An On-Line Pressure Monitor for EFI-Control-Unit Test Diagnostics

This paper describes an on-line pressure-monitoring system, designed to meet an urgent need for constant accuracy surveillance on the precision pressures that are applied to EFI Electronic Control Units during production calibration and test. Design requirements and approach are discussed, and system implementation and performance are detailed. The Pressure Monitor, which operates in both a SCAN and a SET mode, detects and measures pressure deviations in up to 39 precision pressure sources, and activates an alarm to alert test personnel should an out-of-tolerance condition develop. It has significantly reduced the incidence of test-operator error, and has played a major role in substantially increasing production yields.