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METHOD OF VERIFYING COMPONENT FUNCTIONALITY ON EGR & AIR SYSTEMS

  • US 20080148827A1
  • Filed: 12/17/2007
  • Published: 06/26/2008
  • Est. Priority Date: 12/22/2006
  • Status: Active Grant
First Claim
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1. A method for operating an electronically controlled internal combustion engine in a vehicle to perform at least one rationality check on at least one sensor to detect impending sensor failure and verify component functionality;

  • said engine equipped with an engine control system (ECS) having a memory;

    said ECS in electronic communication with various sensors;

    said sensors transmitting data signals to said ECS indicative of associated engine and vehicle component functionality;

    said engine equipped with a coolant system, EGR valve in fluid communication with a manifold having an inlet and an outlet and a turbocharger;

    said method comprising;

    determining engine/vehicle/powertrain operating conditions in which the specified component information from sensor data signals indicative of first and second component functionality;

    determining the measured values of a first and second component from sensor data signals indicative of first and second component functionality;

    comparing said measured value of said first component to said measured value of said second component to determine whether sensor readings from said first and second components are indicative of a component operating within a normal range or indicative of a component or system failure based on an irrational measured values for some of the parametric information that has been evaluated;

    logging an indication of an impending sensor or component failure as a fault in MPU memory if it occurs for a predetermined period of time, occurs more than a predetermined number of times and drive cycles; and

    activating a warning alert to an operator and initiating remedial actions responsive to said indication of impending component or sensor failure.

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