Location / task / design / function of PWM solenoid valve, torque converter lockup clutch - GF27.19-P-5112G
TRANSMISSION 722.6
Identifying Converter Lockup Clutch Components Location. Scheme 290
| 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). |
Torque converter lockup clutch PWM solenoid valve, design - GF27.19-P-5112-03G
Transmission 722.6
Identifying Torque Converter Lockup Clutch PWM Solenoid Valve - Design. Scheme 291
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.
Function of torque converter lockup clutch control - GF27.20-P-3002G
TRANSMISSION 722.6
Operating characteristics of the torque converter lockup clutch
Operating Characteristics Graph Of Torque Converter Lockup Clutch. Scheme 292
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 lockup clutch control, function - GF27.20-P-3002N
TRANSMISSION 722.9 in MODEL 171.4, 203, 209, 211, 215, 219, 220, 230
TRANSMISSION 722.9 in MODEL 463.303 /340 /341
The clutch pressure in the torque converter lockup clutch is derived from the working pressure through the torque converter lockup clutch regulating valve. The regulating valve position is influenced by the torque converter lockup clutch control solenoid valve (VGS) (Y3/8y8). The clutch pressure in the torque converter lockup clutch depends on the regulating valve position and thus on the geometry of the torque converter lockup clutch regulating valve. The torque converter lockup clutch has the following control states
- Open
- open-slipping
- SLIPPING
- slipping-open
"Open" control state"
The regulating valve of the torque converter lockup clutch is located in the basic position. The working pressure acts on the converter regulating valve via a connecting line between the torque converter lockup clutch regulating valve and the converter regulating valve. Lubrication pressure is applied to the converter as a result. The torque converter lockup clutch is in the unpressurized condition.
Control state "open-slipping"
The torque converter lockup clutch regulating valve is no longer in the basic position and as a result interrupts the connection between the torque converter lockup clutch regulating valve and the converter regulating valve. The torque converter lockup clutch is filled.
Control state "slipping"
The required slip (specified slip) is stored in the fully integrated transmission control (VGS) control unit (Y3/8n4). The fully integrated transmission control (VGS) control unit (Y3/8n4) calculates the required control current and actuates the torque converter lockup clutch control solenoid valve (VGS) (Y3/8y8) which influences the position of the torque converter lockup clutch regulating valve (pre-control). The clutch pressure in the torque converter lockup clutch depends on the regulating valve position and thus on the regulating valve geometry. The actual slip is determined by the comparison of engine speed with the turbine speed. If necessary, a post-regulation is introduced by the fully integrated transmission control (VGS) control unit (Y3/8n4). The clutch pressure in the torque converter lockup clutch can be increased or reduced by post-regulation.
Control state "slipping-open"
In this control state the clutch pressure in the torque converter lockup clutch is reduced in stages. In this process a constantly progressive operation is involved which is moved along a time ramp from the initial value to zero until the clutch pressure in the torque converter lockup clutch is reduced.
The torque converter lockup clutch is not actuated in limp-home mode
| Torque converter lockup clutch control pressure, function | GF27.60-P-3019N |
Torque converter, location / task / design / function - GF27.20-P-5100G
TRANSMISSION 722.6
Identifying Torque Converter Location / Design / Function. Scheme 293
| 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, 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.
Identifying Torque Converter Function. Scheme 294
Torque converter, location/task/design/function - GF27.20-P-5100N
TRANSMISSION 722.9 in MODEL 171.4, 203, 209, 211, 215, 219, 220, 230
TRANSMISSION 722.9 in MODEL 463.303 /340 /341
Torque Converter Function Diagram - Transmission 722.9. Scheme 295
| Torque converter, location | The torque converter is rigidly bolted to the driven plate in the torque converter housing. | ||
|---|---|---|---|
| Torque converter, task | When the vehicle is stationary and at idle speed it reduces the power flow between the engine and automatic transmission to a minimum; when starting off it serves engine torque multiplication and continuous rpm/torque adjustment. | ||
| Torque converter, design | The impeller (4) is connected to the engine and the turbine wheel (2) to the transmission input shaft. The stator (3) is connected to the transmission housing via a freewheel and stator shaft (8). | ||
| Torque converter, function | GF27.20-P-5100-02N |
Torque converter, function - GF27.20-P-5100-02N
Transmission 722.9 in model 171.4, 203, 209, 211, 215, 219, 220, 230, 463.303/340/341
Identifying Torque Converter Components - Transmission 722.9. Scheme 296
Torque converter, function
When the vehicle is stationary and at idle speed, it is the task of the torque converter to reduce the power flow between the engine and automatic transmission to a minimum. Furthermore, it serves to amplify engine torque and to continuously match rotational speed and torque when starting off.
The impeller (4) is connected to the engine and turbine wheel (2) is connected to the transmission input shaft. The stator (3) is connected to the transmission housing via a freewheel and the stator shaft.
The oil in the torque converter is continuously exchanged so that heat generated during the operating phase can be drawn away by the transmission oil cooler
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
Identifying Torque Converter Lockup Clutch Location/Design/Function. Scheme 297
| 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, function - GF27.20-P-5101-02T
TRANSMISSION 722.6 in MODEL 209, 211, 219, 240
Torque Converter Lockup Clutch Function Diagram. Scheme 298
Function
When actuated by the ETC control unit (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 connected in all forward gears depending on engine speed and engine load.
Location / task / design / function of torque converter lockup clutch - GF27.20-P-5101N
TRANSMISSION 722.9 in MODEL 171.4, 203, 209, 211, 215, 219, 220, 230
TRANSMISSION 722.9 in MODEL 463.303 /340 /341
Torque Converter Lockup Clutch Function Diagram - Transmission 722.9. Scheme 299
| Torque converter lockup clutch, location | The torque converter lockup clutch is integrated in the torque converter. | ||
|---|---|---|---|
| Torque converter lockup clutch, task | To minimize the power losses of the torque converter by reducing converter slip, to reduce engine speed as a result and to improve the efficiency of the transmission. | ||
| Torque converter lockup clutch, design | The external plate carrier (16a) is connected to the impeller (4) via the torque converter housing (17). The internal plate carrier (16b) is connected to the turbine wheel (2). | ||
| Torque converter lockup clutch, function | GF27.20-P-5101-02N |
Torque converter lockup clutch, function - GF27.20-P-5101-02N
Transmission 722.9 in model 171.4, 203, 209, 211, 215, 219, 220, 230, 463.303/340/341
Manual Program Selection Function Flow Diagram - Transmission 722.6 In Model 203 Up To 31.5.03. Scheme 300
Function
With an actuation triggered by the fully integrated transmission control (VGS) control unit (Y3/8n4) oil pressure controlled by the torque converter lockup clutch control solenoid valve (VGS) (Y3/8y8) is lead through the drive shaft (1) to the pressure chamber behind the piston (16d). The piston (16d) compresses the clutch pack (16c) and therefore enables direct torque transmission between the impeller (4) and turbine wheel (2).
The torque converter lockup clutch is engaged in all gears depending on engine speed and load.
The torsional damper damps the vibrations coming from the engine. This improves comfort for the driver and saves wear and tear on the mechanical components of the transmission.
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 control pressure, function - GF27.60-P-3019N
TRANSMISSION 722.9 in MODEL 171.4, 203, 209, 211, 215, 219, 220, 230
TRANSMISSION 722.9 in MODEL 463.303 /340 /341
The torque converter lockup clutch is operated at specified slip speeds. In order to make this possible, the variable control pressure has to be applied to the torque converter lockup clutch regulating valve.
The torque converter lock-up clutch control pressure is adapted to the respective operating condition via the torque converter lockup clutch control solenoid valve (VGS) (Y8/8y8) which is actuated by the fully integrated transmission control (VGS) control unit (Y3/8n4).
| Control solenoid valve, location/task/design/ function | GF27.19-P-5111N | ||
|---|---|---|---|
| Torque converter lockup clutch, location/task/ design/function | GF27.20-P-5101N | ||
| VGS control unit, location/task | GF27.19-P-4013N |
Torque converter lockup clutch regulating valve, location/task/ function - GF27.60-P-5123G
TRANSMISSION 722.6
Locating Torque Converter Lockup Clutch Regulating Valve Components. Scheme 301
| 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 |
Torque converter lockup clutch regulating valve, function - GF27.60-P-5123-01G
Transmission 722.6
Identifying Torque Converter Lockup Clutch Regulating Valve Function. Scheme 302
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).