Driver Selection Rapid Heating Control for PHEV Defrosting
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Solution Overview
Problem
Plug-in hybrid electric vehicles (PHEVs) face challenges in rapid heating during low temperatures, leading to reduced drivability, torque instability, noise, and vibration, while also limiting the EV mode selection, which affects battery charging and windshield defrosting performance, thereby compromising driver visibility and safety.
Innovation Solution
A driver selection type rapid heating control method is implemented, utilizing a hybrid electric vehicle (HEV) button to control engine idling and a positive temperature coefficient (PTC) heater, allowing for mode changes to minimize fuel consumption and maintain EV mode advantages, ensuring rapid windshield glass defrosting by monitoring cooling water temperature and adjusting engine and PTC heater operations based on driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If engine idling and PTC heater operation are performed for rapid heating during EV mode, then heating performance is improved, but fuel consumption increases and battery charge depletes
Solution Approach 1:
The system dynamically switches between EV mode with engine idling and HEV mode with engine driving based on driver selection and temperature conditions. The controller adjusts operating modes in real-time to balance heating performance with fuel consumption, allowing the vehicle to transition from static EV mode to dynamic HEV mode when rapid heating is required.
Solution Approach 2:
The system changes operational parameters by switching between different driving modes (EV mode and HEV mode) and adjusting engine operating states (idling vs. driving). This parameter change allows the vehicle to optimize the balance between heating efficiency and fuel consumption based on real-time conditions and driver preferences.
2Temperature
If engine idling is performed for heating control, then heating performance is improved, but torque instability, noise and vibration occur
Solution Approach 1:
The system provides dynamic mode selection allowing drivers to switch between EV mode (with engine idling) and HEV mode (with engine driving). When drivers prioritize comfort, the system can transition to HEV mode where the engine operates in a more stable driving state, reducing noise and vibration while maintaining heating capability.
Solution Approach 2:
Instead of forcing engine idling for heating control, the system inverts the approach by allowing engine driving mode to perform heating. This reversal eliminates the torque instability and excessive noise/vibration associated with idling, as the engine operates in its optimal driving range while still providing necessary heat through the PTC heater.
3Use of energy by moving object
If EV mode is maintained during heating control, then battery charge is preserved, but windshield defrosting speed is reduced
Solution Approach 1:
The system dynamically adjusts between EV mode and HEV mode based on heating requirements. When rapid windshield defrosting is needed, the system transitions to HEV mode with engine driving, which provides faster heating capability. When defrosting urgency is low, the system maintains EV mode to preserve battery charge, creating a dynamic balance between energy conservation and defrosting speed.
Solution Approach 2:
The controller acts as an intermediary that manages the transition between EV mode and HEV mode based on heating demands. It mediates between the conflicting requirements of battery charge preservation and rapid defrosting by selectively activating engine driving only when necessary for fast defrosting, while relying on PTC heater during less critical periods.
4Temperature
If PTC heater and engine idling are used for heating control at low temperatures, then heating capability is improved, but EV mode conversion is prevented, affecting CD mode driving distance
Solution Approach 1:
The system dynamically switches between EV mode and HEV mode based on temperature conditions and driver selection. At low temperatures, the system can transition to HEV mode with engine driving, which provides superior heating capability while allowing controlled use of battery charge. This dynamic switching enables the vehicle to maintain longer CD mode driving distance by only using engine power when absolutely necessary for heating.
Solution Approach 2:
The system changes operational parameters by switching driving modes and adjusting engine states based on temperature thresholds. This parameter change allows optimal allocation of battery charge, using engine driving only when heating demands exceed what the PTC heater can provide alone, thereby extending CD mode driving distance while maintaining adequate heating capability.
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 method enables rapid heating with minimal fuel consumption and battery usage, improving drivability and safety by maintaining EV mode advantages, reducing fuel consumption by 28.5% and extending battery life, while allowing drivers to select between air conditioning and fuel efficiency during heating.
Implementation Method 1
a heating control of −13° C. or greater using the idling of the engine and a low voltage PTC heater
Implementation Method 2
detecting a cooling water temperature based on the driving of the engine
Data Source
AI summary
A driver selection type rapid heating control method is provided. In an eco-vehicle, when an off signal of a hybrid electric vehicle (HEV) input pressed by a driver is received in response to detecting a heating signal while being driven in an electric vehicle mode (EV mode), the rapid heating is performed by an idling of an engine and an operation of a positive temperature coefficient (PTC) heater. When an on signal of the HEV input is detected, rapid heating is performed by a driving of an engine and the operation of the PTC heater. Thus, the rapid heating is performed with minimal fuel consumption against battery consumption under conversion into the EV mode, in particular, rapid windshield glass defrosting is performed for securing a field of view while driving by the driver selection.