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    • 2. 发明授权
    • Individual cylinder fuel control method
    • 独立气缸燃油控制方法
    • US06314952B1
    • 2001-11-13
    • US09535006
    • 2000-03-23
    • Raymond Claude TurinSanjeev Manubhai Naik
    • Raymond Claude TurinSanjeev Manubhai Naik
    • F02D4114
    • F02D41/0085F02D41/1401F02D2041/1409F02D2041/1415F02D2041/1416F02D2041/1417F02D2041/1426F02D2041/1433
    • An improved individual cylinder fuel control method based on sampled readings of a single oxygen sensor responsive to the combined exhaust gas flow of several engine cylinders. A model-based observer is used to reproduce the imbalances of the different cylinders and a proportional-plus-integral controller is used for their elimination. Both the observer and the controller are formulated in terms of a periodic system. The observer input signal is preprocessed such that it reflects at each point of time the deviation from the current A/F-ratio mean value calculated over two engine cycles. Therefore, transient engine operating conditions do not harm the reconstruction of the cylinder imbalances dramatically. The control algorithm features process/controller synchronization based on table lookup and a mechanism to automatically adjust the mapping between the observer estimates and the corresponding cylinders if unstable control operation is detected.
    • 基于对几个发动机气缸的组合排气流响应的单个氧传感器的采样读数的改进的单缸燃料控制方法。 使用基于模型的观察器来再现不同气缸的不平衡,并且使用比例加积分控制器进行消除。 观察者和控制者都是按照周期系统制定的。 观察者输入信号被预处理,使得其在每个时间点反映与在两个发动机循环中计算的当前A / F比平均值的偏差。 因此,瞬态发动机的运行条件不会严重影响汽缸失重的重建。 控制算法具有基于表查找的过程/控制器同步,以及如果检测到不稳定控制操作,则自动调整观测器估计与对应气缸之间的映射的机制。
    • 7. 发明授权
    • Air-fuel ratio control system for internal combustion engines
    • 内燃机空燃比控制系统
    • US5852930A
    • 1998-12-29
    • US833091
    • 1997-04-04
    • Yuji YasuiShusuke AkazakiKohei Hanada
    • Yuji YasuiShusuke AkazakiKohei Hanada
    • F02D41/14F01N3/00
    • F02D41/1473F02D41/1403F02D41/1441F02D2041/1409F02D2041/1415F02D2041/1416F02D2041/1418F02D2041/142F02D2041/1426F02D2041/1431F02D2041/1433F02D41/1402F02D41/1456
    • An air-fuel control system for use with an internal combustion engine has a catalytic converter disposed in an exhaust system of the engine, for purifying an exhaust gas emitted from the engine, a first exhaust gas sensor disposed in the exhaust system for detecting an air-fuel ratio of the exhaust gas upstream of the catalytic converter, a second exhaust gas sensor disposed in the exhaust system for detecting the concentration of a component of the exhaust gas which has passed through the catalytic converter, downstream of the catalytic converter, and a control unit for controlling an air-fuel ratio of the engine based on outputs from the first exhaust gas sensor and the second exhaust gas sensor. The control unit includes an adaptive sliding mode controller for determining a correction quantity to correct the air-fuel ratio of the engine so as to equalize the concentration of the component of the exhaust gas downstream of the catalytic converter to a predetermined appropriate value, according to an adaptive sliding mode control process based on the output from the second exhaust gas sensor, and a feedback controller for controlling a rate at which fuel is supplied to the engine so as to converge the concentration of the component of the exhaust gas downstream of the catalytic converter toward the predetermined appropriate value, based on the correction quantity and the output from the first exhaust gas sensor.
    • 一种与内燃机一起使用的空气燃料控制系统,具有设置在发动机的排气系统中的用于净化从发动机排出的排气的催化转化器,设置在排气系统中的第一排气传感器,用于检测空气 - 催化转化器上游排气的燃料比,设置在排气系统中的第二废气传感器,用于检测通过催化转化器的排气的成分浓度,催化转化器的下游,以及 控制单元,用于基于来自第一排气传感器和第二排气传感器的输出来控制发动机的空燃比。 控制单元包括自适应滑动模式控制器,用于确定校正量以校正发动机的空燃比,以便将催化转化器下游的排气的分量的浓度相等到预定的适当值,根据 基于来自第二废气传感器的输出的自适应滑动模式控制过程和用于控制向发动机供应燃料的速率的反馈控制器,以使催化剂下游的排气的组分的浓度 转换器基于校正量和来自第一废气传感器的输出而朝向预定的适当值。
    • 10. 发明授权
    • Air-fuel ratio control system for internal combustion engine
    • 内燃机空燃比控制系统
    • US5755212A
    • 1998-05-26
    • US723143
    • 1996-09-30
    • Takumi Ajima
    • Takumi Ajima
    • F02D45/00F02D41/14G05B13/02F02D41/00
    • F02D41/1458F02D41/1405F02D2041/1409F02D2041/1415F02D2041/1426F02D2041/1431F02D2041/1433F02D2200/0402
    • An air-fuel ratio control system with a high accuracy for an internal combustion engine which is capable of particularly improving the transient response characteristic irrespective of the occurrence of an air-fuel ratio sensor delay and a fuel attachment. An in-cylinder air-fuel ratio is calculated on the basis of engine data obtained in advance so that an neural network (NN) receiving a fuel injection quantity involving the past value and air quantity estimating information such as an intake pressure and outputting a calculated in-cylinder air-fuel ratio undergoes learning. In the actual control, a difference between the in-cylinder air-fuel ratio estimated in the NN and the target air-fuel ratio is taken on the basis of information such as a fuel injection quantity varying with the time and the output of the NN is partially differentiated with respect to the fuel injection quantity, so that the difference therebetween is divided by the resultant partial differential coefficient to obtain a fuel correction amount whereby the in-cylinder air-fuel ratio coincides with the target air-fuel ratio. The fuel injection quantity is corrected with this correction amount to calculate a final fuel injection quantity. That is, the in-cylinder air-fuel ratio is controlled to approach the target air-fuel ratio so that the exhaust gas air-fuel ratio equals the target air-fuel ratio.
    • 一种用于内燃机的具有高精度的空燃比控制系统,其能够特别地改善瞬态响应特性,而与空燃比传感器延迟和燃料附着的发生无关。 基于预先获得的发动机数据来计算缸内空燃比,使得接收到过去值的燃料喷射量的神经网络(NN)和诸如进气压力的空气量估计信息,并输出计算出的 缸内空燃比经过学习。 在实际控制中,基于NN估计的缸内空燃比与目标空燃比之间的差异是基于随着时间和NN的输出而变化的燃料喷射量的信息 相对于燃料喷射量被部分地区分,从而将其之间的差除以所得到的偏微分系数,以获得燃料校正量,从而缸内空燃比与目标空燃比一致。 以该校正量校正燃料喷射量,以计算最终燃料喷射量。 也就是说,将缸内空燃比控制为接近目标空燃比,使得排气空燃比等于目标空燃比。