Vehicle Fault Detection via Acceleration Gradient Monitoring
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Solution Overview
Problem
Current fault detection methods in electronically controlled drive systems of motor vehicles require excessive software and storage due to the need for intrinsic safety, leading to high application costs and complex programming, especially in engine control systems.
Innovation Solution
A method using an electronic control unit to detect faults by monitoring the accelerator pedal position and longitudinal acceleration, implementing fault detection programs that define acceleration gradients and thresholds based on empirical data to identify anomalies independently of the system's functional scope, reducing the need for extensive characteristic diagrams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intrinsic safety fault detection is implemented for each control unit and electronically controlled system, then system reliability is improved, but device complexity and application expenditures increase significantly
Solution Approach 1:
The patent merges fault detection functionality into a separate, centralized evaluation unit that independently monitors multiple control units and electronically controlled systems. This consolidation allows one fault detection program to serve multiple systems, reducing overall software complexity while maintaining comprehensive safety monitoring across the entire vehicle system.
Solution Approach 2:
The evaluation unit is designed with universal fault detection capabilities that can monitor various types of control units and systems using a standardized approach. By implementing a general-purpose fault detection mechanism that works across different systems, the patent reduces the need for system-specific fault detection software, thereby lowering overall complexity and application expenditures.
2Measurement precision
If fault detection thresholds are stored for each characteristic curve in characteristic diagrams, then measurement precision is improved, but storage requirements and programming expenditures double
Solution Approach 1:
The patent extracts the fault detection threshold values from the characteristic diagrams and stores them separately in a structured format. This separation allows the evaluation unit to access only the necessary threshold values without storing entire characteristic curves, significantly reducing storage requirements while maintaining the precision needed for accurate fault detection.
Solution Approach 2:
The patent changes the representation of fault detection parameters from storing complete characteristic curves to storing only the essential threshold values. This parameter transformation reduces the data volume from extensive graphical information to compact numerical values, decreasing storage space requirements while preserving measurement precision for fault detection.
3Adaptability or versatility
If extensive characteristic diagrams are used for functional programming, then system functionality is improved, but application expenditures and programming time increase
Solution Approach 1:
The patent segments the fault detection process from the functional control software, creating an independent evaluation unit. This segmentation allows functional programming to focus solely on system control while fault detection is handled separately, reducing the overall programming burden and improving development efficiency without compromising system functionality.
Data Source
AI summary
A method is provided for detecting faults in an electronically controlled drive system of a motor vehicle by way of an electronic control unit. The electronic control unit detects at least the accelerator pedal position and the longitudinal acceleration of the motor vehicle as input signals. The control unit is configured to carry out a first fault detection program independently of its actual functional scope, by which program, a fault is detected if a defined acceleration gradient, which is dependent on a change in the accelerator pedal position, is exceeded for longer than for a predefined time period.