Sensor Signal Inverse Modeling for Faster Engine Response
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Solution Overview
Problem
Internal combustion engine sensors, such as temperature, oxygen, and nitrous oxide sensors, exhibit slow response times, leading to delayed information delivery to controllers, which can result in inaccurate control algorithms and noise amplification when attempting to accelerate their response using existing methods.
Innovation Solution
A method that involves operating sensor signals with an inverse model and a desired sensor model to yield an accelerated output, using first-order equations and optional signal processing for noise attenuation, allowing for faster and more accurate environmental attribute assessment without introducing unwanted noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If sensor response time is accelerated using prior art methods, then response speed is improved, but noise is amplified resulting in inaccurate readings
Solution Approach 1:
The patent introduces an intermediary processing system between the sensor and controller that uses a mathematical model to predict the true environmental attribute. The inverse model acts as a mediator that transforms the slow sensor response into an accelerated output without directly amplifying the raw sensor signal, thereby avoiding noise amplification while achieving faster response.
Solution Approach 2:
The patent changes the parameter representation by transforming the sensor output through an inverse model that accounts for the sensor's dynamic characteristics. By modeling the sensor as a first-order system and applying the inverse transfer function, the system transforms the slow response parameter into an accelerated estimate of the true environmental attribute without amplifying measurement noise.
2Loss of time
If sensor response time is reduced, then control responsiveness is improved, but the sensor cannot accurately reflect historical conditions
Solution Approach 1:
The patent applies preliminary action by using the inverse model to predict what the true environmental attribute should be based on the sensor's known dynamic characteristics. The system proactively compensates for the sensor's slow response by calculating the estimated true value in advance, allowing the controller to respond immediately without waiting for the sensor to catch up.
Solution Approach 2:
The patent implements feedback by using the modeled sensor behavior to continuously adjust the estimated true environmental attribute. The inverse model incorporates the sensor's dynamic characteristics and uses this feedback mechanism to refine the acceleration calculation, ensuring that the accelerated output accurately reflects both current and historical conditions.
Data Source
AI summary
A sensor response time acceleration method including the steps of reading a signal step and an operating on the signal step. The reading a signal step includes reading a signal from a sensor, the signal representative of an environmental attribute as detected by the sensor. The operation on the signal step includes operating on the signal with a function of an inverse model of the sensor and a function representative of a desired sensor model to yield an accelerated output representative of the environmental attribute.