Electronic Throttle Control Delay Compensation
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Solution Overview
Problem
Existing electronic throttle control systems face challenges in achieving responsive and stable throttle control due to motion restrictions and delays in the intake air system, leading to deviations in the actual intake air amount and potential overshooting, which deteriorate the control accuracy and stability.
Innovation Solution
A control system that calculates a target opening degree for the throttle valve based on the deviation between the target and presumed intake air amounts or pressures, considering motion restrictions and delays, using a reversed model of the intake air system to accurately determine the presumed values and compensate for delays, thereby improving response and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If motion restriction is added to the throttle valve control for exhaust gas emission, then exhaust gas emission is improved, but the response for throttle control deteriorates due to deviation between target and actual intake air amount
Solution Approach 1:
The invention calculates a presumed intake air amount that anticipates the actual intake air amount after motion restriction is applied to the throttle valve. By performing this preliminary calculation of the presumed value before the actual control action, the system can determine an appropriate target opening degree that compensates for the motion restriction, thereby maintaining both emission control and responsive throttle behavior
Solution Approach 2:
The system uses feedback by calculating the deviation between the target intake air amount and the presumed intake air amount. This deviation information is fed back to adjust the target opening degree of the throttle valve, enabling the control system to account for motion restrictions while maintaining accurate intake air control and improving response characteristics
2Measurement precision
If compensation is carried out for deviation and delay in target opening degree to reduce deviation between target and actual values, then control accuracy is improved, but overshoot for opening degree may occur and stability deteriorates
Solution Approach 1:
Instead of applying full compensation for both deviation and delay, the invention uses partial action by calculating only the presumed intake air amount based on the motion-restricted throttle valve opening degree. This partial compensation approach avoids excessive correction that would cause overshoot, while still improving control accuracy by accounting for the motion restriction effect
Solution Approach 2:
The system performs preliminary anti-action by calculating the presumed intake air amount that anticipates the effect of motion restriction before it fully impacts the control. This preliminary calculation allows the control system to pre-adjust the target opening degree in a controlled manner, preventing the need for large corrective actions that would cause overshoot and instability
Data Source
AI summary
In an electronic throttle control system, a target intake pipe pressure as well as a presumed value for the intake pipe pressure is calculated, so that a deviation between the target value and the presumed value for the intake pipe pressure is calculated. The deviation is compensated in an advancing side by an amount corresponding to a delay of response in the throttle control system. An intake air amount passing through a throttle valve is calculated based on the above compensated deviation and a presumed intake air amount. A target opening degree of a throttle valve is finally calculated based on the above-calculated intake air amount passing through a throttle valve. Accordingly, a response and stability of the throttle control can be improved.