Cascade Controller Calibration Using Single-Loop Mediator
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Solution Overview
Problem
Adjusting calibration parameters for cascade controllers is complex and expensive due to interdependence, leading to unexpected responses in vehicle guidance systems, whereas single-loop controllers have independent parameters, making adjustments less complex and less expensive.
Innovation Solution
A system and method that determine calibration parameters for cascade controllers based on those of single-loop controllers, using a relationship between types of controllers to minimize deviations in control inputs and responses, with a remote computer providing updated parameters to a vehicle computer for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration parameters for cascade controllers are adjusted directly, then control accuracy can be improved, but the complexity and cost of calibration increases significantly
Solution Approach 1:
The patent introduces an intermediary single-loop controller that serves as a mediator between the calibration process and the cascade controller. By calibrating the single-loop controller first (which has independent parameters), and then using its calibration parameters to determine the cascade controller parameters through a mathematical relationship, the complex direct calibration of interdependent cascade parameters is avoided. This intermediary approach simplifies the calibration process while maintaining control accuracy.
Solution Approach 2:
The patent applies preliminary action by performing calibration of the single-loop controller before calibrating the cascade controller. The single-loop controller is calibrated first to minimize the difference between its input and response, and this preliminary calibration result is then used as a basis for determining the cascade controller parameters. This sequential approach prevents the need for iterative adjustment of interdependent parameters.
2Measurement precision
If calibration parameters for cascade controllers are adjusted directly, then control accuracy can be improved, but the cost of calibration increases
Solution Approach 1:
The single-loop controller acts as an intermediary that reduces calibration cost. By using the simpler single-loop controller with independent parameters as a mediator, the expensive and complex direct calibration of cascade controllers is avoided. The mathematical relationship between the two controllers allows the cheaper single-loop calibration to inform the cascade controller calibration, reducing overall calibration cost.
Solution Approach 2:
The patent uses the single-loop controller as a simplified copy or model of the cascade controller for calibration purposes. The single-loop controller replicates the essential control function but with independent parameters that are easier and cheaper to calibrate. The calibration parameters from this 'copy' are then transferred to the actual cascade controller through a mathematical relationship, avoiding the need for expensive direct calibration.
3Reliability
If calibration parameters for cascade controllers are adjusted directly, then control response can be optimized, but unexpected effects on other controllers occur
Solution Approach 1:
The patent applies preliminary action by calibrating the single-loop controller first and using its results to determine cascade controller parameters. This sequential calibration ensures that parameters are set in a controlled manner, minimizing unexpected interactions. The mathematical relationship between the controllers provides a predictable transformation from single-loop to cascade parameters, reducing the likelihood of unexpected effects.
Solution Approach 2:
The calibration process uses feedback by minimizing the difference between the single-loop controller input and response to determine optimal calibration parameters. This feedback mechanism ensures that the calibration parameters are adjusted systematically to achieve desired control response without causing unexpected effects on other controllers, as the optimization process accounts for the overall system behavior.
Data Source
AI summary
Upon determining calibration parameters for a single-loop controller that minimize a difference between an input to the single-loop controller and a response from the single-loop controller, calibration parameters for a cascade controller are determined based on the determined calibration parameters for the single-loop controller. The cascade controller includes a secondary controller and a primary controller. The calibration parameters for the cascade controller are provided to a second computer in a vehicle.