Hybrid EV Engine Start-Stop Control for Event-Priority Balancing
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Solution Overview
Problem
Hybrid electric vehicles face challenges in efficiently managing engine start-stop operations to balance fuel consumption, protect batteries, and enhance passenger comfort, particularly in varying conditions such as low temperatures and driver demands.
Innovation Solution
An engine start-stop control method that classifies and grades events, determining the appropriate level of engine start-stop control based on parameters like battery state, driver demand, and environmental conditions to optimize engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is stopped to reduce fuel consumption, then fuel efficiency is improved, but driver comfort and vehicle responsiveness deteriorate
Solution Approach 1:
The patent segments engine start-stop control into multiple event types (energy management events, driving behavior events, engine state events, external controller events) with different priority levels. This segmentation allows the system to selectively stop the engine only during low-priority situations while maintaining operation during high-priority situations, thus balancing fuel consumption with driver comfort.
2Use of energy by moving object
If the engine is stopped frequently to save fuel, then fuel economy is improved, but battery protection and system reliability worsen
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring battery state of charge (SOC), engine operating conditions, and vehicle state. The control system uses this feedback to determine whether engine stop conditions are appropriate, preventing stops that would harm the battery or compromise system reliability while still achieving fuel savings during safe stop conditions.
3Device complexity
If engine start-stop control is simplified to improve responsiveness, then system complexity is reduced, but adaptability to different conditions deteriorates
Solution Approach 1:
The patent employs dynamic event level adjustment where the priority level of different start-stop events can change based on current vehicle conditions. For example, energy management events have different levels depending on battery SOC, and driving behavior events have different levels depending on vehicle speed and load. This dynamic approach allows the system to adapt to varying conditions without requiring an overly complex static control structure.
Data Source
AI summary
An engine start-stop control method and device for a hybrid electric vehicle, and a hybrid electric vehicle belong to the technical field of vehicles. The method includes: obtaining a target parameter or a target signal, which is engine start-stop related, of the hybrid electric vehicle; determining, according to the target parameter or target signal, whether an engine start-stop related event occurs; if so, determining a level of the engine start-stop related event; and performing engine start-stop control according to the engine start-stop related event and the level thereof; wherein the engine start-stop related event includes at least one of the following: an energy management related start-stop event, a driving behavior related start-stop event, an engine state related start-stop event, an external controller request start-stop event, and other condition related start-stop events. The operating efficiency of the vehicle and the user experience are improved.