop detector |
| CN108312850A (en) * | 2018-01-31 | 2018-07-24 | 北京国能电池科技股份有限公司 | High-tension connector detection device, method and battery management system |
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