Skip Fire Engine Control Torque Feedback Vibration
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Solution Overview
Problem
Skip fire engine control technologies face challenges in vibration control, leading to rough engine operation and hindering widespread adoption due to the inability to satisfactorily manage undesirable vibrations, which affect passenger comfort and limit commercial success.
Innovation Solution
The implementation of a skip fire engine control system that uses torque feedback, filtered to remove high-frequency components, to determine the firing sequence, incorporating a sigma-delta converter and variable frequency filters to suppress undesirable vibrations and stabilize the engine operation, thereby improving fuel economy and reducing engine vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If skip fire engine control is implemented to improve fuel economy, then fuel efficiency is improved, but vibration increases making the engine run rougher
Solution Approach 1:
The patent implements a feedback control system that uses torque feedback signals to dynamically adjust the firing sequence of cylinders. The controller receives torque feedback from the engine and uses this information to determine optimal firing patterns, thereby reducing vibrations while maintaining fuel economy benefits of skip fire operation.
Solution Approach 2:
The patent employs dynamic adjustment of the firing sequence based on real-time torque feedback conditions. The controller continuously adapts the skip fire pattern according to varying engine operating conditions, transforming the static skip fire concept into a dynamic control system that can optimize both fuel economy and vibration reduction across different operating states.
2Object-affected harmful factors
If torque feedback control is implemented to reduce vibrations, then vibration control is improved, but system complexity increases
Solution Approach 1:
The patent introduces a torque feedback signal as an intermediary that bridges the engine's mechanical output and the electronic control system. This torque feedback acts as a mediator that provides essential information for vibration control without requiring direct complex sensing of vibration parameters, thereby simplifying the overall control architecture while achieving vibration reduction.
3Stability of the object's composition
If high frequency torque feedback components are removed through filtering to stabilize the system, then system stability is improved, but response precision may be reduced
Solution Approach 1:
The patent applies frequency filtering to the torque feedback signal to remove high-frequency components that cause system instability. By changing the frequency parameters of the torque feedback signal through filtering, the system achieves stable operation while retaining the essential low-frequency torque information needed for control decisions.
Data Source
AI summary
A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. In one aspect, the working chamber firing that are selected to deliver the desired engine output are determined at least in part based on torque feedback. The torque feedback may be an indication of the torque output of the engine or the torque experienced at some other location in the drive train. In some embodiments, the torque feedback signal is filtered to remove high frequency components of the torque feedback signal in order to help stabilize the system. In another aspect, other operational parameters are used as feedback in the determination of the firing sequence. In yet another aspect, a filter is arranged to filter a feedback signal to provide a filtered feedback signal that is used in the determination of the working chamber firings.