Preceding vehicle follow-up control system

Details Preceding vehicle follow-up control system Preceding vehicle follow-up control system

2000-06-12

2002-05-14

Nguyen, Tan (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Indication or control of braking, acceleration, or deceleration

C701S096000, C701S301000, C342S070000, C342S071000, C340S903000

Reexamination Certificate

active

06389351

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a preceding vehicle follow-up control system for enabling a controlled vehicle to recognize a preceding vehicle and to follow up the preceding vehicle while keeping a vehicle-to-vehicle distance.
Japanese Patent Provisional Publication No. 10-114237 has disclosed a conventional follow-up control system which is arranged to cancel a follow-up control according to an accelerating condition of the controlled vehicle.
SUMMARY OF THE INVENTION
Although this conventional preceding vehicle follow-up control system is basically arranged to stop the follow-up control when a difference between the throttle opening detected value and the throttle opening estimate becomes greater than a threshold, it is arranged to automatically resume the follow-up control when an accelerator pedal is released. This arrangement yet includes problems to be improved in drive feeling.
It is therefore an object of the present invention to provide a preceding vehicle follow-up control system which smoothly resume a follow-up control after canceling the follow-up control during an acceleration based on a driver's demand.
A preceding vehicle follow-up control system according to the present invention is for a vehicle and comprises a vehicle-to-vehicle distance detector, a vehicle speed detector, an accelerating operation detector and a controller connected thereto. The vehicle-to-vehicle distance detector detects a distance between a controlled vehicle and a preceding vehicle and outputs a signal indicative of the vehicle-to-vehicle distance. The vehicle speed detector that detects a vehicle speed of the controlled vehicle and outputs a signal indicative of the controlled-vehicle speed. The accelerating operation detector that detects whether an accelerating operation based on a driver's demand is executed. The controller is arranged to calculate a target vehicle speed employed for bringing the vehicle-to-vehicle distance closer to a target vehicle-to-distance on the basis of the vehicle-to-vehicle distance and the controlled-vehicle speed, to control the controlled-vehicle speed to bring the controlled-vehicle speed closer to the target vehicle speed, to detect whether the controlled-vehicle speed is greater than a control continuation decision value which is greater than an upper limit of a settable range of a set vehicle speed, to decelerate the controlled-vehicle speed to the set vehicle speed at a rate of a preset deceleration when the controlled-vehicle speed is greater than the control continuation decision value and when the accelerating operation is not executed.


REFERENCES:
patent: 4622636 (1986-11-01), Tachibana
patent: 5396426 (1995-03-01), Hibino et al.
patent: 5731977 (1998-03-01), Taniguchi et al.
patent: 5959572 (1999-09-01), Higashimata et al.
patent: 6070682 (2000-06-01), Isogai et al.
patent: 6298298 (2001-10-01), Tange et al.
patent: 19743546 (1998-04-01), None
patent: 0484995 (1992-05-01), None
patent: 0 874 149 (1998-10-01), None
patent: 10-114237 (1998-05-01), None

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