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    • 36. 发明授权
    • Method and system for estimating cylinder air charge for an internal combustion engine
    • 用于估计内燃机的气缸充气的方法和系统
    • US06748313B2
    • 2004-06-08
    • US10065538
    • 2002-10-28
    • Yonghua LiJohn Ottavio Michelini
    • Yonghua LiJohn Ottavio Michelini
    • F02D4118
    • F02D41/18F02D2200/0402F02D2200/0406
    • A method is provided for estimating cylinder air charge in an internal combustion engine, such engine having a mass airflow (MAF) sensor and a manifold absolute pressure(MAP) sensor. The method provides such cylinder air charge estimation from signals produced primarily by the manifold absolute pressure sensor during engine transient conditions. During a transition period between the transient condition and a steady-state engine condition the method combines signals primarily from both the mass airflow sensor and the manifold absolute pressure sensor to provide such cylinder air charge estimation. During the steady-state condition, the method uses primarily only the mass airflow sensor to provide such cylinder air charge estimation. With such method, the cylinder air charge estimation method utilizes the advantages of both measurement sensors. When transient situation occurs, the engine controller utilizes measurements from MAP sensors (together with measurements from other less significant sensors) to produce the cylinder air charge estimation. When it is determined that the transient situation is converging to a steady state operation, a smoothing algorithm is employed to combine the measurements from both MAF and MAP sensors to produce the cylinder air charge estimation. Finally, when the engine is operating in steady state, only the MAF sensor (together with other less significant sensors) is used to produce the cylinder air charge estimation.
    • 提供了一种用于估计内燃机中的气缸空气的方法,该内燃机具有质量气流(MAF)传感器和歧管绝对压力(MAP)传感器。 该方法提供了在发动机瞬态条件下主要由歧管绝对压力传感器产生的信号的气缸气压估计。 在瞬态条件和稳态发动机条件之间的过渡期间,该方法主要组合来自质量气流传感器和歧管绝对压力传感器的信号,以提供这种气缸充气估计。 在稳态条件下,该方法主要仅使用质量气流传感器来提供这种气缸空气电荷估计。 利用这种方法,气缸空气电荷估计方法利用两个测量传感器的优点。 当发生瞬态情况时,发动机控制器利用MAP传感器的测量结果(以及其他较不重要的传感器的测量值)来产生气缸空气电荷估计。 当确定瞬态情况正在收敛到稳态运行时,采用平滑算法来组合来自MAF和MAP传感器的测量结果,以产生气缸空气电荷估计。 最后,当发动机处于稳定状态时,仅使用MAF传感器(连同其他较不重要的传感器)来产生气缸空气充量估算。