Electronic Parking Brake Neutral Release During Ignition-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicles equipped with electronic transmissions and parking brakes face challenges in performing neutral parking when the engine is turned off, as they automatically shift to a parking position and engage the brake, making it difficult for drivers to exit a double-parked situation without manual intervention.
Innovation Solution
An electronic parking brake system with a controller that determines if the gear stage is shifted to neutral during ignition-off and releases the engagement of the electronic parking brake, allowing neutral parking by switching from a sleep mode to a wake-up mode upon receiving an N-stage signal, enabling the brake to be disengaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear stage automatically shifts to parking position and electronic parking brake is automatically engaged during ignition-off, then parking security is improved, but neutral parking capability deteriorates
Solution Approach 1:
The system dynamically changes the parking brake engagement state based on the detected gear stage. When neutral gear is detected during ignition-off, the system maintains the parking brake in a disengaged state, allowing neutral parking. When parking gear is detected, the system engages the parking brake for security. This dynamic adaptation resolves the contradiction between parking security and neutral parking capability.
Solution Approach 2:
The controller receives feedback signals from the transmission system about the current gear stage (neutral or parking). Based on this feedback, the controller automatically adjusts the parking brake engagement state. This feedback mechanism enables the system to respond appropriately to different parking scenarios, maintaining security when needed while enabling neutral parking when required.
2Stability of the object's composition
If the electronic parking brake is automatically engaged during ignition-off, then vehicle stability is improved, but ease of operation deteriorates
Solution Approach 1:
The system automatically detects the gear stage and self-adjusts the parking brake engagement without requiring manual driver intervention. The controller monitors the transmission state and autonomously decides whether to engage or disengage the parking brake, making the system self-service oriented and improving ease of operation while maintaining stability.
Solution Approach 2:
The system performs preliminary detection of the gear stage during the ignition-off process before finalizing the parking brake engagement. This preliminary action allows the system to prepare the appropriate engagement state in advance, ensuring both vehicle stability and operational convenience by avoiding the need for post-ignition manual adjustments.
3Adaptability or versatility
If the gear stage is shifted to neutral during ignition-off, then neutral parking is enabled, but device complexity increases
Solution Approach 1:
The existing controller and gear stage detection system are utilized for dual purposes: normal gear control and parking brake management. The same controller that manages transmission operations also monitors gear stage during ignition-off to determine parking brake engagement. This multi-functionality approach enables neutral parking capability without adding significant device complexity, as existing components serve multiple functions.
Data Source
AI summary
Provided is an electronic parking brake system including: an electronic parking brake provided in at least one of a front wheel and a rear wheel of a vehicle and driven by a motor; and a controller electrically connected to the motor, wherein the controller is configured to determine whether a gear stage of an electronic transmission system (a shift by wire: SBW) is shifted to a neutral position during ignition-off of the vehicle, and upon determining that the gear stage is shifted to the neutral position, release engagement of the electronic parking brake.