A power supply detection system and method for a vehicle-mounted motor controller

Abstract

The present invention provides a power detection system and method for an in-vehicle motor controller, including an input power supply; a power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit; the power management chip SBC is electrically connected to the CPU and on-board electrical equipment; the on-board non-isolated power supply unit is electrically connected to the on-board electrical equipment and the drive chip; the on-board isolated power supply unit is electrically connected to the drive chip; when the voltage of the power input is lower than the voltage threshold and then recovers, the CPU reads the configuration information and fault information of the drive chip; when the configuration information is lost, the power supply of the on-board non-isolated power supply unit has experienced an abnormality; when the configuration information exists and the fault information records a communication fault, the power supply of the on-board isolated power supply unit has experienced an abnormality; when the configuration information is lost and the fault information records a communication fault, the power supply of the on-board non-isolated power supply unit has experienced an abnormality, and the power supply of the on-board isolated power supply unit has experienced an abnormality. In the case of limited hardware resources, the location of the undervoltage fault can be determined.

Description

Technical Field

[0001] The present invention relates to the field of motor control, and in particular, to a power supply detection system and method for an in-vehicle motor controller. Background Art

[0002] With the rapid development of new energy vehicles, the equipment management of the upstream and downstream of new energy vehicles has all developed rapidly. Among them, the fault judgment of the in-vehicle motor controller is also one of the links.

[0003] During the driving process of a new energy vehicle, when the voltage of the vehicle's low-voltage power supply (low-voltage battery / DCDC output) is low and the vehicle's power supply equipment suddenly needs to draw a large low-voltage supply current, the low-voltage supply voltage will generate a depression lower than the normal operating voltage. This will cause the low-voltage power supply system of the motor controller connected to this power supply to operate abnormally, resulting in the situation that the CPU does not completely lose power, but other chips lose power, and the configuration of the intelligent chip is lost or the IO state is abnormal. After the battery supply voltage is restored, the intelligent chip cannot work normally, and the motor controller reports a fault.

[0004] Therefore, in order to make the motor controller not report abnormal faults and be able to operate normally after the low-voltage power supply returns to normal, it becomes particularly important to identify the abnormality of the low-voltage power supply. Since the current consumption of the low-voltage power supply is different in different working states of the motor controller, it is not possible to simply detect the input power supply voltage to determine whether the chip state on the electronic control board is working properly.

[0005] Therefore, a new power supply detection system and method for an in-vehicle motor controller are needed, which can quickly determine the specific location of the undervoltage fault and save resource costs. Summary of the Invention

[0006] In order to overcome the above technical defects, the purpose of the present invention is to provide a power supply detection system and method for an in-vehicle motor controller, which can determine the location of the undervoltage fault under the condition of limited hardware resources.

[0007] The present invention discloses a power supply detection system for an in-vehicle motor controller. The power supply detection system includes:

[0008] An input power supply, providing the power input for the motor controller;

[0009] A power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit arranged in parallel, which are respectively connected to the input power supply to receive power supply electrical energy;

[0010] The power management chip SBC is electrically connected to the CPU and on-board electrical equipment to supply power to the CPU and on-board electrical equipment;

[0011] The on-board non-isolated power supply unit is electrically connected to the on-board electrical equipment and the drive chip to supply power to the on-board electrical equipment and the drive chip;

[0012] The on-board isolated power supply unit is electrically connected to the drive chip to supply power to the drive chip;

[0013] When the voltage of the power input is lower than the first voltage threshold and then returns to a voltage value greater than or equal to the second voltage threshold, the CPU reads the configuration information and fault information of the drive chip;

[0014] When the configuration information is lost, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit;

[0015] When the configuration information exists and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board isolated power supply unit;

[0016] When the configuration information is lost and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit and an abnormality has occurred in the power supply of the on-board isolated power supply unit.

[0017] Preferably, the on-board non-isolated power supply unit is electrically connected to the primary side of the drive chip;

[0018] The on-board isolated power supply unit is electrically connected to the secondary side of the drive chip.

[0019] Preferably, the pin of the power management chip SBC is electrically connected to the CPU, and the power management chip SBC monitors its own voltage output state. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold, the power management chip SBC outputs a reset signal to the CPU to reset the CPU.

[0020] Preferably, when the CPU detects that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal, the CPU determines that an abnormality has occurred in the secondary side power supply of the drive chip;

[0021] When the CPU detects that the on-board electrical equipment has an abnormality at the same time, the CPU determines that an abnormality has occurred in the on-board non-isolated power supply unit.

[0022] Preferably, when the CPU detects that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC;

[0023] When the CPU detects that the drive bridge arm state, resolver state and overcurrent state of the motor all indicate faults and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC.

[0024] The present invention also discloses a power supply detection method for a vehicle-mounted motor controller, including the following steps:

[0025] Configure a power supply detection system, including: an input power supply providing the power input for the motor controller; a power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit arranged in parallel and respectively connected to the input power supply to receive the supplied electric energy; the power management chip SBC is electrically connected to the CPU and the on-board electrical equipment to supply power to the CPU and the on-board electrical equipment; the on-board non-isolated power supply unit is electrically connected to the on-board electrical equipment and the drive chip to supply power to the on-board electrical equipment and the drive chip; the on-board isolated power supply unit is electrically connected to the drive chip to supply power to the drive chip;

[0026] When the voltage of the power input is lower than the first voltage threshold and then returns to a voltage value greater than or equal to the second voltage threshold, the CPU reads the configuration information and fault information of the drive chip;

[0027] When the configuration information is lost, the CPU determines that the power supply of the on-board non-isolated power supply unit has been abnormal;

[0028] When the configuration information exists and the fault information records a communication fault, the CPU determines that the power supply of the on-board isolated power supply unit has been abnormal;

[0029] When the configuration information is lost and the fault information records a communication fault, the CPU determines that the power supply of the on-board non-isolated power supply unit has been abnormal and the power supply of the on-board isolated power supply unit has been abnormal.

[0030] Preferably, the on-board non-isolated power supply unit is electrically connected to the primary side of the drive chip;

[0031] The on-board isolated power supply unit is electrically connected to the secondary side of the drive chip.

[0032] Preferably, the pin of the power management chip SBC is electrically connected to the CPU, and the power management chip SBC monitors its own voltage output state. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold, the power management chip SBC outputs a reset signal to the CPU to reset the CPU.

[0033] Preferably, when the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal, the CPU determines that the secondary side power supply of the drive chip has been abnormal;

[0034] When the CPU monitors that the on-board electrical equipment is simultaneously abnormal, the CPU determines that the on-board non-isolated power supply unit has been abnormal..

[0035] Preferably, when the CPU detects that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal, and there is an internal power failure in the vehicle-mounted motor controller, the CPU determines that the power management chip SBC has experienced an abnormality;

[0036] When the CPU detects that on-board electrical devices are simultaneously abnormal, and there is an internal power failure in the vehicle-mounted motor controller, the CPU determines that the power management chip SBC has experienced an abnormality.

[0037] After adopting the above technical solution, compared with the prior art, it has the following beneficial effects:

[0038] 1. In occasions with limited hardware resources and high cost requirements, it can quickly determine whether an undervoltage fault has occurred and the location where it occurred, saving resource costs;

[0039] 2. The detection accuracy is high, providing support for the driving safety of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of a power detection system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The advantages of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments.

[0042] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0043] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the", and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0044] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation of the present invention.

[0046] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or may be the communication inside two elements, may be directly connected, or may be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0047] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of the description of the present invention, and they do not have a specific meaning in themselves. Therefore, "module" and "component" may be used interchangeably.

[0048] Refer to Figure 1, which shows the power supply detection system of an in-vehicle motor controller in a preferred embodiment of the present invention. The power supply architecture included in the power supply detection system is divided into: an input power supply, electrically connected to the motor controller, providing the power supply input of the motor controller; a power management chip SBC, electrically connected to the CPU, supplying power to the CPU, with a supply voltage of 5V / 3.3V, forming a first power supply circuit; an on-board non-isolated power supply unit, which is powered by non-CPU on the board (i.e., the power supply circuit is not provided by the CPU on the on-board non-isolated power supply unit). After forming a second power supply circuit, the supply voltage of the non-CPU power supply on the board is higher than the voltage of the first power supply circuit; an on-board isolated power supply unit, connected to the drive chip, used to supply power to the secondary side of the drive chip, which serves as a third power supply circuit. It should be understood that the third power supply circuit needs to be physically isolated from the above-mentioned first and second power supply circuits. The above-mentioned first, second, and third power supply circuits are all connected to the input power supply. After receiving the supply electrical energy, they supply power to the connected electrical equipment respectively. That is to say, on the power consumption side of the first, second, and third power supply circuits, there are a CPU, on-board electrical equipment (including but not limited to: CAN bus, resolver circuit, amplifier circuit, comparison circuit, etc.) and a drive chip. The power management chip SBC is electrically connected to the CPU and on-board electrical equipment, and supplies power to the CPU and on-board electrical equipment at the same time; the on-board non-isolated power supply unit is electrically connected to the on-board electrical equipment and the primary side of the drive chip, and supplies power to the on-board electrical equipment and the drive chip at the same time; the on-board isolated power supply unit is electrically connected to the secondary side of the drive chip to supply power to the drive chip.

[0049] When the vehicle power supply equipment needs to suddenly draw a large low-voltage supply current, the power supply input provided by the input power supply will have a depression lower than the normal operating voltage (i.e., the first voltage threshold). After the power supply input recovers, when the power supply input returns to a voltage value greater than or equal to the second voltage threshold (the hysteresis interval above the first voltage threshold), the power-off situation of the device caused during the depression is unknown. In this regard, the CPU is configured to, when the above situation occurs (the judgment condition is: the supply voltage of the CPU decreases but does not completely power off), the CPU will indirectly read the configuration information and fault information of the drive chip (including its own faults, and the information stored or transferred to the drive chip when the IGBT has a fault) by means of the on-board electrical equipment. When the CPU finds that the configuration information is lost (i.e., the configuration information of the drive chip read does not match the previously written information), the CPU judges that an abnormality such as power-off has occurred in the power supply of the on-board non-isolated power supply unit (the second power supply circuit); and when the configuration information exists and the fault information records a communication fault during the depression, the CPU judges that an abnormality has occurred in the power supply of the on-board isolated power supply unit (the third power supply circuit); and when the configuration information is lost and the fault information records a communication fault, the CPU judges that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit, and an abnormality has occurred in the power supply of the on-board isolated power supply unit (i.e., both the second power supply circuit and the third power supply circuit have powered off).

[0050] Through the above configuration, without adding any new components or modules, the occurrence and location of power-off situations can be quickly determined in a low-cost manner, which can not only save resource costs but also obtain accurate detection results.

[0051] In a preferred embodiment, the pins of the power management chip SBC are electrically connected to the CPU, and the power management chip SBC monitors its own voltage output status. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold (such as 20%, 15%, 10%, etc.), the power management chip SBC outputs a reset signal to the CPU to reset the CPU. By monitoring the CPU voltage status through the power management chip SBC, in the case where the CPU loses power and cannot work, the CPU can be restarted to complete the monitoring of other power supply circuits.

[0052] In a preferred embodiment, to further ensure the accuracy of the detection results, the occurrence and location of faults can also be determined by combining conditions. Specifically, when the CPU detects that the IGBT temperature sampling and bus voltage sampling functions implemented by the driver chip are both abnormal, the CPU determines that an abnormality has occurred in the secondary power supply of the driver chip located at the control source; and when the CPU detects that the drive bridge arm status of the motor, the resolver status of the motor, and the overcurrent status all indicate faults at the same time, the CPU determines that an abnormality has occurred in the on-board non-isolated power supply unit located at the control source. Thus, the above judgment results can be effectively verified by the conditions of the end-use equipment, achieving the effect of secondary verification.

[0053] Furthermore, if the CPU detects that the IGBT temperature sampling and bus voltage sampling functions implemented by the driver chip are both abnormal, and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC; when the CPU detects that on-board electrical equipment, such as the drive bridge arm status of the motor, the resolver status of the motor, and the overcurrent status, all occur abnormally at the same time, and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that the power management chip SBC has had an abnormality.

[0054] The present invention also discloses a power supply detection method for a vehicle-mounted motor controller, which includes the following steps: configuring a power supply detection system, including: an input power supply for providing the power input of the motor controller; a power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit arranged in parallel and respectively connected to the input power supply to receive the supplied electric energy; the power management chip SBC is electrically connected to the CPU and the on-board electrical equipment to supply power to the CPU and the on-board electrical equipment; the on-board non-isolated power supply unit is electrically connected to the on-board electrical equipment and the drive chip to supply power to the on-board electrical equipment and the drive chip; the on-board isolated power supply unit is electrically connected to the drive chip to supply power to the drive chip; when the voltage of the power input is lower than the first voltage threshold and then returns to a voltage value greater than or equal to the second voltage threshold, the CPU reads the configuration information and fault information of the drive chip; when the configuration information is lost, the CPU determines that the power supply of the on-board non-isolated power supply unit has had an abnormality; when the configuration information exists and the fault information records a communication fault, the CPU determines that the power supply of the on-board isolated power supply unit has had an abnormality; when the configuration information is lost and the fault information records a communication fault, the CPU determines that the power supply of the on-board non-isolated power supply unit has had an abnormality, and the power supply of the on-board isolated power supply unit has had an abnormality.

[0055] Preferably, the on-board non-isolated power supply unit is electrically connected to the primary side of the drive chip; the on-board isolated power supply unit is electrically connected to the secondary side of the drive chip.

[0056] Preferably, the pin of the power management chip SBC is electrically connected to the CPU, and the power management chip SBC monitors its own voltage output state. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold, the power management chip SBC outputs a reset signal to the CPU to reset the CPU.

[0057] Preferably, when the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal at the same time, the CPU determines that the secondary side power supply of the drive chip has had an abnormality; when the CPU monitors that the on-board electrical equipment has an abnormality at the same time, the CPU determines that the on-board non-isolated power supply unit has had an abnormality.

[0058] Preferably, when the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal at the same time, and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that the power management chip SBC has had an abnormality; when the CPU monitors that the on-board electrical equipment has an abnormality at the same time, and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that the power management chip SBC has had an abnormality.

[0059] It should be noted that the embodiments of the present invention have better implementability and do not impose any form of limitation on the present invention. Any person skilled in the art may use the technical content disclosed above to modify or transform it into equivalent effective embodiments. However, as long as it does not depart from the technical solution of the present invention, any modification, equivalent change or modification made to the above embodiments based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A power detection system for a vehicle-mounted motor controller, characterized in that The power supply detection system includes: An input power supply that provides the power input for the motor controller; A power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit that are arranged in parallel and are respectively connected to the input power supply to receive the supplied electrical energy; The power management chip SBC is electrically connected to the CPU and on-board electrical devices to supply power to the CPU and on-board electrical devices; The on-board non-isolated power supply unit is electrically connected to the on-board electrical devices and the drive chip to supply power to the on-board electrical devices and the drive chip; The on-board isolated power supply unit is electrically connected to the drive chip to supply power to the drive chip; The on-board non-isolated power supply unit is electrically connected to the primary side of the drive chip; The on-board isolated power supply unit is electrically connected to the secondary side of the drive chip; When the voltage of the power input is lower than the first voltage threshold and then returns to a voltage value greater than or equal to the second voltage threshold, the CPU reads the configuration information and fault information of the drive chip; When the configuration information is lost, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit; When the configuration information exists and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board isolated power supply unit; When the configuration information is lost and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit and an abnormality has occurred in the power supply of the on-board isolated power supply unit.

2. The power supply detection system according to claim 1, wherein: The pin of the power management chip SBC is electrically connected to the CPU, and the power management chip SBC monitors its own voltage output state. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold, the power management chip SBC outputs a reset signal to the CPU to reset the CPU.

3. The power supply detection system according to claim 1, wherein: When the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal, the CPU determines that an abnormality has occurred in the secondary side power supply of the drive chip; When the CPU monitors that abnormalities occur in the on-board electrical devices at the same time, the CPU determines that an abnormality has occurred in the on-board non-isolated power supply unit.

4. The power supply detection system according to claim 3, wherein: When the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are both abnormal and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC; When the CPU monitors that abnormalities occur in the on-board electrical devices at the same time and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC.

5. A power supply detection method for a vehicle-mounted motor controller, characterized in that, It includes the following steps: Configure a power detection system, including: an input power supply that provides the power input for the motor controller; a power management chip SBC, an on-board non-isolated power supply unit, and an on-board isolated power supply unit arranged in parallel, which are respectively connected to the input power supply to receive the supplied electrical energy; the power management chip SBC is electrically connected to the CPU and on-board electrical devices to supply power to the CPU and on-board electrical devices; the on-board non-isolated power supply unit is electrically connected to the on-board electrical devices and the drive chip to supply power to the on-board electrical devices and the drive chip; the on-board isolated power supply unit is electrically connected to the drive chip to supply power to the drive chip; The on-board non-isolated power supply unit is electrically connected to the primary side of the drive chip; The on-board isolated power supply unit is electrically connected to the secondary side of the drive chip; When the voltage of the power input is lower than the first voltage threshold and then returns to a voltage value greater than or equal to the second voltage threshold, the CPU reads the configuration information and fault information of the drive chip; When the configuration information is lost, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit; When the configuration information exists and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board isolated power supply unit; When the configuration information is lost and the fault information records a communication fault, the CPU determines that an abnormality has occurred in the power supply of the on-board non-isolated power supply unit and an abnormality has occurred in the power supply of the on-board isolated power supply unit.

6. The power detection method according to claim 5, wherein, The pin of the power management chip SBC is electrically connected to the CPU, and the power management chip SBC monitors its own voltage output state. When the voltage fluctuation range of the power output of the power management chip SBC exceeds a preset percentage of a voltage range threshold, the power management chip SBC outputs a reset signal to the CPU to reset the CPU.

7. The power detection method according to claim 5, wherein, When the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are simultaneously abnormal, the CPU determines that an abnormality has occurred in the secondary side power supply of the drive chip; When the CPU monitors that the on-board electrical devices are simultaneously abnormal, the CPU determines that an abnormality has occurred in the on-board non-isolated power supply unit.

8. The power detection method according to claim 7, wherein, When the CPU monitors that the IGBT temperature sampling and bus voltage sampling functions implemented by the drive chip are simultaneously abnormal and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC; When the CPU monitors that the on-board electrical devices are simultaneously abnormal and there is an internal power supply fault in the vehicle-mounted motor controller, the CPU determines that an abnormality has occurred in the power management chip SBC.

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