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    • 31. 发明授权
    • Exhaust gas recirculation apparatus for an internal combustion engine
    • 用于内燃机的废气再循环装置
    • US08108129B2
    • 2012-01-31
    • US12445558
    • 2008-05-20
    • Shigeki NakayamaTomomi OnishiAkio Matsunaga
    • Shigeki NakayamaTomomi OnishiAkio Matsunaga
    • B60T7/12G05D1/00G06F7/00G06F17/00F02B47/08F02M25/07
    • F02D41/144F02B37/127F02D41/0007F02D41/0072F02M26/05F02M26/06F02M26/22F02M26/45Y02T10/144Y02T10/47
    • A technique is provided which, in an exhaust gas recirculation apparatus for an internal combustion engine, can calculate a low-pressure EGR rate and a high-pressure EGR rate in an accurate manner, and control the flow rates of both a low pressure EGR passage and a high pressure EGR passage in a closed-loop control manner, thereby to make the temperature of intake air and a supercharging pressure stable and to suppress the deterioration of exhaust emissions as well as the deterioration of power performance. The low pressure EGR rate, representative of the proportion of an amount of low pressure EGR gas to an amount of intake air sucked into the internal combustion engine, and the high pressure EGR rate, representative of the proportion of an amount of high pressure EGR gas to the amount of intake air, are calculated by using a CO2 concentration in an intake passage at a location downstream of a connection portion of the low pressure EGR passage and upstream of a connection portion of the high pressure EGR passage, a CO2 concentration in the intake passage at a location downstream the connection portion of the high pressure EGR passage, and a CO2 concentration of an exhaust gas discharged from the internal combustion engine (S103). The low pressure EGR rate and the high pressure EGR rate to be calculated are controlled to individual target values, respectively (S104).
    • 提供了一种在内燃机的排气再循环装置中能够以精确的方式计算低压EGR率和高压EGR率的技术,并且控制低压EGR通路 和高压EGR通路,从而使进气温度和增压压力稳定,并且抑制废气排放的劣化以及功率性能的劣化。 代表低压EGR气体的量与吸入内燃机的进气量的比例的低压EGR率和表示高压EGR气体的比例的高压EGR率 通过在低压EGR通路的连接部分的下游位置和高压EGR通路的连接部分的上游的位置处的进气通道中使用CO 2浓度来计算进气量, 在高压EGR通路的连接部分下游的位置和从内燃机排出的废气的CO 2浓度的进气通道(S103)。 将要计算的低压EGR率和高压EGR率分别控制到各个目标值(S104)。