Throttle Control Apparatus for Small Opening Followability
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Solution Overview
Problem
In throttle control systems, especially in regions with small throttle openings, the distortion of the throttle shaft due to intake pressure leads to reduced followability of the throttle to accelerator operations, causing control response deterioration.
Innovation Solution
A control apparatus comprising a throttle, an accelerator opening sensor, a throttle opening sensor, and a control unit that sets a target opening and adjusts the control amount based on detected deviations, with a correction unit adding a control amount to improve throttle opening independently of deviations when the target opening is small, thereby enhancing followability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the throttle opening is kept small to match accelerator operation, then the throttle response to accelerator operation is improved, but the throttle shaft distortion caused by intake pressure increases, reducing followability
Solution Approach 1:
The control unit applies preliminary correction to the control amount before the throttle shaft distortion fully affects the throttle opening. By detecting the target opening based on accelerator opening and pre-adjusting the control amount to compensate for expected distortion at small openings, the system maintains accurate throttle followability without waiting for distortion to manifest.
Solution Approach 2:
The control unit changes the control parameter (control amount) dynamically based on the target opening value. When the target opening is determined to be small, the control unit adjusts the control amount to include a correction component that compensates for intake pressure distortion, thereby maintaining reliable throttle opening control across different operating conditions.
2Manufacturing precision
If the control amount is adjusted based on deviation to achieve precise throttle opening, then manufacturing precision is improved, but the followability in small opening regions deteriorates due to amplified distortion effects
Solution Approach 1:
The control unit applies different control strategies for different operating regions. Specifically, when the target opening is small, the control unit uses a correction mechanism that adds a fixed correction amount to the control amount, whereas for larger openings, standard deviation-based control is used. This localized adjustment ensures optimal performance for each region, particularly improving followability in the challenging small opening region.
Data Source
AI summary
A control apparatus includes a throttle configured to adjust an amount of air flowing in an intake passage of an engine, an accelerator opening sensor configured to detect an accelerator opening, a throttle opening sensor configured to detect an opening of the throttle, and a control unit configured to control the opening of the throttle. The control unit includes a setting unit configured to set a target opening and set a control amount of the throttle based on a deviation between the target opening and the opening detected by the throttle opening sensor, and a correction unit configured to, if the target opening is not more than a predetermined opening, set a correction amount of the control amount such that the opening of the throttle becomes large independently of the deviation.