Stroke determination method of four cycle internal...

Details Stroke determination method of four cycle internal... Stroke determination method of four cycle internal...

2005-08-30

2005-08-30

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

06935168

ABSTRACT:
A section where a piston of a four cycle internal combustion engine makes one rotation from a position reaching a top dead point to a next top dead point is taken as a determination object section, and an output of a pressure sensor for detecting an intake air pressure of the internal combustion engine is sampled. A maximum value of an inclination of a change in the intake air pressure in the process of increasing an absolute value of the intake air pressure sampled in each determination object section is found and, when the maximum value of the inclination of the change in the intake air pressure found in each determination object section is larger than the maximum value of the inclination of the change in the intake air pressure found in the determination object section which is one section before each determination object section, each determination object section is determined to be a section where the intake stroke and the compression stroke are performed.

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