Motor vehicles – With means responsive to speed of vehicle for maintaining... – Including fluid pressure actuated servomechanism
Patent
1984-10-15
1987-04-28
Mitchell, David M.
Motor vehicles
With means responsive to speed of vehicle for maintaining...
Including fluid pressure actuated servomechanism
74868, 180178, B60K 3100
Patent
active
046606726
ABSTRACT:
In order to prevent hunting between a selected gear ratio (e.g. overdrive) and the next lower one, when a vehicle ascends a slope or incline under "cruise control" an automatic speed control device (ASCD) which controls the opening of the engine throttle under the cruise control mode, upon being put into operation issues a control signal to the transmission control circuit which allows the latter to upshift the transmission to the predetermined gear ratio (viz., overdrive) and which renders the transmission control circuit incapable of downshifting to the next lower gear while the ASCD is functioning. Upon the vehicle speed falling a predetermined amount below the preselected target value, the ASDC issues a signal directly to the transmission to cause a downshift to the next lower gear ratio. Following such a downshift, the ASDC inhibits subsequent upshifting either for a predetermined period of time or until the load which necessitated the downshift disappears.
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patent: 4563918 (1986-01-01), Sugano
patent: 4580466 (1986-04-01), Iwanaga
Mitchell David M.
Nissan Motor Co,. Ltd.
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