Inertial Sensor Offset Compensation via Acceleration Braking Comparison
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Solution Overview
Problem
Existing methods for estimating a vehicle's mass are affected by offsets in longitudinal acceleration sensors, which can lead to significant deviations in mass estimation and impact systems like hill start aids, and current offset compensation methods fail to account for changing load distributions and temperature variations.
Innovation Solution
A method that determines the additive displacement of a longitudinal acceleration signal by analyzing the balance of forces during acceleration and braking processes, using a displaceably supported inertial sensor, and compensates for disturbances such as asymmetrical loading and temperature effects, without requiring vehicle standstill, using a driving dynamics control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an acceleration sensor is used to measure longitudinal acceleration during vehicle operation, then the mass of the vehicle can be estimated, but an offset or additive displacement in the sensor signal causes significant deviation between actual and estimated masses
Solution Approach 1:
The patent applies feedback by continuously monitoring the acceleration sensor signal during both acceleration and braking processes, comparing the measured values with expected physical relationships, and automatically calculating a compensation value to correct the offset. This closed-loop approach ensures continuous refinement of the mass estimation accuracy without manual intervention.
Solution Approach 2:
The patent changes the operational parameters by utilizing different driving conditions (acceleration vs. braking) to extract offset information. By analyzing the sensor behavior under contrasting conditions where the true acceleration can be inferred from vehicle dynamics, the system identifies and compensates for the offset parameter, thereby improving measurement precision.
2Adaptability or versatility
If the sensor installation is inclined or temperature changes occur, then the sensor becomes more adaptable to various installation conditions and environments, but this causes fluctuating or time-varying offsets in the acceleration signal
Solution Approach 1:
The system performs self-diagnosis and self-correction by automatically detecting offsets caused by installation inclination or temperature variations. Through continuous monitoring during normal operation (both acceleration and braking), the system identifies its own measurement errors and applies compensation without requiring external calibration equipment or manual adjustment, thereby maintaining precision despite environmental adaptability.
Solution Approach 2:
The patent prepares for potential offset issues by continuously calculating compensation values during normal vehicle operation before critical mass estimation is performed. The system proactively identifies and corrects offsets during routine acceleration and braking events, ensuring that accurate measurements are ready when needed for mass calculation or hill start aid functions.
3Device complexity
If offset compensation is performed only during vehicle standstill or using limited driving conditions, then the compensation method is simple to implement, but it cannot adequately compensate for offsets caused by asymmetrical loading or changing temperature conditions during operation
Solution Approach 1:
The patent implements continuous offset compensation by utilizing every available acceleration and braking event during vehicle operation. Rather than performing compensation only at specific moments (like standstill), the system continuously gathers data from all driving conditions, continuously refines the offset calculation, and maintains up-to-date compensation values, ensuring accuracy under varying load and temperature conditions throughout the vehicle's operational life.
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
This approach significantly increases the accuracy of mass estimation by continuously detecting and compensating for disturbance effects, ensuring accurate mass calculation regardless of road gradient and transmission type, and maintaining reliable operation in varying driving conditions.
Implementation Method 1
The inertial sensor with a displaceably supported test mass can in particular be implemented in the form of a microelectromechanical system
Data Source
AI summary
A method of providing an additive offset of a longitudinal acceleration signal of a traveling motor vehicle. The signal being measured by an inertial sensor is ascertained. At least the longitudinal acceleration signal, a braking signal, and a drive signal are detected. A force balance of the longitudinal dynamic of the motor vehicle is analyzed. The signals are detected both during at least one acceleration process as well as during at least one braking process. The signals during the acceleration processes are detected and/or analyzed separately from the signals during the braking processes, and the additive offset is ascertained by comparing the signals detected during the acceleration processes or the values calculated therefrom with the signals detected during the braking processes or the values calculated therefrom. The invention further relates to an electronic controller.