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Vehicle diagnostic tool utilizing absolute throttle positions vs. engine speeds

  • US 8,200,389 B1
  • Filed: 11/23/2009
  • Issued: 06/12/2012
  • Est. Priority Date: 06/08/2006
  • Status: Active Grant
First Claim
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1. A method of providing information on the operating condition of a Power Plant of a vehicle with instrumentation including a microprocessor;

  • the Power Plant including an engine, a powertrain control module and fuel injectors;

    the microprocessor being programmed to calculate the time the fuel injectors should be on (hereinafter “

    calculated injector on time”

    );

    the microprocessor being programmed to determine the time the fuel injectors are actually on (hereinafter “

    actual injector on time”

    );

    the microprocessor being programmed to extract parameter identification data (hereinafter “

    PID data”

    ), including PID data that provides information on the load on the engine (hereinafter “

    engine load PID data”

    ), from the powertrain control module;

    the microprocessor being further programmed to determine the speed of the engine (hereinafter “

    engine speed”

    );

    the method including the steps of;

    a. acquiring PID data with the instrumentation, including engine load PID data, from the powertrain control module while the engine speed and engine load are changing;

    b. determining with the instrumentation engine speed as the engine speed is changing;

    c. determining with the microprocessor the actual injector on time for the fuel injectors at various engine speeds and engine loads;

    d. determining with the microprocessor the calculated injector on time for such fuel injectors for the various engine speeds and engine loads; and

    e. determining the difference between the actual injector on time and the calculated injector on time for the various engine speeds and engine loads.

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