Transmission Solenoid Valve Circuit With Shared High-Side Control
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Solution Overview
Problem
Existing systems for controlling multiple electrical loads in transmission systems require multiple high side current control devices, leading to increased costs and complexity, and are inefficient due to unintended voltage applications affecting the operation of electro-mechanical actuators.
Innovation Solution
A system comprising a single high side current control device and multiple low side switching devices in parallel, controlled by a controller to manage electrical currents to multiple loads, allowing for individual control without the need for multiple high side devices, thereby reducing costs and improving control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple high side current control devices are used to control multiple electrical loads, then individual control precision is improved, but system cost and device complexity increase
Solution Approach 1:
The control system is segmented into high side current control devices and low side switching devices. Each electrical load is controlled by one high side current control device shared among multiple loads, while individual low side switching devices provide load-specific control. This segmentation allows cost reduction through sharing high side devices while maintaining individual control capability through low side devices.
Solution Approach 2:
Multiple electrical loads are electrically coupled in parallel to share a common high side current control device. The high side current control device controls current flow to multiple loads simultaneously, while individual low side switching devices provide separate control paths. This merging reduces the total number of high side devices needed, lowering system cost while maintaining individual load control.
2Adaptability or versatility
If multiple high side current control devices are used to control multiple electrical loads, then individual control capability is improved, but system cost increases
Solution Approach 1:
The control system is segmented into high side current control devices and low side switching devices. Each electrical load is controlled by one high side current control device shared among multiple loads, while individual low side switching devices provide load-specific control. This segmentation allows cost reduction through sharing high side devices while maintaining individual control capability through low side devices.
Solution Approach 2:
A single high side current control device is designed to control multiple electrical loads simultaneously, providing multi-functionality. The device can selectively control current to different loads based on control signals from the controller and the state of low side switching devices, reducing the need for dedicated high side devices for each load.
3Reliability
If multiple high side current control devices are used, then control reliability under nominal conditions is improved, but electrical losses and system cost increase
Solution Approach 1:
Multiple electrical loads are electrically coupled in parallel to share a common high side current control device. The high side current control device controls current flow to multiple loads simultaneously, while individual low side switching devices provide separate control paths. This merging reduces the total number of high side devices needed, lowering system cost while maintaining individual load control.
Solution Approach 2:
Low side switching devices act as intermediaries between the shared high side current control device and individual electrical loads. They enable selective control of current to specific loads while sharing the high side control device, reducing electrical losses by avoiding redundant high side devices and their associated power consumption.
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 system effectively controls multiple electrical loads with fewer high side current control devices, reducing system costs and electrical losses while providing precise control over the loads, and enabling smoother shifting in transmission systems.
Implementation Method 1
The electro-mechanical actuator may receive an electrical current and a valve of the electro-mechanical actuator may open or close responsive to the level of electrical current that is provided to the electro-mechanical actuator
Implementation Method 2
a controller including executable instructions stored in non-transitory memory to switch a first of the two or more low side switching devices at a first frequency and a first duty cycle, and instructions to switch a second of the two or more low side switching devices at the first frequency and a second duty cycle
Data Source
AI summary
Methods and systems for operating a plurality of electrical loads are described. In one example, the systems include electrical circuits for operating solenoid valves of a transmission that may be operated to simultaneously control two or more clutches for engaging and disengaging transmission gears. The systems and method may reduce hardware costs.