Automobile drive motor safety state control device and control method

Abstract

The application relates to the technical field of motor control, and discloses a kind of automobile drive motor safety state control device and control method, device includes: power supply chip, processor, motor speed acquisition module, switch module, ASC logic module and motor control module;The side of switch module is connected with power supply chip, processor and motor speed acquisition module respectively, and the other side is connected with ASC logic module;ASC logic module is connected with motor control module;Motor speed acquisition module is based on received first safety state control signal and / or second safety state control signal and combines preset reference voltage to switch module and outputs first control signal;Switch module determines the output of triac signal to ASC logic module according to first control signal in first safety state control signal, second safety state control signal and first control signal to make it carry out corresponding safety state control to motor control module according to triac signal, which can significantly reduce development cost and improve control efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control, and particularly relates to a safety state control device and control method for an automobile driving motor. BACKGROUND

[0002] The core three components of an electric vehicle are commonly known as the three-electricity system, namely, an electric motor system, a power battery system and an electric control system; among them, the motor controller as a member of the three-electricity system is a core component of the power system of the electric vehicle. Specifically, the motor controller, also known as an inverter, converts the direct current of the high-voltage battery of the electric vehicle into three-phase alternating current to drive the motor, and drives the vehicle to run by controlling the output torque of the motor.

[0003] The motor controller, as the main control unit of the motor control system, completes the torque control and other functions of the motor. According to the analysis of the automotive electronic functional safety standard, the electronic / electrical failure of the motor controller will lead to safety risks, and the motor control system needs to enter a safe state to ensure the personal safety of the vehicle passengers. The current industry classifies the safety level of the motor controller into ASIL C or ASIL D, wherein ASIL is (Automotive Safety Integrity Level, automotive safety integrity level). Specifically, the safety state of the motor controller has the following several kinds:

[0004] 1) 0 torque output: when the CAN communication of the motor control system fails;

[0005] 2) Three-phase open circuit (Safety Pulse Off, SPO): when the motor control system generates a control failure, and the motor speed is at a low speed;

[0006] 3) Active short circuit (Active Short Circuit, ASC): when the motor control system generates a control failure, and the motor speed is at a high speed.

[0007] The implementation mode of the above-described three-phase open circuit (referred to as SPO mode) is to turn off all the 6 bridge arms in the motor control system (that is, all the insulated gate bipolar transistors IGBT are turned off, wherein IGBT is the full name of Insulated Gate Bipolar Transistor), and the implementation mode of the active short circuit (referred to as ASC mode) is to turn on all the upper bridge arms and turn off all the lower bridge arms in the motor control system (referred to as upper bridge arm ASC mode) or turn on all the lower bridge arms and turn off all the upper bridge arms (referred to as lower bridge arm ASC mode).

[0008] According to the above description of the safety state, the motor speed is also an important signal after the failure of the motor control system. The system needs to control the motor to enter the ASC mode when the motor speed is high and to enter the SPO mode when the motor speed is low. However, in the current design, after the failure of the processor (Microcontroller Unit, MCU) or the power supply of the MCU, the system cannot reliably obtain the motor speed signal and can only directly enter the lower bridge arm ASC mode.

[0009] To solve the above problems, the related technology adopts a master processor and a slave processor independent of each other. After the failure of the power module or the master processor, the slave processor obtains the motor speed through a line voltage zero-crossing detection circuit or a phase current zero-crossing detection circuit, and then controls the system to enter the SPO mode or the ASC mode according to the motor speed. However, this type of solution needs to additionally add a slave processor to obtain the motor speed, which not only increases the product cost but also increases the software development difficulty, resulting in poor efficiency of motor safety state control. SUMMARY

[0010] Therefore, the present application provides an automobile driving motor safety state control device and control method to solve the problems of high cost, difficult development, and low efficiency of the existing motor safety state control in the above technical background, which seriously affects user safety.

[0011] In a first aspect, the present application provides an automobile driving motor safety state control device, which comprises:

[0012] a power supply chip, a processor, a motor speed acquisition module, a switching module, an ASC logic module, and a motor control module. One side of the switching module is connected to the power supply chip, the processor, and the motor speed acquisition module, and the other side is connected to the ASC logic module. The ASC logic module is connected to the motor control module.

[0013] The motor speed acquisition module outputs a first control signal to the switching module based on the received first safety state control signal and / or second safety state control signal and in combination with a preset reference voltage, wherein the first safety state control signal is generated after the failure of the power supply chip, and the second safety state control signal is generated after the failure of the processor.

[0014] The switching module determines a selection signal output to the ASC logic module from the first safety state control signal, the second safety state control signal, and the first control signal according to the first control signal, so that the ASC logic module performs corresponding safety state control on the motor control module according to the selection signal.

[0015] The automobile driving motor safety state control device provided by the application can obtain the first control signal output by the motor speed acquisition module after the power supply chip and / or the processor fail, so that the switch module performs the gating processing of the corresponding signal, and then the ASC logic module controls the motor control module according to the gating signal output by the switch module, which can significantly reduce the development cost of the motor safety state control, improve the control efficiency of the motor safety state, further ensure the stable operation of the whole vehicle, and meet the safety driving demand of the user.

[0016] In an optional embodiment, the motor speed acquisition module comprises a voltage signal to frequency signal unit, a resolver excitation signal generation unit, a motor resolver sensor and a frequency signal to voltage signal unit connected in sequence.

[0017] The voltage signal to frequency signal unit is connected to the power supply chip and the processor respectively, and is used to determine the pulse width modulation signal according to the preset threshold voltage after receiving the first safety state control signal and / or the second safety state control signal, and output the pulse width modulation signal to the resolver excitation signal generation unit.

[0018] The resolver excitation signal generation unit converts the pulse width modulation signal into the corresponding excitation signal, and outputs the excitation signal to the motor resolver sensor.

[0019] The motor resolver sensor is used to acquire the state data of the motor rotor, output the sine signal and the cosine signal according to the state data and the excitation signal, and transmit the sine signal or the cosine signal to the frequency signal to voltage signal unit.

[0020] The frequency signal to voltage signal unit is connected to the power supply chip and the processor respectively, and is used to generate the inhibition signal after receiving the first safety state control signal and / or the second safety state control signal, and obtain the corresponding frequency signal after envelope detection of the sine signal or the cosine signal, convert the frequency signal into the voltage signal, generate the third safety state control signal based on the size relationship between the voltage signal and the preset reference voltage, and generate the first control signal based on the inhibition signal and the third safety state control signal.

[0021] The motor speed acquisition module comprising the voltage signal to frequency signal unit, the resolver excitation signal generation unit, the motor resolver sensor and the frequency signal to voltage signal unit is designed to correspondingly acquire the motor speed, that is, the voltage value corresponding to the frequency signal obtained after envelope detection of the sine signal or the cosine signal generated by the motor resolver sensor is substantially acquired, and the speed of the motor is determined based on the proportional relationship between the voltage and the speed, which can simplify the control process of the motor safety state, and further improve the control efficiency of the motor safety state.

[0022] In an alternative embodiment, when the first control signal contains the inhibit signal, the gate signal of the switch module is the third safe state control signal;

[0023] When the first control signal does not contain the inhibit signal, the gate signal of the switch module is the first safe state control signal and / or the second safe state control signal.

[0024] The application determines the gate signal of the switch module by whether the first control signal output by the motor speed acquisition module contains the inhibit signal, and can realize flexible control of the safe state of the motor under different operating conditions, greatly reduces the failure rate of the motor control system, and ensures the safe operation of the vehicle.

[0025] In an alternative embodiment, the corresponding safe state control of the motor control module by the ASC logic module according to the gate signal includes: the ASC logic module outputs the second control signal according to the gate signal, and controls the motor control module according to the corresponding safe state based on the second control signal, and the second control signal includes the high-level signal and the low-level signal.

[0026] When the gate signal is the first safe state control signal and / or the second safe state control signal, the second control signal is the low-level signal; when the gate signal is the third safe state control signal, if the third safe state control signal is the high-level signal, the second control signal is the high-level signal; if the third safe state control signal is the low-level signal, the second control signal is the low-level signal; when the voltage signal is greater than the preset reference voltage, the third safe state control signal is the high-level signal, and when the voltage signal is not greater than the preset reference voltage, the third safe state control signal is the low-level signal.

[0027] The application can ensure the accuracy of the safe state control of the motor by designing the double control signal output process of outputting the gate signal according to the first control signal, further outputting the second control signal according to the gate signal, and controlling the safe state of the motor control module based on the second control signal.

[0028] In an alternative embodiment, the motor control module includes a driving circuit unit, a three-phase bridge unit and a motor connected in sequence.

[0029] The driving circuit unit includes a lower bridge arm driving circuit and an upper bridge arm driving circuit, and is used for outputting corresponding driving signals according to the second control signal of the ASC logic module, so as to drive the lower bridge arm driving circuit and / or the upper bridge arm driving circuit to work.

[0030] The three-phase bridge unit comprises a lower bridge arm power module and an upper bridge arm power module, and is used for corresponding operation according to the working state of the lower bridge arm driving circuit and / or the upper bridge arm driving circuit, and outputs three-phase alternating current to control the motor to perform corresponding safety state control; wherein, when the second control signal is a high-level signal, the motor is controlled to enter the lower bridge arm ASC mode; and when the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

[0031] The motor control module comprising the driving circuit unit, the three-phase bridge unit and the motor is designed to complete the safety state control of the motor, that is, the motor safety state is flexibly, conveniently and efficiently controlled according to the second control signal output by the ASC logic module.

[0032] In an optional embodiment, the automobile driving motor safety state control device further comprises an external power supply and a backup power supply, the external power supply comprises a high-voltage battery and a low-voltage battery, and the backup power supply comprises a high-voltage power taking circuit and a direct current conversion circuit.

[0033] The low-voltage battery is connected with the first preset diode and used to supply power to the power supply chip and the direct current conversion circuit; one side of the high-voltage power taking circuit is connected with the high-voltage battery and used to obtain electric energy; the other side of the high-voltage power taking circuit comprises two power supplies, one of which is connected with the second preset diode and used to supply power to the power supply chip and the direct current conversion circuit in the case that the low-voltage battery fails; and the other power supply is connected with the third preset diode and used to supply power to the switch module, the ASC logic module, the motor control module, the voltage signal to frequency signal unit, the resolver excitation signal generation unit and the frequency signal to voltage signal unit in the case that the direct current conversion circuit fails.

[0034] The external power supply comprising the high-voltage battery and the low-voltage battery and the backup power supply comprising the high-voltage power taking circuit and the direct current conversion circuit are designed, so that the continuous operation of the automobile driving motor safety state control device can be ensured under different vehicle working conditions, and the reliable control of the motor safety state is ensured.

[0035] In the second aspect, the application provides an automobile driving motor safety state control method applied to the automobile driving motor safety state control device in the first aspect or any of the optional embodiments thereof, and the method comprises the following steps.

[0036] The motor speed acquisition module outputs the first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal and in combination with the preset reference voltage, wherein the first safety state control signal is generated after the power supply chip fails, and the second safety state control signal is generated after the processor fails.

[0037] The switch module determines a gate signal from among the first safety state control signal, the second safety state control signal and the first control signal according to the first control signal and outputs the gate signal to the ASC logic module;

[0038] The ASC logic module outputs a second control signal based on the gate signal and controls the motor control module based on the second control signal.

[0039] The motor safety state control method of the automobile provided by the application realizes effective control of the motor safety state under the failure condition of the power supply chip and / or the processor, improves the control efficiency of the motor safety state, reduces the development cost of the motor safety state control, guarantees the safe, reliable and stable operation of the whole vehicle and greatly meets the safety driving demand of the user.

[0040] In an alternative embodiment, the motor speed acquisition module outputs the first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal and in combination with a preset reference voltage, including:

[0041] The voltage signal to frequency signal unit determines a pulse width modulation signal according to a preset threshold voltage after receiving the first safety state control signal and / or the second safety state control signal and outputs the pulse width modulation signal to the resolver excitation signal generation unit;

[0042] The resolver excitation signal generation unit converts the pulse width modulation signal into a corresponding excitation signal and outputs the excitation signal to the motor resolver sensor;

[0043] The motor resolver sensor acquires state data of a motor rotor, outputs a sine signal and a cosine signal according to the state data and the excitation signal and transmits the sine signal or the cosine signal to the frequency signal to voltage signal unit;

[0044] The frequency signal to voltage signal unit generates a prohibition signal after receiving the first safety state control signal and / or the second safety state control signal, obtains a corresponding frequency signal after envelope detection of the sine signal or the cosine signal, converts the frequency signal into a voltage signal, generates a third safety state control signal based on the size relationship between the voltage signal and a preset reference voltage and generates the first control signal based on the prohibition signal and the third safety state control signal.

[0045] The application generates the corresponding voltage value of the frequency signal after the envelope detection of the sine signal or the cosine signal generated by the motor resolver sensor through the voltage signal to frequency signal unit, the resolver excitation signal generation unit, the motor resolver sensor and the frequency signal to voltage signal unit, and determines the motor speed condition based on the proportional relationship between the voltage and the speed, which can greatly simplify the control process of the motor safety state and further improve the control efficiency of the motor safety state.

[0046] In an optional embodiment, the third safety state control signal is generated based on the size relationship between the voltage signal and the preset reference voltage, comprising:

[0047] When the voltage signal is greater than the preset reference voltage, the third safety state control signal is determined as a high level signal;

[0048] When the voltage signal is not greater than the preset reference voltage, the third safety state control signal is determined as a low level signal.

[0049] The application identifies the third safety state control signal through the size relationship between the voltage signal and the preset reference voltage, which can realize the simple determination of the third safety state control signal and further simplify the acquisition of the motor speed.

[0050] In an optional embodiment, the ASC logic module outputs the second control signal based on the gating signal, comprising:

[0051] Detecting whether the first control signal contains a prohibition signal;

[0052] When the first control signal contains the prohibition signal, the gating signal of the switch module is determined as the third safety state control signal; if the third safety state control signal is a high level signal, the second control signal is a high level signal; if the third safety state control signal is a low level signal, the second control signal is a low level signal.

[0053] The application determines the gating signal and the second control signal of the switch module through whether the first control signal output by the motor speed acquisition module contains the prohibition signal, which can guarantee the accuracy of signal identification, realize the flexible control of the motor safety state under different operating conditions, reduce the failure rate of the motor control system, and further guarantee the safe operation of the whole vehicle.

[0054] In an optional embodiment, the automobile driving motor safety state control method further comprises:

[0055] When the first control signal does not contain the prohibition signal, the gating signal of the switch module is determined as the first safety state control signal and / or the second safety state control signal, and the second control signal is determined as a low level signal.

[0056] The application can ensure the reliable operation of the automobile driving motor safety state control device under different working conditions, and further ensure the safe operation of the whole vehicle.

[0057] In an alternative embodiment, the motor control module is controlled according to the second control signal, comprising:

[0058] When the second control signal is a high-level signal, the motor is controlled to enter the lower bridge arm ASC mode;

[0059] When the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

[0060] The application can realize flexible and efficient control of the motor safety state according to the proportional relationship between the voltage and the speed, and the second control signal is designed to control the motor to enter the lower bridge arm ASC mode when the second control signal is a high-level signal, and to control the motor to enter the SPO mode when the second control signal is a low-level signal.

[0061] The automobile driving motor safety state control device and the control method can output the first control signal from the motor speed acquisition module to the ASC logic module, so that the switch module determines the selection signal output to the ASC logic module among the first safety state control signal, the second safety state control signal and the third safety state control signal, and then the ASC logic module controls the motor control module according to the selection signal, which can effectively control the motor safety state under the failure conditions of the power chip and / or the processor, significantly reduce the development cost of the motor safety state control, improve the control efficiency of the motor safety state, ensure the safe, reliable and stable operation of the whole vehicle, and greatly meet the safety driving needs of users. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0063] Figure 1 is a structural schematic diagram of an automobile driving motor safety state control device according to an embodiment of the application;

[0064] Figure 2 is a structural schematic diagram of another automobile driving motor safety state control device according to an embodiment of the application;

[0065] Figure 3 This is a schematic diagram of the circuit structure of a safety state control device for a vehicle drive motor;

[0066] Figure 4 is a flow chart of a method for controlling a safe state of a vehicle drive motor according to an embodiment of the present invention;

[0067] Figure 5 is a flow chart of another method for controlling a safe state of a vehicle drive motor according to an embodiment of the present invention;

[0068] Figure 6 It is a logical diagram of the safety state control process of the automobile drive motor. DETAILED DESCRIPTION

[0069] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0070] In this embodiment, a vehicle drive motor safety state control device is provided. Figure 1 FIG. 1 is a schematic diagram of a structure of a vehicle drive motor safety state control device according to an embodiment of the present invention. Figure 1 As shown, the device includes: a power chip 1, a processor 2, a motor speed acquisition module 3, a switch module 4, an ASC logic module 5 and a motor control module 6; wherein, one side of the switch module 4 is connected to the power chip 1, the processor 2 and the motor speed acquisition module 3 respectively, and the other side is connected to the ASC logic module 5; the ASC logic module 5 is connected to the motor control module 6; the motor speed acquisition module 3 outputs a first control signal to the switch module 4 based on the received first safety state control signal and / or the second safety state control signal and in combination with a preset reference voltage, wherein the first safety state control signal is generated correspondingly after the power chip 1 fails, and the second safety state control signal is generated correspondingly after the processor 2 fails; the switch module 4 determines the selection signal from the first safety state control signal, the second safety state control signal and the first control signal according to the first control signal and outputs it to the ASC logic module 5, so that the ASC logic module 5 performs corresponding safety state control on the motor control module 6 according to the selection signal.

[0071] It should be noted that for the motor control system, the power supply chip is also called a power management chip (Power Management Integrated Circuits, PMIC), which is responsible for converting the power supply voltage and current into the power supply required by the motor, and providing the necessary control signals to ensure the stable operation of the motor. The processor is also called a microcontroller unit (Microcontroller Unit, MCU), which is not only responsible for the precise control of the motor, but also processes various input signals, performs fault diagnosis, and realizes the functions of power conversion and management. In the present embodiment, the specific functions and models of the power supply chip 1 and the processor 2 are not limited here and can be adjusted as needed.

[0072] In the present embodiment, the motor speed acquisition module 3 is used to acquire the motor speed, and then control the motor to enter the corresponding safe state according to the current speed. In actual application, after the MCU or the power supply (such as PMIC) of the MCU fails, the motor control system cannot acquire reliable motor speed signals, and the prior art directly controls the motor to enter the lower bridge arm ASC mode (i.e. the lower bridge arm full conduction and upper bridge arm full off state) to realize the safe state control of the motor. However, according to the relationship between the motor speed and the torque, when the motor appears low voltage power failure or the processor / power module cannot work and needs to perform a safety protection operation, if the motor is directly controlled to enter the SPO mode or the ASC mode, an unpredictable large reverse torque will be caused, so the ASC mode is needed to actively short-circuit when the motor speed is high, and the SPO mode is needed to safely turn off the gate (i.e. all bridge arms are fully off) when the motor speed is low. It should be noted that the motor speed acquisition module 3 in the present embodiment generates a corresponding voltage value by acquiring the frequency signal after envelope detection of the sine signal or cosine signal generated by the motor rotary variable sensor, and determines the motor speed condition based on the proportional relationship between the voltage and the speed. By designing the related circuit of the motor speed acquisition module 3, the accurate motor speed can be acquired, which greatly simplifies the control process of the motor safe state.

[0073] The automobile drive motor safe state control device of the present embodiment can output a first control signal from the motor speed acquisition module to make the switching module perform gating processing of the corresponding signal after the power supply chip and / or the processor fail, and then make the ASC logic module perform corresponding safe state control on the motor control module according to the gating signal output by the switching module, which can significantly reduce the development cost of the motor safe state control, greatly improve the control efficiency of the motor safe state, not only ensure the stable operation of the vehicle, but also meet the safety driving needs of the user.

[0074] In a specific embodiment, Figure 2 is a structure diagram of another automobile drive motor safe state control device according to the present embodiment.Figure 2 It can be known that the motor speed acquisition module 3 comprises a voltage signal to frequency signal unit 31, a resolver excitation signal generation unit 32, a motor resolver sensor 33 and a frequency signal to voltage signal unit 34 connected in sequence; wherein the voltage signal to frequency signal unit 31 is connected with the power supply chip 1 and the processor 2 respectively, for determining a pulse width modulation signal according to a preset threshold voltage after receiving the first safety state control signal and / or the second safety state control signal, and outputting the pulse width modulation signal to the resolver excitation signal generation unit 32; the resolver excitation signal generation unit 32 converts the pulse width modulation signal into a corresponding excitation signal, and outputs the excitation signal to the motor resolver sensor 33; the motor resolver sensor 33 is used for acquiring state data of a motor rotor, outputting a sine signal and a cosine signal according to the state data and the excitation signal, and transmitting the sine signal or the cosine signal to the frequency signal to voltage signal unit 34; the frequency signal to voltage signal unit 34 is connected with the power supply chip 1 and the processor 2 respectively, for generating a prohibition signal after receiving the first safety state control signal and / or the second safety state control signal, and obtaining a corresponding frequency signal after envelope detection of the sine signal or the cosine signal, converting the frequency signal into a voltage signal, generating a third safety state control signal based on the size relationship between the voltage signal and a preset reference voltage, and generating the first control signal based on the prohibition signal and the third safety state control signal.

[0075] In the embodiment, the specific values of the preset threshold voltage and the preset reference voltage are not limited here, and are adaptively adjusted based on the actual circuit design requirements. For example, for the preset threshold voltage, the specific value is related to the resolver sensor and the circuit parameters, and needs to be calibrated according to the actual circuit design and the selected sensor, i.e. calculated according to the excitation signal frequency designed by the resolver sensor and the circuit parameters of the voltage signal to frequency signal unit 31, such as the preset threshold voltage of 2.5V, which is only exemplary.

[0076] It should be noted that the pulse width modulation signal is also called pulse width modulation signal (PWM), which is mainly used for controlling components in a circuit, such as a motor, by adjusting the duty cycle (i.e. the ratio of pulse width to period) of the pulse to change the output voltage or current, so as to achieve precise control of the circuit. The motor resolver sensor is also called a resolver, which is a kind of position sensor. Its working principle is that the resolver sensor inputs a high-frequency sine signal (excitation signal) to the rotor coil, receives the high-frequency induced signal in the coil, obtains the sine and cosine information after processing, and obtains the absolute position of the motor after software analysis. Specifically, the motor resolver sensor detects and feeds back the rotor position and speed of the motor, which can effectively help the control system to acquire the state signal of the motor, so as to realize precise control and monitoring of the running state of the motor.

[0077] In the embodiment, the main function of the motor rotary variable sensor is to monitor the rotating speed, position and rotating direction of the motor, and feed back the information to the motor controller, and the motor controller can accurately control the speed and rotating direction of the motor through the feedback information, that is, the frequency and sequence of the three-phase alternating current can be controlled, so as to change the rotating speed and rotating direction of the motor.

[0078] It should be noted that the specific composition of the motor rotating speed acquisition module 3 in the embodiment can be adaptively adjusted according to the circuit design requirements, for example, a rotary variable signal conditioning unit for conditioning the sine signal and the cosine signal output by the motor rotary variable sensor is added.

[0079] In the embodiment, the motor rotating speed acquisition module comprising a voltage signal to frequency signal unit, a rotary variable excitation signal generation unit, a motor rotary variable sensor and a frequency signal to voltage signal unit is designed to correspondingly acquire the frequency signal after envelope detection of the sine signal or the cosine signal generated by the motor rotary variable sensor to generate the corresponding voltage value, and the rotating speed of the motor is determined based on the proportional relationship between the voltage and the rotating speed, which can simplify the control process of the safety state of the motor, and further improve the control efficiency of the safety state of the motor.

[0080] It should be noted that the determination of the strobe signal in the switch module 4 of the embodiment is substantially related to the existence of the inhibit signal, that is, the existence of the inhibit signal indicates that the motor rotating speed acquisition module 3 is in a working state, at this time, the power supply chip 1 and / or the processor 2 are in a failure state, and the safety state of the motor is only controlled by the third safety state control signal output by the motor rotating speed acquisition module 3. Specifically, when the first control signal contains the inhibit signal, the strobe signal of the switch module is the third safety state control signal; when the first control signal does not contain the inhibit signal, the strobe signal of the switch module is the first safety state control signal and / or the second safety state control signal.

[0081] In the embodiment, the strobe signal of the switch module is determined by whether the first control signal output by the motor rotating speed acquisition module contains the inhibit signal, which can realize flexible control of the safety state of the motor under different operating conditions, greatly reduces the failure rate of the motor control system, and ensures the safe operation of the whole vehicle.

[0082] It should be noted that the ASC logic module 5 in this embodiment mainly outputs corresponding logic control signals (i.e., second control signals) according to the type of safety state control signals (i.e., selection signals). Specifically, the corresponding safety state control of the motor control module 6 by the ASC logic module 5 according to the selection signal includes: the ASC logic module 5 outputs the second control signal corresponding to the selection signal, and controls the motor control module 6 according to the second control signal, the second control signal including a high-level signal and a low-level signal; wherein, when the selection signal is the first safety state control signal and / or the second safety state control signal, the second control signal is a low-level signal; when the selection signal is the third safety state control signal, if the third safety state control signal is a high-level signal, the second control signal is a high-level signal; if the third safety state control signal is a low-level signal, the second control signal is a low-level signal; when the voltage signal is greater than the preset reference voltage, the third safety state control signal is a high-level signal, and when the voltage signal is not greater than the preset reference voltage, the third safety state control signal is a low-level signal.

[0083] In the embodiment of the application, by designing a double control signal output process of outputting a selection signal according to a first control signal, further outputting a second control signal according to the selection signal and controlling the safety state of the motor control module based on the second control signal, the accuracy of the safety state control of the motor can be ensured.

[0084] In a specific embodiment, Figure 2 is a structural schematic diagram of another automobile driving motor safety state control device according to an embodiment of the application. By Figure 2 It can be seen that the motor control module 6 includes a driving circuit unit 61, a three-phase bridge unit 62 and a motor 63 connected in sequence; wherein, the driving circuit unit 61 includes a lower bridge arm driving circuit and an upper bridge arm driving circuit, for outputting corresponding driving signals according to the second control signal of the ASC logic module 5, to drive the lower bridge arm driving circuit and / or the upper bridge arm driving circuit to work; the three-phase bridge unit 62 includes a lower bridge arm power module and an upper bridge arm power module, for corresponding work according to the working state of the lower bridge arm driving circuit and / or the upper bridge arm driving circuit, to output three-phase alternating current to make the motor 63 perform corresponding safety state control; wherein, when the second control signal is a high-level signal, the motor 63 is controlled to enter the lower bridge arm ASC mode; when the second control signal is a low-level signal, the motor 63 is controlled to enter the SPO mode.

[0085] It should be noted that the specific circuit composition of the lower bridge arm driving circuit, the upper bridge arm driving circuit, the lower bridge arm power module and the upper bridge arm power module in this embodiment is not limited here, and can be understood adaptively by referring to the conventional driving circuit and inverter circuit in the art.

[0086] The motor control module comprising the driving circuit unit, the three-phase bridge unit and the motor is designed in the embodiment of the application to complete the safety state control of the motor, that is, the motor control module realizes flexible, convenient and efficient control of the safety state of the motor according to the second control signal output by the ASC logic module.

[0087] In a specific embodiment, Figure 2 is a structural schematic diagram of another automobile driving motor safety state control device according to the embodiment of the application. Figure 2 It can be known that the automobile driving motor safety state control device in the embodiment further comprises an external power supply 7 and a backup power supply 8, the external power supply 7 comprises a high-voltage battery and a low-voltage battery, and the backup power supply comprises a high-voltage power taking circuit and a direct current conversion circuit; wherein the low-voltage battery is connected with a first preset diode and is used to supply power to the power supply chip 1 and the direct current conversion circuit; one side of the high-voltage power taking circuit is connected with the high-voltage battery and is used to obtain electric energy; the other side of the high-voltage power taking circuit comprises two power supplies, one of which is connected with a second preset diode and is used to supply power to the power supply chip 1 and the direct current conversion circuit in the case that the low-voltage battery fails; and the other power supply is connected with a third preset diode and is used to supply power to the switch module 4, the ASC logic module 5, the motor control module 6, the voltage signal to frequency signal unit 31, the resolver excitation signal generation unit 32 and the frequency signal to voltage signal unit 34 in the case that the direct current conversion circuit fails.

[0088] It should be noted that the specific circuit composition of the high-voltage power taking circuit and the direct current conversion circuit in the embodiment is not limited here and can be understood adaptively with reference to the related circuits in the art; the specific model and function of the first preset diode, the second preset diode and the third preset diode in the embodiment are adaptively adjusted according to the actual circuit design requirements.

[0089] In the embodiment of the application, the external power supply comprising the high-voltage battery and the low-voltage battery and the backup power supply comprising the high-voltage power taking circuit and the direct current conversion circuit are designed, so that the continuous operation of the automobile driving motor safety state control device can be ensured under different vehicle working conditions, and the reliable control of the safety state of the motor is further ensured.

[0090] In actual application, after the MCU or PMIC fails, the prior art adds two MCUs to obtain the motor speed and then realize the safe state control of the motor. However, the additional MCU not only increases the cost but also needs to be developed with corresponding software, which seriously affects the control efficiency of the safe state of the motor. Based on this, the motor speed is obtained only through the related circuit design in the embodiment, and then the ASC logic module is controlled according to the speed to control the motor to enter the lower bridge arm ASC mode when the motor is at high speed and to enter the SPO mode when the motor is at low speed. Specifically, the motor speed is obtained and the safe state of the motor is controlled through the design of the voltage signal to frequency signal unit, the frequency signal to voltage signal unit, the electronic switch module, the ASC logic module, the resolver excitation signal generation unit and the motor resolver sensor in the embodiment.

[0091] In a specific embodiment, a safe state control device for an automobile driving motor is provided, Figure 3 is a schematic diagram of the circuit structure of the automobile driving motor safe state control device. It should be noted that the three modules of the external high-voltage battery, the high-power direct-current conversion circuit and the low-voltage battery (it should be noted that the three parts connected externally are other components on the whole vehicle and do not belong to the specific components of the automobile driving motor safe state control device. In order to facilitate understanding, they are drawn in the structural diagram of Figure 3 ). In addition, the specific connection relationship of each component of the device can be known according to the wiring relationship of Figure 3 , which is not described here. As can be seen from Figure 3 , the device comprises:

[0092] a PMIC (power management chip), an MCU (processor), a high-voltage power taking circuit, a direct-current conversion circuit, an upper bridge arm driving power supply, a lower bridge arm driving power supply, a switch module (electronic switch), an ASC logic module (ASC logic), a lower bridge arm driving circuit, an upper bridge arm driving circuit, a lower bridge arm power module, an upper bridge arm power module, a motor, a voltage signal to frequency signal unit, a frequency signal to voltage signal unit, a resolver SIN / COS signal conditioning unit, a resolver excitation signal generation unit and a motor resolver sensor.

[0093] In the embodiment, the PMIC supplies power to the MCU, and when the PMIC fails, a safe state control signal SS1 (i.e. a first safe state control signal, Safe State 1) can be generated and the ASC logic module is controlled by the electronic switch to output a safe state control signal SS (i.e. a second control signal) to the lower bridge arm driving circuit module, and SS1 simultaneously enables the voltage signal to frequency signal unit and the frequency signal to voltage signal unit as an enable signal; the MCU is used for arithmetic processing and outputting the driving signals required by the upper bridge arm and lower bridge arm driving circuit modules (i.e. Figure 3UL / VL / WL and UH / VH / WH in the table. It needs to be explained that the drive signal is usually divided into three phases, each phase has a corresponding independent signal to control the corresponding power switch device, that is, to control the switching state of the U, V and W phases in the motor. The drive signals UL / VL / WL and UH / VH / WH of the embodiment are used to represent different switching states of the three-phase signals, and their specific meanings are adaptively set according to the circuit design requirements, the PWM signal required by the output resolver excitation signal generation unit (i.e. the function of the MCU in normal operation), and the decoding of the sine signal and cosine signal output by the resolver sensor. When the MCU fails, a safety state control signal SS2 (i.e. the second safety state control signal SafeState 2) can be generated and output to the lower bridge arm drive circuit through the electronic switch control ASC logic module, and SS2 also serves as an enable signal to enable the voltage-to-frequency signal conversion unit and the frequency-to-voltage signal conversion unit. It needs to be noted that as long as one of the above-mentioned SS1 and SS2 signals meets the requirements (i.e. generates any one safety state control signal), the voltage-to-frequency signal conversion unit and the frequency-to-voltage signal conversion unit can be enabled.

[0094] In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery. Figure 3 In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery. Figure 3 In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery. Figure 3 In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery. Figure 3 In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery.

[0095] In the embodiment, the high-voltage power taking circuit takes power from the high-voltage battery to make the automobile drive motor safety state control device (referred to as device) still work when the low-voltage battery fails. One power supply of the high-voltage power taking circuit is connected to a diode (i.e. D2 in the table) and then connected to the low-voltage battery.

[0096] In the embodiment, the upper bridge arm driving power supply outputs power supply to power the upper bridge arm driving circuit; the lower bridge arm driving power supply outputs power supply to power the lower bridge arm driving circuit.

[0097] In the embodiment, the electronic switch receives the inhibit signal output by the frequency signal to voltage signal unit, and outputs the safe state control signals SS1 and SS2 to be off; the ASC logic module comprehensively processes the safe state control signals SS1_O, SS2_O and SS3, and finally outputs only one safe state control signal SS (i.e. the second control signal). It should be noted that SS1_O and SS2_O represent the signal states after the safe state control signals SS1 and SS2 are output to be off, and SS3 (Safe State 3) is the third safe state control signal.

[0098] In the embodiment, the lower bridge arm driving circuit outputs a driving signal to drive the lower bridge arm power module; the upper bridge arm driving circuit module outputs a driving signal to drive the upper bridge arm power module; wherein the lower bridge arm power module and the upper bridge arm power module constitute a three-phase bridge, which is used to convert the direct current of the high-voltage battery into three-phase alternating current for output; the motor M converts the electrical energy of the three-phase current into mechanical energy.

[0099] In the embodiment, the voltage signal to frequency signal unit receives signals SS1 and SS2, and outputs the PWM signal required by the resolver excitation signal generation unit according to the built-in threshold voltage (i.e. the preset threshold voltage, also known as the preset voltage, such as 2.5V). The resolver excitation signal generation unit converts the input PWM signal into the excitation signal required by the motor resolver sensor (i.e. EXC in Figure 3 ); the motor resolver sensor outputs a sine signal (i.e. SIN in Figure 3 ) and a cosine signal (i.e. COS in Figure 3 ) according to the input excitation signal and the rotation of the motor rotor. The resolver SIN / COS signal conditioning unit performs signal conditioning on the sine signal and the cosine signal output by the motor resolver sensor, and then outputs the conditioned signals to the MCU for processing. The frequency signal to voltage signal unit receives signals SS1 and SS2, performs envelope detection on the sine signal output by the motor resolver sensor (it should be noted that only the signal processing flow of the sine signal SIN is drawn in Figure 4 , if the same processing is required for the cosine signal COS, the cosine signal COS needs to be output to the frequency signal to voltage signal unit), and then generates the corresponding safe state control signal SS3 (i.e. the third safe state control signal) according to the envelope-detected frequency signal and outputs it to the ASC logic module. At the same time, the frequency signal to voltage signal unit outputs an inhibit signal to the electronic switch after working to inhibit the control effect of the SS1 and SS2 signals on the ASC logic module.

[0100] It should be noted that, in the embodiment, since the circuit is designed to be proportional to the speed signal and the frequency signal, and the frequency signal is also proportional to the output voltage signal, high speed will correspond to a higher voltage, and low speed will correspond to a lower voltage; finally, a suitable voltage threshold (i.e. a preset reference voltage) is selected for the voltage value output by the frequency signal to voltage signal unit, and the size relationship between the voltage signal and the preset reference voltage is used to distinguish the high speed and the low speed of the motor, specifically, in the frequency signal to voltage signal unit, the output voltage value is compared by the voltage comparator and a safety state control signal SS3 (i.e. a third safety state control signal) is output according to the comparison result, the signal SS3 controls the ASC logic to output a safety state control signal SS (i.e. a second control signal), and the signal SS controls the lower bridge arm drive circuit to enter the lower bridge arm ASC mode when the motor is at high speed and to enter the SPO mode when the motor is at low speed.

[0101] In the embodiment, when the motor control system is in normal operation, accurate motor speed signal is required, but when the MCU or PMIC fails, the motor control system enters the safety state, and accurate speed signal is not required, only to know whether the current motor is in high speed state or low speed state, the embodiment judges the motor speed by designing the voltage signal to frequency signal unit, the frequency signal to voltage signal unit, the electronic switch, the ASC logic module, the resolver excitation signal generation unit and the motor resolver sensor, and enters the ASC mode when the motor is at high speed and enters the SPO mode when the motor is at low speed.

[0102] The embodiment of the application also provides an automobile driving motor safety state control method embodiment, it should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from here.

[0103] In the embodiment, an automobile driving motor safety state control method is provided, which is applied to an automobile driving motor safety state control method device, Figure 4 is a flowchart of the automobile driving motor safety state control method according to the embodiment of the application, as Figure 5 shown, the flowchart includes the following steps:

[0104] In step S401, the motor speed acquisition module outputs a first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal and in combination with a preset reference voltage, wherein the first safety state control signal is generated after the power supply chip fails, and the second safety state control signal is generated after the processor fails.

[0105] Step S402, the switch module determines the gate signal output to the ASC logic module among the first safety state control signal, the second safety state control signal and the first control signal according to the first control signal.

[0106] Step S403, the ASC logic module outputs the second control signal based on the gate signal, and controls the motor control module based on the second control signal.

[0107] It should be noted that the related content of the power supply chip, the processor, the motor speed acquisition module, the ASC logic module and the motor control module in the embodiment is described above, and is not repeated here.

[0108] The automobile driving motor safety state control method provided in the embodiment can realize effective control of the motor safety state under the failure condition of the power supply chip and / or the processor, can improve the control efficiency of the motor safety state, can reduce the development cost of the motor safety state control, can guarantee the safe, reliable and stable operation of the whole vehicle, and greatly meets the safety driving demand of the user.

[0109] In the embodiment, an automobile driving motor safety state control method is provided, which is applied to an automobile driving motor safety state control method device, Figure 5 is a flowchart of another automobile driving motor safety state control method according to the embodiment of the application, as shown in the figure, the flowchart includes the following steps: Figure 4

[0110] Step S501, the motor speed acquisition module outputs the first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal and in combination with the preset reference voltage, wherein the first safety state control signal is generated after the power supply chip fails, and the second safety state control signal is generated after the processor fails.

[0111] Specifically, the motor speed acquisition module outputs the first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal and in combination with the preset reference voltage in step S501 includes:

[0112] Step S5011, after receiving the first safety state control signal and / or the second safety state control signal, the voltage signal to frequency signal unit determines the pulse width modulation signal according to the preset threshold voltage, and outputs the pulse width modulation signal to the resolver excitation signal generation unit.

[0113] ​In step S5012, the resolver excitation signal generation unit converts the pulse width modulation signal into a corresponding excitation signal and outputs the excitation signal to the motor resolver sensor.

[0114] In step S5013, the motor resolver sensor acquires state data of the motor rotor, outputs a sine signal and a cosine signal according to the state data and the excitation signal, and transmits the sine signal or the cosine signal to the frequency signal to voltage signal unit.

[0115] In step S5014, the frequency signal to voltage signal unit generates a prohibition signal after receiving the first safety state control signal and / or the second safety state control signal, performs envelope detection on the sine signal or the cosine signal to obtain a corresponding frequency signal, converts the frequency signal into a voltage signal, generates a third safety state control signal based on the size relationship between the voltage signal and a preset reference voltage, and generates the first control signal based on the prohibition signal and the third safety state control signal.

[0116] In the embodiment, the specific manner of envelope detection on the sine signal or the cosine signal is not limited here and is adaptively set according to the conventional envelope detection manner in the field of digital signal processing. It should be noted that the related content of the preset threshold voltage, the preset reference voltage, the pulse width modulation signal and the motor resolver sensor in the embodiment is described above and will not be repeated here.

[0117] In the embodiment, the generation of the third safety state control signal based on the size relationship between the voltage signal and the preset reference voltage in step S5014 includes:

[0118] In step A1, when the voltage signal is greater than the preset reference voltage, the third safety state control signal is determined to be a high-level signal.

[0119] In step A2, when the voltage signal is not greater than the preset reference voltage, the third safety state control signal is determined to be a low-level signal.

[0120] The embodiment can identify the third safety state control signal through the size relationship between the voltage signal and the preset reference voltage, can realize simple determination of the third safety state control signal, and further simplifies the acquisition of the motor speed.

[0121] In the embodiment, the voltage signal to frequency signal unit, the resolver excitation signal generation unit, the motor resolver sensor and the frequency signal to voltage signal unit are used to generate a corresponding voltage value from the frequency signal obtained by performing envelope detection on the sine signal or the cosine signal generated by the motor resolver sensor, and the speed of the motor is determined based on the proportional relationship between the voltage and the speed, which can greatly simplify the control process of the safety state of the motor and further improve the control efficiency of the safety state of the motor.

[0122] Step S502, the switch module determines the gate signal output to the ASC logic module from the first safety state control signal, the second safety state control signal and the first control signal according to the first control signal. For details, please refer to Figure 3 Step S402 of the embodiment shown will not be repeated here.

[0123] Step S503, the ASC logic module outputs the second control signal based on the gate signal, and controls the motor control module based on the second control signal.

[0124] Specifically, the ASC logic module outputs the second control signal based on the gate signal in step S202 includes:

[0125] Step B1, detecting whether the first control signal contains a prohibition signal.

[0126] In this embodiment, the specific detection method of the prohibition signal is not limited here, which is determined based on the conventional signal detection method in the art.

[0127] Step B2, when the first control signal contains a prohibition signal, the gate signal of the switch module is determined as the third safety state control signal; if the third safety state control signal is a high level signal, the second control signal is a high level signal; if the third safety state control signal is a low level signal, the second control signal is a low level signal.

[0128] In this embodiment, when the first control signal contains a prohibition signal, it indicates that the power chip and / or the processor are invalid and the motor speed acquisition module is in working state, at this time, the first control signal output by the motor speed acquisition module is used to realize the control of the motor safety state.

[0129] Step B3, when the first control signal does not contain a prohibition signal, the gate signal of the switch module is determined as the first safety state control signal and / or the second safety state control signal, and then the second control signal is determined as a low level signal.

[0130] In this embodiment, when the first control signal does not contain a prohibition signal, it indicates that the motor speed acquisition module is invalid, at this time, the first safety state control signal generated after the power chip fails and / or the second safety state control signal generated after the processor fails are needed to identify the second control signal as a low level signal, which can ensure the reliable operation of the automobile driving motor safety state control device under different working conditions, and further ensure the safe operation of the whole vehicle.

[0131] The embodiment of the present application determines the gating signal and the second control signal of the switch module by whether the first control signal output by the motor speed acquisition module contains the prohibition signal, which can guarantee the accuracy of signal identification, realize flexible control of the safety state of the motor under different operating conditions, reduce the failure rate of the motor control system, and further guarantee the safe operation of the whole vehicle.

[0132] In the embodiment, the corresponding safety state control of the motor control module based on the second control signal in the step S503 includes:

[0133] Step C1, when the second control signal is a high-level signal, the motor is controlled to enter the lower bridge arm ASC mode.

[0134] Step C2, when the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

[0135] The embodiment of the present application corresponds to the proportional relationship between voltage and speed to design the second control signal to control the motor to enter the lower bridge arm ASC mode when the second control signal is a high-level signal, and to control the motor to enter the SPO mode when the second control signal is a low-level signal, so that flexible and efficient control of the safety state of the motor can be realized.

[0136] In a specific embodiment, based on Figure 6 the circuit structure principle diagram of the automobile driving motor safety state control device, a corresponding automobile driving motor safety state control process is provided, Figure 6 is a logic diagram of the automobile driving motor safety state control process. As can be seen from ​ , the specific process includes:

[0137] Step D1, after the PMIC fails or the MCU fails, the voltage signal to frequency signal unit and the frequency signal to voltage signal unit are enabled.

[0138] It should be noted that in the embodiment, the voltage signal to frequency signal unit and the frequency signal to voltage signal unit of the motor control system (referred to as system) are in a non-working state when the system is normally operated; after the PMIC fails or the MCU fails, the system first controls the ASC logic to enter the lower bridge arm ASC mode according to the safety state control signal SS1 of the PMIC or the safety state control signal SS2 of the MCU, and this process lasts for a short time, generally only a few milliseconds, which belongs to the category of functional safety.

[0139] In the embodiment, when the PMIC or the MCU fails, the safety state control signal SS1 of the PMIC or the safety state control signal SS2 of the MCU simultaneously functions as an enabling signal, which enables the voltage signal to frequency signal unit and the frequency signal to voltage signal unit, and makes the motor speed acquisition module work (i.e., each component in the motor speed acquisition module works accordingly), and after the frequency signal to voltage signal unit works, the signal of the safety state control signal SS1 and SS2 is inhibited by the electronic switch, so that the ASC logic module only receives the safety state control signal SS3 output by the frequency signal to voltage signal unit for control.

[0140] In step D2, the voltage signal to frequency signal unit generates a frequency signal according to a preset voltage and outputs the frequency signal to the resolver excitation signal generation unit.

[0141] In the embodiment, after the voltage signal to frequency signal unit works, a required frequency signal is generated according to an internal preset voltage, and the frequency signal is output to the resolver excitation signal generation unit.

[0142] In step D3, the resolver excitation signal generation unit outputs an excitation signal to the motor resolver sensor.

[0143] In step D4, the frequency signal to voltage signal unit first performs envelope detection on the SIN signal or the COS signal output by the resolver sensor, then generates a voltage value according to the detected frequency signal, and outputs the safety state control signal SS3 through the voltage comparator.

[0144] In the embodiment, a special chip is used in the resolver excitation signal generation unit to generate a voltage value corresponding to a frequency signal, and the specific model of the special chip can be adaptively determined according to actual requirements.

[0145] In step D5, the SS3 outputs the safety state control signal SS through the ASC logic module to control the lower bridge arm drive circuit module to enter the ASC mode when the motor rotates at a high speed, and to enter the SPO mode when the motor rotates at a low speed.

[0146] In summary, the safety state control method of the automobile driving motor can improve the control efficiency of the safety state of the motor, reduce the development cost of the safety state control of the motor, ensure the safe, reliable and stable operation of the whole vehicle, and greatly meet the safety driving demand of the user.

[0147] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A vehicle drive motor safety state control device, characterized in that: The device comprises: A power supply chip, a processor, a motor speed acquisition module, a switch module, an ASC logic module, and a motor control module; wherein one side of the switch module is connected to the power supply chip, the processor, and the motor speed acquisition module, respectively, and the other side is connected to the ASC logic module; the ASC logic module is connected to the motor control module; The motor speed acquisition module outputs a first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal in combination with a preset reference voltage, wherein the first safety state control signal is generated in response to a failure of the power chip, and the second safety state control signal is generated in response to a failure of the processor; The switch module determines a strobe signal from the first safety state control signal, the second safety state control signal, and the first control signal according to the first control signal and outputs the strobe signal to the ASC logic module, so that the ASC logic module performs corresponding safety state control on the motor control module according to the strobe signal; The motor speed acquisition module includes a voltage signal to frequency signal unit, a resolver excitation signal generation unit, a motor resolver sensor, and a frequency signal to voltage signal unit connected in sequence; wherein the voltage signal to frequency signal unit is respectively connected to the power supply chip and the processor, and is used to determine a pulse width modulation signal according to a preset threshold voltage after receiving the first safety state control signal and / or the second safety state control signal, and output the pulse width modulation signal to the resolver excitation signal generation unit; The resolver excitation signal generating unit converts the pulse width modulation signal into a corresponding excitation signal, and outputs the excitation signal to the motor resolver sensor; The motor resolver sensor is used to obtain state data of the motor rotor, output a sine signal and a cosine signal according to the state data and the excitation signal, and transmit the sine signal or the cosine signal to the frequency signal to voltage signal conversion unit; The frequency signal conversion unit is connected to the power supply chip and the processor, respectively, and is configured to generate a prohibition signal after receiving the first safety state control signal and / or the second safety state control signal, and obtain a corresponding frequency signal after performing envelope detection on the sine signal or the cosine signal, convert the frequency signal into a voltage signal accordingly, generate a third safety state control signal based on a magnitude relationship between the voltage signal and a preset reference voltage, and generate a first control signal based on the prohibition signal and the third safety state control signal; When the first control signal includes a prohibition signal, the selection signal of the switch module is a third safety state control signal; When the first control signal does not include a prohibition signal, the selection signal of the switch module is the first safety state control signal and / or the second safety state control signal; Among them, the existence of the prohibition signal is used to indicate that the motor speed acquisition module is in a working state. At this time, the power chip and / or the processor is in a failed state, and the safety state of the motor is only controlled accordingly by the third safety state control signal output by the motor speed acquisition module.

2. The vehicle drive motor safety state control device according to claim 1, characterized in that: The ASC logic module performs corresponding safety state control on the motor control module according to the strobe signal, comprising: the ASC logic module outputs a second control signal according to the strobe signal, and performs corresponding safety state control on the motor control module based on the second control signal, wherein the second control signal includes a high level signal and a low level signal; Wherein, when the selection signal is the first safety state control signal and / or the second safety state control signal, the second control signal is a low level signal; when the selection signal is the third safety state control signal, if the third safety state control signal is a high level signal, the second control signal is a high level signal; if the third safety state control signal is a low level signal, the second control signal is a low level signal; when the voltage signal is greater than a preset reference voltage, the third safety state control signal is a high level signal, and when the voltage signal is not greater than the preset reference voltage, the third safety state control signal is a low level signal.

3. The vehicle drive motor safety state control device according to claim 2, characterized in that: The motor control module includes a driving circuit unit, a three-phase bridge unit and a motor connected in sequence; The driving circuit unit includes a lower bridge arm driving circuit and an upper bridge arm driving circuit, and is configured to output a corresponding driving signal according to the second control signal of the ASC logic module to drive the lower bridge arm driving circuit and / or the upper bridge arm driving circuit to operate; The three-phase bridge unit includes a lower arm power module and an upper arm power module, which are used to perform corresponding operations according to the operating status of the lower arm drive circuit and / or the upper arm drive circuit, and output three-phase alternating current to enable the motor to perform corresponding safety state control; wherein, when the second control signal is a high-level signal, the motor is controlled to enter the lower arm ASC mode; when the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

4. The vehicle drive motor safety state control device according to claim 1, characterized in that: The device further comprises: an external power supply and a backup power supply, wherein the external power supply comprises a high-voltage battery and a low-voltage battery, and the backup power supply comprises a high-voltage power supply circuit and a DC conversion circuit; Among them, the low-voltage battery is connected to the first preset diode and is used to power the power chip and the DC conversion circuit; one side of the high-voltage power supply circuit is connected to the high-voltage battery for obtaining electrical energy; the other side of the high-voltage power supply circuit includes two power supplies, one of which is connected to the second preset diode and is used to power the power chip and the DC conversion circuit in the event of failure of the low-voltage battery; the other power supply is connected to the third preset diode and is used to power the switch module, ASC logic module, motor control module, voltage signal to frequency signal unit, rotary transformer excitation signal generation unit and frequency signal to voltage signal unit in the event of failure of the DC conversion circuit.

5. A method for controlling the safe state of a vehicle drive motor, applied to the vehicle drive motor safe state control device according to any one of claims 1 to 4, characterized in that: The method comprises: The motor speed acquisition module outputs a first control signal to the switch module based on the received first safety state control signal and / or second safety state control signal in combination with a preset reference voltage, wherein the first safety state control signal is generated in response to a power chip failure, and the second safety state control signal is generated in response to a processor failure; The switch module determines a strobe signal among the first safety state control signal, the second safety state control signal and the first control signal according to the first control signal and outputs the strobe signal to the ASC logic module; The ASC logic module outputs a second control signal corresponding to the selection signal, and performs corresponding safety state control on the motor control module based on the second control signal.

6. The method for controlling the safe state of a vehicle drive motor according to claim 5, characterized in that: The motor speed acquisition module outputs a first control signal to the switch module based on the received first safety state control signal and / or the second safety state control signal and in combination with a preset reference voltage, including: After receiving the first safety state control signal and / or the second safety state control signal, the voltage signal to frequency signal conversion unit determines a pulse width modulation signal according to a preset threshold voltage, and outputs the pulse width modulation signal to the resolver excitation signal generation unit; The resolver excitation signal generating unit converts the pulse width modulation signal into a corresponding excitation signal, and outputs the excitation signal to the motor resolver sensor; The motor resolver sensor acquires state data of the motor rotor, outputs a sine signal and a cosine signal according to the state data and the excitation signal, and transmits the sine signal or the cosine signal to a frequency signal to voltage signal conversion unit; After receiving the first safety state control signal and / or the second safety state control signal, the frequency signal to voltage signal conversion unit generates a prohibition signal, performs envelope detection on the sine signal or the cosine signal to obtain a corresponding frequency signal, converts the frequency signal into a voltage signal, generates a third safety state control signal based on a magnitude relationship between the voltage signal and a preset reference voltage, and generates a first control signal based on the prohibition signal and the third safety state control signal.

7. The method for controlling the safe state of a vehicle drive motor according to claim 6, wherein: The generating of the third safety state control signal based on the magnitude relationship between the voltage signal and a preset reference voltage includes: When the voltage signal is greater than a preset reference voltage, determining that the third safety state control signal is a high level signal; When the voltage signal is not greater than a preset reference voltage, the third safety state control signal is determined to be a low level signal.

8. The method for controlling the safe state of a vehicle drive motor according to claim 6, wherein: The ASC logic module outputs a second control signal corresponding to the selection signal, including: detecting whether the first control signal includes a prohibition signal; When the prohibition signal is included in the first control signal, the selection signal of the switch module is determined to be the third safety state control signal; if the third safety state control signal is a high level signal, the second control signal is a high level signal; if the third safety state control signal is a low level signal, the second control signal is a low level signal.

9. The method for controlling the safe state of a vehicle drive motor according to claim 8, characterized in that: The method further comprises: When the first control signal does not include the prohibition signal, the selection signal of the switch module is determined to be the first safety state control signal and / or the second safety state control signal, and the second control signal is further determined to be a low level signal.

10. The method for controlling the safe state of a vehicle drive motor according to claim 9, characterized in that: The performing corresponding safety state control on the motor control module based on the second control signal includes: When the second control signal is a high level signal, the motor is controlled to enter the lower arm ASC mode; When the second control signal is a low level signal, the motor is controlled to enter the SPO mode.

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