Vehicular CPU Clock Switching for Noise-Stable High-Speed Startup

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Solution Overview

Problem

Vehicular devices face challenges in achieving high performance without being affected by noise, particularly when using variable CPUs, as the fluctuating operating clock can impact noise-sensitive functional units, making ideal noise design difficult and prone to malfunctions such as voice deterioration and communication errors.

Innovation Solution

A vehicular device with a CPU that can be set to a rated state or a high speed state, where the CPU operates at a predetermined clock higher than the rated clock initially and switches to the rated state after a predetermined period, allowing for high performance without noise interference and reducing the complexity of noise design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a variable CPU is used to increase processing capacity, then productivity is improved, but noise-sensitive functional units are affected causing reliability to deteriorate

Engineering Contradiction:

Improveprocessing capacityVSAvoidnoise-related malfunctions

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The CPU operates in two dynamic states: a high-speed state for maximum processing capacity and a rated state for stable operation. The system dynamically switches between these states based on operational needs, allowing the CPU to be fast when needed and stable when noise sensitivity is a concern.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The CPU alternates between high-speed operation periods and rated operation periods. During activation, the CPU operates at high speed for a predetermined period to handle startup tasks, then transitions to the rated state for stable, noise-free operation during normal functionality.

Inventive Principle:

Principle #19Periodic action

2Productivity

If the CPU operates at high speed continuously, then productivity is improved, but noise impact on functional units increases causing reliability to worsen

Engineering Contradiction:

Improveprocessing capacityVSAvoidnoise impact

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system implements periodic high-speed operation followed by rated operation. The CPU operates at high speed only during a predetermined period after activation, then transitions to the rated state, creating a periodic pattern that limits noise exposure while maintaining productivity during critical startup phases.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Different operational qualities are applied at different times: high-speed quality during startup/activation periods and rated-quality during normal operation periods. This temporal local quality ensures high performance when needed while minimizing noise impact during sensitivity periods.

Inventive Principle:

Principle #3Local quality

3Reliability

If noise design is made ideal for all operating clocks, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvenoise resistanceVSAvoidnoise design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the noise problem by limiting high-speed operation to specific periods only. Instead of designing for all possible operating conditions, the system removes the need for complex noise design across all clocks by confining high-speed operation to predetermined periods after activation, where noise impact is acceptable.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system changes the operational parameter (CPU clock speed) based on time/condition. By operating at high speed only during predetermined periods and at rated speed during normal operation, the patent simplifies noise design while maintaining reliability through parameter variation rather than complex design across all parameters.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If the CPU operates at rated state continuously, then reliability is improved, but productivity decreases

Engineering Contradiction:

Improvenoise stabilityVSAvoidprocessing capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system uses periodic action in reverse: instead of periodic high-speed operation, it implements continuous rated operation with periodic high-speed bursts during activation. This ensures reliability during normal operation while providing productivity boosts during critical startup periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The CPU performs preliminary high-speed operation during the predetermined period after activation to handle startup tasks and initialization. This preliminary high-speed action completes time-critical tasks before transitioning to stable rated operation, ensuring both productivity during setup and reliability during normal use.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11755059B2System for setting an operating clock of a CPU of a vehicular device

Publication Date: 2023.09.12 DENSO CORP

AI summary

A vehicular device includes a CPU. The CPU is set in a rated state in which the CPU operates at a rated operating clock and a high speed state in which the CPU operates at an operating clock higher than the rated operating clock. The high speed state is changeable in the operating clock and the rated state is not changeable in the rated operating clock.