Vehicle Start-Stop Control Using Route Information
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Solution Overview
Problem
Existing automatic start-stop systems in motor vehicles can disrupt quick start-ups, posing safety risks by delaying the restart of the drive unit when switching off and on, especially in situations like entering a roundabout or freeway from a standstill.
Innovation Solution
A method that uses position-related route information to determine if the drive unit should be switched off, only querying further boundary conditions if the route information does not meet specific criteria, thereby preventing unnecessary automatic shutdowns in critical traffic situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the control device automatically switches off the drive unit when stationary to save fuel, then fuel consumption is reduced, but the restart time is delayed causing safety risks in critical traffic situations
Solution Approach 1:
The control device dynamically adjusts its switching behavior based on the vehicle's operational context. By evaluating route information and identifying critical traffic situations (roundabouts, intersections, merging zones), the system adaptively decides whether to switch off the drive unit or maintain it running, optimizing both fuel efficiency and restart responsiveness according to current driving conditions
Solution Approach 2:
The control device continuously receives feedback from navigation systems and traffic information sources about the vehicle's location and upcoming route features. This feedback loop enables the system to anticipate critical situations and adjust the drive unit switching strategy in advance, ensuring that the drive unit remains operational when quick restart is needed while switching off in less critical situations to save fuel
2Measurement precision
If the control device queries multiple boundary conditions before switching off the drive unit, then switching accuracy is improved, but system complexity and processing time increase
Solution Approach 1:
The control logic is segmented into hierarchical evaluation stages. The system first evaluates route information and identifies critical traffic situations, then selectively queries additional boundary conditions only when needed. This segmentation allows the system to maintain high decision accuracy by considering multiple factors while avoiding the complexity of evaluating all possible conditions in every situation
Solution Approach 2:
The control device applies partial action by querying only the necessary subset of boundary conditions based on the current traffic situation. In critical situations identified through route information, the system may skip certain boundary condition queries or use simplified evaluation criteria, reducing processing overhead while maintaining sufficient switching accuracy for safety-critical decisions
Data Source
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Figure 3~4
AI summary
The method involves determining item-related road information, where a control device (2) of a motor car (1) automatically and driver independently switches off a drive unit (3) of the motor car at a standstill condition as a function of the item-related road information and a boundary condition. A query to check whether the boundary condition is established, is avoided when the information satisfies road related criteria. The drive information is determined over a navigation device (4) and/or a surrounding field of the motor car is sensed by a vehicle environment sensor system (5). The vehicle environment sensor system is designed as a radar sensor. The drive unit is designed as an internal combustion engine. The boundary conditions are selected from engine speed and tire revolution. The road is selected from an in town or an out of town i.e. highway. An independent claim is also included for a motor car.