Compact Electromagnetic Hydraulic Pressure Control Device
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Solution Overview
Problem
Open-loop algorithms used in hydraulic pressure control for automatic transmissions are not adaptable to changes over time due to aging and wear of transmission components and oil properties, leading to inefficiencies and reduced accuracy.
Innovation Solution
A compact electromagnetic control device with a pressure sensor, electronic sensor circuit, electronic control unit, power switch, and solenoid valve, connected directly for fast signal transmission, allowing for closed-loop feedback and precise pressure control using pulse width modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open-loop algorithms are used for hydraulic pressure control, then cost and complexity are reduced, but adaptability to system aging and wear is lost
Solution Approach 1:
The patent implements a closed-loop control system with a pressure sensor that continuously monitors actual hydraulic pressure and feeds this information back to the control unit. The control unit compares the actual pressure with the desired pressure and adjusts the solenoid valve actuation accordingly, enabling the system to adapt to aging and wear while maintaining precise pressure control.
2Ease of manufacture
If separate pressure sensor and control valve are used, then ease of manufacture is improved, but space requirement and mounting complexity increase
Solution Approach 1:
The patent integrates the pressure sensor, electronic sensor circuit, electronic control unit, power switch, and solenoid valve into a single compact electromagnetic unit. This integration reduces the space requirement and simplifies mounting while maintaining the functionality of separate components, making the overall system more space-efficient and easier to install.
Solution Approach 2:
The patent employs a nested structure where the pressure sensor, electronic circuits, and control components are housed within the solenoid valve body. The electromagnetic unit is integrated into the existing transmission housing, utilizing available space efficiently and reducing the overall footprint of the pressure control system.
3Device complexity
If bus system is used for signal transmission, then device complexity is reduced, but signal transmission speed decreases
Solution Approach 1:
The patent extracts the pressure sensor and control unit from the main transmission control system and integrates them directly into the pressure control electromagnetic unit. This direct integration eliminates the need for bus system communication for critical pressure control signals, enabling faster response times while reducing the complexity of the overall signal transmission 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 solution enables high-frequency operation of the solenoid valve, reducing energy consumption and achieving precise pressure control with reduced overshooting and faster response times, thus maintaining accuracy and efficiency throughout the system's service life.
Implementation Method 1
a pressure sensor (7) for detecting actual pressure values of the hydraulic pressure
Implementation Method 2
a solenoid valve (9) which is actuated by the power switch and has the purpose of generating the hydraulic pressure
Data Source
AI summary
A control device for controlling a hydraulic pressure of a fluid transmission includes a pressure sensor for detecting actual pressure values of the hydraulic pressure, an electronic control unit for generating a control signal as a function of the actual pressure values detected by the pressure sensor and a reference pressure signal delivered to the control unit, a power switch controlled by the control signal and a solenoid valve actuated by the power switch for generating the hydraulic pressure. The control device is configured as a compact electromagnetic unit. The electronic control unit is respectively connected to the pressure sensor and to the power switch by a direct electrical connection. A method for controlling a hydraulic pressure of a fluid transmission is also provided.