EV Navigation Range Display With Air Conditioning Load
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Solution Overview
Problem
Electrically powered vehicles face challenges in balancing air conditioner operation with battery charge levels, leading to either reduced comfort or inability to reach destinations due to insufficient battery charge, with existing solutions either limiting air conditioner output or not accounting for reachable distances when air conditioning is used.
Innovation Solution
A navigation device that calculates the total electricity required for travel and air conditioning, displaying reachable locations and nearby charging spots when the battery charge is low, allowing users to select air conditioning modes that balance comfort and range, and clearly indicating charging spots on a map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air conditioner output is limited to enable the vehicle to reach its destination, then the vehicle can reach the destination with insufficient battery charge, but the comfort in the cabin is reduced
Solution Approach 1:
The navigation device provides real-time feedback to the user by displaying the reachable site based on current battery charge and air conditioning power consumption. This allows the user to adjust air conditioning settings according to the displayed range information, achieving a balance between comfort and the ability to reach the destination.
Solution Approach 2:
The system dynamically calculates and updates the reachable site information as the vehicle moves and battery charge changes. The navigation device continuously monitors battery charge levels and air conditioning power consumption to provide up-to-date range information, enabling flexible decision-making by the user.
2Ease of operation
If the air conditioner is enabled to operate according to the occupant's setting, then the comfort in the cabin is maintained, but the vehicle may not be able to reach the destination set in the navigation device due to insufficient remaining amount of electricity
Solution Approach 1:
The navigation device provides real-time feedback to the user by displaying the reachable site based on current battery charge and air conditioning power consumption. This allows the user to adjust air conditioning settings according to the displayed range information, achieving a balance between comfort and the ability to reach the destination.
Solution Approach 2:
The system calculates and displays the reachable site information in advance before the user completes their journey. This allows the user to plan ahead and make informed decisions about air conditioning usage and charging stops to ensure they can reach their destination.
3Loss of information
If the navigation device displays detailed reachable site information, then the user can make informed decisions about air conditioning usage, but the device complexity increases
Solution Approach 1:
The navigation device extracts and displays only the essential information needed for user decision-making: the reachable site based on current battery charge and air conditioning power consumption. By focusing on this key information rather than displaying all possible parameters, the system provides useful guidance while maintaining relatively simple device architecture.
Data Source
AI summary
A navigation device mounted on an electrically powered vehicle which includes a battery that supplies electricity to an electric motor and an air conditioner. The navigation device includes a controller. The controller is configured to obtain an electricity amount for traveling and an electricity amount for air conditioning, these electricity amounts are needed during travel from a current location to a destination specified by a user. The controller is configured to add the electricity amount for air conditioning to the electricity amount for traveling to obtain a total amount of electricity. When a remaining amount of electricity stored in the battery is less than the total amount of electricity, the controller operates a display to show a site where the vehicle is reachable with the remaining amount of electricity and is located between the current location and the destination, along with positional information on a charging spot around the site.