CN112060911B - Low-voltage power supply abnormal driving control method, device and medium for new energy automobile - Google Patents

Low-voltage power supply abnormal driving control method, device and medium for new energy automobile Download PDF

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Publication number
CN112060911B
CN112060911B CN202010928374.5A CN202010928374A CN112060911B CN 112060911 B CN112060911 B CN 112060911B CN 202010928374 A CN202010928374 A CN 202010928374A CN 112060911 B CN112060911 B CN 112060911B
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voltage
vcu
low
power supply
vehicle speed
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CN112060911A (en
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彭红涛
杜佳
赵征澜
范超
骆顺志
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/003—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to inverters
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/08—Means for preventing excessive speed of the vehicle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

The invention discloses a method, a device and a medium for controlling abnormal driving of a low-voltage power supply of a new energy automobile, belonging to the technical field of automobile electronics, wherein the method comprises the following steps: if the VCU detects that the low-voltage power supply voltage meets the first target requirement, controlling the vehicle to enter a normal mode; if the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, the VCU controls the vehicle to enter an alarm mode, and the VCU controls and lights a storage battery lamp on the instrument to prompt that the low-voltage power supply has a problem; if the VCU detects that the low-voltage power supply voltage meets a third target requirement, controlling the vehicle to enter a power limiting mode so as to limit the power system before the steering power is limited; and if the VCU detects that the low-voltage power supply voltage meets the fourth target requirement, controlling the vehicle to enter a stop mode, and controlling the power system to limit the vehicle to be incapable of running by the VCU. The invention can avoid the safety problems caused by steering failure and power interruption during driving due to the abnormality of low-voltage power supply feed or over-high voltage and the like.

Description

Low-voltage power supply abnormal driving control method, device and medium for new energy automobile
Technical Field
The invention belongs to the technical field of automobile electronics, and particularly relates to a method, a device and a medium for controlling abnormal driving of a low-voltage power supply of a new energy automobile.
Background
The new energy automobile is generally provided with a high-voltage to low-voltage inverter DCDC (direct current to direct current) for converting high voltage into low voltage and charging a low-voltage storage battery, and when a DCDC system fails or a vehicle control unit VCU fails, the high voltage cannot be controlled to be converted into low voltage and the low-voltage storage battery cannot be charged, so that the low-voltage storage battery is fed; or the storage battery is overcharged due to DCDC abnormity, so that the storage battery is over-pressurized; no matter the low-voltage power supply voltage is too low or too high, all controllers of a low-voltage system cannot work normally, and particularly, systems such as a power steering system (ESC), an electric power steering (ESP) controller, a VCU controller and the like are involved, so that safety is seriously influenced. Steering suddenly fails due to battery feeding, which can lead to power interruption during driving. At present, the DCDC system fault is mainly reminded through instrument alarm, if only the instrument alarm is reminded, if the user continues to travel the vehicle, because the low voltage power supply voltage is too low or too high can lead to steering failure suddenly, can lead to power interruption when traveling, especially can have very big potential safety hazard when high speed.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method, a device and a medium for controlling abnormal driving of a low-voltage power supply of a new energy automobile, and power limitation is performed on the power of a power system when the low-voltage power supply is fed or the voltage is overhigh and the like, so that the driving safety is ensured.
In order to achieve the above object, according to an aspect of the present invention, there is provided a low-voltage power supply abnormal driving control method for a new energy automobile, including:
if the VCU detects that the voltage of the low-voltage power supply meets the first target requirement, the mode of the vehicle is controlled to be a normal mode, all controllers work normally, and alarming and power system limitation are not carried out;
if the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, controlling a vehicle to enter an alarm mode, and controlling a storage battery lamp on an instrument to be lightened by the VCU to prompt that the low-voltage power supply has a problem;
if the VCU detects that the low-voltage power supply voltage meets a third target requirement, controlling the vehicle to enter a power limiting mode so as to limit a power system on the premise of limiting the steering assistance;
and if the VCU detects that the low-voltage power supply voltage meets a fourth target requirement, controlling the vehicle to enter a stop mode, controlling the power system to limit the vehicle not to run by the VCU, and simultaneously lightening a system fault lamp by the VCU.
In some optional embodiments, the VCU detecting that the low voltage supply voltage meets the first target requirement includes:
the VCU detects that the low-voltage power supply voltage is within a first target range;
the VCU detecting that the low voltage supply voltage meets a second target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is lower than a lower limit value or higher than an upper limit value of the first target range, or a DCDC system failure, or the VCU and DCDC communication is lost.
In some optional embodiments, the VCU detecting that the low voltage supply voltage meets a third target requirement includes:
the VCU detects that the low-voltage power supply voltage is smaller than a first preset voltage value and lasts for a first preset time, or the VCU detects that the low-voltage power supply voltage is higher than a second preset voltage value and lasts for a second preset time.
In some optional embodiments, the VCU detecting that the low voltage supply voltage meets a fourth target requirement includes:
the VCU detects that the low-voltage power supply voltage is lower than a third preset voltage value and lasts for a third preset time, or the VCU detects that the low-voltage power supply voltage is higher than a fourth preset voltage value and lasts for a fourth preset time.
In some optional embodiments, after the vehicle enters the power-limited mode, if the vehicle speed is higher than a preset vehicle speed threshold, the VCU limits the power of the power system so that the vehicle speed is not higher than the preset vehicle speed threshold, when the vehicle speed is lower than the preset vehicle speed threshold, the VCU does not limit the power of the power system, and accelerates so that the vehicle speed does not exceed the preset vehicle speed threshold, the VCU controls the power system so that the vehicle speed is not higher than the preset vehicle speed threshold all the time, and the VCU lights a system fault lamp and/or a turtle lamp at the same time.
In some optional embodiments, in the normal mode, the output power is equal to the requested power under the current operating conditions.
In some optional embodiments, in the limited power mode, the output power is a product of the requested power under the current operating condition and a limit factor according to the vehicle speed under the current operating condition.
In some alternative embodiments, in the stop mode, the VCU controls the powertrain torque to 0Nm, slowly decreases the vehicle speed to 0km/h if the vehicle speed is greater than 0km/h, and stops the vehicle if the vehicle speed is 0 km/h.
According to another aspect of the present invention, there is provided a low-voltage power supply abnormal driving control apparatus for a new energy automobile, including:
the first processing unit is used for controlling the mode of the vehicle to be a normal mode when the VCU detects that the voltage of the low-voltage power supply meets a first target requirement, and all controllers work normally without alarming and power system limitation;
the second processing unit is used for controlling the vehicle to enter an alarm mode when the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, and the VCU controls and lights a storage battery lamp on an instrument to prompt that the low-voltage power supply has a problem;
the third processing unit is used for controlling the vehicle to enter a power limiting mode to carry out power system limitation before the limitation of the steering power assistance when the VCU detects that the low-voltage power supply voltage meets a third target requirement;
and the fourth processing unit is used for controlling the vehicle to enter a stop mode when the VCU detects that the low-voltage power supply voltage meets a fourth target requirement, and controlling the power system to limit the vehicle not to run by the VCU and simultaneously lightening a system fault lamp through the VCU.
According to another aspect of the invention, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any of the above.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
according to the invention, by monitoring the low-voltage power supply system, when the DCDC system fails or can not normally control high voltage to convert low voltage, and the power supply of the low-voltage power supply is abnormal, corresponding processing strategies are respectively made on the power system according to the low-voltage power supply voltage classification, so that the problems of power interruption and the like caused by sudden failure of steering due to abnormal behaviors such as storage battery feeding or over-high voltage and the like are avoided, and the power of the power system is limited when the low-voltage power supply battery feeding or over-high voltage and the like are abnormal, so that the driving safety is ensured.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling abnormal driving of a low-voltage power supply of a new energy vehicle according to an embodiment of the invention;
FIG. 2 is a system architecture diagram according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another method for controlling abnormal driving of a low-voltage power supply of a new energy vehicle according to an embodiment of the invention;
fig. 4 is a power coefficient diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present examples, "first", "second", etc. are used for distinguishing different objects, and are not necessarily used for describing a particular order or sequence.
The terms of the present invention are explained as follows:
VCU: the vehicle control unit controls a motor for a pure electric vehicle, and controls an engine, a driving motor, a generator and the like for a hybrid electric vehicle;
EMS: the engine management system receives a VCU control command to control the engine;
MCU: the motor controller receives a VCU control instruction to control the motor;
GCU: the generator controller receives a VCU control instruction to control the generator;
BMS: a battery management system for managing the high-voltage battery system;
DCDC: the high-voltage to low-voltage inverter converts high voltage into low voltage to charge the low-voltage storage battery;
EPS: an electric power steering controller that controls a steering system;
ESC: an electronic stability system;
IC: instrument information display, information prompt, alarm prompt and the like;
CAN: a controller area network.
Example one
Fig. 1 is a schematic flow chart of a method for controlling abnormal driving of a low-voltage power supply of a new energy vehicle according to an embodiment of the present invention, where the method shown in fig. 1 includes the following steps:
s101: if the VCU detects that the voltage of the low-voltage power supply meets the first target requirement, the mode of the vehicle is controlled to be a normal mode, all controllers work normally, and alarming and power system limitation are not carried out;
s102: if the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, the vehicle is controlled to enter an alarm mode, and the VCU controls to light a storage battery lamp on the instrument to prompt that the low-voltage power supply has a problem;
in some alternative embodiments, the VCU detecting that the low voltage supply voltage meets the first target requirement includes:
the VCU detects that the voltage of the low-voltage power supply is in a first target range, namely the range from V3 to V4;
the VCU detects that the low-voltage supply voltage meets a second target requirement, including:
the VCU detects that the low-voltage supply voltage is below the lower limit value V3 or above the upper limit value V4 of the first target range, or that the DCDC system fails, or that the VCU loses communication with the DCDC.
S103: if the VCU detects that the low-voltage power supply voltage meets a third target requirement, controlling the vehicle to enter a power limiting mode so as to limit the power system before the steering power is limited;
in some alternative embodiments, the VCU detects that the low voltage supply voltage meets a third target requirement, including:
the VCU detects that the low-voltage power voltage is less than a first preset voltage value V2 for a first preset time, or the VCU detects that the low-voltage power voltage is higher than a second preset voltage value V5 for a second preset time.
In some optional embodiments, after the vehicle enters the power-limited mode, if the vehicle speed is higher than the preset vehicle speed threshold, the VCU limits the power of the power system so that the vehicle speed is not higher than the preset vehicle speed threshold, and when the vehicle speed is lower than the preset vehicle speed threshold, the VCU does not limit the power of the power system and accelerates so that the vehicle speed does not exceed the preset vehicle speed threshold, the VCU controls the power system so that the vehicle speed is not higher than the preset vehicle speed threshold all the time, and the VCU lights the system fault lamp and/or the turtle lamp.
In the embodiment of the invention, the preset vehicle speed threshold value can be calibrated according to tests.
S104: and if the VCU detects that the low-voltage power supply voltage meets the fourth target requirement, controlling the vehicle to enter a stop mode, controlling the power system to limit the vehicle not to run by the VCU, and simultaneously lightening a system fault lamp through the VCU.
In some alternative embodiments, in the limited power mode, the output power is the product of the requested power at the current operating condition and a limit factor according to the vehicle speed at the current operating condition.
In some optional embodiments, the VCU detecting that the low voltage supply voltage meets a fourth target requirement comprises:
the VCU detects that the low-voltage power voltage is lower than the third preset voltage value V1 for a third preset time, or the VCU detects that the low-voltage power voltage is higher than the fourth preset voltage value V6 for a fourth preset time.
In some alternative embodiments, in the stop mode, the VCU controls the powertrain torque to 0Nm, slowly decreasing the vehicle speed to 0km/h if the vehicle speed is greater than 0km/h, and stopping the vehicle if the vehicle speed is 0 km/h.
In the embodiment of the invention, the values of V1, V2, V3, V4, V5 and V6 can be calibrated according to experiments.
In the embodiment of the present invention, the first preset time, the second preset time, the third preset time and the fourth preset time may be calibrated according to a test.
Example two
The related system architecture diagram of the invention is shown in fig. 2, wherein DCDC is on one CAN, EPS, ESC and instruments are on the other CAN, and VCU is used as gateway to connect two CAN.
In the embodiment of the invention, the VCU controls the working voltage of the DCDC to be 14V, if the VCU and the DCDC are normal, the DCDC is controlled in the control precision range, and the output voltage of the DCDC received by the VCU is 14V; if abnormal, it may cause the DCDC output voltage to be higher than 14 volts, resulting in too high a low voltage supply voltage, or too low a DCDC output voltage or even a DCDC failure, resulting in a low voltage supply feed.
In the embodiment of the invention, the normal working voltage of the whole system controller is 9-16V; the EPS is above 17V without power assistance, the power assistance is reduced to 0% in the range from 9V to 10V; ESC is above 17V, the function is abnormal, below 9V, the electron stable function can't work normally; BMS is power limited at 16V to 18V.
According to the above-mentioned operating voltage characteristics of the entire system controller, the technical solution of the embodiment of the present invention achieves the following objectives:
1) when the voltage of the DCDC power supply system is too low or too high or fails, reminding a user that the low-voltage power supply is abnormal, and carrying out maintenance and careful driving as soon as possible;
2) before the power-assisted steering limit, the power of a power system is limited in advance, so that the speed of the vehicle is reduced to a controllable range, and the safety problem caused by the power-assisted steering limit when the vehicle runs at a high speed is avoided;
3) stopping the vehicle before the steering power-assisted and electronic stabilizing system fails; the safety problem caused by the failure of the steering and electronic stabilizing system when the vehicle runs is avoided.
In the embodiment of the present invention, the control mode is divided into 4 operation modes according to the low voltage power supply voltage range, as shown in table 1 below:
TABLE 1
Figure BDA0002669286200000081
Fig. 3 is a schematic flow chart of another method for controlling abnormal driving of a low-voltage power supply of a new energy vehicle according to an embodiment of the present invention, where the method shown in fig. 3 includes the following steps:
(1) when the VCU detects that the voltage of the low-voltage power supply is in a range of V3-V4 (for example, 12V-15V, which can be calibrated), the mode of the vehicle is controlled to be a normal mode, all controllers work normally, and no alarm and power system limitation are carried out;
in the embodiment of the invention, in the normal mode, the power P is outputReq_FinalEqual to the requested power P under the current working conditionReq。
(2) When the VCU detects that the voltage of the low-voltage power supply is lower than V3 (for example, 12 volts, can be calibrated) or higher than V4 (for example, 15 volts, can be calibrated), or DCDC reports a system fault, or the VCU and the DCDC are lost in communication, the vehicle is controlled to enter an alarm mode, the VCU controls to lighten a storage battery lamp on an instrument to prompt that the low-voltage power supply has problems, and a user is reminded to pay attention to overhaul;
wherein, the recovery conditions of the alarm mode are as follows: the voltage is equal to or higher than V3 or equal to or lower than V4 and lasts for T1 (e.g., 5s, calibratable), or the fault disappears.
In the embodiment of the invention, in the alarm mode, the VCU lights the storage battery alarm lamp to remind a user of the fault of the storage battery system and pay attention to careful driving.
(3) When the VCU detects that the low-voltage power supply voltage is lower than V2 (e.g., 10.5 volts, calibratable) and continues for T1 (e.g., 5 seconds, calibratable) or higher than V5 (e.g., 16 volts, calibratable) and continues for T1 (e.g., 5 seconds, calibratable), controlling the vehicle to enter a limited power mode;
the VCU controls the power system to limit the vehicle to enable the vehicle speed to be not higher than X1 when the vehicle speed is higher than X1 (which can be calibrated), and can accelerate when the vehicle speed is lower than X1, but the vehicle speed cannot exceed X1 when an accelerator pedal is stepped on; meanwhile, a system fault lamp and a turtle lamp are lightened through the VCU.
The recovery condition of the limited power mode is as follows: the low voltage supply voltage is greater than or equal to V2 and remains above T2 (e.g., 500 milliseconds, calibratable), or the low voltage supply voltage is less than or equal to V5 and remains above T2 (e.g., 500 milliseconds, calibratable).
In the embodiment of the invention, in a power limiting mode, if the VCU detects that the current vehicle speed is higher than X1 (which can be calibrated), the VCU limits the power of the power system, so that the vehicle speed is smoothly reduced to X1, if the accelerator pedal is continuously stepped on, the vehicle is controlled to be not higher than X1 all the time, and if the accelerator pedal is reduced or the brake is stepped on, the vehicle is controlled to reduce the vehicle speed to be even 0 km/h; if the current vehicle speed is lower than X1 (can be calibrated), the VCU does not limit the power of the power system, the accelerator pedal is continuously increased, the vehicle is controlled to increase the vehicle speed until the vehicle speed reaches X1, the VCU controls the power system to keep the vehicle speed not higher than X1, if the accelerator pedal is reduced or the brake is stepped on, the vehicle speed can be reduced, and the vehicle speed can even be reduced to 0 km/h.
Wherein, in the power limiting mode, the output power PReq_FinalIs the requested power P under the current working conditionReqThe power coefficient map is shown in fig. 4, which is the product of the current operating condition and the vehicle speed limiting coefficient K:
PReq_Final＝PReq×K
(4) when the VCU detects that the low-voltage power supply voltage is lower than V1 (for example, 9.5 volts and can be calibrated) and lasts for T3 (for example, 1 second and can be calibrated) or higher than V6 (for example, 17 volts and can be calibrated) and lasts for T3 (for example, 1 second and can be calibrated), the vehicle is controlled to enter a stop mode, the VCU controls a power system to limit the vehicle not to run, and the VCU gives a torque command of 0Nm to an engine and a motor; meanwhile, a system fault lamp is lightened through the VCU;
the purpose of the stop mode is to stop the vehicle gradually before the steering assist and electronic stability system fails, thereby avoiding safety problems.
The recovery conditions of the stop mode are as follows: the low voltage supply voltage is greater than or equal to V1 and lasts for more than T2 (e.g., 500 milliseconds, calibratable) or the low voltage supply voltage is less than or equal to V6 and lasts for more than T2 (e.g., 500 milliseconds, calibratable).
In an embodiment of the invention, in the stop mode, the VCU controls the powertrain torque to 0Nm, slowly decreases the vehicle speed to 0km/h if the vehicle speed is greater than 0km/h, and stops the vehicle if the vehicle speed is 0 km/h.
EXAMPLE III
In a third embodiment of the present invention, there is also provided a device structure diagram, including:
the first processing unit is used for controlling the mode of the vehicle to be a normal mode when the VCU detects that the voltage of the low-voltage power supply meets a first target requirement, and all controllers work normally without alarming and power system limitation;
the second processing unit is used for controlling the vehicle to enter an alarm mode when the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, and the VCU controls and lights a storage battery lamp on the instrument to prompt that the low-voltage power supply has a problem;
the third processing unit is used for controlling the vehicle to enter a power limiting mode when the VCU detects that the low-voltage power supply voltage meets a third target requirement so as to limit the power system before the steering power assistance is limited;
and the fourth processing unit is used for controlling the vehicle to enter a stop mode when the VCU detects that the low-voltage power supply voltage meets a fourth target requirement, controlling the power system to limit the vehicle not to run by the VCU, and simultaneously lightening a system fault lamp through the VCU.
In the embodiments of the present invention, the specific implementation of each unit may refer to the description in the above method embodiments, and the embodiments of the present invention will not be repeated.
Example four
The application also provides a computer readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application mall, etc., on which a computer program is stored, and when the program is executed by a processor, the method for controlling abnormal driving of the low voltage power supply of the new energy vehicle in the method embodiment is implemented.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. A low-voltage power supply abnormal driving control method for a new energy automobile is characterized by comprising the following steps:
if the VCU detects that the voltage of the low-voltage power supply meets the first target requirement, the mode of the vehicle is controlled to be a normal mode, all controllers work normally, and alarming and power system limitation are not carried out;
if the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, controlling a vehicle to enter an alarm mode, and controlling a storage battery lamp on an instrument to be lightened by the VCU to prompt that the low-voltage power supply has a problem;
if the VCU detects that the low-voltage power supply voltage meets a third target requirement, controlling the vehicle to enter a power limiting mode so as to carry out power system limitation before the limitation of the steering power assistance, after the vehicle enters a power limiting mode, if the vehicle speed is higher than a preset vehicle speed threshold value, the VCU limits the power of the power system so as to ensure that the vehicle speed is not higher than the preset vehicle speed threshold value, when the vehicle speed is lower than the preset vehicle speed threshold value, the VCU does not limit the power of the power system and can adjust the vehicle speed through an accelerator pedal, so that the vehicle speed does not exceed the preset vehicle speed threshold value, the VCU controls the power system to ensure that the vehicle speed is not higher than the preset vehicle speed threshold all the time, and simultaneously, the VCU lights a system fault lamp and/or a turtle lamp, under the power limiting mode, the output power is the product of the requested power under the current working condition and the vehicle speed limiting coefficient under the current working condition;
if the VCU detects that the low-voltage power supply voltage meets a fourth target requirement, controlling the vehicle to enter a stop mode, controlling a power system to limit the vehicle not to run by the VCU, and simultaneously lightening a system fault lamp by the VCU;
the VCU detecting that a low voltage supply voltage meets a first target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is within a first target range;
the VCU detecting that the low voltage supply voltage meets a second target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is lower than the lower limit value of the first target range or higher than the upper limit value of the first target range, or a DCDC system fault, or the VCU and DCDC communication is lost;
the VCU detecting that the low voltage supply voltage meets a third target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is smaller than a first preset voltage value and lasts for a first preset time, or the VCU detects that the low-voltage power supply voltage is higher than a second preset voltage value and lasts for a second preset time;
the VCU detecting that the low-voltage supply voltage meets a fourth target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is lower than a third preset voltage value and lasts for a third preset time, or the VCU detects that the low-voltage power supply voltage is higher than a fourth preset voltage value and lasts for a fourth preset time.
2. The method of claim 1, wherein in the normal mode, the output power is equal to the requested power at the current operating condition.
3. A method according to claim 1 or 2, characterized in that in the stop mode the VCU controls the power system torque to 0Nm, if the vehicle speed is greater than 0km/h the vehicle speed is slowly reduced to 0km/h, if the vehicle speed is 0km/h the vehicle is stationary.
4. The utility model provides a new energy automobile low voltage power supply abnormal drive controlling means which characterized in that includes:
the first processing unit is used for controlling the mode of the vehicle to be a normal mode when the VCU detects that the voltage of the low-voltage power supply meets a first target requirement, and all controllers work normally without alarming and power system limitation;
the second processing unit is used for controlling the vehicle to enter an alarm mode when the VCU detects that the voltage of the low-voltage power supply meets a second target requirement, and the VCU controls and lights a storage battery lamp on an instrument to prompt that the low-voltage power supply has a problem;
a third processing unit for, when the VCU detects that the low-voltage supply voltage meets a third target requirement, controlling the vehicle to enter a power limiting mode to perform power system limitation before the steering power assistance is limited, after the vehicle enters a power limiting mode, if the vehicle speed is higher than a preset vehicle speed threshold value, the VCU limits the power of the power system so as to ensure that the vehicle speed is not higher than the preset vehicle speed threshold value, when the vehicle speed is lower than the preset vehicle speed threshold value, the VCU does not limit the power of the power system and can adjust the vehicle speed through an accelerator pedal, so that the vehicle speed does not exceed the preset vehicle speed threshold value, the VCU controls the power system to ensure that the vehicle speed is not higher than the preset vehicle speed threshold all the time, and simultaneously, the VCU lights a system fault lamp and/or a turtle lamp, in the power limiting mode, the output power is the product of the requested power under the current working condition and a vehicle speed limiting coefficient under the current working condition;
the fourth processing unit is used for controlling the vehicle to enter a stop mode when the VCU detects that the low-voltage power supply voltage meets a fourth target requirement, and the VCU controls the power system to limit the vehicle not to run and simultaneously lights a system fault lamp through the VCU;
the VCU detecting that a low voltage supply voltage meets a first target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is within a first target range;
the VCU detecting that the low voltage supply voltage meets a second target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is lower than the lower limit value of the first target range or higher than the upper limit value of the first target range, or a DCDC system fault, or the VCU and DCDC communication is lost;
the VCU detecting that the low voltage supply voltage meets a third target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is smaller than a first preset voltage value and lasts for a first preset time, or the VCU detects that the low-voltage power supply voltage is higher than a second preset voltage value and lasts for a second preset time;
the VCU detecting that the low-voltage supply voltage meets a fourth target requirement, comprising:
the VCU detects that the low-voltage power supply voltage is lower than a third preset voltage value and lasts for a third preset time, or the VCU detects that the low-voltage power supply voltage is higher than a fourth preset voltage value and lasts for a fourth preset time.
5. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 3.
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