Oil pump motor controller suitable for vehicle hybrid power system

Abstract

The utility model provides an oil pump motor controller suitable for a vehicle hybrid power system, comprising an OPC main control board, an IGBT driving board, a pre-charging relay and a three-phase half bridge constructed by six IGBTs, the main control board and the driving board are directly connected through a wire harness; the OPC main control board comprises a CPU control unit, a CAN communication module, a level conversion module, a temperature acquisition module, a high-voltage signal acquisition module, a HALL current acquisition module, a power supply module and a peripheral interface. The CPU control unit is connected with the CAN communication module, the level conversion module, the temperature acquisition module, the high-voltage signal acquisition module and the HALL current acquisition module, and the power supply module is used for supplying power to the OPC main control board. The controller provided by the utility model is simple in hardware circuit, small in calculation amount, low in position estimation error, good in special working condition heavy load starting and sudden load increasing and decreasing test, and easy to realize.

Description

Technical Field

[0001] The utility model belongs to the field of automation technology, and in particular relates to an oil pump motor controller suitable for a hybrid power system for a vehicle. Background Art

[0002] The current development trend of power components for hybrid light trucks and pickup trucks is the powertrain (PEU), that is, the motor controller, DC / DC, and oil pump motor controller are integrated into one controller. In order to reduce the control lines and improve the hardware stability, the oil pump motor is a position sensorless permanent magnet synchronous motor (PMSM). At present, domestic PEUs are all in the experimental design stage. According to the characteristics of the positionless motor and special operating conditions, this scheme designs an oil pump motor controller (OPC) to stir the lubricating oil and spray it into the inner cavity of the drive motor assembly to play a role in lubrication and heat dissipation. Summary of the invention

[0003] In view of this, the utility model aims to overcome the deficiencies of the above-mentioned problems in the prior art and proposes an oil pump motor controller suitable for a hybrid power system for a vehicle.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An oil pump motor controller suitable for a hybrid power system for a vehicle, comprising an OPC main control board, an IGBT drive board, a pre-charge relay, and a three-phase half-bridge constructed by six IGBTs, wherein the main control board and the drive board are directly connected through a wiring harness;

[0006] The OPC main control board includes a CPU control unit, a CAN communication module, a level conversion module, a temperature acquisition module, a high-voltage signal acquisition module, a HALL current acquisition module, a power supply module and a peripheral interface; the CPU control unit is connected to the CAN communication module, the level conversion module, the temperature acquisition module, the high-voltage signal acquisition module, and the HALL current acquisition module, and the power supply module is used to supply power to the OPC main control board.

[0007] Furthermore, the CPU control unit adopts an STM32F103 single-chip microcomputer, a program download mode of a serial debugging interface, an external passive clock of 8MHZ in a startup mode, and an internal frequency multiplication of 72MHZ.

[0008] Furthermore, the level conversion module is used to convert the level from 3.3V to 5V through the level conversion chip SN74LVC8T245. When the controller has overcurrent or overvoltage, it is necessary to quickly block the enable signal of the level conversion chip SN74LVC8T245 to achieve a fault self-locking function.

[0009] Furthermore, the high-voltage signal acquisition module adopts resistor voltage division, isolation amplifier differential transmission and anti-overshoot conditioning circuit.

[0010] Furthermore, the OPC main control board and the IGBT driver board transmit 6-channel PWM signals and IGBT fault signals via connecting power strips.

[0011] Compared with the prior art, the oil pump motor controller for a hybrid vehicle system described in the utility model has the following advantages:

[0012] The controller of the utility model has a simple hardware circuit, a small amount of calculation, and a low position estimation error. It is well tested for special working conditions such as heavy-load starting and sudden load increase and decrease, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0014] Figure 1 This is an electrical structure block diagram of an oil pump motor controller suitable for a hybrid power system for a vehicle according to the utility model;

[0015] Figure 2 This is the hardware structure diagram of the OPC main control board of the utility model;

[0016] Figure 3 This is a circuit diagram of a level conversion module of the utility model;

[0017] Figure 4 This is the circuit diagram of the high voltage signal acquisition module of the utility model. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0019] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] like Figure 1 As shown, the utility model provides an oil pump motor controller suitable for a hybrid power system for a vehicle. The controller includes an OPC main control board, an IGBT drive board, a pre-charge relay, and a three-phase half-bridge constructed with six IGBTs. Figure 1 The DC / DC power supply, motor M and battery box shown are all OPC external circuits. Among them, the OPC main control board and IGBT driver board transmit 6-way PWM signals and IGBT fault signals through connecting socket cables.

[0023] like Figure 2 The figure shows the hardware wiring diagram of the OPC main control board. The OPC main control board includes a CPU control unit, a CAN communication module, a level conversion module, a temperature acquisition module, a high-voltage signal acquisition module, a HALL current acquisition module, and a power supply module.

[0024] Among them, the CPU control unit adopts STM32F103 microcontroller, serial debug interface program download mode, external passive clock 8MHZ in startup mode, and internal frequency multiplication 72MHZ;

[0025] Since the level of the PWM signal output by the MCU is 0-3.3V, it is necessary to convert the level from 3.3V to 5V through the level conversion chip SN74LVC8T245. When the controller has overcurrent or overvoltage, it is necessary to quickly block the enable signal of the level conversion chip SN74LVC8T245 to achieve the fault self-locking function. The specific design is as follows: First, the timer TIM1 of the STM32F103 has a break function, that is, a fault brake function. The Break function is mainly used for fast hardware protection functions, such as Figure 3 As shown, the break pin output signal of the MCU is connected to the SN74LVC1G126-Q1 chip 2 pin, and the 1 pin OE is also controlled by the microcontroller. After the program is initialized, the 1 pin is enabled. When a fault occurs, the break signal is low and the u19 output pin Y is low. According to the logical relationship of the SN74LVC1G00 chip, the u18 output PWM_ENABLE pin is high. This pin is connected to the enable pin OE of the level conversion chip SN74LVC8T245 to disable it (the enable pin is low and valid), and the fault self-locking is realized. It should be noted that the B pin of U18 is always high when the Y pin outputs a low level. The Y pin outputs a high level, so that the three-level pipeline is connected, and the U18B pin outputs a low level. When no fault occurs, both U19 input pins are high, and the two pins of U18 output a low level, enabling the level conversion chip, starting normal operation, and realizing normal driving function. Hardware blocking PWM is fast and can effectively protect the power circuit in the event of a fault and improve safety.

[0026] High voltage signal acquisition module circuit Figure 4 As shown in the figure, the scheme of acquisition is a circuit structure of "resistance voltage division-isolation-op amp conditioning", in which the six 750K resistors and R37, R38 collect 240-430V voltage input and divide it, and then output it to the high-precision op amp conditioning circuit through the isolation op amp ACPL-782T, and adjust the voltage to the range of 0-3.3 suitable for the AD input pin of the microcontroller. The VDN3BAV99 upper and lower voltage regulators can suppress the overshoot or undershoot caused by impedance mismatch to protect the microcontroller.

[0027] The utility model utilizes a temperature acquisition module to acquire the temperature of the IGBT and the motor, and a CPU control unit determines whether the real-time acquired data exceeds a set threshold value to perform fault judgment and realize autonomous protection.

[0028] The utility model utilizes a high-voltage signal acquisition module to collect bus voltage (voltage at both ends of the battery), and a CPU control unit determines whether the real-time collected data exceeds a set threshold to perform fault judgment and implement autonomous protection, that is, controls the switch of the IGBT drive signal.

[0029] The utility model utilizes the HALL current acquisition module to collect bus current (battery outflow current), and the CPU control unit determines whether the real-time collected data exceeds the set threshold value to make a fault judgment and realize autonomous protection, that is, controls the switch of the IGBT drive signal.

[0030] In order to reduce the control circuit and improve the hardware stability, the oil pump motor in the hybrid light truck is a position sensorless permanent magnet synchronous motor (PMSM). According to the characteristics of the positionless motor, the utility model designs an oil pump motor controller (OPC) to stir the lubricating oil and spray it into the inner cavity of the drive motor assembly to play a role in lubrication and heat dissipation. The hardware circuit of this controller is simple, the amount of calculation is small, the position estimation error is low, and it is easy to implement.

[0031] It should be noted that the temperature acquisition module, HALL current acquisition module and other functional modules not described in detail used in the present invention are all existing products and are not limited to specific models. The program design in the controller also belongs to the existing technology as long as the control can be achieved.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel pump motor controller suitable for a hybrid power system for a vehicle, characterized in that: It includes an OPC main control board, an IGBT driver board, a pre-charge relay, and a three-phase half-bridge built with six IGBTs, wherein the main control board and the driver board are directly connected through a wiring harness; The OPC main control board includes a CPU control unit, a CAN communication module, a level conversion module, a temperature acquisition module, a high-voltage signal acquisition module, a HALL current acquisition module, a power supply module and a peripheral interface; the CPU control unit is connected to the CAN communication module, the level conversion module, the temperature acquisition module, the high-voltage signal acquisition module, and the HALL current acquisition module, and the power supply module is used to supply power to the OPC main control board.

2. The oil pump motor controller suitable for a vehicle hybrid power system according to claim 1, characterized in that: The CPU control unit adopts STM32F103 microcontroller, program download mode of serial debugging interface, external passive clock 8MHZ in startup mode, and internal frequency multiplication 72MHZ.

3. The oil pump motor controller suitable for a vehicle hybrid power system according to claim 1, characterized in that: The level conversion module is used to convert the level from 3.3V to 5V through the level conversion chip SN74LVC8T245. When the controller has overcurrent or overvoltage, it is necessary to quickly block the enable signal of the level conversion chip SN74LVC8T245 to achieve a fault self-locking function.

4. The oil pump motor controller suitable for a vehicle hybrid power system according to claim 1, characterized in that: The high-voltage signal acquisition module adopts resistor voltage division, isolation amplifier differential transmission and anti-overshoot conditioning circuit.

5. The oil pump motor controller suitable for a vehicle hybrid power system according to claim 1, characterized in that: The OPC main control board and the IGBT driver board transmit 6-channel PWM signals and IGBT fault signals via connecting socket cables.

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