Method of controlling braking of a vehicle operating in a curved path, and vehicle brake control system
AssigneeRobert Bosch GmbH
InventorsWolf-Dieter Jonner, Heinz Leiber, Dieter Roller
Life of this patent
Estimating the term…
Abstract
To counteract the tendency of over-steering when a vehicle operates in a curved path, and one of the wheels--typically the wheel at the inner side of the curve exhibits a tendency to block and, then, braking pressure is reduced to one of the front wheels only, the braking pressure applied to the rear wheel or wheels is reduced. If braking pessure is reduced to both of the front wheels, braking pressure being applied to the rear wheels is controlled, independently, in accordance with anti-brake lock control considerations, which have priority over dropping of braking pressure to prevent over-steering.
Claims17
In an anti-brake lock system (ABS) for a vehicle, controlling application of braking pressure individually to each of the front wheels and to the rear wheels of the vehicle,
- a method of controlling braking pressure being applied to the wheels comprising the combination of the steps of;
- determining if the vehicle moves in a curved path and deriving a curved path signal;
- controlling braking pressure of a first one of the front wheels upon determining in the ABS that said first front wheel has a tendency to block or becomes subject to unstable behavior;
- controlling rise in braking pressure at a second front wheel to a predetermined reduced level to thereby decrease yaw torque;
- and
- limiting the braking pressure being applied to the rear wheels as a function of the determination of tendency to block or unstable behavior of said one front wheel if also the curved path signal indicates movement of the vehicle in the curved path.
Anti-brake lock system for a vehicle subject to yaw torque and with reduced tendency to oversteering comprising:
- means (13) for providing vehicle transverse acceleration signals;
- means (1-6), for controlling braking pressure applied to each of the front wheels, independently, and to the rear wheels of the vehicle for preventing locking of any of the wheels;
- means (10, 11-15) coupled to and responsive to said braking pressure control means for additionally controlling braking pressure applied to a first one of the front wheels and upon a determination that said first front wheel has a tendency to block or become subject to unstable behavior,
- said additional braking pressure control means further controlling rise in braking pressure applied to a second one of the front wheels to a predetermined reduced level upon determining of presence of said transverse acceleration signals, and while braking pressure is applied to said second front wheel under control of said additional braking pressure control means;
- rear wheel braking pressure limiting means (9, 20, 21, 23) for limiting the braking pressure being applied to the rear wheels coupled to said braking pressure control means (1-6);
- and
- means (16, 17, 18, 22) coupled to receive said vehicle transverse acceleration signals and further coupled to said rear wheel pressure limiting means for controlling said rear wheel pressure limiting means as a function of the determination of the tendency to block or unstable behavior of said one of said front wheels and while the transverse acceleration signals are present.
Dependencies are inferred from the claim text.