Non-Hydraulic Pedal Simulator With Sequential Reaction Force Build-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic brake systems experience degraded pedal feeling during regenerative braking, leading to inconsistencies between driver input and brake pad pressure, potentially causing safety issues and frequent consumable part replacement.
Innovation Solution
A non-hydraulic pedal simulator that generates pedal force without hydraulic pressure, using a housing part, piston part, mounting reaction part, support reaction part, and moving reaction part, along with a magnetic force generator and position detector, to sequentially increase reaction forces and mimic the brake feeling of a hydraulic booster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic pressure is used in brake systems, then brake force can be generated, but pedal feeling is degraded during regenerative braking
Solution Approach 1:
The brake system is segmented into two independent force generation paths: a hydraulic pressure generation unit for generating brake force, and a pedal simulator unit for generating pedal reaction force. This segmentation allows each unit to be optimized independently - the hydraulic unit for brake force and the pedal simulator for pedal feeling, resolving the contradiction between brake force generation and pedal feeling maintenance.
Solution Approach 2:
The pedal simulator acts as an intermediary between the driver's pedal input and the hydraulic brake system. It generates a reaction force that mimics the expected hydraulic booster feedback, mediating the interaction between the driver and the actual brake system while maintaining natural pedal feeling even when hydraulic pressure changes occur during regenerative braking.
2Productivity
If hydraulic pressure changes during regenerative braking, then regenerative braking is achieved, but inconsistency between driver input and brake pad pressure occurs
Solution Approach 1:
The pedal simulator incorporates a reaction force generation unit that provides real-time feedback to the driver through the brake pedal. This feedback mechanism compensates for changes in hydraulic pressure during regenerative braking, maintaining consistent perceived braking force and ensuring the driver's input remains consistent with the actual brake pad pressure applied.
3Reliability
If hydraulic pressure is used, then brake system function is achieved, but safety accidents may occur due to degraded pedal feeling
Solution Approach 1:
The pedal simulator provides beforehand cushioning by pre-establishing a reliable reaction force generation mechanism that compensates for potential hydraulic system failures or anomalies. This protective layer ensures that even if the hydraulic system malfunctions, the driver receives appropriate feedback through the pedal, preventing safety accidents caused by degraded pedal feeling.
4Power
If hydraulic pressure dependency exists, then brake force generation is efficient, but frequent consumable part replacement is required
Solution Approach 1:
The pedal simulator extracts the pedal feeling generation function from the hydraulic brake system. By separating the reaction force generation task from the hydraulic pressure system, the simulator reduces the workload and stress on hydraulic components and consumable parts like brake pads, thereby extending their lifespan while maintaining efficient brake force generation through the hydraulic unit.
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 non-hydraulic pedal simulator provides a consistent brake feeling similar to hydraulic boosters, reducing the risk of safety accidents and consumable part wear by eliminating hydraulic pressure dependency.
Implementation Method 1
a moving spring part disposed between the moving support part and the support reaction part, and configured to support the moving support part by using a spring force
Implementation Method 2
made of an elastic material
Data Source
AI summary
A non-hydraulic pedal simulator may include: a housing part; a piston part inserted into the housing part, and moveable in connection with a pedal rod part; a mounting reaction part mounted on the piston part; a support reaction part inserted into the housing part, disposed on a moving path of the mounting reaction part, and configured to support the mounting reaction part; and a moving reaction part disposed between the piston part and the support reaction part, configured to elastically support the piston part, and supported by the support reaction part while being moved by the piston part.