CN109212365B - Method and system for calculating power-off time of new energy automobile - Google Patents
Method and system for calculating power-off time of new energy automobile Download PDFInfo
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Abstract
The invention provides a method and a system for calculating the power-off time of a new energy automobile, wherein the method comprises the following steps: setting a time effective flag bit of TBOX, wherein the time effective flag bit is 1 when the TBOX is in a normal working state, and the time effective flag bit is 0 when the TBOX is in a failure state; acquiring the power-on initial time of the TBOX, and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0; when the effective marker bit of the TBOX time is 0, starting the vehicle control unit to time the failure accumulated time; calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time; and acquiring the battery working state of the power battery, and calculating the power-off time of the battery according to the battery working state and the absolute time. The invention can improve the safety of the battery management system and the accuracy of battery state estimation.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a method and a system for calculating the power-off time of a new energy automobile.
Background
The power-off time is used as a key core parameter of the new energy automobile and is mainly used for important links such as OCV correction, SOH calculation, battery capacity calculation and the like in new energy battery management, and accurate power-off time calculation is an important guarantee for effective management of the battery, so that the problem of accurate calculation of the power-off time of the vehicle is very important.
At present, the power-off time of a new energy automobile is mainly monitored through a vehicle-mounted terminal TBOX and obtained. However, when the vehicle-mounted terminal TBOX is in a dormant state, a fault state and a disconnection state, the power-off time of the vehicle cannot be acquired, so that the battery management function of the new energy automobile is greatly influenced; meanwhile, in order to avoid the power shortage of a low-voltage storage battery due to leakage current under the condition of long-time shelving, a power-off switch is often installed on some vehicles, the power supply of the whole vehicle is cut off when the vehicle is not parked, a battery management system completely stops working, and at the moment, the vehicle-mounted terminal TBOX cannot accurately acquire the power-off time, so that the SOC state estimation is influenced.
Disclosure of Invention
The invention provides a method and a system for calculating the power-off time of a new energy automobile, which solve the problem that the power-off time of the existing new energy automobile is monitored and obtained mainly through a vehicle-mounted terminal TBOX (tunnel boring machine), and the power-off time is not accurately obtained when the TBOX fails, and can improve the safety of a battery management system and the accuracy of battery state estimation.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for calculating the power-off time of a new energy automobile comprises the following steps:
setting a time effective zone bit of TBOX, wherein the time effective zone bit is 1 when the TBOX is in a normal working state, and the time effective zone bit is 0 when the TBOX is in a failure state;
acquiring the power-on initial time of the TBOX, and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0;
when the time effective zone bit is 0, starting the vehicle control unit to time the failure accumulated time;
calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time;
and acquiring the battery working state of the power battery, and calculating the power-off time of the battery according to the battery working state and the absolute time.
Preferably, the method further comprises the following steps:
when the time effective flag bit is 1, acquiring the effective power-on accumulated time of the TBOX;
and taking the difference value of the effective power-on accumulated time and the power-on initial time as the absolute time.
Preferably, the calculating the absolute time according to the accumulated power-on time before failure and the accumulated failure time includes:
and if the TBOX fails and recovers in the power-on process, the absolute time is equal to the sum of the power-on accumulated time before failure and the failure accumulated time.
Preferably, the calculating according to the accumulated power-on time before failure and the accumulated failure time to obtain the absolute time further includes:
if the TBOX fails and is not recovered in the power-on process at this time, acquiring the power-off time of the whole vehicle, and calculating to obtain the difference between the failure accumulated time and the power-off time of the whole vehicle, wherein the absolute time is equal to the sum of the power-on accumulated time before failure and the difference.
The invention also provides a system for calculating the power-off time of the new energy automobile, which comprises the following steps:
the setting unit is used for setting a TBOX time effective zone bit, wherein the time effective zone bit is 1 when the TBOX is in a normal working state, and the time effective zone bit is 0 when the TBOX is in a failure state;
the TBOX time acquisition unit is used for acquiring the power-on initial time of the TBOX and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0;
the failure time acquisition unit is used for starting the vehicle control unit to time the failure accumulated time when the TBOX time effective flag bit is 0;
the absolute time calculation unit is used for calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time;
and the power-off time calculation unit is used for acquiring the battery working state of the power battery and calculating the power-off time of the battery according to the battery working state and the absolute time.
Preferably, the TBOX time obtaining unit is further configured to obtain an effective power-on accumulated time of the TBOX when the time effective flag is 1;
the absolute time calculating unit is further configured to use a difference between the effective power-on accumulated time and the power-on initial time as the absolute time.
Preferably, the absolute time calculation unit includes:
and the first calculating unit is used for taking the sum of the power-on accumulated time before failure and the power-on accumulated time before failure as the absolute time when the TBOX fails and recovers in the power-on process.
Preferably, the absolute time calculating unit further includes:
and the second calculating unit is used for calculating to obtain a difference value between the failure accumulated time and the power failure time of the whole vehicle by acquiring the power failure time of the whole vehicle when the TBOX fails and is not recovered in the power-on process at this time, and taking the sum of the power-on accumulated time before failure and the difference value as the absolute time.
The invention provides a method and a system for calculating the power-off time of a new energy automobile, wherein the power-off time of a whole automobile is calculated by setting a TBOX time effective zone bit, acquiring the TBOX accumulated power-on time when the time effective zone bit is 1, and acquiring the failure accumulated time obtained by timing of a whole automobile controller when the time effective zone bit is 0. The problem that the power-off time of the existing new energy automobile is monitored and obtained mainly through a vehicle-mounted terminal TBOX (tunnel boring machine), and the power-off time is inaccurate when the TBOX fails is solved, and the safety of a battery management system and the accuracy of battery state estimation can be improved.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the invention provides a flow chart of a method for calculating the power-off time of a new energy automobile.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The problem that the power-off time acquisition is inaccurate when TBOX fails and faults are prone to occurring due to the fact that the current new energy vehicle is monitored only by the TBOX when the power-off time acquisition is carried out. The invention provides a method and a system for calculating the power-off time of a new energy automobile, wherein the power-off time of a whole automobile is calculated by setting a TBOX time effective zone bit, acquiring the TBOX accumulated power-on time when the time effective zone bit is 1, and acquiring the failure accumulated time obtained by timing of a whole automobile controller when the time effective zone bit is 0. The problem that the power-off time of the existing new energy automobile is monitored and obtained mainly through a vehicle-mounted terminal TBOX (tunnel boring machine), and the power-off time is inaccurate when the TBOX fails is solved, and the safety of a battery management system and the accuracy of battery state estimation can be improved.
As shown in fig. 1, a method for calculating a power-off time of a new energy vehicle includes:
s1: and setting a time effective zone bit of the TBOX, wherein the time effective zone bit is 1 when the TBOX is in a normal working state, and the time effective zone bit is 0 when the TBOX is in a failure state.
S2: and acquiring the power-on initial time of the TBOX, and acquiring the power-on accumulated time before the failure of the TBOX when the time valid flag bit is changed from 1 to 0.
S3: and when the time effective zone bit is 0, starting the vehicle control unit to time the failure accumulated time.
S4: and calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time.
S5: and acquiring the battery working state of the power battery, and calculating the power-off time of the battery according to the battery working state and the absolute time.
Specifically, a time effective zone bit is arranged on the TBOX, accumulated power-on time is obtained through the TBOX when the time effective zone bit is 1, and invalid accumulated power-on time is obtained through timing by an MCU in a vehicle control unit when the time effective zone bit is 0, so that power-off time of the whole vehicle is obtained, accurate power-off time of the vehicle can be calculated at a TBOX invalid stage, influence of functional stability of electronic elements of the TBOX on accurate calculation of the power-off time is reduced, and complete dependence on the TBOX is avoided; meanwhile, the strategy method can realize calibration of power-off time data acquired by the TBOX, further improve the accuracy of the power-off time of the vehicle and ensure effective realization of the battery management function of the new energy automobile.
Further, the method also includes:
s6: and when the time valid flag bit is 1, acquiring the valid power-on accumulated time of the TBOX.
S7: and taking the difference value of the effective power-on accumulated time and the power-on initial time as the absolute time.
In practical application, after the whole vehicle is powered on, the corresponding time effective flag bit is xxxflag (such as invalid _ flag, server _ flag, GPS _ flag and affected _ flag) according to the TBOX time source, and the power-on initial time of the TBOX is obtained. The time validity (the validity of year, month, day and the like) of xxxflag and Tbox is used as a detection parameter for detecting whether TBOX fails, a TBOX validity flag bit Tbox _ changed _ flag is output, the flag bit is 0 to indicate that TBOX is in a failure state, and after a VCU of the vehicle controller receives the TBOX failure state flag bit 0, the VCU of the vehicle controller marks the position 1 of an MCU _ changed _ flag to start an MCU timing function so as to obtain the accumulated power-on time from the beginning of TBOX failure to the current, and the accumulated power-on time is recorded as the accumulated power-on time; if the output TBOX validity flag bit TBOX _ changed _ flag is 1, the TBOX is judged to work normally, and after receiving the TBOX failure state flag bit 1, the VCU sends out an MCU _ changed _ flag bit of 0, and the MCU timing function is stopped.
Calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time, wherein the calculating comprises the following steps: and if the TBOX fails and recovers in the power-on process, the absolute time is equal to the sum of the power-on accumulated time before failure and the failure accumulated time.
Calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time, and further comprising: if the TBOX fails and is not recovered in the power-on process at this time, acquiring the power-off time of the whole vehicle, and calculating to obtain the difference between the failure accumulated time and the power-off time of the whole vehicle, wherein the absolute time is equal to the sum of the power-on accumulated time before failure and the difference.
In practical application, if TBOX fails and recovers in the power-on process, the power-on initial time T0 of TBOX is recorded, the power-on accumulated time T1 before TBOX fails is recorded, the MCU timing function is started after TBOX fails to record the MCU accumulated time △ T, when TBOX recovers to work, the current time T2 is recorded, T0+ T1+ △ T and T2 can be mutually calibrated, if the deviation is large, T1+ △ T is used as the accumulated power-on time before TBOX recovers, T2 is used as the power-on time after TBOX recovers to the power-off, and T1+ △ T) + T2 is recorded.
If TBOX fails in the power-on process, recovering in the next power-on process, recording the initial power-on time T0 at this time, accumulating the power-on time T1 before TBOX fails, starting the MCU after the Tbox fails and recording the MCU accumulated time △ T in a timely function manner, wherein the accumulated power-on time in the power-on process is T1+ △ T, continuing to start the MCU accumulated time △ T2 after the next power-on, recording the current time T2 after the next power-on recovery of TBOX, and recording the accumulated power-on time after the TBOX recovers as T2, wherein the accumulated power-on time of the next power-on is △ T2+ T2, and the total power-on time of two times of power-on is T (T1+ △ T) + (△ T2+ T2).
Recording the initial time T0 of power-on this time, accumulating the power-on time T1 before TBOX fails, starting the MCU after TBOX fails and recording the MCU accumulated time △ T1 in a timely function manner, wherein the accumulated power-on time in the power-on process this time is T1+ △ T, continuing starting the MCU accumulated time △ T2 after the power-on next time until power-off, repeating the third power-on accumulated time △ T3, and the nth power-on accumulated time △ tn. is T1+ △ T1+ △ T2+ △ T3+ … + △ tn before TBOX recovers.
The method comprises the steps of setting a TBOX time effective zone bit, obtaining TBOX accumulated power-on time when the time effective zone bit is 1, obtaining failure accumulated time obtained by timing of a vehicle controller when the time effective zone bit is 0, and further obtaining the power-off time of the vehicle. The problem that the power-off time of the existing new energy automobile is monitored and obtained mainly through a vehicle-mounted terminal TBOX (tunnel boring machine), and the power-off time is inaccurate when the TBOX fails is solved, and the safety of a battery management system and the accuracy of battery state estimation can be improved.
The invention also provides a system for calculating the power-off time of the new energy automobile, which comprises the following steps:
the setting unit is used for setting a time effective flag bit of the TBOX, wherein the time effective flag bit is 1 when the TBOX is in a normal working state, and the time effective flag bit is 0 when the TBOX is in a failure state;
the TBOX time acquisition unit is used for acquiring the power-on initial time of the TBOX and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0;
the failure time acquisition unit is used for starting the vehicle control unit to time the failure accumulated time when the time effective flag bit is 0;
the absolute time calculation unit is used for calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time;
and the power-off time calculation unit is used for acquiring the battery working state of the power battery and calculating the power-off time of the battery according to the battery working state and the absolute time.
Preferably, the TBOX time obtaining unit is further configured to obtain an effective power-on accumulated time of the TBOX when the time effective flag is 1;
the absolute time calculating unit is further configured to use a difference between the effective power-on accumulated time and the power-on initial time as the absolute time.
Preferably, the absolute time calculation unit includes:
and the first calculating unit is used for taking the sum of the power-on accumulated time before failure and the power-on accumulated time before failure as the absolute time when the TBOX fails and recovers in the power-on process.
Preferably, the absolute time calculating unit further includes:
and the second calculating unit is used for calculating to obtain a difference value between the failure accumulated time and the power failure time of the whole vehicle by acquiring the power failure time of the whole vehicle when the TBOX fails and is not recovered in the power-on process at this time, and taking the sum of the power-on accumulated time before failure and the difference value as the absolute time.
The setting unit is used for setting a TBOX time effective flag bit, the TBOX time acquisition unit is used for acquiring TBOX accumulated power-on time when the time effective flag bit is 1, and the failure time acquisition unit is used for acquiring failure accumulated time obtained by timing of the whole vehicle controller when the time effective flag bit is 0, so that the power-off time of the whole vehicle is calculated. The problem that the power-off time of the existing new energy automobile is monitored and obtained mainly through a vehicle-mounted terminal TBOX (tunnel boring machine), and the power-off time is inaccurate when the TBOX fails is solved, and the safety of a battery management system and the accuracy of battery state estimation can be improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (2)
1. A method for calculating the power-off time of a new energy automobile is characterized by comprising the following steps:
setting a time effective zone bit of TBOX, wherein the time effective zone bit is 1 when the TBOX is in a normal working state, and the time effective zone bit is 0 when the TBOX is in a failure state;
acquiring the power-on initial time of the TBOX, and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0;
when the time effective zone bit is 0, starting the vehicle control unit to time the failure accumulated time;
calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time;
when the time effective zone bit is 1, acquiring the effective power-on accumulated time of the TBOX; taking the difference value between the effective power-on accumulated time and the power-on initial time as the absolute time; if the TBOX fails and recovers in the power-on process, the absolute time is equal to the sum of the power-on accumulated time before failure and the failure accumulated time; if the TBOX fails and is not recovered in the power-on process at this time, acquiring the power-off time of the whole vehicle, and calculating to obtain the difference between the failure accumulated time and the power-off time of the whole vehicle, wherein the absolute time is equal to the sum of the power-on accumulated time before failure and the difference;
and acquiring the battery working state of the power battery, and calculating the power-off time of the battery according to the battery working state and the absolute time.
2. A system for calculating the power-off time of a new energy automobile is characterized by comprising:
the setting unit is used for setting a time effective flag bit of the TBOX, wherein the time effective flag bit is 1 when the TBOX is in a normal working state, and the time effective flag bit is 0 when the TBOX is in a failure state;
the TBOX time acquisition unit is used for acquiring the power-on initial time of the TBOX and acquiring the power-on accumulated time before the failure of the TBOX when the time effective zone bit is changed from 1 to 0;
the TBOX time obtaining unit is further used for obtaining the effective power-on accumulated time of the TBOX when the time effective flag bit is 1;
the failure time acquisition unit is used for starting the vehicle control unit to time the failure accumulated time when the time effective flag bit is 0;
the absolute time calculation unit is used for calculating to obtain absolute time according to the accumulated power-on time before failure and the accumulated failure time;
the absolute time calculating unit is further configured to use a difference between the effective power-on accumulated time and the power-on initial time as the absolute time;
the absolute time calculation unit includes: a first calculation unit and a second calculation unit;
the first calculating unit is used for taking the sum of the power-on accumulated time before failure and the power-on accumulated time before failure as the absolute time when the TBOX fails and recovers in the power-on process;
the second calculating unit is used for calculating to obtain a difference value between the failure accumulated time and the power failure time of the whole vehicle by acquiring the power failure time of the whole vehicle when the TBOX fails and is not recovered in the power-on process of the time, and taking the sum of the power-on accumulated time before failure and the difference value as the absolute time; and the power-off time calculation unit is used for acquiring the battery working state of the power battery and calculating the power-off time of the battery according to the battery working state and the absolute time.
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