The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
This article describes the use of modern engine analysis techniques without having to attach special transducers to the engine under test.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
90% of the total text.
Page 1 of 1
Single Engine Flywheel Sensor
This article describes the use of modern engine analysis techniques without
having to attach special transducers to the engine under test.
Modern engine analysis algorithms that accurately calculate power and
compression use a transducer placed near the engine's flywheel. This
transducer senses flywheel teeth as they pass by. The time period between
adjacent teeth denotes the rotational velocity of the flywheel. The derivative of
this velocity is a measure of power when the engine is running and is a measure
of cylinder compression as the engine is rotating due to stored rotational energy.
Although these modern algorithms are accurate and conceptually simple,
they cannot in practice be applied to most automobiles. The chief reason for this
is the requirement for a flywheel sensor, which most cars do not have.
One solution to this problem can be found by looking at the engine's
alternator voltage. A connection is made directly across the alternator terminals
as shown in Fig. 1. Fig. 2 illustrates the alternator voltage and amplifier output.
The phase of this voltage changes in direct proportion to the change in velocity of
the flywheel. This is the same information gathered by flywheel sensors. From
these phase changes, it is possible to calculate engine power, compression and
dynamic load characteristics.
The existence of flywheel velocity data on the alternator voltage has been
demonstrated in the laboratory. Placement of a frequenc...