Offset Torque Control for Slope Parking Vibration Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle parking systems generate significant vibration and impact noise, along with increased operating force, when shifting from the parking position to reverse or drive on a slope due to torque generated by the vehicle's weight and slope gradient, leading to reduced quality and increased wear on components.
Innovation Solution
An apparatus and method that detect the driver's intention to release the parking state and apply an offset torque to the parking gear in a direction opposite to the torque generated by the vehicle's weight and slope, using a combination of engine torque amplification and battery-powered drive motor to reduce frictional resistance and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional parking system with ratchet structure is used, then the parking gear can be locked to hold the vehicle on slope, but large vibration and impact noise are generated when releasing from parking position
Solution Approach 1:
The system applies preliminary torque to the parking gear in the opposite direction of the torque generated by vehicle weight and slope gradient before releasing the parking position. This preliminary anti-action counterbalances the forces that would otherwise cause sudden sprag disengagement and powertrain movement, thereby preventing vibration and impact noise when transitioning from parking to drive or reverse position
Solution Approach 2:
The control unit detects driver intention to release parking and activates the torque application mechanism before the actual release occurs. By applying offset torque in advance, the system prepares the parking gear to smoothly transition from locked to unlocked state, avoiding sudden mechanical movements that generate harmful vibrations and noise
2Reliability
If the parking system uses sprag and parking cam structure, then the parking gear can be locked, but the releasing force required to move the shift lever is increased
Solution Approach 1:
The system applies a counter-torque to the parking gear that opposes the torque generated by vehicle weight and slope gradient. This counter-torque reduces the net force that the sprag must overcome to disengage from the parking cam, thereby reducing the releasing force required on the shift lever while maintaining the original locking function
Solution Approach 2:
The control system dynamically changes the torque parameter applied to the parking gear based on detected driving conditions (slope gradient, vehicle weight). By adjusting the offset torque magnitude, the system optimizes the balance between maintaining reliable locking and reducing releasing force, adapting to different operating scenarios
3Ease of operation
If the shift lever is released from parking position on slope, then the vehicle can be started, but the powertrain returns to original position generating large vibration and impact
Solution Approach 1:
Before releasing the parking position, the system applies preliminary offset torque to the parking gear that counteracts the torque from vehicle weight and slope. This prevents the sudden powertrain movement and sprag disengagement that would otherwise occur, thereby eliminating vibration and impact noise during vehicle startup from parked position on slope
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
The offset torque reduces the operating force required to release the shift lever, decreases vibration and impact noise, and enhances the durability of components by minimizing frictional contact between the parking cam and sprag, thereby improving the overall vehicle parking experience.
Implementation Method 1
a torque converter for receiving an output torque of an engine and amplifying the received torque
Implementation Method 2
a drive motor for receiving power from a battery and generating torque
Implementation Method 3
minimizing frictional contact between the parking cam and sprag
Data Source
AI summary
A method for applying a torque for vibration reduction and controlling the torque in a vehicle parking system may include detecting a driver's intention to release a parking state of a vehicle being parked on a slope and applying an offset torque to the parking gear to offset the torque generated by the weight of the vehicle and the gradient of the slope. An apparatus for applying the method may include a torque converter and a gear unit for amplifying and applying the output torque from an engine in an idle state to the parking gear, and/or a drive motor which is directly connected to the parking gear, generates a torque using a power of a battery, and applies the torque to the parking gear.