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公开(公告)号：US06779344B2
公开(公告)日：2004-08-24
申请号：US10327241
申请日：2002-12-20
IPC分类号： F02D2300
CPC分类号： F02M69/14 , F02B37/18 , F02D23/02 , F02D41/0007 , F02D41/187 , F02D2041/0022 , Y02T10/144
摘要： A control system controls a turbo-charged trottled engine. The control system includes a throttle between the compressor and the engine, a wastegate communicated with exhaust upstream and downstream from the turbine, and a control unit for controlling the throttle and the wastegate. The control unit generates a desired air mass value per engine stroke as a function of a desired fuel flow amount and a stored compressor surge characteristic, generates a desired manifold air pressure value as a function of the desired air mass value and sensed engine parameters, and controls the throttle so that actual manifold air pressure matches the desired manifold air pressure. The control unit also generates a desired pressure boost value as a function of the desired manifold pressure value and a stored compressor surge characteristic, and controls the wastegate so that an actual boost pressure matches the desired boost pressure.
摘要翻译： 控制系统控制涡轮增压踩踏引擎。 控制系统包括压缩机和发动机之间的节气门，与涡轮机上游和下游的废气连通的废气门，以及用于控制节气门和废气门的控制单元。 控制单元根据期望的燃料流量和存储的压缩机喘振特性产生每个发动机冲程的期望空气质量值，并产生作为期望空气质量值和感测的发动机参数的函数的期望的歧管空气压力值，以及 控制节流阀，使得实际的歧管空气压力匹配所需的歧管空气压力。 控制单元还根据期望的歧管压力值和存储的压缩机喘振特性产生期望的压力升高值，并且控制废气门，使得实际的增压压力与期望的增压压力匹配。
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公开(公告)号：US06581571B2
公开(公告)日：2003-06-24
申请号：US09879641
申请日：2001-06-12
IPC分类号： F02P500
CPC分类号： F02P5/1502 , F02D41/146 , F02D2200/0418 , Y02T10/46
摘要： A system and method of controlling an engine includes sensing a concentration of NOx in exhaust gases produced by the engine and generating a sensed NOx value representative thereof, and controlling an engine control set point as a function of the sensed NOx value. The system also calculates a NOx difference value by subtracting a base NOx value from the sensed NOx value, and if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value. The method also includes sensing engine RPM, sensing engine manifold absolute pressure (MAP), determining the NOx value as a function of sensed engine RPM and MAP.
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3.发明授权Method and apparatus for controlling fuel/air mixture in a lean burn engine 失效用于控制稀燃燃烧发动机中的燃料/空气混合物的方法和装置
公开(公告)号：US5735245A
公开(公告)日：1998-04-07
申请号：US735105
申请日：1996-10-22
CPC分类号： F02D37/02 , F02D41/0007 , F02D41/04 , F02D41/2406 , F02P5/04 , F02D2200/0418 , Y02T10/144
摘要： The system for controlling the fuel/air mixture supplied to a lean burn engine when operating on natural gas, gasoline, hydrogen, alcohol, propane, butane, diesel or any other fuel as desired. As specific humidity of air supplied to the lean burn engine increases, the oxygen concentration of exhaust gas discharged by the engine for a given equivalence ratio will decrease. Closed loop fuel control systems typically attempt to maintain a constant exhaust gas oxygen concentration. Therefore, the decrease in the exhaust gas oxygen concentration resulting from increased specific humidity will often be improperly attributed to an excessive supply of fuel and the control system will incorrectly reduce the amount of fuel supplied to the engine. Also, the minimum fuel/air equivalence ratio for a lean burn engine to avoid misfiring will increase as specific humidity increases. A relative humidity sensor to allow the control system to provide a more enriched fuel/air mixture at high specific humidity levels. The level of specific humidity may be used to compensate an output signal from a universal exhaust gas oxygen sensor for changing oxygen concentrations at a desired equivalence ratio due to variation in specific humidity specific humidity. As a result, the control system will maintain the desired efficiency, low exhaust emissions and power level for the associated lean burn engine regardless of the specific humidity level of intake air supplied to the lean burn engine.
摘要翻译： 当根据需要对天然气，汽油，氢气，酒精，丙烷，丁烷，柴油或任何其他燃料进行操作时，控制供应给稀燃燃烧发动机的燃料/空气混合物的系统。 当供给到稀薄燃烧发动机的空气的比湿度增加时，由发动机以给定的当量比排出的废气的氧气浓度将降低。 闭环燃料控制系统通常试图维持恒定的废气氧浓度。 因此，由于特定湿度的增加导致的排气氧浓度的降低常常不正确地归因于燃料的过量供给，并且控制系统将不正确地减少供给发动机的燃料量。 此外，稀释燃烧发动机的最小燃料/空气当量比，以避免失火将随着特定湿度的增加而增加。 相对湿度传感器，允许控制系统在高比湿度水平下提供更多的富燃料/空气混合物。 可以使用比湿度的水平来补偿来自通用排气氧传感器的输出信号，用于由于特定湿度比湿度的变化而以期望的当量比改变氧气浓度。 结果，无论供应给稀燃发动机的进气的特定湿度水平如何，控制系统将保持所关联的稀薄燃烧发动机的期望效率，低废气排放和功率水平。
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