Claims
- 1. A method of determining and indication of internal combustion engine combustion quality, the method comprising the steps of:
- sensing engine speed for each expected firing of individual cylinders of the internal combustion engine;
- determining a band-pass-filtered acceleration estimate value as a function of sensed engine speed;
- determining a difference between a current acceleration estimate value and a preceding acceleration estimate value to provide an acceleration difference value; and
- determining the indication of internal combustion engine combustion quality as a function of the acceleration difference value.
- 2. The method of claim 1 wherein the step of determining the acceleration estimate value comprises determining a difference in engine speed for a selected cylinder firing and a cylinder firing occurring two expected cylinder firings prior to the selected cylinder firing.
- 3. The method of claim 1 wherein the determined indication of combustion quality is used to alter an amount of fuel injected into the internal combustion engine.
- 4. A method of controlling fuel injection with fuel injectors to an internal combustion engine, said method comprising the steps of:
- measuring engine speed for each expected firing of individual cylinders of the internal combustion engine;
- determining a band-pass-filtered acceleration estimate value as a function of measured engine speed;
- determining a difference in successive expected acceleration values so as to provide for an acceleration difference value;
- determining a learned combustion related value as a function of the acceleration difference value; and
- modifying a fuel injection pulse width signal as a function of the learned combustion related value.
Parent Case Info
This application is a continuation-in-part of U.S. application Ser. No. 08/901,859, filed Jul. 29, 1997, now U.S. Pat. No. 5,809,969 and assigned to the same assignee as the instant invention.
US Referenced Citations (9)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
901859 |
Jul 1997 |
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