CN113997788A - Automatic power supply control method for low-voltage storage battery of electric vehicle - Google Patents
Automatic power supply control method for low-voltage storage battery of electric vehicle Download PDFInfo
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- CN113997788A CN113997788A CN202111281383.0A CN202111281383A CN113997788A CN 113997788 A CN113997788 A CN 113997788A CN 202111281383 A CN202111281383 A CN 202111281383A CN 113997788 A CN113997788 A CN 113997788A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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Abstract
The invention discloses an automatic power supply control method for a low-voltage storage battery of an electric automobile, which is used for detecting the SOC value of the low-voltage storage battery and judging whether the power is insufficient; when the low-voltage storage battery is in power shortage and the vehicle is in a defense state, sending a power supplementing request to the VCU; the VCU judges whether a power supplementing condition is met, and when the power supplementing condition is met, high-voltage power-on starts to supplement power for the low-voltage storage battery; after power supply is started, the GW detects the SOC value of the low-voltage storage battery, power supply timing is started, whether power supply stopping conditions are met or not is judged in real time in the power supply process, when the power supply stopping conditions are met, the GW stops sending power supply requests, and power supply is finished. According to the invention, when the electric quantity of the low-voltage storage battery is insufficient, the high-voltage power is automatically supplied to supplement the low-voltage storage battery, so that the power shortage of the low-voltage storage battery is avoided, meanwhile, the high-voltage safety problem is fully considered, and the safety risk caused by automatic power supplement can be avoided.
Description
Technical Field
The invention belongs to the technical field of electric automobile storage batteries, and particularly relates to an automatic power supply control method for a low-voltage storage battery of an electric automobile.
Background
At present, the number of electric equipment on the automobile is increased, the static current during the parking of the automobile is also increased, and in order to ensure that the parking time of the automobile is long enough and avoid the shortage of electricity of the storage battery, the capacity of the storage battery is generally required to be increased, but the cost and the weight of the whole automobile are increased.
For a traditional fuel vehicle, the low-voltage storage battery can be supplied with power only by starting the engine, the starting of the engine is sensible, and meanwhile, the problems of noise, harmful gas emission and the like can be caused, so that the use requirement of automatic power supply is not met. In recent years, electric automobiles which are developed more and more quickly have no external appearance and no harmful gas is generated when the electric automobiles are electrified at high voltage, so that the electric automobiles have basic conditions for automatic power supplement.
In the prior art, the implementation modes of automatic power supply are different:
1. whether the low-voltage storage battery is insufficient or not is judged by detecting the voltage of the storage battery, the purpose of identifying the insufficient voltage can be achieved, but the accuracy is poor;
2. the safety state of the vehicle during automatic power supply is ensured through the state of the engine compartment cover, the purpose of judging that the vehicle is in the safety state can be achieved, and the departure intention of a vehicle owner can not be reflected better than the fortification state.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an automatic power-on control method for a low-voltage storage battery of an electric vehicle.
The purpose of the invention is realized by the following technical scheme:
an automatic power supply control method for a low-voltage storage battery of an electric automobile comprises the following steps:
detecting the SOC value of a low-voltage storage battery and judging whether the power is insufficient;
step two, when the low-voltage storage battery is in power shortage and the vehicle is in a defense state, sending a power supplementing request to the VCU;
step three, the VCU judges whether a power supplement condition is met, and when the power supplement condition is met, high-voltage electrification starts to supplement power for the low-voltage storage battery;
and step four, after the power supply is started, the GW detects the SOC value of the low-voltage storage battery, the power supply timing is started, whether the condition of stopping the power supply is met or not is judged in real time in the power supply process, when the condition of stopping the power supply is met, the GW stops sending the power supply request, and the power supply is finished.
Further, the first step specifically comprises: and when the CAN network is in sleep, the EEM is self-awakened every 5 hours, and the SOC value of the low-voltage storage battery EBS is read.
Further, the second step is specifically: and when the EEM reads that the SOC of the low-voltage storage battery is less than 65 percent and meets the condition that the vehicle is in a fortifying state, waking up the CAN network and sending a power supplementing request to the VCU.
Further, the third step is specifically: after receiving the power supplement request, the VCU judges whether the following conditions are met simultaneously:
firstly, the SOC of the power battery is more than or equal to 10 percent;
the charging gun is not connected;
high voltage power-on failure without prohibition
When the conditions are met, the high voltage is electrified to supplement the electricity for the low-voltage storage battery, and the electricity supplementing state at the moment is fed back to the EEM to be in electricity supplementing.
Further, the fourth step is specifically: after receiving a signal that the power supplementing state is in power supplementing, GW starts to detect the SOC value of the low-voltage storage battery and starts power supplementing timing;
when any one of the following conditions is met, the GW stops sending the power supplementing request:
firstly, the SOC of the storage battery is more than 90 percent;
secondly, the timing is over 1 hour, and the SOC of the storage battery is less than or equal to 90 percent;
and the GW accords with any power supply interruption condition.
Still further, the power supply interruption condition includes:
A. the vehicle is in an unprotected state;
B. the power supply mode is not IGOFF;
C. the nacelle cover is not in a closed state;
d, the GW receives a signal that the power supply state is power supply failure.
Furthermore, in the high-voltage power-on process or the power supplement process, when any one of the following conditions is met, the VCU actively reduces the voltage at the high voltage, and feeds back a signal that the power supplement state is power supplement failure:
a. in the electricity supplementing process, the SOC of the power battery is less than 5 percent;
b. the whole vehicle has a fault causing high voltage reduction;
after DCDC is enabled, the DCDC does not work;
d. the power supplementing request sent by the GW is not received after a certain time;
e. receiving a charging wake-up signal;
f. the vehicle is in an un-fortifying state;
g. the power supply mode is not IGOFF;
h. the nacelle cover is in an open state.
The invention has the following beneficial effects:
1) whether the low-voltage storage battery is insufficient or not is judged by detecting the SOC of the low-voltage storage battery, and the judgment is more accurate than the judgment in a voltage detection mode.
2) The safety state of the vehicle during automatic power supply is ensured by judging the fortification state, and the vehicle cannot cause harm to people.
3) The VCU judges the high-voltage related faults, the charging gun state, the DCDC state and the like, and ensures the safety of high-voltage electrification.
Drawings
FIG. 1 is a schematic block diagram of an automatic power-on control method for a low-voltage storage battery of an electric vehicle according to the invention;
fig. 2 is a flow chart of an electric vehicle low-voltage battery automatic power-up control method according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
an automatic power supply control method for a low-voltage storage battery of an electric automobile comprises the following steps:
detecting the SOC value of a low-voltage storage battery and judging whether the power is insufficient;
step two, when the low-voltage storage battery is in power shortage and the vehicle is in a defense state, sending a power supplementing request to the VCU;
step three, the VCU judges whether a power supplement condition is met, and when the power supplement condition is met, high-voltage electrification starts to supplement power for the low-voltage storage battery;
and step four, after the power supply is started, the GW detects the SOC value of the low-voltage storage battery, the power supply timing is started, whether the condition of stopping the power supply is met or not is judged in real time in the power supply process, when the condition of stopping the power supply is met, the GW stops sending the power supply request, and the power supply is finished.
Further, the first step specifically comprises: and when the CAN network is in sleep, the EEM is self-awakened every 5 hours, and the SOC value of the low-voltage storage battery EBS is read.
Further, the second step is specifically: and when the EEM reads that the SOC of the low-voltage storage battery is less than 65 percent and meets the condition that the vehicle is in a fortifying state, waking up the CAN network and sending a power supplementing request to the VCU.
Further, the third step is specifically: after receiving the power supplement request, the VCU judges whether the following conditions are met simultaneously:
firstly, the SOC of the power battery is more than or equal to 10 percent;
the charging gun is not connected;
high voltage power-on failure without prohibition
When the conditions are met, the high voltage is electrified to supplement the electricity for the low-voltage storage battery, and the electricity supplementing state at the moment is fed back to the EEM to be in electricity supplementing.
Further, the fourth step is specifically: after receiving a signal that the power supplementing state is in power supplementing, GW starts to detect the SOC value of the low-voltage storage battery and starts power supplementing timing;
when any one of the following conditions is met, the GW stops sending the power supplementing request:
firstly, the SOC of the storage battery is more than 90 percent;
secondly, the timing is over 1 hour, and the SOC of the storage battery is less than or equal to 90 percent;
and the GW accords with any power supply interruption condition.
Still further, the power supply interruption condition includes:
A. the vehicle is in an unprotected state;
B. the power supply mode is not IGOFF;
C. the nacelle cover is not in a closed state;
d, the GW receives a signal that the power supply state is power supply failure.
Furthermore, in the high-voltage power-on process or the power supplement process, when any one of the following conditions is met, the VCU actively reduces the voltage at the high voltage, and feeds back a signal that the power supplement state is power supplement failure:
a. in the electricity supplementing process, the SOC of the power battery is less than 5 percent;
b. the whole vehicle has a fault causing high voltage reduction;
after DCDC is enabled, the DCDC does not work;
d. the power supplementing request sent by the GW is not received after a certain time;
e. receiving a charging wake-up signal;
f. the vehicle is in an un-fortifying state;
g. the power supply mode is not IGOFF;
h. the nacelle cover is in an open state.
Examples
As shown in fig. 1, the principle of an automatic recharging control method for a low-voltage storage battery of an electric vehicle is as follows:
the EEM (power supply management module) is responsible for judging the low-voltage storage battery power-lack condition, and if the current state is in the power-lack state and the vehicle meets the condition, the EEM sends a power supplement request signal to a VCU (vehicle control unit). And after receiving the power supplement request signal, the VCU carries out high-voltage power-on and then feeds back the power supplement result to the EEM.
As shown in fig. 2, the embodiment is an automatic power supply control method for a low-voltage battery of an electric vehicle, which includes the following specific steps:
1) and when the CAN network is in sleep, the EEM is self-awakened every 5 hours, and the SOC value of the low-voltage storage battery EBS is read.
2) And when the EEM reads that the SOC of the low-voltage storage battery is less than 65 percent and meets the condition that the vehicle is in a fortifying state, waking up the CAN network and sending a power supplementing request to the VCU.
3) After receiving the power supplement request, the VCU judges whether the following conditions are met simultaneously:
firstly, the SOC of the power battery is more than or equal to 10 percent;
the charging gun is not connected;
no forbidden high-voltage power-on fault exists;
when the conditions are met, the high voltage is electrified to supplement the electricity for the low-voltage storage battery, and meanwhile, an electricity supplementing state signal is fed back to the EEM, namely an electricity supplementing middle signal.
4) After receiving the ' power supply state signal ' which is in power supply ', the GW (gateway) starts to detect the SOC value of the low-voltage storage battery and starts power supply timing;
when any one of the following conditions is met, the GW stops sending the power supplementing request;
firstly, the SOC of the storage battery is more than 90 percent;
secondly, the timing is over 1 hour, and the SOC of the storage battery is less than or equal to 90 percent;
and thirdly, the GW receives any one of the following power supply interruption conditions:
A. the vehicle is in an unprotected state;
B. the power supply mode is not IGOFF;
C. the nacelle cover is not in a closed state;
d, the GW receives a signal that the power supply state is power supply failure.
5) When any one of the following conditions is met in the high-voltage power-on process/power-supplementing process, the VCU actively reduces the voltage under the high voltage and feeds back a power-supplementing state signal as failure.
Firstly, in the electricity supplementing process, the SOC of the power battery is less than 5 percent;
secondly, the whole vehicle has a fault causing high voltage reduction;
after the DCDC is enabled, the DCDC does not work;
fourthly, the power supplementing request sent by the GW is not received for more than a certain time (1 s);
receiving a charging wake-up signal;
sixthly, the vehicle is in a non-fortifying state;
the power supply mode is not IGOFF;
the cabin cover is in an open state.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An automatic power supply control method for a low-voltage storage battery of an electric automobile is characterized by comprising the following steps:
detecting the SOC value of a low-voltage storage battery and judging whether the power is insufficient;
step two, when the low-voltage storage battery is in power shortage and the vehicle is in a defense state, sending a power supplementing request to the VCU;
step three, the VCU judges whether a power supplement condition is met, and when the power supplement condition is met, high-voltage electrification starts to supplement power for the low-voltage storage battery;
and step four, after the power supply is started, the GW detects the SOC value of the low-voltage storage battery, the power supply timing is started, whether the condition of stopping the power supply is met or not is judged in real time in the power supply process, when the condition of stopping the power supply is met, the GW stops sending the power supply request, and the power supply is finished.
2. The automatic power-on control method for the low-voltage storage battery of the electric automobile according to claim 1, characterized in that the first step is specifically as follows: and when the CAN network is in sleep, the EEM is self-awakened every 5 hours, and the SOC value of the low-voltage storage battery EBS is read.
3. The automatic power-on control method for the low-voltage storage battery of the electric automobile according to claim 1, wherein the second step is specifically as follows: and when the EEM reads that the SOC of the low-voltage storage battery is less than 65 percent and meets the condition that the vehicle is in a fortifying state, waking up the CAN network and sending a power supplementing request to the VCU.
4. The automatic power-on control method for the low-voltage storage battery of the electric automobile according to claim 1, wherein the third step is specifically as follows: after receiving the power supplement request, the VCU judges whether the following conditions are met simultaneously:
firstly, the SOC of the power battery is more than or equal to 10 percent;
the charging gun is not connected;
no forbidden high-voltage power-on fault exists;
when the conditions are met, the high voltage is electrified to supplement the electricity for the low-voltage storage battery, and the electricity supplementing state at the moment is fed back to the EEM to be in electricity supplementing.
5. The automatic power-on control method for the low-voltage storage battery of the electric automobile according to claim 1, wherein the fourth step is specifically as follows:
after receiving a signal that the power supplementing state is in power supplementing, GW starts to detect the SOC value of the low-voltage storage battery and starts power supplementing timing;
when any one of the following conditions is met, the GW stops sending the power supplementing request:
firstly, the SOC of the storage battery is more than 90 percent;
secondly, the timing is over 1 hour, and the SOC of the storage battery is less than or equal to 90 percent;
and the GW accords with any power supply interruption condition.
6. The automatic power supply control method for the low-voltage storage battery of the electric vehicle as claimed in claim 5, wherein the power supply interruption condition comprises:
A. the vehicle is in an unprotected state;
B. the power supply mode is not IGOFF;
C. the nacelle cover is not in a closed state;
d, the GW receives a signal that the power supply state is power supply failure.
7. The automatic power-on control method for the low-voltage storage battery of the electric automobile according to claim 6, characterized in that in the high-voltage power-on process or the power-on process, when any one of the following conditions is met, the VCU actively reduces the voltage under the high voltage and feeds back a signal that the power-on state is power-on failure:
a. in the electricity supplementing process, the SOC of the power battery is less than 5 percent;
b. the whole vehicle has a fault causing high voltage reduction;
after DCDC is enabled, the DCDC does not work;
d. the power supplementing request sent by the GW is not received after a certain time;
e. receiving a charging wake-up signal;
f. the vehicle is in an un-fortifying state;
g. the power supply mode is not IGOFF;
h. the nacelle cover is in an open state.
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| JP2018143074A (en) * | 2017-02-28 | 2018-09-13 | 株式会社デンソー | Control device and control system comprising the control device |
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