COMPUTER-AIDED ENGINE DIAGNOSTIC SYSTEM

摘要

Diagnosis of an electronically fuel injected engine equipped with sensors connec ted to an on-board microcomputer. Use of a standard personal or portable computer (41) and a connector (43) for electrica l connection to the sensors and the on-board computer. An interface device (40) is connected between the connector (43) and t he computer (41) to enable the computer (41) to read the values of the operational parameters of the engine as detected by the sensor s, and to perform a diagnostic software comparison of the measured values with predetermined values or ranges. The interface device (40) is switchable to a selected or the on-board computer under software control from the computer (41), and includes a multiple mode measurement device which is also selectively switched to a desired measurement mode by the computer (41). The com puter (41) is then able to selectively measure the operational parameters of the engine, test for correct operation, and displa y the appropriate diagnostic or tutorial instructions for fault location and rectification. The computer (41) is also able to feed dat a to the on-board computer for testing same.