CN102016278B - 共轨系统的叠加的压力调节 - Google Patents
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- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
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- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/406—Electrically controlling a diesel injection pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/023—Means for varying pressure in common rails
- F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
- F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/0275—Arrangement of common rails
- F02M63/028—Returnless common rail system
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- 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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
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Abstract
提出用于调节内燃机共轨喷射设备的压力的方法和装置。在该方法中通常执行体积流控制阀调节模式。在执行体积流控制阀调节模式期间在需要时激活并暂时地执行压力控制阀调节模式,以便通过这种方式尤其是在动态过程中实现改善的压力调节特性。
Description
技术领域
本发明涉及一种用于调节内燃机共轨喷射设备的压力的方法,该共轨喷射设备具有:高压泵,其用于将燃料输入到共轨燃料储存器中,并与喷射器连接;设置在高压泵上游的体积流控制阀,利用该体积流控制阀可调节流入到高压泵中的燃料体积流;和在高压泵下游的压力控制阀,其中根据相应的工作点通过体积流控制阀调节模式(VCV,闭环控制模式)或压力控制阀调节模式(PCV,闭环控制模式)进行压力调节。
本发明还涉及一种用于实施这种方法的装置。
背景技术
为了将燃料喷入到内燃机特别是柴油内燃机的燃烧室中,使用喷射设备,这种喷射设备近年来始终都被设计成所谓的“共轨”设备。就共轨设备而言,从共同的燃料储存器即共轨给设置在燃烧室中的喷射器供应燃料。要喷入的燃料此时在燃料储存器中处于高达2000bar的压力下。
针对内燃机的这种喷射设备的为了将燃料喷入到内燃机燃烧室中所需要的喷射压力的精度,提出了越来越高的要求。因此,用于调节压力的相应的方法越来越重要。
由DE 10 2006 018 164 B3已知一种开头部分所述的用于调节共轨喷射设备的压力的方法。在这种已知的方法中,利用设置在高压泵上游的体积流控制阀来调节流入到高压泵中的燃料体积流。通过设置在高压泵下游的压力控制阀进行压力控制。始终都只有一种调节模式,即要么是体积流控制阀调节模式(VCV闭环控制模式),要么是压力控制阀调节模式(PCV闭环控制模式)。
在根据相应的工作点通过体积流控制阀调节模式(VCV闭环控制模式)进行压力调节时,在暂态阶段例如在滑移运行情况下或者在给定值梯度(Gradient)为负情况下,必须始终都要考虑较大的过调量,因为体积流控制阀或高压泵惯性很大。不言而喻,这对压力调节特性不利。
发明内容
本发明的目的在于,提出开头部分所述的方法,采用这种方法尤其是在动态过程中可实现特别良好的压力调节特性。
根据本发明,在所述方法中采取如下措施来实现所述目的,即在执行体积流控制阀调节模式(VCV闭环控制模式)期间在需要时激活并暂时地执行压力控制阀调节模式(PCV闭环控制模式)。
因此在本发明的方法中,在体积流控制阀调节模式下暂时地执行压力控制阀调节。这种执行并不会使得压力调节系统不稳定,然而在需要情况下,特别是在暂态阶段,会使得压力非常迅速地下降到给定值,这是因为压力控制阀调节具有明显高于体积流控制阀调节的动态特性。由此可以采用本发明的方法在动态过程中实现特别好的压力调节特性。
力求尽可能始终都通过体积流控制阀调节模式来调节压力。这使得液压系统具有较高的能源效率。根据本发明,在这种体积流控制阀调节模式期间,在需要时激活并暂时地执行压力控制阀调节。
在体积流控制阀调节模式下暂时地执行压力控制阀调节并不会使得压力调节系统不稳定。
在本发明的改进中,在体积流控制阀调节模式(VCV闭环控制模式)期间通常将压力控制阀调节模式(PCV闭环控制模式)去激活,且仅作为偏差控制(PCV偏差)来运行。因此压力控制阀调节在体积流控制阀调节模式下只是受控地工作。根据该实施方式,在体积流控制阀调节模式(VCV闭环控制模式)期间在需要时从偏差控制(PCV偏差)切换到压力控制阀调节模式(PCV闭环控制模式)。
本发明还涉及一种用于实施前述方法的装置。该装置具有压力调节单元,该压力调节单元在体积流控制阀调节模式(VCV闭环控制模式)期间在需要时激活并暂时地执行压力控制阀调节模式(PCV闭环控制模式)。
优选压力调节单元在体积流控制阀调节模式期间通常将压力控制阀调节模式去激活,并仅作为偏差控制(PCV偏差)来运行。在需要时,压力调节单元在体积流控制阀调节模式期间从偏差控制(PCV偏差)切换到压力控制阀调节模式,反之亦然。
优选压力调节单元具有共轨压力协调部件,该共轨压力协调部件根据工作点来选择体积流控制阀调节模式或压力控制阀调节模式。压力调节单元还优选具有压力控制阀协调部件,该压力控制阀协调部件从偏差控制(PCV偏差)切换到压力控制阀调节模式,反之亦然。为此,压力调节单元最好具有带有斜坡或指数过渡特性的开关器。
附图说明
下面借助实施例结合附图详细介绍本发明。图中示出:
图1为共轨喷射设备的示意图;
图2为压力调节单元的一部分的方块图;和
图3为压力调节单元的另一部分的方块图。
具体实施方式
图1中示意性地示出的喷射设备具有燃料罐7,前置管路11从该燃料罐经由过滤器8伸展至前置输送泵9,该前置输送泵进行燃料输送。与前置输送泵9平行地连接有前置压力调节阀10。前置管路11于是通过体积流控制阀2,利用该体积流控制阀可调节在设置于其下游的高压泵3中的燃料体积流。高压泵3将燃料输入到共轨储存器5中,该共轨储存器与各种不同的喷射器6连接。
在燃料返回管路13中,在高压泵3的上游设置有压力控制阀4。返回的燃料通过返回管路13经由过滤器12返回到燃料罐7中。
为了调节该共轨喷射设备的压力,使用一种未示出的压力调节单元,该压力调节单元根据工作点,要么执行体积流控制阀调节模式,在这种模式下相应地调节体积流控制阀2,要么执行压力控制阀调节模式,在这种模式下调节压力控制阀4。为此,压力调节单元具有共轨压力调节协调部件20,该共轨压力调节协调部件根据工作点来决定激活哪一种调节模式。压力控制阀调节用21表示,而体积流控制阀调节用22表示。
压力调节单元力求始终都通过体积流控制阀调节22来调节喷射设备的压力。在该模式下,压力控制阀调节只在控制模式下工作,也就是说,压力控制阀调节在此是一种偏差控制。
图3示出,压力调节单元具有压力控制阀协调部件30,该压力控制阀协调部件在需要时从偏差控制(PCV偏差)31切换到压力控制阀调节模式32,反之亦然。在压力控制阀调节模式32被去激活时,压力控制阀调节就是一种偏差控制31,这种偏差控制由PCV_PCTL(压力控制阀预先控制33)、PCV_AD(压力控制阀适配34)和PCV_偏差组成。
通过具有斜坡或指数过渡特性的开关器35进行从偏差控制31到压力控制阀调节模式32的相应的切换。
Claims (5)
1.一种用于调节内燃机共轨喷射设备的压力的方法,该共轨喷射设备带有压力调节系统,该压力调节系统具有:高压泵,其用于将燃料输入到与喷射器连接的共轨燃料储存器中;设置在高压泵上游的体积流控制阀,利用该体积流控制阀可调节流入到高压泵中的燃料体积流;在高压泵下游的压力控制阀;和压力调节单元,其中根据内燃机的相应的工作点通过体积流控制阀调节模式或压力控制阀调节模式进行压力调节,其特征在于,利用该压力调节单元在体积流控制阀调节模式期间通常将压力控制阀调节模式去激活,且仅作为偏差控制来运行,且仅在压力调节系统的暂态阶段激活并暂时地执行压力控制阀调节模式,以便使得压力迅速地下降到给定值。
2.一种用于实施根据权利要求1的方法的用来调节内燃机共轨喷射设备的压力的装置,该共轨喷射设备带有压力调节系统,该压力调节系统具有:高压泵,其用于将燃料输入到与喷射器连接的共轨燃料储存器中;设置在高压泵上游的体积流控制阀,该体积流控制阀可调节流入到高压泵中的燃料体积流;在高压泵下游的压力控制阀,所述装置具有压力调节单元,该压力调节单元被设计用于根据内燃机的相应的工作点通过体积流控制阀调节模式或压力控制阀调节模式进行压力调节,其特征在于,该压力调节单元还被设计用于在体积流控制阀调节模式期间将压力控制阀调节模式去激活,且使其仅作为偏差控制来运行,且仅在压力调节系统的暂态阶段将其激活并暂时地执行压力控制阀调节模式,以便使得压力迅速地下降到给定值。
3.如权利要求2所述的装置,其特征在于,压力调节单元具有共轨压力协调部件(20),该共轨压力协调部件根据工作点来选择体积流控制阀调节模式(22)或压力控制阀调节模式(21)。
4.如权利要求2或3所述的装置,其特征在于,压力调节单元具有压力控制阀协调部件(30),该压力控制阀协调部件从偏差控制(31)切换到压力控制阀调节模式(32),反之亦然。
5.如权利要求4所述的装置,其特征在于,压力控制阀协调部件(30)具有带有斜坡或指数过渡特性的开关器(35)。
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DE102008021384A DE102008021384B3 (de) | 2008-04-29 | 2008-04-29 | Überlagerte Druckregelung des Common-Rail-Systems |
DE102008021384.5 | 2008-04-29 | ||
PCT/EP2009/053357 WO2009132898A1 (de) | 2008-04-29 | 2009-03-23 | Überlagerte druckregelung des common-rail-systems |
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- 2009-03-23 US US12/989,477 patent/US8528522B2/en active Active
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Also Published As
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US8528522B2 (en) | 2013-09-10 |
DE102008021384B3 (de) | 2009-11-26 |
CN102016278A (zh) | 2011-04-13 |
WO2009132898A1 (de) | 2009-11-05 |
US20110041808A1 (en) | 2011-02-24 |
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