KR20210008971A - Control method of HEV corresponding to BMS power disconnection - Google Patents

Control method of HEV corresponding to BMS power disconnection Download PDF

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KR20210008971A
KR20210008971A KR1020190085048A KR20190085048A KR20210008971A KR 20210008971 A KR20210008971 A KR 20210008971A KR 1020190085048 A KR1020190085048 A KR 1020190085048A KR 20190085048 A KR20190085048 A KR 20190085048A KR 20210008971 A KR20210008971 A KR 20210008971A
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engine
vehicle
bms
battery
voltage
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KR102644580B1 (en
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김태진
최성원
노정원
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현대자동차주식회사
기아자동차주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/50—Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
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    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
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    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
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    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
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    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
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    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/181—Preparing for stopping
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    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/182—Selecting between different operative modes, e.g. comfort and performance modes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2250/00—Driver interactions
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The present invention relates to a control method when a power supply for a battery management system (BMS) of a hybrid vehicle is disconnected. More particularly, the present invention relates to a control method when a power supply for a battery management system (BMS) of a hybrid vehicle is disconnected, which is to improve driving stability and driver safety in response to disconnection occurring in a circuit between the BMS for battery management and a battery that supplies power to the BMS.

Description

하이브리드 차량의 BMS 전원 단선시 제어 방법 {Control method of HEV corresponding to BMS power disconnection}Control method of HEV corresponding to BMS power disconnection in case of BMS power disconnection of hybrid vehicle

본 발명은 하이브리드 차량의 BMS 전원 단선시 제어 방법에 관한 것으로, 상세하게는 배터리 관리를 위한 BMS(Battery Management System)와 상기 BMS에 전원을 공급하는 배터리 사이의 회로에 발생하는 단선에 대응하여 주행안정성 및 운전자 안전을 제고하기 위한 하이브리드 차량의 BMS 전원 단선시 제어 방법에 관한 것이다. The present invention relates to a control method when the BMS power is disconnected in a hybrid vehicle, and in detail, driving stability in response to a disconnection occurring in a circuit between a battery management system (BMS) for battery management and a battery supplying power to the BMS. And a control method when a BMS power supply of a hybrid vehicle is disconnected to improve driver safety.

하이브리드 차량은 엔진과 전기모터를 구동원으로 이용하여 주행하는 차량으로서, 상기 전기모터에 구동전력을 공급하는 고전압배터리가 탑재되며, 상기 고전압배터리는 배터리릴레이를 통해 전기모터와 고전압 전장부하에 전력을 공급하게 된다.A hybrid vehicle is a vehicle that runs using an engine and an electric motor as driving sources, and a high-voltage battery that supplies driving power to the electric motor is mounted, and the high-voltage battery supplies power to the electric motor and high-voltage electric load through a battery relay. Is done.

또한 하이브리드 차량은 상기 고전압배터리의 상태를 진단하고 상기 배터리릴레이의 작동을 제어하는 BMS(Battery Management System)가 탑재되며, 차량의 주행을 위해 HCU(Hybrid Control Unit) 및 MCU(Motor Control Unit) 등의 차량 제어부와 상기 BMS 간에 통신은 필수적이라고 할 수 있다. In addition, the hybrid vehicle is equipped with a BMS (Battery Management System) that diagnoses the state of the high voltage battery and controls the operation of the battery relay, and includes a hybrid control unit (HCU) and a motor control unit (MCU) for driving the vehicle. It can be said that communication between the vehicle control unit and the BMS is essential.

따라서 주행중에 BMS에 관련된 통신불량이 발생하는 경우, 일정부분 주행을 가능하게 하여 주행중인 차량이 갑자기 멈춤에 따른 사고를 방지할 수 있도록 하고 있다. Therefore, when a communication failure related to the BMS occurs while driving, a certain portion of the vehicle can be driven to prevent an accident caused by a sudden stop of the vehicle being driven.

상기 BMS가 차량의 통신버스상에서 이탈하는 경우 BMS의 통신 타임아웃 현상이 발생한다. 이때 BMS는 상기 통신 타임아웃 현상이 발생하기 이전의 작동상태로 배터리릴레이를 유지시킨다. 예를 들어 배터리릴레이가 온 상태로 주행중이면 통신 타임아웃 현상이 발생한 이후에 상기 배터리릴레이를 온 상태로 작동 유지시켜 주행이 가능하도록 한다. 그리고 상기 BMS는 배터리릴레이의 온(ON) 작동 중 고전압배터리의 과충전(배터리 SOC > 100%) 또는 과방전(배터리 SOC < 5%)이 우려되는 상황이 되면 자체적으로 배터리릴레이를 오프시켜 고전압배터리를 보호한다. When the BMS deviates from the communication bus of the vehicle, a communication timeout phenomenon of the BMS occurs. At this time, the BMS maintains the battery relay in an operating state before the communication timeout phenomenon occurs. For example, when the battery relay is running while the battery relay is on, the battery relay is operated and maintained in the on state after a communication timeout phenomenon occurs to enable driving. In addition, when the BMS is concerned about overcharging (battery SOC> 100%) or overdischarging (battery SOC <5%) of the high voltage battery during the ON operation of the battery relay, the BMS turns off the battery relay itself to turn off the high voltage battery. Protect.

그리고 HCU는 BMS와의 통신이 불가한 상황이므로 배터리릴레이가 이전의 작동상태를 유지하는 것으로 간주하고, 차량이 EV 모드로 주행중이면 HSG(Hybrid Starter Generator)에 토크지령을 인가하여 엔진 시동을 확보하고 차량이 엔진 모드로 주행하도록 한다. 또한 상기 HCU는 MCU로 송출하는 모터토크지령의 송출을 중단하고 회생제동에 의한 배터리 충전만 허용한다. 상기 HCU는 MCU를 통해 검출되는 인버터 캐패시터의 전압값이 일정전압 이상일 경우 고전압배터리의 과충전이 우려되는 상황이라고 판단하고 상기 고전압배터리의 충전을 차단시킨다. 아울러 상기 HCU는 차량의 주행가능 여부를 표시하는 계기판의 레디램프를 블링킹(blinking) 모드로 작동시켜 운전자에게 차량이 비정상 상태임을 알린다. And since HCU cannot communicate with BMS, it is considered that the battery relay maintains the previous operating state. If the vehicle is running in EV mode, it applies a torque command to HSG (Hybrid Starter Generator) to secure engine start and Drive in this engine mode. In addition, the HCU stops the transmission of the motor torque command sent to the MCU and only allows charging of the battery by regenerative braking. When the voltage value of the inverter capacitor detected through the MCU is higher than a certain voltage, the HCU determines that the high voltage battery is concerned about overcharging, and blocks charging of the high voltage battery. In addition, the HCU notifies the driver that the vehicle is in an abnormal state by operating the ready lamp of the instrument panel indicating whether the vehicle is capable of driving in a blinking mode.

상기와 같이 BMS의 통신 타임아웃 상황에서 배터리릴레이를 이전 작동상태로 유지시킨채 엔진만 이용하는 엔진 모드로 주행을 하는 이유는, 고전압배터리의 전력에 의한 LDC(Low-Voltage DC-DC Converter)의 지속적인 구동확보가 가능하기 때문이다. 상기 배터리릴레이를 오프하고 엔진 모드로 주행하는 림폼 주행의 경우, 주행상황에 따라 HSG의 역기전력이 LDC 구동전압을 만족하지 못할 수 있고 이 경우 주행을 지속하게 되면 차량의 저전압배터리가 방전될 우려가 있다. As described above, the reason for driving in engine mode using only the engine while maintaining the battery relay in the previous operating state in the communication timeout situation of the BMS is that the LDC (Low-Voltage DC-DC Converter) is continuously operated by the power of the high voltage battery. This is because driving can be secured. In the case of rimform driving in which the battery relay is turned off and driving in engine mode, the back electromotive force of HSG may not satisfy the LDC driving voltage depending on the driving situation, and in this case, there is a concern that the low voltage battery of the vehicle may be discharged if driving continues. .

한편, 상기 BMS는 차량의 저전압배터리로부터 전력을 공급받게 되며, 상기 저전압배터리와 BMS 사이에 설치된 배터리퓨즈를 통해 저전압배터리의 전력이 BMS에 공급되고, 상기 BMS는 저전압배터리의 전력을 이용하여 배터리릴레이의 온/오프 동작을 제어한다. Meanwhile, the BMS is supplied with power from the low-voltage battery of the vehicle, and the power of the low-voltage battery is supplied to the BMS through a battery fuse installed between the low-voltage battery and the BMS, and the BMS is a battery relay using the power of the low-voltage battery. Control the on/off operation of

상기 배터리퓨즈가 단선되는 경우, BMS는 저전압배터리로부터 전력공급이 중단되므로 차량 제어부와의 통신을 위한 신호를 송출할 수 없게 되어 통신 타임아웃 현상이 발생되고, 배터리릴레이의 클로즈 상태를 유지시키기 위한 전원이 상실되므로 배터리릴레이는 지령과 무관하게 오픈/오프 상태가 된다. 이때 HCU는 BMS의 통신 타임아웃 상황이 발생함에 따라 차량 주행상태를 유지시키려 하고 레디램프를 점멸(blinking) 모드로 작동시킨다. When the battery fuse is disconnected, the BMS is unable to transmit a signal for communication with the vehicle control unit because power supply from the low voltage battery is interrupted, resulting in a communication timeout phenomenon, and a power supply for maintaining the closed state of the battery relay. Since this is lost, the battery relay is in an open/off state regardless of the command. At this time, the HCU tries to maintain the vehicle driving state as the communication timeout situation of the BMS occurs, and operates the ready lamp in the blinking mode.

이와 같이 종래에는 배터리릴레이의 오픈에 의한 고전압 회로의 단선이 발생하는 경우, BMS에 관련된 통신고장 시와 동일한 전력으로 차량 제어가 수행됨에 의해 다음과 같은 사이드 이펙트(side effect)가 발생하게 된다. As described above, when the high voltage circuit is disconnected due to the open of the battery relay in the related art, the following side effects occur as the vehicle is controlled with the same power as in the case of a communication failure related to the BMS.

1. 주행중 발생하는 회생제동에 의해 인버터 캐패시터의 전압이 지속적으로 상승하게 되면 인버터 파워모듈의 소손이 발생하게 되므로, 상기 파워모듈의 소손을 방지하기 위해 인버터 작동을 오프시키게 되며, 이에 회생제동이 불안정해져 차량 제동시에 이상 거동(차량 울컥거림)이 발생하게 된다.1. If the voltage of the inverter capacitor continues to rise due to the regenerative braking that occurs while driving, the inverter power module is burned, so the operation of the inverter is turned off to prevent burnout of the power module. Accordingly, regenerative braking is unstable. It is determined, and abnormal behavior (vehicle rumbling) occurs when the vehicle is braked.

2. EV 모드로 주행중 배터리릴레이의 단선이 발생하는 경우 고전압 회로의 단선에 의해 고전압 전력의 사용이 불가한 상태가 되나, HCU가 엔진 모드로 주행을 하기 위해 고전압 전력에 의해 구동되는 HSG를 이용한 엔진 시동을 지속적으로 시도하고 상기 엔진 시동이 반복적으로 실패하게 된다.2. If the battery relay is disconnected while driving in EV mode, the use of high voltage power becomes impossible due to the disconnection of the high voltage circuit, but the engine using HSG driven by high voltage power for the HCU to run in engine mode The starting is continuously attempted and the engine starting repeatedly fails.

3. 또한 림폼 주행시 OPU(Oil Pump Unit)의 최소 구동전압을 확보하기 위해 LDC 구동전압에 상당하는 HSG 역기전력이 확보되어야 하지만 상기 역기전력이 확보되지 못함에 의해 OPU 구동이 불가하게 되어 차량 셧다운이 발생하게 된다. 3. In addition, in order to secure the minimum driving voltage of the OPU (Oil Pump Unit) when driving the rim, the HSG back EMF equivalent to the LDC driving voltage must be secured. However, because the back EMF cannot be secured, the OPU cannot be driven, causing a vehicle shutdown. do.

본 발명은 상기와 같은 점을 감안하여 안출한 것으로서, BMS 전원이 상실됨에 의해 배터리릴레이의 단선이 발생한 것으로 판단되면 차량의 주행모드에 따라 적절한 후속 제어를 수행하여 주행 안정성 및 운전자 안전을 제고하는 하이브리드 차량의 BMS 전원 단선시 제어 방법을 제공하는데 목적이 있다. The present invention was devised in consideration of the above points, and when it is determined that the disconnection of the battery relay occurs due to the loss of BMS power, a hybrid that improves driving stability and driver safety by performing appropriate follow-up control according to the driving mode of the vehicle. The purpose is to provide a control method when the vehicle's BMS power is disconnected.

이에 본 발명에서는, 전동식유압펌프에 의해 형성되는 유압을 이용하여 작동되는 변속기를 통해 차륜에 동력을 전달하는 엔진과 BMS(Battery Management System)에 의해 제어되는 배터리릴레이를 통해 고전압배터리의 전력을 공급받아 구동되는 모터를 이용하여 주행하는 하이브리드 차량의 BMS 전원 단선시 제어 방법으로서, Accordingly, in the present invention, power from a high-voltage battery is supplied through an engine that transmits power to the wheels through a transmission operated using hydraulic pressure formed by an electric hydraulic pump and a battery relay controlled by a Battery Management System (BMS). As a control method when the BMS power supply of a hybrid vehicle running using a driven motor is disconnected,

차량의 레디 상태에서 상기 BMS의 통신 타임아웃이 발생한 것으로 판단되면, 상기 고전압배터리로부터 인가되는 전류를 변환시켜 상기 모터에 공급하는 인버터와 상기 고전압배터리로부터 인가되는 전류를 상기 인버터에 인가하는 상기 배터리릴레이 사이에 연결된 인버터 캐패시터의 전압을 검출하여 상기 캐패시터의 전압값을 설정된 기준전압과 비교하는 제1단계; 상기 인버터 캐패시터의 전압이 상기 기준전압 이하이면, 상기 배터리릴레이의 단선이 발생한 것으로 진단하고 차량의 주행모드를 모터주행모드와 하이브리드주행모드 중 어느 하나로 구분하는 제2단계; 차량의 주행모드가 하이브리드주행모드이면 엔진만 이용하여 주행하는 엔진주행모드에 진입시키는 제3단계; 상기 차량의 주행모드가 모터주행모드이면 주행속도에 따라 차량이 정차중일 때와 주행중 일때로 구분하는 제4단계; 및 상기 차량이 주행중일 때는 모터와 엔진 사이에 설치된 엔진클러치를 슬립시켜 엔진 시동을 위한 엔진 초기 회전력을 확보하고 엔진 시동을 수행하는 제5단계;를 포함하는 하이브리드 차량의 BMS 전원 단선시 제어 방법을 제공한다. When it is determined that the communication timeout of the BMS has occurred in the ready state of the vehicle, the inverter converts the current applied from the high voltage battery and supplies the motor to the motor, and the battery relay applies the current applied from the high voltage battery to the inverter. A first step of detecting a voltage of an inverter capacitor connected therebetween and comparing the voltage value of the capacitor with a set reference voltage; A second step of diagnosing that a disconnection of the battery relay has occurred when the voltage of the inverter capacitor is less than the reference voltage and dividing a driving mode of the vehicle into one of a motor driving mode and a hybrid driving mode; A third step of entering an engine driving mode in which only the engine is used when the driving mode of the vehicle is a hybrid driving mode; A fourth step of dividing when the vehicle is stopped and when the vehicle is running according to a driving speed when the driving mode of the vehicle is a motor driving mode; And a fifth step of securing an initial engine rotational force for starting the engine by slipping an engine clutch installed between the motor and the engine when the vehicle is running, and performing the engine start; a control method when the BMS power of the hybrid vehicle is disconnected, comprising: to provide.

또한 상기 제4단계에서 차량이 정차중인 것으로 판단되면, 차량의 주행가능 여부를 표시하는 레디램프를 오프시켜 차량이 주행불가상태임을 나타내어 운전자에게 알리는 것이 바람직하다. In addition, when it is determined in the fourth step that the vehicle is stopped, it is preferable to turn off a ready lamp indicating whether the vehicle is capable of driving to indicate that the vehicle is in a driving impossibility state to notify the driver.

또한 상기 제5단계에서 엔진 시동을 확보한 후에는 모터에 인가되는 충전토크지령 및 방전토크지령의 송출을 중단하여 엔진주행모드를 지속시키는 것이 바람직하다. 그리고 상기 엔진주행모드에 진입하면 엔진에 연결된 HSG(Hybrid Starter Generator)에 걸리는 역기전력을 이용하여 상기 전동식유압펌프의 구동전압을 확보할 수 있게 된다. In addition, after ensuring the engine start in the fifth step, it is preferable to stop the transmission of the charging torque command and the discharge torque command applied to the motor to continue the engine running mode. In addition, when entering the engine driving mode, the driving voltage of the electric hydraulic pump can be secured by using the back electromotive force applied to the hybrid starter generator (HSG) connected to the engine.

또한 상기 제3단계에서도 엔진주행모드에 진입하게 되면 모터에 인가되는 충전토크지령 및 방전토크지령의 송출을 중단하고, 엔진에 연결된 HSG(Hybrid Starter Generator)에 걸리는 역기전력을 이용하여 상기 전동식유압펌프의 구동전압을 확보할 수 있게 된다.In addition, when entering the engine driving mode in the third step, the transmission of the charging torque command and the discharge torque command applied to the motor is stopped, and the back electromotive force applied to the HSG (Hybrid Starter Generator) connected to the engine is used to control the electric hydraulic pump. It is possible to secure the driving voltage.

한편, 상기 제1단계에서 검출한 인버터 캐패시터의 전압값이 상기 기준전압을 초과하면, 상기 배터리릴레이의 단선이 미발생한 것으로 진단하고 상기 BMS의 통신 타임아웃에 대응하기 위해 HSG(Hybrid Starter Generator)를 구동시켜 엔진 시동을 실행하고 엔진주행모드에 진입시킨다. 상기 엔진주행모드에 진입시킨 후에는 모터에 인가되는 방전토크지령의 송출을 중단하고 충전토크지령의 송출은 허용하는데, 상기 인버터 캐패시터의 전압값이 설정된 일정전압 이상이 되면 상기 모터에 인가되는 충전토크지령의 송출을 중단하여 고전압배터리의 과충전 발생을 방지한다. Meanwhile, when the voltage value of the inverter capacitor detected in the first step exceeds the reference voltage, it is diagnosed that the disconnection of the battery relay has not occurred and a hybrid starter generator (HSG) is used to respond to the communication timeout of the BMS. Drive it to start the engine and enter the engine running mode. After entering the engine driving mode, the transmission of the discharge torque command applied to the motor is stopped, and the transmission of the charging torque command is allowed.When the voltage value of the inverter capacitor exceeds a set predetermined voltage, the charging torque applied to the motor Stop sending the command to prevent overcharging of the high voltage battery.

본 발명에 따른 하이브리드 차량의 BMS 전원 단선시 제어 방법에 의하면, BMS의 전원 상실에 따른 배터리릴레이의 단선 문제가 발생하는 경우, BMS의 통신고장과 구분되는 적절한 후속조치를 수행하도록 함으로써, BMS의 전원 상실에 따른 차량의 비상상황에서 주행 지속성 및 안정성을 확보하고 주행중 시동 꺼짐에 의한 사고 발생을 방지할 수 있게 된다. According to the control method when the BMS power is disconnected in a hybrid vehicle according to the present invention, when a battery relay disconnection problem occurs due to a power loss of the BMS, appropriate follow-up measures are performed, which are distinguished from the communication failure of the BMS, thereby powering the BMS. It is possible to ensure driving continuity and stability in an emergency situation of a vehicle due to loss, and to prevent accidents caused by turning off the engine while driving.

도 1은 하이브리드 차량의 파워 시스템을 나타낸 블록도
도 2는 하이브리드 차량의 모터 시스템을 나타낸 블록도
도 3은 본 발명에 따른 하이브리드 차량의 BMS 전원 단선시 제어 방법을 나타낸 흐름도 1 is a block diagram showing a power system of a hybrid vehicle
2 is a block diagram showing a motor system of a hybrid vehicle
3 is a flow chart showing a control method when the BMS power is disconnected of a hybrid vehicle according to the present invention

이하, 본 발명을 해당 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 설명하기로 한다.Hereinafter, the present invention will be described so that those skilled in the art can easily implement the present invention.

도 1 및 도 2에 도시된 바와 같이, 하이브리드 차량은 엔진(1)과 모터(2)를 구동원으로 이용하여 주행하는 차량으로서, 상기 모터(2)에 구동전력을 공급하는 고전압배터리(3)가 탑재되며, 상기 고전압배터리(3)는 배터리릴레이(4)를 통해 모터(2)와 고전압 전장부하에 전력을 공급가능하게 된다. 그리고 상기 고전압배터리(3)의 전력은 LDC(Low-Voltage DC-DC Converter)(8)를 통해 저전압배터리(7)에 공급될 수 있다. 1 and 2, a hybrid vehicle is a vehicle running using the engine 1 and the motor 2 as driving sources, and a high voltage battery 3 that supplies driving power to the motor 2 is It is mounted, and the high voltage battery 3 is capable of supplying power to the motor 2 and the high voltage electric load through the battery relay 4. Further, the power of the high voltage battery 3 may be supplied to the low voltage battery 7 through a low-voltage DC-DC converter (LDC) 8.

상기 저전압배터리(7)는 배터리퓨즈(10)를 통해 BMS(Battery Management System)(9)와 연결되어 상기 BMS(9)에 제어전원을 공급하며, 상기 BMS(9)는 고전압배터리(3)의 상태를 진단하고 상기 모터(2)와 고전압 전장부하에 고전압 전력을 인가하기 위한 배터리릴레이(4)의 온/오프 작동을 제어한다. 또한 상기 배터리릴레이(4)는 저전압배터리(7)의 전력을 이용하여 온(ON) 작동된다. 상기 모터(2)에 인가되는 전류 변환을 위한 인버터(5)와 배터리릴레이(4) 사이에는 전류 평활을 위한 인버터 캐패시터(6)가 연결된다. The low voltage battery 7 is connected to a battery management system (BMS) 9 through a battery fuse 10 to supply control power to the BMS 9, and the BMS 9 is the high voltage battery 3 The condition is diagnosed and the on/off operation of the battery relay 4 for applying high voltage power to the motor 2 and the high voltage electric load is controlled. In addition, the battery relay 4 is turned on by using the power of the low voltage battery 7. An inverter capacitor 6 for smoothing current is connected between the inverter 5 for converting the current applied to the motor 2 and the battery relay 4.

상기 BMS(9)는, 차량의 주행을 위해, 모터(2)의 제어를 위한 MCU(Motor Control Unit) 및 상위제어기로서 상기 MCU에 모터토크지령을 송출하는 HCU(Hybrid Control Unit) 등의 차량 제어부와 통신을 수행하게 된다. The BMS 9 is a vehicle control unit such as an MCU (Motor Control Unit) for controlling the motor 2 and an HCU (Hybrid Control Unit) that transmits a motor torque command to the MCU as a host controller for driving the vehicle. And communication.

또한 하이브리드 차량은 HSG(Hybrid Starter Generator)(11)를 이용하여 엔진 시동을 걸게 되며, 전동식오일펌프(14)에 의해 형성되는 유압을 이용하여 작동되는 변속기(13)를 통해 엔진(1)의 출력 동력을 차륜에 전달하게 된다. In addition, the hybrid vehicle starts the engine using HSG (Hybrid Starter Generator) (11), and the output of the engine (1) through the transmission (13) operated using hydraulic pressure formed by the electric oil pump (14). It transmits power to the wheels.

이러한 하이브리드 차량은 레디 상태에서 배터리퓨즈(10)가 단선되는 등에 의해 상기 저전압배터리(7)와 BMS(9) 사이의 회로가 단선되어 배터리릴레이(4)의 구동전압이 상실되거나 또는 BMS(9)의 신호 송출을 위한 시그널커넥터가 탈거됨에 의해 상기 배터리릴레이(4)가 오픈상태로 전환될 수 있다. 차량의 레디 상태에서 배터리릴레이(4)는 온(ON) 작동되어 클로즈 모드가 되며, 상기 배터리릴레이(4)의 온 작동 시 엔진 시동을 걸기 위한 HSG(11)에 고전압 전력이 공급될 수 있다. In such a hybrid vehicle, the circuit between the low-voltage battery 7 and the BMS 9 is disconnected due to a disconnection of the battery fuse 10 in the ready state, and the driving voltage of the battery relay 4 is lost or the BMS 9 The battery relay 4 may be switched to an open state by removing the signal connector for transmitting a signal of. In the ready state of the vehicle, the battery relay 4 is turned on to enter a closed mode, and high voltage power may be supplied to the HSG 11 for starting the engine when the battery relay 4 is turned on.

다시 말해, 하이브리드 차량의 레디 상태에서 BMS 전원이 단선되는 경우, 배터리릴레이(4)가 오픈되어 고전압 회로가 단선되는 상황이 발생하게 된다. In other words, when the BMS power is disconnected in the ready state of the hybrid vehicle, the battery relay 4 is opened and the high voltage circuit is disconnected.

그러나, 상기 BMS 전원이 단선되어 BMS(9)가 HCU에 고전압 단선 상황의 정보를 송출할 수 없기 때문에 상기 HCU에서는 간접적으로 고전압 단선 상황을 진단해야 한다.However, since the BMS power is disconnected and the BMS 9 cannot transmit information on the high voltage disconnection state to the HCU, the HCU must indirectly diagnose the high voltage disconnection state.

이에 본 발명에서는, 하이브리드 차량의 레디 상태에서 BMS 전원이 단선되는 경우, HCU(Hybrid Control Unit)에서 인버터 캐패시터(6)의 전압 검출값을 기준으로 배터리릴레이(4)의 회로 단선 여부를 진단하고, 그 진단결과에 따라 차량의 주행모드에 따른 적절한 후속조치가 이루어지도록 함으로써 주행안전성을 확보하도록 한다. Accordingly, in the present invention, when the BMS power is disconnected in the ready state of the hybrid vehicle, the HCU (Hybrid Control Unit) diagnoses whether the circuit disconnection of the battery relay 4 is based on the voltage detection value of the inverter capacitor 6, Driving safety is ensured by taking appropriate follow-up measures according to the driving mode of the vehicle according to the diagnosis result.

이를 위해 본 발명에 따른 하이브리드 차량의 BMS 전원 단선시 제어 방법은, 도 3에 도시된 바와 같이, 차량의 레디 상태에서 BMS(9)의 통신 타임아웃이 발생한 것으로 판단되면 인버터 캐패시터(6)의 전압을 검출하고 상기 캐패시터(6)의 전압값을 설정된 기준전압과 비교하는 제1단계; 상기 인버터 캐패시터(6)의 전압값이 상기 기준전압 이하이면 차량의 주행모드를 모터주행모드(EV 모드)와 하이브리드주행모드(HEV 모드) 중 어느 하나의 주행모드로 구분하여 판단하는 제2단계; 차량의 주행모드가 하이브리드주행모드이면 엔진(1)만 이용하여 주행하는 엔진주행모드에 진입시키는 제3단계;를 포함하며, 이러한 제어 과정은 HCU(Hybrid Control Unit) 등의 차량 제어부에 의해 수행될 수 있다.To this end, the control method of the hybrid vehicle when the BMS power is disconnected according to the present invention is, as shown in FIG. 3, when it is determined that the communication timeout of the BMS 9 occurs in the ready state of the vehicle, the voltage of the inverter capacitor 6 A first step of detecting and comparing the voltage value of the capacitor 6 with a set reference voltage; A second step of dividing and determining a driving mode of the vehicle into any one of a motor driving mode (EV mode) and a hybrid driving mode (HEV mode) when the voltage value of the inverter capacitor 6 is less than the reference voltage; If the driving mode of the vehicle is a hybrid driving mode, a third step of entering the engine driving mode in which the vehicle is driven using only the engine 1; and this control process is performed by a vehicle control unit such as a hybrid control unit (HCU). I can.

상기 HCU는, 차량의 레디 상태에서 일정 시간동안 BMS(9)로부터 송출되는 신호가 없으면 BMS(9)의 통신 타임아웃이 발생한 것으로 판단한다. The HCU determines that a communication timeout of the BMS 9 has occurred if there is no signal transmitted from the BMS 9 for a predetermined period of time in the vehicle ready state.

상기 인버터 캐패시터(6)는 고전압배터리(3)로부터 인가되는 전류를 3상 교류로 변환시켜 모터(2)에 공급하는 인버터(5)와 상기 고전압배터리(3)로부터 공급되는 전류를 상기 인버터(5)에 인가하는 배터리릴레이(4) 사이에 연결 배치된다. The inverter capacitor 6 converts the current applied from the high voltage battery 3 into a three-phase alternating current and supplies the inverter 5 to the motor 2 and the current supplied from the high voltage battery 3 to the inverter 5 It is connected and arranged between the battery relays 4 applied to ).

상기 기준전압은 인버터 캐패시터(6)의 정상전압값의 일정 비율에 상당하는 전압값으로 설정될 수 있다. 상기 인버터 캐패시터(6)의 전압값이 상기 기준전압 이하이면, 상기 HCU는 상기 배터리릴레이(4)가 클로즈 모드에서 오픈 모드로 전환되어 배터리릴레이(4)가 단선된 것으로 판단할 수 있다. 그리고 상기 인버터 캐패시터(6)의 전압 검출값이 상기 기준전압을 초과하면, 상기 HCU는 BMS(9)에 관련된 통신고장이 발생한 것으로 판단할 수 있다. 이에 따라 상기 HCU는 인버터 캐패시터(6)의 전압 검출값을 기초로 BMS(9)의 전원 상실 상황을 BMS(9)의 통신고장과 구분하여 판단할 수 있게 된다.The reference voltage may be set to a voltage value corresponding to a certain ratio of the normal voltage value of the inverter capacitor 6. If the voltage value of the inverter capacitor 6 is less than or equal to the reference voltage, the HCU may determine that the battery relay 4 is switched from the closed mode to the open mode and the battery relay 4 is disconnected. In addition, when the voltage detection value of the inverter capacitor 6 exceeds the reference voltage, the HCU may determine that a communication failure related to the BMS 9 has occurred. Accordingly, the HCU can determine a power loss situation of the BMS 9 by distinguishing it from a communication failure of the BMS 9 based on the voltage detection value of the inverter capacitor 6.

여기서 상기 인버터 캐패시터(6)의 정상전압은 배터리릴레이(4)가 클로즈 모드일 때에 인버터 캐패시터(6)의 정상상태의 전압값으로 설정될 수 있으며, 상기 기준전압은 사전 평가 등을 통해 상기 정상전압의 일정 비율(예를 들어 50%)로 선정될 될 수 있다. Here, the normal voltage of the inverter capacitor 6 may be set as the normal voltage value of the inverter capacitor 6 when the battery relay 4 is in the closed mode, and the reference voltage is the normal voltage through pre-evaluation. It can be selected as a certain percentage (for example, 50%).

상기 HCU는, 배터리릴레이(4)의 단선 발생이 판정될 때, 차량의 주행모드가 하이브리드주행모드(HEV 모드)이면, 차량의 정차 여부에 상관없이, 주행모드를 엔진주행모드로 전환시켜 차량 주행을 지속시킬 수 있다. When it is determined that the disconnection of the battery relay 4 occurs, the HCU switches the driving mode to the engine driving mode, regardless of whether the vehicle is stopped, if the driving mode of the vehicle is a hybrid driving mode (HEV mode). Can continue.

하이브리드 차량이 상기 엔진주행모드에 진입하면, 모터 사용을 차단하기 위해, 상기 HCU는 모터(2)를 이용하여 고전압배터리(3)를 충전시키기 위한 충전토크지령 및 상기 모터(2)를 이용하여 고전압배터리(3)를 방전시키기 위한 방전토크지령을 MCU에 송출하지 않는다. 즉, 상기 HCU는 모터(2)의 구동 및 모터(2)를 이용한 배터리 충전을 위해 MCU에 송출하던 방전토크지령 및 충전토크지령의 송출을 중단하고 엔진주행모드를 지속시킨다. When the hybrid vehicle enters the engine driving mode, in order to block the use of the motor, the HCU uses a motor 2 to charge the high voltage battery 3 and a charging torque command for charging the high voltage battery 3 and the high voltage using the motor 2 The discharge torque command for discharging the battery 3 is not sent to the MCU. That is, the HCU stops transmitting the discharge torque command and the charging torque command sent to the MCU for driving the motor 2 and charging the battery using the motor 2, and continues the engine running mode.

차량의 고전압 전장부하에 포함되는 전동식오일펌프(14)는, 배터리릴레이(4)가 오픈 모드로 전환되면 구동전압을 확보하기 어렵게 된다. 따라서 상기 전동식오일펌프(14)의 구동을 유지하기 위해 HSG(11)의 최소 역기전력을 확보하는 것이 필요하다. In the electric oil pump 14 included in the high voltage electric load of the vehicle, it is difficult to secure a driving voltage when the battery relay 4 is switched to the open mode. Therefore, it is necessary to secure the minimum back electromotive force of the HSG 11 in order to maintain the driving of the electric oil pump 14.

엔진주행모드로 주행중에는 엔진(1)이 상시 구동되기 때문에 엔진(1)에 연결된 상기 HSG(11)에 역기전력이 걸려 고전압이 발생되며, 따라서 엔진주행모드에 진입한 뒤 상기 HSG(11)의 발전에 의해 상기 전동식오일펌프(14)의 구동전압에 상당하는 최소 역기전력을 확보할 수 있게 된다. During driving in the engine driving mode, since the engine 1 is always driven, back electromotive force is applied to the HSG 11 connected to the engine 1 and a high voltage is generated. Therefore, the power generation of the HSG 11 after entering the engine driving mode As a result, it is possible to secure a minimum back electromotive force corresponding to the driving voltage of the electric oil pump 14.

또한 전동식오일펌프(14)의 정전압 제어조건이 충족되는 경우 정전압 제어를 수행하는 것이 바람직하다. 전동식오일펌프(14)의 노미널(nominal) 전압에 상당하는 역기전압이 HSG(11)에 걸리는 경우 전동식오일펌프(14)의 정전압 제어를 수행할 수 있다. 예를 들어, 상기 노미널 전압은 270V일 수 있다. In addition, it is preferable to perform the constant voltage control when the constant voltage control condition of the electric oil pump 14 is satisfied. When a counter electromotive voltage corresponding to the nominal voltage of the electric oil pump 14 is applied to the HSG 11, constant voltage control of the electric oil pump 14 can be performed. For example, the nominal voltage may be 270V.

한편, 상기 HCU는, 배터리릴레이(4)의 단선 발생이 판정될 때 차량의 주행모드가 모터주행모드(EV 모드)이면, 주행속도에 따라 차량이 정차중일 때와 주행중일 때로 구분한다. On the other hand, when it is determined that the disconnection of the battery relay 4 occurs, the HCU classifies when the vehicle is stopped and when the vehicle is running according to the driving speed, if the driving mode of the vehicle is a motor driving mode (EV mode).

상기 HCU는, 차량이 모터주행모드로 주행중일 경우, 배터리릴레이(4)의 단선이 진단되면, 모터(2)와 엔진(1) 사이에 설치된 엔진클러치(12)를 슬립시켜 엔진 시동을 위한 엔진 초기 회전력을 확보할 수 있도록 한다. 상기 엔진 초기 회전력이 확보되면 엔진 실린더에 연료를 분사시키고 이후 파이어링(firing)을 통해 엔진 시동이 걸리도록 한다. 상기 HCU는, 상기 엔진 시동이 걸린 후에는, 모터(2)의 구동을 지시하기 위한 방전토크지령 및 모터(2)에 걸리는 역기전력을 이용한 배터리 충전을 지시하기 위한 충전토크지령을 MCU에 미송출(송출 중단)하여서 엔진주행모드를 지속시킨다. The HCU slips the engine clutch 12 installed between the motor 2 and the engine 1 when the disconnection of the battery relay 4 is diagnosed when the vehicle is running in the motor driving mode to start the engine. Make it possible to secure the initial torque. When the initial engine rotational power is secured, fuel is injected into the engine cylinder, and the engine is started through firing afterwards. After the engine is started, the HCU does not send a discharge torque command to instruct the driving of the motor 2 and a charging torque command to instruct the battery to charge using the back electromotive force applied to the motor 2 to the MCU ( Stop transmission) and continue the engine running mode.

그리고 상기 HCU는, HSG(11)의 최소 역기전력을 확보시켜서 전동식오일펌프(14)의 구동전압을 확보한다. 엔진주행모드로 주행중에는 엔진(1)의 상시 구동에 따라 엔진(1)에 연결된 HSG(11)에 역기전력이 걸려 고전압 전력이 발생되며, 따라서 엔진주행모드에 진입한 뒤 상기 HSG(11)의 발전에 의해 전동식오일펌프(14)의 구동전압에 상당하는 최소 역기전력을 확보할 수 있게 된다. In addition, the HCU secures the minimum counter electromotive force of the HSG 11 to secure the driving voltage of the electric oil pump 14. While driving in the engine driving mode, back electromotive force is applied to the HSG 11 connected to the engine 1 according to the constant driving of the engine 1 to generate high voltage power. Therefore, the power generation of the HSG 11 after entering the engine driving mode As a result, it is possible to secure a minimum back electromotive force corresponding to the driving voltage of the electric oil pump 14.

또한 상기 HCU는, 차량이 모터주행모드로 정차중일 경우, 즉 차량이 모터주행모드로 주행하는 중에 정차하게 될 때, 배터리릴레이(4)의 단선이 진단되면 엔진 시동을 확보할 수 있는 방안이 없으므로, 차량의 주행가능 여부를 표시하는 계기판의 레디램프를 오프시켜 차량이 주행불가상태임을 나타낸다. 상기 레디램프가 오프되는 경우 운전자는 차량이 주행불가능한 고장상태임을 인지할 수 있게 된다.In addition, the HCU, when the vehicle is stopped in the motor driving mode, that is, when the vehicle is stopped while driving in the motor driving mode, if the disconnection of the battery relay 4 is diagnosed, there is no way to ensure engine start. , It indicates that the vehicle cannot be driven by turning off the ready lamp of the instrument panel indicating whether the vehicle is capable of driving. When the ready lamp is turned off, the driver can recognize that the vehicle is in a state of failure in which driving is impossible.

그리고, 상기 HCU는, 차량의 레디 상태에서 BMS(9)에 관련된 통신고장이 발생한 것으로 판단되는 경우, 즉 차량의 레디 상태에서 BMS(9)의 통신 타임아웃이 발생하였으나 인버터 캐패시터(6)의 전압값이 상기 기준전압을 초과할 경우, 배터리릴레이(4)의 단선이 미발생한 것으로 진단한다. 이때 BMS(9)는, BMS(9)의 통신고장에 대응하기 위해, 통신고장이 발생한 것으로 판단되기 이전의 작동모드(온/오프)로 배터리릴레이의 동작상태를 유지시킨다. Further, the HCU, when it is determined that a communication failure related to the BMS 9 has occurred in the vehicle ready state, that is, the communication timeout of the BMS 9 occurs in the vehicle ready state, but the voltage of the inverter capacitor 6 If the value exceeds the reference voltage, it is diagnosed that the disconnection of the battery relay 4 has not occurred. At this time, in order to cope with the communication failure of the BMS 9, the BMS 9 maintains the operating state of the battery relay in an operation mode (on/off) before the communication failure is determined.

상기 HCU는, 배터리릴레이(4)의 단선이 미발생한 것으로 진단될 때 차량이 모터주행모드에 진입한 상태일 경우, 엔진 시동을 위해 HSG(11)에 토크지령을 인가하여 HSG(11)를 구동시키고 엔진 실린더에 연료를 분사한 후 파이어링을 통해 엔진 시동을 걸어서 차량을 엔진주행모드에 진입시킨다. 이때 상기 HCU는, 모터(2)의 충전토크지령을 MCU에 전송하여 회생제동에 의한 고전압배터리(3)를 충전시키는 것을 허용하되, 모터(2)의 구동력 발생을 위한 방전토크지령을 상기 MCU에 송출하는 것은 중단한다. The HCU drives the HSG 11 by applying a torque command to the HSG 11 to start the engine when the vehicle enters the motor driving mode when it is diagnosed that the disconnection of the battery relay 4 has not occurred. After the fuel is injected into the engine cylinder, the engine is started through firing to enter the engine driving mode. At this time, the HCU transmits the charging torque command of the motor 2 to the MCU, allowing the high voltage battery 3 to be charged by regenerative braking, but sends a discharge torque command for generating the driving force of the motor 2 to the MCU. Stop sending.

또한 상기 HCU는, MCU를 통해 검출되는 인버터 캐패시터(6)의 전압값이 설정된 일정전압 이상일 경우 고전압배터리(3)의 과충전이 우려되는 상황이라고 판단하고 고전압배터리(3)의 과충전 발생을 방지하기 위해 상기 MCU를 통해 모터(2)에 인가되는 충전토크지령의 송출을 중단한다. In addition, the HCU, when the voltage value of the inverter capacitor 6 detected through the MCU is greater than or equal to a set constant voltage, determines that overcharging of the high voltage battery 3 is a concern, and to prevent overcharging of the high voltage battery 3 The transmission of the charging torque command applied to the motor 2 through the MCU is stopped.

아울러 상기 HCU는, 상기 제1단계에서 검출한 인버터 캐패시터(6)의 전압값이 기준전압을 초과하면, 차량의 주행가능 여부를 표시하는 계기판의 레디램프를 블링킹(blinking) 모드로 작동시켜 운전자에게 차량이 비정상 상태임을 알린다. In addition, when the voltage value of the inverter capacitor 6 detected in the first step exceeds the reference voltage, the HCU operates the ready lamp of the instrument panel indicating whether the vehicle is capable of driving in a blinking mode. The vehicle is in an abnormal condition.

이상으로 본 발명의 실시예에 대해 상세히 설명하였는바, 본 발명의 권리범위는 상술한 실시예에 한정되지 않으며, 다음의 특허청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 또한 본 발명의 권리범위에 포함된다.As the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited to the above-described embodiments, and various modifications and variations by those skilled in the art using the basic concept of the present invention defined in the following claims Improvements are also included in the scope of the present invention.

1 : 엔진 2 : 모터
3 : 고전압배터리 4 : 배터리릴레이
5 : 인버터 6 : 인버터 캐패시터
7 : 저전압배터리 8 : LDC
9 : BMS 10 : 배터리퓨즈
11 : HSG 12 : 엔진클러치
13 : 변속기 14 : 전동식오일펌프1: engine 2: motor
3: high voltage battery 4: battery relay
5: inverter 6: inverter capacitor
7: low voltage battery 8: LDC
9: BMS 10: Battery fuse
11: HSG 12: Engine clutch
13: transmission 14: electric oil pump

Claims (11)

전동식유압펌프에 의해 형성되는 유압을 이용하여 작동되는 변속기를 통해 차륜에 동력을 전달하는 엔진과 BMS(Battery Management System)에 의해 제어되는 배터리릴레이를 통해 고전압배터리의 전력을 공급받아 구동되는 모터를 이용하여 주행하는 하이브리드 차량의 BMS 전원 단선시 제어 방법으로서,
차량의 레디 상태에서 상기 BMS의 통신 타임아웃이 발생한 것으로 판단되면, 상기 고전압배터리로부터 인가되는 전류를 변환시켜 상기 모터에 공급하는 인버터와 상기 고전압배터리로부터 인가되는 전류를 상기 인버터에 인가하는 상기 배터리릴레이 사이에 연결된 인버터 캐패시터의 전압을 검출하여 상기 캐패시터의 전압값을 설정된 기준전압과 비교하는 제1단계;
상기 인버터 캐패시터의 전압이 상기 기준전압 이하이면, 상기 배터리릴레이의 단선이 발생한 것으로 진단하고 차량의 주행모드를 모터주행모드와 하이브리드주행모드 중 어느 하나로 구분하는 제2단계;
차량의 주행모드가 하이브리드주행모드이면 엔진만 이용하여 주행하는 엔진주행모드에 진입시키는 제3단계;
를 포함하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
An engine that transmits power to the wheels through a transmission operated using hydraulic pressure formed by an electric hydraulic pump and a motor driven by receiving power from a high voltage battery through a battery relay controlled by a BMS (Battery Management System). As a control method when the BMS power supply of the hybrid vehicle is disconnected,
When it is determined that the communication timeout of the BMS has occurred in the ready state of the vehicle, the inverter converts the current applied from the high voltage battery and supplies the motor to the motor, and the battery relay applies the current applied from the high voltage battery to the inverter. A first step of detecting a voltage of an inverter capacitor connected therebetween and comparing the voltage value of the capacitor with a set reference voltage;
A second step of diagnosing that a disconnection of the battery relay has occurred when the voltage of the inverter capacitor is less than the reference voltage and dividing a driving mode of the vehicle into one of a motor driving mode and a hybrid driving mode;
A third step of entering an engine driving mode in which only the engine is used when the driving mode of the vehicle is a hybrid driving mode;
Control method when the BMS power is disconnected of the hybrid vehicle comprising a.
 청구항 1에 있어서,
상기 차량의 주행모드가 모터주행모드이면 주행속도에 따라 차량이 정차중일 때와 주행중 일때로 구분하는 제4단계;
상기 차량이 주행중일 때는 모터와 엔진 사이에 설치된 엔진클러치를 슬립시켜 엔진 시동을 위한 엔진 초기 회전력을 확보하고 엔진 시동을 수행하는 제5단계;
를 포함하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 1,
A fourth step of dividing when the vehicle is stopped and when the vehicle is running according to a driving speed when the driving mode of the vehicle is a motor driving mode;
A fifth step of securing an initial engine rotational force for starting the engine by slipping an engine clutch installed between the motor and the engine when the vehicle is running, and performing engine start;
Control method when the BMS power supply of the hybrid vehicle is disconnected, comprising a.
 청구항 2에 있어서,
상기 제4단계에서 차량이 정차중인 것으로 판단되면 차량의 주행가능 여부를 표시하는 레디램프를 오프시켜 차량이 주행불가상태임을 나타내는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 2,
In the fourth step, when it is determined that the vehicle is stopped, a ready lamp indicating whether the vehicle is capable of driving is turned off to indicate that the vehicle is in a driving impossible state.
 청구항 2에 있어서,
상기 제5단계에서 엔진 시동을 확보한 후에는 모터에 인가되는 충전토크지령 및 방전토크지령의 송출을 중단하고 엔진주행모드를 지속시키는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 2,
After securing the engine start in the fifth step, the transmission of the charging torque command and the discharge torque command applied to the motor is stopped and the engine running mode is continued.
 청구항 4에 있어서,
상기 엔진주행모드에 진입하면 엔진에 연결된 HSG(Hybrid Starter Generator)에 걸리는 역기전력을 이용하여 상기 전동식유압펌프의 구동전압을 확보하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method of claim 4,
When entering the engine driving mode, the driving voltage of the electric hydraulic pump is secured by using a counter electromotive force applied to a hybrid starter generator (HSG) connected to the engine.
 청구항 1에 있어서,
상기 제3단계에서 엔진주행모드에 진입하게 되면, 모터에 인가되는 충전토크지령 및 방전토크지령의 송출을 중단하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 1,
When entering the engine driving mode in the third step, the transmission of the charging torque command and the discharge torque command applied to the motor is stopped.
 청구항 1에 있어서,
상기 제3단계에서 엔진주행모드에 진입하면 엔진에 연결된 HSG(Hybrid Starter Generator)에 걸리는 역기전력을 이용하여 상기 전동식유압펌프의 구동전압을 확보하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 1,
When entering the engine driving mode in the third step, the driving voltage of the electric hydraulic pump is secured by using the back electromotive force applied to the HSG (Hybrid Starter Generator) connected to the engine.
 청구항 1에 있어서,
상기 제1단계에서 검출한 인버터 캐패시터의 전압값이 상기 기준전압을 초과하면, 상기 배터리릴레이의 단선이 미발생한 것으로 진단하고 상기 BMS의 통신 타임아웃에 대응하기 위해 HSG(Hybrid Starter Generator)를 구동시켜 엔진 시동을 실행하고 엔진주행모드에 진입시키는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method according to claim 1,
When the voltage value of the inverter capacitor detected in the first step exceeds the reference voltage, it is diagnosed that the disconnection of the battery relay has not occurred, and the HSG (Hybrid Starter Generator) is driven to respond to the communication timeout of the BMS. A control method when a BMS power supply of a hybrid vehicle is disconnected, characterized in that the engine starts and enters the engine driving mode.
 청구항 8에 있어서,
상기 엔진주행모드에 진입시킨 후에는 모터에 인가되는 방전토크지령의 송출을 중단하고 충전토크지령의 송출은 허용하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method of claim 8,
After entering the engine driving mode, the transmission of the discharge torque command applied to the motor is stopped, and the transmission of the charging torque command is allowed.
 청구항 9에 있어서,
상기 인버터 캐패시터의 전압값이 설정된 일정전압 이상이면 상기 모터에 인가되는 충전토크지령의 송출을 중단하여 고전압배터리의 과충전 발생을 방지하는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.
The method of claim 9,
When the voltage value of the inverter capacitor is greater than or equal to a set constant voltage, transmission of the charging torque command applied to the motor is stopped to prevent overcharging of the high voltage battery.
 청구항 1에 있어서,
상기 제1단계에서 검출한 인버터 캐패시터의 전압값이 상기 기준전압을 초과하면, 차량의 주행가능 여부를 표시하는 레디램프를 블링킹 모드로 작동시켜 차량이 비정상상태임을 나타내는 것을 특징으로 하는 하이브리드 차량의 BMS 전원 단선시 제어 방법.The method according to claim 1,
When the voltage value of the inverter capacitor detected in the first step exceeds the reference voltage, a ready lamp indicating whether the vehicle can be driven is operated in a blinking mode to indicate that the vehicle is in an abnormal state. Control method when BMS power is disconnected.
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