Braking Control Device for Vehicle Stability and Comfort
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Solution Overview
Problem
Existing braking control devices prioritize antiskid control over pitching suppression control, leading to sudden changes in vehicle comfort and stability during braking.
Innovation Solution
A braking control device with a first control unit that reduces target braking force when vehicle instability is detected and a second control unit that adjusts the rate of increase in braking force to maintain stability and comfort by executing specific control prior to antiskid control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antiskid control is preferentially executed during braking, then vehicle stability is secured, but comfort in the vehicle is likely to suddenly change
Solution Approach 1:
The control device executes preliminary action by prioritizing antiskid control to secure wheel traction before implementing pitching suppression control. This sequential approach ensures that stability requirements are met first, then comfort optimizations are applied, preventing sudden comfort changes while maintaining vehicle stability throughout the braking process
2Ease of operation
If target braking force is increased to execute pitching suppression control, then ride comfort is enhanced, but vehicle behavior becomes unstable
Solution Approach 1:
The control device applies dynamics by continuously adjusting the target braking force based on real-time vehicle state feedback. The pitching suppression control dynamically modifies braking force distribution between front and rear wheels according to actual deceleration rates and wheel slip conditions, enabling ride comfort enhancement while maintaining vehicle behavior stability through adaptive control
3Reliability
If antiskid control is executed preferentially, then wheel slip is controlled, but execution of specific control such as pitching suppression control is stopped
Solution Approach 1:
The control device executes antiskid control as a preliminary action to establish stable wheel traction conditions. Once wheel slip is controlled within acceptable ranges, the system transitions to pitching suppression control, allowing specific control effects to be sustained throughout the braking process rather than being interrupted by continuous antiskid intervention
4Reliability
If target braking force is reduced to maintain vehicle stability, then vehicle behavior stability is maintained, but sudden change in specific control effects occurs
Solution Approach 1:
The control device employs dynamic adjustment of target braking force based on the vehicle's actual response to braking. When vehicle behavior becomes unstable, the system smoothly reduces target braking force while maintaining pitching suppression effects through continuous feedback control, avoiding sudden changes in control effects while preserving vehicle behavior stability
Data Source
AI summary
A braking control device includes a first control unit configured to execute first control for reducing a target braking force, which is either a front-wheel braking force to be applied to front wheels of a vehicle or a rear-wheel braking force to be applied to rear wheels during increasing of deceleration of the vehicle, in a case that a behavior of the vehicle is unstable as the target braking force is increased; and a second control unit configured to execute second control for reducing a rate of increase in the target braking force and increasing a rate of increase in the front-wheel braking force or the rear-wheel braking force, which is not the target braking force, prior to execution of the first control.