Engine Vibration Reduction via Torque-Controlled Fuel Injection
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Solution Overview
Problem
Existing methods for reducing engine vibration during key-off in commercial vehicles are ineffective due to leakage issues and increased complexity, and simply delaying fuel injection stop time can conflict with torque control methods.
Innovation Solution
A system that finely injects fuel based on a target torque value set by an engine control device, using a fuel injection device and measurement device to control fuel injection until the engine's rotational torque reaches zero, thereby reducing vibration through precise torque management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If intake air is blocked to reduce vibration, then vibration reduction effect is improved, but leakage occurs between intake manifold and throttle valve reducing effectiveness
Solution Approach 1:
The invention extracts the vibration reduction function from the intake air blocking system and implements it through fuel injection control. Instead of blocking intake air at the throttle valve, the system continues to supply intake air but controls fuel injection to stop engine operation, thereby eliminating leakage issues while maintaining vibration reduction effectiveness.
Solution Approach 2:
The invention introduces fuel injection control as an intermediary mechanism between the driver's key-off action and engine stop. By controlling fuel supply to cylinders individually or collectively, the system achieves smooth engine shutdown and vibration reduction without the need for physical intake air blocking, thus avoiding leakage problems.
2Object-affected harmful factors
If intake air is blocked to reduce vibration, then vibration reduction effect is improved, but device complexity increases due to additional components
Solution Approach 1:
The invention makes the existing fuel injection system perform the additional function of vibration reduction during key-off. The same fuel injection device used for normal engine operation is controlled to gradually reduce fuel supply, achieving vibration reduction without requiring separate dedicated components. This multi-functional approach eliminates the need for solenoid valves, negative pressure hoses, and other additional parts.
Solution Approach 2:
The fuel injection system serves itself by using its existing capability to control engine shutdown. The ECU manages the entire process of gradual fuel reduction and cylinder-by-cylinder shutdown using the already-present fuel injection hardware, making the system self-sufficient without external vibration reduction components.
3Object-affected harmful factors
If fuel injection stop time is delayed to reduce vibration, then vibration reduction effect is improved, but conflict with existing torque control method occurs
Solution Approach 1:
The invention dynamically adjusts fuel injection timing and amount based on real-time engine conditions during key-off. The ECU monitors engine speed, load, and vibration levels, then adaptively controls fuel injection to achieve smooth shutdown. This dynamic control allows the system to delay fuel stop timing when beneficial for vibration reduction while automatically adapting to maintain compatibility with torque control requirements.
Solution Approach 2:
The invention changes fuel injection parameters (timing, duration, amount) during the key-off transition period. By gradually reducing fuel injection quantity and adjusting timing, the system achieves smooth engine deceleration and vibration reduction. The ECU modifies these parameters in real-time to balance vibration reduction with torque control compatibility, allowing flexible adaptation without fixed delays.
4Object-affected harmful factors
If intake air is suddenly blocked during driving, then vibration is reduced, but vehicle safety problems occur such as accidents and inability to travel
Solution Approach 1:
The invention applies preliminary anti-action by preparing the engine for shutdown through gradual fuel reduction before complete stop. During normal driving, the system monitors conditions and only initiates fuel injection control when key-off is detected or shutdown is required. This prevents sudden engine stop during driving while ensuring smooth shutdown when intended, thereby maintaining vehicle safety while achieving vibration reduction.
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 significantly reduces engine and vehicle vibrations during key-off without adding expensive components, improving vehicle sensibility and reliability while maintaining existing torque control logic.
Implementation Method 1
a fuel injection device configured for injecting fuel stored in a fuel tank into a combustion chamber of an engine depending upon a target torque value
Implementation Method 2
a measurement device configured for measuring the RPM and the rotational torque of the engine
Implementation Method 3
the piston in the cylinder of the engine keeps the inertia movement for a predetermined time despite the stop of the fuel supply
Implementation Method 4
by gradually stopping the engine using a method of blocking the intake air when the ignition key is turned off, a method of reducing vibration generated when the ignition key is turned off is used
Data Source
AI summary
A vibration reduction device upon KEY-OFF of an engine may include a fuel injection device for injecting fuel stored in a fuel tank into a combustion chamber of an engine depending upon a target torque value, a measurement device for measuring the RPM and the rotational torque of the engine, and an controller for detecting whether or not an engine becomes KEY-OFF and when it is determined to be in KEY-OFF state, setting a reference torque value, and setting a torque value changing the reference torque value depending upon a predetermined reference as the target torque value and controlling the fuel injection device to finely inject fuel into the engine depending upon the target torque, thus reducing engine vibration.