Hybrid Vehicle Terrain Mode Control via Battery SoC Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid electric vehicles face reduced fuel efficiency and degraded performance when driven in terrain modes, especially when the state of charge (SoC) of the battery is lowered, leading to inefficient battery charging and decreased driving capabilities.
Innovation Solution
A method and apparatus for controlling the terrain driving mode of a hybrid vehicle by calculating demand torque based on driver demand and road environment, differentiating torque profiles for various terrains, and determining the most efficient driving mode (EV or HEV) based on SoC and accumulated driving energy to maintain optimal battery state and enhance fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the vehicle is driven by an engine only to generate driving force for escape from hard road, then driving performance is improved, but fuel efficiency is degraded
Solution Approach 1:
The control apparatus dynamically switches between engine-only driving mode and hybrid driving mode based on real-time battery state of charge (SoC) levels. When SoC is above the threshold, the system uses engine-only mode for escape performance; when SoC drops below the threshold, it transitions to hybrid mode to recharge the battery, optimizing both performance and fuel efficiency throughout the driving cycle.
Solution Approach 2:
The system changes the operating parameters by adjusting the boundary condition between engine-only driving and hybrid driving based on battery SoC. The control apparatus monitors SoC continuously and changes the driving mode parameter accordingly, using engine-only mode when energy is sufficient and hybrid mode when energy needs replenishment, thereby resolving the contradiction between power output and fuel consumption.
2Use of energy by moving object
If the vehicle is driven in a hybrid mode, then fuel efficiency is improved, but SoC of battery is lowered to degrade driving performance
Solution Approach 1:
The control apparatus implements periodic switching between hybrid driving mode and engine-only mode. During periods when battery SoC is sufficient, the system operates in engine-only mode for maximum performance. When SoC decreases below the threshold during hybrid mode operation, the system periodically switches back to engine-only mode to recharge the battery, creating a cyclical pattern that maintains both fuel efficiency and driving performance over time.
3Reliability
If the vehicle enters a battery charging mode when stopped, then battery SoC is restored, but fuel efficiency is lowered and vehicle performance is degraded
Solution Approach 1:
The control apparatus performs preliminary action by proactively switching to engine-only driving mode when battery SoC approaches the threshold, rather than waiting for the battery to fully deplete. This preventive switching allows the battery to be recharged during subsequent engine operation, avoiding the need for dedicated battery charging mode when stopped, thereby maintaining fuel efficiency while ensuring battery reliability.
Data Source
AI summary
Disclosed herein is a method of controlling a terrain driving mode of a hybrid vehicle, including defining demand torque required for vehicle driving depending on driver demand and an environment of a driving road, differentiating demand torque in response to the terrain driving mode, calculating accumulated driving energy from a time point of an operation in the terrain driving mode based on the differentiated demand torque, and determining a terrain driving method based on the calculated accumulated driving energy and a state of energy (SoE) in consideration of a state of charge (SoC) and a voltage condition of a battery cell.