Longitudinal Driver Assistance for Anticipatory Speed Setpoint Changes
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Solution Overview
Problem
Existing longitudinal driver assistance systems in vehicles lack efficient adaptation of speed to changing setpoints, leading to uncomfortable and inefficient driving behaviors, especially when encountering multiple events like curves, roundabouts, and speed limits, resulting in inappropriate decelerations that can impede traffic flow.
Innovation Solution
A longitudinal driver assistance system that includes a first detection system for identifying increased and reduced setpoint speeds, a second detection system for anticipating deceleration potential, and a functional unit that adjusts acceleration behavior based on location-dependent events, ensuring smooth transitions and reduced acceleration potential to maintain comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle accelerates to an increased setpoint speed without anticipating subsequent deceleration events, then the acceleration performance is improved, but the driving comfort deteriorates due to unnecessary decelerations and traffic flow disruption
Solution Approach 1:
The system performs preliminary identification of upcoming events (curves, roundabouts, speed limits) and anticipates required deceleration before reaching those locations. By calculating the deceleration potential needed to reach subsequent events, the system adjusts acceleration behavior in advance, preventing unnecessary speed increases that would require abrupt deceleration later, thereby maintaining both acceleration performance and driving comfort
2Ease of operation
If the system frequently adapts speed to match every upcoming event, then the driving comfort is improved, but the productivity deteriorates due to excessive speed reductions impeding traffic flow
Solution Approach 1:
The system dynamically changes the acceleration parameter based on the calculated deceleration potential and distance to upcoming events. By adjusting acceleration magnitude rather than simply reducing speed, the system maintains smoother velocity profiles that improve comfort while minimizing disruptions to traffic flow, as the vehicle adapts its acceleration behavior to anticipated events rather than reacting with abrupt decelerations
Data Source
AI summary
A longitudinal driver assistance system is provided in a motor vehicle. A first detection system identifies a first event which, starting from an actual speed, leads to the specification of an increased target speed at a predefined location-dependent first moment in time, and for identifying a subsequent second event which, starting from the increased target speed, leads to the specification of a target speed that is reduced in relation thereto at a predefined location-dependent second moment in time. A second detection system identifies, in an anticipatory manner, a predefined deceleration potential starting from the increased target speed to the reduced target speed. A functional unit reduces the acceleration to the increased target speed if, otherwise, the subsequent deceleration to the reduced target speed with the predefined deceleration potential cannot be completed at the location-dependent moment in time of the second event.