CN112046289A

CN112046289A - Electric vehicle, drive control system thereof and fault detection control method

Info

Publication number: CN112046289A
Application number: CN202010859888.XA
Authority: CN
Inventors: 王瑛; 刘新超; 陈亚莉; 周旗; 关志强; 张�杰
Original assignee: Chery New Energy Automobile Co Ltd
Current assignee: Chery New Energy Automobile Co Ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2020-12-08
Anticipated expiration: 2040-08-24
Also published as: CN112046289B

Abstract

The invention discloses an electric vehicle and a driving control system and a fault detection control method thereof, wherein the system comprises: the vehicle control unit is used for detecting whether an external fault occurs or not so as to output a first enabling signal; the motor controller comprises a main control chip, a fault detection circuit, a fault processing circuit and a driving circuit, wherein the main control chip is used for detecting whether a driving system fault occurs to output a second enabling signal and outputting a PWM signal to the logic processing circuit, the fault detection circuit is used for detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur to output a third enabling signal, the fault processing circuit is used for generating the IGBT enabling signal according to the first enabling signal, the second enabling signal and the third enabling signal and sending the IGBT enabling signal to the logic processing circuit, the logic processing circuit is used for controlling the driving circuit to stop outputting the driving signal when the PWM signal is blocked according to the IGBT enabling signal, and the driving circuit is used for driving the IGBT, so that the PWM signal is blocked after the electric vehicle detects the fault to realize the rapid turn-off of the IGBT.

Description

Electric vehicle, drive control system thereof and fault detection control method

Technical Field

The invention relates to the technical field of new energy automobiles, in particular to a drive control system of an electric vehicle, the electric vehicle and a fault detection control method of the drive control system of the electric vehicle.

Background

At present, in an electric vehicle of the related art, a motor main control chip in a driving motor controller receives an operation parameter signal fed back by the vehicle and outputs a corresponding PWM wave for controlling on and off of an IGBT.

However, the related art has a problem that, after some faults are triggered, the driving motor controller needs to shut down the output of the PWM wave through a software running period, so that when some faults with large damage degree and high severity level occur, the faults cannot be responded in time, the service life of the electronic device is reduced, even the electronic device is damaged, and the reliability of the circuit is low.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a driving control system for an electric vehicle, which can block a PWM signal to realize rapid turn-off of an IGBT after the electric vehicle detects a fault.

A second object of the present invention is to provide an electric vehicle.

A third object of the present invention is to provide a failure detection control method of a drive control system of an electric vehicle.

To achieve the above object, a drive control system for an electric vehicle according to a first aspect of an embodiment of the present invention includes: the vehicle control unit is used for detecting whether an external fault occurs or not so as to output a first enabling signal; the motor controller comprises a fault detection circuit, a fault processing circuit, a logic processing circuit, a drive circuit and a main control chip, the main control chip is used for detecting whether a driving system fault occurs or not to output a second enabling signal, and outputs PWM signals to the logic processing circuit, the fault detection circuit is used for detecting whether bus overvoltage faults, phase overcurrent faults and IGBT over-temperature faults occur or not to output a third enabling signal, the fault handling circuit generates an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal, and sending the IGBT enable signal to the logic processing circuit, the logic processing circuit judges whether to block the PWM signal according to the IGBT enable signal, and controlling the driving circuit to stop outputting the driving signal when the PWM signal is blocked.

According to the driving control system of the electric vehicle provided by the embodiment of the invention, firstly, whether an external fault occurs is detected by the vehicle control unit to output a first enabling signal, and the main control chip detects whether the driving system has a fault to output a second enable signal and outputs a PWM signal to the logic processing circuit, and detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur through a fault detection circuit to output a third enabling signal, then, generating an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal through a fault processing circuit, sending the IGBT enable signal to a logic processing circuit, and finally, and judging whether the PWM signal is blocked or not according to the IGBT enable signal through the logic processing circuit, and controlling the driving circuit to stop outputting the driving signal when the PWM signal is blocked. Therefore, after the electric vehicle detects the fault, the PWM signal is blocked so as to realize the rapid turn-off of the IGBT.

In addition, the drive control system of the electric vehicle according to the above-described embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the present invention, when the vehicle control unit detects that an external fault occurs, a first enable signal output by the vehicle control unit is at a low level, when the main control chip detects that a driving system fault occurs, a second enable signal output by the main control chip is at a low level, when the fault detection circuit detects that any one of the bus overvoltage fault, the phase overcurrent fault, and the IGBT over-temperature fault occurs, a third enable signal output by the fault processing circuit is at a low level, when any one of the first enable signal, the second enable signal, and the third enable signal is at a low level, the IGBT enable signal output by the fault processing circuit is at a low level, and the logic processing circuit blocks the PWM signal when the IGBT enable signal is at a low level.

According to one embodiment of the invention, the drive system fault includes one or more of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, a phase a current overcurrent fault, a phase B current overcurrent fault, a phase C current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric drive system mode fault, and a loop interlock fault.

According to an embodiment of the present invention, the external fault includes a fault of another controller received by the vehicle controller through a CAN bus and a fault detected by the vehicle controller itself.

In order to achieve the above object, an electric vehicle according to an embodiment of a second aspect of the present invention includes the above drive control system for an electric vehicle.

According to the electric vehicle provided by the embodiment of the invention, by adopting the driving control system of the electric vehicle, the PWM signal can be blocked after the electric vehicle detects a fault, so that the IGBT can be quickly turned off.

In order to achieve the above object, a failure detection control method of a drive control system of an electric vehicle according to an embodiment of a third aspect of the present invention includes the steps of: detecting whether an external fault occurs to output a first enabling signal, detecting whether a driving system fault occurs to output a second enabling signal, and detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur to output a third enabling signal; generating an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal, and judging whether to block a PWM signal of a motor controller according to the IGBT enable signal; and if the PWM signal of the motor controller is blocked, controlling the motor controller to stop outputting the driving signal.

According to the fault detection control method of the drive control system of the electric vehicle of the embodiment of the invention, firstly, whether an external fault occurs or not is detected to output a first enable signal, whether a drive system fault occurs or not is detected to output a second enable signal, whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur or not is detected to output a third enable signal, then an IGBT enable signal is generated according to the first enable signal, the second enable signal and the third enable signal, whether a PWM signal of a motor controller is blocked or not is judged according to the IGBT enable signal, and finally, if the PWM signal of the motor controller is blocked, the motor controller is controlled to stop outputting the drive signal. Therefore, after the electric vehicle detects the fault, the PWM signal is blocked so as to realize the rapid turn-off of the IGBT.

In addition, the failure detection control method of the drive control system of the electric vehicle according to the above-described embodiment of the invention may also have the following additional technical features:

according to one embodiment of the invention, when an external fault is detected to occur, the output first enabling signal is in a low level; when the driving system fault is detected to occur, the output second enabling signal is at a low level; when any fault of the bus overvoltage fault, the phase overcurrent fault and the IGBT over-temperature fault is detected to occur, a third enabling signal output is a low level; wherein the IGBT enable signal output is at a low level when any one of the first enable signal, the second enable signal, and the third enable signal is at a low level, and the PWM signal is blocked when the IGBT enable signal is at a low level.

According to one embodiment of the present invention, the external fault includes a fault of another controller received by the vehicle controller through the CAN bus and a fault detected by the vehicle controller itself.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a block schematic diagram of a drive control system of an electric vehicle according to an embodiment of the invention;

fig. 2 is a schematic configuration diagram of a drive control system of an electric vehicle according to an embodiment of the present invention;

FIG. 3 is a block schematic diagram of an electric vehicle according to an embodiment of the invention;

fig. 4 is a flowchart schematically illustrating a fault detection control method of a drive control system of an electric vehicle according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating a fault detection control method of a drive control system of an electric vehicle according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A drive control system of an electric vehicle, and a failure detection control method of a drive control system of an electric vehicle according to embodiments of the present invention are described below with reference to the drawings.

Fig. 1 is a block diagram schematically illustrating a drive control system of an electric vehicle according to an embodiment of the present invention.

As shown in fig. 1, a drive control system 100 of an electric vehicle includes: vehicle control unit 1 and motor controller 2.

Specifically, as shown in fig. 1, the vehicle control unit 1 is configured to detect whether an external fault occurs to output a first enable signal; the motor controller 2 comprises a fault detection circuit 21, a main control chip 22, a fault processing circuit 23, a logic processing circuit 24 and a driving circuit 25, wherein the main control chip 22 is used for detecting whether a driving system fault occurs to output a second enabling signal and outputting a PWM signal to the logic processing circuit 24, the fault detection circuit 21 is used for detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur to output a third enabling signal, the fault processing circuit 23 generates an IGBT enabling signal according to the first enabling signal, the second enabling signal and the third enabling signal and sends the IGBT enabling signal to the logic processing circuit 24, and the logic processing circuit 24 judges whether the PWM signal is blocked according to the IGBT enabling signal and controls the driving circuit 25 to stop outputting the driving signal when the PWM signal is blocked.

It should be noted that the main control chip 22 performs software detection and report through the sampled data, the fault detection circuit 21 performs software detection and report through the hardware circuit, and the main control chip 22 calculates a PWM signal according to the sampled phase current, the position signal and the torque command received by the CAN network, and outputs the PWM signal to the logic processing circuit 24.

Specifically, the fault processing circuit 23 generates an IGBT enable signal according to a first enable signal output by the vehicle control unit 1, a second enable signal output by the main control chip 22, and a third enable signal output by the fault processing circuit 23, and sends the IGBT enable signal to the logic processing circuit 24, and then the logic circuit 24 controls the driving circuit 25 according to the IGBT enable signal to control on and off of the IGBT, so that the PWM signal can be blocked in time after the electric vehicle detects a fault, and the IGBT is turned off quickly.

Further, when the vehicle control unit 1 detects that an external fault occurs, the first enable signal output is at a low level, the main control chip 22 detects that a second enable signal output when a driving system fault occurs is at a low level, the fault detection circuit 21 detects that any one of a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occurs, the third enable signal output when the fault detection circuit 21 detects that any one of the bus overvoltage fault, the phase overcurrent fault and the IGBT over-temperature fault occurs is at a low level, the IGBT enable signal output by the fault processing circuit 23 is at a low level when any one of the first enable signal, the second enable signal and the third enable signal is at a low level, and the logic processing circuit 24 blocks the PWM signal when the IGBT enable signal is at a low level.

That is, if the vehicle control unit 1 detects that an external fault occurs, the output first enable signal is at a low level, if the main control chip 22 detects that a drive system fault occurs, the output second enable signal is at a low level, and if the fault detection circuit 21 detects that any fault among a bus overvoltage fault, a phase overcurrent fault, and an IGBT overheat fault occurs, the output third enable signal is at a low level.

It should be understood that if the vehicle control unit 1 does not detect that an external fault occurs, a high-level first enable signal is output, if the main control chip 22 does not detect that a driving system fault occurs, a high-level second enable signal is output, and if the fault detection circuit 21 does not detect that a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur, a high-level third enable signal is output.

Further, the IGBT enable signal outputted by the fault processing circuit 23 is at a low level when any one of the first enable signal, the second enable signal, and the third enable signal is at a low level, and the logic processing circuit 24 blocks the PWM signal when the IGBT enable signal is at a low level.

Therefore, various fault detections are realized through the vehicle control unit, the main control chip and the fault detection circuit, and when a fault occurs, the IGBT is controlled to be rapidly turned off through the fault processing circuit and the logic processing circuit, so that the stability and the reliability of the drive control system 100 of the electric vehicle are improved.

Further, in an embodiment of the present invention, the external fault may include a fault of another controller or a fault detected by the vehicle control unit 10 itself, and the driving system fault may include one or more of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, an a-phase current overcurrent fault, a B-phase current overcurrent fault, a C-phase current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric driving system mode fault, and a loop interlock fault.

In other words, when a fault of another controller received by the vehicle control unit 10 through the CAN bus and a fault detected by the vehicle control unit 10 itself occur, a first enable signal of a low level is output; when the main control chip 22 detects that one or more faults of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, a phase A current overcurrent fault, a phase B current overcurrent fault, a phase C current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric drive system mode fault and a loop interlocking fault occur, outputting a low-level second enabling signal; when the fault detection circuit 21 detects that any fault of the bus overvoltage fault, the phase overcurrent fault and the IGBT over-temperature fault occurs, a third enabling signal with a low level is output.

The operation principle of the driving control system 100 of the electric vehicle according to the embodiment of the present invention will be described with reference to fig. 2 and the embodiment of the present invention.

As shown in fig. 3, the output terminal of the vehicle control unit 1 is connected to the first input terminal a of the fault processing circuit 23; the output of the fault detection circuit 21 is connected to a second input b of the fault handling circuit 23; the output end of the main control chip 22 is connected to the third input end c of the fault processing circuit 23 and the first input end d of the logic processing circuit 24, the output end of the fault processing circuit 23 is connected to the second input end e of the logic processing circuit 24, and the output end of the logic processing circuit 24 is connected to the input end of the driving circuit 25.

It should be understood that if the IGBT enable signal is at a high level, the logic processing circuit 24 may control the on and off of the IGBT according to the PWM signal output by the main control chip 22, and if the IGBT enable signal is at a low level, the logic processing circuit 24 is turned off, and the PWM signal output by the main control chip 22 is blocked.

Specifically, if the vehicle control unit 1 does not detect that an external fault occurs, the main control chip 22 does not detect that a driving system fault occurs, and the fault processing circuit 23 does not detect that any fault among a bus overvoltage fault, a phase overcurrent fault, and an IGBT over-temperature fault occurs, the vehicle control unit 1, the main control chip 22, and the fault processing circuit 23 respectively output a first enable signal, a second enable signal, and a third enable signal at a high level, at this time, the fault processing circuit 23 outputs an IGBT enable signal at a high level to the logic processing circuit 24 according to the first enable signal, the second enable signal, and the third enable signal, and the logic processing circuit 24 controls the driving circuit 25 to output a driving signal so as to control the IGBT to be turned on and off according to the PWM signal.

And, if the drive control system 100 of the electric vehicle detects a fault, for example, if the vehicle control unit 10 detects an external fault, or the main control chip 22 detects a drive system fault, or the fault detection circuit 21 detects any fault of a bus overvoltage fault, a phase overcurrent fault, and an IGBT over-temperature fault, outputting a first enable signal and/or a second enable signal and/or a third enable signal at a low level, and at this time, the fault processing circuit 23 outputs an IGBT enable signal at a low level to the logic processing circuit 24 according to the first enable signal, the second enable signal, and the third enable signal, so as to block the PWM signal by the logic processing circuit 24, thereby controlling the IGBT to be turned off quickly.

In addition, other configurations and functions of the electric vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.

In summary, according to the driving control system of the electric vehicle provided by the embodiment of the invention, firstly, the vehicle control unit detects whether an external fault occurs to output the first enable signal, and the main control chip detects whether the driving system has a fault to output a second enable signal and outputs a PWM signal to the logic processing circuit, and detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur through a fault detection circuit to output a third enabling signal, then, generating an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal through a fault processing circuit, sending the IGBT enable signal to a logic processing circuit, and finally, and judging whether the PWM signal is blocked or not according to the IGBT enable signal through the logic processing circuit, and controlling the driving circuit to stop outputting the driving signal when the PWM signal is blocked. Therefore, after the electric vehicle detects the fault, the PWM signal is blocked so as to realize the rapid turn-off of the IGBT.

Fig. 3 is a block schematic diagram of an electric vehicle according to an embodiment of the invention. Further, as shown in fig. 4, an embodiment of the present invention proposes an electric vehicle 1000 including the drive control system 100 of the electric vehicle of the above-described embodiment of the present invention.

In summary, according to the electric vehicle of the embodiment of the invention, by using the driving control system of the electric vehicle, after the electric vehicle detects a fault, the PWM signal can be blocked, so as to realize the rapid turn-off of the IGBT.

Fig. 4 is a flowchart illustrating a fault detection control method of a drive control system of an electric vehicle according to an embodiment of the present invention. As shown in fig. 4, the failure detection control method of the drive control system of the electric vehicle includes the steps of:

s101, detecting whether an external fault occurs to output a first enabling signal, detecting whether a driving system fault occurs to output a second enabling signal, and detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur to output a third enabling signal.

And S102, generating an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal, and judging whether to block the PWM signal of the motor controller according to the IGBT enable signal.

And S103, if the PWM signal of the motor controller is blocked, controlling the motor controller to stop outputting the driving signal.

Therefore, according to the fault detection control method of the drive control system of the electric vehicle, provided by the embodiment of the invention, the IGBT enable signal is generated according to the first enable signal, the second enable signal and the third enable signal, and the motor controller is controlled to stop outputting the drive signal when the PWM signal of the motor controller is judged to be blocked according to the IGBT enable signal, so that the PWM signal can be blocked in time after the electric vehicle detects the fault, and the IGBT is quickly turned off.

Further, as shown in fig. 5, the method for controlling the failure detection of the drive control system of the electric vehicle further includes:

s201, when detecting that an external fault occurs, the output first enable signal is at a low level.

And S202, outputting a second enable signal to be in a low level when the driving system fault is detected.

And S203, outputting a third enable signal at a low level when any fault of the bus overvoltage fault, the phase overcurrent fault and the IGBT over-temperature fault is detected.

And S204, when any one of the first enable signal, the second enable signal and the third enable signal is in a low level, the output IGBT enable signal is in a low level, and the PWM signal is blocked when the IGBT enable signal is in the low level.

Further, the drive system fault includes one or more of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, a phase a current overcurrent fault, a phase B current overcurrent fault, a phase C current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric drive system mode fault, and a loop interlock fault.

Further, the external fault includes a fault of another controller received by the vehicle controller through the CAN bus and a fault detected by the vehicle controller itself.

It should be noted that the specific implementation of the method for detecting a fault of the driving control system of the electric vehicle according to the embodiment of the present invention corresponds to the specific implementation of the driving control system of the electric vehicle according to the embodiment of the present invention, and details are not repeated herein.

In summary, according to the fault detection control method of the drive control system of the electric vehicle according to the embodiment of the present invention, first, whether an external fault occurs is detected to output a first enable signal, whether a drive system fault occurs to output a second enable signal, and whether a bus overvoltage fault, a phase overcurrent fault, and an IGBT overheat fault occur to output a third enable signal, then, an IGBT enable signal is generated according to the first enable signal, the second enable signal, and the third enable signal, and whether a PWM signal of the motor controller is blocked is determined according to the IGBT enable signal, and finally, if the PWM signal of the motor controller is blocked, the motor controller is controlled to stop outputting the drive signal. Therefore, after the electric vehicle detects the fault, the PWM signal is blocked so as to realize the rapid turn-off of the IGBT.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A drive control system of an electric vehicle, characterized by comprising:

the vehicle control unit is used for detecting whether an external fault occurs or not so as to output a first enabling signal;

the motor controller comprises a fault detection circuit, a fault processing circuit, a logic processing circuit, a drive circuit and a main control chip, the main control chip is used for detecting whether a driving system fault occurs or not to output a second enabling signal, and outputs PWM signals to the logic processing circuit, the fault detection circuit is used for detecting whether bus overvoltage faults, phase overcurrent faults and IGBT over-temperature faults occur or not to output a third enabling signal, the fault handling circuit generates an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal, and sending the IGBT enable signal to the logic processing circuit, the logic processing circuit judges whether to block the PWM signal according to the IGBT enable signal, and controlling the driving circuit to stop outputting the driving signal when the PWM signal is blocked.

2. The drive control system of an electric vehicle according to claim 1, wherein the vehicle control unit detects that a first enable signal output when an external fault occurs is at a low level, the main control chip detects that a second enable signal output when a drive system fault occurs is at a low level, the fault detection circuit detects that a third enable signal output when any one of the bus overvoltage fault, the phase overcurrent fault, and the IGBT overheat fault occurs is at a low level, the fault processing circuit outputs an IGBT enable signal when any one of the first enable signal, the second enable signal, and the third enable signal is at a low level, and the logic processing circuit blocks the PWM signal when the IGBT enable signal is at a low level.

3. The drive control system of an electric vehicle according to claim 1 or 2, characterized in that the drive system fault includes one or more of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, a phase a current overcurrent fault, a phase B current overcurrent fault, a phase C current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric drive system mode fault, and a loop interlock fault.

4. The drive control system of an electric vehicle according to claim 1 or 2, wherein the external fault includes a fault of another controller received by the vehicle controller through a CAN bus and a fault detected by the vehicle controller itself.

5. An electric vehicle characterized by comprising the drive control system of the electric vehicle according to any one of claims 1 to 4.

6. A failure detection control method of a drive control system of an electric vehicle, characterized by comprising the steps of:

detecting whether an external fault occurs to output a first enabling signal, detecting whether a driving system fault occurs to output a second enabling signal, and detecting whether a bus overvoltage fault, a phase overcurrent fault and an IGBT over-temperature fault occur to output a third enabling signal;

generating an IGBT enable signal according to the first enable signal, the second enable signal and the third enable signal, and judging whether to block a PWM signal of a motor controller according to the IGBT enable signal;

and if the PWM signal of the motor controller is blocked, controlling the motor controller to stop outputting the driving signal.

7. The failure detection control method of a drive control system of an electric vehicle according to claim 6,

when the external fault is detected to occur, the output first enabling signal is at a low level;

when the driving system fault is detected to occur, the output second enabling signal is at a low level;

when any fault of the bus overvoltage fault, the phase overcurrent fault and the IGBT over-temperature fault is detected to occur, a third enabling signal output is a low level;

wherein the IGBT enable signal output is at a low level when any one of the first enable signal, the second enable signal, and the third enable signal is at a low level, and the PWM signal is blocked when the IGBT enable signal is at a low level.

8. The fault detection control method of the drive control system of the electric vehicle according to claim 6 or 7, wherein the drive system fault includes one or more of a bus overcurrent fault, a bus overvoltage fault, a bus undervoltage fault, an a-phase current overcurrent fault, a B-phase current overcurrent fault, a C-phase current overcurrent fault, a motor overspeed fault, a torque monitoring fault, a motor over-temperature fault, a motor controller over-temperature fault, an electric drive system mode fault, and a loop interlock fault.

9. The fault detection control method of the drive control system of the electric vehicle according to claim 6 or 7, wherein the external fault includes a fault of another controller received by the vehicle controller through a CAN bus and a fault detected by the vehicle controller itself.