Hybrid Engine Mount Control for Vibration Isolation
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Solution Overview
Problem
Existing technologies for internal combustion engines in hybrid vehicles fail to maintain effective vibration damping performance when the engine is started during acceleration or deceleration, leading to reduced NV (Noise Vibration) performance and discomfort for the driver.
Innovation Solution
An internal combustion engine control device that includes a rechargeable battery, a generation unit, a motor, and a vibration isolating mount, with a control system that determines whether to activate or deactivate the engine based on the mount displacement quantity to prevent excessive vibration transmission to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the internal combustion engine is started while the HEV is being accelerated or decelerated, then the engine can provide power assistance, but the vibration isolating function of the engine mount is reduced and vibration is transmitted to the vehicle body
Solution Approach 1:
The control device determines the mount displacement quantity before allowing engine start, and prohibits start if the mount is in a contracted state. This preliminary check prevents vibration transmission before it occurs by assessing the mount's vibration isolating capability in advance.
Solution Approach 2:
The system continuously monitors the mount displacement quantity and uses this feedback to control engine start permission. The control device adjusts engine start availability based on real-time mount status, creating a closed-loop control system that adapts to changing vehicle conditions.
2Productivity
If the engine is started when the mount is contracted, then power availability is improved, but NV performance deteriorates due to reduced vibration damping
Solution Approach 1:
The system dynamically adjusts engine start permission based on real-time mount displacement quantity. Rather than a fixed start strategy, the control device adapts start availability to current vehicle acceleration/deceleration conditions and mount state, optimizing both responsiveness and NV performance.
Solution Approach 2:
The control device changes the operational parameter of engine start permission based on the mount displacement quantity parameter. When the mount displacement exceeds a threshold indicating contracted state, the system changes start permission from allowed to prohibited, adjusting system behavior based on parameter thresholds.
3Ease of operation
If the engine mount absorbs vibration during cruising, then vehicle comfort is maintained, but during acceleration or deceleration the mount contracts and vibration absorption capability is reduced
Solution Approach 1:
The system applies preliminary anti-action by prohibiting engine start when the mount is in a contracted state that would reduce vibration isolation. This preventive measure counteracts potential vibration transmission before the engine starts, maintaining vehicle comfort by avoiding starts during unfavorable mount conditions.
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 system effectively suppresses the reduction in NV performance by stabilizing the mount displacement quantity, ensuring that the engine is started or stopped only when necessary, thereby minimizing vibration transmission and enhancing driver comfort.
Implementation Method 1
the internal combustion engine 11 is connected to the vehicle body 13 via an engine mount 12 having a vibration isolating function
Implementation Method 2
springs by which the internal combustion engine 11 is connected to the vehicle body 13 exhibit the vibration isolating function of the engine mount 12
Implementation Method 3
when the HEV 10 is being accelerated or decelerated, a large magnitude of force acting in the heading direction or an opposite direction thereto is exerted on the internal combustion engine 11
Data Source
AI summary
A hybrid vehicle includes a battery, a generation unit having an internal combustion engine and a generator configured to supply electric power generated to a motor or the battery, the motor, and a mount which connects the internal combustion engine to a vehicle body. An internal combustion engine control device for the vehicle includes a generation unit activation determination portion which determines whether or not the generation unit needs to be activated to operate, a mount displacement quantity deriving portion which derives a mount displacement quantity indicating an extended/contracted length of the mount, and an internal combustion engine control portion which prohibits a start of the internal combustion engine a case the mount displacement quantity exceeds a threshold.