Vehicle Throttle Control Stabilizing Phase Lead Compensator Noise
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Solution Overview
Problem
Existing vehicle control systems with phase lead compensators become unstable due to noise, particularly during moderate transient operational periods, leading to hunting of the target throttle opening degree, which results in unnecessary operations, deteriorated fuel consumption, electronic throttle system durability, and drivability.
Innovation Solution
A control apparatus that includes a phase lead compensator and a noise filter positioned between the phase lead compensator and the control subject, where the filter is applied only to the output side to stabilize the system, reducing response delay and maintaining good response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a noise filter is applied to the input of the control system to achieve stability, then the system becomes stable in steady operational period, but the response is delayed due to phase lag compensation from multiple filters
Solution Approach 1:
The patent extracts the noise filtering function from the input side and relocates it to the output side of the control system. Specifically, the noise filter is applied to the target throttle opening degree after phase lead compensation, rather than to the target cylinder air charge quantity at the input. This extraction resolves the contradiction by maintaining stability through output filtering while preserving fast response through input-side phase lead compensation.
Solution Approach 2:
The patent inverts the conventional filtering approach by applying the noise filter at the output rather than the input of the control system. Instead of filtering the target cylinder air charge quantity before phase lead compensation, the filter is applied to the target throttle opening degree after compensation. This inversion allows the phase lead compensator to operate on unfiltered signals for fast response while the output filter ensures stability.
2Stability of the object's composition
If multiple filters are applied to each hunting factor (target cylinder air charge quantity, engine rotational speed, valve timing) to eliminate fluctuations, then the system stability improves, but the response is further delayed due to cumulative phase lag
Solution Approach 1:
The patent extracts the noise filtering requirement from multiple individual filters and consolidates it into a single filter applied at the output. Rather than filtering each hunting factor (target cylinder air charge quantity, engine rotational speed, valve timing) separately, the solution applies one noise filter to the target throttle opening degree, eliminating the need for multiple filters and their cumulative phase lag effects.
Solution Approach 2:
The patent merges multiple filtering operations into a single filtering operation at the output stage. Instead of applying separate filters to target cylinder air charge quantity, engine rotational speed, and valve timing, the solution combines these filtering requirements into one noise filter applied to the target throttle opening degree, reducing total phase lag while maintaining stability.
Data Source
AI summary
A target throttle opening degree computing device of a control apparatus computes a target throttle opening degree of a throttle valve and includes a phase lead compensator. A filter filters the target throttle opening degree to provide an ultimate target throttle opening degree, which is used to drive a drive motor to adjust an opening degree of the throttle valve.