CVVD Actuator Control via Corrected Phase Angle
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Solution Overview
Problem
Conventional continuously variable valve duration (CVVD) systems face challenges in achieving stable actuator control due to complex configurations and high costs, particularly when abnormalities occur in the actuator controller, leading to inaccurate valve duration adjustments.
Innovation Solution
A system that includes an electronic control unit (ECU) and an actuator controller, which outputs a command phase angle and selection signal based on vehicle state and mode, utilizing PID control and PWM signals to adjust the actuator, allowing for stable control of CVVD by generating corrective phase angles in abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional actuator controller is used to control CVVD, then the configuration is simple, but the control stability deteriorates when abnormalities occur
Solution Approach 1:
The system changes the control parameter from a fixed target phase angle to a corrected phase angle that adapts based on abnormality detection. When abnormalities are detected in the actuator or sensor, the controller automatically adjusts the phase angle parameter to maintain stable CVVD control, resolving the contradiction between simple configuration and reliable operation.
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual phase angle and comparing it with the target phase angle. When deviations or abnormalities are detected, the controller generates corrected phase angles based on feedback signals, ensuring stable control without increasing overall system complexity.
2Speed
If the target phase angle is used directly in abnormal conditions, then the response is fast, but the control accuracy deteriorates
Solution Approach 1:
The system performs preliminary correction of the phase angle before executing the control action. When abnormalities are detected, the controller pre-calculates a corrected phase angle that compensates for expected errors, ensuring both fast response and high accuracy without waiting for error accumulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides more stable and accurate control of CVVD by adjusting the actuator's electric current output based on vehicle state and mode, ensuring optimal valve duration adjustments even in abnormal conditions, enhancing engine performance and fuel efficiency.
Implementation Method 1
an actuator controller configured to operate on the basis of the command phase angle and the selection signal and output an electric current to adjust the actuator
Implementation Method 2
A first proportional-integral-derivative (PID) control unit may be configured to generate a calculative phase angle, obtained by adjusting the target phase angle based on a phase deviation between the target phase angle output from the command generation unit and an actual phase angle received from the actuator
Implementation Method 3
a pulse width modulation (PWM) generation unit configured to generate a PWM signal corresponding to the command phase angle originating from the demultiplexer or a PWM signal corresponding to the calculative phase angle originating from the second PID control unit
Data Source
AI summary
A system for controlling a CVVD by adjusting an actuator for controlling the CVVD is provided. The system includes an electronic control unit (ECU) configured to output a command phase angle and a selection signal for controlling the actuator based on a vehicle state and a mode of operation, and an actuator controller configured to operate based on the command phase angle and the selection signal and output an electric current to adjust the actuator. The actuator controller is configured to output an electric current corresponding to the command phase angle originating from the ECU or adjust the command phase angle and then output an electric current corresponding to the corrected command phase angle based on a type of selection signal.