Hydraulic Parking Lock Reset Using Pressure Threshold Sequencing
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Solution Overview
Problem
Current parking lock operating systems require expensive sensors to detect position changes after a power failure, increasing control effort and complexity, and fail to ensure a safe state during power outages or insufficient charging.
Innovation Solution
A hydraulic parking lock operating system that switches between base and transport positions by applying pressure twice above a second threshold and lowering below a first threshold, using sloping surfaces and a latching mechanism to reset the system to a safe base position, ensuring the parking lock is active or inactive as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided to detect the position of the parking lock operating system, then the position can be detected, but the system cost increases and control effort increases
Solution Approach 1:
The parking lock operating system uses its own hydraulic pressure state to determine position and reset requirements, without needing external sensors. The control unit infers position from pressure threshold comparisons, making the system self-diagnosing and self-resetting
Solution Approach 2:
The patent replaces mechanical/electrical sensors with a hydraulic pressure-based detection system. The hydraulic pressure itself carries position information, eliminating the need for separate sensing components
2Reliability
If the parking lock operating system maintains Normally-P function with sensor detection, then safety is ensured, but the control effort and system complexity increase
Solution Approach 1:
The control unit continuously monitors hydraulic pressure and automatically triggers reset sequences when threshold values indicate abnormal positions, creating a closed-loop safety system without complex control logic
Solution Approach 2:
The system automatically detects and corrects its own position errors through hydraulic pressure feedback, ensuring safety without requiring complex external control mechanisms
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 solution simplifies the system, reduces costs by eliminating the need for expensive sensors, and guarantees a safe state by automatically resetting the parking lock to its base position after a power failure, ensuring it remains active or inactive as required.
Implementation Method 1
a pressure present in a hydraulic fluid supply line of the parking lock operating system is increased twice in succession above a second pressure threshold
Data Source
AI summary
A method for resetting a parking lock operating system for a motor vehicle includes providing the parking lock operating system and switching the parking lock operating system. The parking lock operating system includes a hydraulic fluid supply line with a hydraulic fluid, a base position in which a parking lock is active, and a transport position in which the parking lock is active. The parking lock operating system is switched from the base position to the base position or from the transport position to the base position by, in the following order: increasing a pressure of the hydraulic fluid above a second pressure threshold, lowering the pressure below a first pressure threshold, less than the second pressure threshold, increasing the pressure above the second pressure threshold, and lowering the pressure of the hydraulic fluid below the first pressure threshold.