Vehicle Control Apparatus Anticipating Drive Source Speed for All-Wheel Transition
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Solution Overview
Problem
Existing vehicle control technologies fail to promptly adjust the rotation speed of the motor when transitioning from front-wheel or rear-wheel drive to all-wheel drive, leading to response delays and potential shocks during clutch engagement, especially on slippery road surfaces.
Innovation Solution
A control apparatus and method that anticipates changes in road conditions and vehicle stability by increasing the rotation speed of the drive source in advance, using external information to synchronize the motor speed with the wheel speed before clutch engagement, thereby preventing response delays and shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotation speed of the motor is increased in advance to prepare for all-wheel drive transition, then the responsiveness and vehicle stability are improved, but the risk of shocks during clutch engagement increases if the speed synchronization is not precise
Solution Approach 1:
The control apparatus increases the rotation speed of the drive source in advance based on predicted vehicle behavior unstableness, so that when clutch engagement occurs, the motor speed is already close to the target speed, reducing engagement time and improving responsiveness while maintaining synchronization accuracy
Solution Approach 2:
The system continuously monitors actual wheel rotation speeds and adjusts the drive source rotation speed dynamically to maintain synchronization, using feedback from speed sensors to prevent shocks during clutch engagement while achieving rapid all-wheel drive transition
2Reliability
If the clutch engagement is delayed until vehicle instability is detected, then shock prevention is improved, but the response time for stabilizing the vehicle deteriorates
Solution Approach 1:
The system performs preliminary speed synchronization by increasing the drive source rotation speed before clutch engagement is actually needed, based on prediction of upcoming vehicle behavior unstableness from external information, thereby reducing the time penalty while maintaining shock-free engagement
Solution Approach 2:
The control system dynamically adjusts the timing and rate of rotation speed increase based on real-time vehicle conditions and predicted road conditions, optimizing the balance between early preparation and precise synchronization to minimize response time while preventing shocks
3Productivity
If the rotation speed of the drive source is increased rapidly to reduce response delay, then the productivity and vehicle stability are improved, but the likelihood of generating shocks during clutch engagement increases
Solution Approach 1:
The system begins increasing rotation speed in advance based on predicted conditions, allowing for a controlled ramp-up that achieves rapid response without sudden speed changes that would cause shocks during clutch engagement
Solution Approach 2:
The control apparatus prepares the drive source by gradually increasing rotation speed before clutch engagement, cushioning the transition to prevent shocks while still achieving rapid all-wheel drive activation when vehicle instability is detected
Data Source
AI summary
A control apparatus for a vehicle includes: a decider; and a rotation speed controller. The decider is configured to decide on a basis of a traveling state of the vehicle that a wheel which is spun is coupled to a drive source to increase a number of driving wheels. The rotation speed controller is configured to decide increase a rotation speed of the drive source in advance in accordance with an information of a vehicle behavior unstableness degree which is acquired from an outside of the vehicle before the wheel is coupled to the drive source.