Hybrid Engine Speed Control During Warm-Up for Fuel Economy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hybrid vehicle control methods deteriorate fuel consumption performance during engine warming up by operating the engine at inefficient operating points.
Innovation Solution
A hybrid vehicle control method that operates the engine at a higher engine rotation speed when fuel consumption devices that improve fuel efficiency are not active, switching to the optimal fuel consumption line (α line) even during engine warming up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the engine operates at an operating point with poor efficiency to promote warming up, then the engine warming up is promoted, but fuel consumption performance deteriorates
Solution Approach 1:
The patent dynamically adjusts engine rotation speed based on the operating state of fuel consumption devices. When these devices are not operating, the engine runs at a higher rotation speed to generate heat for warming up. When the devices are active, the engine switches to optimal fuel consumption operating points. This dynamic adaptation resolves the contradiction by allowing efficient operation when possible while ensuring warming up when necessary.
Solution Approach 2:
The patent changes the engine rotation speed parameter according to whether fuel consumption devices are operating. By adjusting this key parameter, the system optimizes the balance between warming up requirements and fuel consumption performance, resolving the technical contradiction between these two opposing objectives.
2Temperature
If the engine operates at a higher rotation speed during warming up, then the engine warming up is promoted, but fuel consumption performance deteriorates
Solution Approach 1:
The system dynamically adjusts engine rotation speed based on real-time operating conditions. When fuel consumption devices are not operating, higher rotation speed is maintained for warming up. When devices are active, the system transitions to optimal fuel consumption operating points, thus dynamically resolving the contradiction between warming up and fuel consumption performance.
Solution Approach 2:
The patent performs preliminary warming up at higher rotation speeds only when necessary (when fuel consumption devices are not operating). Once the warming up requirement is satisfied or when devices become available, the system immediately switches to optimal fuel consumption operation, minimizing the duration of inefficient operation.
Data Source
AI summary
A hybrid vehicle control method for a hybrid vehicle having a drive motor, a battery supplying electric power to the drive motor, and an engine for power generation configured to supply electric power to the battery and the drive motor includes operating the engine at a higher engine rotation speed in an operating state in which a fuel consumption device that contributes to improved fuel consumption performance does not operate than in an operating state in which the fuel consumption device operates.