Optimizing Regenerative Brake Systems with Adaptive Torque Control
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Summary
Problems
Existing regenerative braking systems in vehicles face limitations in regenerative efficiency and driver feedback during transitions between regenerative and hydraulic braking, leading to suboptimal energy recovery and increased pollutant emissions.
Innovation solutions
A control device and method that enable 'force blending' and 'volume blending' in a braking system, allowing for consistent driver feedback and adaptive hydraulic braking torque adjustment based on generator braking torque, independent of brake booster operation, using a control application device to manage valve states and brake fluid displacement within the braking circuit.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the hydraulic braking torque is reduced or deactivated during regenerative braking, then regenerative efficiency is improved, but the driver experiences loss of brake master cylinder counterforce and degraded pedal feel
Why choose this principle:
The patent introduces a brake fluid displacement mechanism as an intermediary between the driver's brake pedal actuation and the wheel brake cylinders. During regenerative braking, the displaced brake fluid is redirected to a reservoir chamber instead of being transmitted to the wheels, while the reservoir chamber maintains pressure feedback to the master cylinder to preserve pedal feel.
Principle concept:
If the hydraulic braking torque is reduced or deactivated during regenerative braking, then regenerative efficiency is improved, but the driver experiences loss of brake master cylinder counterforce and degraded pedal feel
Why choose this principle:
The system dynamically changes the parameter of brake fluid pressure distribution by controlling the wheel outlet valves. During regenerative braking, the valves redirect brake fluid to the reservoir chamber, changing the pressure distribution parameters while maintaining the master cylinder counterforce through the reservoir chamber's pressure feedback.
Application Domain
Data Source
AI summary:
A control device and method that enable 'force blending' and 'volume blending' in a braking system, allowing for consistent driver feedback and adaptive hydraulic braking torque adjustment based on generator braking torque, independent of brake booster operation, using a control application device to manage valve states and brake fluid displacement within the braking circuit.
Abstract
A method for operating a regenerative braking system of a vehicle includes: applying control to at least one valve of a brake circuit, before and/or during operation of a generator of the braking system, so that brake fluid is displaced out of a brake master cylinder and/or out of the at least one brake circuit into at least one reservoir volume; defining a target force difference variable regarding a booster force exerted by a brake booster in consideration of at least one of a generator braking torque information item, a brake master cylinder pressure variable, and an evaluation variable derived from at least the generator braking torque information item or the brake master cylinder pressure variable; and controlling the brake booster in consideration of the defined target force difference variable.