CN107806387B - 防止轻度混合动力电动车辆的发动机压缩自燃的方法和装置 - Google Patents

防止轻度混合动力电动车辆的发动机压缩自燃的方法和装置 Download PDF

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CN107806387B
CN107806387B CN201611203688.9A CN201611203688A CN107806387B CN 107806387 B CN107806387 B CN 107806387B CN 201611203688 A CN201611203688 A CN 201611203688A CN 107806387 B CN107806387 B CN 107806387B
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electric vehicle
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CN107806387A (zh
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张和镕
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Hyundai Motor Co
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    • 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
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • 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
    • B60W30/18—Propelling the vehicle
    • B60W30/192—Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
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    • 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
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
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    • 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
    • B60K6/22—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 apparatus, components or means specially adapted for HEVs
    • B60K6/26—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 apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B60K2006/268—Electric drive motor starts the engine, i.e. used as starter motor
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal 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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
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    • B60Y2200/92—Hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B60Y2400/303—Speed sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/022—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/041—Starter speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
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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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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract

一种防止轻度混合动力电动车辆的发动机压缩自燃的方法和装置，所述方法包括下述步骤：确定点火开关是否设定至OFF位置；当点火开关设定至OFF位置时，确定发动机停止条件是否满足；当发动机停止条件满足时，根据发动机转速确定完成轻度混合动力起动机和发电机(MHSG)的旋转的目标时间点；以及从发动机停止条件满足的时间点到目标时间点，控制MHSG的转速以减小发动机的转速。

Description

防止轻度混合动力电动车辆的发动机压缩自燃的方法和装置
相关申请的交叉引用
本申请要求于2016年9月9日在韩国知识产权局提交的韩国专利申请第10-2016-0116719号的优先权权益，该申请的全部内容通过引用纳入本文。
技术领域
本申请涉及防止轻度混合动力电动车辆的发动机压缩自燃(dieseling)的方法和装置。
背景技术
一般而言，混合动力电动车辆使用内燃机和电池电力两者。也即，混合动力电动车辆有效地结合并利用内燃机的动力和电机的动力两者。
混合动力电动车辆可以根据发动机和电机之间的动力分配比(power shareratio)而分类为轻度类型和重度类型。在轻度类型的混合动力电动车辆(下文中，称作轻度混合动力电动车辆)中，设置了替代交流发电机而起动发动机或者通过发动机的输出而发电的轻度混合动力起动机和发电机(mild hybrid starter and generator，MHSG)。在重度类型的混合动力电动车辆中，分别设置了起动发动机或通过发动机的输出而发电的起动机与发电机一体机(integrated starter and generator，ISG)以及驱动车辆的驱动电机。
轻度混合动力电动车辆不具有仅利用MHSG的扭矩来驱动车辆的行驶模式，但是可以利用MHSG而根据行驶状态来辅助发动机扭矩，并且可以通过再生制动来对电池充电(例如，48V的电池)。因此，轻度混合动力电动车辆的燃料消耗能够得到改善。
压缩自燃指的是发动机的异常燃烧现象，其在燃烧室中的剩余燃料自发地作为点火源而点燃时发生，并且也可以被称作为续燃(run-on)。在发动机过热的状态下，当点火开关关断时，可能发生压缩自燃。当压缩自燃发生时，如果发动机继续运转，则发生震动，且因此必须去除该震动。
当点火开关关断时，柴油发动机关断空气控制阀(ACV)来阻止空气流入发动机，从而防止压缩自燃。然而，由于ACV的操作所导致的声音在驾驶员听来是噪音，并且通过ACV的操作来阻止空气流入是需要一定量的时间的。
公开于背景技术部分的上述信息仅仅旨在加深对本申请背景技术的理解，因此其包含的信息并不构成在本国已为本领域技术人员所公知的现有技术。
发明内容
本申请已致力于提供一种防止轻度混合动力电动车辆的发动机压缩自燃的方法和装置，其优点在于，通过控制MHSG的转速而能够防止发动机压缩自燃。
本申请的示例性实施方案提供一种防止轻度混合动力电动车辆的发动机压缩自燃的方法，所述方法包括：确定点火开关是否设定至OFF位置；当点火开关设定值OFF位置时，确定发动机停止条件是否满足；当发动机停止条件满足时，根据发动机转速确定完成轻度混合动力起动机和发电机(MHSG)的旋转的目标时间点；以及从发动机停止条件满足的时间点到所述目标时间点，控制MHSG的转速以减小发动机的转速。
如果发动机转速等于或小于第一参考转速，并且轻度混合动力电动车辆的速度等于或小于第二参考速度，则发动机停止条件可以满足。
可以基于在发动机停止条件满足的时间点的发动机转速来确定目标时间点。
本申请的另一实施方案提供一种轻度混合动力电动车辆的发动机的压缩自燃防止装置，所述装置包括：轻度混合动力起动机和发电机(MHSG)，其起动发动机，或者通过发动机的输出而发电；点火开关，其包括多个触点；数据检测器，其检测用于防止发动机压缩自燃的数据；以及控制器，当点火开关设定至OFF触点时，所述控制器基于所述数据来确定发动机停止条件是否满足。当发动机停止条件满足时，控制器根据发动机转速来确定完成MHSG的旋转的目标时间点，并且从发动机停止条件满足的时间点到所述目标时间点，所述控制器控制MHSG的转速以减小发动机转速。
如果发动机转速等于或小于第一参考转速，并且轻度混合动力电动车辆的速度等于或小于第二参考速度，则发动机停止条件可以满足。
控制器可以根据在发动机停止条件满足的时间点的发动机转速来确定目标时间点。
数据检测器可以包括：发动机转速传感器，其检测发动机转速；以及车辆速度传感器，其检测轻度混合动力电动车辆的速度。
如上所述，根据本申请的示例性实施方案，通过控制MHSG的转速，能够防止发动机压缩自燃。
附图说明
图1为示出根据本申请的示例性实施方案的轻度混合动力电动车辆的框图。
图2为示出根据本申请的示例性实施方案的轻度混合动力电动车辆的发动机的压缩自燃防止装置的框图。
图3A和图3B为示出根据本申请的示例性实施方案的用于控制MHSG的运转的电路结构的图。
图4为示出根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法的流程图。
图5为示出根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法的示图。
具体实施方式
下文将参考所附附图对本申请进行更为全面的描述，在这些附图中显示了本申请的示例性实施方案。如本领域技术人员将意识到的那样，可以对所描述的实施方案进行各种不同方式的修改，所有这些修改将不脱离本发明的精神或范围。
附图和说明书应当被认为本质上是说明性的而非限制性的。在整个说明书中，相同的附图标记表示相同的元件。
此外，在附图中，每个元件的尺寸和厚度进行随机的表示以获得更好地理解和说明的简化，并且本申请并不限于此。
图1为示出根据本申请的示例性实施方案的轻度混合动力电动车辆的框图。
如图1所示，根据本申请的示例性实施方案的轻度混合动力电动车辆包括发动机10、变速器20、轻度混合动力起动机和发电机(MHSG)30、电池40、差速齿轮装置50和车轮60。
发动机10通过燃烧燃料来产生扭矩，并且可以使用各种发动机，例如汽油发动机、柴油发动机和液化石油喷射(liquefied petroleum injection，LPI)发动机。
在轻度混合动力电动车辆的动力输送系统中，发动机10的扭矩传输至变速器20的输入轴，并且从变速器20的输出轴输出的扭矩经由差速齿轮装置50而传输至轮轴。随着轮轴旋转车轮60，轻度混合动力电动车辆通过发动机10的扭矩而行驶。
变速器20可以是自动变速器或手动变速器。在自动变速器中，根据轻度混合动力电动车辆的速度和加速踏板的位置驱动多个电磁阀，从而对液压压力进行控制，目标挡位的换挡齿轮被操作，并且因此自动地执行换挡。在手动变速器中，通过驾驶员踩踏在离合器踏板上的同时将换挡杆移动至所需挡位的操纵来执行换挡。
MHSG 30将电能转换为机械能，或者将机械能转换为电能。也即，MHSG 30可以起动发动机10或者通过发动机10的输出来发电。此外，MHSG 30可以辅助发动机10的扭矩。轻度混合动力电动车辆可以在将发动机10的燃烧扭矩作为主动力的同时将MHSG 30的扭矩用作辅助动力。发动机10和MHSG 30可以通过带32连接。
电池40可以将电力供应至MHSG 30，或者可以通过经由MHSG 30回收的电力而得到充电。电池40为高压电池(例如，48V的电池)，并且可以是锂离子电池。轻度混合动力电动车辆可以进一步包括低压DC-DC变换器(LDC)以及低电压电池(例如，12V的电池)，所述低压DC-DC变换器将从电池40供应的电压转换为低电压，所述低压电池将低电压供应至利用低电压的电子设备负载(例如，前照灯、空调)。
图2为示出根据本申请的示例性实施方案的轻度混合动力电动车辆的发动机的压缩自燃防止装置的框图。
如图2所示，根据本示例性实施方案的轻度混合动力电动车辆的发动机的压缩自燃防止装置100可以包括点火开关70、数据检测器80、控制器90和MHSG 30。
点火开关70可以包括多个触点。所述多个触点可以包括OFF触点、ACC触点、ON触点和START触点。当选择OFF触点时，发动机10停止运行。当选择ACC触点时，可以使用附件设备，例如收音机。当选择ON触点时，可以使用利用电池40的电压的电子设备。当选择START触点时，发动机10起动。点火开关70的触点可以通过起动钥匙或起动按钮而得到选择。
数据检测器80检测用于防止发动机10压缩自燃的数据，并且数据检测器80检测到的数据传输至控制器90。数据检测器80可以包括发动机转速传感器82和车辆速度传感器84。数据检测器80可以进一步包括用于控制轻度混合动力电动车辆的检测器(例如，加速踏板位置检测器、制动踏板位置检测器)。
发动机转速传感器82检测发动机10的转速，并且将其信号传输至控制器90。
车辆速度传感器84检测轻度混合动力电动车辆的速度，并且将其信号传输至控制器90。
控制器90可以基于点火开关70和数据检测器80的信号来控制MHSG 30的运转。控制器90可以利用至少一个根据程序而运行的处理器来实现，且该程序可以包括用于执行被包括在根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法(将在随后描述)中的各个步骤的一系列指令。
图3A和图3B为示出根据本申请的示例性实施方案的用于控制MHSG的运转的电路结构的图。
如图3A和图3B所示，控制器90可以通过H-桥电路结构来控制MHSG 30的运转。控制器90可以包括多个开关元件S1至S4，并且可以根据开关元件S1至S4的开关操作来控制MHSG30的运转。也即，MHSG 30可以根据开关元件S1至S4的开关操作而在正向旋转或者在负向旋转，通过惯性旋转或者可以停止。控制器90可以基于点火开关70和数据检测器80的信号来确定脉冲宽度调制(“PWM”)值(duty)。当占空比(开关元件的开关周期和开关元件的接通时间的比)为0％时，PWM值可以为0，而当占空比为100％时，PWM值可以为1。开关元件S1至S4可以根据所确定的PWM值来执行开关操作，从而控制MHSG 30的转速。
下文中，将具体参考图4和图5来对根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法进行详细描述。
图4为示出根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法的流程图，而图5为示出根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法的示图。
参考图4和图5，根据本申请的示例性实施方案的防止轻度混合动力电动车辆的发动机的压缩自燃方法通过检测用于防止发动机10压缩自燃的数据(S100)而开始。也即，发动机转速传感器82检测发动机10的转速，而车辆速度传感器84检测轻度混合动力电动车辆的速度。
控制器90确定点火开关70的OFF触点是否得到选择(S110)。
如果在步骤S110点火开关70的OFF触点没有得到选择，则终止根据本示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法。
如果在步骤S110点火开关70的OFF触点得到选择，则控制器90确定是否满足发动机停止条件(S120)。如果发动机10的转速等于或小于第一参考转速，并且如果轻度混合动力电动车辆的速度等于或小于第二参考速度，则发动机停止条件可以满足。第一参考转速可以设定为这样的转速：本领域技术人员在考虑发动机10的空转RPM的情况下而确定的优选转速。第二参考速度可以设定为这样的速度，本领域技术人员为了确定轻度混合动力电动车辆的停车状态而确定的优选速度。
如果在步骤S120没有满足发动机停止条件，则终止根据本示例性实施方案的防止轻度混合动力电动车辆的发动机压缩自燃的方法。
如果在步骤S120满足发动机停止条件，则控制器90可以基于发动机10的转速而确定完成MHSG30的旋转的目标时间点t目标(S130)。也即，控制器90可以基于在满足发动机停止条件的时间点t0的发动机10的转速而确定完成发动机10和MHSG 30的旋转的目标时间点t目标。例如，随着在满足发动机停止条件的时间点t0的发动机10的转速增大，目标时间点t目标可以增大。
从满足发动机停止条件的时间点t0到目标时间点t目标，控制器90控制MHSG 30的转速以减小发动机10的转速(S140)。因此，从初始时间点t0到目标时间点t目标，发动机10的转速平稳地减小。
控制器可以指包括存储器和处理器的硬件设备，所述处理器配置为执行解释为算法结构的一个或更多步骤。存储器存储算法步骤，而处理器具体地执行算法步骤，以执行所述过程中的一个或多个过程。
此外，所公开的方法可以通过在计算机可读装置上的非暂时性计算机可读介质实现，所述非暂时性计算机可读介质包括通过处理器、控制器等执行的可执行程序指令。计算机可读介质的示例(即便为非限制性的)包括ROM、RAM、CD-ROM、磁带、软盘、闪存盘、智能卡、和光学数据存储设备。
如上所述，根据本申请的示例性实施方案，通过控制MHSG 30的转速，能够防止发动机10压缩自燃。
虽然参考目前被视为是实际的示例性实施方案来描述本申请，应理解本发明并不限于所公开的实施方案，相反，本发明旨在覆盖包括在所附权利要求的精神和范围之内的各种修改形式和等效形式。

Claims (7)

1.一种防止轻度混合动力电动车辆的发动机压缩自燃的方法，所述方法包括下述步骤：
确定点火开关是否设定至OFF位置；
当点火开关设定至OFF位置时，确定发动机停止条件是否满足；
当发动机停止条件满足时，根据发动机转速确定发动机转速为零的情况下完成轻度混合动力起动机和发电机的旋转的目标时间点t目标；以及
从发动机停止条件满足的时间点t0到所述目标时间点t目标，控制轻度混合动力起动机和发电机的转速，从而减小发动机的转速。
2.根据权利要求1所述的防止轻度混合动力电动车辆的发动机压缩自燃的方法，其中，如果发动机转速等于或小于第一参考转速，并且轻度混合动力电动车辆的速度等于或小于第二参考速度，则发动机停止条件满足。
3.根据权利要求1所述的防止轻度混合动力电动车辆的发动机压缩自燃的方法，其中，基于在发动机停止条件满足的时间点的发动机转速来确定目标时间点。
4.一种轻度混合动力电动车辆的发动机的压缩自燃防止装置，所述压缩自燃防止装置包括：
轻度混合动力起动机和发电机，其起动发动机或者通过发动机的输出而发电；
点火开关，其包括多个触点；
数据检测器，其检测用于防止发动机压缩自燃的数据；
控制器，当点火开关设定至OFF触点时，所述控制器基于所述数据确定发动机停止条件是否满足，
其中，当发动机停止条件满足时，所述控制器根据发动机转速确定发动机转速为零的情况下完成轻度混合动力起动机和发电机的旋转的目标时间点t目标，并且从发动机停止条件满足的时间点t0到所述目标时间点t目标，所述控制器控制轻度混合动力起动机和发电机的转速，从而减小发动机转速。
5.根据权利要求4所述的轻度混合动力电动车辆的发动机的压缩自燃防止装置，其中，如果发动机转速等于或小于第一参考转速，并且轻度混合动力电动车辆的速度等于或小于第二参考速度，则发动机停止条件满足。
6.根据权利要求4所述的轻度混合动力电动车辆的发动机的压缩自燃防止装置，其中，所述控制器基于在发动机停止条件满足的时间点的发动机转速来确定目标时间点。
7.根据权利要求4所述的轻度混合动力电动车辆的发动机的压缩自燃防止装置，其中，所述数据检测器包括：
发动机转速传感器，其检测发动机转速；
车辆速度传感器，其检测轻度混合动力电动车辆的速度。
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