System for integrally controlling an engine and an automatic transmission having a device for determining engagement of the lockup clutch when a certain time duration elapses after output of an engagement signal
Patent 4819777 Issued on April 11, 1989. Estimated Expiration Date: 
April 9, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 9, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesTransmission 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 InventorsAssigneeApplicationNo. 07/036467 filed on 04/09/1987US Classes:477/54, Engine controlled192/3.29, Having fluid-pressure operator477/73, Engine controlled477/85Plural speed signalsExaminersPrimary: Bonck, Rodney H.Assistant: Lorence, Richard M. Attorney, Agent or FirmInternational ClassesF16H 61/14 (20060101)F16H 59/38 (20060101) F16H 59/46 (20060101) F16H 61/04 (20060101) Foreign Application Priority Data1986-04-14 JPAbstractDetermination 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. | |
