In-Vehicle Controller Voltage Abnormality Detection
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Solution Overview
Problem
Existing in-vehicle mount electronic controllers lack comprehensive detection of abnormality in plural output voltages, leading to potential operational failures due to inadequate precision and lack of precise abnormality prediction.
Innovation Solution
An in-vehicle mount electronic controller with a microprocessor, combination control circuit unit, and power supply abnormality detecting circuit that uses negative feedback control and a reference voltage generating circuit to detect individual and comprehensive abnormalities in output voltages, employing a judgment signal input circuit and individual abnormality detecting section to assess relative voltage information and report or store abnormality occurrence information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant-voltage power supply source generates multiple stabilized output voltages using conventional detection methods, then the power supply can operate with simple detection circuits, but the abnormality detection precision and comprehensiveness deteriorate
Solution Approach 1:
The detection function is segmented into multiple independent comparison circuits, each dedicated to detecting a specific output voltage. Each comparison circuit compares its designated output voltage against a corresponding comparison reference voltage, enabling precise individual detection without requiring a complex centralized detection system. This segmentation allows each circuit to be simple while the overall system achieves comprehensive detection capability.
Solution Approach 2:
The detection system is designed with multi-functionality to handle various detection needs simultaneously. The same basic comparison circuit structure can detect different output voltages (5V, 3.3V, 2.7V) by simply changing the comparison reference voltage, making the detection system universal and adaptable to multiple voltage levels without requiring fundamentally different circuit designs for each voltage.
2Reliability
If comprehensive abnormality detection for all output voltages is implemented, then operational reliability improves, but the device complexity and processing requirements increase
Solution Approach 1:
The comprehensive detection system is divided into independent comparison circuits for each output voltage (5V, 3.3V, 2.7V). Each circuit independently monitors its designated voltage without interfering with others, allowing the system to achieve comprehensive coverage while maintaining simple individual circuit designs. The segmentation enables parallel operation of multiple detection functions.
Solution Approach 2:
Each comparison circuit provides feedback signals indicating whether its monitored output voltage is within acceptable ranges. These feedback signals are processed to determine overall system health status, enabling the controller to respond appropriately to detected abnormalities. The feedback mechanism allows reliable operation monitoring without requiring complex continuous analysis of all voltages simultaneously.
3Device complexity
If only average voltage values are used for comparison, then the detection circuit is simple, but the ability to detect comprehensive abnormality and predict failures deteriorates
Solution Approach 1:
Instead of using a single average voltage comparison, the system segments the detection into multiple independent comparisons, each monitoring a specific output voltage against its own reference. This segmentation enables detection of abnormalities in individual voltage rails that would be masked when using only an average value, improving failure prediction capability while keeping each comparison circuit simple.
Solution Approach 2:
The system performs preliminary detection of voltage abnormalities before they can cause operational failures. By continuously monitoring each output voltage against predetermined reference values, the system can identify and respond to developing problems early, preventing catastrophic failures. This preliminary action approach enhances reliability without requiring complex real-time analysis.
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
Accurate detection of output voltage abnormalities allows for predictive maintenance and prevents operational failures by identifying individual and comprehensive abnormality states, facilitating timely maintenance checks and risk prediction.
Implementation Method 1
a reference voltage generating circuit for generating a reference voltage from the power supply voltage
Implementation Method 2
the respective constant-voltage power supply circuits being subjected to negative feedback control so as to be proportional to a reference voltage
Data Source
AI summary
In an in-vehicle mount electronic controller, a constant-voltage power supply generates a high-precision small-capacity 5V output voltage Vad, a low-precision large-capacity 5V output voltage Vif and a low-precision large-capacity 3.3V output voltage Vcp, and also generates at least one of a low-precision small-capacity 2.8V output voltage Vup and a high-precision small-capacity 3.3V output voltage Vsb. A judgment signal input circuit logically combines comparison results of divided voltages of the above output voltages Vif, Vcp, Vup and Vsb with a divided voltage of the output voltage Vad as a reference voltage, and inputs relative voltage information ER2, ER3, ER4 and ER5 to a microprocessor. The microprocessor comprehensively judges the output voltages containing the comparison reference voltage, and reports abnormality or saves abnormality occurrence information.