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Method for Ignition Breaker Points Capacitor Testing, and Servicing Decisions

IP.com Disclosure Number: IPCOM000074223D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Levitre, EJ: AUTHOR [+5]

Abstract

This method is for diagnosis of the breaker points and capacitor of an internal combustion engine with conventional ignition without disassembly of the component parts. The method can be implemented with a computer controlled automobile diagnostic system. Special apparatus used contains detectors to detect breaker points opening, breaker points closing, and when voltage across points first exceeds a set value after opening. Additional circuits in the system measure the time elapsed between detected events, and measure voltage drop across the breaker points.

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Method for Ignition Breaker Points Capacitor Testing, and Servicing Decisions

This method is for diagnosis of the breaker points and capacitor of an internal combustion engine with conventional ignition without disassembly of the component parts. The method can be implemented with a computer controlled automobile diagnostic system. Special apparatus used contains detectors to detect breaker points opening, breaker points closing, and when voltage across points first exceeds a set value after opening. Additional circuits in the system measure the time elapsed between detected events, and measure voltage drop across the breaker points.

Testing of the breaker points and capacitor is based on measurements, which are 1) the voltage drop across the closed points, 2) the time from points opening to when the voltage across the points exceeds a set value, and 3) the number of points closings detected for each spark plug firing.

Many spark plug firings for several engine states (e.g., cranking, running at idle speed, running at moderate speed, etc.) are monitored for measurement of breaker point closing. If a firing has more than one point closure, the points bounced upon closing. If the points bounce more than a predetermined amount (e.g., 20% of the firings), then spring wear is indicated and the decision to replace the breaker points is made. Measurement of voltage drop across the closed breaker points is used with the known measurement circuit to find the resistance of...