Automobile power-assisted steering control device powered by 48V

Abstract

The utility model relates to an automobile power-assisted steering control device powered by 48V. The automobile power-assisted steering control device comprises a direct-current conversion module, a power management module, an OR gate, an MCU, a grid driving module and a motor driving module. According to the utility model, the direct current conversion module is arranged to convert a 48V direct current power supply into a 12V direct current voltage, and then the power management module is used to convert the 12V direct current voltage into a 5V direct current voltage for supplying power to the MCU; meanwhile, the grid driving module and the motor driving module are powered by 48V direct current voltage, and compared with 12V voltage power supply, the 48V voltage consumes lower electric energy on a power supply wire harness; an OR gate control circuit is additionally arranged in front of a pre-driven enable signal, the circuit is controlled by fault signals of an MCU and a power management module, and the MCU or a power chip outputs a low-level control signal so that the pre-driven motor can be closed to enter a safe state.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, specifically to a 48V powered automotive power steering control device. Background Technology

[0002] With the electrification and intelligentization of automobiles, and the significant increase in electrical equipment, 48V systems are expected to become widespread in smart cars.

[0003] Steering systems are high-power loads with extremely high electricity consumption. Traditional 12V electric steering systems suffer significant energy losses in the wiring harness and controller, which not only hinders energy conservation and carbon reduction efforts but also negatively impacts steering control performance. Utility Model Content

[0004] To address the technical problems of traditional 12V electric power steering systems, such as significant energy loss in the wiring harness and controller, which hinders energy conservation and carbon reduction, this invention provides a 48V powered automotive power steering control device.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A 48V powered automotive power steering control device includes a DC-DC conversion module, a power management module, an OR gate, an MCU, a gate drive module, and a motor drive module.

[0007] The input terminal of the DC-DC conversion module is connected to a 48V DC power supply. The output terminal of the DC-DC conversion module is electrically connected to the power input terminal of the power management module. The voltage regulation output terminal of the power management module is electrically connected to the power input terminal of the MCU. The fault signal terminal of the power management module is electrically connected to one input terminal of the OR gate. The control output terminal of the MCU is electrically connected to the other input terminal of the OR gate. The output terminal of the OR gate is electrically connected to the enable control terminal of the gate drive module. The serial communication terminal of the MCU is electrically connected to the control input terminal of the gate drive module. The drive output terminal of the gate drive module is electrically connected to the control terminal of the motor drive module. The power input terminal of the gate drive module is connected to the 48V DC power supply. The power input terminal of the motor drive module is connected to the 48V DC power supply. The phase drive output terminal of the motor drive module is electrically connected to the power input terminal of the motor.

[0008] The beneficial effects of this invention are as follows: A DC-DC conversion module converts 48V DC power to 12V DC voltage, and then a power management module converts the 12V DC voltage to 5V DC voltage for MCU power supply. Simultaneously, the gate drive module and motor drive module are powered by 48V DC voltage, which consumes less power in the power supply harness compared to 12V. By adding an OR gate control circuit before the enable signal of the pre-drive, controlled by fault signals from both the MCU and the power management module, a low-level control signal from either the MCU or the power chip can shut down the pre-drive, allowing the motor to enter a safe state. When the power management module detects a fault, the power chip fault signal can immediately issue a command to shut down the pre-drive, ensuring the system enters a safe state.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, it also includes a filtering module, one end of which is connected to the 48V DC power supply, and the other end of which is electrically connected to the input terminal of the DC-DC conversion module, the power input terminal of the gate drive module, and the power input terminal of the motor drive module.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting up a filtering module, the connected 48V DC power supply can be filtered to remove noise.

[0012] Furthermore, the filtering module is an inductor filter.

[0013] Furthermore, it also includes a CAN communication module, the transceiver end of which is electrically connected to the transceiver end of the MCU, and the signal transmitting end of the CAN communication module is electrically connected to the enable control end of the power management module.

[0014] The beneficial effect of adopting the above-mentioned further solution is that by setting up a CAN communication module, it is possible to communicate with the outside world through the CAN communication protocol, so as to realize the sending and receiving of information.

[0015] Furthermore, the DC-DC conversion module is a 48V to 12V power supply chip; the power management module uses a power management chip of model A4412; and the gate drive module uses an automotive MOSFET driver of model AMT49101.

[0016] Furthermore, the motor drive module includes a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a fifth MOSFET, a sixth MOSFET, a first resistor, a second resistor, and a third resistor;

[0017] The drive output terminal of the gate drive module is electrically connected to the gate of the first MOS transistor, the gate of the second MOS transistor, the gate of the third MOS transistor, the gate of the fourth MOS transistor, the gate of the fifth MOS transistor, and the gate of the sixth MOS transistor, respectively.

[0018] The drains of the first MOSFET, the third MOSFET, and the fifth MOSFET are all connected to the 48V DC power supply. The source of the first MOSFET is electrically connected to the drain of the fourth MOSFET, and the source of the fourth MOSFET is electrically connected to one end of the first resistor, with the other end of the first resistor grounded. The source of the sixth MOSFET is electrically connected to one end of the second resistor, with the other end of the second resistor grounded. The source of the second MOSFET is electrically connected to one end of the third resistor, with the other end of the third resistor grounded.

[0019] The three-phase power supply terminals of the motor are electrically connected to the source of the first MOS transistor, the source of the third MOS transistor, and the source of the fifth MOS transistor, respectively.

[0020] The advantage of adopting the above-mentioned further scheme is that a three-phase full-bridge circuit is formed by six N-channel power MOSFETs. These six MOSFETs are divided into two groups: three high-side MOSFETs are connected to the positive terminal of the power supply, and three low-side MOSFETs are connected to the negative terminal of the power supply. By controlling the switching on and off of the MOSFETs, the current is distributed in the motor windings to drive the motor.

[0021] Furthermore, the motor drive module also includes a seventh MOS transistor, the gate of which is electrically connected to the drive output terminal of the gate drive module, the drain of which is connected to the 48V DC power supply, and the source of which is electrically connected to the drain of the first MOS transistor, the drain of the third MOS transistor, and the drain of the fifth MOS transistor.

[0022] The beneficial effect of adopting the above-mentioned further solution is that by controlling the on / off state of the seventh MOSFET, the on / off state of the drain of the first MOSFET, the drain of the third MOSFET, and the 48V power supply voltage of the fifth MOSFET are controlled, thereby realizing the overall on / off state of the U, V, and W phases of the motor.

[0023] To address the aforementioned technical problems, the present invention also provides an automotive power steering control system, the specific technical details of which are as follows:

[0024] An automotive power steering control system includes the aforementioned 48V powered automotive power steering control device.

[0025] To address the aforementioned technical problems, the present invention also provides an automotive control system, the specific technical details of which are as follows:

[0026] An automotive control system includes the aforementioned 48V powered automotive power steering control device.

[0027] To address the aforementioned technical problems, the present invention also provides an automobile, the specific technical details of which are as follows:

[0028] An automobile includes the aforementioned 48V powered automobile power steering control device. Attached Figure Description

[0029] Figure 1 This is the circuit schematic diagram of this utility model;

[0030] Figure 2 This is the circuit schematic of the motor drive module.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Filtering module; 2. DC-DC conversion module; 3. Power management module; 4. OR gate; 5. MCU; 6. Gate driver module; 7. Motor driver module; 8. CAN communication module. Detailed Implementation

[0033] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0034] like Figure 1 As shown, this embodiment provides a 48V powered automotive power steering control device, including a DC-DC conversion module 2, a power management module 3, an OR gate 4, an MCU 5, a gate drive module 6, and a motor drive module 7.

[0035] The input terminal of the DC-DC conversion module 2 is connected to a 48V DC power supply. The output terminal of the DC-DC conversion module 2 is electrically connected to the power input terminal of the power management module 3. The voltage regulation output terminal of the power management module 3 is electrically connected to the power input terminal of the MCU 5. The fault signal terminal of the power management module 3 is electrically connected to one input terminal of the OR gate 4. The control output terminal of the MCU 5 is electrically connected to the other input terminal of the OR gate 4. The output terminal of the OR gate 4 is electrically connected to the enable control terminal of the gate drive module 6. The serial communication terminal of the MCU 5 is electrically connected to the control input terminal of the gate drive module 6. The drive output terminal of the gate drive module 6 is electrically connected to the control terminal of the motor drive module 7. The power input terminal of the gate drive module 6 is connected to the 48V DC power supply. The power input terminal of the motor drive module 7 is connected to the 48V DC power supply. The phase drive output terminal of the motor drive module 7 is electrically connected to the power input terminal of the motor.

[0036] A DC-DC converter 2 converts 48V DC power to 12V DC voltage, and then a power management module 3 converts the 12V DC voltage to 5V DC voltage for MCU power supply. Simultaneously, the gate drive module 6 and motor drive module 7 are powered by 48V DC voltage, which consumes less power in the power supply harness compared to 12V. An OR gate control circuit is added before the enable signal of the pre-drive, controlled by fault signals from both the MCU and power management module 3. A low-level control signal from either the MCU or the power chip can shut down the pre-drive, allowing the motor to enter a safe state. When the power management module 3 detects a fault, the power chip fault signal can immediately issue a command to shut down the pre-drive, bringing the system to a safe state. The DC-DC converter 2 is a 48V to 12V power chip; the power management module 3 is preferably an A4412 power management chip; and the gate drive module 6 is preferably an AMT49101 automotive MOSFET driver.

[0037] In some embodiments, the automotive power steering control device further includes a filter module 1. One end of the filter module 1 is connected to the 48V DC power supply, and the other end of the filter module 1 is electrically connected to the input terminal of the DC-DC conversion module 2, the power input terminal of the gate drive module 6, and the power input terminal of the motor drive module 7, respectively. The filter module 1 is an inductive filter. By providing the filter module 1, the connected 48V DC power supply can be filtered to remove noise.

[0038] In some embodiments, the automotive power steering control device further includes a CAN communication module 8. The transceiver terminal of the CAN communication module 8 is electrically connected to the transceiver terminal of the MCU 5, and the signal transmitting terminal of the CAN communication module 8 is electrically connected to the enable control terminal of the power management module 3. By setting the CAN communication module 8, communication with the outside world can be achieved through the CAN communication protocol, thereby realizing the transmission and reception of external information.

[0039] like Figure 2 As shown, the motor drive module 7 includes a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, a fifth MOSFET Q5, a sixth MOSFET Q6, a seventh MOSFET Q7, a first resistor R1, a second resistor R2, and a third resistor R3.

[0040] The drive output terminal of the gate drive module 6 is electrically connected to the gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, the gate of the third MOS transistor Q3, the gate of the fourth MOS transistor Q4, the gate of the fifth MOS transistor Q5, and the gate of the sixth MOS transistor Q6, respectively.

[0041] The drains of the first MOSFET Q1, the third MOSFET Q3, and the fifth MOSFET Q5 are all connected to the 48V DC power supply. The source of the first MOSFET Q1 is electrically connected to the drain of the fourth MOSFET Q4, and the source of the fourth MOSFET Q4 is electrically connected to one end of the first resistor R1, with the other end of the first resistor R1 grounded. The source of the sixth MOSFET Q6 is electrically connected to one end of the second resistor R2, with the other end of the second resistor R2 grounded. The source of the second MOSFET Q2 is electrically connected to one end of the third resistor R3, with the other end of the third resistor R3 grounded.

[0042] The three-phase power supply terminals of the motor are electrically connected to the source of the first MOSFET Q1, the source of the third MOSFET Q3, and the source of the fifth MOSFET Q5, respectively.

[0043] The gate of the seventh MOS transistor Q7 is electrically connected to the drive output terminal of the gate drive module 6, the drain of the seventh MOS transistor Q7 is connected to the 48V DC power supply, and the source of the seventh MOS transistor Q7 is electrically connected to the drain of the first MOS transistor Q1, the drain of the third MOS transistor Q3, and the drain of the fifth MOS transistor Q5, respectively.

[0044] The motor drive process is as follows: the first MOSFET Q1 and the second MOSFET Q2 are turned on, then the second MOSFET Q2 and the third MOSFET Q3 are turned on, then the third MOSFET Q3 and the fourth MOSFET Q4 are turned on, then the fifth MOSFET Q5 and the sixth MOSFET Q6 are turned on, and finally the sixth MOSFET Q6 and the first MOSFET Q1 are turned on; the above motor drive process is repeated to drive the motor.

[0045] A three-phase full-bridge circuit is constructed using six N-channel power MOSFETs. These six MOSFETs are divided into two groups: three high-side MOSFETs are connected to the positive terminal VBus of the power supply, and three low-side MOSFETs are connected to the negative terminal of the power supply. By controlling the on / off state of the MOSFETs, the current is distributed in the motor windings, driving the motor to operate. By controlling the on / off state of the seventh MOSFET Q7, the drains of the first MOSFET Q1, the drains of the third MOSFET Q3, and the fifth MOSFET Q5 are controlled to switch the 48V power supply, thereby controlling the overall power supply of the motor's U, V, and W phases.

[0046] This invention incorporates a DC-DC chip to convert the 48V power supply to 12V. The 12V power supplies the SBC (System-on-Card), and the SBC outputs 5V to power chips such as the MCU (Microcontroller Unit). Currently, mature DC-DC chips are available. The DC-DC chip is a QM (Quality Management) device, and to meet functional safety requirements, a detection circuit needs to be designed to satisfy the functional safety requirements of the EPS (Electric Power Supply) system. The MOS drive circuit is powered by a 48V power supply, and the MOS voltage rating needs to be increased to 80V, requiring a pre-driver chip capable of driving a 48V system.

[0047] The voltage withstand capability of some passive components needs to be significantly improved. For example, the electrolytic capacitors on the busbar need to be upgraded from 35V to over 63V. The capacitance value requirement of the electrolytic capacitors needs to be recalculated based on the motor current requirements.

[0048] An OR gate control circuit is added before the enable signal of the pre-drive. This circuit is controlled by fault signals from both the MCU and the power supply chip. A low-level control signal from either the MCU or the power supply chip can shut down the pre-drive, allowing the motor to enter a safe state. When the power supply chip detects a fault, its fault signal can immediately issue a command to shut down the pre-drive, thus bringing the system to a safe state.

[0049] The new solution significantly improves power efficiency: Under the same power load, increasing the voltage results in a substantial decrease in current, greatly reducing power loss in the wiring harness and controller. Power equals voltage multiplied by current; for the same load, a four-fold increase in voltage can result in a four-fold decrease in current. Power loss equals current multiplied by resistance; the lower the current, the lower the power loss. Furthermore, the significant reduction in current allows for a reduction in the diameter of the vehicle's wiring harness, enabling a lighter vehicle body. Additionally, the significantly reduced current makes heat dissipation in the controller much easier.

[0050] In other embodiments, the present invention also provides an automotive power steering control system, including the aforementioned 48V powered automotive power steering control device.

[0051] In other embodiments, the present invention also provides an automotive control system, including the aforementioned 48V powered automotive power steering control device.

[0052] In other embodiments, the present invention also provides a vehicle, the specific technical content of which is as follows:

[0053] An automobile includes the aforementioned 48V powered automobile power steering control device.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 48V powered automotive power steering control device, characterized in that: It includes a DC-DC conversion module (2), a power management module (3), an OR gate (4), an MCU (5), a gate drive module (6), and a motor drive module (7); The input terminal of the DC-DC converter module (2) is connected to a 48V DC power supply. The output terminal of the DC-DC converter module (2) is electrically connected to the power input terminal of the power management module (3). The voltage regulation output terminal of the power management module (3) is electrically connected to the power input terminal of the MCU (5). The fault signal terminal of the power management module (3) is electrically connected to one of the input terminals of the OR gate (4). The control output terminal of the MCU (5) is electrically connected to the other input terminal of the OR gate (4). The output terminal of the OR gate (4) is electrically connected to the enable control terminal of the gate drive module (6). The serial communication terminal of the MCU (5) is electrically connected to the control input terminal of the gate drive module (6). The drive output terminal of the gate drive module (6) is electrically connected to the control terminal of the motor drive module (7). The power input terminal of the gate drive module (6) is connected to the 48V DC power supply. The power input terminal of the motor drive module (7) is connected to the 48V DC power supply. The phase drive output terminal of the motor drive module (7) is electrically connected to the power input terminal of the motor.

2. The 48V powered automotive power steering control device according to claim 1, characterized in that: It also includes a filter module (1), one end of which is connected to the 48V DC power supply, and the other end of which is electrically connected to the input terminal of the DC conversion module (2), the power input terminal of the gate drive module (6), and the power input terminal of the motor drive module (7).

3. The 48V powered automotive power steering control device according to claim 2, characterized in that: The filtering module (1) is an inductor filter.

4. The 48V powered automotive power steering control device according to claim 1, characterized in that: It also includes a CAN communication module (8), the transceiver of which is electrically connected to the transceiver of the MCU (5), and the signal transmitting end of the CAN communication module (8) is electrically connected to the enable control end of the power management module (3).

5. The 48V powered automotive power steering control device according to claim 1, characterized in that: The DC-DC conversion module (2) is a 48V to 12V power chip; the power management module (3) is a power management chip of model A4412; the gate drive module (6) is an automotive MOSFET driver of model AMT49101.

6. The 48V powered automotive power steering control device according to claim 1, characterized in that: The motor drive module (7) includes a first MOSFET (Q1), a second MOSFET (Q2), a third MOSFET (Q3), a fourth MOSFET (Q4), a fifth MOSFET (Q5), a sixth MOSFET (Q6), a first resistor (R1), a second resistor (R2), and a third resistor (R3); The drive output terminal of the gate drive module (6) is electrically connected to the gate of the first MOS transistor (Q1), the gate of the second MOS transistor (Q2), the gate of the third MOS transistor (Q3), the fourth MOS transistor (Q4), the gate of the fifth MOS transistor (Q5), and the gate of the sixth MOS transistor (Q6), respectively. The drains of the first MOSFET (Q1), the third MOSFET (Q3), and the fifth MOSFET (Q5) are all connected to the 48V DC power supply. The source of the first MOSFET (Q1) is electrically connected to the drain of the fourth MOSFET (Q4), and the source of the fourth MOSFET (Q4) is electrically connected to one end of the first resistor (R1), with the other end of the first resistor (R1) grounded. The source of the sixth MOSFET (Q6) is electrically connected to one end of the second resistor (R2), with the other end of the second resistor (R2) grounded. The source of the second MOSFET (Q2) is electrically connected to one end of the third resistor (R3), with the other end of the third resistor (R3) grounded. The three-phase power supply terminals of the motor are electrically connected to the source of the first MOSFET (Q1), the source of the third MOSFET (Q3), and the source of the fifth MOSFET (Q5), respectively.

7. The 48V powered automotive power steering control device according to claim 6, characterized in that: The motor drive module (7) further includes a seventh MOS transistor (Q7). The gate of the seventh MOS transistor (Q7) is electrically connected to the drive output terminal of the gate drive module (6). The drain of the seventh MOS transistor (Q7) is connected to the 48V DC power supply. The source of the seventh MOS transistor (Q7) is electrically connected to the drain of the first MOS transistor (Q1), the drain of the third MOS transistor (Q3), and the drain of the fifth MOS transistor (Q5), respectively.

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