CN109747423A - A kind of electric car Safety Shutdown System and method - Google Patents
A kind of electric car Safety Shutdown System and method Download PDFInfo
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- CN109747423A CN109747423A CN201910072942.3A CN201910072942A CN109747423A CN 109747423 A CN109747423 A CN 109747423A CN 201910072942 A CN201910072942 A CN 201910072942A CN 109747423 A CN109747423 A CN 109747423A
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Abstract
The present invention provides a kind of electric car Safety Shutdown Systems, comprising: fault detection unit, full-vehicle control unit and execution control unit.When fault detection unit detects high pressure leak current fault or collision situation, full-vehicle control unit issues safely disconnect instruction at the first time, execution control unit is issued simultaneously, can quickly disconnect the mechanical connection of the driving parts such as engine and motor Yu vehicle power train, guarantees machine security；In addition, quickly disconnecting the output loop that high pressure major loop relay can be external with cutoff high battery, guarantee electrical safety.The present invention also provides a kind of electric car safety cut-off methods.
Description
Technical Field
The invention relates to a safe turn-off system and a safe turn-off method, in particular to a safe turn-off system and a safe turn-off method for an electric automobile.
Background
The new energy automobile is generally driven by a plurality of power sources, the power sources comprise a driving motor, an engine and the like, and the motor can be driven by the engine simultaneously or independently to complete various whole automobile working modes. The driving motor for the electric automobile is generally a high-voltage permanent magnet synchronous motor, the system efficiency can be improved, and the requirements of the whole automobile on high power and long driving range can be met, however, the high-voltage safety problem exists due to the adoption of a high-voltage system (higher than the safe voltage of 60V); because the permanent magnet is arranged on the rotor of the permanent magnet synchronous motor, a larger back electromotive force can be generated when the permanent magnet synchronous motor fails at a high speed, the back electromotive force exceeds the withstand voltage of a device, the inverter and other parts in a high-voltage system can be damaged, and not only is economic damage caused, but also safety accidents such as electric shock of personnel can be caused. The risk of high voltage electric shock is called "electric shock" when 5mA of current flows through the human body, but when the human body exceeds 10mA, the human body is triggered to be cramped, so that the human body cannot get rid of the power supply. In order to avoid component damage and personnel electric shock risks caused by failure of a high-voltage electric drive system in a vehicle, a safety device and a corresponding control method need to be added to an electric vehicle to ensure safety.
Most of the existing safe shut-off methods do not fully consider the cooperative control of all assemblies of the whole vehicle, such as key parts of an engine, a transmission, a clutch and the like, the disconnection time sequence of each part is not defined, and particularly the shut-off sequence of high-voltage parts and the design of a back electromotive force inhibiting function are involved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a system and a method for safely turning off an electric vehicle, which comprehensively consider the cooperative control of each assembly of the whole vehicle, such as key parts of an engine, a transmission, a clutch and the like, and define the working time sequence of the key parts, so that the safety can be effectively ensured.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a safety turn-off system of an electric automobile, which comprises: a fault detection unit, a vehicle control unit and an execution control unit, wherein,
the fault detection unit is used for respectively detecting whether the whole vehicle high-voltage main loop has electric leakage and whether the whole vehicle has collision, generating corresponding detection signals and sending the detection signals to the whole vehicle control unit;
the whole vehicle control unit is used for generating a corresponding whole vehicle control instruction based on the detection signal and sending the corresponding whole vehicle control instruction to the execution control unit, wherein when the received detection signal is a signal representing that the whole vehicle high-voltage main loop has electric leakage and/or the whole vehicle has collision, a safety turn-off instruction for safely turning off the whole vehicle is generated;
and the execution control unit is used for controlling a driving component, a transmission component and a high-voltage component of the whole vehicle based on the whole vehicle control instruction, wherein the driving component, the transmission component and the high-voltage component are disconnected when the whole vehicle control instruction is a safety turn-off instruction.
Optionally, the fault detection unit comprises a leakage detection unit and a collision detection unit; wherein,
the leakage detection unit is used for detecting whether the whole vehicle high-voltage main loop has leakage or not, generating a corresponding leakage detection signal based on a detection result and sending the generated leakage detection signal to the whole vehicle control unit, wherein the leakage detection signal comprises a leakage fault signal for representing that the whole vehicle high-voltage main loop has leakage and a leakage detection normal signal for representing that the whole vehicle high-voltage main loop does not have leakage;
the collision detection unit is used for detecting whether the whole vehicle collides or not, generating a corresponding collision detection signal based on a detection result and sending the generated collision detection signal to the whole vehicle control unit, wherein the collision detection signal comprises a collision fault signal for representing that the whole vehicle collides and a fault detection normal signal for representing that the whole vehicle does not have faults.
Optionally, the execution control unit comprises an engine control unit, a motor control unit, a battery management unit and a transmission control unit, the driving component comprises an engine, an inverter and a driving motor, the transmission component comprises a transmission and a clutch, and the high-voltage component comprises a high-voltage loop relay; wherein,
the engine control unit is used for controlling the engine based on the received whole vehicle control instruction, and sending a fuel cut-off instruction to the engine when receiving the safety shut-off instruction;
the motor control unit is used for controlling the inverter based on a received whole vehicle control instruction so as to control the driving motor, wherein when the safe turn-off instruction is received, the current rotating speed of the driving motor is detected, and when the current rotating speed of the driving motor is detected to exceed the turning point rotating speed, a three-phase short circuit control instruction is sent to the inverter;
the battery management unit is used for controlling the high-voltage main loop relay based on a received vehicle control instruction, and disconnecting the high-voltage main loop relay when the safety turn-off instruction is received;
and the transmission control unit is used for controlling the transmission component based on the received whole vehicle control instruction, and disconnecting the transmission and the clutch when receiving the safe turn-off instruction.
Optionally, the motor control unit is further configured to send a three-phase open-circuit control instruction to the inverter when it is detected that the current rotation speed of the driving motor does not exceed the inflection point rotation speed, and start rapid discharge at the same time.
Another embodiment of the present invention further provides a method for safely turning off an electric vehicle, including:
respectively detecting whether the whole vehicle high-voltage main loop has electric leakage and whether the whole vehicle has collision, and generating corresponding detection signals;
generating a corresponding finished automobile control instruction based on the detection signal, wherein when the detection signal is determined to be a signal representing that the finished automobile high-voltage main loop has electric leakage and/or the finished automobile has collision, a safety turn-off instruction for safely turning off the finished automobile is generated;
and controlling a driving part, a transmission part and a high-voltage part of the whole vehicle based on the whole vehicle control command, wherein the driving part, the transmission part and the high-voltage part are disconnected when the whole vehicle control command is a safe turn-off command.
Optionally, whether there is electric leakage and whole car to whole car high pressure major loop and whether there is the collision to detect respectively, and it specifically includes to generate corresponding detected signal:
detecting whether the whole vehicle high-voltage main loop has electric leakage or not, and generating a corresponding electric leakage detection signal based on a detection result, wherein the electric leakage detection signal comprises an electric leakage fault signal for representing that the whole vehicle high-voltage main loop has electric leakage and an electric leakage detection normal signal for representing that the whole vehicle high-voltage main loop does not have electric leakage;
whether the whole vehicle has collision or not is detected, and a corresponding collision detection signal is generated based on a detection result, wherein the collision detection signal comprises a collision fault signal for representing that the whole vehicle has collision and a fault detection normal signal for representing that the whole vehicle has no fault.
Optionally, the driving component comprises an engine, an inverter and a driving motor, the transmission component comprises a transmission and a clutch, and the high-voltage component comprises a high-voltage circuit relay;
the control of the driving part, the transmission part and the high-voltage part of the whole vehicle based on the whole vehicle control command specifically comprises the following steps:
controlling the engine based on the whole vehicle control instruction, and sending a fuel cut-off instruction to the engine when the whole vehicle control instruction is determined to be the safe turn-off instruction;
controlling the inverter based on the finished automobile control instruction, and further controlling the driving motor, wherein when the finished automobile control instruction is determined to be the safe turn-off instruction, the current rotating speed of the driving motor is detected, and when the current rotating speed of the driving motor is detected to exceed the turning point rotating speed, a three-phase short circuit control instruction is sent to the inverter;
controlling the high-voltage main loop relay based on the finished vehicle control instruction, and switching off the high-voltage main loop relay when the finished vehicle control instruction is determined to be the safe switching-off instruction; and
and controlling the transmission component based on the finished automobile control instruction, and disconnecting the transmission and the clutch when the finished automobile control instruction is determined to be the safe turn-off instruction.
Optionally, the method further comprises: and when the current rotating speed is detected not to exceed the turning point rotating speed, sending a three-phase open circuit control instruction to the inverter, and simultaneously starting the rapid discharge.
According to the safe turn-off system and the safe turn-off method for the electric automobile, when electric leakage or collision occurs, a safe turn-off instruction is sent out at the first time, mechanical connection between driving components such as an engine and a motor and a finished automobile transmission system can be quickly disconnected, and mechanical safety is guaranteed; in addition, the high-voltage main circuit relay can be cut off by express delivery, so that the external output circuit of the high-voltage battery can be cut off, and the electrical safety is ensured.
Drawings
Fig. 1 is a block diagram of a safety shutdown system of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of a safety shutdown system of an electric vehicle according to an embodiment of the present invention;
FIG. 3 is a three-phase short-circuit current, short-circuit torque and rotation speed relationship curve according to the embodiment of the invention;
FIG. 4 is a schematic flow chart illustrating a method for safely shutting down an electric vehicle according to an embodiment of the present invention;
fig. 5 is a schematic specific flowchart of a method for safely turning off an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a block diagram of a safety shutdown system of an electric vehicle according to an embodiment of the present invention; FIG. 2 is a functional block diagram of a safety shutdown system of an electric vehicle according to an embodiment of the present invention; FIG. 3 is a three-phase short-circuit current, short-circuit torque and rotation speed relationship curve according to the embodiment of the invention; FIG. 4 is a schematic flow chart illustrating a method for safely shutting down an electric vehicle according to an embodiment of the present invention; fig. 5 is a schematic specific flowchart of a method for safely turning off an electric vehicle according to an embodiment of the present invention.
An embodiment of the present invention provides a safety shutdown system for an electric vehicle, as shown in fig. 1, including: the system comprises a fault detection unit 1, a whole vehicle control unit 2 and an execution control unit 3, wherein the fault detection unit 1 is used for respectively detecting whether a high-voltage main loop of the whole vehicle has electric leakage and whether the whole vehicle has collision, generating corresponding detection signals and sending the detection signals to the whole vehicle control unit; the whole vehicle control unit 2 is configured to generate a corresponding whole vehicle control instruction based on the detection signal and send the corresponding whole vehicle control instruction to the execution control unit, wherein when the received detection signal is a signal indicating that leakage exists in a whole vehicle high-voltage main circuit and/or collision exists in a whole vehicle, a safety shutdown instruction for safely shutting down the whole vehicle is generated; the execution control unit 3 is used for controlling the driving component 4, the transmission component 6 and the high-voltage component 5 of the whole vehicle based on the whole vehicle control instruction, wherein the whole vehicle control instruction is disconnected when being a safe turn-off instruction, the driving component 4, the transmission component 6 and the high-voltage component 5 are used for cutting off the mechanical connection between the driving component 4 and the whole vehicle transmission system and cutting off the external output loop of the high-voltage battery.
Specifically, in the embodiment of the present invention, as shown in fig. 2, the failure detection unit 1 includes a leakage detection unit 101 and a collision detection unit 102; the execution control unit 3 comprises an engine control unit 301, a motor control unit 302, a battery management unit 303 and a transmission control unit 304; the driving component 4 comprises an engine 401, an inverter 402 and a driving motor 403, the transmission component 6 comprises mechanical transmission components such as a transmission and a clutch, and the high-voltage component 5 is a high-voltage circuit relay.
The leakage detection unit 101 is configured to detect whether there is leakage in the entire vehicle high-voltage main circuit, generate a corresponding leakage detection signal based on a detection result, and send the generated leakage detection signal to the entire vehicle control unit, where the leakage detection signal includes a leakage fault signal indicating that there is leakage in the entire vehicle high-voltage main circuit and a leakage detection normal signal indicating that there is no leakage in the entire vehicle high-voltage main circuit. In the embodiment of the present invention, the output values of the leakage detection signal may be represented by values 1 and 0, respectively, where the value 1 represents the leakage fault signal and the value 0 represents the leakage detection normal signal. The collision detection unit 102 is configured to detect whether a collision exists in the entire vehicle, generate a corresponding collision detection signal based on a detection result, and send the generated collision detection signal to the entire vehicle control unit, where the collision detection signal includes a collision fault signal indicating that the entire vehicle has a collision and a fault detection normal signal indicating that the entire vehicle does not have a fault. In the embodiment of the present invention, the output values of the fault detection signals may be represented by values 1 and 0, respectively, where a value of 1 represents the collision fault signal and a value of 0 represents the collision detection normal signal.
And the vehicle control unit 2 is configured to generate a corresponding vehicle control instruction based on the detection signal, and send the vehicle control instruction to the engine control unit 301, the motor control unit 302, the battery management unit 303, and the transmission control unit 304 respectively. When receiving the leakage fault signal and/or the collision fault signal, that is, when receiving 1 from any one of the leakage detection unit 101 and the collision detection unit 102, a safety shutdown instruction that requires safety shutdown of the entire vehicle is generated. Otherwise, generating a safe normal instruction. In the embodiment of the invention, the output values of the control command for manufacturing the whole vehicle can be respectively represented by the values 1 and 0, wherein the value 1 represents the safety shutdown command, and the value 0 represents the safety normal command.
The engine control unit 301 is configured to control the engine based on a received vehicle control instruction, and send a fuel cut instruction to the engine 401 when receiving the safety shut-off instruction, that is, when receiving a value of 1; otherwise, no fuel cut-off instruction is sent.
The electricityA control unit 302, configured to control the inverter 402 based on a received vehicle control command, and further control the driving motor 403, wherein when the safety shutdown command is received, that is, when a value 1 is received, a current rotation speed of the driving motor is detected, and when it is detected that the current rotation speed exceeds an inflection point rotation speed ωgWhen the three-phase short circuit is detected, a three-phase short circuit control instruction is sent to the inverter 402, and the output value is 1; when the current rotating speed is detected not to exceed the turning point rotating speed, a three-phase open circuit control instruction is sent to the inverter, the output value is 0, and meanwhile, quick discharge is started to quickly discharge the energy storage device of the motor control unit 302. In the embodiment of the invention, three-phase short circuit control is that three tubes of an upper bridge arm of a three-phase bridge arm of an inverter are closed at the same time (in an ON state), or three tubes of a lower bridge arm are closed at the same time (in an ON state); and three-phase open circuit control, namely six tubes of a three-phase bridge arm of the inverter are simultaneously opened (in an OFF state). The inverter 402 may include six switching elements, each of which is an Insulated Gate Bipolar Transistor (IGBT), and receives a PWM signal from the motor control unit to control the corresponding three upper arm or lower arm switching elements to perform an ON (ON state) or OFF (OFF state) operation. The drive motor 403 is a three-phase permanent magnet synchronous motor, is a controlled object, and is controlled by the inverter 402.
Fig. 3 is a relationship curve of the three-phase short-circuit torque and the rotation speed of the present embodiment, in which the horizontal axis represents the mechanical rotation speed of the driving motor, and the vertical axis represents the three-phase short-circuit torque. The three-phase short-circuit torque of the permanent magnet synchronous motor is a resisting torque opposite to the mechanical rotating speed of the motor, so that the short-circuit torque is a negative value under the condition that the driving motor rotates in the forward direction as shown in fig. 3; along with the increase of the rotating speed, the absolute value of the short-circuit torque of the engine is increased and then reduced, and the rotating speed omega exceeds the inflection pointgAnd then gradually approaches zero. When electric leakage or collision occurs, the rotating speed of the permanent magnet synchronous motor is very high, large back electromotive force is generated, high-voltage electric shock risks exist, the back electromotive force of the motor can be restrained through three-phase short circuit control of the motor, and the situation that the back electromotive force of the motor generates high voltage and damages a high-voltage component through the rectification of an anti-parallel diode of an IGBT (insulated gate bipolar translator) or electric shock is caused when the electric leakage reaches a vehicle body is avoided. The purpose of the rapid discharge is to pass the DC side voltageThe motor winding is consumed, so that the voltage of the direct current bus is lower than 60V (safe voltage), and the safety is ensured. The two measures respectively inhibit the high voltage at the AC side and the DC side, and ensure the system safety.
The battery management unit 303 is configured to control the high-voltage main circuit relay based on a received vehicle control instruction, and directly cut off the high-voltage main circuit relay when the safety shutdown instruction is received, that is, when a value 1 is received; otherwise, the high-voltage main circuit relay is not cut off.
The transmission control unit 304 is configured to control the transmission device based on a received vehicle control instruction, and directly disconnect the transmission component 6 when receiving the safety shutdown instruction, that is, when receiving a value of 1; otherwise, it is not cut off.
According to the safe turn-off system of the electric automobile provided by the embodiment of the invention, when electric leakage or collision occurs, the whole automobile control unit sends out a safe turn-off instruction at the first time and simultaneously sends the safe turn-off instruction to the engine control unit, the motor control unit, the battery management unit and the transmission control unit, so that on one hand, the mechanical connection between driving parts such as an engine and a motor and the transmission parts can be quickly cut off, and the mechanical safety is ensured; on the other hand, the high-voltage main circuit relay can be quickly switched off to cut off an external output circuit of the high-voltage battery, so that the electrical safety is ensured.
Another embodiment of the present invention provides a safety shutdown method for an electric vehicle, which is performed by the safety system for an electric vehicle of the foregoing embodiment, as shown in fig. 4, and the method includes the following steps:
s101, respectively detecting whether electric leakage exists in a high-voltage main loop of the whole vehicle and whether collision exists in the whole vehicle, and generating corresponding detection signals;
s102, generating a corresponding finished automobile control instruction based on the detection signal, wherein when the detection signal is determined to be a signal representing that the finished automobile high-voltage main loop has electric leakage and/or the finished automobile has collision, a safety turn-off instruction for safely turning off the finished automobile is generated;
s103, controlling a driving component, a transmission component and a high-voltage component of the whole vehicle based on the whole vehicle control command, wherein the driving component, the transmission component and the high-voltage component are disconnected when the whole vehicle control command is a safe turn-off command.
Wherein, the step S101 is executed by the aforementioned fault detection unit 1, and the step may specifically include:
the method comprises the steps of firstly, detecting whether electric leakage exists in the whole vehicle high-voltage main loop or not, and generating corresponding electric leakage detection signals based on detection results, wherein the electric leakage detection signals comprise electric leakage fault signals representing that electric leakage exists in the whole vehicle high-voltage main loop and electric leakage detection normal signals representing that electric leakage does not exist in the whole vehicle high-voltage main loop.
In this step, performed by the aforementioned leakage detecting unit 101, the output values of the leakage detection signal may be represented by values 1 and 0, respectively, where the value 1 represents the leakage fault signal and the value 0 represents the leakage detection normal signal.
And secondly, detecting whether the whole vehicle has collision or not, and generating corresponding collision detection signals based on the detection result, wherein the collision detection signals comprise collision fault signals for representing that the whole vehicle has collision and fault detection normal signals for representing that the whole vehicle has no fault.
In this step, performed by the collision detection unit 102 as described above, the output values of the collision detection signals may be represented by values 1 and 0, respectively, where the value 1 represents the collision failure signal and the value 0 represents the collision detection normal signal.
In step S102, the control is executed by the entire vehicle control unit 2. When the vehicle control unit 2 receives the leakage fault signal and/or the collision fault signal, that is, when 1 is received from any one of the leakage detection unit 101 and the collision detection unit 102, a safety shutdown instruction for safely shutting down the vehicle is generated. Otherwise, generating a safe normal instruction. In the embodiment of the invention, the output values of the control command for manufacturing the whole vehicle can be respectively represented by the values 1 and 0, wherein the value 1 represents the safety shutdown command, and the value 0 represents the safety normal command.
In step S103, the control performed by the engine control unit 301, the motor control unit 302, the battery management unit 303 and the transmission control unit 304 may specifically include:
(1) the engine control unit 301 controls the engine based on the vehicle control instruction, and sends a fuel cut-off instruction to the engine when determining that the vehicle control instruction is the safety shut-off instruction.
(2) The motor control unit 302 controls the inverter based on the vehicle control instruction, and further controls the driving motor, wherein when the vehicle control instruction is determined to be the safe turn-off instruction, the current rotating speed of the driving motor is detected, and when the current rotating speed of the driving motor is detected to exceed the inflection point rotating speed, a three-phase short circuit control instruction is sent to the inverter; and when the current rotating speed is detected not to exceed the turning point rotating speed, sending a three-phase open circuit control instruction to the inverter, and simultaneously starting the rapid discharge.
(3) The battery management unit 303 controls the high-voltage main circuit relay based on the vehicle control instruction, and cuts off the high-voltage main circuit relay when it is determined that the vehicle control instruction is the safety shutdown instruction.
(4) The transmission control unit 304 controls the transmission component based on the vehicle control command, and disconnects the transmission and the clutch when determining that the vehicle control command is the safe shutdown command.
Specifically, as shown in fig. 5, the method for safely turning off an electric vehicle according to the embodiment of the present invention may include:
1. the whole vehicle control unit receives the fault detection signal and generates a whole vehicle control instruction, and concretely, the 'AND' calculation is carried out on the electric leakage fault signal and the collision signal, namely, if any input signal is 1, a safety shutdown instruction is output, and the instruction value is 1; otherwise, outputting a safe and normal instruction with the instruction value of 0.
2. The engine control unit judges a finished vehicle control instruction, and sends a fuel cut-off instruction to the engine when the value is 1; otherwise, the routine is exited. The motor control unit judges a control instruction of the whole vehicle, detects the current rotating speed when the value is 1, and detects the rotating speed omega if the rotating speed exceeds the inflection pointgIf yes, executing three-phase short circuit control; otherwise, three-phase open circuit control and rapid discharge are executed; and when the control command of the whole vehicle is 0, exiting the program. The battery management unit judges a finished vehicle control instruction, and executes the action of disconnecting the high-voltage main loop relay when the value is 1; otherwise, the routine is exited. The transmission control unit judges a finished vehicle control instruction, and executes the action of disconnecting the transmission component when the value is 1; otherwise, the routine is exited.
To sum up, the electric vehicle safety shutdown method provided by the embodiment of the invention at least has the following beneficial effects:
(1) when electric leakage or collision occurs, the rotating speed of the permanent magnet synchronous motor is very high, large back electromotive force is generated, high-voltage electric shock risks exist, the back electromotive force of the motor can be restrained through three-phase short circuit control of the motor, and the situation that the back electromotive force of the motor generates high voltage and damages a high-voltage component through the rectification of an anti-parallel diode of an IGBT (insulated gate bipolar translator) or electric shock is caused when the electric leakage reaches a vehicle body is avoided. In addition, the direct-current side voltage is consumed through the motor winding through quick discharge, so that the direct-current bus voltage is lower than 60V (safe voltage), and safety can be guaranteed. The two measures respectively inhibit the high voltage at the AC side and the DC side, and ensure the system safety.
(2) When a fault or collision occurs, the vehicle controller sends a safety disconnection instruction at the first time and simultaneously sends the safety disconnection instruction to the engine control unit, the motor control unit, the battery management unit and the transmission control unit, so that the mechanical connection between driving components such as an engine and a motor and a transmission system of the vehicle can be quickly disconnected, and the mechanical safety is ensured; on the other hand, the high-voltage main circuit relay is disconnected in an express way, so that the external output circuit of the high-voltage battery can be cut off, and the electrical safety is ensured.
The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An electric vehicle safety shutdown system, comprising: a fault detection unit, a vehicle control unit and an execution control unit, wherein,
the fault detection unit is used for respectively detecting whether the whole vehicle high-voltage main loop has electric leakage and whether the whole vehicle has collision, generating corresponding detection signals and sending the detection signals to the whole vehicle control unit;
the whole vehicle control unit is used for generating a corresponding whole vehicle control instruction based on the detection signal and sending the corresponding whole vehicle control instruction to the execution control unit, wherein when the received detection signal is a signal representing that the whole vehicle high-voltage main loop has electric leakage and/or the whole vehicle has collision, a safety turn-off instruction for safely turning off the whole vehicle is generated;
and the execution control unit is used for controlling a driving component, a transmission component and a high-voltage component of the whole vehicle based on the whole vehicle control instruction, wherein the driving component, the transmission component and the high-voltage component are disconnected when the whole vehicle control instruction is a safety turn-off instruction.
2. The electric vehicle safety shutdown system of claim 1, wherein the fault detection unit comprises a leakage detection unit and a collision detection unit; wherein,
the leakage detection unit is used for detecting whether the whole vehicle high-voltage main loop has leakage or not, generating a corresponding leakage detection signal based on a detection result and sending the generated leakage detection signal to the whole vehicle control unit, wherein the leakage detection signal comprises a leakage fault signal for representing that the whole vehicle high-voltage main loop has leakage and a leakage detection normal signal for representing that the whole vehicle high-voltage main loop does not have leakage;
the collision detection unit is used for detecting whether the whole vehicle collides or not, generating a corresponding collision detection signal based on a detection result and sending the generated collision detection signal to the whole vehicle control unit, wherein the collision detection signal comprises a collision fault signal for representing that the whole vehicle collides and a fault detection normal signal for representing that the whole vehicle does not have faults.
3. The electric vehicle safety shutdown system of claim 1, wherein the execution control unit comprises an engine control unit, a motor control unit, a battery management unit, and a transmission control unit, the driving components comprise an engine, an inverter, and a driving motor, the transmission components comprise a transmission and a clutch, and the high-voltage components comprise a high-voltage circuit relay; wherein,
the engine control unit is used for controlling the engine based on the received whole vehicle control instruction, and sending a fuel cut-off instruction to the engine when receiving the safety shut-off instruction;
the motor control unit is used for controlling the inverter based on a received whole vehicle control instruction so as to control the driving motor, wherein when the safe turn-off instruction is received, the current rotating speed of the driving motor is detected, and when the current rotating speed of the driving motor is detected to exceed the turning point rotating speed, a three-phase short circuit control instruction is sent to the inverter;
the battery management unit is used for controlling the high-voltage main loop relay based on a received vehicle control instruction, and disconnecting the high-voltage main loop relay when the safety turn-off instruction is received;
and the transmission control unit is used for controlling the transmission component based on the received whole vehicle control instruction, and disconnecting the transmission and the clutch when receiving the safe turn-off instruction.
4. The electric vehicle safety shutdown system of claim 3,
the motor control unit is also used for sending a three-phase open circuit control instruction to the inverter and starting rapid discharge when detecting that the current rotating speed of the driving motor does not exceed the turning point rotating speed.
5. A safe shutdown method for an electric vehicle is characterized by comprising the following steps:
respectively detecting whether the whole vehicle high-voltage main loop has electric leakage and whether the whole vehicle has collision, and generating corresponding detection signals;
generating a corresponding finished automobile control instruction based on the detection signal, wherein when the detection signal is determined to be a signal representing that the finished automobile high-voltage main loop has electric leakage and/or the finished automobile has collision, a safety turn-off instruction for safely turning off the finished automobile is generated;
and controlling a driving part, a transmission part and a high-voltage part of the whole vehicle based on the whole vehicle control command, wherein the driving part, the transmission part and the high-voltage part are disconnected when the whole vehicle control command is a safe turn-off command.
6. The safety turn-off method for the electric vehicle according to claim 5, wherein the detecting whether the electric leakage exists in the high-voltage main loop of the whole vehicle and whether the collision exists in the whole vehicle respectively and generating the corresponding detection signals specifically comprise:
detecting whether the whole vehicle high-voltage main loop has electric leakage or not, and generating a corresponding electric leakage detection signal based on a detection result, wherein the electric leakage detection signal comprises an electric leakage fault signal for representing that the whole vehicle high-voltage main loop has electric leakage and an electric leakage detection normal signal for representing that the whole vehicle high-voltage main loop does not have electric leakage;
whether the whole vehicle has collision or not is detected, and a corresponding collision detection signal is generated based on a detection result, wherein the collision detection signal comprises a collision fault signal for representing that the whole vehicle has collision and a fault detection normal signal for representing that the whole vehicle has no fault.
7. The electric vehicle safety shutdown method according to claim 5, wherein the driving components include an engine, an inverter, and a driving motor, the transmission components include a transmission and a clutch, and the high-voltage component includes a high-voltage circuit relay;
the control of the driving part, the transmission part and the high-voltage part of the whole vehicle based on the whole vehicle control command specifically comprises the following steps:
controlling the engine based on the whole vehicle control instruction, and sending a fuel cut-off instruction to the engine when the whole vehicle control instruction is determined to be the safe turn-off instruction;
controlling the inverter based on the finished automobile control instruction, and further controlling the driving motor, wherein when the finished automobile control instruction is determined to be the safe turn-off instruction, the current rotating speed of the driving motor is detected, and when the current rotating speed of the driving motor is detected to exceed the turning point rotating speed, a three-phase short circuit control instruction is sent to the inverter;
controlling the high-voltage main loop relay based on the finished vehicle control instruction, and switching off the high-voltage main loop relay when the finished vehicle control instruction is determined to be the safe switching-off instruction; and
and controlling the transmission component based on the finished automobile control instruction, and disconnecting the transmission and the clutch when the finished automobile control instruction is determined to be the safe turn-off instruction.
8. The electric vehicle safety shutdown method according to claim 7, further comprising:
and when the current rotating speed is detected not to exceed the turning point rotating speed, sending a three-phase open circuit control instruction to the inverter, and simultaneously starting the rapid discharge.
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| CN112895902A (en) * | 2021-02-07 | 2021-06-04 | 中国第一汽车股份有限公司 | Power distribution system, control method of power distribution system and new energy automobile |
| CN113428015A (en) * | 2020-03-18 | 2021-09-24 | 比亚迪股份有限公司 | Motor control system and method and electric vehicle |
| CN113895376A (en) * | 2021-09-29 | 2022-01-07 | 岚图汽车科技有限公司 | Hybrid vehicle safety protection method and system |
| CN114030458A (en) * | 2021-11-09 | 2022-02-11 | 东风汽车集团股份有限公司 | Hybrid vehicle control method, device, equipment and medium |
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