Electronic Throttle Control for Engine Stall Prevention
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Solution Overview
Problem
Conventional electronic control methods for throttles often result in sudden engine rotation speed drops and engine stalls 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 a value obtained by subtracting the product of rotational acceleration and a coefficient from the product of rotation speed deviation and coefficient to generate the integral torque, ensuring the integral torque accelerates when positive and decelerates when negative, preventing excessive reduction in engine rotation speed.
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 integral torque excessively decreases when engine rotation speed is higher than command speed, causing engine rotation speed undershoot and stall
Solution Approach 1:
The patent modifies the integral torque calculation by changing the parameter being integrated. Instead of integrating only the product of rotation speed deviation and coefficient, it integrates the difference between this product and the product of rotational acceleration and coefficient. This parameter change prevents excessive reduction of integral torque while maintaining control accuracy.
Solution Approach 2:
The patent introduces rotational acceleration as a feedback parameter in the integral torque calculation. By subtracting the product of rotational acceleration and coefficient from the product of deviation and coefficient before integration, the system dynamically adjusts the integral torque based on actual rotational behavior, preventing undershoot and stall.
2Device complexity
If the engine rotation speed is controlled using conventional proportional-integral control, then the control structure is simple and easy to implement, but the engine rotation speed suddenly drops and engine stall occurs when load is applied
Solution Approach 1:
The patent maintains the proportional-integral control structure but changes the parameter being integrated from simple deviation to a corrected value that accounts for rotational acceleration. This minimal modification to the control parameters preserves structural simplicity while dramatically improving reliability under load conditions.
Solution Approach 2:
The patent performs preliminary calculation of rotational acceleration and its product with coefficient before the integration step. This preliminary action prepares the corrected integrand in advance, allowing the control structure to remain simple while incorporating advanced compensation for load-induced speed drops.
Data Source
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AI summary
There is provided an electronic control method for a throttle (2) by an electronic control throttle device (1A) that performs opening and closing control of the throttle while an electronic control unit (10A) generates a control signal based on an input data signal, the method, by the electronic control unit, including: calculating an engine rotation speed deviation and an engine rotational acceleration; obtaining a proportional torque and an integral torque by using the engine rotation speed deviation and the engine rotational acceleration; 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.