WO2009067887A1 - Dc-dc control method for hybrid electric vehicles - Google Patents

Dc-dc control method for hybrid electric vehicles Download PDF

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Publication number
WO2009067887A1
WO2009067887A1 PCT/CN2008/072950 CN2008072950W WO2009067887A1 WO 2009067887 A1 WO2009067887 A1 WO 2009067887A1 CN 2008072950 W CN2008072950 W CN 2008072950W WO 2009067887 A1 WO2009067887 A1 WO 2009067887A1
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WO
WIPO (PCT)
Prior art keywords
converter
output voltage
control method
value
hybrid vehicle
Prior art date
Application number
PCT/CN2008/072950
Other languages
French (fr)
Chinese (zh)
Inventor
Shangdong Yang
Original Assignee
Chery Automobile Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chery Automobile Co., Ltd. filed Critical Chery Automobile Co., Ltd.
Publication of WO2009067887A1 publication Critical patent/WO2009067887A1/en

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Classifications

    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B60K6/485—Motor-assist type
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • 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
    • 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
    • B60W2050/0001—Details of the control system
    • B60W2050/0002—Automatic control, details of type of controller or control system architecture
    • B60W2050/0004—In digital systems, e.g. discrete-time systems involving sampling
    • B60W2050/0006—Digital architecture hierarchy
    • 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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/086—Power
    • B60W2710/087—Power change rate
    • 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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/28—Fuel cells
    • B60W2710/285—Temperature
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the invention belongs to the field of hybrid vehicle control, and realizes the control of the DC-DC converter of the hybrid vehicle.
  • Hybrid vehicles take into account the advantages of internal combustion engines and pure electric vehicles. They have the advantages of low fuel consumption, low emissions, and long mileage. They are currently a practical solution.
  • a parallel hybrid hybrid vehicle there are typically two electrical energy storage packages, a high voltage electrical energy storage package and a low voltage electrical energy storage package.
  • the high-voltage electrical energy storage package usually a high voltage battery (HV: High Voltage), mainly converts the kinetic energy of the vehicle into electrical energy when the vehicle is regeneratively braked, and then releases the electrical energy when the vehicle requires motor-assisted driving.
  • HV High Voltage
  • the low voltage electrical energy storage package usually a low voltage battery (LV: Low Voltage), mainly supplies power to the vehicle low voltage network.
  • a DC-DC converter is required between the high-voltage network and the low-voltage network.
  • the DC-DC converter is a DC voltage converter that is responsible for supplying the power of the high voltage network to the low voltage network.
  • the output voltage of the generator is set to a fixed value, and the change does not depend on the condition of the entire vehicle.
  • This control method can meet the power demand of the low-voltage network and maintain the balance of the power of the low-voltage battery. However, under certain operating conditions, it will affect the power efficiency of the vehicle.
  • the object of the present invention is to provide a DC-DC control method for a hybrid vehicle, which is particularly suitable for a coaxial parallel hybrid vehicle of an electric motor and an engine, which can improve the utilization efficiency of electric energy and make the whole vehicle Energy flow is more reasonable.
  • the present invention adopts the following technical solution: obtaining an operation mode of the hybrid vehicle according to a state of the integrated electric generator (ISG: Integrated Starter Generator); according to the hybrid vehicle
  • the hybrid controller HCU: Hybrid Control Unit
  • the hybrid controller controls an operating state of the DC-DC converter.
  • the present invention proposes a method for dynamically controlling a DC-DC converter according to the specific operating conditions of the hybrid vehicle. Based on the operating state of the ISG motor, a specific operating mode of the hybrid vehicle is determined. When the hybrid vehicle is operating in different working modes, such as an auxiliary driving mode, a generating mode, a regenerative braking mode, an idle stop mode, and a traditional working mode, the HCU controller determines to turn the DC on or off according to actual needs. -DC controller. ⁇ With the DC-DC control method of the hybrid vehicle of the present invention, the utilization efficiency of electric energy can be improved, the problems in the conventional control method can be solved, and the energy flow of the whole vehicle can be made more reasonable.
  • FIG. 1 is a system structural diagram of a hybrid vehicle according to the present invention.
  • FIG. 2 is a flow chart showing a control method of the DC-DC converter of the present invention when the hybrid vehicle is in the auxiliary drive mode;
  • FIG. 3 is a flow chart of a control method of the DC-DC converter of the present invention when the hybrid vehicle is in a power generation mode;
  • FIG. 4 is a flow chart of a control method of the DC-DC converter of the present invention when the ISG motor is in a regenerative braking mode;
  • Fig. 5 is a flow chart showing the control method of the DC-DC converter of the present invention when the hybrid vehicle is in the idle stop mode.
  • the hybrid vehicle DC-DC control method includes: acquiring an operation mode of the hybrid vehicle according to a state of the ISG motor; according to a working mode of the hybrid vehicle, The HCU controller controls the operating state of the DC-DC converter.
  • 1 is a system structural diagram of a hybrid vehicle according to the present invention.
  • the hybrid vehicle includes an engine management system (EMS: Engine Management System) controller 6, an HCU controller 7, and a battery management system (BMS) controller 8.
  • EMS Engine Management System
  • HCU controller 7 the HCU controller 7
  • BMS battery management system
  • the EMS controller 6, the HCU controller 7, and the BMS controller 8 are connected and communicated through a CAN (Controller Area Network) bus.
  • CAN Controller Area Network
  • the EMS controller 6 is an engine management system that is coupled to the engine 1.
  • the engine 1 and the ISG motor 2 are coaxially connected in parallel.
  • the engine 1 and the ISG motor 2 transmit power to the drive wheels through the clutch 3 and the transmission 4 for driving the wheels 5 to operate.
  • the HCU controller 7 is connected to an inverter 14 and a DC-DC converter 12.
  • the HCU controller 7 can drive the ISG motor 2 to be in a power generating or driving state by the inverter 14 according to the state of the entire vehicle.
  • the HCU controller 7 is also used to control the opening or closing of the DC-DC converter 12. When the DC-DC converter 12 is turned on, the HCU controller 7 can control the output voltage of the DC-DC converter 12.
  • the HCU controller 7 can also determine whether automatic parking is required according to the driver's intention and the vehicle state, and send a shutdown or restart command to the EMS controller 6 via the CAN bus.
  • the inverter 14 is connected to the ISG motor 2, the DC-DC converter 12, and the high voltage battery 13.
  • the inverter 14 When the inverter 14 is driven, the current from the high voltage battery 13 is converted into a three-phase current driven ISG motor 2.
  • the ISG motor 2 When the ISG motor 2 is in the power generation mode or the regenerative braking mode, the inverter 14 can rectify the three-phase current into two-phase currents, which are respectively transmitted to the high voltage battery 13 and the DC-DC converter 12.
  • the DC-DC converter 12 is connected to a high voltage battery 13, a low voltage battery 10, and a vehicle body load 9, respectively.
  • the DC-DC converter 12 is a connector for a high voltage network and a low voltage network, which converts the current of the high voltage network into a voltage current, charges the low voltage battery 10 or supplies power to the body load 9.
  • the low voltage battery 10 is a general vehicle low voltage battery.
  • the low voltage battery 10 provides power to the body load 9 when the inverter 14 outputs a lower voltage or is turned off. When the inverter 14 outputs a higher voltage, the low voltage battery 10 is in a state of charge, receiving power from the high voltage network.
  • the vehicle body load 9 refers to electrical appliances of the hybrid vehicle body, such as an air conditioner, an electric lamp, and the like.
  • the BMS controller 8 is a battery management system of a hybrid vehicle and is connected to the high voltage battery 13.
  • the BMS controller 8 is a high voltage voltage management system that can control the breaking of the high voltage battery 13.
  • the DC-DC control method for a hybrid vehicle uses an ISG motor 2 that integrates power generation and electric functions.
  • the operating mode of the hybrid vehicle is obtained by the state of the ISG motor 2.
  • the HCU controller 7 controls the operating state of the DC-DC converter 12 in accordance with the actual mode of operation in which the hybrid vehicle is located.
  • the HCU controller 7 When the hybrid vehicle is operating in an auxiliary drive mode or an idle stop mode, the HCU controller 7 turns off the DC-DC converter 12 to stop current flow from the high voltage network to the low voltage network.
  • the HCU controller 7 When the hybrid vehicle is operating in a power generation mode or a regenerative braking mode, the HCU controller 7 turns on the DC-DC converter 12 so that current can flow from the high voltage network to the low voltage network while adjusting the DC-DC The output voltage of the converter.
  • the DC-DC converter 12 can be turned on only when the entire vehicle of the hybrid vehicle satisfies the following conditions:
  • the high-voltage battery is in the connected state, and the high-voltage system is in the normal working state;
  • SOC state of charge
  • a flow chart of the DC-DC converter control method of the present invention is when the hybrid vehicle is in the auxiliary drive mode.
  • the auxiliary drive mode means that the engine 1 is mainly powered, and the ISG motor 2 assists the engine 1 to jointly drive the hybrid vehicle.
  • the power of the high voltage battery 13 should be used as much as possible for the drive of the hybrid vehicle.
  • the DC-DC converter 12 should be turned off, and current is not allowed to flow from the high voltage network to the low voltage network.
  • the power of the low voltage network is provided by the low voltage battery 10.
  • control method specifically includes the following steps:
  • Step S20 The control process starts
  • Step S21 determining whether the hybrid vehicle is in the auxiliary drive mode according to the working state of the ISG motor 2, if yes, proceeding to step S22, if no, proceeding to step S23;
  • Step S22 The HCU controller 7 sends an instruction to turn off the DC-DC converter, and turns off the DC-DC converter 12;
  • Step S23 End the control flow.
  • FIG. 3 a flow chart of a DC-DC converter control method according to the present invention is shown when the hybrid vehicle is in a power generation mode.
  • the HCU controller 7 When the hybrid vehicle is in the power generation mode, the HCU controller 7 is required to turn on the DC-DC converter 12 to enable the high voltage network current to flow to the low voltage network, thereby satisfying the power demand of the vehicle body load 9, while Charge the small battery.
  • the output voltage of the DC-DC converter 12 When the output voltage of the DC-DC converter 12 is controlled, the output voltage value U0 is corrected according to the power usage state of the vehicle body load 9, and the output voltage setting value U1 of the DC-DC converter 12 is obtained. .
  • control method specifically includes the following steps:
  • Step S30 The control process starts
  • Step S31 determining whether the hybrid vehicle is in the power generation mode according to the working state of the ISG motor 2, if yes, proceeding to step S32, if no, proceeding to step S37;
  • Step S32 According to the temperature of the low voltage battery 10, the output voltage value U0 of the DC-DC converter 12 is obtained by looking up the table;
  • Step S33 Calculating the power consumption P of the low voltage network;
  • the power consumption P of the low voltage network is equal to the product of the output voltage U0 of the DC-DC converter 12 and the output current 10 of the DC-DC converter. Expressed as:
  • Step S34 Obtain an output voltage correction value Lookup (P) of the DC-DC converter 12 according to the power consumption P of the low-voltage network, and obtain an output of the DC-DC converter 12 obtained by looking up the table.
  • the voltage value U0 is corrected to obtain the output voltage setting value U1 of the DC-DC converter 12;
  • the correction method is: adding the output voltage value U0 to the output voltage correction value Lookup (P) to obtain the output voltage setting value Ul. Expressed as:
  • Step S35 determining whether the DC-DC converter 12 is in an open state, and if so, adjusting an output voltage of the DC-DC converter 12 to the output voltage setting value, proceeding to step S37, and if no, proceeding to the step S36;
  • Step S36 The HCU controller 7 issues an instruction to turn on the DC-DC converter 12 to turn on the DC-DC converter 12;
  • the method further includes: the HCU controller 7 determining the vehicle state of the hybrid vehicle, when the vehicle state satisfies the condition for turning on the DC-DC converter 12
  • the HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to the DC-DC converter.
  • Step S37 End the control flow.
  • FIG. 4 a flow chart of the control method of the DC-DC converter of the present invention when the ISG motor is in the regenerative braking mode.
  • the hybrid vehicle system can participate in braking through the ISG motor 2, thereby recovering part of the braking energy, and converting the kinetic energy of the hybrid vehicle into electrical energy stored in The high voltage battery 13 and the low voltage battery 10 are included.
  • the DC-DC converter 12 should be turned on while its output voltage is adjusted to the maximum.
  • control method specifically includes the following steps:
  • Step S40 The control process starts
  • Step S41 determining, according to the working state of the ISG motor 2, whether the hybrid vehicle is In the regenerative braking mode, if yes, proceed to step S42, if no, proceed to step S46;
  • Step S42 According to the temperature of the small battery, the output voltage value U0 of the DC-DC converter 12 is obtained by looking up the table;
  • Step S43 Correcting the output voltage value U0 to obtain an output voltage setting value U1 of the DC-DC converter 12;
  • the correction method is: adding the output voltage value U0 to the set output voltage correction value U2 to obtain the output voltage setting value Ul. Expressed as:
  • Step S44 determining whether the DC-DC converter 12 is in an open state, if yes, adjusting the output voltage of the DC-DC converter 12 to set the output voltage value, proceeds to step S46; if not, proceeds to step S45;
  • Step S45 The HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to turn on the DC-DC converter 12;
  • the method further includes: the HCU controller 7 determining the vehicle state of the hybrid vehicle, when the vehicle state satisfies the condition for turning on the DC-DC converter 12
  • the HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to the DC-DC converter.
  • Step S46 End the control process.
  • the idle stop mode means that when the HCU controller 7 determines that the driver has a stop intention, the HCU controller 7 issues an instruction that the engine 1 is stopped, so that the engine 1 is in a stop state; when the HCU When the controller 7 determines that the driver has an intention to start, the HCU controller 7 issues a request for automatic restart to put the engine 1 in a normal operating state.
  • the power conversion path may be: from the high voltage battery 13 to the low voltage battery 10, and then to the body load 9 to use electricity.
  • the DC-DC converter 12 should be turned off to prevent the conversion efficiency of electric energy from becoming low.
  • the control method specifically includes the following steps:
  • Step S50 The control process starts
  • Step S51 determining, according to the working state of the ISG motor 2, that the hybrid vehicle is in an idle stop mode, if yes, proceeding to step S52, and if no, proceeding to step S53;
  • Step S52 Turn off the DC-DC converter
  • Step S53 End the control process.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A DC-DC control method for hybrid electric vehicles. The method includes the following steps: determining the operation modes of the hybrid electric vehicle on the state of an ISG (2); and an HCU controller (7) controls a DC-DC converter (12) to turn on or off according to the operation modes.

Description

一种混合动力汽车 DC-DC控制方法  Hybrid electric vehicle DC-DC control method
本申请要求于 2007 年 11 月 7 日提交中国专利局、 申请号为 200710135384.8、 发明名称为"一种混合动力汽车 DC-DC控制方法"的中国专 利申请的优先权， 其全部内容通过引用结合在本申请中。  This application claims priority to Chinese Patent Application No. 200710135384.8, entitled "A DC-DC Control Method for Hybrid Electric Vehicles", filed on November 7, 2007, the entire contents of which is incorporated by reference. In this application.
技术领域 Technical field
本发明属于混合动力汽车控制领域， 实现了混合动力汽车 DC-DC直流变 换器的控制。  The invention belongs to the field of hybrid vehicle control, and realizes the control of the DC-DC converter of the hybrid vehicle.
背景技术 Background technique
能源危机和环境恶化是制约全球发展的重要因素。研究节能、环保的汽车 是緩解能源压力、 降低环境污染的有效手段之一。 混合动力汽车兼顾了内燃机 汽车和纯电动汽车的优点， 具有低油耗、 低排放、 长行驶里程等优点， 是当前 切实可行的一种方案。  The energy crisis and environmental degradation are important factors that constrain global development. Studying energy-efficient and environmentally-friendly vehicles is one of the effective means to alleviate energy pressure and reduce environmental pollution. Hybrid vehicles take into account the advantages of internal combustion engines and pure electric vehicles. They have the advantages of low fuel consumption, low emissions, and long mileage. They are currently a practical solution.
对于并联混合式混合动力汽车通常具有两个电能存储包，分别为高压电能 存储包和低压电能存储包。  For a parallel hybrid hybrid vehicle, there are typically two electrical energy storage packages, a high voltage electrical energy storage package and a low voltage electrical energy storage package.
所述高压电能存储包， 通常是高压电池（HV: High Voltage ), 主要是在 车辆再生制动时， 将车辆的动能转化成电能存储起来， 当车辆需要电机辅助驱 动时再将电能释放出来。  The high-voltage electrical energy storage package, usually a high voltage battery (HV: High Voltage), mainly converts the kinetic energy of the vehicle into electrical energy when the vehicle is regeneratively braked, and then releases the electrical energy when the vehicle requires motor-assisted driving.
所述低压电能存储包， 通常是低压电池（LV: Low Voltage ), 主要给车载 低压网络供电。 为了维持低压电池及低压车载用电， 需要在高压网络和低压网 络之间设置 DC-DC变换器。 所述 DC-DC变换器为直流电压转换器， 负责将 高压网络的电量提供给低压网络。  The low voltage electrical energy storage package, usually a low voltage battery (LV: Low Voltage), mainly supplies power to the vehicle low voltage network. In order to maintain low-voltage batteries and low-voltage on-board power, a DC-DC converter is required between the high-voltage network and the low-voltage network. The DC-DC converter is a DC voltage converter that is responsible for supplying the power of the high voltage network to the low voltage network.
因此， 对混合动力汽车， 如何控制 DC-DC变换器， 对提高电能的使用效 率， 降低整车的油耗， 起到非常重要的作用。  Therefore, how to control the DC-DC converter for a hybrid vehicle plays a very important role in improving the efficiency of power consumption and reducing the fuel consumption of the vehicle.
传统的汽车， 多是将发电机的输出电压设为固定的值， 不依赖于整车的工 况而产生变化。这种控制方法可以满足低压网络的用电需求， 能够维持低压电 池的电量平衡， 但在某些的工况下， 会影响整车的用电效率。  In a conventional automobile, the output voltage of the generator is set to a fixed value, and the change does not depend on the condition of the entire vehicle. This control method can meet the power demand of the low-voltage network and maintain the balance of the power of the low-voltage battery. However, under certain operating conditions, it will affect the power efficiency of the vehicle.
发明内容 Summary of the invention
本发明的目的就是提供一种混合动力汽车 DC-DC控制方法， 特别适合于 电机与发动机同轴并联式混合动力汽车，能够提高电能的利用效率并使整车的 能量流动更为合理。 The object of the present invention is to provide a DC-DC control method for a hybrid vehicle, which is particularly suitable for a coaxial parallel hybrid vehicle of an electric motor and an engine, which can improve the utilization efficiency of electric energy and make the whole vehicle Energy flow is more reasonable.
为实现上述发明目的， 本发明釆用了以下技术方案： 根据所述电动发电一 体式电机（ISG: Integrated Starter Generator )的状态， 获取所述混合动力汽车 的工作模式；根据所述混合动力汽车的工作模式，所述混合动力控制器（HCU: Hybrid Control Unit )控制所述 DC-DC变换器的工作状态。  In order to achieve the above object, the present invention adopts the following technical solution: obtaining an operation mode of the hybrid vehicle according to a state of the integrated electric generator (ISG: Integrated Starter Generator); according to the hybrid vehicle In an operation mode, the hybrid controller (HCU: Hybrid Control Unit) controls an operating state of the DC-DC converter.
由上述技术方案可知，本发明提出了一种根据混合动力汽车的具体工况对 DC-DC变换器进行动态控制的方法。 根据所述 ISG电机的工作状态， 判断所 述混合动力汽车的具体工作模式。当所述混合动力汽车工作在不同工作模式下 时， 如辅助驱动模式、 发电模式、 再生制动模式、 怠速停机模式及传统工作模 式， 所述 HCU控制器根据实际需要判断打开或关闭所述 DC-DC控制器。 釆 用本发明所述混合动力汽车 DC-DC控制方法， 能够提高电能的利用效率， 解 决传统控制方法中的问题， 可以使整车的能量流动更为合理。  As can be seen from the above technical solution, the present invention proposes a method for dynamically controlling a DC-DC converter according to the specific operating conditions of the hybrid vehicle. Based on the operating state of the ISG motor, a specific operating mode of the hybrid vehicle is determined. When the hybrid vehicle is operating in different working modes, such as an auxiliary driving mode, a generating mode, a regenerative braking mode, an idle stop mode, and a traditional working mode, the HCU controller determines to turn the DC on or off according to actual needs. -DC controller.釆 With the DC-DC control method of the hybrid vehicle of the present invention, the utilization efficiency of electric energy can be improved, the problems in the conventional control method can be solved, and the energy flow of the whole vehicle can be made more reasonable.
附图说明 DRAWINGS
图 1为本发明所述混合动力汽车的***结构图；  1 is a system structural diagram of a hybrid vehicle according to the present invention;
图 2为混合动力汽车处于辅助驱动模式时， 本发明所述 DC-DC变换器控 制方法流程图；  2 is a flow chart showing a control method of the DC-DC converter of the present invention when the hybrid vehicle is in the auxiliary drive mode;
图 3为混合动力汽车处于发电模式时， 本发明所述 DC-DC变换器控制方 法流程图；  3 is a flow chart of a control method of the DC-DC converter of the present invention when the hybrid vehicle is in a power generation mode;
图 4为 ISG电机处于再生制动模式时， 本发明所述 DC-DC变换器控制方 法流程图；  4 is a flow chart of a control method of the DC-DC converter of the present invention when the ISG motor is in a regenerative braking mode;
图 5为混合动力汽车处于怠速停机模式时， 本发明所述 DC-DC变换器控 制方法流程图。  Fig. 5 is a flow chart showing the control method of the DC-DC converter of the present invention when the hybrid vehicle is in the idle stop mode.
具体实施方式 detailed description
为了使本发明的目的、技术方案及优点更加清楚明白， 以下结合附图及实 施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅 仅用以解释本发明， 并不用于限定本发明。  The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
本发明实施例所述混合动力汽车 DC-DC控制方法， 所述控制方法包括： 根据所述 ISG电机的状态，获取所述混合动力汽车的工作模式；根据所述混合 动力汽车的工作模式， 所述 HCU控制器控制所述 DC-DC变换器的工作状态。 图 1为本发明所述混合动力汽车的***结构图。 The hybrid vehicle DC-DC control method according to the embodiment of the present invention, the control method includes: acquiring an operation mode of the hybrid vehicle according to a state of the ISG motor; according to a working mode of the hybrid vehicle, The HCU controller controls the operating state of the DC-DC converter. 1 is a system structural diagram of a hybrid vehicle according to the present invention.
如图 1所示 ,所述混合动力汽车包括发动机管理***（ EMS: Engine Management System )控制器 6、 HCU控制器 7、以及电池管理***（ BMS: Battery Management System )控制器 8。 其中， 所述 EMS控制器 6、 HCU控制器 7、 BMS控制器 8通 过控制器局部网 （CAN: Controller Area Network ) 总线进行连接和通信。 As shown in Fig. 1, the hybrid vehicle includes an engine management system (EMS: Engine Management System) controller 6, an HCU controller 7, and a battery management system (BMS) controller 8. The EMS controller 6, the HCU controller 7, and the BMS controller 8 are connected and communicated through a CAN (Controller Area Network) bus.
所述 EMS控制器 6为发动机管理***， 与发动机 1相连。 所述发动机 1 与所述 ISG电机 2釆用同轴并联方式。 所述发动机 1与 ISG电机 2通过离合 器 3及变速器 4将动力传输至驱动轮， 用于驱动车轮 5动作。  The EMS controller 6 is an engine management system that is coupled to the engine 1. The engine 1 and the ISG motor 2 are coaxially connected in parallel. The engine 1 and the ISG motor 2 transmit power to the drive wheels through the clutch 3 and the transmission 4 for driving the wheels 5 to operate.
所述 HCU控制器 7与逆变器 14和 DC-DC变换器 12相连。  The HCU controller 7 is connected to an inverter 14 and a DC-DC converter 12.
所述 HCU控制器 7可以根据整车状态， 通过逆变器 14驱动 ISG电机 2 处于发电或驱动状态。  The HCU controller 7 can drive the ISG motor 2 to be in a power generating or driving state by the inverter 14 according to the state of the entire vehicle.
所述 HCU控制器 7还用于控制所述 DC-DC变换器 12的打开或关闭。 当 所述 DC-DC变换器 12打开时， 所述 HCU控制器 7可以控制所述 DC-DC变 换器 12的输出电压。  The HCU controller 7 is also used to control the opening or closing of the DC-DC converter 12. When the DC-DC converter 12 is turned on, the HCU controller 7 can control the output voltage of the DC-DC converter 12.
所述 HCU控制器 7还可以根据驾驶员的意图及整车状态， 判断是否需要 自动停车， 通过 CAN总线向 EMS控制器 6发送停机或重启命令。  The HCU controller 7 can also determine whether automatic parking is required according to the driver's intention and the vehicle state, and send a shutdown or restart command to the EMS controller 6 via the CAN bus.
所述逆变器 14与所述 ISG电机 2、 DC-DC变换器 12、 以及高压电池 13 相连。 所述逆变器 14在驱动时， 将来自高压电池 13的电流转化成三相电流驱 动 ISG电机 2。 当所述 ISG电机 2处于发电模式或再生制动模式时， 逆变器 14可将三相电流整流成两相电流， 分别传输至高压电池 13 以及所述 DC-DC 变换器 12。  The inverter 14 is connected to the ISG motor 2, the DC-DC converter 12, and the high voltage battery 13. When the inverter 14 is driven, the current from the high voltage battery 13 is converted into a three-phase current driven ISG motor 2. When the ISG motor 2 is in the power generation mode or the regenerative braking mode, the inverter 14 can rectify the three-phase current into two-phase currents, which are respectively transmitted to the high voltage battery 13 and the DC-DC converter 12.
所述 DC-DC变换器 12分别与高压电池 13、 低压电池 10、 以及车身负载 9相连。 所述 DC-DC变换器 12为高压网络和低压网络的连接器， 可以将高压 网络的电流转化成电压电流，给低压电池 10充电或者给车身负载 9提供电源。  The DC-DC converter 12 is connected to a high voltage battery 13, a low voltage battery 10, and a vehicle body load 9, respectively. The DC-DC converter 12 is a connector for a high voltage network and a low voltage network, which converts the current of the high voltage network into a voltage current, charges the low voltage battery 10 or supplies power to the body load 9.
所述低压电池 10为普通车载低压电池。当所述逆变器 14输出较低的电压 或者关闭时， 所述低压电池 10为车身负载 9提供用电。 当所述逆变器 14输出 较高电压时， 低压电池 10处于充电状态， 接受来自高压网络的电能。  The low voltage battery 10 is a general vehicle low voltage battery. The low voltage battery 10 provides power to the body load 9 when the inverter 14 outputs a lower voltage or is turned off. When the inverter 14 outputs a higher voltage, the low voltage battery 10 is in a state of charge, receiving power from the high voltage network.
所述车身负载 9是指所述混合动力汽车车身的电器消耗， 例如空调、 电灯 等。 所述 BMS控制器 8为混合动力汽车的电池管理***，与所述高压电池 13 相连。 所述 BMS控制器 8为高压电压管理***， 可以控制所述高压电池 13 的开断。 The vehicle body load 9 refers to electrical appliances of the hybrid vehicle body, such as an air conditioner, an electric lamp, and the like. The BMS controller 8 is a battery management system of a hybrid vehicle and is connected to the high voltage battery 13. The BMS controller 8 is a high voltage voltage management system that can control the breaking of the high voltage battery 13.
本发明所述混合动力汽车 DC-DC控制方法， 釆用将发电和电动功能集成 于一体的 ISG电机 2。 在所述混合动力汽车工作时， 通过根据所述 ISG电机 2 的状态， 获取所述混合动力汽车的工作模式。根据所述混合动力汽车所处的实 际工作模式， 所述 HCU控制器 7控制所述 DC-DC变换器 12的工作状态。  The DC-DC control method for a hybrid vehicle according to the present invention uses an ISG motor 2 that integrates power generation and electric functions. When the hybrid vehicle is in operation, the operating mode of the hybrid vehicle is obtained by the state of the ISG motor 2. The HCU controller 7 controls the operating state of the DC-DC converter 12 in accordance with the actual mode of operation in which the hybrid vehicle is located.
当所述混合动力汽车工作在辅助驱动模式或怠速停机模式时， 所述 HCU 控制器 7关闭所述 DC-DC变换器 12, 使电流停止由高压网络流向低压网络。  When the hybrid vehicle is operating in an auxiliary drive mode or an idle stop mode, the HCU controller 7 turns off the DC-DC converter 12 to stop current flow from the high voltage network to the low voltage network.
当所述混合动力汽车工作在发电模式或再生制动模式时， 所述 HCU控制 器 7开启所述 DC-DC变换器 12, 使电流可以由高压网络流向低压网络， 同时 调整所述 DC-DC变换器的输出电压。  When the hybrid vehicle is operating in a power generation mode or a regenerative braking mode, the HCU controller 7 turns on the DC-DC converter 12 so that current can flow from the high voltage network to the low voltage network while adjusting the DC-DC The output voltage of the converter.
当所述 HCU控制器 7开启所述 DC-DC变换器时 12, 为了确保***工作 的安全可靠性， 需要先对所述混合动力汽车的整车状态进行判断。 只有当所述 混合动力汽车的整车满足以下条件时， 才能打开所述 DC-DC变换器 12:  When the HCU controller 7 turns on the DC-DC converter 12, in order to ensure the safety and reliability of the system operation, it is necessary to first judge the vehicle state of the hybrid vehicle. The DC-DC converter 12 can be turned on only when the entire vehicle of the hybrid vehicle satisfies the following conditions:
( 1 ) 高压电池处于连接状态， 高压***处于正常的工作状态；  (1) The high-voltage battery is in the connected state, and the high-voltage system is in the normal working state;
( 2 ) 高压电池的荷电深度（SOC: State of Charge ) 大于一定的阔值， 该 阔值是为了确保电池工作在一个理想的 SOC区间，以维持电池的性能及寿命； (2) The state of charge (SOC) of the high voltage battery is greater than a certain threshold, which is to ensure that the battery operates in an ideal SOC interval to maintain the performance and life of the battery;
( 3 )驾驶员无关闭***请求， 点火钥匙未处在 OFF档； (3) The driver does not close the system request, the ignition key is not in the OFF position;
( 4 )若电池处于放电状态， 则电池的放电功率不能超过当前的许用放电功 率；  (4) If the battery is in a discharged state, the discharge power of the battery shall not exceed the current allowable discharge power;
( 5 )电池、 DC-DC变换器及 HCU控制器工作在许可的温度值以下， 确保 ***不会因为高温而造成损坏。  (5) The battery, DC-DC converter and HCU controller work below the permissible temperature value to ensure that the system will not be damaged by high temperatures.
以下结合附图，对上述结合具体工况对 DC-DC变化器 12进行动态控制的 方法进行详细说明。  The method for dynamically controlling the DC-DC variator 12 in combination with the specific operating conditions will be described in detail below with reference to the accompanying drawings.
参见图 2, 为混合动力汽车处于辅助驱动模式时， 本发明所述 DC-DC变 换器控制方法流程图。  Referring to Fig. 2, a flow chart of the DC-DC converter control method of the present invention is when the hybrid vehicle is in the auxiliary drive mode.
所述辅助驱动模式是指， 以所述发动机 1为主动力，所述 ISG电机 2辅助 所述发动机 1共同驱动所述混合动力汽车。 当所述混合动力汽车处于辅助驱动模式时， 应尽可能使所述高压电池 13 的功率完全用于混合动力汽车的驱动。 此时， 应关闭所述 DC-DC变换器 12, 不允许电流由高压网络流向低压网络。 所述低压网络的用电由所述低压电池 10提供。 The auxiliary drive mode means that the engine 1 is mainly powered, and the ISG motor 2 assists the engine 1 to jointly drive the hybrid vehicle. When the hybrid vehicle is in the auxiliary drive mode, the power of the high voltage battery 13 should be used as much as possible for the drive of the hybrid vehicle. At this time, the DC-DC converter 12 should be turned off, and current is not allowed to flow from the high voltage network to the low voltage network. The power of the low voltage network is provided by the low voltage battery 10.
参见图 2所示， 所述控制方法具体包括以下步骤：  Referring to FIG. 2, the control method specifically includes the following steps:
步骤 S20: 控制流程开始；  Step S20: The control process starts;
步骤 S21 : 根据所述 ISG电机 2的工作状态， 判断所述混合动力汽车是否 处于辅助驱动模式， 如果是， 进入步骤 S22, 如果否， 进入步骤 S23;  Step S21: determining whether the hybrid vehicle is in the auxiliary drive mode according to the working state of the ISG motor 2, if yes, proceeding to step S22, if no, proceeding to step S23;
步骤 S22: 所述 HCU控制器 7发送关闭 DC-DC变换器的指令， 关闭所述 DC-DC变换器 12;  Step S22: The HCU controller 7 sends an instruction to turn off the DC-DC converter, and turns off the DC-DC converter 12;
步骤 S23: 结束控制流程。  Step S23: End the control flow.
参见图 3 , 为混合动力汽车处于发电模式时， 本发明所述 DC-DC变换器 控制方法流程图。  Referring to FIG. 3, a flow chart of a DC-DC converter control method according to the present invention is shown when the hybrid vehicle is in a power generation mode.
当所述混合动力汽车处于发电模式时， 需要所述 HCU控制器 7打开所述 DC-DC变换器 12, 使高压网络电流能流向低压网络， 从而满足所述车身负载 9的用电需求，同时对小电池充电。在控制所述 DC-DC变换器 12输出电压时， 然后再根据所述车身负载 9 的用电状况修正所述输出电压值 U0, 得到所述 DC-DC变换器 12的输出电压设定值 Ul。  When the hybrid vehicle is in the power generation mode, the HCU controller 7 is required to turn on the DC-DC converter 12 to enable the high voltage network current to flow to the low voltage network, thereby satisfying the power demand of the vehicle body load 9, while Charge the small battery. When the output voltage of the DC-DC converter 12 is controlled, the output voltage value U0 is corrected according to the power usage state of the vehicle body load 9, and the output voltage setting value U1 of the DC-DC converter 12 is obtained. .
参见图 3所示， 所述控制方法具体包括以下步骤：  Referring to FIG. 3, the control method specifically includes the following steps:
步骤 S30: 控制流程开始；  Step S30: The control process starts;
步骤 S31 : 根据所述 ISG电机 2的工作状态， 判断所述混合动力汽车是否 处于发电模式， 如果是， 进入步骤 S32, 如果否， 进入步骤 S37;  Step S31: determining whether the hybrid vehicle is in the power generation mode according to the working state of the ISG motor 2, if yes, proceeding to step S32, if no, proceeding to step S37;
步骤 S32: 根据所述低压电池 10的温度， 通过查表得出所述 DC-DC变换 器 12的输出电压值 U0;  Step S32: According to the temperature of the low voltage battery 10, the output voltage value U0 of the DC-DC converter 12 is obtained by looking up the table;
所述低压电池 10的温度越低， 所述 DC-DC变换器 12的输出电压值 U0 越高； 所述低压电池 10的温度越高，所述 DC-DC变换器 12的输出电压值 U0 越低。  The lower the temperature of the low voltage battery 10, the higher the output voltage value U0 of the DC-DC converter 12; the higher the temperature of the low voltage battery 10, the higher the output voltage value U0 of the DC-DC converter 12 low.
步骤 S33: 计算低压网络的用电功率 P; 所述低压网络的用电功率 P等于所述 DC-DC变换器 12的输出电压 U0与 所述 DC-DC变换器的输出电流 10的乘积。 用公式表示为： Step S33: Calculating the power consumption P of the low voltage network; The power consumption P of the low voltage network is equal to the product of the output voltage U0 of the DC-DC converter 12 and the output current 10 of the DC-DC converter. Expressed as:
P = U0 10 ( 1 )  P = U0 10 ( 1 )
步骤 S34: 根据所述低压网络的用电功率 P, 通过查表得到所述 DC-DC 变换器 12的输出电压修正值 Lookup ( P ), 对查表得到的所述 DC-DC变换器 12的输出电压值 U0进行修正，得到所述 DC-DC变换器 12的输出电压设定值 U1 ;  Step S34: Obtain an output voltage correction value Lookup (P) of the DC-DC converter 12 according to the power consumption P of the low-voltage network, and obtain an output of the DC-DC converter 12 obtained by looking up the table. The voltage value U0 is corrected to obtain the output voltage setting value U1 of the DC-DC converter 12;
所述修正方法为：将所述输出电压值 U0加上所述输出电压修正值 Lookup ( P )得到所述输出电压设定值 Ul。 用公式表示为：  The correction method is: adding the output voltage value U0 to the output voltage correction value Lookup (P) to obtain the output voltage setting value Ul. Expressed as:
Ul = U0 + Lookup ( P ) ( 2 )  Ul = U0 + Lookup ( P ) ( 2 )
步骤 S35: 判断所述 DC-DC变换器 12是否处于打开状态， 如果是， 调整 所述 DC-DC变换器 12的输出电压为所述输出电压设定值， 进入步骤 S37, 如 果否， 进入步骤 S36;  Step S35: determining whether the DC-DC converter 12 is in an open state, and if so, adjusting an output voltage of the DC-DC converter 12 to the output voltage setting value, proceeding to step S37, and if no, proceeding to the step S36;
步骤 S36: 所述 HCU控制器 7发出打开 DC-DC变换器 12的指令， 打开 所述 DC-DC变换器 12;  Step S36: The HCU controller 7 issues an instruction to turn on the DC-DC converter 12 to turn on the DC-DC converter 12;
在所述 HCU控制器 7发送指令之前， 进一步包括： 所述 HCU控制器 7 对所述混合动力汽车的整车状态进行判断， 当所述整车状态满足打开 DC-DC 变换器 12的条件时， 所述 HCU控制器 7才发送打开 DC-DC变换器 12的指 令至所述 DC-DC变换器。  Before the HCU controller 7 sends the command, the method further includes: the HCU controller 7 determining the vehicle state of the hybrid vehicle, when the vehicle state satisfies the condition for turning on the DC-DC converter 12 The HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to the DC-DC converter.
步骤 S37: 结束控制流程。  Step S37: End the control flow.
参见图 4, 为 ISG电机处于再生制动模式时， 本发明所述 DC-DC变换器 控制方法流程图。  Referring to Fig. 4, a flow chart of the control method of the DC-DC converter of the present invention when the ISG motor is in the regenerative braking mode.
当所述 ISG电机 2处于再生制动模式时，所述混合动力汽车***可以通过 ISG电机 2参与制动， 从而回收部分制动的能量， 并将所述混合动力汽车的动 能转换成电能存储在所述高压电池 13及所述低压电池 10中。此时，应该打开 所述 DC-DC变换器 12, 同时将其输出电压调整至最大。  When the ISG motor 2 is in the regenerative braking mode, the hybrid vehicle system can participate in braking through the ISG motor 2, thereby recovering part of the braking energy, and converting the kinetic energy of the hybrid vehicle into electrical energy stored in The high voltage battery 13 and the low voltage battery 10 are included. At this time, the DC-DC converter 12 should be turned on while its output voltage is adjusted to the maximum.
参见图 3所示， 所述控制方法具体包括以下步骤：  Referring to FIG. 3, the control method specifically includes the following steps:
步骤 S40: 控制流程开始；  Step S40: The control process starts;
步骤 S41 : 根据所述 ISG电机 2的工作状态，判断所述混合动力汽车是否 处于再生制动模式， 如果是， 进入步骤 S42, 如果否， 进入步骤 S46; Step S41: determining, according to the working state of the ISG motor 2, whether the hybrid vehicle is In the regenerative braking mode, if yes, proceed to step S42, if no, proceed to step S46;
步骤 S42: 根据小电池的温度，通过查表得出所述 DC-DC变换器 12的输 出电压值 U0;  Step S42: According to the temperature of the small battery, the output voltage value U0 of the DC-DC converter 12 is obtained by looking up the table;
步骤 S43: 对所述输出电压值 U0进行修正， 得到所述 DC-DC变换器 12 的输出电压设定值 U1 ;  Step S43: Correcting the output voltage value U0 to obtain an output voltage setting value U1 of the DC-DC converter 12;
所述修正方法为： 将所述输出电压值 U0加上设定的输出电压修正值 U2, 得到所述输出电压设定值 Ul。 用公式表示为：  The correction method is: adding the output voltage value U0 to the set output voltage correction value U2 to obtain the output voltage setting value Ul. Expressed as:
Ul = U0 + U2 ( 2 ) 其中， 所述输出电压修正值 U2的获取方法可以与上述 Lookup ( P ) 的获 取方法相同。  Ul = U0 + U2 ( 2 ) wherein the acquisition method of the output voltage correction value U2 can be the same as the acquisition method of the above Lookup (P).
步骤 S44: 判断所述 DC-DC变换器 12是否处于打开状态， 如果是， 调整 所述 DC-DC变换器 12的输出电压为设定输出电压值，进入步骤 S46;如果否， 进入步骤 S45;  Step S44: determining whether the DC-DC converter 12 is in an open state, if yes, adjusting the output voltage of the DC-DC converter 12 to set the output voltage value, proceeds to step S46; if not, proceeds to step S45;
步骤 S45: 所述 HCU控制器 7发送打开 DC-DC变换器 12的指令， 打开 所述 DC-DC变换器 12;  Step S45: The HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to turn on the DC-DC converter 12;
在所述 HCU控制器 7发送指令之前， 进一步包括： 所述 HCU控制器 7 对所述混合动力汽车的整车状态进行判断， 当所述整车状态满足打开 DC-DC 变换器 12的条件时， 所述 HCU控制器 7才发送打开 DC-DC变换器 12的指 令至所述 DC-DC变换器。  Before the HCU controller 7 sends the command, the method further includes: the HCU controller 7 determining the vehicle state of the hybrid vehicle, when the vehicle state satisfies the condition for turning on the DC-DC converter 12 The HCU controller 7 sends an instruction to turn on the DC-DC converter 12 to the DC-DC converter.
步骤 S46: 结束控制流程。  Step S46: End the control process.
参见图 5, 为混合动力汽车处于怠速停机模式时， 本发明所述 DC-DC变 换器控制方法流程图。 所述怠速停机模式， 是指当所述 HCU控制器 7判断得 到驾驶员有停机意图时， 所述 HCU控制器 7发出发动机 1停机的指令， 使所 述发动机 1处于停机状态； 当所述 HCU控制器 7判断得到驾驶员有启动的意 图时， 所述 HCU控制器 7发出自动重起的请求， 使所述发动机 1处于正常运 行状态。  Referring to Fig. 5, a flow chart of the DC-DC converter control method of the present invention is shown when the hybrid vehicle is in the idle stop mode. The idle stop mode means that when the HCU controller 7 determines that the driver has a stop intention, the HCU controller 7 issues an instruction that the engine 1 is stopped, so that the engine 1 is in a stop state; when the HCU When the controller 7 determines that the driver has an intention to start, the HCU controller 7 issues a request for automatic restart to put the engine 1 in a normal operating state.
当所述混合动力汽车处于怠速停机模式时， 电能的转换途径可能为： 从高 压电池 13到低压电池 10, 再到车身负载 9用电。 此时， 应关闭所述 DC-DC 变换器 12, 防止电能的转换效率变低。 参见图 5所示， 所述控制方法具体包括以下步骤： When the hybrid vehicle is in the idle stop mode, the power conversion path may be: from the high voltage battery 13 to the low voltage battery 10, and then to the body load 9 to use electricity. At this time, the DC-DC converter 12 should be turned off to prevent the conversion efficiency of electric energy from becoming low. Referring to FIG. 5, the control method specifically includes the following steps:
步骤 S50: 控制流程开始；  Step S50: The control process starts;
步骤 S51 : 根据所述 ISG电机 2的工作状态， 判断所述混合动力汽车处于 怠速停机模式， 如果是， 进入步骤 S52 , 如果否， 进入步骤 S53 ;  Step S51: determining, according to the working state of the ISG motor 2, that the hybrid vehicle is in an idle stop mode, if yes, proceeding to step S52, and if no, proceeding to step S53;
步骤 S52: 关闭所述 DC-DC变换器；  Step S52: Turn off the DC-DC converter;
步骤 S53: 结束控制流程。  Step S53: End the control process.
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、等同替换和改进等， 均应包含在本发明 的保护范围之内。  The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

权 利 要 求 Rights request
1、一种混合动力汽车 DC-DC控制方法，其特征在于：所述控制方法包括： 根据所述 ISG电机的状态， 获取所述混合动力汽车的工作模式； 根据所述混合动力汽车的工作模式， 所述 HCU控制器控制所述 DC-DC 变换器的工作状态。  A hybrid vehicle DC-DC control method, characterized in that: the control method comprises: acquiring an operating mode of the hybrid vehicle according to a state of the ISG motor; according to an operating mode of the hybrid vehicle The HCU controller controls an operating state of the DC-DC converter.
2、 根据权利要求 1所述的控制方法， 其特征在于， 当所述混合动力汽车 工作在辅助驱动模式时， 所述 HCU控制器关闭所述 DC-DC变换器。  2. The control method according to claim 1, wherein the HCU controller turns off the DC-DC converter when the hybrid vehicle is operating in an auxiliary drive mode.
3、 根据权利要求 1所述的控制方法， 其特征在于， 当所述混合动力汽车 工作在发电模式时， 所述 HCU控制器开启所述 DC-DC变换器。  3. The control method according to claim 1, wherein the HCU controller turns on the DC-DC converter when the hybrid vehicle is operating in a power generation mode.
4、 根据权利要求 3所述的控制方法， 其特征在于， 所述 HCU控制器开 启所述 DC-DC变换器， 包括以下步骤：  4. The control method according to claim 3, wherein the HCU controller turns on the DC-DC converter, and the following steps are included:
根据低压电池的温度， 查表得到所述 DC-DC变换器的输出电压值； 对所述 DC-DC变换器的输出电压值进行修正， 得到所述 DC-DC变换器 的输出电压设定值；  Obtaining an output voltage value of the DC-DC converter according to a temperature of the low-voltage battery; correcting an output voltage value of the DC-DC converter to obtain an output voltage setting value of the DC-DC converter ;
所述 HCU开启所述 DC-DC变换器， 并控制其输出电压为所述输出电压 设定值。  The HCU turns on the DC-DC converter and controls its output voltage to be the output voltage set value.
5、 根据权利要求 4所述的控制方法， 其特征在于， 釆用下述步骤对所述 DC-DC变换器的输出电压值进行修正：  5. The control method according to claim 4, wherein the output voltage value of the DC-DC converter is corrected by the following steps:
用所述 DC-DC变换器的输出电压乘以所述 DC-DC变换器的输出电流， 将得到的乘积作为低压网络的用电功率；  Multiplying the output voltage of the DC-DC converter by the output current of the DC-DC converter, and using the obtained product as the power consumption of the low-voltage network;
根据所述用电功率， 查表得到所述 DC-DC变换器的输出电压修正值； 将所述输出电压值加上所述输出电压修正值， 得到所述输出电压设定值。  Obtaining an output voltage correction value of the DC-DC converter according to the power consumption, and adding the output voltage value to the output voltage correction value to obtain the output voltage setting value.
6、 根据权利要求 1所述的控制方法， 其特征在于， 当所述混合动力汽车 工作在再生制动模式时， 所述 HCU控制器开启所述 DC-DC变换器。  6. The control method according to claim 1, wherein the HCU controller turns on the DC-DC converter when the hybrid vehicle is operating in a regenerative braking mode.
7、 根据权利要求 6所述的控制方法， 其特征在于， 所述 HCU控制器开 启所述 DC-DC变换器， 包括以下步骤：  7. The control method according to claim 6, wherein the HCU controller turns on the DC-DC converter, and the following steps are included:
根据小电池的温度， 查表得出所述 DC-DC变换器的输出电压值； 对所述 DC-DC变换器的输出电压值进行修正， 得到所述 DC-DC变换器 的输出电压设定值； 所述 HCU控制器开启所述 DC-DC变换器， 并控制其输出电压为所述输 出电压设定值。 Obtaining an output voltage value of the DC-DC converter according to a temperature of the small battery; correcting an output voltage value of the DC-DC converter to obtain an output voltage setting of the DC-DC converter value; The HCU controller turns on the DC-DC converter and controls its output voltage to be the output voltage set value.
8、 根据权利要求 7所述的控制方法， 其特征在于， 釆用下述步骤对所述 DC-DC变换器的输出电压值进行修正：  8. The control method according to claim 7, wherein the output voltage value of the DC-DC converter is corrected by the following steps:
设定 DC-DC变换器的输出电压修正值；  Setting an output voltage correction value of the DC-DC converter;
将所述输出电压值加上所述输出电压修正值， 得到所述输出电压设定值。 The output voltage value is added to the output voltage correction value to obtain the output voltage setting value.
9、 根据权利要求 1所述的控制方法， 其特征在于， 当所述混合动力汽车 工作在怠速停机模式时， 所述 HCU控制器关闭所述 DC-DC变换器。 9. The control method according to claim 1, wherein the HCU controller turns off the DC-DC converter when the hybrid vehicle is operating in an idle stop mode.
10、 根据权利要求 3、 4、 5、 6、 7、 或 8所述的控制方法， 其特征在于： 在所述 HCU控制器开启所述 DC-DC变换器之前， 进一步包括：  The control method according to claim 3, 4, 5, 6, 7, or 8, wherein: before the HCU controller turns on the DC-DC converter, the method further includes:
所述 HCU控制器判断整车满足以下的条件：  The HCU controller determines that the vehicle satisfies the following conditions:
( 1 ) 高压电池处于连接状态， 高压***处于正常的工作状态；  (1) The high-voltage battery is in the connected state, and the high-voltage system is in the normal working state;
( 2 ) 高压电池的荷电深度大于一定的阔值；  (2) The charging depth of the high voltage battery is greater than a certain threshold;
( 3 )驾驶员无关闭***请求， 点火钥匙未处在 OFF档；  (3) The driver does not close the system request, the ignition key is not in the OFF position;
( 4 )若电池处于放电状态， 则电池的放电功率不能超过当前的许用放电功 率；  (4) If the battery is in a discharged state, the discharge power of the battery shall not exceed the current allowable discharge power;
( 5 ) 电池、 DC-DC变换器及 HCU控制器工作在许可的温度值以下， 确保 ***不会因为高温而造成损坏。  (5) The battery, DC-DC converter and HCU controller operate below the permissible temperature values to ensure that the system does not damage due to high temperatures.
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