Transmission control system
Electronic device controlling the bridging or locking of a hydrodynamic torque converter and method of application
Apparatus for decreasing jolts during gear shifts in automatic transmissions in motor vehicles
Lock-up control method of and system for automatic transmission for automotive vehicle having engine provided with fuel cut means
Friction clutch control device Patent #: 4428467
ApplicationNo. 07/036467 filed on 04/09/1987
US Classes:477/54, Engine controlled192/3.29, Having fluid-pressure operator477/73, Engine controlled477/85Plural speed signals
ExaminersPrimary: Bonck, Rodney H.
Assistant: Lorence, Richard M.
Attorney, Agent or Firm
International ClassesF16H 61/14 (20060101)
F16H 59/38 (20060101)
F16H 59/46 (20060101)
F16H 61/04 (20060101)
Foreign Application Priority Data1986-04-14 JP
AbstractDetermination of the engagement of a lockup clutch is performed in a system for integrally controlling an automatic transmission and an engine, wherein gear stages can be automatically switched in accordance with a preset map, the lockup clutch of a torque converter is engageable during at least one gear stage, and engine torque is changed during shifting to maintain satisfactory shift characteristics. The engagement is determined not only in response to an engaging signal of the lockup clutch from the computer, but also in consideration of a time lag after the engaging signal is turned ON. Alternatively, engagement is determined by detecting the rotary speeds of the engine and the turbine of the torque converter when the engaging signal is ON. As a result, mistaken determinations of engagement of the lockup clutch are avoided.