Transmission Description - System Operation and Component Description: Notes
System Diagram
Gas Engines
| Item | Description |
|---|---|
| 1 | B clutch |
| 2 | C clutch |
| 3 | D clutch |
| 4 | E clutch |
| 5 | F clutch |
| 6 | Output speed sensor |
| 7 | Turbine speed sensor |
| 8 | Transmission |
| 9 | Transmission |
| 10 | Torque converter clutch |
| 11 | Transmission range sensor |
| 12 | Transmission fluid temperature |
| 13 | Powertrain control module |
| 14 | Line pressure control |
| 15 | Intermediate speed sensor B |
| 16 | Intermediate speed sensor A |
| 17 | A clutch |
Diesel Engines
| Item | Description |
|---|---|
| 1 | B clutch |
| 2 | C clutch |
| 3 | D clutch |
| 4 | E clutch |
| 5 | F clutch |
| 6 | Output speed sensor |
| 7 | Turbine speed sensor |
| 8 | Transmission |
| 9 | Transmission |
| 10 | Transmission control module |
| 11 | Transmission range sensor |
| 12 | Transmission fluid temperature |
| 13 | Powertrain control module |
| 14 | Line pressure control |
| 15 | Intermediate speed sensor B |
| 16 | Intermediate speed sensor A |
| 17 | A clutch |
| 18 | Torque converter clutch |
Network Message Chart
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Engine Speed | TCM | Directly affects shift scheduling, TCC control, line pressure and transmission diagnostics. Indirectly affects shift pressure control. |
| Engine torque estimate | TCM | Directly affects shift pressure control, TCC control and transmission diagnostics. Indirectly affects shift scheduling and TCC scheduling. |
| APP | PCM | Directly affects shift scheduling, TCC scheduling and transmission diagnostics. Indirectly affects TCC control and shift control. |
| Commanded engine torque | PCM | Directly affects shift scheduling, TCC scheduling and transmission diagnostics. Indirectly affects shift control. |
System Operation
The 10R80 transmission is a 10-speed, step ratio rear wheel drive transmission that is controlled by a PCM for gas engine applications or a TCM for diesel engine applications. The 10R80 has ten forward speeds, one reverse speed, four planetary gear sets, one mechanical One-Way Clutch or OWC, six friction clutches, an upper valve body, a lower valve body with eight solenoids, and PCM or TCM controlled electronics. The 10R80 utilizes six shift (A-F) solenoids that are linear force solenoids. Unlike previous shift solenoids they are mechanical in nature in that no transmission fluid passes through them. CIDAS s use a armature/pin assembly that moves a control valve in the main control valve body to control and apply hydraulic fluid pressure. Each clutch (A-F) is controlled by a corresponding shift solenoid (A-F). These solenoids are directly proportional in that zero current equals zero pressure and maximum current equals maximum pressure. If the power circuit to the transmission solenoids fails open, then all solenoids are failed electrically OFF, none of the clutch packs are able to engage and there is no fail safe operation.