Browse Prior Art Database

Application of Conventional Automotive Manifold Absolute Pressure Sensor As Engine Diagnostic Instrument

IP.com Disclosure Number: IPCOM000036004D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Goldberg, WD: AUTHOR [+4]

Abstract

This article describes the use of an automotive vehicle manifold absolute pressure (MAP) sensor component as a tool to provide valve and air intake characteristics for each cylinder to a diagnostic system.

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Application of Conventional Automotive Manifold Absolute Pressure Sensor As Engine Diagnostic Instrument

This article describes the use of an automotive vehicle manifold absolute pressure (MAP) sensor component as a tool to provide valve and air intake characteristics for each cylinder to a diagnostic system.

Typically, when vacuum leaks are suspected, a technician terminal directs the technician to spray carburetor cleaner at the intake manifold gasket surfaces and to look for changes in engine RPM. If the technician is not using a tachometer or other RPM indicator, changes in the sound of the engine must be relied on to infer a change in engine RPM. If a vacuum leak is slight, the change in RPM may be small and not reliably detectable by ear. In another instance, the technician terminal directs the technician to use a vacuum gauge to read engine intake manifold vacuum. It then asks the technician if the reading was acceptable. Both of the procedures above are subject to human interpretation. The technique disclosed therein eliminates human interpretation.

The human element is removed by making use of an existing MAP sensor. A vehicle probe interface (VPI) is added, as shown in the drawing. The VPI has the capability to connect the MAP sensor and capacitively coupled spark detector to the technician terminal, it is necessary to previously determine if the sensor is good or bad. The operational condition of the sensor will be determined while the sensor is in use...