Torque converter lock-up control for automatic transmission havi

Details Torque converter lock-up control for automatic transmission havi Torque converter lock-up control for automatic transmission havi

1999-04-09

2000-10-31

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

477169, 477175, F16H 6114

Patent

active

061394661

ABSTRACT:
A torque converter lock-up clutch controlling system for a vehicle drive train inputs a vehicle speed signal and an engine load signal. The vehicle drive train includes an automatic transmission operable in a manual ("M") ratio change mode when an operator selects a "M" range position. The system enables the automatic transmission to behave like a manual transmission upon selection of the "M" range position. A memory includes a "M" range lock-up shift point map for storing data which relates the lock-up application and release to the vehicle speed and engine load signals. The "M" range lock-up shift point map includes lock-up application values, which correspond to the magnitudes of the vehicle speed signal at which lock-up clutch applications are to occur. The magnitudes of the vehicle speed signal at which lock-up clutch applications are to occur are determined in a manner as a function of the magnitudes of the engine load signal. The "M" range lock-up shift point map includes a lock-up release value which corresponds to the magnitude of the vehicle speed signal at which lock-up clutch releases are to occur regardless of the magnitudes of the engine load signal. A controller receiving the vehicle speed and engine load signals, retrieves data from the "M" range lock-up shift point map and processes the retrieved data to produce a lock-up signal. A lock-up actuator controls the toque converter lock-up clutch in response to the lock-up signal.

REFERENCES:
patent: 4495576 (1985-01-01), Ito
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4811827 (1989-03-01), Ishikawa et al.
patent: 5505670 (1996-04-01), Inuzaka et al.
patent: 5683327 (1997-11-01), Inuzaka et al.
"Nissan Full-Range Electronically Controlled Automatic Transmission of the RE4R01A Type", Mar. 1987; pp. I-24 through I-30.

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