Arrangement and method to measure cylinder pressure in a...

Details Arrangement and method to measure cylinder pressure in a... Arrangement and method to measure cylinder pressure in a...

2005-08-02

2005-08-02

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle drive train

Rear end

C073S035090, C073S035120, C073S117020

Reexamination Certificate

active

06923046

ABSTRACT:
The pressure in a cylinder of a combustion engine is determined on the basis of vibrations in the engine which are generated during movement of the piston. A vibration signal (S) from a vibration sensor situated on a cylinder is filtered in the region about the piston top dead center position, at the transition from compression to expansion, in a special filter in which a half Hanning filter acts upon the vibration signal before and an exponential filter acts upon the vibration signal after the piston top dead center position. The filtered signal (U) is thereafter converted to a pressure signal (P) on the basis of an established relationship between vibration and pressure. The half Hanning filter has a significantly shorter time window (TH) than the exponential filter (TE). The filter cleans the vibration signal in an advantageous manner and makes more reliable pressure determination possible.

REFERENCES:
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patent: 4584869 (1986-04-01), Frodsham
patent: 4640250 (1987-02-01), Hosaka et al.
patent: 4991553 (1991-02-01), Kurihara et al.
patent: 3029838 (1982-04-01), None
patent: 3506114 (1986-09-01), None
patent: 19742006 (1999-03-01), None
patent: 0671619 (1995-09-01), None
patent: 0922947 (1999-06-01), None

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