Automatic Brake Control Device
First Claim
1. An automatic brake control device comprising control means which automatically performs brake control based on a sensor output including a distance between a subject vehicle and an object existing ahead the subject vehicle even if there is no driving operation, whereinthe control means includes stepwise brake control means which automatically performs stepwise brake control when an estimated value of time elapsed until a distance between the object and the subject vehicle derived based on a relative distance and a relative speed of the object and the subject vehicle obtained by the sensor output becomes a predetermined distance or less becomes less than a predetermined value.
1 Assignment
0 Petitions
Accused Products
Abstract
A stepwise brake control is automatically performed when TTC obtained according to a relative distance and a relative speed between a vehicle and an object is lower than a predetermined value. For example, a brake force or a brake reduction speed is gradually increased over a plurality of stages in time series. Moreover, a brake force or a brake reduction speed change ratio in the section from the rise point of a brake force or a brake reduction speed at each stage to a predetermined brake force or a brake reduction speed is made a predetermined value or a change process is made a change process along a curved shape defined by a predetermined function. Moreover, at the initial stage when gradually increasing the brake force or the brake reduction speed, an auxiliary brake is used. Alternatively, a caution stage having a brake force or a brake reduction speed smaller that the initial stage is provided at the stage preceding the first stage of the plurality of stages, so that the auxiliary brake is used at this caution stage.
-
Citations
8 Claims
-
1. An automatic brake control device comprising control means which automatically performs brake control based on a sensor output including a distance between a subject vehicle and an object existing ahead the subject vehicle even if there is no driving operation, wherein
the control means includes stepwise brake control means which automatically performs stepwise brake control when an estimated value of time elapsed until a distance between the object and the subject vehicle derived based on a relative distance and a relative speed of the object and the subject vehicle obtained by the sensor output becomes a predetermined distance or less becomes less than a predetermined value.
Specification