EPB Autohold Integration for Noise Reduction
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Solution Overview
Problem
Conventional mechanical park brake systems cause operational inconveniences for drivers, including potential slope sliding, engine flameout, and reduced driving comfort due to manual control requirements, and the Electrical Park Brake (EPB) systems generate noticeable drag, have long response times, and produce noise when releasing wheels.
Innovation Solution
An EPB system compatible with an autohold function, comprising an information collection unit, control unit, and execution unit, which collects and processes information to switch from a brake state to an autohold function, enabling stable vehicle starting by converting from rear-wheel to four-wheel braking, reducing noise, and improving driving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If EPB is used to brake rear wheels during vehicle starting, then the vehicle can be started with automated control, but drag feeling and noise are generated during wheel release
Solution Approach 1:
The system activates the autohold function before the EPB releases the brake, ensuring the brake is already engaged when the EPB motor stops. This preliminary action prevents the drag feeling and noise that occur when the EPB releases the brake during traditional starting operations
Solution Approach 2:
The autohold function serves as an intermediary system between the driver's starting action and the EPB brake release. It temporarily maintains brake pressure while the vehicle transitions from stationary to moving state, eliminating the harmful drag and noise effects
2Speed
If EPB releases rear wheels during vehicle starting on slope, then the vehicle can move forward, but pitching change occurs due to long response time
Solution Approach 1:
The autohold function is activated in advance before the EPB releases the rear wheels, ensuring continuous brake force is maintained during the transition. This preliminary action prevents the pitching change that would otherwise occur due to the EPB's long response time
Solution Approach 2:
The system maintains continuous brake force through the autohold function during the entire starting process, from EPB engagement to vehicle movement. This continuity eliminates the interruption in braking force that causes pitching and instability during wheel release
3Ease of operation
If manual control of park brake is used, then the driver can control braking, but operational inconveniences occur including slope sliding and engine flameout
Solution Approach 1:
The system automatically manages the brake release process during vehicle starting, eliminating the need for manual intervention. The control unit monitors vehicle conditions and autonomously controls the EPB and autohold functions, preventing slope sliding and engine flameout that occur with manual operation
Solution Approach 2:
The control unit continuously monitors vehicle conditions including accelerator openness and brake state, and adjusts the EPB and autohold functions accordingly. This feedback mechanism ensures reliable starting by preventing slope sliding and engine flameout that occur with manual control
Data Source
AI summary
Disclosed are an EPB compatible with an autohold function, a starting method and a vehicle. According to the EPB, during starting, by converting the vehicle from a brake state where the EPB acts into a brake state where an autohold function acts and enabling the vehicle to start from the brake state where the autohold function acts, the vehicle is started stably, the starting noise of the vehicle is reduced and the driving experience is improved.