Electronic Control Throttle Torque Smoothing
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Solution Overview
Problem
Conventional electronic control throttle devices struggle to accurately distinguish between engine speed increase and decrease states, leading to rotational fluctuation and discontinuous torque changes, especially when loads are applied or removed, resulting in operational failures.
Innovation Solution
The electronic control throttle device divides engine operating states into four regions based on engine speed and rotational angular acceleration to adjust proportional and integral control coefficients, generating a smoothing torque that continuously changes the torque command, preventing fluctuations and operational failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the engine operating state is divided into two regions (higher than speed command and lower than speed command) for proportional and integral control, then the control structure is simple, but the engine speed fluctuation cannot be effectively suppressed when load changes occur
Solution Approach 1:
The patent divides the engine operating state into four distinct regions based on two parameters: speed deviation (ωref−ω) and rotational angular acceleration (ω'). This segmentation allows for more precise control coefficient selection compared to the conventional two-region approach. Each region (A, B, C, D) has specific control coefficients that are optimized for that particular operating condition, enabling effective suppression of engine speed fluctuation during load changes while maintaining a manageable control structure.
2Speed
If the control coefficients are switched discontinuously between regions, then the response to load changes is fast, but discontinuous torque changes occur causing operational failures
Solution Approach 1:
The patent introduces a smoothing torque (ΔTorqref) that is calculated in advance based on the difference between control coefficients in adjacent regions and the current speed deviation. This smoothing torque is added to the torque command before region switching occurs, ensuring continuous torque output. The preliminary calculation of the smoothing component prevents discontinuous torque changes that would otherwise occur during region transitions, thereby maintaining operational reliability while preserving fast response characteristics.
3Device complexity
If only speed deviation is used for region division, then the control logic is simple, but the distinction between speed increase and speed decrease states cannot be made
Solution Approach 1:
The patent adds a second dimension (rotational angular acceleration ω') to the conventional one-dimensional speed deviation-based region division. By using the sign of ω' (positive for accelerating, negative for decelerating), the system can distinguish between speed increase and speed decrease states within each speed deviation region. This dimensional expansion transforms the control logic from simple but imprecise to slightly more complex but highly precise, enabling accurate identification of engine state transitions.
Data Source
AI summary
An electronic control method for a throttle performed by an electronic control throttle device is disclosed. The electronic control method includes: generating, by the electronic control section, the control signal for the throttle with a sum of a proportional torque and an integral torque as a value of a torque command, by calculating an engine speed deviation from a difference between a calculated or input engine speed and an input engine speed command; calculating an engine rotational angular acceleration based on the engine speed; obtaining the proportional torque from a product of the engine speed deviation and a predetermined coefficient; and obtaining the integral torque by integrating the product of the engine speed deviation and the predetermined coefficient.