Method for estimating the crank angle at which 50% of the...

Details Method for estimating the crank angle at which 50% of the... Method for estimating the crank angle at which 50% of the...

2008-07-23

2010-11-09

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Relative rotational position

Reexamination Certificate

active

07827857

ABSTRACT:
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 nthtorque harmonic; and determining the combustion index by applying the algebraic function to the nthtorque harmonic.

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EPO, Extended EP Search Report for EP 09 16 8056, mailed Nov. 19, 2009, all pages.
EPO, EP Search Report for EP 07425457.4, mailed on Apr. 3, 2008, all pages.

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