Circuit Arrangement for Real-Time Signal Chain Diagnostics
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Solution Overview
Problem
Current electronic systems, such as those in automotive systems, face challenges in diagnosing signal chains quickly enough during operation to react to failures in real time, as diagnostics are typically performed infrequently and only during startup or predefined intervals, leading to inadequate or missed error detection.
Innovation Solution
A circuit arrangement comprising a receiver, a discharge circuit to provide a discharge pulse for capacitance discharge, and a modulation circuit to modulate a bit pattern onto the discharge pulse, enabling continuous and real-time testing of the signal chain during operation by generating test signals during intervals with no sensor data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diagnostics are performed only during startup or predefined intervals, then device complexity is reduced, but reliability of error detection deteriorates
Solution Approach 1:
The system uses the existing discharge circuit and capacitance, which are already part of the sensor interface, to generate test signals for self-diagnosis. The discharge circuit naturally charges and discharges the capacitance during normal operation, and this same circuit is utilized to inject test signals into the signal chain, eliminating the need for separate diagnostic hardware.
Solution Approach 2:
The discharge circuit serves dual purposes: it performs its original function of discharging the capacitance during normal sensor operation, and simultaneously generates test signals for diagnostic purposes. This multi-functionality allows continuous monitoring without adding dedicated diagnostic components.
2Reliability
If continuous testing is implemented during operation, then reliability of error detection is improved, but loss of time for data transmission increases
Solution Approach 1:
Test signals are injected periodically during the charging phase of the capacitance, which occurs in intervals between sensor data transmissions. The system alternates between receiving sensor data and performing diagnostic tests, utilizing the natural periodic charging-discharging cycle of the capacitance to schedule diagnostics without interfering with continuous sensor monitoring.
Solution Approach 2:
The test signals are generated and injected during the charging interval before the actual sensor data transmission begins. By performing diagnostics in advance during the capacitance charging phase, the system ensures that the signal chain is verified before critical sensor data is transmitted, without delaying the data transmission itself.
3Reliability
If diagnostic intervals are increased for faster reaction to failures, then reliability is improved, but productivity of data transmission decreases
Solution Approach 1:
The diagnostic testing operates continuously during the capacitance charging intervals, which are naturally occurring gaps in the sensor data transmission cycle. This continuous testing approach ensures that the signal chain is constantly monitored without interrupting or reducing the overall data transmission productivity, as diagnostics and data transmission occur in parallel time slots.
Data Source
AI summary
A circuit arrangement is provided, the circuit arrangement including a receiver configured to receive signal information from a sensor circuit; a discharge circuit configured to discharge a capacitance by providing a discharge pulse; and a modulation circuit configured to modulate a bit pattern onto the discharge pulse.