Brake Pedal Stroke Control for One-Pedal Deceleration Feel
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Solution Overview
Problem
Drivers experience discomfort when operating the brake pedal in vehicles equipped with braking/driving force control systems that generate deceleration before the brake pedal is operated, due to pre-existing deceleration forces generated by the accelerator pedal's operation.
Innovation Solution
A method and device that detect the accelerator pedal stroke amount, calculate and control driving and deceleration forces, and adjust the brake pedal stroke amount based on the calculated deceleration force, ensuring consistent deceleration torque generation regardless of one-pedal control, thereby reducing driver discomfort and optimizing regenerative energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If deceleration driving force is generated when accelerator stroke amount is small, then energy recovery efficiency is improved, but driver comfort deteriorates due to unexpected deceleration before brake pedal operation
Solution Approach 1:
The system performs preliminary action by controlling the brake stroke amount in advance based on the calculated deceleration driving force before the driver operates the brake pedal. This preliminary control of brake pedal position ensures that when the driver presses the brake pedal, the expected deceleration is achieved without unexpected additional deceleration, thus maintaining driver comfort while enabling energy recovery through deceleration driving force generation
Solution Approach 2:
The system implements feedback by continuously monitoring the accelerator stroke amount, calculating the required deceleration driving force, and adjusting the brake stroke amount accordingly. This closed-loop feedback mechanism ensures that the brake pedal position is dynamically adjusted to match the actual deceleration needs, preventing driver discomfort while maximizing energy recovery efficiency
2Ease of operation
If brake stroke amount is controlled according to calculated deceleration driving force, then driver comfort is improved by eliminating unexpected deceleration, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The system merges the brake control function with the existing accelerator pedal detection and driving force calculation systems. By integrating the brake stroke amount control into the existing control architecture that already monitors accelerator stroke and calculates driving forces, the system achieves improved driver comfort without proportionally increasing device complexity, as it leverages existing sensors and processors
Data Source
AI summary
A braking/driving force control method includes detecting an accelerator stroke amount being the stroke amount of an accelerator pedal, calculating a driving force to be generated by a vehicle driving force source when the accelerator stroke amount is larger than a predetermined first stroke amount, calculating a deceleration driving force to be generated by the vehicle driving force source when the accelerator stroke amount is smaller than a second stroke amount set to a value smaller than or equal to the first stroke amount, controlling the vehicle driving force source to generate the calculated driving force and deceleration driving force, and generating a braking force on wheels according to a depressing operation of a brake pedal by a driver and controlling a brake stroke amount being the stroke amount of the brake pedal according to the calculated deceleration driving force.