Vehicle Parking Locking Mechanism for N-to-P Shift Control
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Solution Overview
Problem
Existing parking apparatuses for vehicles require separate sequence control and hydraulic pressure to shift the gear shift position to the P position after maintaining the N position, which complicates the implementation of safety functions and control.
Innovation Solution
A parking apparatus that uses a solenoid to fix a detent lever with a sprag, allowing the gear shift position to be shifted to the P position after an N position is maintained, utilizing a piston, detent lever, sprag, and driver to restrict rotation and apply electromagnetic forces for locking and unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sequence control and hydraulic pressure are applied to shift gear to P position, then the gear shift position can be maintained and shifted, but the control complexity increases and safety function implementation becomes difficult
Solution Approach 1:
The patent replaces the traditional hydraulic pressure-based detent lever control system with an electromagnetic actuator system. The electromagnetic actuator directly drives the detent lever to rotate between P and N positions, eliminating the need for complex hydraulic pressure application sequences and improving both control simplicity and reliability.
Solution Approach 2:
The patent extracts and removes the hydraulic pressure control mechanism from the gear shift positioning system. By eliminating the hydraulic pressure application step and the associated sequence control requirements, the system achieves simpler control logic while maintaining reliable gear position switching through direct electromagnetic actuation of the detent lever.
2Stability of the object's composition
If hydraulic pressure is continuously applied to maintain N position, then the gear shift position can be maintained, but energy consumption increases and system complexity increases
Solution Approach 1:
The patent employs periodic or intermittent electromagnetic actuation instead of continuous hydraulic pressure application. The electromagnetic actuator is activated only when gear position switching is required (from P to N or from N to P), and remains inactive during position maintenance, thereby significantly reducing energy consumption while maintaining position stability through the mechanical detent mechanism.
Solution Approach 2:
The detent lever mechanism with its locking grooves and engagement features provides self-locking capability. Once the electromagnetic actuator positions the detent lever in the desired gear position (P or N), the mechanical structure itself maintains the position without requiring continuous energy input, achieving stable gear position maintenance with minimal energy consumption.
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
Simplifies the control process by eliminating the need for separate hydraulic pressure application, enhancing safety and reliability by ensuring the gear shift position is accurately maintained and shifted using electromagnetic forces.
Implementation Method 1
a sprag fixes a detent lever using a solenoid, such that a gear shift position can be shifted to a P position after an N position is maintained
Implementation Method 2
a piston moved according to whether hydraulic pressure is introduced
Implementation Method 3
a sprag disposed on a rotation path of the detent lever, and locked to the detent lever so as to restrict the rotation of the detent lever
Data Source
AI summary
A parking apparatus for a vehicle may include: a piston moved according to whether hydraulic pressure is introduced; a detent lever rotated by the movement of the piston; a sprag disposed on a rotation path of the detent lever, and locked to the detent lever so as to restrict the rotation of the detent lever; and a driver contacted with the sprag, and configured to transfer rotational power to the sprag.