Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1996-04-23
1998-05-26
Nguyen, Tan Q.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
701 54, 701 94, 701 95, 477107, 180170, B60K 3104
Patent
active
057583064
ABSTRACT:
This invention relates to a vehicle cruise controller which controls engine output and gear shift position such that a detected vehicle speed is identical to a target vehicle speed. A shift to lower gear is performed when a difference between the target vehicle speed and detected vehicle speed reaches a first predetermined value .alpha..sub.1. A mechanism is provided for estimating a travel resistance of the vehicle, the travel resistance when this difference has reached a second predetermined value .alpha..sub.2 which is less than the first predetermined value .alpha..sub.1, being learnt as a maximum drive torque FB of the engine. A shift to higher gear is made when the estimated travel resistance has become less than this learnt maximum drive torque FB after the shift to lower gear. In this way, gear shift hunting during cruise control when the vehicle is climbing or descending slopes, is suppressed.
REFERENCES:
patent: 5012419 (1991-04-01), Yamamoto
patent: 5038880 (1991-08-01), Matsuoka et al.
Nguyen Tan Q.
Nissan Motor Co,. Ltd.
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