ECU Mode Signal Delay Filter for Rapid Power Saving Return
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Solution Overview
Problem
Existing electronic control units (ECUs) face difficulties in rapidly returning to a normal mode from a power saving mode, especially when a wake-up signal is input during preparation processing, leading to potential misinterpretation of mode signals due to noise or delayed signal detection.
Innovation Solution
The information processing apparatus employs a delay filter and an additional filter to delay mode signals, allowing the normal control unit to execute preparation processing without interrupting new mode signals, and a return unit to release the normal control unit's stop based on delayed signals indicating a return to the normal mode, ensuring rapid mode switching and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ECU executes preparation processing before shifting to power saving mode, then the mode transition is completed properly, but the ECU cannot detect wake-up signals during preparation processing
Solution Approach 1:
The system performs preparation processing in advance before transitioning to power saving mode. This preliminary action ensures that all necessary cleanup operations (terminating unused programs, releasing resources) are completed before the mode switch, preventing detection failures during the transition.
Solution Approach 2:
The patent introduces a flag mechanism as an intermediary to communicate wake-up signal status to the preparation processing thread. This flag allows the wake-up signal detection to be preserved even when the main ECU is busy with preparation processing, solving the detection problem during mode transition.
2Speed
If the ECU returns to normal mode immediately upon detecting a wake-up signal, then the response speed is fast, but erroneous mode shifts may occur due to noise
Solution Approach 1:
The system applies preliminary anti-action by using a delay filter and additional filter to preemptively counteract the harmful effect of noise. These filters delay the wake-up signal processing and require multiple detections within a specific time window, preventing erroneous mode shifts caused by noise while maintaining fast response to legitimate wake-up signals.
3Loss of time
If the delay time is longer than preparation processing time, then the ECU can return to normal mode rapidly, but the normal control unit must interrupt reception of new mode signals
Solution Approach 1:
The system dynamically adjusts signal reception behavior based on the operational state. During preparation processing, the normal control unit interrupts reception of new mode signals to avoid conflicts. This dynamic control ensures that delayed wake-up signals are processed correctly without causing erroneous mode shifts, while minimizing the impact on system responsiveness.
Data Source
AI summary
An information processing apparatus which operates in an operation mode as either of a first mode and a second mode in which power consumption is lower than power consumption in the first mode, includes: a normal control unit; a delay filter configured to delay a mode signal by a delay time longer than a time required for a preparation processing by the normal control unit; a power saving shift unit configured to stop the normal control unit after termination of the preparation processing in a case where the mode signal indicates shifting to the second mod; and a return unit to release stop of the normal control unit in a case where at least one of the mode signal and the mode signal delayed indicates returning to the first mode.