Hybrid Vehicle HSG Idle Charging Control for Terrain Mode
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Solution Overview
Problem
Hybrid vehicles face challenges in managing battery state of charge (SOC) effectively during terrain mode, where the battery performance is affected differently compared to general road driving, requiring specific control methods to optimize SOC for optimal driving conditions in off-road scenarios.
Innovation Solution
A hybrid vehicle system that includes a hybrid starter generator (HSG) for idle charging, a controller to adjust SOC based on user inputs and terrain mode conditions, and sensors to detect acceleration pedal displacement, vehicle speed, and road slope, allowing the vehicle to switch between EV and HEV modes and adjust engine operating points to maintain a higher SOC in terrain mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle enters terrain mode with low battery SOC, then the vehicle can operate in EV mode for smooth driving, but the battery may become depleted before reaching the destination
Solution Approach 1:
The system performs preliminary action by detecting terrain mode entry and proactively switching to HEV mode before battery depletion occurs. The controller monitors SOC levels and terrain conditions, then preemptively engages the engine to generate power, preventing the harmful outcome of battery exhaustion while maintaining smooth EV-like operation.
2Power
If the vehicle enters terrain mode with high battery SOC, then the vehicle can provide maximum driving force, but the battery may become overcharged
Solution Approach 1:
The system implements feedback control by continuously monitoring battery SOC levels and adjusting power management strategies accordingly. When SOC reaches high thresholds during terrain mode, the controller provides feedback to switch from HEV to EV mode, preventing overcharging while maintaining optimal driving force. This closed-loop control ensures battery protection while maximizing power delivery.
3Quantity of substance
If the vehicle operates in HEV mode during terrain mode, then the battery SOC can be maintained, but the vehicle consumes more fuel
Solution Approach 1:
The system applies dynamics by making the power mode flexible and adaptive rather than fixed. The controller dynamically switches between EV and HEV modes based on real-time SOC levels, terrain conditions, and driving requirements. This dynamic adjustment allows the vehicle to minimize fuel consumption by operating in EV mode when possible while maintaining battery health through selective HEV operation, optimizing the trade-off between fuel efficiency and battery management.
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
The system ensures a sufficient SOC level is maintained in terrain mode, enhancing driving force and responsiveness, particularly in off-road conditions by optimizing battery charging and engine operation based on terrain-specific inputs.
Implementation Method 1
a hybrid starter generator (HSG) connected to the engine to operate as a start motor to turn on the engine, and configured to operate as a generator that performs idle charging when the engine is turned on
Data Source
AI summary
A hybrid vehicle is provided and includes an input that receives user selection for terrain mode and a HSG connected to the engine to operate as a start motor to turn on the engine. The HSG operates as a generator that performs idle charging when the engine is turned on. A battery is electrically connected to the HSG. A controller configured perform idle charging when SOC of the battery is less than or equal to a first SOC through the HSG by turning on the engine.