Evasion Assist System Phase-Steering Control
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Solution Overview
Problem
Existing evasion-assist systems in vehicles face the challenge of being overridden by drivers' countersteering during emergency braking, which can impede the automatic execution of evasive maneuvers due to fear of vehicle loss of control, potentially leading to unsuccessful maneuvers.
Innovation Solution
The system initiates an evasive maneuver by exclusively intervening in transverse dynamics in the first phase, signaling to the driver that the evasion-assist system is active, thereby reducing the likelihood of countersteering and allowing a later intervention in longitudinal dynamics, such as braking, to ensure a successful maneuver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the evasion-assist system intervenes in both transverse and longitudinal dynamics simultaneously, then the evasive maneuver can be executed more effectively, but the driver may countersteer due to fear of loss of control, impeding the maneuver
Solution Approach 1:
The patent divides the evasive maneuver into two sequential phases: first phase intervenes only in transverse dynamics (steering), second phase intervenes in both transverse and longitudinal dynamics (steering + braking). This segmentation allows the driver to accept the initial steering intervention before the more intrusive braking intervention, reducing countersteering while maintaining maneuver effectiveness
Solution Approach 2:
The system performs preliminary intervention in transverse dynamics before intervening in longitudinal dynamics. By first establishing the evasive steering maneuver and allowing the driver to accept this intervention, the system prepares the driver for the subsequent braking action, reducing the likelihood of countersteering when braking is applied
2Speed
If emergency braking is initiated immediately in an evasive maneuver, then the longitudinal dynamics are controlled, but the driver's instinctive countersteering may impede the transverse evasive action
Solution Approach 1:
The patent segments the intervention into transverse-only phase followed by combined transverse-longitudinal phase, ensuring that braking is applied only after the driver has accepted the steering intervention, thereby maintaining both rapid response and high execution quality
Solution Approach 2:
The system applies preliminary steering intervention before longitudinal braking intervention, preparing the driver for the sequence of events and ensuring that the evasive maneuver is already underway before braking is applied, maintaining rapid response while ensuring proper execution
Data Source
AI summary
An evasion and brake-assist system for motor vehicles, having a sensory system for sensing the traffic environment of the vehicle, an actuator system for interventions in a steering system and a brake system of the vehicle, and having an electronic control device in which an emergency evasion function is implemented that checks whether an emergency evasive maneuver is necessary based on the data supplied by the sensory system and then acts on the dynamics of the vehicle via the actuator system to assist the vehicle driver in initiating and/or executing the emergency evasive maneuver, characterized in that in the first phase of an evasive maneuver, the emergency evasion function intervenes exclusively in the transverse dynamics, and only after this phase, decides whether an intervention in the longitudinal dynamics will also take place.