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Self-diagnosis device and process for a micro-computer control system for a motor-vehicle internal combustion engine

  • US 4,896,276 A
  • Filed: 04/21/1986
  • Issued: 01/23/1990
  • Est. Priority Date: 05/14/1985
  • Status: Expired due to Fees
First Claim
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1. Self-diagnosis device for verifying the functionality of a control system with programmed micro-computer for controlling preselected operative parameters of an i.c. engine, said micro-computer being operatively connected to sensors of determined engine parameters and to actuators of determined operative parameters of the same engine, said self-diagnosis device comprising indicator means for indicating the functional state of said micro-computer, of said sensors and of said actuators, connection means operatively connectable to said micro-computer and in turn connected to said sensors and actuators, said micro-computer being also programmed to execute on command a preestablished sequence of operations to check the functional state of components of said micro-computer and of said sensors and actuators and to display their state through said indicator means, said microcomputer being further programmed to execute on command a preestablished sequence of operations to check the functional state of said sensors and said actuators by using operation simulating signals.

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