Motor vehicles – With means responsive to speed of vehicle for maintaining... – Including fluid pressure actuated servomechanism
Patent
1990-06-04
1991-12-24
Mitchell, David M.
Motor vehicles
With means responsive to speed of vehicle for maintaining...
Including fluid pressure actuated servomechanism
74859, 180178, 36442604, B60K 3108
Patent
active
050743716
ABSTRACT:
A system and method for automatically controlling a vehicle's speed to a desired cruise speed, for a vehicle in which a torque converter and an automatic transmission are mounted are disclosed in which, when the vehicle speed is controlled so as to conicide with the desired cruise speed by means of an automatic (vehicle) speed control device (ASCD) associated with the vehicle engine, deviation of a present vehicle speed from a desired cruise speed is derived. When a first predetermined degree of deviation is reached, the lock-up state of a lock-up device in the torque converter is inhibited. When the deviation further reaches a second predetermined degree of deviation, the second predetermined deviation being greater than the first, the automatic transmission is operated to inhibit a maximum speed gear range (e.g. a fourth speed range is downshifted to a third speed gear range). When the vehicle speed is returned to the cruise speed via the inhibition of the maximum speed gear range, the inhibit is released and thereafter lock-up inhibit is also released.
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Mitchell David M.
Nissan Motor Company Limited
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