CN101466943A - 燃料喷射泵的低温时超前角机构 - Google Patents

燃料喷射泵的低温时超前角机构 Download PDF

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CN101466943A
CN101466943A CNA2007800216593A CN200780021659A CN101466943A CN 101466943 A CN101466943 A CN 101466943A CN A2007800216593 A CNA2007800216593 A CN A2007800216593A CN 200780021659 A CN200780021659 A CN 200780021659A CN 101466943 A CN101466943 A CN 101466943A
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injection pump
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田中雅道
町山博之
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Yanmar Power Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
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    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20Varying fuel delivery in quantity or timing
    • F02M59/24Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/38Pumps characterised by adaptations to special uses or conditions
    • F02M59/42Pumps characterised by adaptations to special uses or conditions for starting of engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46Valves
    • F02M59/466Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48Assembling; Disassembling; Replacing
    • F02M59/485Means for fixing delivery valve casing and barrel to each other or to pump casing
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    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
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    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/04Introducing corrections for particular operating conditions
    • F02D41/06Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/3082Control of electrical fuel pumps
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    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M2041/1438Arrangements or details pertaining to the devices classified in F02M41/14 and subgroups
    • F02M2041/1472Devices for limiting maximum delivery or for providing excess fuel for starting or for correcting advance at starting
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    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00Starting of engines by means of electric motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Abstract

一种燃料喷射泵(1),被配备在具有由键开关(61)起动的起动马达(63)的柴油机上,具有基于超前角用动作执行器(38)的低温时超前角机构(30)、上述起动马达(63)、及上述超前角动作执行器(38)。其中,具有每当键开关(61)接通时,使上述超前角用动作执行器(38)动作的故障确认机构。

Description

燃料喷射泵的低温时超前角机构
技术领域
[0001]本发明涉及在具有低温起动超前角机构的柴油机用的燃料喷射泵中用于提高低温起动超前角机构的动作的可靠性的技术。
背景技术
以往,作为通过在柱塞筒内使柱塞上下滑动,把被分配轴压送的燃料向多个输出阀送出,从各输出阀向燃料喷射喷嘴压送的机构的柴油机用的燃料喷射泵已被众所周知。
在此燃料喷射泵中,具有通过在上述柱塞筒上形成溢流用子端口(subport),由控制器使超前角用动作执行器动作,来进行上述溢流用子端口的开闭,由此使喷射时机变化的低温起动超前角机构(以下称为“CSD”(Cold Start Device))的燃料喷射泵已被众所周知。
而且,通过由此CSD在低温起动时进行通过关闭上述子端口使喷射时期提前的控制即超前角控制,使发动机的起动性提高了。溢流用子端口是用于使燃料压室与低压室(低压油路)连通的端口,该燃料压室与低压室的连通/断开是通过使夹设在两室之间的CSD活塞由超前角由动作执行器等动作来进行的。
[0003]但是,CSD,由于只在冬季等低温起动时动作,而在夏季不动作,所以成为燃料劣化的原因,存在CSD活塞相对于活塞筒的滑动面固结的危险。也就是说,在CSD不动作的期间长的情况下,产生损害该CSD活塞的动作的可靠性的问题。
因此,专利文献1是即使在低温时以外也通过操作人员的任意操作使CSD动作来提高CSD活塞的动作的可靠性的。
专利文献1:日本特开2004—316486号公报
发明内容
发明所要解决的课题
[0004]但是,为了提高燃料喷射泵的可靠性,在低温时以外,不仅希望使CSD动作,还希望进行故障确认。
另外,因为CSD的动作影响燃料喷射量,所以存在着由于任意地动作而对柴油机产生不良影响的情况。例如,在柴油机起动时,必要以上的燃料喷射量是黑烟恶化的原因。
因此,所要解决的课题是,不影响燃料喷射量地进行CSD的故障确认,提高燃料喷射泵的可靠性。
为了解决课题的手段
[0005]上面已经说明了本发明所要解决的课题,下面说明用于解决本课题的手段。
[0006]本发明是一种燃料喷射泵,所述燃料喷射泵被配备在具有由键开关起动的起动马达的柴油机上,具有基于超前角用动作执行器的低温时超前角机构,其中,每当键开关接通时都使上述超前角用动作执行器进行ON/OFF动作,同时,具有此ON/OFF动作的确认机构。
[0007]另外,本发明是这样一种燃料喷射泵:上述起动马达在接受来自控制器的起动信号后,在上述超前角用动作执行器的ON/OFF动作后起动。
发明的效果
[0008]作为本发明的效果是起到如下所示的效果。
[0009]在本发明中,由于每当起动马达起动时都使CSD动作,能够防止固结等故障,同时,通过进行CSD的故障检测,所以即使在CSD动作的低温时以外,也能够对CSD进行故障确认。也就是说,能够提高燃料喷射泵的可靠性。
[0010]另外,在本发明中,除了上述效果以外,还能够在起动马达驱动前使CSD动作,不会产生基于此CSD动作的燃料喷射量对柴油机的影响地进行故障确认。也就是说,能够提高故障确认时的燃料喷射泵的可靠性。
附图说明
[0011]图1是表示本发明的实施例的燃料喷射泵的全体的结构的侧面剖视图。
图2是表示CSD的ON/OFF动作的模式图。
图3是表示本发明的实施例的柴油机的控制装置的结构的方块图。
图4是表示柴油机起动时的各动作执行器的动作状态的坐标图。
符号说明:
[0012]
1:燃料喷射装置
30:低温时超前角机构(CSD)
38:超前角用动作执行器
61:键开关
63:起动马达
具体实施方式
[0013]下面,说明发明的实施方式。
图1是表示本发明的实施例的燃料喷射泵的全体的结构的侧面剖视图,图2是表示CSD的ON/OFF动作的模式图,图3是表示本发明的实施例的柴油机的控制装置的结构的方块图。
图4是表示柴油机起动时的各动作执行器的动作状态的坐标图。
[0014]在此,为了说明本发明的实施例,以在柴油机中使用的燃料喷射泵1、低温起动超前角机构(以下称为CSD30)的顺序进行说明。另外,为了在图1中简略地进行说明,将箭头的方向作为前后方向。
[0015]首先,用图1对本发明的燃料喷射泵1的结构进行说明。
如图1所示,燃料喷射泵1是如下地构成的:将泵壳体45和液压压头46的部分上下接合,在泵壳体45的部分的后侧面附设电子控制调节装置7的罩8,从罩8的左侧嵌插并固定齿条动作执行器40。
齿条动作执行器40是如下地构成的:将滑动轴3的前端部铰接在连杆23的中间部,将连杆23的下部配置成能够以基部销24为中心自由转动,在连杆23的上端部铰接着控制杆6的前端部。
依靠这样的结构,滑动轴3的前后方向的进退、以连杆23的基部销24为转动中心的前后方向的转动、控制杆6的前后方向的移动联动,由此,操作使柱塞32转动的调节齿条(未图示),通过调节齿条的驱动来变更与柱塞簧片之间的位置。这样,可以进行燃料喷射泵1的燃料喷射量的增量·减量的控制。
另外,在上述罩8的下部,安装了用于检测上述泵凸轮轴2的转速的转速传感器22。
[0016]在液压压头46上嵌插着柱塞筒33,在此柱塞筒33内可上下滑动地安装着柱塞32。
另外,通过在泵凸轮轴2上形成的凸轮4旋转,经挺杆11及下部弹簧座12,柱塞32能够上下移动,能够从柱塞筒33的主端口39向分配轴9供给压缩燃料。
再有,在液压压头46上的柱塞筒33的侧方,嵌插了低温起动超前角机构(以下称为“CSD30”)的活塞筒34,在活塞筒34的活塞滑动部34a内,可上下滑动地设置了CSD活塞35,使CSD活塞35能够由上述超前角用动作执行器38上下滑动。
[0017]下面,用图2详细地对CSD30进行说明。
CSD30被做成如下的结构:在超前角用动作执行器38的壳体38a内,配置了由励磁线圈53·53的通电进行上下运动的电枢55,电枢55的下端面和CSD活塞35的上端面经保持座56进行接触,并配置了与电枢55的上端面接触、向下方推压电枢55的弹簧51,在活塞筒34的活塞滑动部34a的下部,配置了向上方推压CSD活塞35的下端面的弹簧59。
在此,由上述弹簧51产生的推压力,被设定成比该弹簧59的推压力大。
[0018]在此,同样用图2对CSD30的ON/OFF动作进行说明
如图2所示,形成在柱塞筒33上的溢流用子端口36的一方,被做成能够与柱塞筒33内的燃料压送室连通,另一方则经液压压头46的***油路37、及活塞筒34的高压端口33b与活塞筒34内连通着。另外,在活塞筒34中,在上述高压端口33b的下方开口的低压端口33c与液压压头46的低压室47连通着。
在此,CSD活塞35的下部是由把活塞直径做成与活塞滑动部34a的内径大致相同的下部大径部35a构成的,以便当CSD30为ON即CSD30处于最上位置时(参照图2)封闭低压端口33c。
另一方面,CSD活塞35的上下大致中央部是由减小了活塞直径的中央小径部35b构成的,以便当CSD30为OFF即CSD30处于最下位置时(未图示)使高压端口33b和低压端口33c连通。
[0019]在这样的结构中,在上述超前角用动作执行器38动作时(CSD30为ON(图2)),电枢55反抗弹簧51的推压力而向上方移动。伴随电枢55的向上方移动,CSD活塞35依靠弹簧59的推压力向上方移动,经上述***油路37的溢流用子端口36和液压压头46的低压室47之间的连通被断开。这样,通过在柱塞32上升时停止来自溢流用子端口36的溢流,能够进行喷射时期的超前角控制。
另一方面,在超前角用动作执行器38非动作时(CSD30为OFF(未图示)),电枢55依靠由弹簧51产生的推压力(反抗弹簧59的推压力)向下方移动。伴随电枢55的向下方移动,CSD活塞35向下方移动,经***油路37的溢流用子端口36和低压室47连通。这样,通过使由柱塞32压缩的燃料的一部分向上述低压室47溢流,实现了通常时的喷射时期设定。
[0020]下面,用图3对含有本发明的燃料喷射泵1及柴油机的柴油机控制结构进行说明。
如图3所示,键开关61、CSD30的超前角用动作执行器38、使发动机起动的起动马达63的回路断续的起动马达继电器62是与控制器60连接着的。在此,所述的起动马达继电器是指使柴油机起动的起动马达63的回路断续的继电器,所述的键开关61是指由键进行柴油机的ON·OFF的开闭器。另外,转速传感器22及齿条动作执行器40等也与控制器60连接着,但在图3中,为了简单地进行说明而省略了。
通过做成这样的结构,控制器60由键开关61进行ON·OFF。再有,控制器60能够控制起动马达63及超前角用动作执行器38的ON·OFF的时机。
[0021]在此,用图4对作为本发明的实施例的CSD的故障检测控制进行说明。
图4是柴油机起动时的坐标图,横轴表示时间轴,纵轴表示图3所示的各动作执行器的动作。
首先,通过使键开关61处于ON状态,控制器60处于ON状态。接着,控制器60向起动马达继电器62输送驱动信号。此时,起动马达63在接受驱动信号后,在经过了牵制时间α后进行驱动。在此牵制时间α的期间,控制器60使超前角用动作执行器38进行ON·OFF,进行超前角用动作执行器38能否通电的故障诊断β。最后,通过把经过了牵制时间α的起动马达63处于ON状态,柴油机起动。
另外,故障诊断β的结果,在不能进行通电确认存在断线等的可能性的情况下,能够对操作者进行警告。至于警告的方法,一般是采用警告灯等,但在本实施例中未进行特别地限定。
[0022]CSD30是只在低温起动时动作的动作执行器,在低温时以外,难以进行故障检测。因此,如本实施例的那样,因为与发动机水温(寒暖)无关,每当柴油机起动时,都对CSD30进行故障检测,所以能够提高燃料喷射泵1的可靠性。
另外,CSD30是由ON和OFF改变燃料的喷射量的装置。在此,在为了检测故障而使CSD30与发动机起动同时地进行ON·OFF的情况下,将向柴油机供给必要以上的燃料喷射量,成为黑烟恶化的原因。因此,如本实施例的那样,因为在起动时对起动马达63设置牵制时间α,所以在可靠地停止起动马达63,即停止柴油机的期间,由于使CSD30进行ON·OFF,所以提高了故障检测时的安全性。
再有,在本实施例中,因为不仅是基于对超前角用动作执行器38的通电来进行故障检测的检测,而且因为超前角用动作执行器38实际上也进行ON·OFF,所以操作者也可以通过确认ON·OFF的切换声音进行超前角用动作执行器38的动作确认。这样,不仅依靠控制器60,而且依靠操作者的听觉也能够实施故障检测,因此提高了燃料喷射泵1的安全性。
产业上的利用可能性
[0023]本发明可以用在具有低温起动超前角机构的发动机上。

Claims (2)

1.一种燃料喷射泵,所述燃料喷射泵被配备在具有由键开关起动的起动马达的柴油机上,具有基于超前角用动作执行器的低温时超前角机构,
其特征在于,每当键开关接通时都使上述超前角用动作执行器进行ON/OFF动作,同时,具有此ON/OFF动作的确认机构。
2.一种燃料喷射泵,其特征在于,上述起动马达在接受来自控制器的起动信号后,在上述超前角用动作执行器的ON/OFF动作后起动。
CN2007800216593A 2006-05-09 2007-04-27 燃料喷射泵的低温时超前角机构 Expired - Fee Related CN101466943B (zh)

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