Dynamic SOC Indicator for Hybrid Vehicle Mode Switching
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Solution Overview
Problem
Existing SOC indicators for hybrid vehicles do not provide clear information on the timing of mode switching between EV and HV traveling modes, and struggle to intuitively convey SOC transitions within narrow SOC ranges, making it difficult for drivers to forecast mode changes.
Innovation Solution
An SOC indicator with a first indication unit that displays SOC changes within a predetermined range, featuring a movable index and fixed indices indicating switching thresholds between EV and HV modes, allowing for intuitive understanding of mode transitions and SOC state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the SOC indicator displays the full SOC range on a regular scale, then the entire battery capacity is represented, but minute fluctuations within narrow SOC ranges become difficult to grasp
Solution Approach 1:
The indicator dynamically adjusts its display range based on the current traveling mode. In EV mode, it expands to show the full SOC range from upper limit to lower limit. In HV mode, it contracts to show only the narrow SOC range relevant to that mode, making fluctuations visible and meaningful to the driver.
Solution Approach 2:
The indicator provides different display qualities for different operating conditions. For EV mode, it shows the complete SOC spectrum. For HV mode, it focuses on the specific narrow range where HV operation occurs, providing locally optimized information for each mode.
2Loss of information
If the SOC indicator uses a fixed display range, then the display structure is simple, but information on timing of mode switching is not provided
Solution Approach 1:
The indicator transitions from a static display to a dynamic one that automatically adjusts its visible range based on detected traveling mode. This provides mode switching information without requiring complex additional components, as the adjustment is triggered by the vehicle's existing mode detection system.
Solution Approach 2:
The same indicator unit serves multiple functions: it displays SOC for both EV and HV modes, provides mode switching timing information, and adapts its display range automatically. This multi-functionality is achieved through software control rather than additional hardware complexity.
3Measurement precision
If the SOC indicator shows minute fluctuations in narrow SOC range, then detailed SOC changes are visible, but the overall SOC range context is lost
Solution Approach 1:
The indicator automatically adapts its display characteristics based on the current traveling mode. When in EV mode, it shows the full SOC range. When in HV mode, it zooms in to show only the narrow SOC range relevant to HV operation, providing both detail and context as needed.
Solution Approach 2:
The display provides different levels of SOC detail appropriate to each operating mode. In EV mode, it shows the complete picture. In HV mode, it provides localized detailed view of the narrow SOC range where HV operation occurs, matching the information needs of each mode.
Data Source
AI summary
A state of charge indicator includes a first indication unit that provides an indicator display within a predetermined display range including first and second ends, according to an increase/decrease in a state of charge of a battery of a hybrid vehicle. In an EV traveling mode, the first indication unit allows the first and second ends to correspond respectively to an upper limit of a state of charge range directed to the EV traveling mode, and a first threshold that defines switching from the EV traveling mode to an HV traveling mode. In the HV traveling mode, the first indication unit allows the first and second ends to correspond respectively to a second threshold that defines switching from the HV traveling mode to the EV traveling mode, and a lower limit of a state of charge range directed to the HV traveling mode.