Braking Control Device Slip Prediction Delay
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Solution Overview
Problem
Conventional braking control systems fail to provide sufficient time for occupants to operate the main braking device when switching to the second braking device, especially in situations where slipping is likely due to low friction or steep grades, leading to potential vehicle instability and safety concerns.
Innovation Solution
A braking control device that predicts the slip degree by assessing road conditions and delays the reduction of the main braking device's braking force as the slip degree increases, ensuring sufficient time for occupants to intervene before switching to the second braking device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the main braking device is switched to the second braking device when the host vehicle is held in a stopped state, then the durability of the pump is improved, but the vehicle stability deteriorates in situations where slipping is likely to occur
Solution Approach 1:
The control device changes the parameter of braking force reduction timing based on the predicted slip degree. When slip is predicted (low friction or steep grade), the main braking device maintains braking force longer before switching to the second braking device, thus preventing vehicle slip while still allowing pump durability improvement over time.
2Speed
If the main braking device is switched to the second braking device in emergency release situations, then the system response speed is improved, but the occupant reaction time deteriorates
Solution Approach 1:
The control device performs preliminary action by predicting slip degree before emergency release occurs. When slip is predicted, the system prepares by delaying the braking force reduction timing, ensuring that even if emergency release occurs, the occupant has sufficient time to react and operate the main braking device.
3Speed
If the braking force of the main braking device is reduced immediately when switching to the second braking device, then the switching speed is improved, but the occupant's ability to operate the main braking device deteriorates
Solution Approach 1:
The control device makes the braking force reduction timing dynamic rather than fixed. Based on the predicted slip degree, the system dynamically adjusts when to reduce braking force - delaying it when slip is predicted and maintaining faster reduction when slip is not predicted, thus balancing switching speed with occupant operation capability.
Data Source
AI summary
A braking control device is provided to automatically control a main braking device normally used to brake a host vehicle during travel and a second braking device used to maintain the host vehicle in a stopped state. The braking control device has a slip degree prediction unit and a braking device switching unit. The slip degree prediction unit predicts a possibility that the host vehicle will slip. The braking device switching unit is configured to delay a timing with which to start a reduction in a braking force of the main braking device if the slip degree prediction unit predicts a slip when switching the main braking device to the second braking device.