Vehicle Collision Parameter Correction via Common Time Basis
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Solution Overview
Problem
Integrated safety systems for vehicles face latency issues due to varying computing and transmission times in anticipatory environment-sensor systems, leading to uncertainties in collision parameter determination and reduced effectiveness in triggering protective functions.
Innovation Solution
Establishing a common time basis within the vehicle allows for the correction of collision parameters by accounting for signal age and latency times, enabling more accurate preprocessing and triggering of precrash functions, such as reversible and irreversible restraint devices, through a method involving a time-master unit and evaluation and control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common time basis is established and collision parameters are corrected for signal age and latency, then measurement precision and reliability of collision parameters are improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent introduces a time master unit as an intermediary component that provides a common time basis to all network users in the vehicle. This mediator enables precise measurement of signal age and latency times without requiring complex synchronization protocols between all components, thus improving collision parameter accuracy while limiting the increase in system complexity.
Solution Approach 2:
The system performs preliminary time stamping of collision parameters at the source and pre-calculates latency times based on the common time basis. This preliminary action allows downstream evaluation to correct collision parameters without performing complex real-time calculations, improving precision while managing computational complexity.
2Reliability
If latency times and signal age are ascertained and collision parameters are corrected, then reliability of precrash functions is improved, but processing time and computational load increase
Solution Approach 1:
The system performs preliminary time stamping of collision parameters and pre-determination of latency times using the common time basis. This allows downstream evaluation to simply read pre-calculated values and apply corrections, improving precrash function reliability while minimizing additional processing time.
Solution Approach 2:
Each network user independently determines its own latency time to the time master and uses this information to correct its collision parameters. This self-service approach distributes computational load rather than requiring centralized processing, improving reliability while reducing overall processing time.
3Manufacturing precision
If correction of collision parameters is performed for varying data quantities and transmission times, then manufacturing precision of safety responses is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of time reference from component-specific clocks to a common time basis provided by the time master. This parameter change enables consistent correction of collision parameters across varying data quantities and transmission times without requiring complex adaptive algorithms, thus improving safety response precision while limiting complexity increase.
Data Source
AI summary
In a method for correcting at least one collision parameter determined by an anticipatory environment-sensor system of a vehicle and in a corresponding integrated safety system of the vehicle, a common time basis is established in the vehicle, a signal age and/or a latency time of at least one collision parameter is ascertained based on the common time base and on a time stamp that is output together with the at least one collision parameter, the at least one collision parameter is corrected based on the ascertained signal age and/or ascertained latency time, and the corrected parameter is output to at least one precrash function prior to an impact.