Coil-Spring Brake Pedal Emulator for e-Boost Force Feedback
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Solution Overview
Problem
The transition to e-boost braking systems reduces the need for mechanical braking by operators, but there is still a requirement for resistive feedback when the brake pedal is depressed to indicate the applied braking force.
Innovation Solution
A pedal emulator assembly that includes a pedal arm, a housing with cradles and springs, and an end cap, which generates force feedback through the compression of springs when a load is applied to the pedal arm, simulating the resistance felt in a hydraulic braking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If e-boost braking system is used to reduce mechanical braking by operator, then braking efficiency is improved, but operator feedback on braking force is lost
Solution Approach 1:
The patent implements a feedback mechanism by incorporating springs that provide resistive force to the pedal arm. This resistance gives the operator tactile feedback about the braking force being applied, even though the actual braking is performed by the e-boost system. The springs create a force feedback loop that informs the operator of the system's response to their input.
Solution Approach 2:
The springs act as an intermediary element between the operator's foot input and the e-boost braking system. They provide a mechanical interface that translates the operator's pedal depression into a form that can be sensed through resistance, bridging the gap between the automated braking system and the operator's need for feedback.
2Loss of information
If passive force emulator is added to provide haptic feedback, then operator feedback is improved, but device complexity increases
Solution Approach 1:
The spring-based force emulator is a passive system that automatically provides feedback without requiring active control or additional power sources. The springs self-generate the resistive force based on their mechanical properties and the pedal position, eliminating the need for complex active feedback control systems.
Solution Approach 2:
The patent uses simple, inexpensive spring elements rather than complex electronic or active mechanical systems to provide the feedback. These springs are basic mechanical components that are cost-effective and reliable, avoiding the need for sophisticated sensors, actuators, or control electronics.
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 emulator assembly provides a haptic feel to the operator, allowing them to sense the extent of braking force applied, effectively addressing the need for resistive feedback in e-boost braking systems.
Implementation Method 1
at least a compression energy by the first pair of springs generates a first force feedback onto the pedal arm
Implementation Method 2
a first pair of coil springs positioned to extend within the second cavity
Data Source
AI summary
The present disclosure is directed to a pedal assembly that includes a pedal arm configured to move based on a load applied thereon and a housing that includes a first housing member having a first cavity and a pushrod operably connected to the pedal arm and to the first housing member. A first cradle positioned within the first cavity. The first cradle includes a second cavity. A first pair of springs positioned to extend within the second cavity. A second housing member having a third cavity. A second pair of springs positioned to extend within the second cavity and the third cavity. When a first predetermined load is applied to the pedal arm, the pushrod moves which drives the first cradle against the first pair of springs such that at least a compression energy by the first pair of springs generates a first force feedback onto the pedal arm.