Hybrid Vehicle Driving Control for Fuel Efficiency
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Solution Overview
Problem
Hybrid electric vehicles often degrade fuel efficiency by prematurely switching from EV mode to HEV mode during high-load driving periods due to insufficient battery charge, as they maintain a low state of charge to prevent system protection, leading to inefficient energy management.
Innovation Solution
A driving mode control method that calculates average driving loads for current and forward links, determining a minimum required state of charge and adjusting the mode switch reference based on driving power and maximum SoC reduction rates to ensure sufficient charge before entering high-load sections, thereby optimizing energy use and maintaining efficient EV mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vehicle travels in EV mode until SoC reaches minimum maintenance SoC, then the vehicle can operate in electric mode for extended periods, but fuel efficiency degrades when high-load driving periods occur
Solution Approach 1:
The control method performs preliminary action by determining the minimum required SoC in advance based on the driving load of the forward link before the vehicle enters high-load sections. This allows the system to proactively manage battery charge levels to ensure sufficient energy is available when needed, preventing premature mode switches and maintaining fuel efficiency.
Solution Approach 2:
The invention applies dynamics by making the mode switch reference dynamic rather than fixed. The minimum maintenance SoC is adjusted based on real-time conditions including the driving load of upcoming links, current SoC, and maximum EV driving power, allowing the system to adapt between maintaining low SoC for fuel efficiency and ensuring sufficient charge for reliability.
2Reliability
If the vehicle switches to HEV mode to charge the battery and ensure predetermined SoC, then system reliability is maintained, but fuel efficiency is degraded
Solution Approach 1:
The system performs preliminary action by calculating the minimum required SoC based on forecasted driving loads before the vehicle enters high-load sections. This allows the vehicle to maintain sufficient charge levels proactively through efficient EV mode operation in low-load sections, reducing the need for frequent HEV mode switches and engine operation for charging.
Solution Approach 2:
The invention implements feedback by continuously monitoring the relationship between current SoC, maximum EV driving power, and minimum required SoC. This feedback mechanism allows the system to dynamically adjust the mode switch reference, switching to HEV mode only when necessary to maintain the minimum required SoC, thereby optimizing the balance between reliability and fuel efficiency.
3Use of energy by moving object
If the vehicle maintains low SoC to prevent system protection, then fuel efficiency is improved, but the vehicle cannot handle high-load driving periods
Solution Approach 1:
The control method applies preliminary action by determining the minimum required SoC in advance based on the driving load characteristics of the forward link. This allows the system to maintain low SoC during low-load EV mode operation for fuel efficiency while ensuring sufficient power availability is prepared before entering high-load sections.
Solution Approach 2:
The invention uses dynamics by making the minimum maintenance SoC a dynamic parameter that adjusts based on upcoming driving conditions. When high driving load is detected in the forward link, the minimum required SoC increases, allowing the system to maintain low SoC for fuel efficiency in normal conditions while ensuring adequate power availability when high load is anticipated.
Data Source
AI summary
A driving control method of a hybrid vehicle is provided. The method includes acquiring link information on each of a current link in which the vehicle currently travels in an electric vehicle (EV) mode and a forward link connected to the current link ahead of the current link. A first average driving load of the current line and a second average driving load of the forward link are calculated based on the acquired link information. When the second average driving load is greater than the first average driving load a minimum required state of charge (SoC) based on the second average driving load and a preset driving mode switch reference are determined.