Torque converter lockup clutch PWM solenoid valve, design - GF27.19-P-5112-03G
Transmission 722.6
Scheme 269
Structure
The torque converter lockup PWM solenoid valve (Y3/6y6) is sealed off to the valve body of the shift plate (2a) by an O-ring (34) and a seal (arrow).
The contact springs (32) on the PWM converter lockup solenoid valve (Y3/6y6) engage in a slot in the conductor tracks (33). The force of the contact spring (32) ensures safe contacts.
Location / task / design / function of PWM solenoid valve, torque converter lockup clutch - GF27.19-P-5112G
TRANSMISSION 722.6
Scheme 270
| Torque converter lockup clutch PWM solenoid valve, location | In the supporting body of the electrical control unit (Y3/6) and pressed against the valve housing of the shift plate (2a) by means of a leaf spring (2c). | ||
|---|---|---|---|
| Torque converter lockup clutch PWM solenoid valve, task | The PWM solenoid valve for the torque converter lockup (Y3/6y6) controls the pressure for the torque converter lockup clutch. | ||
| Torque converter lockup clutch PWM solenoid valve, design | GF27.19-P-5112-03G | ||
| Torque converter lockup clutch PWM solenoid valve, function | It converts a pulse-width-modulated current actuated by the ETC control module (N15/3) into the corresponding hydraulic pressure KUB (p-S/KUB). |
Function of torque converter lockup clutch control - GF27.20-P-3002G
TRANSMISSION 722.6
Operating characteristics of the torque converter lockup clutch
Scheme 271
Operation
The aim of using the torque converter lockup clutch is to reduce the fuel consumption and exhaust gas emissions of the vehicle by reducing torque converter slip. This stands in contradiction to the ride comfort demands made on the drive train with regard to its vibration behavior. The task of the electronic transmission control is therefore to close the clutch in all driving situations relevant to fuel consumption, if possible, and ensure that the engine vibrations are isolated from the drive train.
The characteristic curves shown in the diagram illustrate the different operating states of the torque converter lockup clutch in relation to the accelerator pedal position and the transmission output speed, plotted for one transmission gear.
In addition to the evaluation of these characteristics, the status of the torque converter lockup clutch is also determined by other variables.
Variables influencing the states of the torque converter lockup clutch
- Accelerator pedal movement
- Uphill and downhill gradients
- Transmission shift functions
- ATF temperature
- Durability requirements
- Load condition
- Engine control influences
| Torque converter lockup clutch control pressure, function | GF27.60-P-3019G |
Torque converter, function - GF27.20-P-5100-02G
Transmission 722.6
Transmission 722.7
Due to the effect of centrifugal force, the blades of the impeller (P) pump the oil outwards to the turbine wheel (T), causing it to rotate. The turbine wheel blades direct the oil onto the blades of the stator, which in turn push the oil back to the impeller (P) (arrow). This diversion at the stator (L), which is supported against the transmission housing via the freewheel, produces an increase in torque. At the maximum speed difference between the impeller (P) and the turbine wheel (T), the torque conversion achieves its maximum value at a factor of 1.8 to 2.0, dropping to a torque ratio of 1:1 as the speeds converge. From this operating state onwards, also referred to as the coupling point, the stator (L) rotates with the impeller (P) and the turbine wheel (T).
Efficiencies of up to approx. 98 % are achieved in the coupling range.
The oil in the torque converter is constantly being replaced so that the heat produced in the operating phase can be dissipated via the transmission oil cooler.
Scheme 272
Torque converter, location / task / design / function - GF27.20-P-5100G
TRANSMISSION 722.6
Scheme 273
| Torque converter, location | The torque converter is rigidly bolted to the driver plate in the torque converter housing. | ||
|---|---|---|---|
| Torque converter, task | Reduces the power flow between the engine and the automatic transmission to a minimum when the vehicle is stationary and the engine is idling, boosts the engine torque and provides infinitely variable engine speed and torque matching when moving off. | ||
| Torque converter, design | The impeller (P) is connected to the engine, the turbine wheel (T) is connected to the transmission input shaft. The stator (L) is connected to the transmission housing via a freewheel and the stator shaft (8). | ||
| Torque converter, function | GF27.20-P-5100-02G |
Torque converter lockup clutch, function - GF27.20-P-5101-02G
Transmission 722.6 in models 129, 140, 163, 170, 202, 203, 208, 210, 230 Transmission 722.6 in models 215, 220 except code (479) cylinder shutoff
Scheme 274
Operation
When actuated by the ETC control module (N15/3), oil pressure controlled by the torque converter lockup PWM solenoid valve (Y3/6y6) is directed through the input shaft (1) to the pressure chamber behind the piston (16d). The piston presses the clutch pack (16c) together and allows torque to be transferred directly between the impeller (P) and turbine wheel (T).
The torque converter lockup clutch is activated in 5th, 4th and 3rd gears in relation to the engine speed and engine load.
Torque converter lockup clutch, location/task/design/function - GF27.20-P-5101G
TRANSMISSION 722.6 in MODELS 129, 140, 163, 170, 202, 203, 208, 209, 210, 211, 219, 230, 240
TRANSMISSION 722.6 in MODEL 215, 220 except CODE (479) Cylinder shutoff
Scheme 275
| Torque converter lockup clutch, location | The torque converter lockup clutch is integrated in the torque converter. | ||
|---|---|---|---|
| Torque converter lockup clutch, task | The torque converter lockup clutch minimizes the power losses of the torque converter and as a result reduces the engine speed and improves the efficiency of the transmission. | ||
| Torque converter lockup clutch, design | The external plate carrier (16a) is connected to the impeller (P) via the cover shell (17). The internal plate carrier (16b) is connected to the turbine wheel (T). | ||
| Torque converter lockup clutch, function | Model 129, 140, 163, 170, 202, 203, 208, 210, 215, 220, 230 | GF27.20-P-5101-02G | |
| Model 209, 211,219, 240 | GF27.20-P-5101-02T |
Torque converter lockup clutch control pressure, function - GF27.60-P-3019G
TRANSMISSION 722.6
Apart from the extreme states of open or closed, it is possible to operate the torque converter lockup clutch with preset slip speeds. To enable this variable control pressure must be applied to the torque converter lockup clutch regulating valve.
The torque converter lockup clutch control pressure is adapted to each operating state via the pulse-width-modulated torque converter lockup solenoid valve (Y3/6y6) which is actuated by the ETC control unit (N15/3).
| Torque converter lockup clutch PWM solenoid valve, location/task/design/function | GF27.19-P-5112G | ||
|---|---|---|---|
| Torque converter lockup clutch, location/task/ design/function | Model 129, 140, 163, 170, 202, 203, 208, 209, 210,211,230,240 | GF27.20-P-5101G | |
| Models 215, 220 except code (479) cylinder shutoff | |||
| Model 215, 220 with code (479) cylinder shutoff | GF27.20-P-5101GA | ||
| Type 171.4 | GF27.20-P-5101SK | ||
| Model 199 | GF27.20-P-5101SLR | ||
| Torque converter lockup clutch regulating valve, location/task/function | GF27.60-P-5123G | ||
| ETC control unit, location/task | GF27.19-P-4012SLR |
Torque converter lockup clutch regulating valve, function - GF27.60-P-5123-01G
Transmission 722.6
Scheme 276
Operation
The converter lockup clutch regulating valve (27) regulates the working pressure in the converter lockup clutch (p-KUB) depending on the control pressure in the converter lockup clutch (p-S/KUB).
Depending on the working pressure in the converter lockup clutch (p-KUB) the converter lockup clutch (KUB) is
- Engaged
- Disengaged
- in slip mode
In the lower position of the converter lockup clutch regulating valve (27) lubricating oil (p-Sm) flows through the torque converter and oil cooler (65) into the transmission (converter lockup clutch depressurized). In its regulating position (slipping, torque converter lockup clutch pressurized), a reduced volume of lubricating oil (p-Sm) flows through the annular passage (27a) bypassing the torque converter and passing direct through the oil cooler (65) into the transmission. 65 The other part of the lubricating oil (p-Sm) is led via the restrictor (a) into the torque converter for cooling the converter lockup clutch (KUB).
Torque converter lockup clutch regulating valve, location/task/ function - GF27.60-P-5123G
TRANSMISSION 722.6
Scheme 277
| Torque converter lockup clutch regulating valve, location | In the valve housing of the shift plate. | ||
|---|---|---|---|
| Torque converter lockup clutch regulating valve, task | Hydraulic control of the torque converter lockup clutch and distribution of the lubricating oil. | ||
| Torque converter lockup clutch regulating valve, function | GF27.60-P-5123-01G |