发明授权
US6021758A Method and apparatus for engine cylinder balancing using sensed engine
speed
失效
用于检测发动机转速的发动机气缸平衡的方法和装置
- 专利标题: Method and apparatus for engine cylinder balancing using sensed engine speed
- 专利标题(中): 用于检测发动机转速的发动机气缸平衡的方法和装置
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申请号: US979054申请日: 1997-11-26
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公开(公告)号: US6021758A公开(公告)日: 2000-02-08
- 发明人: David M. Carey , Taner Tuken
- 申请人: David M. Carey , Taner Tuken
- 申请人地址: IN Columbus
- 专利权人: Cummins Engine Company, Inc.
- 当前专利权人: Cummins Engine Company, Inc.
- 当前专利权人地址: IN Columbus
- 主分类号: F02D41/00
- IPC分类号: F02D41/00 ; F02D41/14 ; F02D41/34 ; G01M15/04 ; G01M15/11 ; F02M51/00
摘要:
Manufacturing/design imperfections and component failures in the fuel system/engine can lead to non-uniform torque production among the cylinders. Non-uniform cylinder torques can be observed as small engine speed fluctuations about the average engine speed at any given operating point. Severe imbalance conditions can be heard, felt, and seen by human operators. The present invention uses the fluctuations in engine speed to detect an unbalanced engine and attempts to correct the unbalance by applying trims to the fueling commands for each individual cylinder. The present invention is based on the calculation of a 6-point Fourier Transform (FFT) of engine speed data over one complete engine cycle. This FFT is calculated continuously to provide imbalance detection. An unbalanced engine results in non-zero magnitudes of the FFT components that correspond to the 0.5, 1.0, and 1.5 engine orders. The compensation scheme of the present invention uses iteration to drive the magnitudes of these components to zero if the engine is detected to be unbalanced.
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