Electric Parking Brake Clamping Force Compensation for Pad Burnishing
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Solution Overview
Problem
Existing electric parking brake (EPB) systems face challenges in maintaining a consistent clamping force during early stages of vehicle release or brake pad replacement, leading to potential vehicle slipping due to insufficient burnishing of brake pads.
Innovation Solution
The EPB system incorporates a controller that determines the burnishing state of the brake pads by analyzing driving distance and brake pad replacement information. Based on this determination, the controller compensates the target clamping force by increasing it when the vehicle is in the early stages of release or brake pad replacement, thereby preventing slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB uses a standard clamping force during parking operation, then the device complexity is reduced and ease of operation is improved, but the reliability deteriorates due to vehicle slipping when brake pads are insufficiently burnished
Solution Approach 1:
The controller performs preliminary determination of the burnishing state using driving distance and parking operation count before executing the parking brake operation. This allows the system to pre-adjust the clamping force based on predicted friction conditions, preventing vehicle slipping without requiring complex real-time feedback mechanisms during the actual parking operation.
Solution Approach 2:
The system dynamically changes the clamping force parameter based on the determined burnishing state. When the brake pads are determined to be insufficiently burnished, the controller increases the clamping force above the standard level. This parameter adjustment resolves the contradiction by adapting the force level to actual friction conditions without requiring fundamental changes to the brake mechanism structure.
2Reliability
If the EPB increases clamping force to compensate for low friction coefficient, then the reliability of parking is improved, but the use of energy increases due to higher motor power consumption
Solution Approach 1:
The system dynamically adjusts the clamping force based on the burnishing state determined from driving distance and parking operation count. The controller applies increased clamping force only when the brake pads are determined to be insufficiently burnished, and uses standard clamping force when sufficient burnishing is detected. This dynamic adaptation resolves the contradiction by applying additional energy only when necessary for reliability, rather than continuously.
3Force
If the EPB maintains standard clamping force, then the ease of operation is improved and control is simplified, but the friction coefficient between brake pads and brake disc is insufficient leading to vehicle slipping
Solution Approach 1:
The controller uses feedback from driving distance information and parking operation count to determine the burnishing state of the brake pads. This feedback mechanism allows the system to infer the friction coefficient condition without direct measurement, and accordingly adjusts the clamping force to maintain reliable parking performance while keeping the control logic relatively simple.
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 system effectively prevents vehicle slipping by ensuring a sufficient clamping force is maintained during early stages of vehicle release or brake pad replacement, thereby enhancing parking stability and safety.
Implementation Method 1
a Motor-On-Caliper (MOC) type of an EPB system increases a torque generated from an electric motor of the EPB through a reducer to generate a clamping force required for parking by a mechanical structure device inside a caliper
Implementation Method 2
press a pair of brake pads against a brake disk rotating together with a wheel of a vehicle by advancing a piston by an electric motor of the EPB during parking operation, thereby generating a clamping force
Data Source
AI summary
Disclosed herein an electric parking brake (EPB) system includes an EPB configured to provide a clamping force to a vehicle for parking; and a controller configured to engage the EPB; wherein the controller is configured to determine whether the vehicle is in an early stage of vehicle release or an early stage of brake pad replacement based on a driving distance and brake pad replacement information of the vehicle during a parking operation, and upon determining that the vehicle is in the early stages of vehicle release or brake pad replacement, compensate for a target clamping force of the EPB and perform the parking operation based on the compensated target clamping force.