Flywheel Data Card for Personal Computer System-Based Automotive Engine Analyzer
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Landry, JA: AUTHOR [+5]
This article describes a circuit arrangement in an attachment card for a personal computer (PC) which analyzes data obtained from an automotive engine flywheel.
Flywheel Data Card for Personal Computer System-Based
describes a circuit arrangement in an
attachment card for a personal computer (PC) which analyzes data
obtained from an automotive engine flywheel.
under test is attached to automotive circuitry which
includes sensors and circuits to digitize the analog signals from the
sensors. The outputs of the circuits go to a PC attachment card, the
flywheel data card (FDC) on which the circuit arrangement of this
disclosure is included. The FDC will take the data from the engine
and send it to the PC which will run diagnostic and analysis routines
to measure engine performance.
disclosed herein is shown in the figure. It
measures the square wave period of signal ZK0. This signal is
created by placing a transducer close to the teeth of the automobile
flywheel. As the teeth pass the transducer, they create one pulse
per tooth. The leading edge of each pulse corresponds to the leading
edge of the corresponding tooth as it passes the transducer.
80C452 microprocessor measures the time between the
leading edge of adjacent teeth over a period of one engine cycle.
The signal OT (known as top dead center) occurs at the beginning and
middle of the engine cycle. The signal CYL1 (known as cylinder 1)
occurs only at the start of the engine cycle. The microprocessor
uses these two signals to start measurements of ZK0. ...