CN109941284B - 包括isg功能的车辆控制方法及其控制装置 - Google Patents
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Abstract
一种包括ISG功能的车辆控制方法,包括:控制器接收用于执行ISG功能所需的检测信号的步骤;和控制器响应于检测信号,控制车辆进入根据ISG功能切断向车辆发动机的燃料供给并在车辆减速或停止时停止发动机的ISG状态的步骤,检测信号包括:燃料切断信号,在车辆减速时成为开启状态且在发动机的基准转速时成为关闭状态,指示是否切断向发动机的燃料供给;齿轮接合信号,指示是否接合包含于车辆变速器的齿轮;和制动踏板信号,指示车辆制动踏板操作与否,控制器根据从开启状态过渡到关闭状态前的燃料切断信号、开启状态的齿轮接合信号和开启状态的制动踏板信号,生成ISG进入信号,根据ISG进入信号使车辆进入ISG状态。
Description
技术领域
本发明涉及车辆,更详细而言,涉及包括ISG(怠速启停;Idle Stop and Go)功能的车辆控制方法及其控制装置。
背景技术
全球都在为降低车辆燃料燃烧时所产生的二氧化碳浓度而努力,与此同时,为适应高油价时代,也在摸索着能够提高车辆燃料经济性的方法。
作为符合这种努力的一种方法,提出了ISG(怠速启停,Idle Stop&Go)系统。实际上已经证明了通过ISG系统能够降低车辆的二氧化碳产生量,同时还能够实现提高燃料经济性的效果。
此处,ISG系统是在车辆减速或停止时使发动机的驱动停止从而使发动机不燃烧,之后在车辆起步时再驱动发动机而使车辆能够移动的发动机控制方式。
ISG系统接收车辆的车速、发动机转速、冷却水温等信息输入,从而在怠速时下令使发动机停止。换言之,ISG系统在车辆因在市区行驶时等待信号灯等原因而减速或停止时,自动停止空转中的发动机,并在规定时间后车辆要起步(start)时,重启发动机。ISG系统也被称为怠速停止控制装置等。ISG系统在实际燃料经济性模式中能够获得大约5~15%左右的燃料经济性效果。搭载有这种ISG系统的车辆被称为ISG车辆。
这种ISG系统在车辆减速或停车时因为不执行发动机燃烧,所以不使用燃料,从而能够提高车辆燃料经济性,同时能够减少二氧化碳排放浓度。
这种ISG系统包括利用电动马达起动发动机的方式和利用液压马达起动发动机的方式。常用于乘用车的方式是将电动马达用作起动机的方式。
本背景技术章节所记载的事项仅用于增加对发明背景的理解,该章节可能包括不属于本领域技术人员所公知的现有技术的事项。
发明内容
本发明要解决的技术问题(目的)在于,提供一种具有ISG(怠速启停)功能的车辆控制方法及其控制装置,其能够进行控制使得在车辆减速时切断供给到发动机的燃料(fuel cut)后,将燃料切断状态维持到车辆停止时为止。
为了解决(达成)上述技术问题,本发明实施例的包括ISG(怠速启停)功能的车辆控制方法可以包括:控制器接收执行上述ISG功能所需的检测信号的步骤;和上述控制器响应于上述检测信号,控制上述车辆使其进入ISG状态的步骤,在上述ISG状态中根据上述ISG功能切断向上述车辆的发动机的燃料供给并在上述车辆减速或停止时使上述发动机停止,其中上述检测信号包括:燃料切断信号,在上述车辆减速时成为开启(on)状态且在上述发动机的基准转速时成为关闭(off)状态,指示是否切断向上述发动机的燃料供给;齿轮接合信号,指示是否接合包含于上述车辆变速器的齿轮;和制动踏板信号,指示上述车辆的制动踏板操作与否,上述控制器根据从开启(on)状态过渡到关闭(off)状态之前的上述燃料切断信号、开启(on)状态的齿轮接合信号和开启(on)状态的制动踏板信号,来生成ISG进入信号,并根据上述ISG进入信号使上述车辆进入上述ISG状态。
上述发动机的基准转速可以为大于上述发动机的怠速(idle)RPM(转/分,revolutions per minute)且近似于上述怠速RPM的值,例如比怠速RPM大预定值。
在上述燃料切断信号为开启(on)状态时,上述变速器的齿轮可以为接合状态。
上述包括ISG功能的车辆控制方法还可以包括:上述控制器判断上述制动踏板信号是否从上述开启(on)状态转换到关闭(off)状态的步骤,在上述制动踏板信号转换到关闭(off)状态时,上述控制器解除上述ISG状态。
上述变速器可以包括自动变速器。
为了解决上述技术问题,本发明实施例的包括ISG(怠速启停)功能的车辆的控制装置可以包括:驱动上述车辆的发动机的起动发电机;和接收执行上述ISG功能所需的检测信号的控制器,其中上述控制器响应于上述检测信号,控制上述车辆使其进入ISG状态,并在上述ISG状态解除时使上述起动发电机工作,在上述ISG状态中根据上述ISG功能切断向上述车辆的发动机的燃料供给并在上述车辆减速或停止时使上述发动机停止,上述检测信号包括:燃料切断信号,上述车辆减速时成为开启(on)状态且在上述发动机的基准转速时成为关闭(off)状态,指示是否切断向上述发动机的燃料供给;齿轮接合信号,指示是否接合包含于上述车辆变速器的齿轮;和制动踏板信号,指示上述车辆的制动踏板操作与否,上述控制器根据从开启(on)状态过渡到关闭(off)状态之前的上述燃料切断信号、开启(on)状态的齿轮接合信号和开启(on)状态的制动踏板信号,来生成ISG进入信号,并根据上述ISG进入信号使上述车辆进入上述ISG状态。
上述发动机的基准转速可以为大于上述发动机的怠速(idle)RPM(转/分,revolutions per minute)且近似于上述怠速RPM的值。
在上述燃料切断信号为开启(on)状态时,上述变速器的齿轮可以为接合状态。
上述控制器可以判断上述制动踏板信号是否从上述开启(on)状态转换到关闭(off)状态,在上述制动踏板信号转换到关闭(off)状态时,上述控制器解除上述ISG状态。
上述本发明实施例的包括ISG功能的车辆控制方法及其控制装置,因车辆减速而切断燃料(Fuel cut)之后,根据在变速器的齿轮接合的状态下踩踏制动踏板(brakepedal)后被激活(activation)的ISG进入信号,能够使车辆进入ISG状态。因此,即使因进入上述ISG状态而在发动机的怠速(idle)状态下禁止向发动机喷射燃料,也能够防止因禁止喷射燃料导致的发动机的摩擦扭矩(Friction torque)增加所引起驾驶员的减速感变差之类的车辆驾驶性劣化。
附图说明
为了进一步充分理解本发明的详细说明中所使用的附图,提供对各附图的简单说明。
图1为说明本发明实施例的包括ISG(怠速启停)功能的车辆控制方法的流程图(flowchart)。
图2为说明如图1所示的包括ISG功能的车辆控制方法的图。
图3为说明应用如图1所示的包括ISG功能的车辆控制方法的车辆的示例的框图(block diagram)。
附图标记说明
30:MHSG
200:控制器
205:发动机
具体实施方式
为了充分理解本发明和通过实施本发明而能够实现的目的,需要参照例示本发明实施例的附图和记载于附图的内容。
下面,参照附图对本发明实施例进行说明,由此来详细说明本发明。在说明本发明时,在判断为对相关公知结构或功能的具体说明会混淆本发明的要点的情况下,省略其详细说明。各附图中所标注的相同附图标记可以表示相同构成要素。
本说明书所使用的术语仅用于说明特定实施例,并不意图限定本发明。单数的表达包括复数的表达,除非从文脉上明确表示不同含义。本说明书中,“包括”或“具有”等术语,是指记载于说明书的特征、数字、步骤、动作、构成要素、部件或它们的组合存在,而不应理解为预先排除一个或一个以上的其它特征、数字、步骤、动作、构成要素、部件或它们的组合的存在或者附加可能性。
整个说明书中,记载某部分与其它部分“连接”时,这不仅包括“直接连接”的情况,还包括其间存在其它构成要素的状态下“电连接或机械连接”的情况。
包括技术术语和科学术语在内的这里所使用的术语,具有与本领域技术人员(普通技术人员)普遍理解的含义相同的含义,除非另行定义。如通常使用的词典所定义的术语,应当解释为与相关技术的文脉上具有的含义相一致的含义,而不应解释为理想的或过于形式的含义,除非本说明书中明确定义。
根据相关技术,在车辆减速时切断向发动机供给的燃料的燃料切断(Fuel cut)信号为关闭(off)状态时,仅通过踩踏制动踏板(brake pedal),车辆就能够进入ISG状态。因此,通过进入上述ISG状态,在发动机的怠速(idle)状态下,就禁止向发动机喷射燃料。其结果是,因为上述禁止喷射燃料所导致的发动机的摩擦扭矩(Friction torque)增加,可能引起驾驶员的减速感变差之类的车辆驾驶性劣化。
图1为说明本发明实施例的包括ISG(怠速启停)功能的车辆控制方法的流程图(flowchart)。图2为说明图示于图1的包括ISG功能的车辆控制方法的附图。图3为说明应用图示于图1的包括ISG功能的车辆控制方法的车辆的示例的框图(block diagram)。
参照图1至图3,在接收步骤(105)中,控制器(200)可以接收执行ISG功能所需的检测信号。上述ISG功能可以指如下功能:在上述车辆减速或停车时使发动机(205)的驱动停止而使发动机不燃烧,在车辆的起步时,再驱动发动机而使车辆能够移动。进而言之,ISG功能可以指如下功能:如果行驶中的车辆减速或停止,则禁止燃料喷射,自动停止发动机,在车辆从减速或停止状态再次出发的时刻(例如,驾驶员放开制动踏板并踩踏加速踏板的情况下),由起动发电机(30)自动地使发动机再起动。
上述检测信号可以包括:燃料切断(fuel cut off)信号,在上述车辆减速时成为开启(on)状态且在发动机(205)的基准转速时成为关闭(off)状态,指示(indication)是否切断向发动机(205)的燃料供给;齿轮接合信号,指示是否接合(engagement)上述车辆变速器(20)中所包括的齿轮(gear);和制动踏板信号,指示上述车辆的制动踏板操作与否。为了维持发动机的怠速RPM以及防止发动机熄火,发动机(205)的基准转速可以为大于发动机的怠速(idle)RPM(revolutions per minute)且近似于上述怠速RPM的值(例如1000rpm)。在上述燃料切断信号为开启(on)状态时,变速器(20)的齿轮可以为接合状态。
上述燃料切断信号可以是为了在车辆减速时改善车辆的燃料经济性、维持发动机(205)的怠速RPM以及防止发动机熄火而使用的信号。当车辆的加速踏板为关闭(off)状态且制动踏板为关闭(off)状态或制动踏板为开启(on)状态时,可以由控制器(200)生成上述燃料切断信号。当燃料切断信号为开启(on)状态时,发动机(205)的RPM可以为规定值(例如,1500rpm或2000rpm)以上。
上述发动机(205)的基准转速可以由车辆的RPM传感器(sensor)检测而提供至控制器(200)。上述齿轮接合信号可以由设置在车辆的感测齿轮接合的传感器(sensor)检测而提供至控制器(200)。上述制动踏板信号可以由车辆的制动踏板传感器(Brake pedalPosition Sensor,BPS)检测而提供至控制器(200)。上述加速踏板的状态可以通过由车辆的加速踏板传感器(acceleration pedal position sensor,APS)检测而提供至控制器(200)。
控制器(200)能够控制上述车辆的整体动作。控制器(200)例如可以是通过程序工作的一个以上的微处理器(microprocessor)(例如,ECU(发动机控制单元,Engine ControlUnit))或包含上述微处理器的硬件,上述程序可以包括用于执行本发明实施例的包括ISG功能的车辆控制方法的一系列指令(instruction)。上述指令可以存储在存储器(未图示)中。
上述车辆例如可以为中度混合动力(mild hybrid)车辆,包括发动机(205)、自动变速器(Automatic Transmission)或双离合器变速器(dual clutch transmission,DCT)之类的变速器(transmission)(20)、起动发电机(或MHSG(中度混合动力起动机和发电机,mild hybrid starter and generator))(30)、电池(40)、差速齿轮装置(differentialgear device)(50)、车轮(wheel)(60)和控制器(200)。除图3所示的中度混合动力车辆以外,本发明的实施例还能够应用于其它车辆。
包括上述ISG(怠速启停)功能的车辆的控制装置可以包括起动发电机(30)和控制器(200)。
发动机(205)能够使燃料在空气中燃烧从而将化学能转换成机械能。就中度混合动力车辆的动力传输而言,可以是发动机(205)的扭矩传递至变速器(20)的输入轴,从变速器(20)的输出轴输出的扭矩经由差速齿轮装置(50)传递至车桥。由上述车桥使车轮(60)旋转,从而能够通过发动机(205)的扭矩使上述中度混合动力车辆行驶。
起动发电机(30)能够将电能转换成机械能或者将机械能转换成电能。即,起动发电机(30)能够起动发动机(205)或者由发动机的输出来发电。另外,起动发电机(30)能够辅助发动机(205)的扭矩。上述中度混合动力车辆能够将发动机(205)的燃烧扭矩作为主动力并且将起动发电机(30)的扭矩用作辅助动力。发动机(205)和起动发电机(30)能够通过皮带(32)(或滑轮和皮带)连接。
起动发电机(30)可以是执行交流发电机、发动机扭矩辅助或再生制动的功能的部件。
起动发电机(30)能够在车辆的(或发动机的)启动(cranking)和扭矩控制模式中对车辆的发动机进行驱动(起动)控制,能够在车辆的发电模式中由发动机(205)的输出来发电从而对48V电池充电(40)。根据车辆的行驶状态,起动发电机(30)能够以如下的工作模式运行:发动机起动模式(mode);通过马达运转来辅助发动机(205)的扭矩的发动机扭矩辅助模式;能够对向车辆的电负载(电装负载)供给电力并通过LDC(低压DC-DC变换器,lowvoltage DC-DC converter)对与48(volt)电池连接的12(volt)电池充电的48(volt)电池充电的再生制动模式;或能够延长行驶距离的惯性行驶模式,起动发电机(30)能够根据上述车辆行驶状态被最优地控制,从而使车辆的燃料消耗降低效果极大化。
电池(40)能够向起动发电机(30)供电或者通过在再生制动模式中由起动发电机(30)回收的电来充电。电池(40)可以是48V电池。上述中度混合动力车辆还可以包括将由电池(40)供给的电压转换成低电压的LDC(低压DC-DC转换器,low voltage DC-DCconverter)和向使用低电压的电负载供给低电压的12V电池。
根据步骤(110),控制器(200)响应于上述检测信号,能够控制上述车辆使其进入ISG状态,该ISG状态为根据上述ISG功能切断向上述车辆的发动机(205)的燃料供给,并在上述车辆减速或停止时,使发动机(205)停止的状态。如图2所示,控制器(200)可以根据从开启(on)状态过渡到关闭(off)状态之前的上述燃料切断信号(F/cut)、开启(on)状态的齿轮接合信号和开启(on)状态的制动踏板信号,来生成ISG进入信号,并根据上述ISG进入信号使车辆进入ISG状态(state)。对应于上述ISG进入信号的发动机(205)的RPM大于发动机(205)的基准转速,例如可以为1050RPM。上述ISG进入信号可以是在不需要车辆加速的情况下切断发动机起动的信号。
图2中,发动机停止指令(Engine Stop Order)信号为上述ISG进入信号,如果发动机停止指令信号成为开启(on)状态,则可以禁止对发动机喷射燃料。从发动机停止指令信号成为开启(on)状态时刻起经过燃料切断基准时间后使燃料切断信号(F/cut)成为关闭(off)状态。如果发动机起动指令(Engine Start Order)信号成为开启(on)状态,则ISG状态解除并执行对发动机的燃料喷射,可以通过起动马达(或起动发电机(30))使发动机(205)再起动。在包括自动变速器或DCT(双离合变速器)的车辆中,可以在车辆减速时,将发动机的rpm维持在怠速RPM以上,为了在再减速时提高驾驶性而使档位下调(例如,5档、4档或3档)。因此,发动机(205)的rpm可以由此在减速过程伴随车辆的速度降低,并在换档时rpm再次上升。例如,自动变速器的变矩器的减震离合器(damper clutch)在3档时开放(open)。
在燃料切断信号(F/cut)为开启(on)状态且齿轮接合信号为开启(on)状态且制动踏板信号为开启(on)状态时,车辆可以滑行行驶(coasting drive)。在车辆滑行行驶之前指示车辆的加速踏板操作与否的加速踏板信号可以为关闭(off)状态。上述加速踏板信号可以通过由车辆的加速踏板传感器(acceleration pedal position sensor,APS)检测而提供至控制器(200)。
对应于上述发动机(205)的基准转速的车辆速度(燃料供给车速)例如可以为22kph。如果燃料供给车速下降,使变速器(20)工作的EOP(electric oil pump,电(电动)油泵)的工作区间可能会减小。例如,EOP在发动机转速变成低于600rpm时,开始工作,在发动机起动指令信号成为开启(on)状态后停止工作。在上述齿轮接合信号为关闭(off)状态时,包含于变速器(20)的齿轮可以是空档状态(Neutral state)。
根据判断步骤(115),控制器(200)能够判断上述制动踏板信号是否从上述开启(on)状态转换到关闭(off)状态。
根据解除步骤(120),在判断步骤(115)中上述制动踏板信号从开启(on)状态转换到关闭(off)状态时,控制器(200)能够解除(release)上述ISG状态(或控制成脱离ISG状态)。
在上述ISG状态解除(release)后,控制器(200)能够响应于加速踏板工作,驱动起动发电机(30)而起动(start)上述车辆的发动机(205)。
本发明实施例中所使用的构成要素或“~部(unit)”或块(block)或模块能够由在存储器上的规定区域执行的任务(task)、类(class)、子例程(subroutine)、进程(process)、对象(object)、执行线程(thread)、程序(program)之类的软件(software)或FPGA(现场可编程门阵列,field-programmable gate array)、ASIC(专用集成电路,application-specific integrated circuit)之类的硬件(hardware)实现,还能够由上述软件和硬件的组合构成。上述构成要素或“~部”等可以包括在能够由电脑读取的存储介质中,也可以分布为在多个电脑中分散有其一部分。
如上所述,附图和说明书公开了实施例。虽然本文使用了特定术语,但这些术语仅仅是为了说明本发明的目的而使用,它们并不用来限定含义或限制请求保护的范围所记载的本发明的范围。因此,本领域技术人员应当理解,能够根据本发明加以各种变形并且实现等同的实施例。因此,本发明真正的技术保护范围应依据请求保护的范围的技术思想而确定。
Claims (7)
1.一种包括怠速启停ISG功能的车辆控制方法,其特征在于,所述车辆控制方法包括以下步骤:
由控制器接收执行所述ISG功能所需的检测信号;以及
响应于所述检测信号,由所述控制器控制所述车辆使其进入ISG状态,其中在所述ISG状态中根据所述ISG功能切断向所述车辆的发动机的燃料供给并在所述车辆减速或停止时使所述发动机停止;
其中所述检测信号包括:燃料切断信号,齿轮接合信号和和制动踏板信号,
所述燃料切断信号,在所述车辆减速时成为开启on状态,在所述发动机成为基准RPM时成为关闭off状态,并且指示是否切断向所述发动机的燃料供给;所述齿轮接合信号,指示是否接合所述车辆中所包括的变速器的齿轮;所述制动踏板信号,指示所述车辆的制动踏板操作与否,
所述控制器配置为:在所述燃料切断信号从开启on状态过渡到关闭off状态之前以及当所述齿轮接合信号为开启on状态和制动踏板信号为开启on状态时,生成ISG进入信号,
所述控制器配置为:根据所述ISG进入信号使所述车辆进入所述ISG状态,以及
所述发动机的基准RPM大于所述发动机的怠速RPM。
2.如权利要求1所述的包括怠速启停ISG功能的车辆控制方法,其特征在于,其中,在所述燃料切断信号为开启on状态时,所述变速器的齿轮为接合状态。
3.如权利要求1所述的包括怠速启停ISG功能的车辆控制方法,其特征在于,还包括以下步骤:
由所述控制器判断所述制动踏板信号是否从开启on状态转换到关闭off状态,
其中,所述控制器配置为:在所述制动踏板信号转换到关闭off状态时,解除所述ISG状态。
4.如权利要求1所述的包括怠速启停ISG功能的车辆控制方法,其特征在于:所述变速器包括自动变速器。
5.一种包括怠速启停ISG功能的车辆的控制装置,其特征在于,包括:
起动发电机,配置为驱动所述车辆的发动机;和
控制器,配置为接收执行所述ISG功能所需的检测信号,
其中,所述控制器配置为:响应于所述检测信号,控制所述车辆使其进入ISG状态,其中在所述ISG状态中切断向所述车辆的发动机的燃料供给并在所述车辆减速或停止时使所述发动机停止,并且所述控制器配置为:在所述ISG状态解除时,使所述起动发电机工作,
所述检测信号包括:燃料切断信号、齿轮接合信号和制动踏板信号,
所述燃料切断信号在所述车辆减速时成为开启on状态,在所述发动机成为基准RPM时成为关闭off状态,并且指示是否切断向所述发动机的燃料供给;所述齿轮接合信号,指示是否接合所述车辆中所包括的变速器的齿轮;以及所述制动踏板信号,指示所述车辆的制动踏板操作与否,
所述控制器配置为:在所述燃料切断信号从开启on状态过渡到关闭off状态之前以及当所述齿轮接合信号为开启on状态和制动踏板信号为开启on状态时,生成ISG进入信号,
所述控制器配置为根据所述ISG进入信号使所述车辆进入所述ISG状态,以及
所述发动机的基准转速RPM大于所述发动机的怠速RPM且近似于所述怠速RPM的值。
6.如权利要求5所述的包括怠速启停ISG功能的车辆的控制装置,其特征在于:在所述燃料切断信号为开启on状态时,所述变速器的齿轮为接合状态。
7.如权利要求5所述的包括怠速启停ISG功能的车辆的控制装置,其特征在于:所述控制器配置为:判断所述制动踏板信号是否从开启on状态转换到关闭off状态,以及
所述控制器配置为:在所述制动踏板信号转换到关闭off状态时,解除所述ISG状态。
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