Vehicle Drive Force Control for Engine Mount Vibration Reduction
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Solution Overview
Problem
In vehicles capable of switching between two-wheel drive and four-wheel drive, the insulator of the engine mount is crushed as the required drive force increases, leading to difficulty in reducing engine vibration transmission to the vehicle body.
Innovation Solution
A control device that adjusts the drive force distribution between the engine-driven wheels and the separately driven wheels by increasing the drive force source's requirement when the engine's drive force exceeds a predetermined value, thereby reducing the engine mount's load and vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the required drive force of the engine increases, then the drive force to the wheels increases, but the insulator of the engine mount is crushed making it difficult to reduce vibration
Solution Approach 1:
The patent applies dynamics by making the drive force distribution adjustable rather than fixed. The control device dynamically switches between two-wheel drive and four-wheel drive modes based on road conditions, allowing the system to adapt the engine load and consequently the vibration characteristics to match actual driving requirements
Solution Approach 2:
The patent changes the operational parameters of the engine by controlling it to operate at different rotation speeds depending on the drive mode. By maintaining the engine at optimal rotation speeds during two-wheel drive operation, the system reduces vibration while still delivering adequate drive force when needed
2Use of energy by moving object
If two-wheel drive traveling is used for fuel efficiency, then fuel consumption decreases, but engine vibration transmission increases when high drive force is required
Solution Approach 1:
The system dynamically switches between two-wheel drive and four-wheel drive modes based on actual road conditions and vehicle requirements. During normal conditions, two-wheel drive maintains fuel efficiency, while during high-demand conditions, four-wheel drive is activated to reduce engine load and vibration
Solution Approach 2:
The patent applies partial action by using only the necessary drive force for current conditions. Instead of always operating the engine at high output, the system uses minimal drive force (two-wheel drive) when sufficient, and only engages the full four-wheel drive capability when actually needed, thereby reducing overall vibration exposure
Data Source
AI summary
When a required drive force of an engine becomes equal to or greater than a predetermined value that deteriorates the characteristics of an engine mount, torque serving as a required drive amount of a rear electric motor is increased, so that the required drive force of the engine can be reduced. As a result, crushing of the engine mount that supports the engine is reduced, so that engine vibration transmitted to a vehicle body via the engine mount can be reduced.