CN217864335U

CN217864335U - EPS motor control system

Info

Publication number: CN217864335U
Application number: CN202221051573.3U
Authority: CN
Inventors: 张磊; 钱磊; 屈强; 钱结苗
Original assignee: Bosch Huayu Steering Systems Co Ltd
Current assignee: Bosch Huayu Steering Systems Co Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-11-22
Anticipated expiration: 2032-05-05

Abstract

The utility model belongs to the technical field of electric power steering system technique and specifically relates to a EPS motor control system. The utility model provides a EPS motor control system, includes power circuit, control circuit, steering mechanism, host computer, its characterized in that: the power circuit comprises a storage battery, a DC/DC booster circuit, an inverter and a motor, wherein the DC/DC booster circuit is connected between the storage battery and the inverter, and the electrical output end of the inverter is connected with the electrical input end of the motor; the control circuit is electrically connected with the power circuit and the upper computer respectively; and the steering mechanism is mechanically connected with an output shaft of the motor. Compared with the prior art, the EPS motor control system has the advantages that the primary DC/DC boost converter is additionally arranged between the storage battery and the inverter, the core effect is to boost the input voltage of the inverter and then increase the output voltage of the inverter.

Description

EPS motor control system

Technical Field

The utility model belongs to the technical field of the electric power steering system technique and specifically relates to a EPS motor control system.

Background

The traditional EPS (electric power steering) system is supplied with power from a vehicle-mounted 12V power supply, and the motor is characterized by low voltage and large current, and the performance of the motor is sensitive to the input phase voltage. When the load is large, the voltage drop of the power supply can cause the output phase voltage of the inverter to be reduced, the maximum output torque of the motor at high rotating speed can be obviously reduced, and the driving experience is further influenced. The current of a conventional EPS (electric power steering) is large and the controller must select a more expensive power device, resulting in an increase in cost. The power device generates heat seriously, requires a higher heat dissipation design, and also causes the cost to be increased. When designing and manufacturing the motor, the motor has to use thicker wires and busbars (busbars) with better performance, which increases the difficulty of production and manufacturing and the cost of the motor.

Therefore, according to the related art, it is intended to solve the problems of the conventional EPS (electric power steering system) by improving the EPS (electric power steering system), boosting the output voltage capability of the inverter, and reducing the motor phase current.

Disclosure of Invention

The utility model discloses an overcome prior art not enough, provide a EPS motor control system, increased one-level DCDC boost converter between battery and DC-to-ac converter, the core effect promotes the input voltage of DC-to-ac converter, increases the output voltage of DC-to-ac converter then.

In order to realize the above purpose, an EPS motor control system is designed, which comprises a power circuit, a control circuit, a steering mechanism and an upper computer, and is characterized in that: the power circuit comprises a storage battery, a DC/DC booster circuit, an inverter and a motor, wherein the DC/DC booster circuit is connected between the storage battery and the inverter, and the electrical output end of the inverter is connected with the electrical input end of the motor; the control circuit is electrically connected with the power circuit and the upper computer respectively; and the steering mechanism is mechanically connected with an output shaft of the motor.

The U + end of the storage battery is connected with the Udc _ in + end of the DC/DC booster circuit, the U-end of the storage battery is connected with the Udc _ in-end of the DC/DC booster circuit, the Udc _ out + end of the DC/DC booster circuit is connected with the Uinv _ in + end of the inverter, the Udc _ out-end of the DC/DC booster circuit is connected with the Uinv _ in-end of the inverter, and the Uinv _ out1 end, the Uinv _ out2 end and the Uinv _ out3 end of the inverter are respectively connected with the U1 end, the V1 end and the W1 end of the motor.

The U + end and the U-end of the storage battery are the anode and the cathode of the storage battery; and the U1 end, the V1 end and the W1 end of the motor are respectively an electrical interface corresponding to each phase winding of the motor and the inverter.

The motor is one of a three-phase motor, a six-phase motor and a twelve-phase motor.

And 1 DC/DC booster circuit and 1 inverter are connected between the three-phase motor and the storage battery.

And 1 DC/DC booster circuit and 2 inverters are connected between the six-phase motor and the storage battery.

And 2 DC/DC booster circuits and 2 inverters are connected between the six-phase motor and the storage battery.

And 1 DC/DC booster circuit and 4 inverters are connected between the twelve-phase motor and the storage battery.

2 DC/DC booster circuits and 4 inverters are connected between the twelve-phase motor and the storage battery.

And 4 DC/DC booster circuits and 4 inverters are connected between the twelve-phase motor and the storage battery.

Compared with the prior art, the utility model, a EPS motor control system is provided, the one-level DC boost converter has been increased between battery and DC-to-ac converter, and the core effect promotes the input voltage of DC-to-ac converter, increases the output voltage of DC-to-ac converter then.

The motor is redesigned according to the new control system. The motor performance does not change but the phase current requirements are significantly reduced. The design difficulty, the production and manufacturing difficulty and the cost of the new motor are greatly reduced. The phase current is reduced, the selection of power devices in the inverter can be properly reduced, the cost is reduced, and the heat dissipation cost can be obviously reduced. The novel EPS (electric power steering) can simplify the difficulty of motor design and system matching and debugging, and can effectively overcome the motor performance fluctuation caused by the voltage fluctuation of a storage battery to improve the driving experience.

Drawings

Fig. 1 is a conventional EPS circuit connection diagram.

Fig. 2 is the EPS circuit connection diagram of the present invention.

Fig. 3 is a schematic diagram of the circuit connection of the three-phase motor in the power circuit of the present invention.

Fig. 4 is a schematic diagram of a first circuit connection of a six-phase motor in the power circuit of the present invention.

Fig. 5 is a schematic diagram of a second circuit connection of a six-phase motor in the power circuit of the present invention.

Fig. 6 is a schematic diagram of a first circuit connection of a twelve-phase motor in the power circuit of the present invention.

Fig. 7 is a schematic diagram of a second circuit connection of a twelve-phase motor in the power circuit of the present invention.

Fig. 8 is a schematic diagram of a third circuit connection of a twelve-phase motor in the power circuit of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1, it is a conventional EPS (electric power steering) system, its power supply comes from a vehicle-mounted 12V power supply, the motor features low voltage and large current, and the motor performance is very sensitive to the input phase voltage. When the load is large, the voltage drop of the power supply can cause the output phase voltage of the inverter to be reduced, the maximum output torque of the motor at high rotating speed can be obviously reduced, and the driving experience is further influenced. The current of a conventional EPS (electric power steering) is large, and the controller must select a more expensive power device, resulting in an increase in cost. The power device generates heat severely, requires a higher heat dissipation design, and also causes cost increase. When designing and manufacturing the motor, the motor has to use thicker wires and busbars (busbars) with better performance, which increases the difficulty of production and manufacturing and the cost of the motor.

As shown in fig. 2, the power circuit includes a storage battery, a DC/DC boost circuit, an inverter, and a motor, the DC/DC boost circuit is connected between the storage battery and the inverter, and an electrical output terminal of the inverter is connected to an electrical input terminal of the motor; the control circuit is electrically connected with the power circuit and the upper computer respectively; and the steering mechanism is mechanically connected with an output shaft of the motor. A torque sensor of the steering mechanism detects the torque and position signals of a steering wheel and transmits the torque and position signals to the upper computer; the upper computer receives the torque and position information of the steering wheel detected by the torque sensor and sends a torque instruction of the motor to the control circuit by combining the vehicle speed and the calibration; the control circuit respectively sends driving signals to the DC/DC booster circuit and a power device in the inverter according to the detected voltage/current information of the DC/DC booster circuit, the detected current information of the inverter, the detected position signal of the motor and the detected torque instruction of the upper computer so as to control the working state of the power circuit and further control the motor to operate, judges whether a system has faults or not in real time and sends fault information to the upper computer in time.

As shown in fig. 3, the U + terminal of the storage battery is connected to the Udc _ in + terminal of the DC/DC boost circuit, the U-terminal of the storage battery is connected to the Udc _ in-terminal of the DC/DC boost circuit, the Udc _ out + terminal of the DC/DC boost circuit is connected to the Uinv _ in + terminal of the inverter, the Udc _ out-terminal of the DC/DC boost circuit is connected to the Uinv _ in-terminal of the inverter, and the Uinv _ out1 terminal, uinv _ out2 terminal and Uinv _ out3 terminal of the inverter are respectively connected to the U1 terminal, V1 terminal and W1 terminal of the motor.

As shown in fig. 4, 1 DC/DC boost circuit and 2 inverters are connected between the six-phase motor and the battery. The Udc _ out + end of the DC/DC booster circuit is divided into two paths and is respectively connected with the Uinva _ in + end of the inverter A and the Uinvb _ in + end of the inverter B; the Udc _ out-end of the DC/DC booster circuit is divided into two paths and is respectively connected with the Uinva _ in-end of the inverter A and the Uinvb _ in-end of the inverter B; the Uinva _ out1 end, the Uinva _ out2 end and the Uinva _ out3 end of the inverter A are respectively connected with the U1 end, the V1 end and the W1 end of the motor; the terminal Uinvb _ out1, the terminal Uinvb _ out2 and the terminal Uinvb _ out3 of the inverter B are respectively connected with the terminal U2, the terminal V2 and the terminal W2 of the motor.

As shown in fig. 5, 2 DC/DC boost circuits and 2 inverters are connected between the six-phase motor and the battery. The U + end of the storage battery is divided into two paths and is respectively connected with the Udca _ in + end of the DC/DC booster circuit A and the Udcb _ in + end of the DC/DC booster circuit B, and the U-end of the storage battery is divided into two paths and is respectively connected with the Udca _ in-end of the DC/DC booster circuit A and the Udcb _ in-end of the DC/DC booster circuit B; the Udca _ out + end of the DC/DC booster circuit A is connected with the Uinva _ in + end of the inverter A, and the Udca _ out-end of the DC/DC booster circuit A is connected with the Uinva _ in-end of the inverter A; the Udcb _ out + end of the DC/DC booster circuit B is connected with the Uinvb _ in + end of the inverter B, and the Udcb _ out-end of the DC/DC booster circuit B is connected with the Uinvb _ in-end of the inverter B; the Uinva _ out1 end, the Uinva _ out2 end and the Uinva _ out3 end of the inverter A are connected with the U1 end, the V1 end and the W1 end of the motor; the terminal Uinvb _ out1, the terminal Uinvb _ out2 and the terminal Uinvb _ out3 of the inverter B are respectively connected with the terminal U2, the terminal V2 and the terminal W2 of the motor.

As shown in fig. 6, 1 DC/DC boost circuit and 4 inverters are connected between the twelve-phase motor and the battery. The Udc _ out + end of the DC/DC booster circuit is divided into four paths, and is respectively connected with the Uinva _ in + end of the inverter A, the Uinvb _ in + end of the inverter B, the Uinvc _ in + end of the inverter C and the Uinvd _ in + end of the inverter D; the Udc _ out-end of the DC/DC booster circuit is divided into four paths which are respectively connected with the Uinva _ in-end of the inverter A, the Uinvb _ in-end of the inverter B, the Uinvc _ in-end of the inverter C and the Uinvd _ in-end of the inverter D; the Uinva _ out1 end, the Uinva _ out2 end and the Uinva _ out3 end of the inverter A are respectively connected with the U1 end, the V1 end and the W1 end of the motor; the Uinvb _ out1 end, the Uinvb _ out2 end and the Uinvb _ out3 end of the inverter B are respectively connected with the U2 end, the V2 end and the W2 end of the motor; the Uinvc _ out1 end, the Uinvc _ out2 end and the Uinvc _ out3 end of the inverter C are respectively connected with the U3 end, the V3 end and the W3 end of the motor; the terminal Unvvd _ out1, the terminal Unvvd _ out2, and the terminal Unvvd _ out3 of the inverter D are connected to the terminal U4, the terminal V4, and the terminal W4 of the motor, respectively.

As shown in fig. 7, 2 DC/DC boost circuits and 4 inverters are connected between the twelve-phase motor and the battery. The U + end of the storage battery is divided into two paths and is respectively connected with the Udca _ in + end of the DC/DC booster circuit A and the Udcb _ in + end of the DC/DC booster circuit B, and the U-end of the storage battery is divided into two paths and is respectively connected with the Udca _ in-end of the DC/DC booster circuit A and the Udcb _ in-end of the DC/DC booster circuit B; the Udca _ out + end of the DC/DC booster circuit A is divided into two paths which are respectively connected with the Uinva _ in + end of the inverter A and the Uinvb _ in + end of the inverter B; the Udca _ out-end of the DC/DC booster circuit A is divided into two paths which are respectively connected with the Uinva _ in-end of the inverter A and the Uinvb _ in-end of the inverter B; the Udcb _ out + end of the DC/DC booster circuit B is divided into two paths which are respectively connected with the Uinvc _ in + end of the inverter C and the Uinvc _ in + end of the inverter C; the Udcb _ out-end of the DC/DC booster circuit B is divided into two paths which are respectively connected with the Uinvd _ in-end of the inverter D and the Uinvd _ in-end of the inverter D; the Uinva _ out1 end, the Uinva _ out2 end and the Uinva _ out3 end of the inverter A are respectively connected with the U1 end, the V1 end and the W1 end of the motor; the Uinvb _ out1 end, the Uinvb _ out2 end and the Uinvb _ out3 end of the inverter B are respectively connected with the U2 end, the V2 end and the W2 end of the motor; the terminal Unvvc _ out1, the terminal Unvvc _ out2 and the terminal Unvvc _ out3 of the inverter C are respectively connected with the terminal U3, the terminal V3 and the terminal W3 of the motor; the terminal Unvvd _ out1, the terminal Unvvd _ out2, and the terminal Unvvd _ out3 of the inverter D are connected to the terminal U4, the terminal V4, and the terminal W4 of the motor, respectively.

As shown in fig. 8, 4 DC/DC boost circuits and 4 inverters are connected between the twelve-phase motor and the battery. The U + end of the storage battery is divided into four paths which are respectively connected with an Udca _ in + end of the DC/DC booster circuit A, an Udcb _ in + end of the DC/DC booster circuit B, an Udcc _ in + end of the DC/DC booster circuit C and an Udcd _ in + end of the DC/DC booster circuit D; the Udca _ out + end of the DC/DC booster circuit A is connected with the Uinva _ in + end of the inverter A, and the Udca _ out-end of the DC/DC booster circuit A is connected with the Uinva _ in-end of the inverter A; the Udcb _ out + end of the DC/DC booster circuit B is connected with the Uinvb _ in + end of the inverter B, and the Udcb _ out-end of the DC/DC booster circuit B is connected with the Uinvb _ in-end of the inverter B; the Udcc _ out + end of the DC/DC booster circuit C is connected with the Uinvc _ in + end of the inverter C, and the Udcc _ out-end of the DC/DC booster circuit C is connected with the Uinvc _ in-end of the inverter C; the Udcd _ out + end of the DC/DC booster circuit D is connected with the Uinvd _ in + end of the inverter D, and the Udcd _ out-end of the DC/DC booster circuit D is connected with the Uinvd _ in-end of the inverter D; the Uinva _ out1 end, the Uinva _ out2 end and the Uinva _ out3 end of the inverter A are respectively connected with the U1 end, the V1 end and the W1 end of the motor; the terminal Uinvb _ out1, the terminal Uinvb _ out2 and the terminal Uinvb _ out3 of the inverter B are respectively connected with the terminal U2, the terminal V2 and the terminal W2 of the motor; the Uinvc _ out1 end, the Uinvc _ out2 end and the Uinvc _ out3 end of the inverter C are respectively connected with the U3 end, the V3 end and the W3 end of the motor; the end Uinvd _ out1, the end Uinvd _ out2 and the end Uinvd _ out3 of the inverter D are respectively connected with the end U4, the end V4 and the end W4 of the motor.

Adopt this the utility model discloses control system, motor design simplifies, and the cost is lower. The motor performance fluctuation caused by the voltage fluctuation of the storage battery can be overcome to the maximum extent, the EPS steering hand feeling is improved, and the customer experience is improved.

Claims

1. The utility model provides a EPS motor control system, includes power circuit, control circuit, steering mechanism, host computer, its characterized in that: the power circuit comprises a storage battery, a DC/DC booster circuit, an inverter and a motor, wherein the DC/DC booster circuit is connected between the storage battery and the inverter, and the electrical output end of the inverter is connected with the electrical input end of the motor; the control circuit is electrically connected with the power circuit and the upper computer respectively; and the steering mechanism is mechanically connected with an output shaft of the motor.

2. The EPS motor control system according to claim 1, characterized in that: the U + end of the storage battery is connected with the Udc _ in + end of the DC/DC booster circuit, the U-end of the storage battery is connected with the Udc _ in-end of the DC/DC booster circuit, the Udc _ out + end of the DC/DC booster circuit is connected with the Uinv _ in + end of the inverter, the Udc _ out-end of the DC/DC booster circuit is connected with the Uinv _ in-end of the inverter, and the Uinv _ out1 end, the Uinv _ out2 end and the Uinv _ out3 end of the inverter are respectively connected with the U1 end, the V1 end and the W1 end of the motor.

3. The EPS motor control system according to claim 2, characterized in that: the U + end and the U-end of the storage battery are the anode and the cathode of the storage battery; and the U1 end, the V1 end and the W1 end of the motor are respectively an electrical interface corresponding to each phase winding of the motor and the inverter.

4. An EPS motor control system according to claim 1 or 2, characterized in that: the motor is one of a three-phase motor, a six-phase motor and a twelve-phase motor.

5. The EPS motor control system of claim 4, wherein: and 1 DC/DC booster circuit and 1 inverter are connected between the three-phase motor and the storage battery.

6. The EPS motor control system according to claim 4, characterized in that: and 1 DC/DC booster circuit and 2 inverters are connected between the six-phase motor and the storage battery.

7. The EPS motor control system according to claim 4, characterized in that: and 2 DC/DC booster circuits and 2 inverters are connected between the six-phase motor and the storage battery.

8. The EPS motor control system according to claim 4, characterized in that: and 1 DC/DC booster circuit and 4 inverters are connected between the twelve-phase motor and the storage battery.

9. The EPS motor control system according to claim 4, characterized in that: 2 DC/DC booster circuits and 4 inverters are connected between the twelve-phase motor and the storage battery.

10. The EPS motor control system of claim 4, wherein: and 4 DC/DC booster circuits and 4 inverters are connected between the twelve-phase motor and the storage battery.