Vehicle Impact Detection Circuit With Time-Varying Thresholds
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Solution Overview
Problem
In electric vehicles, external impacts can generate high voltage/high current in secondary batteries, posing a risk of human injury. There is a need for an impact detection circuit that can distinguish various impact detection conditions and cut off the battery output to prevent injuries.
Innovation Solution
A vehicle impact detection device comprising an amplifier, a comparative voltage circuit, a comparator, and a driver. The device generates a reference signal that decreases over time, allowing the comparator to determine if predefined impact detection conditions are met, triggering the driver to cut off the battery output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of impact detection conditions are set to detect various impact types, then the detection capability and safety are improved, but the device complexity increases
Solution Approach 1:
A single comparator circuit is designed to evaluate multiple impact detection conditions by comparing the impact signal against multiple reference signals with different magnitudes. This allows one circuit to perform what would traditionally require multiple separate comparison circuits, reducing overall system complexity while maintaining comprehensive impact detection capability.
Solution Approach 2:
The reference signals are designed with different magnitudes to represent different impact thresholds. By varying the reference signal parameters (magnitude levels) rather than creating separate circuits for each threshold, the system achieves multi-condition detection with a unified comparator structure, simplifying the device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively detects external impacts by distinguishing different conditions and cutting off the battery output, thereby reducing the risk of human injury and preventing potential fires caused by battery impacts.
Implementation Method 1
an amplifier configured to receive and amplify an impact signal of a vehicle
Implementation Method 2
a first comparator configured to output a control signal indicating that a predetermined first impact detection condition or a predetermined second impact detection condition is satisfied, on the basis of an amplified signal output by the amplifier and the first reference signal
Data Source
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AI summary
A vehicle impact detection device includes: an amplifier configured to receive and amplify an impact signal of a vehicle; a comparative voltage circuit configured to generate a first reference signal; a first comparator configured to output a control signal indicating that a predetermined first impact detection condition or a predetermined second impact detection condition is satisfied, based on an amplified signal output by the amplifier and the first reference signal; and a driver configured to cut off an output of a battery on basis of the control signal, wherein the comparative voltage circuit is configured to reduce a magnitude of the first reference signal over time in response to detection of the amplified signal output by the amplifier.