Vehicle Antitheft Using ABS Inertia Sensor
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Solution Overview
Problem
Conventional automotive antitheft systems with inclination sensors face challenges in detecting vehicle theft when the vehicle is jacked up with small accelerations, leading to decreased detection accuracy and potential false alarms from wind-induced movements.
Innovation Solution
An antitheft apparatus that utilizes an inertia sensor commonly used in anti-lock braking systems, combined with an electronic control unit and a warning device, to detect vehicle theft by analyzing acceleration and yaw rate signals, improving detection accuracy and reducing false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional inclination sensor with two detecting elements is installed to detect vehicle inclination in longitudinal and cross directions, then the vehicle can be protected against theft by jack-up, but the mounting space and business investment increase
Solution Approach 1:
The patent reuses the inertia sensor already installed in the vehicle for anti-lock braking system (ABS) purposes and applies it additionally for theft detection. This multi-functional use eliminates the need for a separate inclination sensor, reducing mounting space and component quantity while maintaining theft detection capability
Solution Approach 2:
The existing inertia sensor serves dual purposes: it performs its original ABS function and simultaneously provides theft detection functionality. The sensor essentially serves itself by providing additional value without requiring separate dedicated components
2Measurement precision
If detecting elements are arranged to detect accelerations in longitudinal and cross directions individually, then the system can detect vehicle inclination, but detection accuracy decreases when one detecting element deteriorates
Solution Approach 1:
The patent combines the output signals from multiple detecting elements through signal processing in the control unit. By merging and processing signals from both longitudinal and cross-direction detecting elements, the system calculates overall vehicle inclination and can compensate for deterioration in one element, maintaining detection accuracy
Solution Approach 2:
The control unit continuously processes and compares signals from multiple detecting elements, using feedback mechanisms to identify when one element deteriorates and adjusts calculations accordingly to maintain accurate inclination detection
3Device complexity
If the inertia sensor is commonly used in anti-lock braking system, then business investment and mounting space are reduced, but detection accuracy for small accelerations may be insufficient
Solution Approach 1:
The patent changes the processing parameters by applying specific signal processing techniques and threshold settings in the control unit to enhance the sensitivity of the existing inertia sensor for detecting small accelerations associated with theft events, rather than relying solely on the sensor's raw output
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 solution enhances detection accuracy for vehicle theft, particularly in cases of small accelerations, while minimizing business investment and space requirements for mounting, and reduces false alarms caused by wind-induced movements.
Implementation Method 1
an inertia sensor provided for an anti-lock braking system
Data Source
AI summary
An antitheft apparatus for a vehicle has an inertia sensor, which is also used for an anti-lock braking system. An electronic control unit receives output signals from the inertia sensor and determines a possible vehicle theft when a detected vehicle condition (for example, vehicle acceleration) is larger than a threshold value.