Electric Vehicle Parking Brake Lock Mechanism Impact Control
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Solution Overview
Problem
Conventional electric braking devices for vehicles face challenges in minimizing impact loads during engagement in the lock mechanism and extending the time from the start of power reduction control to engagement, leading to either high impact loads or prolonged engagement times.
Innovation Solution
The electric braking device incorporates a control means that performs power supply amount reduction control with a first period of high gradient followed by a second period of low gradient, utilizing hysteresis characteristics to manage the power supply and movement speed, ensuring minimal impact loads and shortening the engagement time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the reduction gradient of the power supply amount is high, then the movement speed of the power transmitting member is high and the engagement time is short, but a relatively large impact load is generated on the engaged parts
Solution Approach 1:
The power supply amount reduction process is divided into two distinct stages: a first stage with a higher reduction gradient for rapid initial reduction, and a second stage with a lower reduction gradient for controlled final engagement. This segmentation allows the system to achieve both short engagement time and low impact load by optimizing each stage's reduction rate appropriately.
Solution Approach 2:
The reduction gradient of the power supply amount is made dynamic rather than constant. The control means adjusts the reduction gradient based on the engagement progress, using a higher gradient initially and then switching to a lower gradient as engagement approaches, thereby optimizing both time and impact load characteristics throughout the engagement process.
2Object-affected harmful factors
If the reduction gradient of the power supply amount is low, then the movement speed of the power transmitting member is low and the impact load is reduced, but the engagement time becomes long
Solution Approach 1:
The power supply amount reduction process is divided into two distinct stages: a first stage with a higher reduction gradient for rapid initial reduction, and a second stage with a lower reduction gradient for controlled final engagement. This segmentation allows the system to achieve both short engagement time and low impact load by optimizing each stage's reduction rate appropriately.
Solution Approach 2:
The reduction gradient of the power supply amount is made dynamic rather than constant. The control means adjusts the reduction gradient based on the engagement progress, using a higher gradient initially and then switching to a lower gradient as engagement approaches, thereby optimizing both time and impact load characteristics throughout the engagement process.
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 effectively reduces impact loads on engaged parts while maintaining a short time from the start of power reduction control to engagement, ensuring efficient and safe operation of the parking brake function.
Implementation Method 1
utilizing hysteresis characteristics to manage the power supply and movement speed
Data Source
AI summary
This electric braking device transmits power generated by an electric motor to a pressing member and causes pressing force to be generated by the pressing member with respect to a friction member. The electric braking device includes a lock mechanism. A locked state (in which movement of a locked section in a direction in which pressing force decreases is impossible) is achieved in the lock mechanism by: performing “supplied power amount reduction control” in which the amount of power supplied to the electric motor is reduced while a locking member is maintained in a lockable position; causing the locked section to move in the direction in which pressing force decreases; and causing the locking member and the locked section to engage. When performing supplied power amount reduction control, the amount of power supplied is first reduced by a large reduction gradient and then reduced by a small reduction gradient.