Brake Control Device Positional Propeller Shaft Response
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Solution Overview
Problem
Existing electric parking brake (EPB) systems have slower response times compared to hydraulic brakes, and methods to improve hydraulic braking response, such as automatic pressurization, lead to increased power consumption, necessitating a solution to enhance both hydraulic and electric braking forces' responsiveness.
Innovation Solution
A brake control device that includes a controller for the electric brake system, which executes positional control of a propeller shaft to enhance the transmission of motor force to the braking member, thereby increasing the response speed of both hydraulic and electric braking forces, especially during emergency situations or hydraulic brake failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB is used to prevent unintentional movement of parked vehicles, then the parking function is reliable, but the response speed is slow compared to hydraulic brake
Solution Approach 1:
The controller executes positional control to move the propeller shaft toward the member-to-be-braked in advance when a predetermined condition is satisfied, so that when braking is actually needed, the braking member is already in a position closer to the member-to-be-braked, thereby reducing the response time while maintaining reliable parking function
2Speed
If automatic pressurization control is continuously executed to improve hydraulic braking response speed, then the response speed increases, but power consumption increases
Solution Approach 1:
Instead of continuously executing pressurization control, the system executes positional control only when a predetermined condition is satisfied, transforming continuous energy-consuming operation into periodic conditional operation, thereby reducing power consumption while maintaining improved response speed
3Speed
If the EPB response speed is increased for emergency and automatic driving situations, then the braking effectiveness during motion improves, but the complexity of the control system increases
Solution Approach 1:
The controller automatically determines when to execute positional control based on predetermined conditions without requiring complex external control systems, allowing the EPB to self-adjust its response characteristics based on operating conditions, thereby improving response speed while minimizing control system complexity
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 solution enables faster response times for both hydraulic and electric braking forces, reducing power consumption and improving safety by ensuring quicker braking engagement and release, even when the vehicle is in motion.
Implementation Method 1
an electric brake device that generates an electric braking force by pressing the braking member by driving a motor
Implementation Method 2
a hydraulic brake device that generates a hydraulic braking force by pressing a braking member with hydraulic pressure toward a member-to-be-braked
Data Source
AI summary
The present disclosure provides a brake control device applied to a vehicle including a hydraulic brake device that generates a hydraulic braking force by pressing a braking member with hydraulic pressure toward a member-to-be-braked that rotates integrally with a wheel; and an electric brake device that generates an electric braking force by pressing the braking member by driving a motor toward the member-to-be-braked. A controller that controls the electric brake device is provided. The controller executes, when a predetermined condition is satisfied, a positional control for driving a motor and moving a propeller shaft that transmits the driving force of the motor to the braking member toward the member-to-be-braked as compared to when the predetermined condition is not satisfied.