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1.发明授权Method and means for determining air mass in a crankcase scavenged two-stroke engine 失效用于确定曲轴箱清扫二冲程发动机中的空气质量的方法和装置
公开(公告)号：US4920789A
公开(公告)日：1990-05-01
申请号：US409377
申请日：1989-09-19
CPC分类号： G01F1/86 , F02D41/18 , F02B2075/025 , F02D2400/04
摘要： A method and means are described for determining the mass of air available for combustion within a cylinder of a crankcase scavenged two-cycle engine, without the use of a mass-air flow sensor. This is achieved by estimating the mass of air under compression within a crankcase chamber, prior to its transfer to a cylinder combustion chamber during the engine operating cycle. The estimate for air mass is based upon the polytropic behavior of a portion of the crankcase compression process, and the pressure, volume and temperature of the air at two predetermined engine rotational positions during the polytropic phase of compression. The volume of the air within the crankcase chamber is determined as a function of engine rotational angle, with crankcase air temperature being derived as a function of intake air temperature. Air pressure during the polytropic phase of compression is sensed with a pressure sensor disposed within the crankcase chamber. The estimate for air mass is corrected to account for air leakage and imperfect transference of the air between the crankcase and combustion chambers.
摘要翻译： 描述了一种用于确定可用于在曲轴箱清扫的两冲程发动机的气缸内燃烧的空气的质量的方法和装置，而不使用质量 - 空气流量传感器。 这是通过在发动机运转循环期间将其转移到气缸燃烧室之前估计在曲轴箱室内的压缩空气质量来实现的。 空气质量的估计基于曲轴箱压缩过程的一部分的多变性行为，以及在压缩多相期间的两个预定的发动机转动位置处的空气的压力，体积和温度。 曲轴箱室内空气的体积被确定为发动机旋转角度的函数，曲轴箱空气温度作为进气温度的函数导出。 用设置在曲轴箱内的压力传感器检测压缩多相期间的空气压力。 对空气质量的估计被校正以考虑空气泄漏和曲轴箱和燃烧室之间的空气的不完全转移。
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2.发明授权Method and means for determining exhaust backpressure in a crankcase scavenged two-stoke engine 失效用于确定曲轴箱清扫的二冲程发动机中的排气背压的方法和装置
公开(公告)号：US5051909A
公开(公告)日：1991-09-24
申请号：US407984
申请日：1989-09-15
CPC分类号： F02D41/145 , F02D41/18 , G01F1/86
摘要： A method and means are described for determining the average backpressure at a cylinder exhaust port in a crankcase scavenged two-cycle engine. The exhaust backpressure is determined by averaging the pressure of air within a crankcase chamber associated with the cylinder, during a portion of the engine operating cycle when the cylinder inlet and exhaust ports are simultaneously open. The overlap interval in port openings creates a channel for airflow between the crankcase chamber and the cylinder exhaust port, and except for an initial portion of the interval assocated with the pressure equalization between the cylinder and its crankcase chamber, the crankcase pressure substantially equals the backpressure appearing at the cylinder exhaust port. In the preferred embodiment of the invention, a pressure sensor is disposed within the crankcase chamber to sample air pressure at specified engine rotational positions during the overlap interval. These samples are then numerically averaged to obtain the average exhaust backpressure, which is used for compensating the amount of air inducted per cylinder per engine cycle to determined the amount of air per cylinder trapped and available for combustion within the engine. The control of the engine is thereby automatically corrected to account for changes in the engine exhaust system, the altitude of engine operation, and local barometric pressure.
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3.发明授权Method and means for determining air mass in a crankcase scavenged two-stroke engine 失效用于确定曲轴箱清扫二冲程发动机中的空气质量的方法和装置
公开(公告)号：US4958516A
公开(公告)日：1990-09-25
申请号：US478124
申请日：1990-02-08
CPC分类号： G01F1/86 , F02D41/18 , F02B2075/025 , F02D2400/04
摘要： A method and apparatus are described for determining the mass of air available for combustion within a cylinder of a crankcase scavenged two-cycle engine, without the use of a mass-air flow sensor. This is achieved by estimating the mass of air under compression within a crankcase chamber, prior to its transfer to a cylinder combustion chamber. The estimate for air mass is based upon the integration of crankcase pressure over the interval of decreasing crankcase volume, while air within the crankcase is under compression. The volume of the air within the crankcase chamber is derived as a function of engine cycle position, with crankcase air temperature being derived as a function of intake air temperature. Air pressure during compression is monitored with a crankcase pressure sensor. The estimate for air mass is corrected to account for air leakage and incomplete transfer of the air between the crankcase and combustion chambers.
摘要翻译： 描述了一种用于确定可用于在曲轴箱清扫的两冲程发动机的气缸内燃烧的空气质量的方法和装置，而不使用质量空气流量传感器。 这是通过估计曲轴箱内压缩空气的质量在其转移到气缸燃烧室之前实现的。 空气质量的估计是基于曲轴箱压力在减小曲轴箱体积的间隔上的一体化，而曲轴箱内的空气处于压缩状态。 作为发动机循环位置的函数导出曲轴箱内空气的体积，其中曲轴箱空气温度作为进气温度的函数导出。 用曲轴箱压力传感器监测压缩期间的空气压力。 校正空气质量的估计以考虑空气泄漏和空气在曲轴箱和燃烧室之间的不完全传递。
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4.发明授权Method and means for determining air mass in a crankcase scavenged two-stroke engine 失效用于确定曲轴箱清扫二冲程发动机中的空气质量的方法和装置
公开(公告)号：US4920790A
公开(公告)日：1990-05-01
申请号：US377383
申请日：1989-07-10
CPC分类号： G01F1/86 , F02D41/18 , F02B2075/025 , F02D2400/04
摘要： A method and means are described for determining the mass of air available for combustion within a cylinder of a crankcase scavenged two-cycle engine, without the use of a mass-air flow sensor. This is achieved by estimating the mass of air under compression within a crancase chamber, prior to its transfer to the cylinder combustion chamber. The estimate for air mass is based upon the integration of crankcase pressure over the interval of decreasing crankcase volume, while air within the crankcase is under compression. The volume of the air within the crankcase chamber is derived as a function of engine cycle position, with crankcase air temperature being derived as a function of intake air temperature. Air pressure during compression is monitored with a crankcase pressure sensor. The estimate for air mass is corrected to account for air leakage and incomplete transfer of the air between the crankcase and combustion chambers.
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公开(公告)号：US5263358A
公开(公告)日：1993-11-23
申请号：US843037
申请日：1992-02-28
CPC分类号： F02D41/1474 , F02D41/1479
摘要： Oxygen sensor temperature and switching frequency compensation is provided to engine air-fuel ratio control, wherein the drift in the sensor voltage corresponding to stoichiometry is modeled and accounted for in the control, providing improved accuracy in conventional closed-loop engine air-fuel ratio control.
摘要翻译： 将氧传感器温度和开关频率补偿提供给发动机空燃比控制，其中在控制中对与化学计量相对应的传感器电压的漂移进行建模和考虑，提供常规闭环发动机空燃比控制中的改进的精度 。
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