Fuel identifier algorithm
AssigneeDaimlerChrysler AG
InventorsBrian J. Nelson, Joseph B. Adams, Luiz R. Alicke, Jason E. Wielenga
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Abstract
A method for identifying high driveability index fuel for use in a motor vehicle engine includes the steps of determining an engine rotational speed after the engine has started, measuring an elapsed time required for the engine rotational speed to increase from a predetermined low limit to a predetermined high limit, and identifying high driveability index fuel when the elapsed time is greater than a predetermined time limit.
Claims20
A method for identifying high driveability index fuel for use in a motor vehicle engine, the method comprising the steps of:
- determining an engine rotational speed;
- beginning to measure an elapsed time once said engine rotational speed reaches a predetermined low limit
- ceasing to measure said elasped time once said engine rotational speed reaches a predetermined high limit wherein said predetermined low limit and said predetermined high limit define a window capturing the lowest rate of said engine rotational speed;
- and
- identifying high driveability index fuel when said elapsed time is greater than a predetermined time limit.
A method for controlling an engine of a motor vehicle comprising the steps of:
- determining an engine rotational speed;
- measuring a rate of increase of said engine rotational speed from a predetermined low limit to a predetermined high limit;
- and
- determining if a high driveability index fuel is present by comparing said rate of increase to a predetermined rate;
- and
- modifying an engine control parameter to account for the presence of said high driveability index fuel by revising a roughness goal to compensate for the lesser volatility of said high driveability index fuel.
A method for controlling an engine of a motor vehicle comprising the steps of:
- determining an engine rotational speed;
- measuring a rate of increase of said engine rotational speed from a predetermined low limit to a predetermined high limit;
- determining if a high driveability index fuel is present by comparing said rate of increase to a predetermined rate;
- determining when a throttle is open;
- and
- modifying an engine control parameter to account for the presence of said high driveability index fuel if said throttle is open when the engine is started.
A method for controlling an engine of a motor vehicle comprising the steps of:
- determining an engine rotational speed;
- measuring a rate of increase of said engine rotational speed from a predetermined low limit to a predetermined high limit;
- determining if a high driveability index fuel is present by comparing said rate of increase to a predetermined rate;
- determining when the engine was last run;
- and
- modifying an engine control parameter to account for the presence of said high driveability index fuel if the engine was run in less than a predefined time period.
An engine control system for a motor vehicle comprising:
- a control module and
- a fuel identifier module for determining the presence of a high driveability index fuel, said fuel identifier module in communication with said control module, said control module notifying said engine control system if said high driveability index fuel is present comprising a counter to determine a length of time for an engine rotational speed to pass from a low limit to a high limit and wherein said length of time ranges from about 0.08 seconds to 0.26 seconds.
An engine control system for a motor vehicle comprising:
- a control module;
- a fuel identifier module for determining the presence of a high driveability index fuel, said fuel identifier module in communication with said control module, said control module notifying said engine control system if said high driveability index fuel is present;
- and
- an initialization module includes a history register to record the presence of said high driveability index fuel over time, said initialization module sending a signal indicating the presence of high driveability index fuel if the history register contains a certain frequency of records.
Dependencies are inferred from the claim text.