Engine Torque Shock Suppression via Dynamic Cylinder Fuel Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine control methods fail to reliably suppress torque shock during engine stopping and restarting, particularly when engine revolution speed or transmission reduction ratio deviates from reference settings, as they do not account for varying combustion intervals and torsional vibrations in the drivetrain.
Innovation Solution
Implement a control method that determines a predetermined number of cylinders to undergo combustion after fuel supply stop, temporarily restarting fuel supply to specific cylinders based on engine revolution speed and reduction ratio, adjusting the number of injection stop and execute cylinders to align with engine torque fluctuations and reduce torque shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a preset fuel injection pattern is invariably applied to suppress torque shock, then the control is simple and easy to implement, but the torque shock cannot be reliably suppressed when engine revolution speed or transmission reduction ratio differs from reference settings
Solution Approach 1:
The patent applies dynamics by making the fuel injection control pattern variable rather than fixed. The control device dynamically adjusts the injection pattern based on detected engine revolution speed and transmission reduction ratio, changing the number of cylinders receiving fuel injection and the timing accordingly. This dynamic adaptation ensures reliable torque shock suppression across different operating conditions while maintaining manageable control complexity through automated detection and adjustment.
2Loss of energy
If fuel supply is stopped to reduce fuel consumption, then fuel efficiency improves, but torque shock occurs during stopping and restarting
Solution Approach 1:
The patent applies partial action by selectively controlling fuel injection to only certain cylinders rather than all cylinders or continuous injection. During torque shock suppression periods, fuel is injected into a specific number of cylinders (less than all cylinders) to generate just enough engine torque to counteract the torque shock, rather than applying full power. This partial fuel injection achieves the necessary vibration suppression while minimizing fuel consumption compared to full-cylinder injection.
3Object-affected harmful factors
If the number of cylinders receiving fuel injection is increased to suppress torque shock, then vibration control improves, but fuel consumption increases
Solution Approach 1:
The control device dynamically adjusts the number of cylinders receiving fuel injection based on the detected engine revolution speed and transmission reduction ratio. At different operating conditions, different numbers of cylinders are selected to receive fuel during the torque shock suppression period. This dynamic optimization ensures that the minimum necessary number of cylinders are activated to suppress vibration, avoiding unnecessary fuel consumption while maintaining effective vibration control.
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
Effectively suppresses torque shock by generating engine torque at appropriate times and durations, aligning with drivetrain torque fluctuations, thereby improving vibration control during both stopping and restarting fuel supply.
Implementation Method 1
determined whether a first predetermined number of cylinders have undergone a combustion stroke after the stop of the fuel supply
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
It is determined whether a predetermined fuel supply stop condition has been fulfilled; stop time vibration suppression control of, after stop of fuel supply in response to fulfillment of the predetermined fuel supply stop condition, temporarily performing fuel supply to the engine to suppress vehicle vibration is executed; and fuel supply to all cylinders is stopped after the execution of the stop time vibration suppression control. In the stop time vibration suppression control, it is determined whether a first predetermined number of cylinders according to an engine revolution speed or a reduction ratio from the engine to drive wheels have undergone a combustion stroke after the stop of the fuel supply, and in a case where the first predetermined number of cylinders have undergone the combustion stroke, fuel supply to a second predetermined number of cylinders is performed. The first predetermined number is increased as the engine revolution speed is higher, and increased as the reduction ratio from the engine to the drive wheels is higher.