Electronic Throttle Control for Engine RPM Convergence
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Solution Overview
Problem
Existing systems with independently controllable electronic throttles for internal combustion engines face slow response times in converging engine rpm to target values, leading to instability.
Innovation Solution
A control device that includes engine rpm detection, target rpm setting, and difference detection means to independently control electronic throttles based on the magnitude of differences between target and actual rpm, setting dead zones and control gains to optimize intake air amounts for each cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If only one electronic throttle is operated while the other is kept constant, then the increase in air amount is restrained to be minimum, but the response time for rpm convergence becomes slow
Solution Approach 1:
The patent applies dynamics by making the dead zone ranges and control gains variable rather than fixed. The dead zone range and control gain for each electronic throttle are adjusted dynamically based on the magnitude of the difference between target rpm and actual rpm. When the difference is large, the dead zone is set wider and control gain is higher to enable faster response. When the difference is small, the dead zone narrows and control gain decreases to maintain stability, thus resolving the contradiction between fast response and stable maintenance.
2Speed
If electronic throttles are operated with large control gains, then rpm convergence speed increases, but stability near target rpm deteriorates
Solution Approach 1:
The control gain is set dynamically based on the magnitude of the rpm difference. When the difference between target rpm and actual rpm is large, a larger control gain is applied to achieve fast convergence. When the difference becomes small (within the dead zone), the control gain is reduced or the throttle is prevented from operating, thereby maintaining stability near the target rpm. This dynamic adjustment of control parameters resolves the contradiction between convergence speed and stability.
Solution Approach 2:
The patent changes the parameters (dead zone range and control gain) of the electronic throttle control system based on the operating condition (magnitude of rpm difference). By adjusting these parameters dynamically, the system achieves both fast response when needed and stable maintenance when close to the target, resolving the contradiction between speed and stability.
3Stability of the object's composition
If dead zones are set for electronic throttles, then stable maintenance of target rpm is improved, but responsiveness to large rpm differences deteriorates
Solution Approach 1:
The dead zone range is set dynamically based on the magnitude of the rpm difference. When the difference is large, the dead zone is set wider to allow the electronic throttle to operate and correct the large deviation. When the difference becomes small, the dead zone narrows to prevent unnecessary throttle operations and maintain stability. This dynamic dead zone adjustment resolves the contradiction between stability and responsiveness.
Data Source
AI summary
Provided is a control unit (1) for setting, for respective electronic throttles (11) and (12) provided for respective cylinders, respective ranges of a difference between a target rpm and an engine rpm where the electronic throttles (11) and (12) are not operated as a first dead zone and a second dead zone, determining, for each of the electronic throttles (11) and (12), whether or not the difference between the target rpm and the engine rpm is in the dead zone, preventing the electronic throttle determined to have the difference in the dead zone from operating, and determining, for the electronic throttle determined to have the difference exceeding the dead zone, a control gain for the electronic throttle depending on the magnitude of the difference, thereby operating the electronic throttle.