Antiphase Torque Timing for Engine Fuel Cut Vibration
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Solution Overview
Problem
Conventional methods for canceling vehicle vibration caused by fuel cut in internal combustion engines do not account for the torque level difference before and after fuel cut, leading to inappropriate timing of antiphase torque generation, which can worsen the vibration.
Innovation Solution
The control method adjusts the timing of generating antiphase torque to be later than normal operation in cases of high torque idle operation, where the torque of the internal combustion engine is higher than normal, by selecting appropriate combustion and non-combustion cylinders based on engine speed and gear ratio, and increasing fuel injection to match the torque level difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fuel cut is implemented in high torque idle operation, then fuel consumption is reduced, but the timing of antiphase torque generation becomes inappropriate, worsening vehicle vibration
Solution Approach 1:
The patent applies dynamics by making the antiphase torque generation timing adaptive rather than fixed. The control device dynamically adjusts the timing based on detected drive shaft torque characteristics, allowing the system to respond to varying torque conditions in high torque idle operation and achieve appropriate vibration cancellation timing
Solution Approach 2:
The patent changes the timing parameter of antiphase torque generation based on detected torque characteristics. By monitoring the drive shaft torque and identifying when it turns negative, the system adjusts the fuel injection timing parameter to generate antiphase torque at the optimal moment, resolving the vibration issue in high torque conditions
2Object-affected harmful factors
If antiphase torque is generated at normal operation timing, then vibration cancellation is effective in normal conditions, but timing becomes inappropriate in high torque idle operation, failing to suppress vibration
Solution Approach 1:
The patent implements feedback by continuously detecting the drive shaft torque and using this information to adjust the antiphase torque generation timing. The control device monitors the actual torque characteristics and modifies the fuel injection timing accordingly, ensuring accurate timing adaptation across different operating conditions including high torque idle operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses vehicle vibration by delaying the antiphase torque generation to align with the delayed torque change of the drive shaft, reducing the amplitude of torsional vibration.
Implementation Method 1
an internal combustion engine 1 structured to generate torque by combustion of a fuel and an air
Implementation Method 2
torsional vibration in a drive system. The torsional vibration results in frontward and rearward vibration of the vehicle
Data Source
AI summary
A control method for an internal combustion engine configured to implement fuel cut in response to becoming zero of an accelerator opening degree during travel of a vehicle, and generate an antiphase torque after the fuel cut by supplying fuel to a cylinder, in order to cancel out vibration of the vehicle caused due to the fuel cut includes setting a timing of generating the antiphase torque to be later than that for normal operation, in response to implementation of the fuel cut under high torque idle operation in which a torque of the internal combustion engine immediately before the fuel cut where the accelerator opening degree is zero is higher than that in the normal operation.