Vehicle Braking Control Apparatus Regenerative Force Correction
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Solution Overview
Problem
The existing hydraulic braking systems in vehicles experience a delay in reducing hydraulic braking force in response to a reduction in brake operation amount, leading to decreased drivability due to the slower response speed of hydraulic braking compared to regenerative braking.
Innovation Solution
A braking control apparatus and method that includes an electronic control unit to adjust the regenerative braking force and driving force to compensate for the delay in hydraulic braking, ensuring a quicker reduction in braking force in response to brake operation changes, by executing a correction process that reduces regenerative braking force or increases driving force when hydraulic braking is slow to respond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the hydraulic braking system adjusts braking force through computing and hydraulic pressure adjustment, then the braking force can be precisely controlled, but the response speed decreases due to the computing process delay
Solution Approach 1:
The system pre-calculates the required hydraulic braking force based on the difference between target braking force and regenerative braking force before the driver releases the brake pedal. This preliminary calculation allows the hydraulic braking system to start reducing braking force immediately when the pedal is released, compensating for the inherent delay in hydraulic response and improving overall response speed while maintaining precise braking force control
2Adaptability or versatility
If the hydraulic braking force is reduced based on brake operation amount reduction, then the braking force adapts to driver input, but the deceleration reduction is delayed due to slow hydraulic response
Solution Approach 1:
The control unit determines in advance whether to reduce hydraulic braking force by comparing the brake operation amount change rate with a threshold value before the driver releases the pedal. This preliminary determination enables the system to proactively reduce hydraulic braking force when needed, reducing the time delay in deceleration reduction while maintaining adaptability to driver input through conditional response strategies
Solution Approach 2:
The system dynamically adjusts the braking force reduction strategy by monitoring the brake operation amount change rate and comparing it with a threshold. When the change rate exceeds the threshold, the system activates a faster reduction mode; otherwise, it maintains normal reduction. This dynamic adjustment optimizes both adaptability to driver intent and response speed across different driving scenarios
Data Source
AI summary
A braking control apparatus for a vehicle, the vehicle including a drive regeneration imparting device (10) and a hydraulic braking system (20), the drive regeneration imparting device being configured to impart a driving force or a regenerative braking force to the vehicle, the hydraulic braking system being configured to impart a hydraulic braking force to the vehicle by adjusting a hydraulic pressure in a wheel cylinder provided in a wheel, the braking control apparatus includes: an electronic control unit (100) configured to, when the hydraulic braking force is reduced based on a reduction in brake operation amount that is an operation amount of a brake operation member, execute a correction process, the correction process being a process of reducing the regenerative braking force that is being imparted to the vehicle by the drive regeneration imparting device.