Two-Stage Acceleration Strategy for Speed Limit Termination
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Solution Overview
Problem
Existing driver assistance systems do not effectively determine and implement an acceleration strategy when a speed limit is terminated, failing to provide a smooth and rule-compliant acceleration to the new maximum speed, which is agreeable to the driver.
Innovation Solution
A driver assistance system comprising a detection system for identifying speed limit terminations, a notification system to request driver approval, and a functional unit that determines a two-stage acceleration strategy, allowing automatic implementation only after driver acknowledgment, ensuring compliance with traffic rules and providing a comfortable and quick acceleration to the new target speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic acceleration is implemented immediately when speed limit terminates, then productivity is improved by reducing waiting time, but ease of operation deteriorates as the acceleration may not be agreeable to the driver
Solution Approach 1:
The system determines the acceleration strategy in advance when the speed limit termination is detected, but delays actual acceleration until the driver acknowledges the notification. This preliminary determination allows the system to prepare an agreeable acceleration profile that considers driver preferences, while still responding quickly once approval is given.
Solution Approach 2:
The system outputs a notification to the driver and waits for acknowledgment before implementing acceleration. This feedback loop ensures the driver is aware of and approves the acceleration action, making the system more acceptable to drivers while maintaining efficient response times.
2Reliability
If acceleration strategy is determined in advance, then reliability is improved by ensuring rule compliance, but loss of time increases due to notification and acknowledgment requirements
Solution Approach 1:
The acceleration strategy is determined in advance when the speed limit termination is detected, ensuring that the acceleration profile is pre-calculated to comply with traffic rules. The notification and acknowledgment process does not delay the strategy determination itself, only the execution, minimizing time loss while maintaining reliability.
3Ease of operation
If two-stage acceleration strategy is used, then ease of operation is improved by replicating natural driving behavior, but device complexity increases
Solution Approach 1:
The acceleration process is divided into two stages: first acceleration to the maximum permitted speed, then acceleration to the desired speed. This segmentation replicates natural driving behavior where drivers typically accelerate to the legal limit first, then continue accelerating. The segmentation is implemented through software control logic that manages the transition between stages, adding minimal complexity compared to the benefit of natural behavior replication.
Data Source
AI summary
A driver assistance system in a motor vehicle includes a detection system for detecting upcoming events which permit an increase in current speed as a result of the lifting of a restriction on a currently valid speed, a functional unit for determining an acceleration strategy for increasing the speed, and an information system for issuing request information to the driver to allow automatic implementation of the acceleration strategy. The functional unit initiates the automatic implementation of the acceleration strategy upon confirmation by the driver of the request information. The request information can be issued to the driver already at a defined point in time before the upcoming event that lifts the restriction on the current speed. If the driver confirms the request information before the upcoming event that lifts the restriction on the current speed has been reached, the functional unit initiates an acceleration strategy that is composed of two-stages.