Adaptive Cruise Control Adaptation to Anticipating Scenario Based Target Behavior

摘要

Although sensors detect targets from as far away as 200 meters, determining a target as being in path comes much later when the target is closer in range. A significant component of this in path determination is sensors having confidence that targets are plausible and indeed are in path. However, the time and distance between detection and reaction to allow for sensor confidence results in late braking for a target. For the driver, the braking can seem abrupt and for the passenger, even frightening. This invention accounts for multiple scenarios in which a controlled propulsion torque reduction for a calibrated time eases the transition to eventual braking and stopping. This torque reduction occurs between the target's initial detection and when the sensors' confidence places the target in path. This approach identifies the driving scenario, assesses the driver's intent based on set speed and objects in the environment, and applies a torque reduction response that a cautious driver would exhibit. The novelty is that this is a middle ground approach that uses multiple sensor inputs and traffic patterns rather than a single sensor in path determination. For cases that appropriately predict ensuing braking, this results in a natural torque reduction-to-brake experience. For cases that falsely predict ensuing braking, a subtle torque reduction causes a speed error that eventually times out and could go unnoticed if small enough in magnitude.