Vehicle Presence Detection Reference Level Saving
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Solution Overview
Problem
Existing presence detection devices for motor vehicles, such as those using capacitance or light flux, are jammed by low-frequency signals, preventing the detection of objects like hands after the emission of these signals, leading to failed detection of hand presence.
Innovation Solution
A detection device that saves a reference level of physical quantity before low-frequency signal emission and compares it post-emission to detect object presence, inhibiting measuring means during signal emission to prevent interference and allowing continued detection of hand presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the detection device continuously monitors physical quantity to detect object presence, then detection responsiveness is improved, but the reference level varies due to environmental factors and measurements
Solution Approach 1:
The system performs preliminary action by saving a stable reference level value before environmental variations or measurements occur. This saved reference level remains fixed and is not modified by subsequent measurements or environmental changes, ensuring measurement precision is maintained while allowing continuous detection operation.
Solution Approach 2:
The system applies dynamics by making the reference level adaptive - it can be updated when no object is present to track environmental changes, but is frozen/suspended when an object is detected or during signal emission. This dynamic behavior allows the reference level to respond to environmental variations while maintaining stability during critical detection periods.
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
Enables reliable detection of hand presence after low-frequency signal emission, preventing false negatives and maintaining detection functionality during signal transmission.
Implementation Method 1
the device uses a detection member such as, for example, a set of electrodes, the physical quantity associated with said set being, for example, a capacitance. In this case, an object such as a hand may be detected by this set of electrodes when the capacitance between the set of electrodes varies.
Implementation Method 2
the low-frequency antenna which, following the detection of presence of an object sends a low-frequency signal toward an identification object held by the user to check the identity of said identification object. The latter then sends radiofrequency signal toward the antenna in order to be authenticated.
Data Source
AI summary
The invention relates to a device for detecting (CAPT) the presence of an object, that comprises at least one detection member (EA, EB) to which is associated a physical value that varies based on the environment in which said detection member (EA, EB) is located. The invention is characterised in that the physical value provides a variable reference level corresponding to the absence of an object and in that it further comprises a saving device (LOG IC) for saving, upon the emission of a low-frequency signal, a value of the reference level measured before the emission of said low-frequency signal.