Brake Booster Electromagnet Control for Sensitive Brake Prevention
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Solution Overview
Problem
Vehicle brake systems experience sensitive brake effects due to increased humidity at night, leading to excessive braking force, which degrades ride quality and poses collision risks, and existing solutions are costly and difficult to implement effectively.
Innovation Solution
A method and apparatus that detect outdoor temperature, relative humidity, and parking time to determine sensitive brake conditions, reducing the braking force by using an electromagnet and permanent magnet arrangement in the brake booster to decrease the jump-in braking force when the brake pedal is applied, and controlling the solenoid IV valve to maintain reduced braking pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system operates normally after parking during night time, then the braking force is generated based on friction material characteristics, but the humidity of friction material increases causing abnormal friction coefficient increase and excessive braking force (sensitive brake effect)
Solution Approach 1:
The system performs preliminary detection of sensitive brake conditions by measuring outdoor temperature, relative humidity, and parking time before braking occurs. When conditions indicate high risk of sensitive brake (low temperature, high humidity, long parking duration), the system pre-adjusts the braking force by controlling the electromagnet to reduce the jump-in section braking force, preventing excessive braking before it happens.
Solution Approach 2:
The system changes the braking force parameter dynamically based on environmental conditions. By adjusting the current to the electromagnet, the system modifies the braking force in the jump-in section, reducing it from normal levels to prevent the sensitive brake effect while maintaining adequate braking capability when needed.
2Object-affected harmful factors
If heating substances are added to the brake system to remove moisture from friction material, then the sensitive brake effect can be prevented, but the manufacturing cost increases and installation becomes difficult
Solution Approach 1:
The invention replaces the mechanical/thermal approach of using heating substances with an electromagnetic control system. Instead of physically removing moisture through heating, the system uses an electromagnet to detect and control the braking force in the jump-in section, substituting a complex thermal system with a simpler electromagnetic control mechanism.
3Object-affected harmful factors
If a control device for distributing braking force is added to re-adjust friction force, then the sensitive brake effect can be controlled, but the manufacturing cost increases and the control device requires additional management and maintenance
Solution Approach 1:
The electromagnet serves multiple functions: it acts as both a sensor for detecting braking conditions and as an actuator for controlling braking force. This multi-functionality eliminates the need for separate control devices, reducing system complexity while maintaining the ability to adjust friction force and prevent sensitive brake effects.
4Object-affected harmful factors
If the jump-in braking force is reduced in sensitive brake environments, then the excessive braking force is prevented and ride quality improves, but the braking performance may be reduced in normal conditions
Solution Approach 1:
The system applies different braking force characteristics to different sections of the braking process. Specifically, it modifies only the jump-in section (initial contact phase) braking force while maintaining normal braking force for subsequent steady-state braking. This localized adjustment prevents excessive braking force during the critical initial phase without compromising overall braking performance.
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
Prevents excessive braking force generation, ensuring safe driving conditions and comfortable ride quality by reducing the jump-in braking force by up to 30% in sensitive brake environments, without the need for additional heating substances or complex control devices.
Implementation Method 1
A method and apparatus that detect outdoor temperature, relative humidity, and parking time to determine sensitive brake conditions, reducing the braking force by using an electromagnet and permanent magnet arrangement in the brake booster to decrease the jump-in braking force when the brake pedal is applied
Implementation Method 2
a pad generating frictional force while being in close contact with a disk
Data Source
AI summary
A method of preventing a sensitive brake for preventing an excessive brake of a vehicle may include measuring conditions for determining a sensitive brake environment of a vehicle, terminating a brake when the conditions measured do not correspond to a preset sensitive brake environment, and when the conditions correspond to the sensitive brake environment, controlling a brake apparatus of the vehicle to be operated in a sensitive brake preventing mode, executing a first brake in a sensitive brake mode, comparing whether a value of an index of deceleration to a pedal effort at the first brake executed in the sensitive mode is larger than a predetermined value, and terminating the brake when the value of the index is smaller than the predetermined value, and repeatedly performing the brake in the sensitive brake mode when the value of the index is larger than the predetermined value.