Electronic Throttle Control Using Rotational Acceleration Feedback
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Solution Overview
Problem
Conventional electronic control methods for throttles in engine intake systems often cause a sudden drop in engine rotation speed and engine stall when a load is applied, due to excessive reduction in integral torque when the engine rotation speed is higher than the command speed.
Innovation Solution
The method calculates engine rotational acceleration and integrates its product with a coefficient to adjust the integral torque, ensuring it accelerates when positive and decelerates when negative, preventing excessive reduction in engine rotation speed and stall by generating a control signal based on the sum of proportional and integral torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integral torque is calculated by simply integrating the product of engine rotation speed deviation and coefficient, then the control follows conventional procedures, but the engine rotation speed undershoots or engine stall occurs when load is applied
Solution Approach 1:
The patent introduces feedback by calculating engine rotational acceleration from engine rotation speed and using it to adjust the integral torque calculation. The control unit continuously monitors engine rotation speed, calculates deviation from target speed, determines rotational acceleration, and feeds this information back to adjust the integral torque to prevent undershoot and stall.
Solution Approach 2:
The patent changes the parameter used in integral torque calculation from simply integrating speed deviation to integrating a corrected value that subtracts the product of rotational acceleration and coefficient. This parameter change in the integration formula prevents excessive reduction of integral torque and avoids engine stall.
2Device complexity
If the product of engine rotation speed deviation and coefficient is integrated, then the control process is simple, but the integral torque constantly decreases when engine rotation speed is higher than command speed
Solution Approach 1:
The patent performs preliminary calculation of engine rotational acceleration based on engine rotation speed before using it to correct the integral torque calculation. This preliminary action of calculating acceleration allows the system to anticipate and prevent excessive torque reduction before it causes engine stall.
Solution Approach 2:
The patent makes the control system dynamic by introducing rotational acceleration as a time-varying parameter that continuously adjusts the integral torque calculation. Instead of static integration of speed deviation, the system dynamically corrects the integration based on acceleration, making the control adaptive to changing engine conditions.
Data Source
AI summary
An electronic control method for a throttle by an electronic control throttle device that controls the throttle while an electronic control unit generates a control signal based on an input data signal. The method may include calculating an engine rotation speed deviation from a difference between an engine rotation speed and an input engine rotation speed command, calculating an engine rotational acceleration based on the engine rotation speed, obtaining a proportional torque from a product of the engine rotation speed deviation and a predetermined coefficient, obtaining an integral torque by integrating a value obtained by subtracting a product of the engine rotational acceleration and the predetermined coefficient from the product of the engine rotation speed deviation and the predetermined coefficient, and generating a control signal for the throttle by using a sum of the proportional torque and the integral torque as a value of a torque command.