阅读说明：本技术 一种诊断控制方法、装置及电动汽车 (Diagnosis control method and device and electric automobile ) 是由 代康伟 梁海强 余小菲 于 2019-08-07 设计创作，主要内容包括：本发明提供了一种诊断控制方法、装置及电动汽车,涉及汽车技术领域。该诊断控制方法包括：检测诊断仪插入到待诊断车辆触发的UDS信号；当检测到UDS信号时,检测诊断仪发送的维修指令；根据维修指令,控制高压继电器断开,并对车辆高压下电状态进行判断；当高压下电状态指示当前待诊断车辆已下高压,则向仪表控制器发送维修指示灯开启信号。通过检测诊断仪的插拔情况和维修指令来判断是否有维修请求,整车先断开高压,确保整车高压下电后再点亮维修指示灯,维修人员只有看到维修指示灯点亮后才允许开始维修操作,并且只有在退出维修模式后,维修指示灯熄灭,整车才被允许高压上电,使整车在被维修期间保持断开高压电,从而避免人身伤害。(The invention provides a diagnosis control method and device and an electric automobile, and relates to the technical field of automobiles. The diagnosis control method includes: detecting a UDS signal triggered by a vehicle to be diagnosed when a diagnostic instrument is inserted into the vehicle; when the UDS signal is detected, detecting a maintenance instruction sent by a diagnostic instrument; according to the maintenance instruction, the high-voltage relay is controlled to be switched off, and the high-voltage down-voltage state of the vehicle is judged; and when the high-voltage down state indicates that the current vehicle to be diagnosed has the high voltage down, sending a maintenance indicator lamp turn-on signal to the instrument controller. Whether a maintenance request exists is judged through the plug condition and the maintenance instruction of the detection diagnostic instrument, the whole vehicle breaks off the high voltage firstly, the maintenance indicator lamp is lightened after the high voltage of the whole vehicle is reduced, maintenance personnel only see that the maintenance indicator lamp is lightened to allow maintenance operation to be started, and only after the maintenance mode is quitted, the maintenance indicator lamp is extinguished, the whole vehicle is electrified under the high voltage, so that the whole vehicle is kept to break off the high voltage during maintenance, and personal injury is avoided.)

1. A diagnostic control method, characterized in that the method comprises:

detecting a unified diagnosis service UDS signal triggered by a vehicle to be diagnosed when a diagnostic instrument is inserted into the vehicle to be diagnosed;

when the UDS signal is detected, detecting a maintenance instruction sent by the diagnostic instrument;

according to the maintenance instruction, the high-voltage relay is controlled to be disconnected, and the high-voltage down-voltage state of the vehicle is judged;

and when the high-voltage reduction state indicates that the current vehicle to be diagnosed has reduced the high voltage, sending a maintenance indicator lamp starting signal to an instrument controller.

2. The diagnostic control method of claim 1, wherein said controlling a high voltage relay to open according to said service command comprises:

and controlling the positive relay, the negative relay, the pre-charging relay, the fast charging positive relay and the fast charging negative relay which are included by the high-voltage relay to be in a disconnection state according to the maintenance instruction.

3. The diagnostic control method according to claim 1, wherein the determining the vehicle high-voltage low-voltage state information includes:

acquiring a first voltage between a second end of a positive relay and a second end of a negative relay and a second voltage on a direct current bus of a motor, wherein a first end of the positive relay is connected with a positive electrode of a battery pack, and a first end of the negative relay is connected with a negative electrode of the battery pack;

when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value, determining that the first voltage and the second voltage are effective;

when the first voltage and the second voltage are effective, if the first voltage and the second voltage are both smaller than a safe voltage, the high-voltage low-voltage state information indicates that the vehicle is high-voltage currently.

4. The diagnostic control method of claim 1, further comprising:

when the maintenance indicator lamp is in an on state, detecting a UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed;

when the UDS signal is detected, detecting a maintenance ending instruction sent by the diagnostic instrument;

and according to the maintenance ending instruction, removing the control on the high-voltage relay, and sending a maintenance indicating lamp closing signal to the instrument controller.

5. A diagnostic control apparatus, characterized in that the apparatus comprises:

the system comprises a first detection module, a second detection module and a diagnosis module, wherein the first detection module is used for detecting a unified diagnosis service UDS signal triggered by a vehicle to be diagnosed when a diagnosis instrument is inserted into the vehicle to be diagnosed;

the second detection module is used for detecting a maintenance instruction sent by the diagnostic instrument when the UDS signal is detected;

the control module is used for controlling the high-voltage relay to be disconnected according to the maintenance instruction and judging the high-voltage low-voltage state of the vehicle;

and the first sending module is used for sending a maintenance indicator lamp starting signal to the instrument controller when the high voltage reduction state indicates that the current vehicle to be diagnosed has reduced high voltage.

6. The diagnostic control device of claim 5, wherein the control module is further configured to control a positive relay, a negative relay, a pre-charge relay, a fast positive relay, and a fast negative relay included in the high-voltage relay to be in an off state according to the maintenance instruction.

7. The diagnostic control device of claim 5, wherein the control module comprises:

the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first voltage between a second end of a positive relay and a second end of a negative relay and a second voltage on a direct current bus of a motor, the first end of the positive relay is connected with a positive electrode of a battery pack, and the first end of the negative relay is connected with a negative electrode of the battery pack;

the first judging unit is used for determining that the first voltage and the second voltage are effective when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value;

and the second judging unit is used for indicating that the vehicle is under high voltage currently if the first voltage and the second voltage are both smaller than a safe voltage when the first voltage and the second voltage are effective.

8. The diagnostic control apparatus of claim 5, further comprising:

the third detection module is used for detecting a UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed when the maintenance indicator lamp is in an on state;

the fourth detection module is used for detecting a maintenance finishing instruction sent by the diagnostic instrument when the UDS signal is detected;

and the second sending module is used for releasing the control on the high-voltage relay according to the maintenance ending instruction and sending a maintenance indicator lamp closing signal to the instrument controller.

9. An electric vehicle characterized by comprising the diagnostic control apparatus as set forth in any one of claims 5 to 8.

Technical Field

The invention relates to the technical field of automobiles, in particular to a diagnosis control method and device and an electric automobile.

Background

With the development of science and technology, automobiles become indispensable transportation means in daily life of people; because fuel oil is used as an unrenewable resource, more and more automobile manufacturers gradually focus on research and production of pure electric vehicles in order to reduce the usage amount of the fuel oil. The electric control of the whole vehicle is an important component of the pure electric vehicle control, and different from the traditional fuel vehicle, the pure electric vehicle has many high and low voltage parts, and the high voltage electric shock prevention of vehicle maintenance personnel is an important safety consideration item of the pure electric vehicle in the aspect of functional safety design.

At present, in the maintenance of general vehicles, maintenance personnel need to perform maintenance operation according to the requirements of safety guidelines of the maintenance operation. Therefore, in order to ensure personal safety, it is urgently needed to provide a safe and reliable method for ensuring that the vehicle is powered off under high voltage before maintenance and preventing misoperation in the maintenance process.

Disclosure of Invention

The embodiment of the invention provides a diagnosis control method and device and an electric automobile, and aims to solve the problem of how to reduce the risk of high-voltage electric shock caused by accidental electrification of the whole automobile due to misoperation.

In order to solve the above technical problem, an embodiment of the present invention provides a diagnostic control method, including:

detecting a unified diagnosis service UDS signal triggered by a vehicle to be diagnosed when a diagnostic instrument is inserted into the vehicle to be diagnosed;

when the UDS signal is detected, detecting a maintenance instruction sent by the diagnostic instrument;

according to the maintenance instruction, the high-voltage relay is controlled to be disconnected, and the high-voltage down-voltage state of the vehicle is judged;

and when the high-voltage reduction state indicates that the current vehicle to be diagnosed has reduced the high voltage, sending a maintenance indicator lamp starting signal to an instrument controller.

Further, according to the maintenance instruction, the control of the high-voltage relay to be disconnected comprises:

and controlling the positive relay, the negative relay, the pre-charging relay, the fast charging positive relay and the fast charging negative relay which are included by the high-voltage relay to be in a disconnection state according to the maintenance instruction.

Further, the determining the voltage state information under the high voltage of the vehicle includes:

acquiring a first voltage between a second end of a positive relay and a second end of a negative relay and a second voltage on a direct current bus of a motor, wherein a first end of the positive relay is connected with a positive electrode of a battery pack, and a first end of the negative relay is connected with a negative electrode of the battery pack;

when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value, determining that the first voltage and the second voltage are effective;

when the first voltage and the second voltage are effective, if the first voltage and the second voltage are both smaller than a safe voltage, the high-voltage low-voltage state information indicates that the vehicle is high-voltage currently.

Further, the method further comprises:

when the maintenance indicator lamp is in an on state, detecting a UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed;

when the UDS signal is detected, detecting a maintenance ending instruction sent by the diagnostic instrument;

and according to the maintenance ending instruction, removing the control on the high-voltage relay, and sending a maintenance indicating lamp closing signal to the instrument controller.

An embodiment of the present invention further provides a diagnostic control apparatus, where the apparatus includes:

the system comprises a first detection module, a second detection module and a diagnosis module, wherein the first detection module is used for detecting a unified diagnosis service UDS signal triggered by a vehicle to be diagnosed when a diagnosis instrument is inserted into the vehicle to be diagnosed;

the second detection module is used for detecting a maintenance instruction sent by the diagnostic instrument when the UDS signal is detected;

the control module is used for controlling the high-voltage relay to be disconnected according to the maintenance instruction and judging the high-voltage low-voltage state of the vehicle;

and the first sending module is used for sending a maintenance indicator lamp starting signal to the instrument controller when the high voltage reduction state indicates that the current vehicle to be diagnosed has reduced high voltage.

Further, the control module is also used for controlling the positive relay, the negative relay, the pre-charging relay, the fast-charging positive relay and the fast-charging negative relay which are included in the high-voltage relay to be in a disconnection state according to the maintenance instruction.

Further, the control module includes:

the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first voltage between a second end of a positive relay and a second end of a negative relay and a second voltage on a direct current bus of a motor, the first end of the positive relay is connected with a positive electrode of a battery pack, and the first end of the negative relay is connected with a negative electrode of the battery pack;

the first judging unit is used for determining that the first voltage and the second voltage are effective when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value;

and the second judging unit is used for indicating that the vehicle is under high voltage currently if the first voltage and the second voltage are both smaller than a safe voltage when the first voltage and the second voltage are effective.

Further, the apparatus further comprises:

the third detection module is used for detecting a UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed when the maintenance indicator lamp is in an on state;

the fourth detection module is used for detecting a maintenance finishing instruction sent by the diagnostic instrument when the UDS signal is detected;

and the second sending module is used for releasing the control on the high-voltage relay according to the maintenance ending instruction and sending a maintenance indicator lamp closing signal to the instrument controller.

The embodiment of the invention also provides an electric automobile which comprises the diagnosis control device.

The invention has the beneficial effects that:

according to the scheme, the whole vehicle controller judges whether a maintenance request exists through detecting the plugging condition of the diagnostic instrument and a sent maintenance instruction, the whole vehicle controller enters a maintenance mode after detecting that the diagnostic instrument is plugged in and the maintenance request is received, at the moment, the whole vehicle is firstly disconnected in high voltage, the maintenance indicator lamp is lightened after the whole vehicle is electrified under the high voltage, maintenance personnel only allow to start maintenance operation after seeing that the maintenance indicator lamp is lightened, and only after the whole vehicle is quitted from the maintenance mode, the maintenance indicator lamp is extinguished, the whole vehicle is only allowed to be electrified under high voltage, the whole vehicle is enabled to keep disconnected in high voltage during maintenance, and personal injury is avoided.

Drawings

FIG. 1 is a schematic flow chart diagram illustrating a diagnostic control method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a switching of a vehicle state according to an embodiment of the present invention;

fig. 3 is a schematic configuration diagram of a diagnostic control apparatus 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 will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a diagnosis control method and device and an electric automobile, aiming at solving the problem of how to reduce the risk of high-voltage electric shock caused by accidental electrification of the whole automobile due to misoperation.

As shown in fig. 1, an embodiment of the present invention provides a diagnostic control method, including:

and 11, detecting a unified diagnosis service UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed.

And 12, detecting a maintenance instruction sent by the diagnostic instrument when the UDS signal is detected.

And step 13, controlling the high-voltage relay to be disconnected according to the maintenance instruction, and judging the high-voltage low-voltage state of the vehicle.

And 14, when the high voltage reduction state indicates that the vehicle to be diagnosed is under high voltage at present, sending a maintenance indicator lamp starting signal to an instrument controller.

The vehicle controller in the embodiment of the invention judges whether a maintenance request exists by detecting the plugging condition of the diagnostic instrument and sending a maintenance instruction, and enters a maintenance mode after detecting that the diagnostic instrument is plugged in and the maintenance request is received, at the moment, the whole vehicle firstly cuts off the high voltage, the maintenance indicator lamp is lightened after the high voltage of the whole vehicle is ensured to be boosted, the maintenance personnel only allows the maintenance operation to be started after seeing that the maintenance indicator lamp is lightened, and the maintenance indicator lamp is extinguished after the maintenance mode is quitted, so that the whole vehicle is allowed to be electrified at high voltage during the maintenance period, and the whole vehicle is kept to be cut off the high voltage, thereby avoiding personal injury.

It should be noted that the automobile diagnostic device sending the maintenance instruction may be replaced by a button, a switch or other forms, the automobile diagnostic device, the button or the switch may be collectively referred to as a trigger device, and when the maintenance instruction needs to be sent, a maintenance worker operates the trigger device, and the trigger device generates the maintenance instruction and sends the maintenance instruction to the vehicle controller.

Specifically, the embodiment of the invention further confirms that the action is a conscious action and not misoperation by detecting the plugging and unplugging action of the diagnostic instrument, and the maintenance instruction sent by the diagnostic instrument is effective at this moment, so that the possibility that the whole vehicle is powered on at an unexpected high voltage during maintenance because the whole vehicle is not allowed to exit the maintenance mode by other people or the maintenance personnel does not see that the maintenance-allowed indicator lamp is extinguished when the whole vehicle is mistakenly exited from the maintenance mode is reduced.

Specifically, the step 13 of controlling the high-voltage relay to be turned off according to the maintenance instruction includes:

and controlling the positive relay, the negative relay, the pre-charging relay, the fast charging positive relay and the fast charging negative relay which are included by the high-voltage relay to be in a disconnection state according to the maintenance instruction.

It should be noted that, after receiving a maintenance instruction, the vehicle control unit sends a high-voltage relay disconnection signal to the battery management system through the CAN bus to instruct the disconnection of the relevant high-voltage relay, where the high-voltage relay includes: the relay comprises a positive relay, a negative relay, a pre-charging relay, a quick-charging positive relay and a quick-charging negative relay.

Specifically, in order to ensure that the entire vehicle has completed the high-voltage reduction, it is necessary to determine the collected related voltage, so the determining of the high-voltage reduction state information of the vehicle in step 13 includes:

acquiring a first voltage between a second end of a positive relay and a second end of a negative relay and a second voltage on a direct current bus of a motor, wherein a first end of the positive relay is connected with a positive electrode of a battery pack, and a first end of the negative relay is connected with a negative electrode of the battery pack; when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value, determining that the first voltage and the second voltage are effective; when the first voltage and the second voltage are effective, if the first voltage and the second voltage are both smaller than a safe voltage, the high-voltage low-voltage state information indicates that the vehicle is high-voltage currently.

It should be noted that the vehicle controller acquires the first voltage and the second voltage through the CAN bus, where the first voltage and the second voltage both CAN reflect the high-voltage state of the vehicle, and it is a redundancy design idea to use two signals and perform mutual verification, so as to meet the requirement of functional safety ASIL B class, and prevent the error of determining the high-voltage state of the vehicle due to the fault of the signal when only one signal is used, so that the maintenance personnel CAN mistakenly consider that the high-voltage power-off of the vehicle causes a high-voltage electric shock. The first voltage and the second voltage are reduced to be below the safe voltage after the high-voltage reduction is finished, the voltage on the direct-current bus of the motor is basically equal to the voltage at two ends of the power battery, when at least one voltage fails, the two voltage values have larger deviation, and therefore whether the voltage fails or not can be judged by calculating the absolute value of the difference value of the first voltage and the second voltage, and whether the two voltage values are effective or not can be judged. Further, when the first voltage and the second voltage are both smaller than the safety voltage, the whole vehicle is judged to be powered off at the high voltage; otherwise, the whole vehicle does not finish high-voltage reduction, the maintenance indicator lamp cannot be lightened, and maintenance personnel are forbidden to maintain the vehicle. The safe ultra-low voltage which allows continuous contact is 36V in general, so the safe voltage is 36V.

In the embodiment of the present invention, in step 14, when the high voltage low-voltage state indicates that the vehicle to be diagnosed is under a high voltage at present, a maintenance indicator lamp turning-on signal is sent to the instrument controller, and specifically, the vehicle controller sends the maintenance indicator lamp turning-on signal to the instrument controller through the CAN bus to indicate that the maintenance indicator lamp is turned on. The maintenance personnel can start to maintain only after seeing the maintenance pilot lamp and lighting, otherwise can not maintain.

It should be noted that, after the maintenance personnel completes the maintenance, the entire vehicle needs to be controlled to switch from the maintenance mode to the maintenance exit mode, so the method further includes:

when the maintenance indicator lamp is in an on state, detecting a UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed; when the UDS signal is detected, detecting a maintenance ending instruction sent by the diagnostic instrument; and according to the maintenance ending instruction, removing the control on the high-voltage relay, and sending a maintenance indicating lamp closing signal to the instrument controller.

It should be noted that, as shown in fig. 2, when the vehicle controller is powered on and initialized in one driving cycle, the diagnostic device insertion state and the vehicle maintenance mode are stored in the EEPROM. During the driving cycle, periodically detecting the insertion state of the diagnostic instrument and the maintenance mode of the whole vehicle, judging whether the insertion action exists according to whether the UDS signal is received or not to acquire the insertion state of the diagnostic instrument, entering the maintenance mode according to the received maintenance instruction or exiting the maintenance mode according to the received maintenance exit instruction, and storing the diagnostic instrument insertion state and the maintenance mode of the whole vehicle corresponding to the UDS signal and the maintenance instruction/exiting the maintenance instruction into the EEPROM before the driving cycle is finished. The whole vehicle controller judges the state of the whole vehicle when the whole vehicle controller is electrified and initialized in one driving cycle, reads the diagnostic instrument insertion state and the whole vehicle maintenance mode stored in the last driving cycle in the EEPROM, when the insertion action is in the maintenance mode state, the whole vehicle enters the maintenance mode state, and when the insertion action is in the maintenance mode state, the whole vehicle enters the maintenance mode state. And storing the current diagnostic instrument insertion state and the maintenance mode into the EEPROM before the driving cycle is finished.

As shown in fig. 3, an embodiment of the present invention further provides a diagnostic control apparatus, including:

a first detection module 31, configured to detect that a diagnostic device is inserted into a unified diagnostic service UDS signal triggered by a vehicle to be diagnosed.

A second detection module 32, configured to detect a maintenance instruction sent by the diagnostic apparatus when the UDS signal is detected.

And the control module 33 is used for controlling the high-voltage relay to be disconnected according to the maintenance instruction and judging the high-voltage low-voltage state of the vehicle.

And the first sending module 34 is configured to send a maintenance indicator lamp turn-on signal to the meter controller when the high voltage reduction state indicates that the vehicle to be diagnosed has a high voltage at present.

Specifically, the control module 33 is further configured to control the positive relay, the negative relay, the pre-charge relay, the fast charge positive relay, and the fast charge negative relay included in the high-voltage relay to be in an off state according to the maintenance instruction.

Specifically, the control module 33 includes:

the acquisition unit is used for acquiring a first voltage between a second end of the positive relay and a second end of the negative relay and a second voltage on a direct current bus of the motor, wherein a first end of the positive relay is connected with a positive pole of the battery pack, and a first end of the negative relay is connected with a negative pole of the battery pack.

The first judging unit is used for determining that the first voltage and the second voltage are effective when the absolute value of the difference value between the first voltage and the second voltage is smaller than a preset threshold value.

And the second judging unit is used for indicating that the vehicle is under high voltage currently if the first voltage and the second voltage are both smaller than a safe voltage when the first voltage and the second voltage are effective.

Specifically, the apparatus further comprises:

and the third detection module is used for detecting the UDS signal triggered by the diagnostic instrument inserted into the vehicle to be diagnosed when the maintenance indicator lamp is in an on state.

And the fourth detection module is used for detecting a maintenance finishing instruction sent by the diagnostic instrument when the UDS signal is detected.

And the second sending module is used for releasing the control on the high-voltage relay according to the maintenance ending instruction and sending a maintenance indicator lamp closing signal to the instrument controller.

The embodiment of the invention is a diagnosis control device corresponding to the embodiment of the diagnosis control method, and all implementation means in the embodiment of the diagnosis control method are applicable to the embodiment of the diagnosis control device, so that the same technical effects can be achieved.

The embodiment of the invention also provides an electric automobile which comprises the diagnosis control device.

It should be noted that, the vehicle controller in the electric vehicle provided with the diagnosis control device judges whether a maintenance request exists by detecting the plugging condition of the diagnosis instrument and sending a maintenance instruction, when the vehicle controller detects that the diagnosis instrument is plugged in and the maintenance request is received, the vehicle controller enters a maintenance mode, the whole vehicle firstly cuts off the high voltage, the maintenance indicator lamp is lightened after the high voltage of the whole vehicle is ensured, the maintenance personnel only allows to start the maintenance operation after seeing that the maintenance indicator lamp is lightened, and only after the vehicle controller exits the maintenance mode, the maintenance indicator lamp is extinguished, the whole vehicle is allowed to be electrified under the high voltage, so that the whole vehicle keeps cutting off the high voltage during the maintenance period, thereby avoiding personal injury.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.