Hybrid Engine Idle Priority Control Logic
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Solution Overview
Problem
Frequent forced shifting of an internal combustion engine to an idle state in hybrid vehicles can lead to degradation of fuel efficiency, as existing methods do not adequately ensure opportunities for Idle Speed Control (ISC) learning and air-fuel ratio learning, potentially compromising learning accuracy and fuel efficiency.
Innovation Solution
A control device and method that detects vehicle states and prohibits idle priority control if automatic stop control is prohibited, ensuring the engine is not frequently shifted to an idle state, thereby preventing fuel efficiency degradation by allowing the engine to operate continuously when automatic stop control is not permitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If idle priority control is executed frequently to ensure ISC learning opportunities, then learning accuracy is improved, but fuel efficiency deteriorates
Solution Approach 1:
The control device changes the operational parameters of the internal combustion engine by switching between automatic stop control and idle priority control based on vehicle state parameters. When automatic stop control is permitted, the engine is stopped during vehicle stops; when prohibited, the engine is maintained in idle state. This parameter-based control strategy ensures learning opportunities are provided only when fuel efficiency is not compromised.
2Loss of energy
If automatic stop control is executed to improve fuel efficiency, then fuel efficiency is improved, but learning opportunities are reduced
Solution Approach 1:
The control system dynamically adjusts the engine operation strategy based on real-time vehicle conditions. The control device transitions between two operational modes: automatic stop control mode (for fuel efficiency) and idle priority control mode (for learning opportunities). This dynamic adaptation allows the system to optimize fuel efficiency during normal operation while ensuring learning opportunities are captured when the vehicle state permits.
3Measurement precision
If the engine is maintained in operation to provide learning opportunities, then learning accuracy is improved, but fuel efficiency deteriorates
Solution Approach 1:
The control device performs preliminary assessment of vehicle state parameters (such as battery charge state, vehicle speed, and temperature conditions) to determine whether maintaining engine operation for learning purposes is feasible. By evaluating these parameters in advance, the system can proactively provide learning opportunities when conditions are favorable, rather than waiting until learning is needed and fuel efficiency is already compromised.
Data Source
AI summary
An ECU executes a program including a step (S102) of prohibiting idle priority control if automatic stop control of an engine is prohibited (YES in S100), and a step (S104) of permitting the idle priority control if the automatic stop control of the engine is not prohibited (NO in S100).