发明名称 |
METHOD FOR ESTIMATING THE CRANK ANGLE AT WHICH 50% OF THE FUEL MASS HAS BEEN BURNT IN A CYLINDER OF AN INTERNAL COMBUSTION ENGINE WITH SPONTANEOUS MIXTURE IGNITION |
摘要 |
An estimation method of the crank angle at which 50% of the fuel mass has been burnt in a cylinder of an internal combustion engine with spontaneous ignition of the mixture provided with a drive shaft coupled to a phonic wheel presenting a number N of teeth; the method contemplates the steps of: reading the passage of each tooth of the phonic wheel in front of a sensor; determining the angular speed of the drive shaft at each tooth event of the phonic wheel; determining at least one harmonic of the speed signal; determining an inverse mechanical model of the transmission; determining at least one torque harmonic by applying the inverse mechanical model to the speed signal harmonic; determining an algebraic function which puts a combustion index into relation with the phase of the nth torque harmonic; and determining the combustion index by applying the algebraic function to the nth torque harmonic.
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申请公布号 |
US2009095060(A1) |
申请公布日期 |
2009.04.16 |
申请号 |
US20080177922 |
申请日期 |
2008.07.23 |
申请人 |
MAGNETI MARELLI POWERTRAIN S.P.A. |
发明人 |
SERRA GABRIELE;LUPO SAVINO LUIGI |
分类号 |
G01M15/04;G01P3/00 |
主分类号 |
G01M15/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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