Hydraulic Control for Regenerative Braking Responsiveness
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Solution Overview
Problem
In hybrid fuel cell vehicles, the slow responsiveness of hydraulic braking force compared to regenerative braking force leads to non-uniform total braking force, causing frequent deceleration changes due to the slow adjustment of hydraulic braking force in response to changes in regenerative braking torque.
Innovation Solution
A hydraulic control method that predicts the point in time when regenerative braking torque starts to decrease and initiates hydraulic control prior to this point, using a hydraulic braking control unit to generate a hydraulic control start signal and adjust hydraulic braking force accordingly, ensuring faster responsiveness to regenerative braking torque changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic braking force is used to supplement regenerative braking force, then total braking force is sufficient to satisfy driver's braking intention, but hydraulic braking force has slow responsiveness compared to regenerative braking force, causing non-uniform total braking force and frequent deceleration changes
Solution Approach 1:
The hydraulic control unit predicts the point in time when regenerative braking torque starts to be reduced based on vehicle velocity, and starts hydraulic control in advance prior to this predicted point. This preliminary action ensures that hydraulic braking force is already adjusted when regenerative braking torque changes, maintaining uniform total braking force and eliminating deceleration changes.
2Adaptability or versatility
If regenerative braking torque is reduced at low velocity, then braking force distribution changes, but slow responsiveness of hydraulic braking force causes non-uniform total braking force and deceleration changes
Solution Approach 1:
The hydraulic control unit continuously monitors vehicle velocity and predicts the point in time when regenerative braking torque will be reduced. Based on this prediction, the system adjusts hydraulic braking force in advance, creating a feedback mechanism that maintains uniform total braking force despite changes in braking force distribution at different velocities.
Data Source
AI summary
A hydraulic control method of a regenerative braking system for vehicles in which a point of time when regenerative braking torque starts to be reduced is predicted and hydraulic control is performed in advance prior to this point of time so as to improve braking performance. A hydraulic braking control unit predicts the point of time when regenerative braking torque starts to be reduced based on vehicle velocity and starts hydraulic control in advance prior to this point of time, thereby improving responsiveness of hydraulic braking force compared to the regenerative braking torque to satisfy braking force required by a driver, and minimizing a deceleration change at the end of regenerative braking to improve braking performance.