Torsional vibration solutions for cylinder deactivation
AssigneeEaton Intelligent Power Limited
InventorsJames E. McCarthy, Jr., Barry T. Adams
Life of this patent
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Abstract
A method for operating a 6-cylinder engine connected to a driveline including a transmission. The method includes: monitoring a rotational speed of a crankshaft of the 6-cylinder engine: monitoring a gear selection of the transmission; and operating the 6-cylinder engine in one of Order 3, Order 1.5 or Order 1 based on whether the selected Order avoids operating the 6-cylinder engine at a critical speed that corresponds to a natural harmonic frequency of the driveline, wherein priority is given to operating in Order 1.5, Order 1 then Order 3, in that order.
Claims23
A method of operating a 6-cylinder engine connected to a driveline, the method comprising:
- monitoring a rotational speed of a crankshaft of the 6-cylinder engine;
- monitoring a gear selection of a transmission of the driveline;
- and
- when the transmission is in gears 1 through 5, selectively operating the 6-cylinder engine in Order 1.5 when the speed of crankshaft is less than 1160 RPM and operating the 6-cylinder engine in Order 1 when the speed of crankshaft is less than 1720 RPM.
2-6. (canceled)
A method for operating a 6-cylinder engine connected to a driveline, the method comprising:
- monitoring a rotational speed of a crankshaft of the 6-cylinder engine;
- monitoring a gear of a transmission of the driveline;
- and
- selectively operating the 6-cylinder engine in one of Order 3, Order 1.5 or Order 1 based on the following criteria in the following order:
- first, operating the 6-cylinder engine in Order 1.5 if the rotational speed of the crankshaft is not within a predetermined differential speed of a critical speed of the crankshaft for the engine in Order 1.5 for the gear of the transmission, wherein the critical speed causes the driveline to vibrate at a natural harmonic frequency of the driveline,
- second, operating the 6-cylinder engine in Order 1 if the rotational speed of the crankshaft is not within a predetermined differential speed of a critical speed of the crankshaft for the engine in Order 1 for the gear of the transmission, wherein the critical speed in the gear causes the driveline to vibrate at a natural harmonic frequency of the driveline,
- else, operating the 6-cylinder engine in Order 3.
(canceled)
A method for operating a 6-cylinder engine connected to a driveline including a transmission, the method comprising:
- monitoring a rotational speed of a crankshaft of the 6-cylinder engine;
- monitoring a gear selection of the transmission;
- and
- operating the 6-cylinder engine in one of Order 3, Order 1.5 or Order 1 based on whether the selected Order avoids operating the 6-cylinder engine at a critical speed that corresponds to a natural harmonic frequency of the driveline, wherein priority is given to operating in Order 1.5, Order 1 then Order 3, in that order.
(canceled)
Dependencies are inferred from the claim text.