Trimmed lock-up clutch
First Claim
1. A method of damping torsional vibrations in a drive line including a clutch, the method comprising the steps of:
- controlling a clutch slip speed of the clutch, and an output shaft speed of the drive; and
wherein said controlling step includes maintaining a positive slope of a total torque of the drive line versus the clutch slip speed and wherein the maintaining the positive slope of the total torque of the drive line versus the clutch slip speed occurs at a slip speed of less than about 30 rotations per minute.
2 Assignments
0 Petitions
Accused Products
Abstract
In order to reduce torsional vibrations in a drive including a torque converter with a turbine and impeller, clutch slip speed of the drive is adjusted by manipulation of clutch pressure. This may be done in either closed loop mode or open loop mode by setting the clutch pressure to a predetermined value or continuously adjusting clutch pressure. Pressure is adjusted to produce a positively sloped function of sensed total torque of the clutch and turbine over the clutch slip speed. This produces extended service life of the drive train components, greater efficiency of the torque converter, and smoother operation of the drive.
53 Citations
32 Claims
-
1. A method of damping torsional vibrations in a drive line including a clutch, the method comprising the steps of:
-
controlling a clutch slip speed of the clutch, and an output shaft speed of the drive; and wherein said controlling step includes maintaining a positive slope of a total torque of the drive line versus the clutch slip speed and wherein the maintaining the positive slope of the total torque of the drive line versus the clutch slip speed occurs at a slip speed of less than about 30 rotations per minute. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method of reducing torsional vibrations in a drive line, the method comprising the steps of:
-
providing a clutch for the drive; providing a torque converter with an impeller and a turbine within the torque converter configured to engage the clutch; monitoring total torque including a clutch torque and a turbine torque; monitoring a clutch slip speed; continuously comparing total torque with clutch slip speed during operation of the drive line; and maintaining a clutch slip speed such that the total torque divided by clutch slip speed produces a positively sloped function over time. - View Dependent Claims (24, 25, 26)
-
-
27. A system for damping torsional vibrations in a drive line without a use of a vibration absorbing coupling, the system comprising:
-
a controller that continuously compares a total torque, including a sum of clutch torque added to a turbine torque, and a clutch slip speed during operation of the drive; and maintains the clutch slip speed such that the continuous comparison of total torque and clutch slip speed produces a positively sloped function of total torque over clutch slip speed. - View Dependent Claims (28, 29, 30, 31, 32)
-
Specification