Regenerative Brake Control Device Reducing Switching Frequency
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Solution Overview
Problem
Frequent switching between regenerative braking restricted and unrestricted states in hybrid and electric vehicles degrades driving performance due to loss or excessive braking.
Innovation Solution
A regenerative coordination brake control device that minimizes switching between regenerative braking prohibition and removal states by using a separate ECU to determine driver intent through accelerator position, vehicle speed, and torque, ensuring regenerative braking is only restricted when necessary conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If regenerative braking is frequently switched between restricted and unrestricted states based on wheel speed differential, then braking control precision is improved, but driving performance deteriorates due to loss or excessive braking
Solution Approach 1:
The patent changes the control parameter from wheel speed differential to driver operation state (accelerator depression). By monitoring whether the accelerator is depressed or not, the system determines when to restrict regenerative braking, avoiding frequent switching based on transient wheel speed variations while maintaining braking precision through driver intent recognition.
2Ease of operation
If regenerative braking restriction is removed to improve driving performance, then braking smoothness is improved, but braking control reliability deteriorates when wheel speed differential exceeds threshold
Solution Approach 1:
The system implements feedback control by continuously monitoring accelerator depression state and adjusting regenerative braking restriction accordingly. When the accelerator is not depressed, regenerative braking is restricted to prevent excessive braking; when the accelerator is depressed, restriction is removed to improve smoothness. This closed-loop feedback ensures both reliability and smoothness are maintained.
Data Source
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AI summary
Provided is a regenerative coordination brake control device that reduces the frequency of switching regenerative braking between a restricted state, in which regenerative braking is prohibited or suppressed, and a restriction removed state, in which the restriction on regenerative braking is removed. A regenerative coordination brake control device 91 includes a regeneration restriction condition determiner 92, which outputs a regeneration restriction signal S1 when determining that a restriction condition for prohibiting or suppressing regenerative braking is met, an acceleration operation detector 93, which outputs a regeneration restriction removal signal S2 when detecting an acceleration of the vehicle, and a regeneration restriction removal determiner 94, which determines whether a restriction on regenerative braking of the vehicle that is in the restricted state is to be continuously imposed or removed using the regeneration restriction removal signal S2 and the regeneration restriction signal S1. To determine whether regenerative braking in the restricted state of due to the regeneration restriction signal S1 is to be released from the restriction, the regeneration restriction removal determiner 94 determines that the restriction on regenerative braking is to be continuously imposed even without an output of the regeneration restriction signal S1, and the regeneration restriction removal determiner 94 determines that the restriction on regenerative braking is to be removed on condition that the regeneration restriction removal signal S2 is output.