Hybrid Engine Control for Warm-Up Diagnosis Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In hybrid vehicles, frequent automatic engine stop and start during travel can lead to insufficient execution frequency of engine abnormality diagnosis, which is required by regulations.
Innovation Solution
A hybrid vehicle system that includes an engine, a motor, and a control device with units for intermittent operation, feedback control, calculation, determination, and diagnosis, ensuring engine operation continuation during warm-up and executing abnormality diagnosis after completion of warm-up, with learning of control values to stabilize the engine state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine is frequently stopped and started during motor travel, then fuel efficiency is improved, but the execution frequency of engine abnormality diagnosis cannot be ensured
Solution Approach 1:
The control device determines whether to stop the engine based on predictions of future travel demands and battery charge/discharge requirements. By predicting future conditions and making stop decisions in advance, the system ensures that the engine remains running when needed for diagnosis execution, thereby maintaining both fuel efficiency and diagnosis frequency requirements
2Loss of energy
If the engine is stopped to improve fuel efficiency, then energy loss is reduced, but the engine cannot be warmed up properly affecting diagnosis accuracy
Solution Approach 1:
The control device checks whether the engine has completed warm-up before executing abnormality diagnosis. By performing this check in advance and delaying diagnosis until warm-up is complete, the system ensures accurate diagnosis results while still allowing for engine stop operations to improve fuel efficiency when appropriate
3Loss of substance
If the engine operation is controlled to stop during motor travel, then fuel consumption is reduced, but the execution timing of abnormality diagnosis becomes uncertain
Solution Approach 1:
The control device continuously monitors engine operating conditions, travel demand predictions, and battery charge/discharge requirements. This feedback mechanism allows the system to dynamically adjust engine stop decisions while ensuring that abnormality diagnosis is executed at appropriate times when the engine is running, thereby balancing fuel consumption reduction with timely diagnosis execution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures the execution frequency of engine abnormality diagnosis, avoids premature engine stop during diagnosis, and improves diagnosis accuracy by stabilizing the engine state through learning of control values.
Implementation Method 1
a feedback control unit configured to execute feedback control to control a control value of the engine such that an actual rotational speed of the engine becomes a target idle rotational speed
Data Source
AI summary
A hybrid vehicle includes an engine, a motor, and a control device configured to control the engine. The control device includes an intermittent operation control unit, a feedback control unit, a calculation unit, a determination unit, a continuation unit, and a diagnosis unit.