Torque Feedback Control Switching for Engine Vibration Reduction
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Solution Overview
Problem
Internal combustion engines experience undesirable noise and vibration during idling due to variations in RPM and operating conditions, which existing control methods fail to adequately manage, especially when shifting into reverse gear or moving in reverse.
Innovation Solution
A system and method that switches between open-loop and closed-loop feedback control for an internal combustion engine's torque management, using a powertrain control module to detect reverse gear activation or movement, switching from open-loop to closed-loop control to maintain stable engine speed and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open-loop control is used during vehicle idling, then device complexity is reduced and efficiency is improved, but engine speed stability deteriorates and noise/vibration increases during reverse gear operation
Solution Approach 1:
The control system dynamically switches between open-loop and closed-loop control modes based on detected vehicle conditions (neutral, forward gear, reverse gear). This allows the system to adapt its complexity and control strategy to match the specific operating conditions, maintaining simplicity when possible while providing enhanced stability when needed.
Solution Approach 2:
The system changes the control parameter mode (from open-loop to closed-loop feedback control) based on the detected gear condition. When reverse gear is detected, the control mode parameter switches to closed-loop, enabling the system to maintain engine speed stability during conditions that cause undesirable vibrations.
2Stability of the object's composition
If closed-loop feedback control is used continuously, then engine speed stability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The control operation is segmented into different modes based on vehicle conditions. Open-loop control is used during neutral and forward gear operations, while closed-loop control is specifically activated only during reverse gear operation. This segmentation allows the system to apply complex control only when necessary, reducing overall system complexity and energy consumption.
Solution Approach 2:
Instead of applying closed-loop control continuously (excessive action), the system applies it partially only when reverse gear is detected. This partial action approach maintains engine speed stability during the specific condition that causes problems while avoiding the continuous complexity and energy overhead of closed-loop control during all operating conditions.
3Productivity
If feedback control switching is implemented based on gear detection, then engine performance is improved during reverse operation, but measurement precision requirements increase
Solution Approach 1:
The system uses the powertrain control module as an intermediary that integrates gear position detection from the transmission control module. This intermediary approach allows the control system to receive processed gear position information without requiring direct high-precision measurement capabilities, as the transmission control module already performs the detection and provides the signal to the powertrain control module.
Data Source
AI summary
An apparatus, method, and system for controlling the torque of an internal combustion engine during certain vehicle component operations to minimize unwanted motion and vibration. The method includes detecting at least one of reverse gear engagement or reverse movement of the vehicle; wherein a feedback control of the internal combustion engine is switched from open-loop control to closed-loop control upon detection of at least one of a reverse gear activation or reverse movement of the vehicle.