Hybrid Vehicle Mode Control for All-Electric Range Preservation
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Solution Overview
Problem
Plug-in hybrid electric vehicles (PHEVs) cannot take advantage of tax incentives, even if they can run fully electric, due to regulatory requirements that the range-extending engine activates under various conditions, leading to potential unnecessary emissions and reduced performance.
Innovation Solution
A system for controlling operational modes in a hybrid electric vehicle that allows the range-extending engine to turn on only when the all-electric range is less than a predetermined value, enabling the driver to select a hybrid mode to sustain charge and maintain electric-only operation, with indicators to notify the driver of range limits and performance adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the range-extending engine is allowed to operate under various conditions (high power demand, battery preservation, evaporative emissions purge, maintenance, extreme temperatures), then the vehicle can maintain performance and reliability, but the vehicle cannot qualify for electric vehicle tax incentives and emits unnecessary pollutants
Solution Approach 1:
The system changes the operational parameters by introducing a deliberate driver action requirement (moving the selector from neutral to hybrid mode) and a threshold condition (low-range indicator illumination at 15 km AER). This transforms the engine operation from automatic/continuous to conditional/on-demand, allowing the vehicle to meet EV incentive criteria while maintaining necessary engine functions for reliability and emissions management
Solution Approach 2:
The system implements dynamic mode switching between EV mode and hybrid mode based on real-time conditions (battery charge level, driver input, environmental factors). The control system continuously monitors AER and adjusts engine operation dynamically, enabling the vehicle to operate in pure EV mode for incentive qualification while transitioning to hybrid mode when reliability or emissions management requires engine operation
2Temperature
If the range-extending engine operates to provide heat and warm up the electric drive system in extreme temperatures, then the vehicle can operate reliably in extreme conditions, but the engine runs unnecessarily increasing emissions
Solution Approach 1:
The system performs preliminary heating or cooling of the electric drive system using the engine before the vehicle begins electric-only operation. By pre-warming the battery and motor in extreme cold or pre-cooling in extreme heat before EV mode engagement, the system ensures reliable EV operation without continuous engine running, thereby reducing unnecessary emissions while maintaining temperature requirements
3Adaptability or versatility
If the vehicle operates in hybrid mode to extend range and provide heat, then the vehicle utility and safety increase, but the all-electric range is reduced and performance is compromised
Solution Approach 1:
The system extracts and separates the engine operation from continuous vehicle operation, isolating it to specific hybrid mode conditions. By taking out the engine function and making it optional rather than integral to all operation, the vehicle maintains pure EV capability for incentive qualification while extracting engine assistance only when the driver deliberately selects hybrid mode for extended range or heating needs
Solution Approach 2:
The vehicle is designed with multi-functionality, capable of operating in both pure EV mode (for incentive qualification and low emissions) and hybrid mode (for extended range and extreme temperature operation). This universal design allows the same vehicle to serve multiple purposes: meeting regulatory criteria for EV incentives while providing hybrid capabilities when utility and range are prioritized by the driver
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
Meets regulatory criteria for electric vehicle incentives, optimizes performance, reduces pollutant emissions, and provides increased utility and safety by allowing the engine to extend the vehicle's range and provide heat, while minimizing unnecessary engine operation.
Implementation Method 1
a rechargeable energy storage device coupled to an electrical motor for powering the vehicle
Implementation Method 2
a range-extending engine coupled to a generator for powering the vehicle
Data Source
Figure 1~2
Figure 3
AI summary
A method of controlling operational modes of a hybrid electric vehicle includes: determining whether an all-electric range (AER) of the vehicle is at or less than a first predetermined value; activating a first operational mode if the AER is determined to be at or less than the first predetermined vehicle; determining, while the first operational mode is active, whether the AER of the vehicle is greater than a second predetermined value; activating a second operational mode if the AER is determined to be greater than the second predetermined vehicle.