Front Wheel Braking Torque Coordination for Emergency Deceleration
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Solution Overview
Problem
Modern motor vehicle braking systems, even with advanced technologies, face challenges in achieving rapid and effective deceleration during emergency braking, often requiring oversized service brake systems and leading to potential weight and cost inefficiencies, as well as unnecessary wear on parking brakes due to infrequent emergency braking events.
Innovation Solution
A method that applies a first braking torque via the service brake system and a second braking torque via a distinct parking brake to the front wheel, simultaneously or sequentially, to enhance deceleration during emergency braking, while optimizing the use of both systems to prevent unnecessary wear and reduce system size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the service brake system is oversized to achieve rapid deceleration during emergency braking, then deceleration performance is improved, but vehicle weight and system cost increase
Solution Approach 1:
The patent combines the service brake system and parking brake system to work together during emergency braking. The parking brake, which uses a self-locking mechanism with mechanical advantage, is activated simultaneously with the service brake to provide additional braking torque, enabling rapid deceleration without requiring an oversized service brake system.
Solution Approach 2:
The parking brake system, traditionally designed only for stationary vehicle holding, is given a dual function by enabling its use during emergency braking maneuvers. This multi-functionality allows the existing parking brake components to contribute to emergency deceleration, eliminating the need for additional braking capacity in the service brake system.
2Speed
If the service brake system is oversized to achieve rapid deceleration during emergency braking, then deceleration performance is improved, but system cost increases
Solution Approach 1:
The patent merges the functionality of two existing brake systems (service brake and parking brake) to achieve emergency braking performance. By coordinating both systems, the patent utilizes already-manufactured components rather than requiring an expensive oversized service brake system, thereby reducing overall system cost while maintaining deceleration performance.
3Speed
If the parking brake is activated frequently for emergency braking, then deceleration effectiveness is improved, but wear on the parking brake increases
Solution Approach 1:
The control unit is configured to activate the parking brake only when emergency braking is detected, using preliminary detection of braking conditions. The system monitors brake pedal input and other parameters to determine when emergency braking is occurring, enabling selective activation of the parking brake only when necessary, thereby minimizing wear while maintaining deceleration effectiveness.
Solution Approach 2:
The parking brake is activated periodically or intermittently only during detected emergency braking events rather than continuously. This periodic activation pattern, controlled by the control unit based on real-time braking condition assessment, allows the parking brake to contribute to deceleration when needed while minimizing cumulative wear through reduced operational frequency.
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
This approach enables rapid and effective deceleration during emergency braking, reduces the need for oversized service brake systems, and minimizes unnecessary wear on the parking brake by activating it only when necessary, thereby saving weight and costs.
Implementation Method 1
the driver operates a brake pedal and, assisted by a brake booster, builds up hydraulic brake pressure, which is then applied via the service brakes to the respective wheels
Implementation Method 2
a first braking torque is applied to at least one front wheel of the motor vehicle by means of at least one service brake system
Implementation Method 3
An electric motor actuates a self-locking mechanism, which typically includes a spindle. This presses the brake pad of the service brake, corresponding to each wheel of the vehicle, against a brake disc
Implementation Method 4
The self-locking mechanism usually converts the rotary motion generated by the electric motor into a translational motion
Implementation Method 5
a second braking torque is applied to the at least one front wheel by at least one parking brake, distinct from the at least one service brake system, while the first braking torque is applied
Data Source
AI summary
The invention relates to a method for decelerating a motor vehicle (10) at least during emergency braking, in which method a first braking torque (B1) is applied to at least one front wheel (11) of the motor vehicle (10) by means of at least one service brake system (13) of the motor vehicle. According to the invention, at least one parking brake (14) different from the at least one service brake system (13) is activated by a control device (15) of the motor vehicle (10) and a second braking torque (B2) is thereby applied to the at least one front wheel (11) while the first braking torque (B1) is applied. A further aspect of the invention relates to a motor vehicle (10).