In-Vehicle ECU Scheduling for Waveform Analysis Gaps

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Solution Overview

Problem

Conventional diesel engine control systems experience delays and task disablement due to repeated delays in waveform analysis processing, which can lead to improper internal combustion engine control and affect low-priority processing execution.

Innovation Solution

An in-vehicle electronic control unit is designed with an acquisition part, waveform analysis processing part, and control part that manages the execution of waveform analysis processing to allow for the activation of low-priority processing by delaying high-priority tasks and utilizing an adjustment processing part to ensure completion of waveform analysis before proceeding, thereby preventing continuous disablement of low-priority tasks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If waveform analysis processing is executed repeatedly without delay, then measurement precision of injection rate is improved, but low priority processing is delayed or disabled

Engineering Contradiction:

Improveinjection rate detection precisionVSAvoidlow priority processing execution

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent implements periodic action by introducing a predetermined wait period between waveform analysis processing executions. The control unit executes waveform analysis processing at specific intervals rather than continuously, allowing low priority processing to execute during the wait period. This periodic execution pattern resolves the contradiction by maintaining measurement precision through regular sampling while enabling other processing tasks to run during the intervals.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies dynamics by making the processing execution flexible and adaptive. The control unit dynamically adjusts between executing waveform analysis processing and allowing low priority processing based on system conditions and timing. This dynamic scheduling allows the system to switch between different processing priorities, ensuring both measurement precision and overall system productivity are maintained.

Inventive Principle:

Principle #15Dynamics

2Productivity

If waveform analysis processing is delayed repeatedly, then low priority processing can execute, but measurement precision and response time deteriorate

Engineering Contradiction:

Improvelow priority processing executionVSAvoidinjection rate detection precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent resolves this contradiction by establishing a periodic execution pattern where waveform analysis processing is performed at predetermined intervals rather than being continuously delayed. This ensures that measurement precision is maintained through regular sampling while low priority processing can execute during the intervals between waveform analysis executions.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent maintains continuity of useful action by ensuring that waveform analysis processing executes regularly at predetermined intervals, preventing excessive delays that would degrade measurement precision. Meanwhile, low priority processing continues to execute during the intervals, ensuring overall system productivity is maintained without sacrificing the continuity of critical measurement functions.

Inventive Principle:

Principle #20Continuity of useful action

3Measurement precision

If waveform analysis processing is executed in succession, then measurement precision is improved, but task delay or task disablement occurs

Engineering Contradiction:

Improveoperation characteristic determination precisionVSAvoidtask execution timing

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies periodic action by inserting predetermined wait periods between successive waveform analysis processing executions. This prevents continuous succession of processing tasks, allowing time for other tasks to execute and avoiding task delay or disablement. The periodic pattern maintains measurement precision through regular sampling while preventing task scheduling problems.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses preliminary action by proactively introducing wait periods before waveform analysis processing execution. This preliminary timing adjustment ensures that processing tasks are scheduled in advance with adequate spacing, preventing task overlap and disablement while maintaining regular measurement intervals for precision.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10648886B2In-vehicle electronic control unit

Publication Date: 2020.05.12 DENSO CORP

AI summary

In adjustment processing executed at the same period as waveform analysis processing, a CPU of a microcomputer permits an execution of the waveform analysis processing on condition that the waveform analysis processing has been completed. Thus a period of non-execution of the waveform analysis processing is ensured between a completion of preceding waveform analysis processing to an execution of next waveform analysis processing. Since low priority processing, which has been disabled to be executed, is enabled to be executed, it is possible to stop continuation of disablement of execution of the low priority processing.