Systems and methods for detecting and reducing high driveline torsional levels in automobile transmissions
First Claim
1. A method comprising:
- collecting N turbine speed samples from a transmission;
determining turbine speed from said N turbine speed samples;
determining an engine speed of a vehicle engine;
determining a target frequency indicative of a vibration disturbance in a vehicle based on said turbine speed, said engine speed of said vehicle engine, and a number of cylinders of said vehicle engine; and
adjusting slip in a launch device of said transmission if said target frequency is detected.
20 Assignments
0 Petitions
Accused Products
Abstract
The present disclosure provides systems and methods to detect and reduce any high driveline torsional levels, such as due to the cylinder deactivation in variable displacement system engines or aggressive lock-up strategies for fuel efficiency, in automobile transmissions. The present disclosure utilizes a controller in an automobile to operate a computationally thrifty method for quickly detecting noise and vibration disturbances in the transmission. This quick detection enables fuel economic calibrations that aggressively reduce the disturbances by controlling slip in a launch device of the transmission. As problem disturbances arise, they are detected before occupants notice objectionable behavior. Once detected, the disturbances are reduced, such as by increasing launch device slip, which effectively intercepts the objectionable disturbances before they are transferred through the entire drivetrain. The present disclosure can also apply to launch devices in Dual Clutch Transmissions and Electronically-controlled Manual Transmissions.
31 Citations
20 Claims
-
1. A method comprising:
-
collecting N turbine speed samples from a transmission; determining turbine speed from said N turbine speed samples; determining an engine speed of a vehicle engine; determining a target frequency indicative of a vibration disturbance in a vehicle based on said turbine speed, said engine speed of said vehicle engine, and a number of cylinders of said vehicle engine; and adjusting slip in a launch device of said transmission if said target frequency is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method comprising:
-
collecting N turbine speed samples from a transmission; determining turbine speed from said N turbine speed samples; determining a frequency power based on said turbine speed and based on a target frequency indicative of a vibration disturbance in a vehicle; comparing said frequency power to a threshold; and adjusting slip in a launch device of said transmission if said frequency power exceeds said threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method comprising:
-
collecting N turbine speed samples from a transmission; determining turbine speed from said N turbine speed samples; determining a target frequency indicative of a vibration disturbance in a vehicle based on said turbine speed, said determining said target frequency including determining said target frequency based on a number of cylinders of a vehicle engine; and adjusting slip in a launch device of said transmission if said target frequency is detected.
-
-
20. A method comprising:
-
collecting N turbine speed samples from a transmission; determining turbine speed from said N turbine speed samples; determining a target frequency indicative of a vibration disturbance in a vehicle based on said turbine speed and based on a number of cylinders of a vehicle engine; adjusting slip in a launch device of said transmission if said target frequency is detected; and determining a table index based on said target frequency.
-
Specification