Vehicle Sensor Signal Recovery for Control Accuracy
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Solution Overview
Problem
Vehicle subsystem sensors often exhibit slow dynamic responses, resulting in output signals with reduced magnitude and phase shifts relative to the input signals, which can lead to inaccurate control of vehicle subsystems.
Innovation Solution
A vehicle control system that includes a processor generating a recovered signal from the sensor output, using a product of the sensor's time constant and filtered changes over time, to align the magnitude and phase of the recovered signal with the original input signal, thereby improving control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a sensor with slow dynamic response is used to monitor vehicle subsystems, then the sensor can provide stable output signals, but the output signal magnitude is reduced and phase shifts occur relative to the input signal
Solution Approach 1:
The patent applies parameter changes by modifying the sensor output signal through mathematical transformation. A recovered signal is generated using the formula: recovered signal = sensor output signal + (time constant × derivative of sensor output signal). This parameter transformation compensates for the magnitude reduction and phase shift caused by the sensor's slow dynamic response, restoring the signal accuracy without affecting the inherent stability of the sensor.
2Device complexity
If the sensor output signal is used directly for control, then the control system is simple, but the control accuracy is reduced due to signal distortion
Solution Approach 1:
The patent introduces an intermediary component - the recovered signal generation module - that acts as a mediator between the sensor output and the control system. This module processes the distorted sensor signal through mathematical operations (adding the time constant multiplied by the derivative of the sensor output) to produce a corrected recovered signal, thereby improving control accuracy without significantly increasing overall system complexity.
Data Source
AI summary
A vehicle control system includes a processor programmed to control a vehicle subsystem according to a recovered signal generated from an output signal of a sensor, and a product of a time constant of the sensor and filtered changes of the output signal with respect to time such that a magnitude and phase of the recovered signal approach a magnitude and phase of an input signal to the sensor.