CN114475250A

CN114475250A - Electronic control unit charging fault processing method of electric automobile and electronic control unit

Info

Publication number: CN114475250A
Application number: CN202011256438.8A
Authority: CN
Inventors: 陈锐; 刘洪太; 林鸿志; 李庆豪; 高兴龙
Original assignee: Vimar Automotive Wenzhou Co ltd; WM Smart Mobility Shanghai Co Ltd
Current assignee: Vimar Automotive Wenzhou Co ltd; WM Smart Mobility Shanghai Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2022-05-13

Abstract

The invention discloses a charging fault processing method of an electronic control unit of an electric automobile and the electronic control unit, wherein the method comprises the following steps: stopping charging in response to the charging fault, and determining whether the charging fault is a recoverable fault; if the charging fault is a recoverable fault, sending sleep information to other electronic control units of the electric automobile except the electronic control unit, entering a pseudo sleep state, enabling the other electronic control units to enter the sleep state after receiving the sleep information, enabling the electronic control unit not to enter the sleep state in the pseudo sleep state, detecting whether the charging fault is recovered, and if the charging fault is detected to be recovered, awakening the other electronic control units and recovering the charging. When the vehicle charging has a restorable charging fault, the electronic controller serving as the fault recovery detection controller does not sleep, and other ECUs of the vehicle enter the sleep, so that the static current of the whole vehicle is small, the power feed of a small battery can not be caused, and the vehicle can be recovered to continue charging after the charging fault source is recovered.

Description

Electronic control unit charging fault processing method of electric automobile and electronic control unit

Technical Field

The invention relates to the related technical field of electric automobiles, in particular to a charging fault processing method for an electronic control unit of an electric automobile and electronic equipment.

Background

New energy automobiles are more and more on the market. New energy automobile or electric automobile, it is more urgent to high continuation of the journey, quick charge demand. Therefore, the direct current charging scenes are more extensive, and particularly, the high-energy-ratio battery pack quick charging technology is more urgent. However, the dc charging technology is not perfect, and failures of dc charging failure are not rare, but many failures can be recovered after a period of time, for example: too high grid voltage, too low grid voltage, over-temperature of the charging equipment (especially in outdoor high-temperature environments), etc.

Generally, a dc charging System is mainly controlled by a Battery Management System (BMS). In the design of an Electronic Control Unit (ECU) of a vehicle, a network management standard of an automobile Open System Architecture (Automotive Open System Architecture) is generally followed, and the requirement of network management is to wake up the vehicle with sleep.

As shown in fig. 1, an existing fault handling process includes:

step S101, a fault occurs in charging;

step S102, the BMS battery management system enters a sleep process;

step S103, the BMS battery management system stops sending network messages to the vehicles;

and step S104, the whole vehicle enters the dormancy, and all ECUs in the whole vehicle are in the dormancy.

Therefore, when charging faults occur, the ECU of the BMS enters a dormant state, the network management messages are stopped being sent, then all the ECUs of the whole vehicle enter the dormant state, and the whole vehicle enters the dormant state, so that the small battery cell feeding caused by overlarge quiescent current is prevented. However, when the design method is applied to the charging system, when a fault occurs during the charging process, the charging is immediately stopped, and the entire vehicle enters a sleep state, the BMS cannot continuously detect whether the fault source is recovered, and cannot wake up the entire vehicle to recover the charging after the fault source is recovered.

Therefore, various problems may occur in the existing charging process of the new energy automobile, which results in charging failure, and charging cannot be continued after the charging failure is recovered.

Disclosure of Invention

Accordingly, it is necessary to provide a method for processing a charging failure of an electronic control unit of an electric vehicle and an electronic device, which solve the technical problem that the charging of the electric vehicle cannot be recovered after the charging failure occurs in the prior art.

The invention provides a method for processing charging faults of an electronic control unit of an electric automobile, which comprises the following steps:

stopping charging in response to a charging fault, and determining whether the charging fault is a recoverable fault;

if the charging fault is a recoverable fault, sending sleep information to other electronic control units of the electric automobile except the electronic control unit, entering a pseudo sleep state, enabling the other electronic control units to enter the sleep state after receiving the sleep information, enabling the electronic control unit not to enter the sleep state in the pseudo sleep state, detecting whether the charging fault is recovered, if the charging fault is detected to be recovered, awakening the other electronic control units, and recovering the charging.

When the vehicle charging has a restorable charging fault, the electronic controller serving as the fault recovery detection controller does not sleep, and other ECUs of the vehicle enter the sleep, so that the static current of the whole vehicle is small, the power feed of a small battery can not be caused, and the vehicle can be recovered to continue charging after the charging fault source is recovered.

Further, in the pseudo sleep state, the electronic control unit does not enter the sleep mode, and specifically includes:

and in the pseudo-dormant state, the electronic control unit stops sending network messages, and does not enter dormancy.

In the embodiment, in the pseudo sleep state, the electronic controller serving as the fault recovery detection controller is controlled to stop network message transmission, so that the quiescent current of the whole vehicle is further reduced.

Further, the detecting whether the charging fault is recovered or not, if the charging fault is recovered, waking up other electronic control units, and recovering the charging specifically includes:

detecting whether the charging fault is recovered within a preset timeout period;

if the charging fault is detected to be recovered within the overtime time, other electronic control units are awakened, and charging is recovered;

and if the charging fault recovery is not detected within the timeout time, the electronic control unit enters the sleep mode.

The embodiment sets the timeout time to avoid the continuous work of the electronic controller serving as the fault recovery detection controller, so as to reduce the quiescent current of the whole vehicle to the minimum state.

Further, the timeout time is determined according to the battery capacity of the electric vehicle and the quiescent current of the electronic control unit.

The overtime time of the embodiment is determined according to the battery capacity of the electric automobile and the quiescent current of the electronic control unit, so that the excessive influence on the electric quantity of the battery of the whole automobile is avoided.

Still further, the timeout time is: (battery capacity of battery car x value of preset allowable loss percentage)/quiescent current of the present electronic control unit.

The embodiment allows the loss percentage to be set, so that the battery capacity of the whole vehicle is not basically influenced.

Further, the recoverable fault comprises: the system comprises a charging base, a power grid voltage overhigh fault, a charging base temperature overhigh fault or a battery management system temperature overhigh fault.

The recoverable fault of the present embodiment is a fault having dynamic recoverability to continue charging after recovery of the fault.

Further, still include:

if the charging fault is an unrecoverable fault, the electronic control unit enters the sleep mode and sends sleep information to other electronic control units, and the other electronic control units enter the sleep mode after receiving the sleep information.

For the unrecoverable fault, all the electronic control units enter the sleep mode, and the quiescent current of the whole vehicle is reduced.

Still further, the unrecoverable fault includes: an equipment element damage fault, an electrical short fault, a relay adhesion fault, or an insulation detection anomaly fault.

The unrecoverable fault of the embodiment is a permanent fault, so that the electronic control unit of the whole vehicle enters the sleep mode after the fault occurs.

Still further, the electronic control unit is an electronic control unit of a battery management system.

In the embodiment, the electronic control unit of the battery management system enters the pseudo sleep mode when the fault can be recovered, so that the fault recovery can be conveniently detected.

The present invention provides an electronic control unit of an electric vehicle, the electronic control unit including:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to at least one of the processors; wherein the content of the first and second substances,

the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to perform the method for processing charging faults of an electronic control unit of an electric vehicle as described above.

Drawings

FIG. 1 is a flowchart of the operation of a prior art charge fault handling method;

FIG. 2 is a flowchart illustrating a method for handling a charging fault of an electronic control unit of an electric vehicle according to the present invention;

FIG. 3 is a flowchart illustrating a method for handling charging faults of an electronic control unit of an electric vehicle according to a preferred embodiment of the present invention;

fig. 4 is a schematic diagram of a hardware structure of an electronic control unit of an electric vehicle according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

Fig. 2 is a flowchart illustrating a method for processing a charging fault of an electronic control unit of an electric vehicle according to the present invention, which includes:

step S201, responding to a charging fault, stopping charging, and determining whether the charging fault is a recoverable fault;

step S202, if the charging fault is a recoverable fault, sending dormancy information to other electronic control units of the electric vehicle except the electronic control unit, and entering a pseudo dormancy state, wherein the other electronic control units enter dormancy after receiving the dormancy information, and in the pseudo dormancy state, the electronic control unit does not enter dormancy, detecting whether the charging fault is recovered, if detecting that the charging fault is recovered, awakening the other electronic control units, and recovering charging.

Specifically, the present embodiment can be applied to an Electronic Control Unit (ECU) of an automobile. In one embodiment, the method of the present embodiment is applied to an ECU of a BMS for an automobile. The present embodiment may be applied to an existing ECU of an automobile, for example, an ECU of a BMS or an ECU of a vehicle controller. In addition, it is also possible to have a single fail-over detection controller, i.e., to set up a single ECU to execute steps S101 to S102.

In vehicle charging, when a charging fault occurs, step S201 is triggered to check whether the charging fault is a recoverable fault.

When the recoverable charging failure occurs, step S202 is triggered, and the other ECUs of the vehicle enter the sleep except for the ECU that is the failure recovery detection controller not sleeping. That is, the electronic controller executing step S101 and step S102 does not go to sleep, and the other electronic controllers of the vehicle go to sleep.

Therefore, the static current of the whole vehicle can be ensured to be small, and the feed of a small storage battery cannot be caused.

And because this electronic controller does not sleep, can detect whether charging failure resumes, can resume charging after charging failure source resumes.

In one embodiment, in the pseudo sleep state, the electronic control unit does not enter into sleep, and specifically includes:

Specifically, when entering the pseudo sleep state, the ECU serving as the failure recovery detection controller stops network message transmission, and allows other ECUs in the vehicle to enter the sleep state, but the ECU does not sleep, and continues to detect whether the failure source is recovered.

In one embodiment, the detecting whether the charging fault is recovered, and if it is detected that the charging fault is recovered, waking up another electronic control unit and recovering charging specifically includes:

Specifically, the present embodiment sets the timeout time T. When the fault time exceeds the preset time T, the fault source is not recovered, and the ECU enters the dormancy state so as to reduce the quiescent current of the whole vehicle to the minimum state.

The embodiment sets the timeout time, and avoids the continuous work of an electronic controller serving as a fault recovery detection controller, so as to reduce the quiescent current of the whole vehicle to the minimum state.

In one embodiment, the timeout period is determined according to the battery capacity of the electric vehicle and the quiescent current of the electronic control unit.

Specifically, for setting the timeout T, the capacity Q of a small battery mounted on the entire vehicle and the quiescent current I of the ECU need to be considered. The quiescent current is a standby current of the ECU.

In one embodiment, the timeout time is: (battery capacity of battery car x value of preset allowable loss percentage)/quiescent current of the present electronic control unit.

Take BMS as an example. Generally speaking, when the standby current of the ECU of the BMS is 0.1A, assuming that the small battery capacity is 40AH, and 2% of the small battery capacity is taken as the standby current loss of the ECU of the BMS, T is 0.8AH/0.1A is 8H, that is, the fault recovery can still continue the charging strategy within 8 hours, and the BMS standby loss only accounts for 2% of the small battery capacity, and basically has no influence on the whole small battery.

In one embodiment, the recoverable fault comprises: the system comprises a charging base, a power grid voltage overhigh fault, a charging base temperature overhigh fault or a battery management system temperature overhigh fault.

Specifically, a fault may be recovered, with dynamic recovery, such as: the grid voltage is too high, the charging stand temperature is too high, the BMS temperature is too high, and the like.

In one embodiment, the method further comprises the following steps:

In one embodiment, the unrecoverable failure comprises: an equipment element damage fault, an electrical short fault, a relay adhesion fault, or an insulation detection anomaly fault.

Specifically, an unrecoverable failure is a permanent failure, such as: damage to equipment components, electrical shorts, relay adhesion, insulation detection anomalies, and the like.

In one embodiment, the electronic control unit is an electronic control unit of a battery management system.

As shown in fig. 3, a method for processing a charging fault of an electronic control unit of an electric vehicle according to a preferred embodiment of the present invention includes:

step S301, a fault occurs in the charging process;

step S302, judging whether the fault can be recovered, if so, executing step S303, otherwise, executing step S310;

step S303, the BMS battery management system enters a pseudo-sleep state;

step S304, the ECU of the BMS stops network message sending but does not sleep;

s305, the whole BMS enters a pseudo-sleep state, the ECU of the BMS can detect the fault source and recover, and only the ECU of the BMS in the whole BMS does not sleep;

step S306, judging whether the fault source is recovered within the specified time T, if so, executing step S307, otherwise, executing step S308;

step S307, the ECU of the BMS starts charging and ends the process;

step S308, the ECU of the BMS sleeps;

step S309, the whole vehicle enters the dormancy, the ECU of the BMS cannot detect the failure source and recover, all the ECUs in the whole vehicle are dormant, and the process is ended;

step S310, the BMS battery management system enters a sleep process;

step S311, the ECU of the BMS stops sending the network message and sleeps;

and step S312, the whole vehicle enters the dormancy state, the ECU of the BMS cannot detect the failure source and recover, and all the ECUs in the whole vehicle are dormant.

Specifically, as shown in table 1, the possible faults occurring during the charging process are classified into: recoverable faults, unrecoverable faults. The fault can be recovered, and the dynamic recovery performance is realized, such as: the grid voltage is too high, the charging stand temperature is too high, the BMS temperature is too high, and the like. Non-recoverable failures are permanent failures such as: damage to equipment components, electrical shorts, relay adhesion, insulation detection anomalies, and the like.

TABLE 1 charging Fault Classification

And after the fault occurs, judging whether the fault is a recoverable fault, and when the fault is an unrecoverable fault, enabling all ECUs of the whole vehicle to enter a sleep mode, wherein the ECU of the BMS cannot detect whether a fault source is recovered or not, and the fault source is the same as a sleep strategy after the AUTOSAR network manages the charging fault. When the fault is a recoverable fault, the charging is stopped, the BMS enters pseudo-dormancy, namely, a pseudo-dormancy state is added on the basis of AUTOSAR network management, the network message transmission is stopped, other ECUs on the vehicle enter dormancy, but the ECUs of the BMS do not sleep again, and whether the fault source is recovered or not is continuously detected. The ECU of the BMS in the pseudo-dormant state can keep AUTOSAR network management with other ECUs, can continue to detect whether the fault source is recovered, continues to charge after the fault source is recovered, and can ensure that the static current of the whole vehicle is small and the small battery does not feed power. In the BMS pseudo-sleep, a timeout time T is also set. And when the fault time exceeds the preset time T, the fault source is not recovered, and the ECU of the BMS enters the sleep state so as to reduce the static current of the whole vehicle to the minimum state.

For the setting of the timeout T, the capacity Q of the small battery carried by the entire vehicle and the quiescent current I of the ECU of the BMS need to be considered. Generally speaking, when the standby current of the ECU of the BMS is 0.1A, assuming a small battery capacity of 40AH, and when 2% of the small battery capacity is taken as the allowed BMS standby current loss, T is 0.8AH/0.1A is 8H, that is, when the fault recovery is set for 8 hours, the charging strategy can still be continued, and the BMS standby loss only accounts for 2% of the small battery capacity, and there is substantially no influence on the whole small battery.

In the embodiment, the pseudo sleep state is added in the BMS, whether the fault source is recovered or not can be continuously detected after the charging fault occurs, and the charging is continued after the fault source is recovered. During the pseudo-dormancy of BMS, the ECU of whole car BMS only does not sleep, and other ECUs are all dormant for whole car quiescent current is minimum, and sets up overtime, can not feed with the assurance small storage battery.

Fig. 4 is a schematic diagram of a hardware structure of an electronic control unit of an electric vehicle according to the present invention, where the electronic device includes:

at least one processor 401; and the number of the first and second groups,

a memory 402 communicatively coupled to at least one of the processors 401; wherein the content of the first and second substances,

the memory 402 stores instructions executable by the at least one processor 401, and the instructions are executed by the at least one processor 401, so that the at least one processor 401 can execute the method for processing the charging fault of the ecu of the electric vehicle.

Specifically, the Electronic Control Unit may be an Electronic Control Unit (ECU) of an automobile, such as an ECU of a BMS. In fig. 4, one processor 401 is taken as an example.

The processor 401 and the memory 402 may be connected by a bus or other means, such as a bus connection.

The memory 402, which is a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the method for processing charging fault of electronic control unit of electric vehicle in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 401 executes various functional applications and data processing by running the nonvolatile software programs, instructions and modules stored in the memory 402, that is, implements the method for processing the charging fault of the electronic control unit of the electric vehicle in the above-described embodiment.

The memory 402 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of an electronic control unit charging failure processing method of an electric vehicle, and the like. Further, the memory 402 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 402 may optionally include a memory remotely located from the processor 401, and these remote memories may be connected over a network to a device that performs the electronic control unit charging fault handling method for the electric vehicle. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

When the one or more modules are stored in the memory 402, and executed by the one or more processors 401, the method for processing charging fault of electronic control unit of electric vehicle in any of the above-described method embodiments is performed.

When the recoverable charging fault occurs in the charging of the vehicle, the electronic controllers serving as the fault recovery detection controllers are not dormant, and other ECU (electronic control units) of the vehicle enter the dormancy, so that the static current of the whole vehicle is small, the feed of a small storage battery cannot be caused, and the charging can be recovered to continue charging after the charging fault source is recovered.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A charging fault processing method for an electronic control unit of an electric automobile is characterized by comprising the following steps:

if the charging fault is a recoverable fault, sending dormancy information to other electronic control units of the electric vehicle except the electronic control unit, entering a pseudo dormancy state, enabling the other electronic control units to enter dormancy after receiving the dormancy information, enabling the electronic control unit not to enter dormancy in the pseudo dormancy state, detecting whether the charging fault is recovered, and if the charging fault is recovered, awakening the other electronic control units and recovering charging.

2. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 1, wherein in the pseudo sleep state, the electronic control unit does not enter into sleep, and specifically comprises:

3. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 1, wherein the detecting whether the charging fault is recovered or not, and if the charging fault is detected to be recovered, waking up other electronic control units and recovering charging specifically includes:

4. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 3, wherein the timeout period is determined according to a battery capacity of the electric vehicle and a quiescent current of the electronic control unit.

5. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 4, wherein the timeout period is: (battery capacity of battery car x value of preset allowable loss percentage)/quiescent current of the present electronic control unit.

6. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 1, wherein the recoverable fault comprises: the system comprises a charging base, a power grid voltage overhigh fault, a charging base temperature overhigh fault or a battery management system temperature overhigh fault.

7. The method for processing the charging fault of the electronic control unit of the electric vehicle according to claim 1, further comprising:

8. The electronic control unit charging fault handling method of an electric vehicle according to claim 7, wherein the unrecoverable fault includes: an equipment element damage fault, an electrical short fault, a relay adhesion fault, or an insulation detection anomaly fault.

9. The method for processing the charging fault of the electronic control unit of the electric vehicle according to any one of claims 1 to 8, wherein the electronic control unit is an electronic control unit of a battery management system.

10. An electronic control unit of an electric vehicle, characterized in that the electronic control unit comprises:

at least one processor; and the number of the first and second groups,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the electronic control unit charging fault handling method of an electric vehicle according to any one of claims 1 to 9.