Dual Breathalyzer Override for Rail Vehicle Start Authorization
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Solution Overview
Problem
Existing vehicle security systems with on-board breathalyzers can produce false positives, leading to unnecessary vehicle blocking, and there is a need to prevent such false positives to ensure reliable vehicle operation.
Innovation Solution
Incorporating an external breathalyzer that can override the on-board breathalyzer in case of a fault, requiring two successive positive tests from the on-board breathalyzer and one negative test from the external breathalyzer to authorize vehicle start, along with driver identification and predetermined test intervals to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual breathalyzer verification is implemented, then false positives are prevented, but device complexity increases
Solution Approach 1:
The system dynamically activates the external breathalyzer only when needed - specifically when the on-board breathalyzer produces a positive result. This dynamic approach means the external device serves as a backup verification tool rather than a continuously active component, reducing the perceived complexity during normal operation while maintaining high reliability when faults occur.
Data Source
Figure 1
AI summary
The safety system (10) includes at least one on-board breathalyzer (16) connected to a vehicle (12) control center (18) to condition the vehicle (12) to start upon a passing breathalyzer test result. The control center (18) authorizes the vehicle (12) to start when a breathalyzer test is negative and prevents it from starting when the breathalyzer test is positive. The safety system (10) includes at least one external breathalyzer (24), and the control center (18) includes means (26) for authorizing the vehicle (12) to start when two successive breathalyzer tests are positive, but a breathalyzer test performed by the external breathalyzer (24) is negative.