Hybrid EV Priority Display for Battery and Output Thresholds
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Solution Overview
Problem
Existing systems fail to support continued EV driving in hybrid vehicles by prioritizing electric vehicle (EV) mode over engine mode, leading to unnecessary engine activation even when the battery has sufficient capacity, thus limiting EV driving distance.
Innovation Solution
A support system for hybrid vehicles that allows selection of an EV priority mode, incorporating devices for state-of-charge detection, requested output detection, and a display system with segments indicating battery state and output capacity, guiding users to prioritize regenerative braking over brake pedal operation to maintain EV driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the EV priority mode is selected to prioritize motor driving with the internal combustion engine stopped, then the EV driving distance can be extended, but the engine must start when the state-of-charge falls below the charge threshold or the requested output exceeds the output threshold, interrupting continued EV driving
Solution Approach 1:
The system performs preliminary actions by displaying the number of charging lights and output lights before the engine actually starts. The charging lights indicate the state-of-charge level, and the output lights indicate the difference between requested output and available motor output. This advance information allows the user to adjust their driving behavior (avoid sudden accelerator operations, prioritize regenerative braking) to prevent engine start, thus extending EV driving distance while maintaining reliability
Solution Approach 2:
The system implements feedback by continuously monitoring the state-of-charge and requested output, and displaying the corresponding charging lights and output lights to the user. This feedback loop enables the user to understand the current battery status and adjust their driving operations accordingly, allowing continued EV driving even when approaching threshold values that would normally trigger engine start
2Device complexity
If only the state-of-charge is displayed using traditional segment lighting, then the display structure is simple, but it cannot provide sufficient information to support continued EV driving when the requested output is high
Solution Approach 1:
The display information is segmented into two distinct components: charging lights that display the state-of-charge level, and output lights that display the difference between requested output and available motor output. This segmentation allows the system to maintain a relatively simple display structure while providing comprehensive information about both battery status and output capacity, enabling users to make informed decisions to support continued EV driving
Data Source
AI summary
A display control device for a support system includes a number-of-charging-lights determination unit for determining the number of charging lights, which corresponds to state-of-charge which ranges from maximum state-of-charge of a driving battery to a charge threshold and is assigned to a plurality of segments; a number-of-output-lights determination unit for determining the number of output lights, which corresponds to a difference, where a requested output ranging from an output that can be output to an output threshold is assigned to the plurality of segments; and a number-of-lights instruction unit for instructing a display device to light up the least number of segments of the number of charging lights or the number of output lights, when an EV priority mode is selected.