Chassis Damage Detection via Acceleration Threshold Validation
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Solution Overview
Problem
Chassis damage in vehicles often goes undetected, especially in shared or rental vehicles, due to lack of inspection, leading to reduced vehicle handling, steerability, and brakeability, and is difficult to discern with drive-by-wire, steer-by-wire, and brake-by-wire systems.
Innovation Solution
A vehicle system comprising accelerometers and a controller that detects and validates potential chassis damage by analyzing acceleration data between specific thresholds and outputs a notification to the driver, using a network for communication and supplemental restraint system integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drive-by-wire, steer-by-wire and brake-by-wire systems are implemented, then vehicle control precision is improved, but driver's ability to detect chassis damage deteriorates
Solution Approach 1:
The patent introduces accelerometers and a controller as intermediary components between the drive-by-wire system and the driver. The sensors detect chassis acceleration and the controller analyzes the data to identify potential damage, serving as a mediator that compensates for the driver's reduced ability to detect damage through the electronic control systems.
Solution Approach 2:
The patent replaces the mechanical feedback system (where the driver directly feels chassis vibrations and impacts) with an electronic sensing and notification system. Accelerometers electronically detect chassis acceleration events and the controller processes this data to notify the driver, substituting the direct mechanical connection with an electronic information pathway.
2Ease of operation
If vehicle inspection procedures are eliminated or simplified for shared vehicles, then ease of operation is improved, but reliability deteriorates
Solution Approach 1:
The patent enables the vehicle to self-monitor its own chassis health through integrated accelerometers and a controller. The system automatically detects, validates, and records potential chassis damage events, allowing the vehicle to self-report its condition during hand-off between users without requiring manual inspection procedures.
Solution Approach 2:
The patent implements a feedback system where the controller continuously monitors accelerometer data and provides real-time information about chassis condition. The system validates potential damage signals by analyzing acceleration patterns and provides feedback to the driver through notifications, creating a closed-loop system that maintains reliability without manual inspection.
3Ease of operation
If acceleration threshold for supplemental restraint triggering is used as detection criterion, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent uses a two-stage detection approach where the supplemental restraint acceleration threshold serves as a preliminary screening criterion (partial action). The controller then applies additional validation logic that analyzes the acceleration signal characteristics, duration, and pattern to confirm actual chassis damage, applying excessive action to ensure accurate identification while maintaining operational simplicity.
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 system effectively notifies drivers of potential chassis damage, improving vehicle safety and handling by providing timely alerts even when damage is not discernible, and ensuring that rental vehicles are inspected before use.
Implementation Method 1
a controller in communication with the sprung-mass accelerometer and the unsprung-mass accelerometer
Data Source
AI summary
A vehicle has one or more accelerometers for detecting acceleration of a chassis component. One or more separate sensors are also provided in the vehicle. A controller is programmed to receive a signal indicating acceleration from the one or more accelerometers, wherein the acceleration is between a lower threshold that indicates normal vehicle operation and an upper threshold which would otherwise set off restraint devices, such as airbags for example. When the acceleration is between the thresholds, a potential-chassis-damage signal can be locally created or sent. The controller then validates the potential-chassis-damage signal based on the signals received from the separate sensors. Upon validation, the controller outputs a message to a display, such as a display screen inside the vehicle or an OBD diagnostic tool, warning a user of potential-chassis damage.