USDII System Overview
The USD II is a system designed for use in the development and testing of transmission solenoids. The system allows for a custom configuration (depending on the users needs) of up to seven solenoid driver types per USDII System Rack. The flexibility of the system allows solenoids to be exercised both in and out of the transmission. The USDII is controlled via a serial link to a PC using either WCOM8 software or custom software using tools like Lab View.
UDSII Applications
- End of Line Testing for completed transmissions
- Solenoid Durability Testing
- End of Line Solenoid Testing
- Dynamometer Transmission Testing and Development
- Transmission NVH Development
UDSII System Components
- USDII System Rack Assembly (Holds any combination of up to 7 modules)
- USDII Modules (ROC, VFS, PWML, PWMH, PWMHS, ON/OFF) Minimum of 1 module required to operate system
- Solenoid Harness for either direct connection to the solenoid(s) or to a transmission
- Power Harness to Module Rack
System Component Overview
Driver Modules
In order the for the USD II to function, a driver module needs to be plugged into slot 0. The type of module (i.e., VFS, PWMH, PWMHS, PWML, ROC or an ON/OFF driver module) used in slot 0 doesn’t matter, because the various drive modules are not slot dependent (slot 0 is located as the first slot on the left while facing the front of the USD II.
The driver modules have two circuit boards, the smart card, which handles the communication between the other drive modules and the host computer. The second circuit board, the daughter card (Wart Board), which contains the drive IC that drives the solenoids. The daughter cards are designed to plug on to the smart cards and can be easily removed. The daughter cards also contain the circuit protect fuses, and can be easily replaced if necessary.
As new driver ICs are developed, daughter cards can be designed for the application of the new IC. The board outline and other technical files are obtainable from Global Electronics, Ltd.
Driver Module Face Plate Description
Each driver module is a subsystem component. Below is a description of the face plate features on each module and what they mean.
| Analog Out BNC: This is an output connector for use as an oscilloscope hook-up. This allows the user to view the DC voltage delivered to the solenoid. |
| Solenoid Status LEDs: These LEDs show when the solenoids are activated. There are Four LEDs to indicate the status of the on/off solenoids because a single on/off driver Module drives four solenoids (in slot 0 or 1). In the case of the ROC, VFS, PWML, PWMHS and PWMH modules, which drive just one solenoid, only LED number one will light, when the solenoid indicating a good status. |
| Power LED: The power LED indicates there is power delivered to the module. |
| HI Fuse and LO Fuse OK LEDs: These two LEDs light when the fuses on the daughter Cards are operational. In the case of an open fuse the corresponding LED will be off and the solenoid OK LED will also be off. |
| Wart Pres: This LED indicates a daughter card is installed on to the smart card. |
| Solenoid OK LED: This indicates the solenoid is connected to the circuit. |
When the USD II is powered up each LED will be on, with the exception of the solenoid status LEDs, showing each component is function; however, the solenoid status LEDs will only come on when the solenoid is activated.
System Rack and Power Harness
The USDII System Rack contains the system mother board. The mother board provides the interface to the modules for all communications, power and I/O.
The power harness supplies +12v for the driver modules and +12v for the solenoids through the motherboard. The solenoid harness carries the current to the solenoids and also provides transmission ID wires, which are used for customizing solenoid harnesses that will enable the USD II to detect what type of transmission solenoid configuration is connected to it (see the technical manual for a complete pin-out of the power and solenoid harnesses).
The rear adapter harness is to provide an interface between the USD II and the original USDB solenoid harness. The rear adapter harness converts the fifty six and twenty pin Edac connectors (located on the USD II’s mother board) into thirty seven and fourteen pin Amp connectors; thus, providing compatibility with the USD II’s predecessor.
Terminating Connectors
There are two BNC connectors mounted on the rear of the USD II. These BNC connectors are used for connecting a coaxial cable between two USD II system racks (currently two mother racks can be daisy chained together; thus, allowing a total of fourteen driver modules). It is important to note, any unused rear BNC connector needs a 50W terminating connector installed.
Rack ID Jumpers
Located on the rear of the USD II are three jumper pins (J11, J12 and J13). These jumper pins are used to identify the mother rack connected to the host computer and allow for unique addressing if a second rack is used.
Note: Future updates will allow eight racks to be daisy chained together for a total capacity of fifty six driver modules.
Wcom software for DOS
The Wcom software is a dos based program that allows the user to control the solenoids at a lower level. Using the software requires an understanding of the hexadecimal numbering system and an understanding of the software commands for the USD II. This software is handy when doing system troubleshooting.
Transmission ID
Setting a transmission ID is done by installing jumper wires within the external solenoid harness (the harness that goes between the USD II and the transmission solenoids). The 56 pin Edac connector mounted on the harness that plugs into the USD II is where the jumpers go. The jumpers are made up of twelve gauge wires crimped onto the Edac pins.
If a transmission ID of “manual” is selected, then any solenoid configuration will be accepted by the program. This makes it convenient to test a single solenoid or a combination of solenoids not associated with a transmission solenoid configuration. Subsequently, if a transmission ID for a specific transmission is selected, then the software can be programmed to verify that the solenoids, associated with the specific transmission, are connected properly.
External Harnesses
External harnesses are made up of sixteen gauge wire and a 56 pin Edac connector. One end connects to the solenoid(s) and the other end plugs into the mating 56 pin Edac connector on the USD II. Harnesses are available in any type of custom configuration to meet the users testing requirements.
USDII Part Number and Pricing Information:
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