Variable Integral Coefficient for Throttle Control Overshooting
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Solution Overview
Problem
Conventional electronically controlled throttle control devices experience throttle overshooting and increased convergence time due to excessive integral calculation of the throttle correction control command, especially with large throttle opening deviations.
Innovation Solution
The solution involves adjusting the coefficient used in the integral calculation of the throttle correction control command based on the throttle driving state, distinguishing between acceleration, deceleration, and small deviation states, and setting the coefficient to be small for acceleration, medium for deceleration, and large for small deviation states to reduce excessive correction and hasten convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integral calculation is performed during the entire period in which the throttle valve is driven, then the throttle correction control command is calculated continuously, but excessive throttle correction control command is caused by the influence of large throttle opening deviation leading to overshooting
Solution Approach 1:
The patent applies dynamics by making the integration period variable rather than fixed. The integration is performed only during specific periods when the throttle opening deviation is within a predetermined range, rather than during the entire driving period. This dynamic adjustment of the integration period prevents excessive correction commands that would cause overshooting, while still providing sufficient correction to achieve the target opening position.
Solution Approach 2:
The patent changes the parameter of integration period based on the throttle opening deviation. When the deviation is large, integration is suspended; when the deviation is within the predetermined range, integration is performed. This parameter change optimizes the balance between correction effectiveness and prevention of overshooting.
2Reliability
If the integral calculation is performed during the entire period in which the throttle valve is driven, then the throttle correction control command is calculated continuously, but the convergence time of the throttle opening increases due to the occurrence of overshoot
Solution Approach 1:
The patent applies dynamics by making the integration period variable rather than fixed. The integration is performed only during specific periods when the throttle opening deviation is within a predetermined range, rather than during the entire driving period. This dynamic adjustment of the integration period prevents excessive correction commands that would cause overshooting, while still providing sufficient correction to achieve the target opening position.
Solution Approach 2:
The patent changes the parameter of integration period based on the throttle opening deviation. When the deviation is large, integration is suspended; when the deviation is within the predetermined range, integration is performed. This parameter change optimizes the balance between correction effectiveness and prevention of overshooting.
Data Source
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AI summary
In an electronically controlled throttle control device in which a throttle control output command calculated by an electronic control unit (ECU) is calculated based on a throttle main control command, calculated from a throttle opening deviation which is a difference between a throttle opening command and a throttle opening detection signal, and a throttle correction control command which is a value obtained by integrating a product of the throttle opening deviation and a coefficient, the coefficient for calculation of the throttle correction control command is changed depending on a driving state based on an acceleration state and a deceleration state of a throttle and a small throttle deviation state.