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    • 4. 发明公开
    • Cooling system for two-stage charged engines
    • Kühlsystemfürzweistufig geladene Motoren
    • EP2574753A1
    • 2013-04-03
    • EP11182936.2
    • 2011-09-27
    • Caterpillar Motoren GmbH & Co. KG
    • Schlemmer-Kelling, UdoRickert, CarstenRuschmeyer, Kai
    • F02B29/04
    • F01P7/165F01P2060/02F02B29/0412F02B29/0418F02B29/0443F02B29/0493Y02T10/146
    • For flexible cooling of intake air under a range of environmental conditions, a cooling system of a two-stage turbocharged internal combustion engine may comprise a high temperature (HT) cooling circuit (30) and a low temperature (LT) cooling circuit (50). HT cooling circuit (30) may comprise a first pump (32) for pumping a first coolant through the HT cooling circuit (30) and a pre-compressed intake air high temperature cooler (34) for cooling pre-compressed intake air generated by a first compressor (12) of a low pressure stage turbocharger. The LT cooling circuit (50) may comprise a second pump (52) for pumping a second coolant through the LT cooling circuit (50) and a compressed intake air low temperature cooler (54) for cooling compressed intake air generated by a second compressor (14) of a high pressure stage turbocharger by compressing the pre-compressed intake air. The HT cooling circuit (30) may further comprise a compressed intake air high temperature cooler (36) positioned upstream of the compressed intake air low temperature cooler (54). The cooling system may provide for a flexible cooling of the intake air for different environmental situations.
    • 为了在一定范围的环境条件下进气的柔性冷却,两级涡轮增压内燃机的冷却系统可以包括高温(HT)冷却回路(30)和低温(LT)冷却回路(50) 。 HT冷却回路(30)可以包括用于泵送通过HT冷却回路(30)的第一冷却剂的第一泵(32)和用于冷却预压缩进气的预压缩进气空气高温冷却器(34) 低压级涡轮增压器的第一压缩机(12)。 LT冷却回路(50)可以包括用于泵送通过LT冷却回路(50)的第二冷却剂的第二泵(52)和用于冷却由第二压缩机产生的压缩进气的压缩进气低温冷却器(54) 通过压缩预压缩的进气来实现高压级涡轮增压器。 HT冷却回路(30)还可以包括位于压缩进气低温冷却器(54)上游的压缩进气空气高温冷却器(36)。 冷却系统可以为不同的环境情况提供对进气的柔性冷却。
    • 6. 发明公开
    • Exhaust gas recirculation for large internal combustion engines
    • AbgasrückführungfürgroßeVerbrennungsmotoren
    • EP2647821A1
    • 2013-10-09
    • EP12163335.8
    • 2012-04-05
    • Caterpillar Motoren GmbH & Co. KG
    • Rickert, CarstenSchlemmer-Kelling, UdoSturm, Michael
    • F02M25/07
    • F02M26/47F02M26/05F02M26/24F02M26/28F02M26/33F02M26/34
    • An internal combustion engine may comprise an exhaust gas recirculation line (80, 82, 84, 86) with a high temperature cooler (50), an exhaust gas compressor (70), a low temperature cooler (55), and a control unit (60). The control unit (60) may be configured to control the cooling performance of the high temperature cooler (50) in accordance with a cooling performance/engine operation mode information such that a temperature of the extracted exhaust gas at an exit of the high temperature cooler (50) may be maintained at a temperature above a dew point of sulphuric acid independently of the engine operation mode. For low sulphur fuel operation of the engine, operating the high temperature cooler (50) in the proposed manner allows handling severe fouling and blocking issues primarily in the low temperature cooler (55).
    • 内燃机可包括具有高温冷却器(50)的排气再循环管线(80,82,84,86),排气压缩机(70),低温冷却器(55)和控制单元 60)。 控制单元(60)可以被配置为根据冷却性能/发动机操作模式信息来控制高温冷却器(50)的冷却性能,使得在高温冷却器的出口处提取的废气的温度 (50)可以独立于发动机操作模式保持在高于硫酸露点的温度。 对于发动机的低硫燃料操作,以所提出的方式操作高温冷却器(50)允许主要在低温冷却器(55)中处理严重的结垢和堵塞问题。