Steering motor phase line cutting method, circuit, system and vehicle

Abstract

The invention provides a steering motor phase line cut-off method, circuit and system and a vehicle, and relates to the technical field of motor control, and the method comprises the steps: receiving a preset instruction which is represented as an instruction for turning off a phase line mos tube; the current rotating speed of the motor, the reverse electromotive force coefficient of the motor and the breakdown threshold voltage of a phase line mos tube are obtained in real time; determining the current reverse electromotive force of the motor by combining the current rotating speed and the reverse electromotive force coefficient; and when it is determined that a preset condition is met, a preset instruction is responded to control the phase line mos transistor to be turned off, and the preset condition includes that the current reverse electromotive force is smaller than the breakdown threshold voltage. The problem in the prior art that when a phase line mos tube is cut off during high-speed operation of a motor, high reverse electromotive force is generated, and components in a circuit are easily damaged is solved.

Description

Technical Field

[0001] The present disclosure relates to the field of motor control technology, and in particular to a steering motor phase line cutting method, circuit, system and vehicle. Background Art

[0002] With the rapid development of electrification in the automotive industry, steering control is moving towards drive-by-wire, placing increasingly stringent requirements on steering controllers (EPSECUs). In the event of a controller failure, the motor output must be quickly shut off to return the EPS system to a safe state, meeting the requirements of functional safety and failure protection mechanisms.

[0003] The existing technical solution is to use MOSFET as a switch (called phase line MOSFET) in the three-phase circuit of the control module driving the three-phase motor, which is used to quickly cut off the circuit connection of the phase line MOSFET when the full-bridge MOSFET module fails due to short circuit.

[0004] However, in the above technical solution, if the phase MOS tube is cut off during high-speed operation of the motor, the motor stops instantly, which will generate a high reverse electromotive force, easily causing damage to components in the circuit and making the EPS unable to work normally. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present disclosure provides a steering motor phase line cutting method, circuit, system and vehicle, which solves the problem in the existing technology that when the motor cuts off the phase line MOS tube during high-speed operation, it will generate a high reverse electromotive force, which may easily cause damage to components in the circuit.

[0006] At least one embodiment of the present disclosure provides a method for cutting off a phase line of a steering motor, comprising: receiving a preset instruction, wherein the preset instruction is characterized as an instruction to turn off a phase line MOSFET; Acquire the current speed of the motor, the back electromotive force coefficient of the motor, and the breakdown threshold voltage of the phase line MOSFET in real time; determine the current back electromotive force of the motor by combining the current speed and the back electromotive force coefficient; When it is determined that the preset conditions are met, the phase line MOS tube is controlled to be turned off in response to the preset instruction, wherein the preset conditions include: The current reverse electromotive force is smaller than the breakdown threshold voltage.

[0007] The technical solution provided by the present disclosure has at least the following beneficial effects: By obtaining the current speed, back electromotive force coefficient, and breakdown threshold voltage of the motor, when it is necessary to shut down the phase line MOSFET, it can be determined whether the back electromotive force generated by shutting down the phase line MOSFET will damage the components in the circuit. Only when it is determined that the back electromotive force generated above will not damage the components in the circuit will the preset instruction be responded to to control the phase line MOSFET to shut down, thereby ultimately achieving the purpose of protecting the circuit.

[0008] In one embodiment of the present disclosure, a method for cutting off a phase line of a steering motor is provided, wherein receiving a preset instruction includes: Receive preset instructions and start timing; The preset conditions also include: The timing duration is greater than the preset duration.

[0009] The technical solution provided by the present disclosure has at least the following beneficial effects: By adding a condition that the duration is greater than the preset duration, the problem of transient voltage in the circuit can be solved, as well as the state uncertainty problem caused by the delay in circuit signal transmission; The reverse electromotive force judgment and timing judgment in the preset conditions of this scheme can provide dual protection from "steady state + transient state" to improve the safety of circuit operation.

[0010] One embodiment of the present disclosure provides a method for cutting off a phase line of a steering motor, the method further comprising: in a process of responding to the preset instruction, slowing down the discharge speed of the charge when the phase line MOSFET is turned off by using the capacitance between the source and the drain of the phase line MOSFET.

[0011] The technical solution provided by the present disclosure has at least the following beneficial effects: By utilizing the above capacitor, the discharge speed of the charge when the phase line MOSFET is turned off is delayed, thereby preventing the control module from being interfered with by data and causing calculation errors, thereby avoiding potential uncertain risk factors.

[0012] At least one embodiment of the present disclosure further provides a steering motor control circuit, comprising: a control module, a full-bridge MOS module, a phase line MOS module, a power supply module, and a motor position sensor chip, wherein: The power supply module is connected to one power terminal of the phase line MOS module through the full-bridge MOS module, and the other power terminal of the phase line MOS module is configured to be connected to the motor; The first output end of the control module is connected to the control end of the full-bridge MOS module, the second output end of the control module is connected to the control end of the phase line MOS module, and the first input end of the control module is connected to the motor position sensor chip to obtain the current speed of the motor in real time; The control module stores a back electromotive force coefficient of the motor and a breakdown threshold voltage of each phase line mos tube in the phase line mos module; The control module is configured to, after receiving a preset instruction, determine a current back electromotive force of the motor in combination with the current rotating speed and the back electromotive force coefficient, and control the phase line mos module to be turned off when a preset condition is met, wherein the preset condition includes: The current back electromotive force is less than the breakdown threshold voltage.

[0013] In a steering motor control circuit provided in an embodiment of the present disclosure, the control module further includes a timing unit, and the control module is further configured to control the timing unit to start timing after receiving the preset instruction; and the preset condition further includes: The timing duration of the timing unit is greater than a preset duration.

[0014] In a steering motor control circuit provided in an embodiment of the present disclosure, the circuit further includes a plurality of capacitors, wherein: The gate and the source of each mos tube in the phase line mos module are connected through one of the capacitors.

[0015] In a steering motor control circuit provided in an embodiment of the present disclosure, the circuit further includes: An anti-reverse switch tube, a third output end of the control module is connected to a control end of the anti-reverse switch tube, and the power supply module is connected to the high side of the full-bridge mos module through a power end of the anti-reverse switch tube; A second input end of the control module is connected to the high side of the full-bridge mos module, for monitoring a driving voltage of each high-side mos tube in the full-bridge mos module.

[0016] In a steering motor control circuit provided in an embodiment of the present disclosure, a third input end of the control module is connected to the source of each high-side mos tube in the full-bridge mos module, for monitoring a phase node voltage in the full-bridge mos module; A fourth input end and a fifth input end of the control module are both connected to the source of each low-side mos tube in the full-bridge mos module, for respectively monitoring a source voltage of each low-side mos tube in the full-bridge mos module and a phase line current of the full-bridge mos module.

[0017] An electric power assisted steering motor phase line cut-off control system is also provided in an embodiment of the present disclosure, which includes a steering motor control circuit as described above.

[0018] An embodiment of the present disclosure further provides a vehicle, including a vehicle body, and an electric power steering motor phase line cut-off control system as described above, which is configured in the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic flow chart of a method for cutting off a phase line of a steering motor provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of the circuit structure of a steering motor control circuit provided in an embodiment of the present disclosure.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows: S10, control module, S20, full-bridge MOS module, S30, phase line MOS module, S40, power supply module, S50, motor position sensor chip. DETAILED DESCRIPTION

[0021] The principles and features of the present disclosure are described below. The examples given are only used to explain the present disclosure and are not used to limit the scope of the present disclosure.

[0022] The present disclosure provides a method for cutting off the phase line of a steering motor. Figure 1 Shown, including: receiving a preset instruction, where the preset instruction is characterized as an instruction to turn off the phase line MOSFET; Obtain the current speed of the motor, the back electromotive force coefficient of the motor, and the breakdown threshold voltage of the phase line MOSFET in real time; combine the current speed and back electromotive force coefficient to determine the current back electromotive force of the motor; When it is determined that the preset conditions are met, the phase line MOSFET is controlled to be turned off in response to the preset instruction, wherein the preset conditions include: the current reverse electromotive force is less than the breakdown threshold voltage.

[0023] By obtaining the current speed, back electromotive force coefficient, and breakdown threshold voltage of the motor, when it is necessary to shut down the phase MOSFET, it can be determined whether the back electromotive force generated by shutting down the phase MOSFET will damage the components in the circuit. Only when it is determined that the back electromotive force generated above will not damage the components in the circuit will the preset instruction be responded to to control the shutdown of the phase MOSFET, thereby ultimately achieving the purpose of protecting the circuit.

[0024] In an exemplary embodiment provided by the present disclosure, receiving a preset instruction includes: Receive preset instructions and start timing; The preconditions also include: The timing duration is longer than the preset duration.

[0025] Of course, the above-mentioned timing also includes countdown, that is, from the preset time length, the countdown starts, and when the timing is zero, it is determined that the preset condition is met, or The above-mentioned timing can also be: record the current time in real time, and when the difference between the starting time of the timing and the latest current time is greater than the preset time length, it is determined that the preset condition is met.

[0026] By adding the condition that the new time length is greater than the preset time length, the problem of transient voltage in the circuit can be solved, and the problem of state uncertainty caused by the delay of circuit signal transmission can be solved. In this scheme, the reverse electromotive force judgment and timing judgment in the preset condition can provide double protection from "steady state + transient state", and improve the safety of circuit operation.

[0027] In one exemplary embodiment provided by the present disclosure, the method further comprises: In the process of responding to the preset instruction, the discharge speed of the charge when the phase line mos tube is turned off is delayed through the capacitor between the source and the drain of the phase line mos tube.

[0028] By using the above-mentioned capacitor, the discharge speed of the charge when the phase line mos tube is turned off can be delayed, which can prevent the control module S10 from being disturbed by data calculation errors, and further avoid potential risk factors.

[0029] The present disclosure also provides a steering motor control circuit, please refer to Figure 2 As shown in the figure, it comprises: a control module S10, a full-bridge mos module S20, a phase line mos module S30, a power supply module S40, and a motor position sensor chip S50, wherein, The above-mentioned full-bridge mos module S20 comprises mos tube Q4, mos tube Q5, mos tube Q6, mos tube Q7, mos tube Q8 and mos tube Q9, wherein, The source of mos tube Q4 is connected to the drain of mos tube Q7, the source of mos tube Q5 is connected to the drain of mos tube Q8, the source of mos tube Q6 is connected to the drain of mos tube Q9, the drains of mos tube Q4, mos tube Q5 and mos tube Q6 are connected together, and the drains of mos tube Q7, mos tube Q8 and mos tube Q9 are connected together through a resistor, and then grounded.

[0030] The above-mentioned mos tube Q4, mos tube Q5 and mos tube Q6 constitute the high side of the full-bridge mos module S20, and the mos tube Q7, mos tube Q8 and mos tube Q9 constitute the low side of the full-bridge mos module S20.

[0031] The power supply module S40 is connected to one power terminal of the phase line MOS module S30 through the full-bridge MOS module S20. The other power terminal of the phase line MOS module S30 is configured to be electrically connected to the motor. Specifically, the power supply module S40 is connected to the drain terminal of the MOS tube Q4 in the full-bridge MOS module S20. The above-mentioned phase line MOS module S30 includes MOS tube Q1, MOS tube Q2 and MOS tube Q3, wherein, The source of MOSFET Q1 is connected to the source of MOSFET Q4, the drain of MOSFET Q1 is connected to the U phase of the steering motor, the source of MOSFET Q2 is connected to the source of MOSFET Q5, the drain of MOSFET Q2 is connected to the V phase of the steering motor, the source of MOSFET Q3 is connected to the source of MOSFET Q6, and the drain of MOSFET Q3 is connected to the W phase of the steering motor.

[0032] The first output terminal of the control module S10 is connected to the control terminal of the full-bridge MOS module S20, the second output terminal of the control module S10 is connected to the control terminal of the phase line MOS module S30, and the first input terminal of the control module S10 is connected to the motor position sensor chip S50 to obtain the current speed of the motor in real time, wherein, In this embodiment, the control module S10 includes a central processing unit and a motor drive chip that are communicatively connected to each other. The first input terminal of the control module S10 is the input terminal of the central processing unit, that is, the central processing unit receives the current speed information sent by the motor position sensor chip S50; The first output terminal of the control module S10 is the first port and the second port of the motor driver chip, wherein the first port is used to connect the gates of MOS tube Q4, MOS tube Q5 and MOS tube Q6 respectively, corresponding to Figure 2 The middle and high side control *3 circuit is used to turn off or open MOSFET Q4, MOSFET Q5 and MOSFET Q6 according to the control signal sent by the central processor; the second port is used to connect the gates of MOSFET Q7, MOSFET Q8 and MOSFET Q9 respectively, corresponding to Figure 2 Mid- and low-side control *3 circuits, which turn off or on MOSFET Q7, MOSFET Q8, and MOSFET Q9 according to the control signal sent by the central processor; The second output terminal of the control module S10 is the third port of the motor driver chip, wherein the third port is used to connect the gates of MOS tube Q1, MOS tube Q2 and MOS tube Q3 respectively, corresponding to Figure 2 The phase line MOS control *3 circuit in the circuit is used to turn off or open MOS tube Q1, MOS tube Q2 and MOS tube Q3 according to the response of the central processor to the preset instruction; The central processor of the control module S10 stores the back electromotive force coefficient of the motor and the breakdown threshold voltage of each phase MOS tube in the phase MOS module S30; The central processing unit of the control module S10 is configured to determine the current back electromotive force of the motor in combination with the current speed and the back electromotive force coefficient after receiving a preset instruction, and control the MOSFET Q1, MOSFET Q2 and MOSFET Q3 in the phase line MOSFET module S30 to be turned off through the third port of the motor driver chip when the preset conditions are met, wherein the preset conditions include: the current back electromotive force is less than the breakdown threshold voltage.

[0033] Based on the above circuit, the central processing unit obtains the current speed, back electromotive force coefficient, and breakdown threshold voltage of the motor. When it is necessary to shut down each phase MOSFET, it can determine whether the back electromotive force generated by the current phase MOSFET will damage the components in the circuit. Only when it is determined that the back electromotive force generated above will not damage the components in the circuit will it respond to the preset instruction to control the phase MOSFET to shut down, thereby ultimately achieving the purpose of protecting the circuit.

[0034] In an exemplary embodiment provided by the present disclosure, there is also a timing unit in the central processing unit, and the central processing unit in the control module S10 is further configured to control the timing unit to start timing after receiving a preset instruction; The preconditions also include: The timing duration of the timing unit is greater than the preset duration.

[0035] By adding a condition that the duration is greater than the preset duration, the problem of transient voltage in the circuit can be solved, as well as the state uncertainty problem caused by the delay in circuit signal transmission; The reverse electromotive force judgment and timing judgment in the preset conditions of this scheme can provide dual protection from "steady state + transient state" to improve the safety of circuit operation.

[0036] In an exemplary embodiment provided by the present disclosure, the circuit further includes: a capacitor C1, a capacitor C2, and a capacitor C3, wherein: The gate and source of each MOSFET in the phase line MOSFET module S30 are connected through a capacitor. Specifically, the gate of MOSFET Q1 is connected to its source through capacitor C1, the gate of MOSFET Q2 is connected to its source through capacitor C2, and the gate of MOSFET Q3 is connected to its source through capacitor C3.

[0037] By utilizing the above capacitors to slow down the discharge speed of the charge when the phase line MOSFET is turned off, the control module S10 can be prevented from being miscalculated by data interference, thereby avoiding potential uncertain risk factors.

[0038] In an exemplary embodiment provided by the present disclosure, the circuit further includes: Anti-reverse switch tube, the anti-reverse switch tube Figure 2The third output end of the control module S10 is connected with the control end of the anti-reverse switch tube, and the power supply module S40 is connected with the high side of the full-bridge mos module S20 through the power end of the anti-reverse switch tube, wherein the third output end of the control module S10 is the fourth port of the motor drive chip, and in Figure 2 The fourth port of the motor drive chip is connected with the gate of the mos tube Q10, and the power supply module S40 is connected with the high side of the full-bridge mos module S20 through the drain and source of the mos tube Q10 in sequence; The second input end of the control module S10 is connected with the high side of the full-bridge mos module S20, so as to monitor the driving voltage of each high-side mos tube in the full-bridge mos module S20, wherein the second input end of the control module S10 is the fifth port of the motor drive chip, and in Figure 2 The fifth port of the motor drive chip is specifically connected at the drain of the mos tube Q4, so as to monitor the driving voltage of each high-side mos tube in the full-bridge mos module S20, and cooperate with the mos tube Q10, when the current in the circuit is reversed, the mos tube Q10 is controlled to be turned off through the fourth port, so as to protect the circuit.

[0039] In one of the embodiments provided in the present disclosure, the third input end of the control module S10 is connected with the source of each high-side mos tube in the full-bridge mos module S20, so as to monitor the phase node voltage in the full-bridge mos module S20, wherein the third input end of the control module S10 is the sixth port of the motor drive chip, and in Figure 2 The sixth port of the motor drive chip is connected with the source of the mos tube Q4, the source of the mos tube Q5 and the source of the mos tube Q6 respectively, the fourth input end and the fifth input end of the control module S10 are connected with the source of each low-side mos tube in the full-bridge mos module S20, so as to monitor the source voltage of each low-side mos tube in the full-bridge mos module S20 and the phase current of the full-bridge mos module S20 respectively, wherein the fourth input end of the control module S10 is the seventh port of the motor drive chip, and in Figure 2 The seventh port of the motor drive chip is connected with the source of the mos tube Q7, the source of the mos tube Q8 and the source of the mos tube Q9 respectively, so as to monitor the source voltage of each low-side mos tube in the full-bridge mos module S20; The fifth input end of the control module S10 is the eighth port of the motor drive chip, and in Figure 2 The eighth port of the motor drive chip is connected with the source of the mos tube Q7, the source of the mos tube Q8 and the source of the mos tube Q9 respectively, so as to monitor the phase current of the full-bridge mos module S20.

[0040] Through the above phase current feedback 3 lines, SLx feedback 3 lines and SHx feedback 3 lines, the state of the current full-bridge mos module S20 can be monitored in real time.

[0041] The embodiment of the present disclosure further provides an electric power steering motor phase line cut-off control system, comprising a steering motor control circuit as described above.

[0042] The embodiment of the present disclosure further provides a vehicle, comprising a vehicle body and an electric power steering motor phase line cut-off control system as described above arranged in the vehicle body.

[0043] The embodiment of the present disclosure further provides another phase line cut-off control system, comprising: An instruction receiving module configured to receive a preset instruction, the preset instruction representing an instruction to turn off a phase line mos tube; A data obtaining module configured to obtain a current rotating speed of the motor, a back electromotive force coefficient of the motor and a breakdown threshold voltage of the phase line mos tube in real time; A calculating module configured to determine a current back electromotive force of the motor in combination with the current rotating speed and the back electromotive force coefficient; An instruction responding module configured to control the phase line mos tube to be turned off in response to the preset instruction in a case where a preset condition is met, wherein the preset condition comprises: The current back electromotive force is less than the breakdown threshold voltage.

[0044] In one exemplary embodiment provided by the present disclosure, the instruction receiving module specifically comprises: Receiving the preset instruction and starting timing; The preset condition further comprises: The timing duration is greater than a preset duration.

[0045] In one exemplary embodiment provided by the present disclosure, the above system further comprises: A delaying module configured to delay the discharge speed of the charge when the phase line mos tube is turned off through the capacitance between the source and the drain of the phase line mos tube in the process of responding to the preset instruction.

[0046] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0047] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0048] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0050] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for cutting off the phase line of a steering motor, characterized in that: include: receiving a preset instruction, wherein the preset instruction is characterized as an instruction to turn off a phase line MOSFET; Acquire the current speed of the motor, the back electromotive force coefficient of the motor, and the breakdown threshold voltage of the phase line MOSFET in real time; determine the current back electromotive force of the motor by combining the current speed and the back electromotive force coefficient; When it is determined that the preset conditions are met, respond to the preset instruction to control the phase line MOS tube to be turned off, wherein the preset conditions include: The current reverse electromotive force is smaller than the breakdown threshold voltage.

2. A method for cutting off a phase line of a steering motor according to claim 1, characterized in that: The receiving of the preset instruction includes: Receive preset instructions and start timing; The preset conditions also include: The timing duration is greater than the preset duration.

3. The method for cutting off a phase line of a steering motor according to claim 1, characterized in that: The method further comprises: In the process of responding to the preset instruction, the discharge speed of the charge when the phase line MOSFET is turned off is delayed through the capacitance between the source and the drain of the phase line MOSFET.

4. A steering motor control circuit, characterized in that: include: Control module, full-bridge MOS module, phase line MOS module, power supply module, and motor position sensor chip, among which, The power supply module is connected to one power terminal of the phase line MOS module through the full-bridge MOS module, and the other power terminal of the phase line MOS module is configured to be connected to the motor; The first output end of the control module is connected to the control end of the full-bridge MOS module, the second output end of the control module is connected to the control end of the phase line MOS module, and the first input end of the control module is connected to the motor position sensor chip to obtain the current speed of the motor in real time; The control module stores the back electromotive force coefficient of the motor and the breakdown threshold voltage of each phase MOS tube in the phase MOS module; The control module is configured to determine the current back electromotive force of the motor in combination with the current speed and the back electromotive force coefficient after receiving a preset instruction, and control the phase line MOS module to turn off when a preset condition is met, wherein the preset condition includes: The current reverse electromotive force is smaller than the breakdown threshold voltage.

5. The steering motor control circuit according to claim 4, characterized in that: The control module further includes: a timing unit, and the control module is further configured to control the timing unit to start timing after receiving the preset instruction; the preset conditions also include: The timing duration of the timing unit is greater than the preset duration.

6. The steering motor control circuit according to claim 4, characterized in that: The circuit further comprises: a plurality of capacitors, wherein: The gate and source of each MOS tube in the phase line MOS module are connected via the capacitor.

7. The steering motor control circuit according to claim 4, characterized in that: The circuit further comprises: Anti-reverse switching tube, the third output end of the control module is connected to the control end of the anti-reverse switching tube, and the power supply module is connected to the high side of the full-bridge MOS module through the power end of the anti-reverse switching tube; The second input end of the control module is connected to the high side of the full-bridge MOS module to monitor the driving voltage of each high-side MOS tube in the full-bridge MOS module.

8. The steering motor control circuit according to claim 7, characterized in that: The third input terminal of the control module is connected to the source of each high-side MOSFET in the full-bridge MOSFET module to monitor the voltage of each phase node in the full-bridge MOSFET module; The fourth input terminal and the fifth input terminal of the control module are both connected to the source of each low-side MOSFET in the full-bridge MOSFET module to respectively monitor the source voltage of each low-side MOSFET in the full-bridge MOSFET module and each phase line current of the full-bridge MOSFET module.

9. An electric power steering motor phase line cut-off control system, characterized in that: The invention comprises a steering motor control circuit as claimed in any one of claims 4 to 8.

10. A vehicle, characterized in that: The invention comprises a vehicle body, and an electric power steering motor phase line cut-off control system as claimed in claim 9, which is configured in the vehicle body.

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