CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Any rapid or sudden change in engine torque includes the potential to create a corresponding increase in torque converter slip. Determining the recovery profile includes commanding reducing slip through the profile at commanded torque converter slip values selected to prevent the torque converter slip from reaching zero. If this is the case, a faulty torque converter is probably the cause. The purpose of the lockup clutch is to directly connect the engine and the transmission once slippage is no longer needed. As a result, this feedback term could cause unpredictable or jerky motion in the torque converter, for example, resulting in a crash to zero slip in the torque converter. Additionally, the recovery profile is set to recover the torque converter slip to the new desired torque converter slip in a controllable manner so as to avoid overshoot of the new desired torque converter slip, ensuring that torque converter slip does not reach zero. The vehicle 10 also includes a controller 36 intended to represent both an engine controller and a transmission controller; however, it will be appreciated that these two controlling functions can be served by a single device or a plurality of communicably connected devices. Any insights or advice would be greatly appreciated. pedal or throttle change gradient, Inputs being a function of speed dependent on a comparison between speeds, Detecting slip, e.g. As a result, a method is disclosed to freeze the slip-based feedback pressure command term at the detection of a tip-in transition, while maintaining the feed forward term through the tip-in transition. Page 1 of 2 1 2 Last. HP Tuners has had this for a while now and the only way to dial in an aftermarket converter, especially multi disc properly. Excess slip reduces fuel efficiency of the powertrain and torque output to the output shaft and must be reduced in a timely method. 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. One having ordinary skill in the art will appreciate that systems responding to a change in input, when the response is too fast, tend to overshoot the target value. In this way, feedback control can be utilized to control torque converter slip to a desired value. An output shaft of the transmission 14, represented as line 28, is coupled to a driveline 30 of the vehicle 10 that distributes the engine power to the vehicle wheels in a manner that is well understood to those having ordinary skill in the art. A desired torque converter slip can be monitored, a pressure command to the TCC can be modulated in order to control resulting torque converter slip, and the resulting torque converter slip can be used in a feedback loop to subsequently modulate the pressure command to the TCC. Hey Saeb, or anyone else. The TCC solenoid regulates the fluid pressure to the clutch. & Terms of Use. 54 Posts . We often take torque converters for granted, but their implementation was a tremendous breakthrough in the development of modern automatic transmissions. The powertrain components include an engine 12 and a transmission 14. Other methods are disclosed, including directly monitoring engine torque, monitoring an air flow mass sensor to estimate engine torque through changes to input air flow, monitoring fuel mass injected into the engine to similarly estimate engine torque through changes in fuel mass injected, and monitoring signals normally sent from the engine to the transmission describing changes in engine torque. This response must be taken into account when determining the recovery profile. A TCC 22 sets a torque converter slip in the torque converter 18 between the engine 12 and the transmission 14, as discussed above. A slip control system of a lockup torque converter includes a pre-compensator that pre-compensates for a target slip-rotation speed to produce a target slip-rotation speed correction value. FIG. T43 Torque Converter Desired Slip. Faulty Torque Converter Clutch Plate. The feed forward term can be based upon many different factors affecting torque applied through the torque converter. A sensor 42 measures the output behavior of the transmission 14. Such a maintaining of the target value is described in FIG. a desired torque converter slip. That's how they're able to get rid of the clutch pedal. Additionally, the recovery profile is set to recover the torque converter slip to the new desired torque converter slip in a controllable manner so as to avoid overshoot of the new desired torque converter slip, ensuring that torque converter slip does not reach zero. In this way, feedback control can be utilized to control torque converter slip to a desired value. Discover a universal assistant for all of your unit conversion needs - download the free demo version right away! For fault determination, the TCM monitors the amount of torque converter slip ONLY when the TCC is in Slip Mode operation. One having ordinary skill in the art will appreciate that this is an exemplary transition time for the particular hardware configuration operating at a set of particular conditions. T43 Torque Converter Desired Slip Have the functions for Torque Converter Desired Slip time been added to T43? The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. When the TCC is fully locked, no slip between the impeller and turbine are possible. For street engines, this means limiting camshafts to 230-degree duration at .050-inch lift, advancing the cam no more than two to four degrees, and using a small cfm carburetor when possible. However, responses that are too slow incur unnecessary delays upon the system. The torque converter uses hydraulic fluid to transfer rotational energy from the impeller to the turbine. Jump to page: August 11th, 2011. A combination of feedforward pressure control and slip speed feedback compensation is used when the TCC actively controls the slip at the clutch. The TCC includes structures mechanically, electronically, or fluidically operated to controllably couple the impeller and turbine of the torque converter, modulating an allowed slip therebetween. Rapid increases in engine speed and/or torque can result in torque slip changing from a controlled value to an excessive value that must be controlled back to a controlled value. The rotational speed of the impeller relative to the turbine in the torque converter is typically different so that there is a converter slip therebetween. Printable View. Such rapid changes in torque can result from throttle demands by the operator. 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. FIG. Operate the vehicle at 30 mph while maintaining third gear. A feed forward term changing roughly proportionally to engine torque would increase in a tip-in event, but because the feed forward term is responsive to engine torque, the increases to each are proportional. One having ordinary skill in the art will appreciate that control of torque converter slip can be controlled by feedback control, feed forward control, or other similar control methods. Other methods to set a linear or nearly linear transition are envisioned, including setting the slope of the recovery profile through the transition according to a desired slip per unit time measure or limiting a recovery profile to a maximum slope. Methods are known to reestablish control over torque converter slip after a tip-in throttle demand. 12/043,499, titled Aggressive Torque Converter Clutch Slip Control Design Through Driveline Torsional Velocity Measurements, filed Mar. utilizing a quadratic equation in commanded torque converter slip to reduce the torque converter slip to the target value. The controller is equipped with a microprocessor including a memory storage device and is capable of executing programming to operate methods described herein. For a converter to operate properly, the engine needs to make as much low and midrange torque as possible in the same rpm range the converter is rated for. Sharp increases in throttle demand have a limit, and eventually the throttle demand and the resulting engine output stabilize or reduce. 2 utilizes this peak to define an initial value for the recovery profile at or near the peak measured torque converter slip value. Rate of change in TPS can be calculated in a number of ways, for example, through direct numerical differentiation, operation of Kalman Filter, or other methods known in the art. HP Tuners has had this for a while now and the only way to dial in an aftermarket converter, especially multi disc properly. In this exemplary embodiment, the set transition time is available based factors describing the transition to be accomplished, for example including transmission gear and engine torque. Figure 3 shows this relation for a stalled converter. At 218, feedback control of the torque converter to modulate clutch slip according to methods known in the art is enabled. Low pressure inside the torque converter will cause slippage, overheating, and other strange symptoms. Similarly, splines can be utilized by methods known in the art to construct the resulting profile. In the log I have selected RPM, Desired Throttle Angle and Torque Converter Slip. Desired torque converter clutch slip feedback recovery algorithm for tip-in maneuvers, Application filed by GM Global Technology Operations LLC. The TCC can also mechanically lock the impeller at the output of the engine to the turbine at the input of the transmission so that the engine and transmission rotate at the same speed. By reducing the pressure of the hydraulic fluid in the torque converter, torque converter slip for a given operating condition will increase. utilizing the recovery profile to controllably reduce the torque controller slip; wherein determining the recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value comprises commanding reducing said torque converter slip at commanded torque converter slip values selected to prevent the torque converter from reaching a zero slip condition. Therefore, it is intended that the disclosure not be limited to the particular embodiment(s) disclosed as the best mode contemplated for carrying out this disclosure, but that the disclosure will include all embodiments falling within the scope of the appended claims. As described above, the measured torque converter slip increases sharply in response to the increase in throttle demand indicated by the tip-in throttle demand indication. A powertrain includes an engine, a transmission, and a torque converter located between the engine and the transmission. As described above, rapid increases in engine speed and/or torque can result in torque slip changing from a controlled value to an excessive value that must be controlled back to a controlled value. Once the clutch plate is fully engaged against the pressure plate, both must turn together at the same speed. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OTANEZ, PAUL G.;LEE, CHUNHAO J.;SAMIE, FARZAD;SIGNING DATES FROM 20090902 TO 20090904;REEL/FRAME:023204/0594, Owner name: The exemplary method utilized in FIG. As depicted in FIG. The type of torque converter you choose depends upon how you intend to drive the vehicle. Torque converter slip is controlled by application of the TCC. Torque Converter Commanded is 0, but the slip PID is all over the place. 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. For this reason torque is frequently informally referred to as "rotational force". Other profile shapes besides linear are envisioned including any mathematical expression transitioning from the initial value to the target value, for example including a second, third, or higher order function, defined, for example, by a corresponding quadratic equation, to transition within the recovery profile. A method to controllably reduce the torque converter slip to a desired torque converter slip can be described by comparing and controlling the measured torque converter slip to a recovery profile. Although the TCC control system reacts to a tip-in by increasing the TCC commanded hydraulic pressure, the TCC hydraulic system response is not fast enough to react to a rapid change of engine torque, thereby causing a large gap between the commanded TCC pressure and the resulting TCC pressure. Recommend replacing torque converter or transmission to bring vehicle back to normal operation at high gear loads. While torque converter slip can be controlled to some small value in steady state operation, rapid and significant increases in NE and TE consistent with tip-in throttle demands are known to result in rapid increases in torque converter slip. This is done to prevent the TCC feedback (closed loop) control system from increasing the TCC hydraulic pressure as a response to the sudden increase in TCC measured slip. That's why virtually all modern torque converters use a lock-up clutch. Converter Slip Calculator. In the slip mode, the slip between the torque converter impeller and turbine is set so that it does not exceed a predetermine amount by controlling the pressure of the hydraulic fluid in the TCC. Such a variable-based set transition time can be made available through a look-up table, a variable based function, or through modeling. A malfunctioning torque converter can have a shudder that comes from the transmission. They are bolted to the engine and provide a fluid coupling to the transmission. Optimum Tire Height Based on MPH, RPM, Converter Slip & Rear Gear Enter the Rearend Gear Ratio, the 1/4 Mile MPH, the RPM, the Transmission top gear ratio, Conv Slip% Tire Height = (Rearend Ratio * MPH * 336.136 * Trans Ratio * (1 + (Conv Slip% / 100))) / RPM Further, feedback control of torque converter slip, described above, responding to a rapid change in torque converter slip, can result in unpredictable changes to the torque converter slip, for example, feedback induced increases in TCC pressure commands resulting in the slip quickly being reduced to zero. I am trying to figure out when the torque converter locks up on the auto. Thus, a TCC generally has three modes. Methods are known to reestablish control over torque converter slip after a tip-in throttle demand. The system includes: a mode determination module that selects one of a lock low slip regulation mode and a hard lock mode based on a lock request; and a pressure control module that regulates pressure to the torque converter during the lock low slip regulation mode such that a target slip is maintained and commands a maximum … The recovery profile includes commanded torque converter slip values and is set to quickly reduce torque converter slip, so as to avoid the reduction in fuel efficiency and corresponding loss of power to the output shaft associated with significant torque converter slip. However, one having ordinary skill in the art will appreciate that the disclosure can apply equally well to other similar commanded changes to engine torque. a desired torque converter slip. transmission and inspect the torque converter and TCC apply system. However, responses that are too slow incur unnecessary delays upon the system. A torque converter is a type of fluid coupling which transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load.In a vehicle with an automatic transmission, the torque converter connects the power source to the load.It is usually located between the engine's flexplate and the transmission. When 110 determines the maximum slip value has been reached, the process advances top 112 wherein the maximum slip value is designated. wherein determining the recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value comprises commanding reducing said torque converter slip through the profile at slip rates selected to prevent the torque converter from reaching a zero slip condition. If the change in TPS is not greater than the threshold, then the process returns to 104 to continue monitoring the TPS. CHANGE OF NAME;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS, INC.;REEL/FRAME:025781/0299, Free format text: 2, the above described method to utilize a recovery profile is exemplified. The type of torque converter you choose depends upon how you intend to drive the vehicle. approaching target slip value, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION, Interrelated power delivery controls, including engine control, GM GLOBAL TECHNOLOGY OPERATIONS, INC., MICHIGAN, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OTANEZ, PAUL G.;LEE, CHUNHAO J.;SAMIE, FARZAD;SIGNING DATES FROM 20090902 TO 20090904;REEL/FRAME:023204/0594, UNITED STATES DEPARTMENT OF THE TREASURY, DISTRICT, SECURITY AGREEMENT;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS, INC.;REEL/FRAME:023989/0155, UAW RETIREE MEDICAL BENEFITS TRUST, MICHIGAN, SECURITY AGREEMENT;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS, INC.;REEL/FRAME:023990/0001, RELEASE BY SECURED PARTY;ASSIGNOR:UNITED STATES DEPARTMENT OF THE TREASURY;REEL/FRAME:025246/0234, RELEASE BY SECURED PARTY;ASSIGNOR:UAW RETIREE MEDICAL BENEFITS TRUST;REEL/FRAME:025315/0091, SECURITY AGREEMENT;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS, INC.;REEL/FRAME:025324/0555, GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN, CHANGE OF NAME;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS, INC.;REEL/FRAME:025781/0299, RELEASE BY SECURED PARTY;ASSIGNOR:WILMINGTON TRUST COMPANY;REEL/FRAME:034185/0789, A feedback algorithm for recovering the desired torque converter clutch slip for accelerator pedal depression operations, Method of controlling a transmission clutch, Transmission and method of controlling clutch during ratio change, Model predictive control of torque converter clutch slip, Methods and system for controlling launch of a vehicle having an automatic transmission, Closed-loop feedback control and reduction of the torque converter clutch slip for enhanced drivability for heavy tip-in maneuvers, Stochastic detection of torque converter slip speed and related control, Real time estimation algorithm for torque converter clutch feed forward pressure for ECCC control, Electronically controlled bypass clutch using target slips based on percent shift completion for a torque converter transmission, Automatic transmission bypass clutch slip control using nonlinear nverse dynamics, Upshift control method of a vehicle automatic transmission, Aggressive Torque Converter Clutch Slip Control Design through Driveline Torsional Velocity Measurements, Effective driveline vibration detection algorithm in transmission tcc slip control, Lock-up clutch control device for automatic transmission and control method thereof, Vehicle response during vehicle acceleration conditions, Adjusting clutch slip based on sensed parameter of transmission shaft to control vehicle NVH, Method for controlling a drivetrain of a vehicle, with a drive motor and a gearbox, Method and apparatus to control hydraulic pressure in an electrically variable transmission, A method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch, Method for controlling AMT system start from stop operation, Method and device for adjusting the friction coefficient of a friction clutch situated in a hybrid power train, Apparatus for controlling slip amount of motor vehicle clutch during vehicle starting, System and method of controlling the coastdown of a vehicle, Steady state slip detection/correction for a motor vehicle transmission, Method for controlling the output torque of an automatic transmission, Powershift transmission system with torque-mapped shifts, Method for a shift control of a power shift transmission, Automated manual transmission launch control, Continuously variable transmission / clutch control system, Method for operating a parallel hybrid powertrain of a vehicle with at least one internal combustion engine and at least one electric motor, Method and system for transmission utilizing centrifugal clutch to overcome transmission tooth-butt, How to automatically control the torque transmission of the automation clutch by measuring the engagement point where the vehicle's automation clutch starts torque delivery and the vehicle, Control for vehicle start from stop operation, Downshift control for automotive automatic transmission, Method and system for controlling creep in automatic transmission. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing TCI Racing Calculators JavaScript seems to be disabled in your browser. During Slip Mode, the slip speed is expected to be within a predetermined range. In one exemplary control method, the TCC controls the pressure of hydraulic fluid in the torque converter so that the torque converter slip approaches a desired value. Such variable relationships can be developed experimentally, empirically, predictively, through modeling or other techniques adequate to accurately predict powertrain operation, and a multitude of set transition times or relationships might be used for different conditions or operating ranges. Locking the impeller to the turbine is generally only used in limited circumstances because of various implications. The problem of a gradual torque take-up when moving away from a standstill has also been overcome with the introduction of a torque converter between the engine and transmission gearing so that engine to transmission slip is automatically reduced or increased according to changes in engine speed and road conditions. 2, an exemplary transition is illustrated as a linear transition between the initial value of the recovery profile to the target torque converter slip value defined by a set transition time, in this example, 1.5 seconds. Process 200 includes 202 through 214 that are substantially identical to 102 through 114, described above. 6, 2008 and incorporated herein by reference. A looser torque converter exerts less resistance on the engine. GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN, Free format text: Depending upon the lag of the measured torque converter slip to the recovery profile, the measured torque converter slip can still exceed the target value by a significant amount and the potential for overshoot of the target value can still exist, particularly if steady state control is immediately restored and the commanded torque converter slip is allowed to vary according to normal control methods. 16. In this exemplary embodiment, the set transition time is available based factors describing the transition to be accomplished, for example including transmission gear and engine torque. This combines the two separate halves of the torque converter, which improves the car’s efficiency because of reduced slippage. Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. Assignors: OTANEZ, PAUL G., LEE, CHUNHAO J., SAMIE, FARZAD, Assigned to UAW RETIREE MEDICAL BENEFITS TRUST. 3 illustrates an exemplary process whereby a recovery profile can be implemented to control torque converter slip, in accordance with the present disclosure. Further, feedback control of torque converter slip, described above, responding to a rapid change in torque converter slip, can result in unpredictable changes to the torque converter slip, for example, feedback induced increases in TCC pressure commands resulting in the slip quickly being reduced to zero. utilizing a mathematical expression to reduce the torque converter slip. No. 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. The TCC desired slip modulated between 40-80 RPM; the TCC actual slip fol-lowed the TCC desired slip within 2-3 Selection of a set transition time can be achieved by any method sufficient to predict torque converter operation through a slip reduction period. 17. For the Use DOD Slip section – turn the switch to Disabled and then ZERO/0 the individual gears also. When your vehicle is slowly coming to a halt, the torque converter only receives a small amount of torque. As depicted in FIG. Hey Saeb, or anyone else. Rate of change in TPS can be calculated in a number of ways, for example, through direct numerical differentiation, operation of Kalman Filter, or other methods known in the art. The controller 36, as described above, can describe a single device or a number of devices. 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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