Parking Brake Hold Control for Smooth P-Gear Engagement
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Solution Overview
Problem
During the process of shifting the transmission gear to the P stage for parking, vehicles may experience an impact due to the delay between the driver releasing the brake pedal and the actual completion of the transmission, especially on inclined roads, causing discomfort to the driver.
Innovation Solution
A parking assistance system that includes an electronic parking brake and a processor to maintain braking force using the main brake for a preset time, adjusting based on the engagement of the electronic parking brake and the target transmission gear, ensuring the braking force is released only when the P stage is completed or the preset time is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driver releases the brake pedal immediately after shifting to P stage, then the parking operation is completed quickly, but an impact occurs on the vehicle due to the delay in transmission completion
Solution Approach 1:
The system performs preliminary action by detecting when the brake pedal is released and the transmission gear is shifted to P stage, then proactively maintains braking force through the electronic parking brake for a predetermined time period before the transmission actually completes the shift. This preliminary maintenance of braking force prevents the vehicle impact that would otherwise occur when the transmission finally engages, while allowing the driver to complete the parking operation quickly without waiting for the transmission to finish.
2Object-affected harmful factors
If the braking force is maintained for a longer duration, then the vehicle impact is prevented, but the braking system operates for extended time consuming more energy
Solution Approach 1:
The system applies parameter changes by dynamically adjusting the duration of electronic parking brake operation based on the actual transmission shift completion time. Rather than using a fixed long duration, the controller maintains the electronic parking brake for a predetermined time period that is calculated based on the delay between the driver's P stage input and the actual transmission completion. This optimized time parameter prevents vehicle impact while minimizing unnecessary energy consumption from prolonged brake operation.
Data Source
AI summary
Disclosed herein is a parking assistance system including an electronic parking brake associated with at least one wheel of a vehicle, a parking brake drive circuit configured to control the electronic parking brake, and a processor configured to start braking control for maintaining a braking force applied by a main brake based on input information of a transmission gear and information of whether the vehicle is braking and stopping, wherein a duration of the braking control for maintaining the braking force applied by the main brake is shorter than or equal to a preset first time, and control the braking force applied by the main brake to be released based on whether the electronic parking brake is engaged or whether a target transmission gear is changed, and it is possible to minimize an impact caused by transmission by maintaining the braking force applied by the main brake for a predetermined time when performing parking gear transmission.