Brake Control Apparatus Managing Pedal Reaction Force
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Solution Overview
Problem
In brake-by-wire systems, the vehicle ride quality and pedal feeling during deceleration are heavily dependent on the driver's input, leading to increased driver burden, especially during simultaneous brake and steering operations like curve deceleration, as the pedal reaction force mechanism does not effectively manage deceleration feeling.
Innovation Solution
A brake control apparatus with a pedal reaction force creating mechanism that generates a consistent pedal reaction force and adjusts brake force based on predetermined deceleration and pedal characteristics, using a motor-driven actuator, ECU, and sensors to calculate target deceleration and control pedal feedback, thereby reducing driver burden and improving pedal feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If brake-by-wire system is used to interrupt vibration transmission and vary brake force, then brake force control flexibility is improved, but driver burden increases during simultaneous brake and steering operations
Solution Approach 1:
The patent applies feedback by detecting actual deceleration via acceleration sensors and comparing it with target deceleration, then adjusting brake force accordingly. This closed-loop control enables the system to automatically adapt to driving conditions, reducing driver burden while maintaining flexible brake force control during simultaneous brake and steering operations
Solution Approach 2:
The patent replaces the mechanical pedal reaction force transmission system with an electronic control system using motors and sensors. This substitution allows independent control of brake force and pedal reaction force, providing flexible brake control while reducing driver burden by eliminating the need for precise mechanical pedal modulation during combined operations
2Ease of operation
If pedal reaction force is varied to improve pedal feeling, then pedal feeling is improved, but deceleration feeling becomes dependent on driver skill
Solution Approach 1:
The system uses acceleration sensors to detect actual deceleration and feeds this information back to the control unit, which adjusts brake force to match target deceleration. This feedback mechanism ensures consistent deceleration feeling independent of driver skill while maintaining appropriate pedal reaction force characteristics
Solution Approach 2:
The patent independently controls pedal reaction force parameters separate from brake force parameters. The pedal reaction force is adjusted based on pedal position and driving conditions to provide good pedal feeling, while brake force is independently controlled based on target deceleration to ensure consistent deceleration feeling regardless of driver skill level
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively maintains a consistent brake force and pedal reaction force, enhancing deceleration feeling and reducing driver workload by automatically adjusting pedal feedback, allowing for comfortable deceleration control without requiring high driver skill.
Implementation Method 1
a motor-driven actuator (1) which generates a fluid pressure for assisting a brake
Implementation Method 2
a deceleration |detection portion (30) which detects actual deceleration
Data Source
AI summary
Disclosed is a brake control apparatus which includes a brake booster for augmenting deceleration, and which addresses the problem in conventional brake control apparatuses that deceleration and pedal reaction force depend on driver brake pedal input, and thus the pedal response and the ride comfort from the feeling of deceleration are affected by the manner in which the brake pedal is actuated by the driver. The brake control apparatus comprises a pedal reaction force generation unit for generating a pedal reaction force on the brake pedal, and a brake control unit for controlling the brake force in such a way as to suppress driver brake input fluctuations, wherein the pedal reaction force generation unit suppresses pedal reaction force fluctuations in accordance with specific deceleration and pedal reaction force characteristics. The brake control apparatus further comprises a calculation unit for calculating a target deceleration on the basis of lateral jerk information in the left-to-right direction of the vehicle, wherein the brake control unit suppresses the brake force in such a way that the target deceleration is produced and, when the amount by which the brake pedal is depressed reaches a specific amount in respect of the target deceleration, the pedal reaction force generated by the pedal reaction force generation unit may be increased.