Engine RPM Control Apparatus for Load Prediction and Task Reliability

Solution Overview

Problem

High engine rpm leads to increased load on electronic control apparatus, resulting in task omissions due to shorter control cycles, which affects drivability and fuel efficiency.

Innovation Solution

Incorporating a load predicting part to forecast engine rpm load ahead of time and an engine rpm reducing part to lower engine speed if the predicted load exceeds a threshold, thereby preventing task omissions and maintaining optimal fuel economy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If engine rpm is increased to improve vehicle performance, then power output is improved, but control cycle becomes shorter and task omissions occur

Engineering Contradiction:

Improvepower outputVSAvoidtask execution reliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The control apparatus performs preliminary action by predicting future load on the electronic control apparatus before task omissions occur. The prediction unit forecasts the load based on current operating conditions, and when high load is predicted, the system proactively reduces engine rpm in advance to prevent task omissions, rather than waiting for actual task failures to occur.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If engine rpm is reduced to prevent task omissions, then task execution reliability is improved, but power output decreases

Engineering Contradiction:

Improvetask execution reliabilityVSAvoidpower output

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The control apparatus dynamically adjusts engine rpm based on predicted future load conditions rather than using a static control strategy. The system continuously monitors current load, predicts future load using the prediction unit, and adaptively changes engine rpm in real-time to maintain optimal balance between power output and task execution reliability under varying operating conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control apparatus performs preliminary action by predicting future load on the electronic control apparatus before task omissions occur. The prediction unit forecasts the load based on current operating conditions, and when high load is predicted, the system proactively reduces engine rpm in advance to prevent task omissions, rather than waiting for actual task failures to occur.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If task priority scheduling is used to ensure high priority tasks are executed, then task execution reliability for critical functions is improved, but low priority tasks are frequently omitted reducing drivability

Engineering Contradiction:

Improvecritical task execution reliabilityVSAvoiddrivability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The control apparatus performs preliminary action by predicting future load on the electronic control apparatus before task omissions occur. The prediction unit forecasts the load based on current operating conditions, and when high load is predicted, the system proactively reduces engine rpm in advance to prevent task omissions, rather than waiting for actual task failures to occur.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8731757B2Control apparatus and control system

Publication Date: 2014.05.20 TOYOTA JIDOSHA KK

AI summary

The present invention provides a control apparatus which includes a load predicting part configured to predict, based on current load information of an engine rpm controlling part, a load of the engine rpm controlling part at a time point which is a predetermined time ahead of the present time point, the engine rpm controlling part being configured to control an engine rpm; and an engine rpm reducing part configured to reduce the engine rpm if the load predicted by the load predicting part is greater than or equal to a first threshold.