Adaptive Fuel Injection for Engine Mount Vibration Control
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Solution Overview
Problem
In hybrid and plug-in hybrid vehicles, the existing internal combustion engine control devices cause driver discomfort due to vibrations during engine start-up while driving, especially when the mount is elastically deformed, as the power variation is steep, leading to increased vibrations transmitted to the vehicle body.
Innovation Solution
An in-vehicle internal combustion engine control device that detects the degree of deformation of the mount coupling the engine to the vehicle body and adjusts the first-cycle and second-cycle fuel injection amounts accordingly, setting the first-cycle amount larger than the second-cycle when deformation is large to reduce the time interval between cranking and combustion vibrations, thereby alleviating driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the second-cycle fuel injection amount is set so as to be larger than the first-cycle fuel injection amount to suppress steep power variation, then driver's uncomfortable feeling is alleviated when the mount deformation is small, but vibrations due to initial combustion are not favorably reduced when the mount deformation is large
Solution Approach 1:
The patent applies dynamics by making the fuel injection control strategy adaptive to real-time mount deformation conditions. The ECU dynamically switches between two fuel injection patterns (first-cycle larger or second-cycle larger) based on the detected mount deformation amount, allowing the system to optimize vibration suppression effectiveness under varying operating conditions rather than using a fixed injection strategy
Solution Approach 2:
The patent changes the parameter of fuel injection amount distribution between cycles based on mount deformation detection. When mount deformation is large, the system changes to make the first-cycle fuel injection amount larger than the second-cycle amount, whereas when deformation is small, it makes the second-cycle amount larger. This parameter adjustment optimizes the timing of combustion vibrations relative to cranking vibrations to suppress overall vibration transmission
2Duration of action of moving object
If the EV drive mode range is expanded in PHV to increase battery charging capacity, then the vehicle can operate longer in electric mode, but the mount elastically deforms by a large amount during engine start-up, reducing the mount's ability to suppress vibrations
Solution Approach 1:
The patent applies preliminary action by detecting the mount deformation amount before engine start-up and pre-determining the appropriate fuel injection pattern. The ECU uses the detected deformation state to select in advance whether to use first-cycle larger or second-cycle larger fuel injection amounts, ensuring that the vibration suppression strategy is already optimized before the engine starts and vibrations occur
Solution Approach 2:
The patent implements feedback by using the detected mount deformation amount as input to the control system. The ECU continuously monitors the mount deformation state and uses this feedback information to adjust the fuel injection control strategy, creating a closed-loop system that adapts to the actual mechanical state of the vehicle during engine start-up
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
The control device effectively reduces driver discomfort by gently increasing engine power output and utilizing elastic deformation to minimize vibrations when deformation is small, and by causing initial combustion vibrations earlier when deformation is large, thus shortening the interval between cranking and combustion vibrations.
Implementation Method 1
a mount that couples the internal combustion engine to a body of the vehicle and that reduces transmission of vibrations of the engine to the body of the vehicle through elastic deformation of the mount
Data Source
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AI summary
At the time of an engine start while the vehicle is driving, when a required vehicle driving force (TRQ) is smaller than or equal to a predetermined value (TRQth), an electronic control unit (20) estimates that the degree of deformation of a mount (11) is smaller than or equal to a predetermined degree and sets a second-cycle fuel injection amount (Q2) so as to be larger. than a first-cycle fuel injection, amount (Ql) at the time of the engine start. On the other hand, when the required vehicle driving force (TRQ) is larger than the predetermined value (TRQth), the electronic control unit (20) estimates that the degree of deformation of the mount (11) is larger than the predetermined degree and sets the first-cycle fuel injection amount (Ql) so as to be larger than the second-cycle fuel injection amount (Q2) at the time of the engine start.