CN111619355A - Electric automobile power-off control method in fault mode - Google Patents
Electric automobile power-off control method in fault mode Download PDFInfo
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- CN111619355A CN111619355A CN202010501474.XA CN202010501474A CN111619355A CN 111619355 A CN111619355 A CN 111619355A CN 202010501474 A CN202010501474 A CN 202010501474A CN 111619355 A CN111619355 A CN 111619355A
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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
- B60L3/04—Cutting off the power supply under fault conditions
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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
Abstract
The invention provides a power-off control method of an electric automobile in a fault mode, which comprises the following steps: s1, the vehicle controller receives the fault information with the fatal grade; s2, the vehicle control unit reads the environment information obtained by the environment sensing system; and S3, the vehicle control unit judges whether to power off immediately or delay power off according to the environmental information and the fault information. The invention can adopt an individualized fault processing strategy by combining the environmental information when each part has a fatal fault, thus not only selecting the power-off time with the minimum loss for power-off, but also further providing the reliability and the safety of the power-off process of the electric automobile, thereby further ensuring the personal safety of drivers and passengers.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a power-off control method of an electric automobile in a fault mode.
Background
At present, with the progress of society and the development of technology, the automobile holding capacity is increased in a blowout manner. The pure electric vehicle does not need fossil energy and does not pollute the environment, so the pure electric vehicle obtains general attention. With continuous innovation and breakthrough of the core technology of the pure electric vehicle and gradual improvement of infrastructure, the pure electric vehicle has a tendency of partially replacing the traditional fuel vehicle.
Compared with the traditional fuel automobile, the pure electric automobile has the following differences: the pure electric vehicle comprises a vehicle control unit, a power battery, a battery management system, a motor driving system, an inverter, a direct current-direct current converter, a transmission system and a vehicle-mounted instrument. The vehicle control unit has a function of power-on and power-off management of the high-low voltage equipment, and along with the development of the technology, the vehicle control unit also has a power-off management function in a fault mode.
The specification of Chinese invention patent CN 201610604820.0 discloses an electric control method for pure electric vehicles under the condition of vehicle failure, which comprises the following steps: after the whole vehicle is electrified at high voltage, detecting whether the vehicle has a fault; if the vehicle has a fault, further judging the grade of the fault (including a slight fault, a general fault, a serious fault and a very serious fault); and controlling the vehicle to enter a corresponding power-off mode according to the fault level. According to the vehicle fault power-off control method, a reasonable power-off processing mechanism can be adopted for faults of different levels so as to improve the reliability and safety of the power-off process.
The specification of the Chinese invention patent CN 201810531254.4 discloses a method for controlling the lower high voltage of an electric automobile, which comprises the following steps: collecting fault information of the whole vehicle, and judging whether the fault of the whole vehicle occurs or not; if the whole vehicle has a fault, prohibiting the motor controller from outputting the torque, and judging whether the rotating speed of the motor is less than a set rotating speed threshold value: and if the rotating speed is less than the set rotating speed threshold value, controlling the high pressure under the whole vehicle.
However, the prior art does not consider how to perform the power-off control to ensure personal safety in the case where the environment outside the vehicle is so complicated as to be unsuitable for immediate power-off.
Disclosure of Invention
In view of the above prior art, the technical problem to be solved by the present invention is to provide an electric vehicle power-off control method in a failure mode capable of combining environmental information.
In order to solve the technical problem, the invention provides an electric vehicle power-off control method in a fault mode, which comprises the following steps:
s1, the vehicle controller receives the fault information with the fatal grade;
s2, the vehicle control unit reads the environment information obtained by the environment sensing system;
and S3, the vehicle control unit judges whether to power off immediately or delay power off according to the environmental information and the fault information.
Preferably, the vehicle control unit in step S1 prestores therein fault information of different levels of each component, where the fatal fault information at least includes collision, overheating of the motor, abnormal disconnection of the power battery, excessive voltage of the battery cell, excessive temperature of the battery pack, excessively low SOC, and abnormal current display.
Preferably, the environmental information obtained by the environmental sensing system in step S2 at least includes vehicle speed, lane, pedestrian, obstacle, and weather.
Preferably, the vehicle control unit determines whether to power off immediately or to power off with delay according to the environmental information and the fault information in step S3, and specifically includes the following steps:
s31, calculating the power-off loss at different time points by the vehicle controller according to the environment information and the fault information;
and S32, the vehicle control unit compares the power-off loss at different time points with the power-off loss at different time points to judge whether to power off immediately.
Preferably, the method for determining whether to immediately power off in step S32 is: if the non-power-off loss at any time point is greater than the power-off loss, the vehicle control unit controls the related high-low voltage system to power off immediately; and if the initial power-off loss is larger than the power-off loss and the power-off loss is equal to the power-off loss at a certain future time point, the vehicle controller controls the related high-low voltage system to delay power-off.
Compared with the prior art, the invention has the beneficial effects that: the invention can adopt an individualized fault processing strategy by combining the environmental information when each part has a fatal fault, thus not only selecting the power-off time with the minimum loss for power-off, but also further providing the reliability and the safety of the power-off process of the electric automobile, thereby further ensuring the personal safety of drivers and passengers.
Drawings
Fig. 1 is a flowchart of an electric vehicle power-off control method in a fault mode according to the present invention.
Detailed Description
The invention will be further described with reference to the drawings and preferred embodiments.
The electric vehicle in the embodiment at least comprises a vehicle control unit, a power battery, a battery management system, an environment sensing system, a motor driving system and a vehicle-mounted instrument. The vehicle control unit, the power battery and battery management system, the environment sensing system, the motor driving system and the vehicle-mounted instrument CAN communicate through the CAN; meanwhile, the vehicle control unit, the power battery and battery management system, the environmental sensing system, the motor driving system and the vehicle-mounted instrument at least comprise various functions disclosed in the prior art, and thus, the detailed description is omitted here.
An electric control method in a failure mode based on an electric vehicle configured with the above-described structure, which includes the steps of:
and S1, the vehicle control unit receives the fault information with the grade being fatal, namely the vehicle control unit receives the fault information with the grade being fatal. It should be noted that, the vehicle control unit has pre-stored therein fault information of different levels of each component, where the faulty component may include a power battery, a battery management system, a motor driving system, etc., and the fault level is classified into a minor fault, a medium fault, a serious fault, and a fatal fault. Further, the fault information received by the vehicle control unit may include a charger fault, a DC/DC fault, an abnormal disconnection of the power battery, a non-disconnection of the power battery, an excessively high or low or unbalanced voltage of the battery cell, an excessively high or low or unbalanced temperature of the battery pack, an excessively low or unbalanced SOC, an abnormal current display, an air conditioner, a non-start of the vehicle, a non-start of the warm air, and the like, where the fatal fault information may include a collision, an overheating of the motor, an abnormal disconnection of the power battery, an excessively high voltage of the battery cell, an excessively high temperature of the battery pack, an excessively low SOC, an abnormal current display, and the like. It is further noted that the vehicle control unit may receive at least one fatal failure message.
And S2, the vehicle control unit reads the environmental information obtained by the environmental perception system. It should be noted that the environmental information obtained by the environmental sensing system at least includes the vehicle speed and the lane where the faulty vehicle is located, whether there are pedestrians and obstacles around the faulty vehicle, and the environmental information such as the weather condition.
And S3, the vehicle control unit judges whether to power off immediately or delay power off according to the environmental information and the fault information. The specific judgment process is as follows:
s31, calculating the power-off loss of the fault parts at different time points by the vehicle controller according to the environment information and the fault information;
and S32, comparing the power-off loss at different time points with the power-off loss of the parts prestored in the vehicle controller at different time points by the vehicle controller fault part, and judging whether to power off immediately. If the non-power-down loss at any time point is greater than the power-down loss, the vehicle controller controls the related high-low voltage system to power down immediately, namely, the vehicle is prohibited from running, the motor controller controls the motor to exit from a motor enabling mode, the direct current/direct current converter stops working, and the battery management system performs high-voltage power down; if the initial power-off loss is larger than the power-off loss and the power-off loss is equal to the power-off loss at a certain future time point, the vehicle controller controls the relevant high-low voltage system to power off in a delaying manner, namely, the vehicle controller keeps a normal driving state or reduces power to drive, and the vehicle is powered off after the vehicle is driven to an optimal safety point by using the delayed power-off time.
For a better understanding of the present invention, a specific example is provided below:
step 1, the vehicle control unit receives fatal fault information that the SOC of a power battery is lower than 5%;
step 2, the vehicle control unit reads that the speed of the fault vehicle is 60 kilometers per hour and is in a middle lane of the one-way 3 lanes; simultaneously reading vehicles with the speed of 100 kilometers per hour at the position 30 meters behind the same lane, and no other vehicles exist in the lane close to the roadside;
and 3, calculating the power-off loss of the power battery at different time points by the vehicle controller according to the fault information and the environment information, and obtaining that the probability of rear-end collision with a rear vehicle within 10 seconds of immediately powering off is more than 70%, and the power-off delay, namely the power battery is deeply discharged once to cause the capacity loss to be 0.1%, so that the power-off delay loss is far less than the power-off delay loss, the vehicle controller controls the relevant high-low voltage system to delay powering off, and the vehicle is powered off after the vehicle is moved to a safe roadside for parking by using the power-off delay time.
The foregoing merely represents preferred embodiments of the invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A power-off control method of an electric automobile in a fault mode is characterized by comprising the following steps:
s1, the vehicle controller receives the fault information with the fatal grade;
s2, the vehicle control unit reads the environment information obtained by the environment sensing system;
and S3, the vehicle control unit judges whether to power off immediately or delay power off according to the environmental information and the fault information.
2. The electric vehicle power-off control method under the fault mode according to claim 1, characterized in that: in the step S1, the vehicle control unit pre-stores therein fault information of each component at different levels, where the fatal fault information at least includes collision, overheating of the motor, abnormal disconnection of the power battery, excessive voltage of the battery cell, excessive temperature of the battery pack, excessively low SOC, and abnormal current display.
3. The electric vehicle power-off control method under the fault mode according to claim 1, characterized in that: the environmental information obtained by the environmental sensing system in step S2 at least includes vehicle speed, lane, pedestrian, obstacle, and weather.
4. The electric vehicle power-off control method under the fault mode according to claim 1, wherein the vehicle controller determines whether to power off immediately or to power off with delay in step S3 according to the environmental information and the fault information, and specifically comprises the following steps:
s31, calculating the power-off loss at different time points by the vehicle controller according to the environment information and the fault information;
and S32, the vehicle control unit compares the power-off loss at different time points with the power-off loss at different time points to judge whether to power off immediately.
5. The method for controlling power-off of an electric vehicle under a fault mode according to claim 4, wherein the step S32 for determining whether to power off immediately comprises: if the non-power-off loss at any time point is greater than the power-off loss, the vehicle control unit controls the related high-low voltage system to power off immediately; and if the initial power-off loss is larger than the power-off loss and the power-off loss is equal to the power-off loss at a certain future time point, the vehicle controller controls the related high-low voltage system to delay power-off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010501474.XA CN111619355A (en) | 2020-06-04 | 2020-06-04 | Electric automobile power-off control method in fault mode |
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| CN202010501474.XA CN111619355A (en) | 2020-06-04 | 2020-06-04 | Electric automobile power-off control method in fault mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361536A (en) * | 2022-03-18 | 2022-04-15 | 北汽福田汽车股份有限公司 | Fault processing method and device for fuel cell system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361536A (en) * | 2022-03-18 | 2022-04-15 | 北汽福田汽车股份有限公司 | Fault processing method and device for fuel cell system |
| CN114361536B (en) * | 2022-03-18 | 2022-06-14 | 北汽福田汽车股份有限公司 | Fault processing method and device for fuel cell system |
| WO2023173815A1 (en) * | 2022-03-18 | 2023-09-21 | 北汽福田汽车股份有限公司 | Fuel cell system fault processing method and apparatus |
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