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    • 5. 发明授权
    • FUEL INJECTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    • 内燃机燃油喷射控制装置
    • EP2184482B1
    • 2012-03-14
    • EP08829232.1
    • 2008-09-08
    • Toyota Jidosha Kabushiki KaishaDENSO CORPORATION
    • OKUMURA, FumihiroNOMURA, Shigeo
    • F02M45/08F02M47/00F02M61/10
    • F02M45/086F02M47/027F02M61/12F02M61/182F02M63/0225F02M2200/46
    • At the communicating time of a fuel discharge passage (C3) by a control valve (48), fuel flows from an outer control chamber (R2o) via a communication passage (47) into an inner control chamber (R2i), and flows from the inner control chamber (R2i) to a fuel tank (T). As a result of the fuel flow in the communication passage (47), a differential pressure (Pco > Pci) is produced between an inner control pressure (Pci) and an outer control pressure (Pco). As a result, the outer differential pressure just after the outer valve was opened can be set at a small value thereby to suppress the increase of the unburned HC quantity in the exhaust gases at a low-load time, as caused by the high rising rate of an outer needle valve (42) just after the outer valve was opened. Moreover, the inner differential pressure just after the inner valve was opened can be set at a large value thereby to suppress the increase of the smoke quantity in the exhaust gases, as caused by the low rising rate of an inner needle valve (43) just after the inner valve was opened.
    • 燃料排出通路(C3)通过控制阀(48)连通时,燃料从外部控制室(R2o)经由连通通路(47)流入内部控制室(R2i),并从 内部控制室(R2i)连接到燃料箱(T)。 由于连通通道47中的燃料流动,在内部控制压力(Pci)和外部控制压力(Pco)之间产生压力差(Pco> Pci)。 其结果是,能够将外阀刚刚打开之后的外压差设定为较小的值,因此能够抑制高负荷时的废气中的未燃HC量的增加, 在外阀打开之后紧接着外针阀(42)。 另外,由于内阀(43)的上升速度小,所以能够将内阀打开后的内侧的差压设定得较大,能够抑制废气中的烟量增加 内阀打开后。
    • 9. 发明公开
    • FUEL INJECTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    • VORRICHTUNG ZUR KRAFTSTOFFINJEKTIONSSTEUERUNGFÜRVERBRENNUNGSMOTOREN
    • EP2184482A1
    • 2010-05-12
    • EP08829232.1
    • 2008-09-08
    • Toyota Jidosha Kabushiki KaishaDENSO CORPORATION
    • OKUMURA, FumihiroNOMURA, Shigeo
    • F02M45/08F02M47/00F02M61/10
    • F02M45/086F02M47/027F02M61/12F02M61/182F02M63/0225F02M2200/46
    • When a control valve 48 allows communication through a fuel drain channel C3, fuel flows into an inner control chamber R2i from an outer control chamber R2o through a communication channel 47 and flows out from the inner control chamber R2i to a fuel tank T. The flow of fuel through the communication channel 47 generates a differential pressure between inner control pressure Pci and outer control pressure Pco (Pco > Pci). Thus, an outer differential pressure immediately after an outer valve opening time can be set small, thereby restraining an increase in the unburnt HC content of exhaust gas at low load, which could otherwise result from a high rising speed of an outer needle valve 42 immediately after the outer valve opening time. Also, an inner differential pressure immediately after an inner valve opening time can be set large, thereby restraining an increase in the smoke content of exhaust gas, which could otherwise result from a low rising speed of an inner needle valve 43 immediately after the inner valve opening time.
    • 当控制阀48允许通过燃料排放通道C3进行连通时,燃料从外部控制室R2o通过连通通道47流入内部控制室R2i,并从内部控制室R2i流出到燃料箱T.流动 的燃料通过连通通道47产生内部控制压力Pci和外部控制压力Pco(Pco> Pci)之间的差压。 因此,可以将外部开阀时间之后的外部差压设定得较小,从而抑制在低负载下的排气的未燃HC含量的增加,否则可能由于外针阀42的上升速度而立即 后外阀打开时间。 此外,内部开阀时间之后的内部差压可以被设定得较大,从而抑制排气的烟雾含量的增加,否则,内部阀 营业时间。