ADC Reference Signal Error Detection in Motor Steering Control
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Solution Overview
Problem
Motor driven power steering systems in vehicles face challenges in detecting errors in reference signals of analog-to-digital converters, which can lead to erroneous steering operations and potential accidents due to the lack of effective error detection and control mechanisms.
Innovation Solution
An electronic device comprising a microcontroller unit (MCU) and a power management integrated circuit (PMIC) that generates a digital signal to determine error rates in the reference signal of an analog-to-digital converter (ADC), entering a safe mode to limit motor driven power steering system functions when error rates exceed a reference threshold, utilizing resistors to adjust voltage and compare digital signals with stored values for error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error detection mechanism is added to ADC reference signal, then system safety is improved, but device complexity increases
Solution Approach 1:
The system uses its own existing resources (MCU, ADC, PMIC, and internal resistors) to perform self-diagnosis of the reference signal. The MCU generates a test voltage, converts it to digital via ADC, and compares the result with expected values to detect errors, eliminating the need for external dedicated error detection hardware.
Solution Approach 2:
Existing components are made multi-functional: the MCU not only controls the power steering system but also performs error detection; the ADC not only converts sensor signals but also converts test voltages for error detection; the resistors not only provide voltage division but also enable test signal generation. This reduces overall system complexity while improving safety.
2Reliability
If safe mode limiting is implemented when error rate exceeds threshold, then accident prevention is improved, but system functionality is reduced
Solution Approach 1:
The system dynamically adjusts its operational mode based on detected error rates. When error rates are low, the system operates in full functionality mode. When error rates exceed the threshold, the system transitions to safe mode with limited functionality, and can return to full mode when errors are corrected, providing adaptive response to system conditions.
Solution Approach 2:
The system prepares a safe mode in advance that can be activated when errors occur. By having the safe mode pre-configured with limited but safe functionality, the system can immediately respond to errors without causing accidents, while still maintaining some operational capability for safe vehicle operation.
Data Source
AI summary
An electronic device may include: a power management integrated circuit (PMIC); and a micro controller unit (MCU) electrically connected to the PMIC. The MCU may be configured to: generate, based on a first driving power signal output from the PMIC to drive the MCU, a digital signal for determining an error in a reference signal of an analog-to-digital converter (ADC) included in the MCU; identify an error rate of the digital signal; and determine a mode for controlling a motor driven power steering system, based on the error rate of the digital signal.