Hybrid Vehicle SOC Control Using Route-Based Driving Modes
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Solution Overview
Problem
Hybrid vehicles face inefficiencies in fuel consumption and battery charging/discharging due to suboptimal engine operating points, leading to deteriorated fuel efficiency and increased battery loss when SOC is not maintained appropriately.
Innovation Solution
An apparatus and method for controlling a hybrid vehicle that includes an engine, drive motor, battery, electric supercharger, navigation device, and controller to calculate optimal SOC and adjust driving modes based on torque requirements, minimizing battery charging and discharging losses by determining the most efficient operating points and modes (EV, engine single, normal HEV, and supercharged HEV modes) for each section of a driving path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is operated in the optimal operating point to charge the battery, then the battery SOC is maintained, but charging and discharging loss of the battery occurs
Solution Approach 1:
The navigation device calculates driving path information in advance, and the controller pre-determines optimal SOC for each section of the driving path before the vehicle actually travels. This allows the system to plan battery charging/discharging strategies ahead of time, avoiding frequent SOC adjustments that cause energy loss while ensuring SOC is maintained at appropriate levels for upcoming driving sections.
Solution Approach 2:
The controller dynamically adjusts the engine operating point and battery SOC targets based on real-time driving conditions and pre-calculated optimal SOC for each path section. The system transitions between different driving modes (EV mode, HEV mode, engine mode) dynamically, optimizing the balance between maintaining SOC and minimizing charging/discharging cycles.
2Loss of energy
If the engine cannot be operated in the optimal operating point due to lack of SOC, then charging can occur, but fuel efficiency deteriorates
Solution Approach 1:
The system pre-calculates optimal SOC for each section of the driving path using navigation information, allowing the controller to plan engine operation and battery charging/discharging strategies in advance. This ensures the engine operates at optimal points for fuel efficiency while anticipating future charging needs based on upcoming driving conditions.
Solution Approach 2:
The controller continuously monitors actual SOC levels and compares them with pre-determined optimal SOC values for each path section. Based on this feedback, the system adjusts engine operating points and driving modes in real-time, ensuring fuel efficiency is maintained while achieving necessary battery charging when SOC deviates from optimal levels.
3Reliability
If the engine is continuously operated in the optimal operating point, then SOC can be maintained, but charging and discharging loss increases
Solution Approach 1:
The navigation device and controller work together to pre-determine optimal SOC for each section of the driving path before the vehicle reaches that section. This allows the system to plan engine operation strategies in advance, maintaining SOC at appropriate levels without requiring continuous charging/discharging cycles, thereby reducing battery loss while ensuring SOC maintenance.
Solution Approach 2:
The controller changes the target SOC parameter dynamically based on the specific driving path section and upcoming driving conditions. Instead of maintaining a fixed SOC level, the system adjusts optimal SOC targets according to pre-calculated path information, reducing unnecessary charging/discharging cycles while ensuring SOC remains appropriate for each driving section.
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
This solution allows for the minimization of battery charging and discharging losses by maintaining optimal SOC levels, enhancing fuel efficiency and reducing battery wear, thereby improving overall vehicle performance.
Implementation Method 1
a drive motor, configured to assist the power of the engine and to selectively operate as a generator to generate electrical energy
Implementation Method 2
a battery configured to supply electrical energy to the drive motor or to be charged by the electrical energy generated by the drive motor
Implementation Method 3
an electric supercharger configured to be installed in an intake line in which an intake air supplied to a combustion chamber of the engine flows
Data Source
AI summary
An apparatus for controlling a hybrid vehicle includes an engine; a drive motor; a battery; an electric supercharger configured to be installed in an intake line in which an intake air supplied to a combustion chamber of the engine flows; a navigation device configure to calculate a driving path from a starting point to a destination point and driving information; a controller configure to calculate a driving load from the driving path and the driving information calculated by the navigation device, determine an optimal SOC (state of charge) for each section from the starting point to destination point based on the driving load, determine a driving mode of the vehicle based on a required torque of driver and a driving mode of the battery to follow the optimal SOC for each section, and adjust an operating point of the engine.