Inductive Load Control via Dynamic Filter Parameter Selection
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Solution Overview
Problem
Conventional inductive load controlling devices for automatic transmissions in vehicles face challenges in suppressing overshoot, undershoot, and ringing while achieving fast responsiveness to reach target current values, with existing solutions either failing to meet both requirements simultaneously or optimizing one at the expense of the other.
Innovation Solution
An inductive load controlling device featuring a target value filter with differential characteristics and a PI compensator, along with a parameter memory section and selection processing, which selects appropriate filter and compensation parameters based on detected conditions to control the load current effectively, thereby preventing overshoot, undershoot, and ringing, and ensuring quick response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional PWM control with fixed parameters is used, then the control structure is simple, but overshoot, undershoot, and ringing occur while failing to reach target current values quickly
Solution Approach 1:
The patent applies dynamics by making the filter parameters variable rather than fixed. The parameter selection processing section dynamically selects appropriate filter parameters from the parameter memory section based on detected selection conditions (such as current error magnitude and rate of change). This allows the control system to adapt its characteristics in real-time, achieving both fast responsiveness when needed and stable control when required, thereby resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent implements parameter changes by storing multiple sets of filter parameters in the parameter memory section, each optimized for different operating conditions. The parameter selection processing section changes the filter parameters based on the detected selection conditions, such as selecting different parameters for large versus small current errors. This enables the system to optimize performance for each specific condition, achieving both rapid response and stability without the overshoot and ringing problems of fixed-parameter systems.
2Reliability
If multiple filter parameters are stored and selected based on conditions, then responsiveness and stability are improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the control device to automatically select the appropriate filter parameters without external intervention. The parameter selection processing section autonomously detects the current operating conditions and selects the most suitable parameters from the parameter memory section based on pre-defined selection conditions. This self-adjusting capability improves control reliability while keeping the device structure relatively simple, as the system manages its own optimization without requiring complex external control mechanisms.
Data Source
AI summary
An inductive load controlling device in which a target current value is reached in a short time while suppressing overshoot, undershoot, and ringing, including a target value filter that receives a target current value of electric current to be supplied to the load and exhibits differential characteristics using a plurality of filter parameters; an inductive load controlling section that controls load current to be supplied to the load based on a filter output from the target value filter; a parameter memory section that stores parameters for the filter corresponding to a plurality of selection conditions; a selection condition detecting section that detects the selection conditions; and a parameter selection processing section that selects the filter parameters fitting to the selection condition out of the parameter memory section based on the selection condition detected by the selection condition detecting section and delivers the filter parameters to the filter.