Transmission Control US - f01. · PDF fileIn contrast to the automatic trans-mission W5A 580,...
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Electrohydraulic control 18 Transmission control Model Year 2004 I Automatic Transmission 722.9 Fully integrated transmission control In contrast to the automatic trans- mission W5A 580, in which the Electronic Transmission Control (ETC) control module is designed as a standalone control module, the fully integrated transmission control (ETC) in the new automatic transmission W7A 700 is mounted directly in the oil pan on the hydraulic control system. This means that the ETC is constantly bathed in transmission oil. This helps to dissipate the heat from the control module. The advantages of this full integra- tion over conventional transmis- sion control modules are marked by the following features: • All electrical transmission functions and components integrated into a single module • Direct integration into the transmission • Minimized interfaces with the wiring harness • Weight reduction • Availability of the transmission as a fully functional, harmonized and tested self- sufficient module The ETC is networked with the engine control module and other systems over the CAN data bus. In this way the signals from sensors, variables and computed data are all available to all the other control modules at the same time. Commands to reduce the engine torque during the gear change sequences and shift point alter- ations to speed up the heating of the catalytic converter in the warm-up phase are communicated bidirectionally between the engine control module and the ETC. Input signals Signals from the ETC hardware: • Position of selection range valve • Automatic transmission fluid (ATF) temperature • Turbine speed (n turb ) • Internal transmission speed (n 2 ) • Output speed (n out ) Output signals Signals from the ETC software: • Actuation of the control solenoid valves for working pressure, K1-K3, B1, B2/BR, B3, torque converter lock-up clutch From the CAN data bus: • Altitude correction for shift curve and pressure control • Accelerator pedal movement • Manual shift request via electronic selector lever module • Vehicle longitudinal and lateral accelerations • Kickdown switch • Engine torque • Engine speed • Engine temperatures To the CAN data bus: • Actual and target gear • ATF temperature • Turbine speed • Output speed i Note A long-term adaptation feature is designed to provide for smoothness of the gearshift throughout the entire service life of the transmission. The ETC detects changes in the engine and transmission properties which are due to aging, and adjusts the control automatically.
Transcript of Transmission Control US - f01. · PDF fileIn contrast to the automatic trans-mission W5A 580,...
Electrohydraulic control
18
Tran
smis
sion
con
trol
Model Year 2004 I Automatic Transmission 722.9b
Fully integrated transmission control
In contrast to the automatic trans-mission W5A 580, in which the Electronic Transmission Control (ETC) control module is designed as a standalone control module, the fully integrated transmission control (ETC) in the new automatic transmission W7A 700 is mounted directly in the oil pan on the hydraulic control system. This means that the ETC is constantly bathed in transmission oil. This helps to dissipate the heat from the control module.
The advantages of this full integra-tion over conventional transmis-sion control modules are marked by the following features:
• All electrical transmission functions and components integrated into a single module
• Direct integration into the transmission
• Minimized interfaces with the wiring harness
• Weight reduction• Availability of the transmission
as a fully functional, harmonized and tested self-sufficient module
The ETC is networked with the engine control module and other systems over the CAN data bus. In this way the signals from sensors, variables and computed data are all available to all the other control modules at the same time.
Commands to reduce the engine torque during the gear change sequences and shift point alter-ations to speed up the heating of the catalytic converter in the warm-up phase are communicated bidirectionally between the engine control module and the ETC.
Input signals
Signals from the ETC hardware:
• Position of selection range valve
• Automatic transmission fluid (ATF) temperature
• Turbine speed (nturb)• Internal transmission speed
(n2)• Output speed (nout)
Output signals
Signals from the ETC software:
• Actuation of the control solenoid valves for working pressure, K1-K3, B1, B2/BR, B3, torque converter lock-up clutch
From the CAN data bus:
• Altitude correction for shift curve and pressure control
• Accelerator pedal movement• Manual shift request via
electronic selector lever module
• Vehicle longitudinal and lateral accelerations
• Kickdown switch• Engine torque• Engine speed• Engine temperatures
To the CAN data bus:
• Actual and target gear• ATF temperature• Turbine speed• Output speed
i Note
A long-term adaptation feature is designed to provide for smoothness of the gearshift throughout the entire service life of the transmission. The ETC detects changes in the engine and transmission properties which are due to aging, and adjusts the control automatically.
Transmission Control US.fm Page 18 Thursday, August 28, 2003 10:53 AM
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19Model Year 2004 I Automatic Transmission 722.9 b
Input signals Output signals
Block diagram
1 Control module 2 Control solenoid valves, K1 - K3, B1 - B3, BR and
torque converter lock-up clutch3 Rpm sensor nout4 Rpm sensors nturb and n25 Selection range sensor
6 Transmission plug:- CAN- Battery voltage- Diagnosis
ATF temperature sensor integrated in ETC
Transmission Control US.fm Page 19 Thursday, August 28, 2003 10:53 AM
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Model Year 2004 I Automatic Transmission 722.9b
Fully integrated transmission control
1 Float 12 Selection range sensor3 Rpm sensors nturb and n24 Control module5 Float 26 Transmission plug:7 Rpm sensor nout
a Control solenoid valve B2/BRb Control solenoid valve K2c Working pressure control solenoid valved Control solenoid valve KÜBe Control solenoid valve K1f Control solenoid valve B1g Control solenoid valve B3h Control solenoid valve K3
Transmission Control US.fm Page 20 Thursday, August 28, 2003 10:53 AM
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21Model Year 2004 I Automatic Transmission 722.9 b
Design of electrohydraulic control
1 CAN High line2 CAN Low line3 Diagnosis K-line4 Circuit 87, battery voltage (+)5 Circuit 31, battery voltage (-) 6 Electrics7 Valve body8 Intermediate panel9 Shift valve housing
a Control solenoid valve B2/BRb Control solenoid valve K2c Working pressure control solenoid valved Control solenoid valve torque converter lock-up
clutche Control solenoid valve K1f Control solenoid valve B1g Control solenoid valve B3h Control solenoid valve K3
Transmission Control US.fm Page 21 Thursday, August 28, 2003 10:53 AM
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