Electric Parking Brake Shift Position Detection Logic
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Solution Overview
Problem
Existing electric parking brake systems cannot automatically release the brake during shifting operations when the electric motor is prohibited, such as during the initial check period after the ignition is turned on, leading to potential delays or failures in brake release.
Innovation Solution
The system incorporates an after-permission brake release unit that determines the shift position change and permits the electric motor operation only after the initial check is completed, allowing for automatic brake release when the shift position is changed from a standstill to a moving position, using a shift position sensor and maintaining mechanism to ensure brake release even when the electric motor is initially prohibited.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor operation is prohibited during the initial check period, then system safety is improved, but the brake release function is delayed or failed
Solution Approach 1:
The control unit stores the shift position information during the initial check period when the electric motor operation is prohibited. This preliminary recording of the shift position enables the system to execute the brake release function immediately once the motor operation is permitted, resolving the contradiction between safety during initial check and timely brake release.
2Speed
If the brake release is triggered immediately upon shift position change, then responsiveness is improved, but system reliability deteriorates due to premature operation
Solution Approach 1:
The control unit records the shift position change during the initial check period before the electric motor operation is permitted. This preliminary detection and storage of the shift position enables the system to maintain high responsiveness while ensuring the motor operation only occurs after the initial check is completed, thus resolving the contradiction between responsiveness and reliability.
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
Enables reliable and timely automatic release of the parking brake when the vehicle is shifted from a standstill to a moving position, ensuring driver safety and system functionality even during prohibited electric motor operations.
Implementation Method 1
a motion conversion mechanism that converts the rotation of a rotating shaft of the electric motor into the linear motion of an output member of the motion conversion mechanism
Implementation Method 2
a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face of the rotating body
Data Source
AI summary
In an electric parking brake system, a first position (Park) is tentatively determined and also finally determined before the initial check is completed. Even when a second position is tentatively determined before the initial check is completed, the second position is finally determined after the initial check is completed. Then, a determination that the shift position has been changed is made. When a release command is issued based on the determination that the shift position has been changed, an electric motor is operated to release parking brakes.