Fuel Gauge Indication Stabilization via Variable Subtraction
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Solution Overview
Problem
Existing fuel gauge systems experience rapid fluctuations due to vehicle behavior and tank deformation, leading to discomfort for drivers, as they fail to accurately match the indication value with the detected fuel sender value, especially under stringent regulations that improve fuel tank airtightness and shape flexibility.
Innovation Solution
A remaining fuel amount display device with a fuel gauge, sensor, and electronic control unit that calculates an indication value by subtracting a variable subtraction value from the last indication value when it's greater than the detected value, and adjusts this value based on the difference between the last and detected values to ensure the gauge aligns closely with the sensor's readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the indication value of the fuel gauge is updated sequentially by subtracting fuel consumption amount from the detected value of the fuel sender, then rapid fluctuation of the indication value is suppressed, but a large difference accumulates between the indication value and the detected value when the fuel tank deforms due to internal pressure changes
Solution Approach 1:
The patent applies dynamics by making the correction coefficient variable rather than fixed. The correction coefficient is dynamically adjusted based on the difference between the indication value and the detected value, allowing the system to adapt to changing conditions such as fuel tank deformation. This enables the system to maintain stability while correcting for accumulated errors caused by tank deformation.
Solution Approach 2:
The patent implements feedback by continuously comparing the indication value with the detected value and using this difference to adjust the correction coefficient. This feedback mechanism allows the system to detect when a large difference has accumulated and automatically increase the correction amount, thereby resolving the contradiction between maintaining stability and ensuring accuracy.
2Measurement precision
If the correction coefficient is increased to reduce the difference between indication value and detected value quickly, then accuracy improves, but the indication value fluctuates rapidly causing driver discomfort
Solution Approach 1:
The patent applies dynamics by making the correction coefficient variable rather than fixed. The correction coefficient is dynamically adjusted based on the difference between the indication value and the detected value, allowing the system to adapt to changing conditions such as fuel tank deformation. This enables the system to maintain stability while correcting for accumulated errors caused by tank deformation.
Solution Approach 2:
The patent implements feedback by continuously comparing the indication value with the detected value and using this difference to adjust the correction coefficient. This feedback mechanism allows the system to detect when a large difference has accumulated and automatically increase the correction amount, thereby resolving the contradiction between maintaining stability and ensuring accuracy.
3Device complexity
If a fixed subtraction value is used to update the indication value, then the calculation is simple, but the indication value deviates significantly from the detected value when the fuel tank deforms
Solution Approach 1:
The patent applies dynamics by making the correction coefficient variable rather than fixed. The correction coefficient is dynamically adjusted based on the difference between the indication value and the detected value, allowing the system to adapt to changing conditions such as fuel tank deformation. This enables the system to maintain stability while correcting for accumulated errors caused by tank deformation.
Solution Approach 2:
The patent applies parameter changes by modifying the correction coefficient based on the difference between the indication value and the detected value. When the difference exceeds a threshold, the correction coefficient is increased to accelerate the convergence of the indication value toward the detected value. This dynamic parameter adjustment maintains calculation simplicity while improving accuracy.
Data Source
AI summary
A remaining fuel amount display device including: a fuel gauge; a sensor that detects the remaining fuel amount of the fuel tank; and an electronic control unit that calculates an indication value of the fuel gauge. The electrical control unit calculates the indication value by subtracting a subtraction value from a last indication value when the last indication value is greater than a detected value of the remaining fuel amount. The last indication value is calculated at one time before the indication value. The subtraction value is greater than a latest fuel consumption amount in an interval of the calculation of the indication value and equal to or less than a sum of the fuel consumption amount and a difference between the last indication value and the detected value. The subtraction value becomes larger when a value obtained by comparing the last indication value with the detected value is larger.