Automobile driving motor safety state control device and control method

Abstract

The invention relates to the technical field of motor control, and discloses an automobile driving motor safety state control device and method, and the device comprises a power supply chip, a processor, a motor rotating speed obtaining module, a switch module, an ASC logic module, and a motor control module. One side of the switch module is connected with the power supply chip, the processor and the motor rotating speed acquisition module, and the other side of the switch module is connected with the ASC logic module; the ASC logic module is connected with the motor control module; the motor rotating 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 in combination with a preset reference voltage; and the switch module determines a gating 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 gating 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 gating signal, the development cost can be remarkably reduced, and the control efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a safety state control device and a control method for a vehicle drive motor. Background Art

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

[0003] As the main control unit of the motor control system, the motor controller completes functions such as motor torque control. According to the analysis of automotive electronic functional safety standards, it is found that electronic / electrical failure of the motor controller will lead to safety risks. The motor control system needs to enter a safe state to ensure the personal safety of vehicle drivers and passengers. The current industry safety level of motor controllers is divided into ASIL C or ASIL D, where ASIL is (Automotive Safety Integrity Level). Specifically, the safety status of the motor controller is as follows:

[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 fails, the motor speed is at a low speed;

[0006] 3) Active Short Circuit (ASC): When the motor control system fails, the motor speed is at high speed.

[0007] The three-phase open circuit (referred to as SPO mode) described above is implemented by turning off all six bridge arms in the motor control system (that is, all insulated gate bipolar transistors IGBTs are turned off, where IGBT is Insulated Gate Bipolar Transistor), and the active short circuit (referred to as ASC mode) is implemented by turning on the upper bridge arm and turning off the lower bridge arm in the motor control system (referred to as upper bridge arm ASC mode) or turning on the lower bridge arm and turning off the upper bridge arm (referred to as lower bridge arm ASC mode).

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

[0009] To address the above issues, related technologies use independent master and slave processors. When the power module fails or the master processor fails, the slave processor obtains the motor speed through the line voltage zero-crossing detection circuit or the phase current zero-crossing detection circuit, and then the slave processor enters the SPO mode or ASC mode according to the motor speed control system. However, this type of solution requires an additional slave processor to obtain the motor speed, which not only increases product cost, but also increases the difficulty of software development, resulting in poor efficiency in motor safety state control. Summary of the invention

[0010] In view of this, the present invention provides a vehicle drive motor safety state control device and control method to solve the problems of high cost, difficult development, low efficiency and serious impact on user safety in the existing motor safety state control mentioned in the above technical background.

[0011] In a first aspect, the present invention provides a vehicle drive motor safety state control device, the device comprising:

[0012] A power 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 respectively connected to the power 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 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 correspondingly after the power chip fails, and the second safety state control signal is generated correspondingly after the processor fails;

[0014] The switch module determines a 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, so that the ASC logic module performs corresponding safety state control on the motor control module according to the selection signal.

[0015] The automobile drive motor safety state control device of the present invention can, after the power chip and / or processor fails, obtain the first control signal output by the module according to the motor speed so that the switch module performs the gating processing of the corresponding signal, thereby enabling the ASC logic module to perform corresponding safety state control on the motor control module according to the gating signal output by the switch module. This 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 entire vehicle, and at the same time meet the user's safety vehicle use needs.

[0016] In an optional embodiment, 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;

[0017] The voltage signal to frequency signal unit is connected to the power 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 generating unit converts the pulse width modulation signal into a corresponding excitation signal, and outputs the excitation signal to the motor resolver sensor;

[0019] The motor resolver sensor is used to obtain the 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 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 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 envelope detection of the sine signal or the cosine signal, and convert the frequency signal into a voltage signal accordingly, generate a third safety state control signal based on the 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.

[0021] The present invention acquires the motor speed by designing a motor speed acquisition module including a voltage signal to frequency signal unit, a resolver excitation signal generating unit, a motor resolver sensor and a frequency signal to voltage signal unit. That is, what is actually acquired is a frequency signal generated by a sine signal or a cosine signal generated by a motor resolver sensor and subjected to envelope detection, and the motor speed is determined based on the proportional relationship between the voltage and the speed. This can simplify the control process of the motor safety state, thereby improving the control efficiency of the motor safety state.

[0022] In an optional implementation, when the first control signal includes a prohibition signal, the gating signal of the switch module is a third safety state control signal;

[0023] 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.

[0024] The present invention determines the selection signal of the switch module by whether the first control signal output by the motor speed acquisition module contains a prohibition signal, which can realize flexible control of the motor safety state under different operating conditions, greatly reducing the failure rate of the motor control system and ensuring the safe operation of the whole vehicle.

[0025] In an optional implementation, the ASC logic module performs corresponding safety state control on the motor control module according to the strobe signal, including: 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;

[0026] Among them, 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.

[0027] The present invention can ensure the accuracy of motor safety state control by designing a dual 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 motor control module in a safe state based on the second control signal.

[0028] In an optional implementation, 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 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 work;

[0030] The three-phase bridge unit includes a lower bridge arm power module and an upper bridge arm power module, which are used to perform corresponding operations according to the working status of the lower bridge arm drive circuit and / or the upper bridge 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 bridge arm ASC mode; when the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

[0031] The present invention completes the safety state control of the motor by designing a motor control module including a drive circuit unit, a three-phase bridge unit and a motor, that is, the motor control module realizes flexible, convenient and efficient control of the motor safety state according to the second control signal output by the ASC logic module.

[0032] In an optional implementation, the vehicle drive motor safety state control device further includes: an external power supply and a backup power supply, the external power supply includes a high-voltage battery and a low-voltage battery, and the backup power supply includes a high-voltage power supply circuit and a DC conversion circuit;

[0033] 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 when the low-voltage battery fails; 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 when the DC conversion circuit fails.

[0034] The present invention ensures the continuous operation of the automobile drive motor safety state control device under different vehicle operating conditions by designing an external power supply including a high-voltage battery and a low-voltage battery and a backup power supply including a high-voltage power supply circuit and a DC conversion circuit, thereby ensuring reliable control of the motor safety state.

[0035] In a second aspect, the present invention provides a method for controlling a safe state of a vehicle drive motor, which is applied to a device for controlling a safe state of a vehicle drive motor in the first aspect or any corresponding embodiment thereof, and the method comprises:

[0036] 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 correspondingly after the power chip fails, and the second safety state control signal is generated correspondingly after the processor fails;

[0037] The switch module determines a gating 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 it to the ASC logic module;

[0038] 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.

[0039] The automobile drive motor safety state control method of the present invention enables the switch module to perform the gating processing of the corresponding signal according to the first control signal output by the motor speed acquisition module, and then enables the ASC logic module to perform corresponding safety state control on the motor control module according to the gating signal output by the switch module, thereby realizing effective control of the motor safety state under the condition of power chip and / or processor failure, improving the control efficiency of the motor safety state, reducing the development cost of the motor safety state control, ensuring the safe, reliable and stable operation of the whole vehicle, and greatly meeting the user's safety vehicle use needs.

[0040] In an optional implementation, 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:

[0041] 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;

[0042] 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;

[0043] The motor resolver sensor obtains the 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;

[0044] After receiving the first safety state control signal and / or the second safety state control signal, the frequency signal to voltage signal 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 the 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.

[0045] The present invention uses a voltage signal to frequency signal unit, a resolver excitation signal generating unit, a motor resolver sensor and a frequency signal to voltage signal unit to obtain a frequency signal after envelope detection of a sine signal or a cosine signal generated by a motor resolver sensor to generate a corresponding voltage value, and determines the motor speed 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 implementation, generating a third safety state control signal based on a magnitude relationship between the voltage signal and a preset reference voltage includes:

[0047] When the voltage signal is greater than a preset reference voltage, determining that the third safety state control signal is 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 to be a low level signal.

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

[0050] In an optional implementation, the ASC logic module outputs a second control signal corresponding to the selection signal, including:

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

[0052] When the first control signal includes a prohibition 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.

[0053] The present invention determines the selection signal and the second control signal of the switch module by whether the first control signal output by the motor speed acquisition module contains a prohibition signal, which can ensure the accuracy of signal recognition, realize flexible control of the motor safety state under different operating conditions, reduce the failure rate of the motor control system, and thus ensure the safe operation of the whole vehicle.

[0054] In an optional implementation, the vehicle drive motor safety state control method further includes:

[0055] When the first control signal does not include a 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.

[0056] When the first control signal of the present invention does not include a prohibition signal, the second control signal is identified as a low-level signal by correspondingly generating a first safety state control signal after the power chip fails and / or generating a second safety state control signal after the processor fails, thereby ensuring the reliable operation of the automobile drive motor safety state control device under different working conditions, thereby ensuring the safe operation of the entire vehicle.

[0057] In an optional implementation, performing corresponding safety state control on the motor control module based on the second control signal includes:

[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 present invention designs a second control signal corresponding to the proportional relationship between voltage and speed to control the motor to enter the lower bridge arm ASC mode when the signal is high, and to control the motor to enter the SPO mode when the signal is low, thereby realizing flexible and efficient control of the motor safety state.

[0061] The automobile drive motor safety state control device and control method of the present invention obtains the first control signal output by the motor speed acquisition module so that the switch module determines the selection signal from the first safety state control signal, the second safety state control signal and the third safety state control signal and outputs it to the ASC logic module, thereby enabling the ASC logic module to perform corresponding safety state control on the motor control module according to the selection signal, and can effectively control the safety state of the motor under the condition that the power chip and / or the processor fail, significantly reducing the development cost of the motor safety state control, improving the control efficiency of the motor safety state, ensuring the safe, reliable and stable operation of the whole vehicle, and greatly meeting the user's safety vehicle use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0063] Figure 1 is a schematic structural diagram of a vehicle drive motor safety state control device according to an embodiment of the present invention;

[0064] Figure 2 is a schematic structural diagram of another vehicle drive motor safety state control device according to an embodiment of the present invention;

[0065] Figure 3 It 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] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 creative work are 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 Schematic diagram of the 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 respectively connected to the power chip 1, the processor 2 and the motor speed acquisition module 3, 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 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 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 chip is also called the power management chip (Power Management Integrated Circuits, PMIC), which is responsible for converting the power supply voltage and current into the power required by the motor and providing the necessary control signals to ensure the stable operation of the motor. The processor is also called the 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 functions such as conversion and management of electric energy. In this embodiment, the specific functions and models of the power chip 1 and the processor 2 are not limited here, and can be adaptively adjusted according to actual needs.

[0072] In this embodiment, the motor speed acquisition module 3 is used to obtain the motor speed, and then control the motor to enter the corresponding safe state according to the current speed. In practical applications, due to the failure of the MCU or the power supply of the MCU (such as PMIC), the motor control system cannot obtain a reliable motor speed signal. The prior art directly controls the motor to enter the lower bridge arm ASC mode (i.e., the lower bridge arm is fully turned on and the upper bridge arm is fully turned off) to achieve safe state control of the motor. However, according to the relationship between the motor speed and torque, when the motor has a 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, it will cause unexpected excessive reverse torque, so it is necessary to actively short-circuit through the ASC mode when the motor speed is high, and to perform safety shutdown through the SPO mode when the motor speed is low (i.e., all bridge arms are fully turned off). It should be noted that the motor speed acquisition module 3 in this 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 resolver sensor, and determines the motor speed based on the proportional relationship between voltage and speed. The accurate motor speed can be obtained only by designing the relevant circuits of the motor speed acquisition module 3, which greatly simplifies the control process of the motor safety state.

[0073] The automobile drive motor safety state control device of the embodiment of the present invention can, after the power chip and / or processor fails, obtain the first control signal output by the module according to the motor speed so that the switch module can perform the gating processing of the corresponding signal, thereby enabling the ASC logic module to perform corresponding safety state control on the motor control module according to the gating signal output by the switch module. This can significantly reduce the development cost of the motor safety state control and greatly improve the control efficiency of the motor safety state, which not only ensures the stable operation of the entire vehicle, but also meets the user's safety vehicle use needs.

[0074] In a specific embodiment, Figure 2 FIG. 1 is a schematic diagram of the structure of another vehicle drive motor safety state control device according to an embodiment of the present invention. Figure 2 It can be seen that the motor speed acquisition module 3 includes a voltage signal to frequency signal unit 31, a resolver excitation signal generating unit 32, a motor resolver sensor 33 and a frequency signal to voltage signal unit 34 which are connected in sequence; wherein the voltage signal to frequency signal unit 31 is connected to the power chip 1 and the processor 2 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 generating unit 32; the resolver excitation signal generating 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 Used to obtain 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 34; the frequency signal to voltage signal unit 34 is respectively connected to the power supply chip 1 and the processor 2, and is used to generate a prohibition 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 a voltage signal, generate a third safety state control signal based on the magnitude relationship between the voltage signal and the preset reference voltage, and generate a first control signal based on the prohibition signal and the third safety state control signal.

[0075] In this 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, its specific value is related to the resolver sensor and circuit parameters, and needs to be calibrated according to the actual circuit design and the selected sensor, that is, it is calculated according to the excitation signal frequency of the resolver sensor design and the circuit parameters of the voltage signal to frequency signal unit 31. For example, the preset threshold voltage is 2.5V, which is only used as an exemplary description.

[0076] It should be noted that the pulse width modulation signal is also called the pulse width modulation signal (PWM), which is mainly used to control components in the circuit, such as the motor, by adjusting the duty cycle of the pulse (i.e. the ratio of the pulse width to the period) to change the output voltage or current to achieve precise control of the circuit. The motor resolver sensor, also known as the rotary transformer, is a position sensor. Its working principle is as follows: the resolver sensor inputs a high-frequency sinusoidal signal (excitation signal) to the rotor coil, receives the high-frequency induction signal induced 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 can effectively help the control system obtain the motor status signal by detecting and feeding back the motor's rotor position and speed, thereby achieving precise control and monitoring of the motor's operating status.

[0077] In this embodiment, the main function of the motor resolver sensor is to monitor the speed, position and rotation direction of the motor, and to feed back this information to the motor controller. The motor controller can accurately control the speed and direction of the motor through this feedback information, that is, it can control the frequency and sequence of the three-phase alternating current, thereby changing the speed and direction of the drive motor.

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

[0079] In the embodiment of the present invention, a motor speed acquisition module including a voltage signal to frequency signal unit, a resolver excitation signal generating unit, a motor resolver sensor and a frequency signal to voltage signal unit is designed to obtain the frequency signal after envelope detection of the sine signal or cosine signal generated by the motor resolver sensor to generate a corresponding voltage value, 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 thereby improve the control efficiency of the motor safety state.

[0080] It should be noted that the determination of the selection signal in the switch module 4 of the present embodiment is substantially related to the existence of the prohibition signal, that is, the existence of the prohibition signal indicates that the motor speed acquisition module 3 is in a working state, at which time the power chip 1 and / or the processor 2 is in a failed state, and the safety state of the motor is only controlled by the third safety state control signal output by the motor speed acquisition module 3. Specifically, in the present embodiment, when the prohibition signal is included in the first control signal, the selection signal of the switch module is the third safety state control signal; when the prohibition signal is not included in the first control signal, the selection signal of the switch module is the first safety state control signal and / or the second safety state control signal.

[0081] In the embodiment of the present invention, the selection signal of the switch module is determined by whether the first control signal output by the motor speed acquisition module contains a prohibition signal, which can realize flexible control of the motor safety state under different operating conditions, greatly reduce the failure rate of the motor control system, and ensure the safe operation of the whole vehicle.

[0082] It should be noted that in this embodiment, the ASC logic module 5 mainly outputs the corresponding logic control signal (i.e., the second control signal) according to the type of the safety state control signal (i.e., the selection signal). Specifically, the ASC logic module 5 performs corresponding safety state control on the motor control module 6 according to the selection signal, including: the ASC logic module 5 outputs the second control signal according to the selection signal, and performs corresponding safety state control on the motor control module 6 based on the second control signal, and 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 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 present invention, a dual control signal output process is designed to output a selection signal according to a first control signal, further output a second control signal according to the selection signal, and control the motor control module in a safe state based on the second control signal, thereby ensuring the accuracy of the motor safety state control.

[0084] In a specific embodiment, Figure 2 FIG. 1 is a schematic diagram of the structure of another vehicle drive motor safety state control device according to an embodiment of the present invention. Figure 2 It can be seen that the motor control module 6 includes a drive circuit unit 61, a three-phase bridge unit 62 and a motor 63 connected in sequence; wherein the drive circuit unit 61 includes a lower bridge arm drive circuit and an upper bridge arm drive circuit, which is used to output a corresponding drive signal according to the second control signal of the ASC logic module 5 to drive the lower bridge arm drive circuit and / or the upper bridge arm drive circuit to work; the three-phase bridge unit 62 includes a lower bridge arm power module and an upper bridge arm power module, which are used to perform corresponding work according to the working state of the lower bridge arm drive circuit and / or the upper bridge arm drive circuit, and output three-phase alternating current to enable the motor 63 to 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 drive circuit, upper bridge arm drive circuit, lower bridge arm power module and upper bridge arm power module in this embodiment is not limited here, and can be understood by referring to the conventional drive circuit and inverter circuit adaptability in the field.

[0086] In the embodiment of the present invention, the safety state control of the motor is completed by designing a motor control module including a drive circuit unit, a three-phase bridge unit and a motor, that is, the motor control module realizes flexible, convenient and efficient control of the motor safety state according to the second control signal output by the ASC logic module.

[0087] In a specific embodiment, Figure 2 FIG. 1 is a schematic diagram of the structure of another vehicle drive motor safety state control device according to an embodiment of the present invention. Figure 2 It can be seen that the automobile drive motor safety state control device of this embodiment also includes: an external power supply 7 and a backup power supply 8, the external power supply 7 includes a high-voltage battery and a low-voltage battery, and the backup power supply includes a high-voltage power supply circuit and a DC conversion circuit; wherein, the low-voltage battery is connected to the first preset diode and is used to power the power chip 1 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 1 and the DC conversion circuit in the event of a 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 4, the ASC logic module 5, the motor control module 6, the voltage signal to frequency signal unit 31, the rotary transformer excitation signal generation unit 32 and the frequency signal to voltage signal unit 34 in the event of a failure of the DC conversion circuit.

[0088] It should be noted that the specific circuit composition of the high-voltage power supply circuit and the DC conversion circuit in this embodiment is not limited here, and can be understood by referring to the adaptability of relevant circuits in the field; the specific models and functions of the first preset diode, the second preset diode and the third preset diode in this embodiment are adaptively adjusted according to actual circuit design requirements.

[0089] In the embodiment of the present invention, by designing an external power supply including a high-voltage battery and a low-voltage battery and a backup power supply including a high-voltage power supply circuit and a DC conversion circuit, the continuous operation of the automobile drive motor safety state control device can be guaranteed under different vehicle operating conditions, thereby ensuring reliable control of the motor safety state.

[0090] In practical applications, after the MCU or PMIC fails, the prior art adds two MCUs to obtain the motor speed and then realizes the safe state control of the motor. However, the additional MCU not only increases the cost but also requires corresponding software development, which seriously affects the control efficiency of the motor safety state. Based on this, the present embodiment obtains the motor speed only through the relevant circuit design, and then controls the ASC logic module according to the speed to control the motor to enter the lower bridge arm ASC mode when the motor speed is high and to control the motor to enter the SPO mode when the motor speed is low. Specifically, in the present embodiment, the motor speed is obtained and the motor safety state is controlled by designing a voltage signal to frequency signal unit, a frequency signal to voltage signal unit, an electronic switch module, an ASC logic module, a rotary transformer excitation signal generation unit, and a motor rotary transformer sensor.

[0091] In a specific embodiment, a vehicle drive motor safety state control device is provided. Figure 3 This is a circuit diagram of the safety state control device for the automobile drive motor. It should be noted that the device has three modules: a high-voltage battery, a high-power DC conversion circuit, and a low-voltage battery (note that these three external parts are other parts of the vehicle and do not belong to the specific components of the safety state control device for the automobile drive motor. For the convenience of understanding, Figure 3 In addition, the specific connection relationship of each component of the device can be based on Figure 3 The wiring relationship is known and will not be described here. Figure 3 It can be seen that the device includes:

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

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

[0094] In this embodiment, the high-voltage power circuit draws power from the high-voltage battery so that the vehicle drive motor safety state control device (hereinafter referred to as the device) can still work when the low-voltage battery fails. One of the power sources is connected to a diode (i.e. Figure 3 D2 in the back and low voltage battery connected diode (ie Figure 3 D1 in the figure) and then supplies power to the DC conversion circuit and PMIC at the same time. It should be noted that due to the effect of the diode, only one of the power supply of the high-voltage power supply circuit and the power supply of the low-voltage battery can work at the same time. The circuit design of this embodiment is that only the low-voltage battery supplies power when the device is working normally, and when the low-voltage battery fails, the high-voltage power supply circuit supplies power. In addition, the other power supply of the high-voltage power supply circuit is connected to the diode (i.e. Figure 3 D3 in the back and the DC conversion circuit connected to the diode (ie Figure 3 D4 in the circuit) supplies power to the lower bridge arm drive power supply, ASC logic, electronic switch, voltage signal to frequency signal unit, frequency signal to voltage signal unit and resolver excitation signal generation unit at the same time. It should be noted that due to the effect of the diode, only one of the power supply of the high-voltage power supply circuit and the power supply of the DC conversion circuit can work at the same time. The design is that only the DC conversion circuit supplies power when the device is working normally; when the DC conversion circuit fails, the high-voltage power supply circuit supplies power.

[0095] In this embodiment, the DC conversion circuit generates two power supplies, one of which is used to supply power to the upper bridge arm drive power supply, and the other power supply can be found in the relevant description of the high-voltage power supply circuit, which will not be repeated here.

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

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

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

[0099] In this 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 called 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., Figure 3 EXC in the motor); the motor resolver sensor outputs a sinusoidal signal (i.e. Figure 3 SIN) and cosine signal (i.e. Figure 3 The resolver SIN / COS signal conditioning unit conditions the sine and cosine signals 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, and converts the sine signal output by the motor resolver sensor into a voltage signal. Figure 3 Only the signal processing flow of the sine signal SIN is drawn. 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 for envelope detection, and then the corresponding safety state control signal SS3 (i.e., the third safety state control signal) is generated according to the frequency signal after envelope detection and output to the ASC logic module. At the same time, after the frequency signal to voltage signal unit works, it will output a prohibition signal to the electronic switch to prohibit the control effect of the SS1 and SS2 signals on the ASC logic module.

[0100] It should be noted that, in this embodiment, since the circuit is designed so that the speed signal is proportional to the frequency signal, and the frequency signal is also proportional to the output voltage signal, a high speed will correspond to a higher voltage, and a 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 high speed and low speed of the motor are distinguished by the magnitude relationship between the voltage signal and the preset reference voltage. Specifically, in the frequency signal to voltage signal unit, the output voltage value passes through a voltage comparator and a safe state control signal SS3 (i.e., a third safe state control signal) is output according to the comparison result. Signal SS3 controls the ASC logic to output a safe state control signal SS (i.e., a second control signal). Signal SS controls the lower bridge arm drive circuit to enter the lower bridge arm ASC mode when the motor has a high speed and to enter the SPO mode when the motor has a low speed.

[0101] In this embodiment, when the motor control system operates normally, an accurate motor speed signal is required. However, after the MCU or PMIC fails, the motor control system does not need an accurate speed signal when entering a safe state. It only needs to know whether the current motor is in a high speed state or a low speed state. This embodiment determines the motor speed by designing a voltage signal to frequency signal unit, a frequency signal to voltage signal unit, an electronic switch, an ASC logic module, a resolver excitation signal generation unit, and a motor resolver sensor, and enters the ASC mode when the motor is at a high speed and enters the SPO mode when the motor is at a low speed.

[0102] An embodiment of the present invention also provides an embodiment of a method for controlling the safe state of a vehicle drive motor. 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 a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0103] In this embodiment, a method for controlling the safety state of a vehicle drive motor is provided, which is applied to a method device for controlling the safety state of a vehicle drive motor. Figure 4 FIG. 1 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. Figure 4 As shown, the process 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 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.

[0105] Step S402: the switch module determines a gating 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 it to the ASC logic module.

[0106] In step S403 , 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.

[0107] It should be noted that the relevant contents of the power chip, processor, motor speed acquisition module, ASC logic module and motor control module in this embodiment are mentioned above and will not be repeated here.

[0108] The automobile drive motor safety state control method of the embodiment of the present invention obtains the first control signal output by the motor speed acquisition module to enable the switch module to perform the gating processing of the corresponding signal, and then enables the ASC logic module to perform corresponding safety state control on the motor control module according to the gating signal output by the switch module, thereby realizing effective control of the motor safety state under the condition of power chip and / or processor failure, improving the control efficiency of the motor safety state, reducing the development cost of the motor safety state control, ensuring the safe, reliable and stable operation of the whole vehicle, and greatly meeting the user's safety vehicle use needs.

[0109] In this embodiment, a method for controlling the safety state of a vehicle drive motor is provided, which is applied to a method device for controlling the safety state of a vehicle drive motor. Figure 5 FIG. 1 is a flow chart of another method for controlling the safety state of a vehicle drive motor according to an embodiment of the present invention. Figure 5 As shown, the process includes the following steps:

[0110] In step S501, 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 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.

[0111] Specifically, in the above step S501, 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, including:

[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 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.

[0113] In step S5012, 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.

[0114] Step S5013: the motor resolver sensor obtains the 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 conversion unit.

[0115] Step S5014: After receiving the first safety state control signal and / or the second safety state control signal, the frequency signal to voltage signal 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 the 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.

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

[0117] In this embodiment, the step S5014 generates the third safety state control signal based on the magnitude relationship between the voltage signal and the preset reference voltage, including:

[0118] Step A1: when the voltage signal is greater than a preset reference voltage, determine that the third safety state control signal is a high level signal.

[0119] Step A2: when the voltage signal is not greater than a preset reference voltage, determining that the third safety state control signal is a low level signal.

[0120] This embodiment identifies the third safety state control signal through the magnitude relationship between the voltage signal and the preset reference voltage, which can achieve simple determination of the third safety state control signal and further simplify the acquisition of the motor speed.

[0121] In the embodiment of the present invention, a voltage signal to frequency signal unit, a resolver excitation signal generating unit, a motor resolver sensor and a frequency signal to voltage signal unit are used to obtain a frequency signal after envelope detection of a sine signal or a cosine signal generated by a motor resolver sensor to generate a corresponding voltage value, 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 motor safety state and further improve the control efficiency of the motor safety state.

[0122] Step S502: The switch module determines a gating 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. Figure 4 Step S402 of the illustrated embodiment will not be described in detail here.

[0123] In step S503 , 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.

[0124] Specifically, in the above step S202, the ASC logic module outputs the second control signal corresponding to the selection signal, including:

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

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

[0127] Step B2, when the first control signal includes a prohibition signal, determine that the selection signal of the switch module is a 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 includes a prohibition signal, it indicates that the power chip and / or processor has failed 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 control the motor safety state.

[0129] Step B3, when the first control signal does not include a prohibition signal, determining that the selection signal of the switch module is the first safety state control signal and / or the second safety state control signal, and further determining that the second control signal is a low level signal.

[0130] In this embodiment, when the first control signal does not include a prohibition signal, it indicates that the motor speed acquisition module has failed. At this time, it is necessary to identify the second control signal as a low-level signal through 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. This can ensure the reliable operation of the vehicle drive motor safety state control device under different working conditions, thereby ensuring the safe operation of the entire vehicle.

[0131] In the embodiment of the present invention, the selection signal and the second control signal of the switch module are determined by whether the first control signal output by the motor speed acquisition module contains a prohibition signal, which can ensure the accuracy of signal recognition, realize flexible control of the motor safety state under different operating conditions, reduce the failure rate of the motor control system, and thus ensure the safe operation of the entire vehicle.

[0132] In this embodiment, the corresponding safety state control of the motor control module based on the second control signal in the above 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, controlling the motor to enter the SPO mode.

[0135] In an embodiment of the present invention, the second control signal is designed according to the proportional relationship between voltage and speed to control the motor to enter the lower bridge arm ASC mode when the signal is high, and to control the motor to enter the SPO mode when the signal is low, thereby realizing flexible and efficient control of the motor safety state.

[0136] In a specific embodiment, based on Figure 3 A circuit structure schematic diagram of a vehicle drive motor safety state control device is provided, and a corresponding vehicle drive motor safety state control process is provided. Figure 6 This is a logical diagram of the safety state control process of the automobile drive motor. Figure 6 It can be seen that the specific process includes:

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

[0138] It should be noted that, in the present embodiment, the voltage signal to frequency signal unit and the frequency signal to voltage signal unit are in a non-working state during normal operation of the motor control system (hereinafter referred to as the system); after the PMIC fails or the MCU fails, the system first directly controls the ASC logic to enter the lower arm ASC mode according to the safety status control signal SS1 of the PMIC or the safety status control signal SS2 of the MCU. This process lasts for a short time, generally only a few milliseconds, which is within the acceptable range of functional safety.

[0139] In this embodiment, when the PMIC fails or the MCU fails, the safety state control signal SS1 of the PMIC or the safety state control signal SS2 of the MCU is simultaneously used as an enable signal, which can enable the voltage signal to frequency signal unit and the frequency signal to voltage signal unit, so that the motor speed acquisition module is in a working state (that is, each component in the motor speed acquisition module performs corresponding work). After the frequency signal to voltage signal unit works, the signal action of the safety state control signals SS1 and SS2 will be prohibited through an 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] Step D2: the voltage signal to frequency signal conversion unit generates a frequency signal according to a preset voltage and outputs it to the resolver excitation signal generation unit.

[0141] In this embodiment, after the voltage signal to frequency signal conversion unit is in operation, 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] Step D3: the resolver excitation signal generating 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 COS signal output by the resolver sensor, and then generates a voltage value according to the detected frequency signal and outputs a safety state control signal SS3 through a voltage comparator.

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

[0145] Step D5, SS3 outputs a 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 speed is high, and enter the SPO mode when the motor speed is low.

[0146] In summary, the automobile drive motor safety state control method of the embodiment of the present invention can improve the control efficiency of the motor safety state, reduce the development cost of the motor safety state control, ensure the safe, reliable and stable operation of the whole vehicle, and greatly meet the user's safety vehicle use needs.

[0147] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all 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 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 respectively connected to the power 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; 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 correspondingly after the power chip fails, and the second safety state control signal is generated correspondingly after the processor fails; The switch module determines a selection 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 it to the ASC logic module, so that the ASC logic module performs corresponding safety state control on the motor control module according to the selection signal.

2. The vehicle drive motor safety state control device according to claim 1, characterized in that: The motor speed acquisition module includes a voltage signal to frequency signal unit, a resolver excitation signal generating unit, a motor resolver sensor and a frequency signal to voltage signal unit connected in sequence; The voltage signal to frequency signal unit is connected to the power chip and the processor respectively, 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 generating 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 to voltage signal unit is connected to the power supply chip and the processor respectively, and is used 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 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 the 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.

3. The vehicle drive motor safety state control device according to claim 2, characterized in that: 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.

4. The vehicle drive motor safety state control device according to claim 3, characterized in that: The ASC logic module performs corresponding safety state control on the motor control module according to the strobe signal, including: 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 a preset reference voltage, the third safety state control signal is a low level signal.

5. The vehicle drive motor safety state control device according to claim 4, characterized in that: The motor control module includes a driving circuit unit, a three-phase bridge unit and a motor connected in sequence; Wherein, the driving circuit unit includes a lower bridge arm driving circuit and an upper bridge arm driving circuit, and is used 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 work; The three-phase bridge unit includes a lower bridge arm power module and an upper bridge arm power module, which are used to perform corresponding operations according to the working status of the lower bridge arm drive circuit and / or the upper bridge 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 bridge arm ASC mode; when the second control signal is a low-level signal, the motor is controlled to enter the SPO mode.

6. The vehicle drive motor safety state control device according to claim 2, 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.

7. A method for controlling the safety state of a vehicle drive motor, applied to the vehicle drive motor safety state control device according to any one of claims 1 to 6, 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 and in combination with a preset reference voltage, wherein the first safety state control signal is generated correspondingly after the power chip fails, and the second safety state control signal is generated correspondingly after the processor fails; The switch module determines a gating 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 it 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.

8. The method for controlling the safe state of a vehicle drive motor according to claim 7, 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 the 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.

9. The method for controlling the safe state of a vehicle drive motor according to claim 8, characterized in that: The generating a third safety state control signal based on the magnitude relationship between the voltage signal and a preset reference voltage comprises: 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, it is determined that the third safety state control signal is a low level signal.

10. The method for controlling the safe state of a vehicle drive motor according to claim 8, characterized in that: 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.

11. The method for controlling the safe state of a vehicle drive motor according to claim 10, 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 then the second control signal is determined to be a low level signal.

12. The method for controlling the safe state of a vehicle drive motor according to claim 11, 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 bridge 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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