Automatic Transmission Parking Drag Control
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Solution Overview
Problem
Automatic transmission vehicles experience distortion and energy accumulation in the drive shaft when parked on sloped roads, leading to durability issues and noise upon releasing the parking mode due to the vehicle's weight causing torque on the wheel, drive shaft, and parking gear, resulting in vibration and noise during energy release.
Innovation Solution
A control apparatus and method that includes a speed detector, shift lever detector, slope degree detector, and controller to supply predetermined hydraulic pressure to clutch and brake elements, generating drag on the parking gear shaft when the shift lever is in parking mode, especially on sloped roads, to minimize distortion and noise by analyzing vehicle speed and slope degree, using a drag map table to determine optimal hydraulic pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle is parked on a sloped road without additional drag control, then the parking apparatus can maintain the parked state, but the drive shaft and parking gear experience distortion and energy accumulation leading to durability deterioration
Solution Approach 1:
The controller applies drag force to the parking gear shaft in advance before the vehicle thrust causes significant distortion. By detecting parking mode conversion and slope conditions, the system proactively creates a counteracting drag force that prevents the harmful distortion and energy accumulation from occurring in the first place
Solution Approach 2:
The parking gear shaft acts as an intermediary element between the vehicle thrust and the clutch/brake elements. By applying controlled drag to the parking gear shaft, the system creates a mediating force that absorbs and dissipates the energy from vehicle thrust, protecting the drive shaft and parking gear from direct distortion
2Reliability
If hydraulic pressure is supplied to generate drag on the parking gear shaft, then distortion and energy accumulation are minimized, but the device complexity and control system requirements increase
Solution Approach 1:
The clutch and brake elements, which are existing components in the automatic transmission system, are repurposed to generate drag on the parking gear shaft. This multi-functional use of existing components avoids adding separate dedicated drag-generation mechanisms, thereby limiting the increase in device complexity
Solution Approach 2:
The controller utilizes existing sensors (speed detector, shift lever detector, slope degree detector) already present in the vehicle to detect parking conditions and automatically control the hydraulic pressure. The system serves itself by using its own existing detection and control capabilities without requiring external complex monitoring systems
3Object-generated harmful factors
If drag is generated on the parking gear shaft during parking mode, then vibration and noise upon releasing parking mode are reduced, but the ease of operation and response time may be affected
Solution Approach 1:
The drag force is applied periodically or conditionally rather than continuously. The controller supplies hydraulic pressure to generate drag only when specific conditions are met (parking mode conversion detected and slope exceeds threshold), and releases the drag when parking mode is released. This periodic/conditional application minimizes the impact on ease of operation while still achieving vibration and noise reduction
4Reliability
If the controller supplies hydraulic pressure based on slope degree and vehicle speed, then optimal drag is achieved to minimize distortion, but the measurement precision and detection requirements increase
Solution Approach 1:
The controller uses existing detection capabilities to obtain slope degree and vehicle speed information, applying hydraulic pressure based on these measurements. Rather than requiring extremely high precision measurements, the system uses the available detection data to determine when and how much drag to apply, achieving sufficient protection against distortion without demanding excessive measurement precision
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 minimizes drive shaft distortion and energy accumulation, reducing vibration and noise when releasing the parking mode, enhancing vehicle durability and product quality by applying controlled drag on the parking gear shaft based on slope and vehicle conditions.
Implementation Method 1
an actuator that supplies the hydraulic pressure to the clutch elements and the brake elements or discharges the hydraulic pressure from the clutch elements and the brake elements according to the control of the controller
Implementation Method 2
supplying predetermined hydraulic pressure to brake elements and clutch elements in order to create drag on a parking gear shaft
Implementation Method 3
generating drag on the parking gear shaft by supplying predetermined hydraulic pressure to clutch elements and brake elements
Data Source
AI summary
An apparatus for parking control of an automatic transmission vehicle may include a speed detector that provides a controller with a vehicle speed, a shift lever detector that provides the controller with a position of a shift lever, the controller that analyses the vehicle speed and the position of the shift lever, and supplies a predetermined hydraulic pressure to brake elements and clutch elements in order to create drag on a parking gear shaft in conversion into a parking mode, and an actuator that supplies the hydraulic pressure to the clutch elements and the brake elements or discharges the hydraulic pressure from the clutch elements and the brake elements according to the control of the controller.