torque converter slip desired

CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Once this initial value is set, a target value to which to reduce slip must be selected. Method to control torque converter slip in a powertrain after a rapid increase in an engine torque command, the powertrain including an engine, a transmission, and a torque converter located between the engine and the transmission, the method comprising: monitoring a measured torque converter slip after the rapid increase in the engine torque command; determining a maximum measured torque converter slip resulting from the rapid increase in the engine torque command based upon the measured torque converter slip; determining a target value to which to reduce the torque converter slip; determining a recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value; and utilizing the recovery profile to controllably reduce the torque controller slip; and wherein determining the recovery profile commands reducing slip through the profile at commanded torque converter slip values selected to prevent the torque converter slip from reaching zero. Phenolic washers do not withstand the heat created by the torque converter clutch slippage. Lag between the commanded torque converter slip values and measured or resulting torque converter slip values, when present, result from the response of the torque converter, the torque converter clutch, and the rest of the related hardware to changing commands. 3. Notice that we set everything to 90. FIG. According to one method, a desired torque converter slip value from just before the tip-in throttle demand was initiated can be used as a target value. (Pictured below) For the A/C Off section – you must ZERO/0 each individual gear. with converter slip Steering Wheel and Seat Track Vibration are drastically reduced by slipping Torque Converter Results “We ran the model for different values of desired slip rpm across a broad range of engine rpm,” Mario Felice said. The rest of the time, the input and output will move at different speeds relative to each other. As depicted in FIG. Such rapid changes in torque can result from throttle demands by the operator. 1 is a block diagram showing various drive-train components of a vehicle, in accordance with the present disclosure; FIG. 3 illustrates an exemplary process whereby a recovery profile can be implemented to control torque converter slip, in accordance with the present disclosure; and. Navigate to Torque Converter > General. Discover a universal assistant for all of your unit conversion needs - download the free demo version right away! A tip-in throttle demand describes a rapid increase in throttle demand or output torque request by the operator. Torque converter slip is controlled by application of the TCC. The sharp increase in throttle demand results in a sharp increase in NE and TE (not depicted), resulting in a sharp increase in measured torque converter slip as depicted in the graph. As a result, a peak or maximum torque converter slip value is measured and can be identified based upon subsequent changes in the maximum torque converter slip. setting the target value to the last desired torque converter slip value monitored prior to the rapid increase in the engine torque command. Sharp increases in throttle demand have a limit, and eventually the throttle demand and the resulting engine output stabilize or reduce. A fully locked mode as just described, a fully released mode and a controlled slip mode. Ummmm, Bill? When the TCC is fully released, the fluidic interaction between the impeller and the turbine control slip. determines a feed forward pressure command based upon the engine load; monitors a desired torque converter slip; determines a difference between the measured torque converter slip and the desired torque converter slip; determine a feedback pressure command based upon the difference; upon indication of the tip-in throttle demand, freeze the feedback pressure command; and. A powertrain includes an engine, a transmission, and a torque converter located between the engine and the transmission. The torque converter clutch slip control system adopted in the Toyota A541E automatic transaxle engages the torque converter clutch by applying a steady slip speed to prevent the torque fluctuation of the engine to be transmitted to the drivetrain while enhancing the transmission efficiency of the torque converter. For the Use DOD Slip section – turn the switch to Disabled and then ZERO/0 the individual gears also. Process 200 differs at 216, wherein terms defining the recovery profile are merged using a first order lag filter, thereby smoothing the recovery profile and the resulting controlled changes to torque converter slip. determining a rate of change of the throttle position sensor; comparing the rate of change of the throttle position sensor to a threshold rate of change; and. When your vehicle is slowly coming to a halt, the torque converter only receives a small amount of torque. This torque-improving device was the first torque converter in use and, since it incorporated the stator (reaction member) to multiply torque, it formed the basic design for all modern torque converters. One or more embodiments will now be described, by way of example, with reference to the accompanying drawings, in which: FIG. In one exemplary embodiment, the feed forward term is based upon engine torque, with the feed forward term increasing with increasing engine torque. 16. The profile shape can be utilized based upon such shapes or equations, and the profile shape can include further data manipulation methods known in the art. defining the recovery profile based upon a desired slip per unit time measure. The TCC solenoid regulates the fluid pressure to the clutch. FIG. The rest of the time, the input and output will move at different speeds relative to each other. A tip-in throttle demand describes a rapid increase in throttle demand or output torque request by the operator. difference between input and output speeds, Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion, Inputs being a function of torque or torque demand, Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal, Rate of change of accelerator position, i.e. 2, wherein a recovery profile operation period is described to not only include the period of the downward sloping recovery profile but also a period terminating when the measured torque converter slip value equals the target value. At 104, a monitored TPS is analyzed to determine a range of change of TPS, using a Kalman filter or other similar methods known in the art. Assignors: OTANEZ, PAUL G., LEE, CHUNHAO J., SAMIE, FARZAD, Assigned to UAW RETIREE MEDICAL BENEFITS TRUST. Signs of a Bad Torque Converter. This threshold rate of change in TPS can be selected by a number of methods to indicate a rapid increase in throttle demand, such as by calibration or modeling sufficient to describe torque converter slip response to a change in TPS. I switched from a junk converter slipping that much to a tight well built version and picked up .3 and 4mph behind a healthy smallblock (10.2's at 127mph) At 114, the recovery profile is determined based upon the designated maximum slip value, a desired torque converter slip value (the target value described above), a selected profile shape, and a recovery time or set transition time. The controller 36, as described above, can describe a single device or a number of devices. Preferred transitions for the recovery profile quickly control the torque converter slip to the target value with no effect to drivability in form of jerky torque pulses and avoiding the toque converter slip overshooting the target value to zero slip. Torque converter slippage is important during acceleration, but it becomes a liability once the vehicle reaches cruising speed. However, the resulting rapid decrease in torque converter slip through known methods to reestablish control over torque converter slip frequently drive the torque converter slip to zero, resulting in adverse impacts to drivability, as described above. Thus, a TCC generally has three modes. Rapid changes in throttle request result in rapid changes to engine speed and torque applied to the torque converter. When the TCC is fully locked, no slip between the impeller and turbine are possible. PID, state feedback or Kalman, Control of torque converter lock-up clutches using electric control means for controlling slip, e.g. It can be beneficial to maintain the commanded torque converter slip values at the target value for some period, thereby allowing the measured torque converter slip values to reduce in a controlled profile until normal methods of control can be restored. It varies from -8000 to 8000 during a WOT pull. wherein the set transition time is selected by. Process 100 is depicted including a plurality of steps and decisions to control torque converter slip. For example, a Kalman filter, a lag filter, or a similar averaging method can be used to smooth the shape of the profile. An example of a method limited the recovery profile to a maximum slope includes determining a provisional set transition time, determining a resulting slope of a recovery profile based upon the provisional set transition time, comparing the resulting slope to a maximum slope, and selecting a set transition time based upon extending the provisional set transition time if the resulting slope is greater than the maximum slope.

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