Transmission Pump Speed Control for High G-Force Maneuvers
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Solution Overview
Problem
During high acceleration maneuvers, vehicle transmissions experience reduced fluid flow and noisy pump operation due to fluid being moved away from the pump inlet, leading to inaccurate fluid circulation estimates and noise issues.
Innovation Solution
A method that senses vehicle acceleration using accelerometers and adjusts the pump's operating state through a transmission control module, reducing pump speed or adjusting fluid flow circuits to maintain fluid supply and reduce noise, especially during high acceleration maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump operates at high speed during vehicle acceleration, then fluid circulation capacity is improved, but fluid may be moved away from the pump inlet causing noisy operation and reduced fluid flow
Solution Approach 1:
The pump speed is dynamically adjusted based on real-time vehicle acceleration data from accelerometers. The transmission control module continuously monitors acceleration and modifies pump operating speed accordingly, transitioning from static to dynamic control to prevent fluid starvation while maintaining circulation capacity
Solution Approach 2:
The system changes the operating parameters of the pump by adjusting its rotational speed in response to detected acceleration events. When acceleration exceeds a threshold, the pump speed is reduced to a lower operating state that prevents noise and fluid flow issues while still maintaining adequate circulation
2Object-affected harmful factors
If the pump speed is reduced during high acceleration, then noise is reduced and fluid supply is maintained, but fluid circulation capacity decreases
Solution Approach 1:
The pump operates in multiple dynamic speed states rather than a single fixed speed. The system switches between high-speed and low-speed operating states based on real-time acceleration conditions, optimizing the balance between noise reduction and circulation capacity
Solution Approach 2:
The pump speed is periodically adjusted in response to changing acceleration conditions. The transmission control module continuously monitors acceleration and switches between operating states as needed, creating a periodic adjustment pattern that maintains optimal performance throughout varying driving conditions
3Device complexity
If the pump operates without adjusting for acceleration, then device complexity is minimized, but measurement precision of fluid circulation is degraded
Solution Approach 1:
The system implements a feedback mechanism where accelerometers provide real-time acceleration data to the transmission control module, which then adjusts pump operation accordingly. This closed-loop feedback enables accurate fluid circulation measurement by compensating for acceleration-induced variations
Solution Approach 2:
The patent replaces complex mechanical fluid flow measurement systems with an accelerometer-based electronic sensing and control system. This substitution uses electronic sensors and control logic to achieve precise fluid circulation measurement while maintaining relatively simple device architecture
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 method effectively reduces noise and improves the accuracy of fluid circulation estimates by ensuring consistent fluid supply to the gearbox, even during high acceleration, thereby enhancing transmission performance and diagnostic accuracy.
Implementation Method 1
sensing an acceleration of the vehicle with at least one accelerometer of the vehicle
Data Source
AI summary
A method of controlling a transmission having a gearbox and a pump operable to circulate a fluid through the gearbox, includes sensing an acceleration of the vehicle, and adjusting an operating state of the pump. The operating state of the pump is adjusted to change the operating state of the pump from an initial operating state, to an adjusted operating state, when the acceleration of the vehicle is greater than an acceleration threshold. When the acceleration of the vehicle decreases from being greater than the acceleration threshold to being below the acceleration threshold, the operating state of the pump is returned to the initial operating state. The operating state of the pump may include a speed of the pump, a control signal representing a fluid flow rate for the current speed of the pump, or a fluid flow circuit for supplying the fluid to the pump.