Engine operation without cam sensor

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

Reexamination Certificate

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Details

C701S111000, C701S113000, C123S021000, C073S116070

Reexamination Certificate

active

07069140

ABSTRACT:
Disclosed herein are methods of cranking and/or operating an engine that eliminates the need for use of a cam sensor. The methods implemented with internal combustion engine comprising a plurality of cylinders whose firing sequence occurs over two revolutions of a crankshaft with a first set of cylinders comprising a power stroke during the first crankshaft revolution and a second set of cylinders comprising the power stroke of a second crankshaft revolution. The methods involve manipulating fuel injection command signals to occur out of their proper sequence, monitoring and engine indicator responsive to firing and non-firing of cylinders, and identifying correct engine phase based on fluctuations in the engine indicator. Also disclosed herein are software product embodiments comprising program code modules that cause a engine control unit to manipulate the generation of fuel injection command signals to take place outside their correct sequence.

REFERENCES:
patent: 4907544 (1990-03-01), Burrahm
patent: 5191858 (1993-03-01), McWhorter
patent: 6212945 (2001-04-01), Moskwa
patent: 6571776 (2003-06-01), Dunsworth
patent: 6971338 (2005-12-01), Kobayashi et al.

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