Vehicle Display Device for Electric Vehicles
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Solution Overview
Problem
Existing vehicle display devices for electric vehicles do not effectively encourage drivers to perform driving operations that improve energy efficiency during both motor travel and vehicle braking, which are crucial for reducing electricity and fuel costs.
Innovation Solution
A vehicle display device that includes a loss energy calculation module, consumption calculation module, first and second efficiency calculation modules, and a display control module to calculate and display energy efficiency differences, encouraging drivers to optimize their driving operations by showing the ECO gauge on the onboard display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a vehicle display device displays only fuel cost information, then fuel cost efficiency is improved, but energy efficiency during motor travel and braking is not effectively encouraged
Solution Approach 1:
The patent segments energy efficiency information into two distinct time periods: a first period (longer duration) and a second period (shorter duration). This segmentation allows the display device to show both average energy efficiency over a longer period and instantaneous energy efficiency over a shorter period, providing comprehensive feedback to encourage energy-efficient driving and braking operations.
Solution Approach 2:
The patent implements a feedback mechanism by calculating and displaying the difference between first energy efficiency (average over longer period) and second energy efficiency (instantaneous over shorter period). This efficiency difference provides real-time feedback to the driver, encouraging adjustments in driving and braking operations to improve overall energy efficiency.
2Loss of energy
If the display shows average energy efficiency over a long period, then overall energy consumption is reduced, but immediate driving behavior feedback is insufficient
Solution Approach 1:
The patent divides the feedback time scale into two segments: a first period for calculating average energy efficiency (longer duration) and a second period for calculating instantaneous energy efficiency (shorter duration). This dual-timescale segmentation provides both long-term energy consumption trends and short-term immediate feedback, enabling drivers to understand overall performance while receiving timely guidance for immediate operational adjustments.
Solution Approach 2:
The patent employs periodic calculation of energy efficiency at different time scales. The first energy efficiency is calculated periodically over a longer first period, while the second energy efficiency is calculated periodically over a shorter second period. This periodic multi-scale calculation ensures continuous feedback at appropriate intervals for both strategic and tactical driving decisions.
3Force
If friction brake actuation is increased for better stopping performance, then braking effectiveness is improved, but energy loss increases
Solution Approach 1:
The patent calculates loss energy based on the actuation state of the friction brake and incorporates this into the energy efficiency calculation. By displaying the efficiency difference that reflects friction brake usage, the system provides feedback to drivers, encouraging them to reduce friction brake actuation when possible to improve energy efficiency while maintaining necessary braking performance.
Solution Approach 2:
The patent changes the parameter being monitored from simple fuel cost to comprehensive energy efficiency that includes loss energy from friction brake actuation. This parameter change allows the display to reflect the energy impact of braking decisions, enabling drivers to make more energy-efficient braking choices without compromising safety.
Data Source
AI summary
A vehicle display device is provided in an electric vehicle including a friction brake and includes: a loss energy calculation module that calculates a loss energy released from the electric vehicle on the basis of an actuation state of the friction brake; a consumption calculation module that calculates an energy consumption consumed by the electric vehicle on the basis of the loss energy; a first efficiency calculation module that calculates a first energy efficiency on the basis of a travel distance and an energy consumption in a first period; a second efficiency calculation module that calculates a second energy efficiency on the basis of a travel distance and an energy consumption in a second period shorter than the first period; and a display control module that controls a display content of an onboard display on the basis of an efficiency difference between the first and second energy efficiencies.