Wheel Speed Sensor Signal Handover Across ECU Switching
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Solution Overview
Problem
In vehicle systems with a single type wheel speed sensor (WSS) connected to a single ECU, there is a gap in signal reception during ECU switching, leading to potential control errors and discontinuity in wheel speed information, which is crucial for vehicle stability and braking systems.
Innovation Solution
A WSS signal-processing device with two ECUs, where the first ECU identifies and transmits control information to the second ECU, allowing seamless switching by using a power line with a switch and a data bus to ensure continuous signal processing, even during ECU state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single type WSS is connected to one ECU to reduce system complexity and cost, then device complexity is reduced, but signal continuity is lost during ECU switching
Solution Approach 1:
The first ECU identifies control information from the WSS detection signal and transmits it to the second ECU before the first ECU switches to inactive state. This preliminary transmission of control information ensures that the second ECU has the necessary data ready before taking over, preventing any signal gap during the ECU switching process
Solution Approach 2:
The first ECU acts as an intermediary by receiving the detection signal from the WSS, processing it to extract control information, and then transmitting this information to the second ECU. This intermediary role ensures seamless information transfer during the transition from active to inactive state, maintaining signal continuity without requiring dual WSS connections
2Reliability
If ECU switching is implemented to provide redundancy and improve reliability, then system reliability is improved, but control errors may occur due to signal gaps during switching
Solution Approach 1:
The first ECU performs preliminary identification of control information and transmits it to the second ECU before switching off. This ensures the second ECU receives complete and accurate control information in advance, eliminating the risk of control errors that would otherwise occur during the switching transition
Solution Approach 2:
The system implements a feedback mechanism where the first ECU monitors the detection signal, processes control information, and transmits it to the second ECU. This feedback loop ensures that the second ECU receives verified and accurate control information before taking over, preventing control errors during the redundancy switching process
3Reliability
If control information is transmitted from first ECU to second ECU before switching, then signal continuity is maintained, but data transmission overhead increases
Solution Approach 1:
The first ECU extracts only the essential control information from the detection signal before transmitting it to the second ECU. By taking out only the necessary control parameters rather than transmitting the entire detection signal or redundant data, the system maintains signal continuity while minimizing data transmission overhead and energy consumption
Data Source
AI summary
According to an embodiment of the present invention, there is provided a wheel speed sensor (WSS) signal-processing device according to ECU switching, the device comprising an ECU including a first ECU and a second ECU performing a control operation based on a detection signal received from the WSS, wherein the first ECU identifies control information based on the detection signal and transmits the control information to the second ECU, and wherein the second ECU identifies an event in which an operating state of the first ECU is switched from an active state to an inactive state, and performs the control operation according to the control information in a section in which an operating state of the second ECU is switched from the inactive state to the active state according to the event.