Vehicle Orientation Control Device Slope Start Pitching
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Solution Overview
Problem
When a vehicle is braked on an uphill slope, the pitching motion can cause a change in the wheelbase, leading to sudden changes in vehicle orientation upon starting, which can be uncomfortable for occupants and generate noise.
Innovation Solution
A vehicle control device that controls the drive and braking systems by decreasing the braking force of the front and rear wheels while increasing the drive force to maintain the vehicle's stop state, and subsequently increasing the braking force after the drive force is adjusted, to stabilize the wheelbase and prevent sudden orientation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking force is applied to stop the vehicle on a slope, then the vehicle can be stopped effectively, but the suspension contracts and extends causing wheelbase change and sudden orientation change upon starting
Solution Approach 1:
The control device performs preliminary action by increasing drive force before releasing braking force. This pre-adjustment of the suspension state prevents sudden wheelbase changes when braking is released, as the suspension is already in a stabilized position due to the prior drive force application.
Solution Approach 2:
The control device applies preliminary anti-action by using drive force to counteract the suspension contraction caused by braking. By increasing drive force before braking release, the system creates an opposing force that prevents the suspension from suddenly returning to its original state, thereby preventing sudden orientation changes.
2Reliability
If braking force is applied to stop the vehicle, then the vehicle can be held stationary, but the suspension operation causes sudden orientation change and noise when braking is released
Solution Approach 1:
The control device performs preliminary action by adjusting drive force before releasing braking force. This ensures the suspension is already stabilized in a neutral position, preventing sudden movements that would cause noise and occupant discomfort when braking is released.
Solution Approach 2:
The control device converts the potentially harmful sudden suspension rebound into a beneficial controlled transition. By using drive force to pre-position the suspension, the system transforms what would be a harmful sudden movement into a smooth, controlled transition that eliminates noise and discomfort.
3Reliability
If braking force is applied to the wheels, then the vehicle can be stopped, but the friction force regulates suspension operation causing wheelbase change
Solution Approach 1:
The control device performs preliminary action by increasing drive force before releasing braking force. This pre-adjustment prevents the suspension from suddenly contracting and changing wheelbase length when braking is released, as the suspension is already in a stabilized position.
Solution Approach 2:
The control device applies parameter changes by modifying drive force levels to control suspension position. By adjusting the drive force parameter before braking release, the system changes the suspension's mechanical state to prevent sudden wheelbase length changes.
Data Source
AI summary
An orientation control device serving as a control device includes: an orientation control unit configured to, in a case where a vehicle is stopped on a slope road by applying braking force to a front wheel and a rear wheel, instruct a braking device to decrease front wheel braking force and rear wheel braking force and execute orientation control for instructing a drive device to increase drive force of the vehicle in a range in which a stop state of the vehicle is maintained; and a braking increase instruction unit configured to execute braking increase control for instructing the braking device to increase the braking force of at least one of the front wheel and the rear wheel after the increase in the drive force of the vehicle in accordance with the execution of the orientation control is ended.