Port expansion unit for engine management controller - includes comparator units coupled to interrupt generator to indicate faults in load circuits

摘要

An electronic engine management system has a number of interface modules (1, 1') coupled to loads and are connected to the post expansion circuit (2) of the microcontroller. Each interface monitors for short circuits or line breaks. The port expansion unit has an interrupt line (6) connection with the controller. Internally the expansion unit has registers (13, 14, 13', 14') and comparators (11, 12, 11', 12'). The comparators connect via error registers (15, 16, 15'. 16') with the interrupt signal generator (17), which is triggered when any fault occurs. ADVANTAGE - Simplified means of identifying faults.