Transmission Pressure Signal Modification via Resistor
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Solution Overview
Problem
Closed-loop transmission systems automatically correct fluid pressure, making it difficult for automotive enthusiasts to achieve the perfect shifting feel without damaging transmission components, as existing methods for adjusting fluid pressure are limited in flexibility and precision.
Innovation Solution
An apparatus and method that includes a pressure sensor, a controller, and a valve, with a resistor in electrical communication between the sensor and controller, modifying the pressure signal to increase fluid pressure in the transmission system, allowing for a 'firmer' shifting feel by altering the signal transmitted to the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring or valve is replaced in the fluid control assembly to increase fluid pressure, then the shifting feel becomes firmer, but the integrated controller automatically corrects the pressure back to the predetermined value, preventing the desired shift feel
Solution Approach 1:
A resistor is introduced as an intermediary component between the pressure sensor and the controller. This resistor modifies the electrical signal from the pressure sensor, causing the controller to perceive a lower pressure than actually exists. The controller then increases the fluid pressure in response to this false low-pressure signal, achieving the desired firm shifting feel without the controller detecting the actual pressure increase
Solution Approach 2:
The electrical resistance parameter is changed by introducing a resistor with a specific resistance value (e.g., 100-1000 ohms) into the signal circuit. This parameter change alters the voltage or current signal from the pressure sensor, thereby changing the controller's perception of the fluid pressure and enabling indirect pressure increase
2Reliability
If excessive line pressure is provided to ensure sufficient engagement of frictional elements, then power loss and damage are prevented, but the fluid pump torque becomes higher than necessary, resulting in poor fuel efficiency
Solution Approach 1:
The system dynamically adjusts fluid pressure based on real-time operating conditions through the controller's continuous monitoring and adjustment of the control valve. The resistor-modified feedback signal enables the controller to optimize pressure levels for current operating conditions, preventing both insufficient engagement and excessive pressure that would waste pump energy
3Reliability
If the fluid pressure is increased to achieve a firm shifting feel, then gear slip is prevented, but the system requires modification of components that may damage transmission parts
Solution Approach 1:
The mechanical approach of directly modifying pressure control components (springs, valves) is replaced with an electrical/electronic solution. A resistor is inserted into the electrical circuit between the pressure sensor and controller, substituting mechanical pressure modification with electrical signal modification. This achieves the same effect of increased fluid pressure without the risk of mechanical component failure or damage to transmission parts
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 solution effectively increases transmission fluid pressure, providing a 'firmer' shifting feel and correcting issues like gear slip while maintaining the system's integrity, without increasing electric current or altering pressure when the vehicle is not in operation.
Implementation Method 1
a resistor disposed within the housing and having a resistance value of between 100 and 1000 Ohms, the resistor being in electrical communication between the pressure sensor and controller
Data Source
AI summary
A transmission system that includes a transmission, a pressure sensor, a pressure booster, and a controller. The pressure booster being capable of raising the pressure of transmission fluid inside a closed-loop transmission by lowering the sensed pressure coming from the pressures sensor and being sent to the controller, thereby initiating a response from the controller that results in higher fluid pressures. The pressure booster does not lower the sensed pressure when the vehicle, and therefore, the transmission, is not in operation. Additionally, the pressure booster also does not increase the electric current through the electrical components of the fluid control system. The result is a transmission with a “firmer” feel between shifts and the correction of weak shifting problems such as gear slip.