Vehicle Display Controller Baseline Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display controllers for vehicle fuel economy fail to quickly and accurately display performance values in the early stages of vehicle use, leading to large fluctuations due to small sample sizes, which can mislead drivers about their fuel-efficient driving habits.
Innovation Solution
A display controller that includes a first calculator for measuring vehicle performance, a second calculator for calculating fuel economy performance relative to a baseline value, a memory for storing initial and driver-specific fuel economy values, and an updater to replace oldest values, allowing for immediate calculation and display of fuel economy performance after the first trip, using initial values to stabilize baseline calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the baseline fuel economy is calculated by averaging all previous trips immediately, then the fuel economy performance value can be displayed quickly after the first trip, but the baseline value fluctuates significantly due to small sample size
Solution Approach 1:
The system pre-calculates and stores baseline fuel economy values during factory testing before the vehicle is delivered to the customer. These preliminary baseline values are stored in memory and used immediately when the customer first uses the vehicle, eliminating the need to wait for multiple trips to accumulate sufficient data for accurate baseline calculation.
Solution Approach 2:
The system cushions against the problem of small sample size by preparing multiple pre-calculated baseline values from extensive factory testing. These pre-prepared baseline values serve as a buffer that prevents significant fluctuations in the displayed performance metrics during the early stages of customer use, until sufficient customer trip data accumulates to establish a reliable customer-specific baseline.
2Productivity
If the baseline value is calculated from a small number of trips, then the performance value can be displayed earlier, but the displayed trends may be misleading due to large fluctuations
Solution Approach 1:
The system performs preliminary baseline calculations during factory testing and stores multiple baseline values in memory. When the customer first uses the vehicle, these pre-calculated baselines are immediately available for comparison, enabling instant performance feedback without relying on a small number of initial customer trips that would produce unreliable trends.
Solution Approach 2:
The system implements a feedback mechanism that compares customer-specific fuel economy against both the immediate baseline and historical baseline trends. This feedback approach allows the system to provide reliable performance indications even in early usage stages by referencing the stability of pre-established baselines, and gradually transitions to using customer-specific baselines as sufficient data accumulates.
3Measurement precision
If multiple baseline values are stored and managed, then the system can provide more accurate and stable performance indicators, but the device complexity increases
Solution Approach 1:
The system segments baseline management into distinct categories: factory-established baselines stored in memory, customer-specific baselines calculated from customer trips, and historical baseline records. Each segment serves a specific purpose and is managed independently, allowing the system to provide accurate measurements without creating an unmanageably complex monolithic baseline system.
Solution Approach 2:
The system automatically manages multiple baseline values through programmed algorithms that handle baseline selection, comparison, and updating without requiring manual intervention. The control unit automatically determines which baseline to use based on the number of customer trips completed, and automatically updates baselines as sufficient data accumulates, reducing the operational complexity despite managing multiple baseline values.
Data Source
AI summary
A display controller calculates a driver-related fuel economy value and a performance value indicating an amount of difference between the calculated driver-related fuel economy value and a baseline value. The display controller displays the performance value on a display device during vehicle operation. A memory in the vehicle stores a number of initial fuel economy values that are replaced by the driver-related fuel economy values as new driver-related fuel economy values are calculated. An oldest fuel mileage value stored in the memory is replaced with a newly calculated fuel mileage. The baseline value used to calculate the performance value is an average of the number of the fuel economy values stored in the memory.