Electronic Throttle Control Using Forgetting-Coefficient PI Torque
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Solution Overview
Problem
Conventional electronic throttle control systems experience excessive overshooting or prolonged convergence times when adjusting engine revolution speed due to load changes, leading to inefficiencies in fuel consumption and performance.
Innovation Solution
An electronic throttle control method that calculates engine revolution speed deviation and acceleration, using a forgetting coefficient to adjust proportional and integral torques, thereby generating a control signal to manage throttle opening and closing efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If integral torque is continuously integrated in accordance with engine revolution speed deviation to maintain constant engine revolution speed under load, then engine revolution speed stability is improved, but integral torque takes a long time to return to steady state after load removal, causing excessive overshooting or prolonged convergence
Solution Approach 1:
The patent applies dynamics by making the integral torque coefficient (Ki) variable rather than constant. The control system dynamically adjusts Ki based on the current operating state (load conditions, revolution speed deviation magnitude) to optimize the integral torque's response characteristics. This allows the system to maintain stability during load changes while enabling faster convergence after load removal, resolving the contradiction between stability and convergence time.
Solution Approach 2:
The patent changes the parameter of the integral torque coefficient (Ki) from a fixed value to a variable that adapts to different operating conditions. By modifying this parameter based on system state, the integral torque can provide strong corrective action when needed (maintaining stability) while avoiding excessive accumulation that causes delayed convergence, thus resolving the technical contradiction.
2Measurement precision
If integral torque is continuously integrated to match engine revolution speed with command under load, then speed tracking accuracy is improved, but the system exhibits excessive overshooting and slow response after load removal
Solution Approach 1:
The patent makes the integral torque coefficient dynamic, allowing it to be adjusted based on the current operating state. During load application, a higher Ki value ensures accurate speed tracking, while during load removal, the coefficient is reduced to prevent excessive overshooting and enable faster response, thus resolving the contradiction between tracking accuracy and response characteristics.
Solution Approach 2:
By changing the integral torque coefficient parameter based on operating conditions, the system achieves high precision speed tracking when needed while maintaining good response characteristics during transitions, eliminating the trade-off between accuracy and ease of operation.
Data Source
AI summary
An electronic throttle control method by which an electronic control unit (ECU) controls opening and closing of a throttle while providing a control signal on a basis of an input data signal may include calculating, via the ECU, i) an engine revolution speed deviation from a difference between an engine revolution speed and an engine revolution speed command, ii) an engine revolution acceleration on a basis of the engine revolution speed, iii) a proportional torque from a product of the engine revolution speed deviation and a proportional torque coefficient, and iv) an integral torque by multiplying an integral of a product of the engine revolution speed deviation and an integral torque coefficient by a forgetting coefficient. The method may further include providing, via the ECU, the control signal for the throttle using a sum of the proportional torque and the integral torque as a torque command value.