Abstract: A shift control method of an automatic transmission includes the steps of: determining whether a road has a gradient; calculating road gradient in real time; filtering the gradient; controlling shifting according to the greater of calculated and filtered gradients if the calculated gradient is negative; and controlling shifting according to the calculated gradient if the calculated gradient is positive.

Abstract: The upshift control method of an automatic transmission for vehicles includes determining whether a start condition of a damper clutch control operation is satisfied during an upshift under a power-off. The method also includes executing the damper clutch control operation depending on predetermined control intervals and control duties in order to enhance a shift feel, the predetermined control intervals and control duties being set on the basis of a shift speed, a turbine RPM, and a transmission oil temperature, when the start condition of the damper clutch operation control is satisfied. The method further includes executing a fuel cut control after a damper clutch is engaged by the damper clutch control operation.

Abstract: Fuel mileage and shift feel are significantly enhanced from an upshift control method of an automatic transmission that includes determining whether a fuel cut control is executed when the damper clutch is in the direct engagement state before an upshift. Performing a hydraulic pressure duty control for the damper clutch, on the basis of at least one control parameter, such that a shift feel is enhanced while the upshift is being progressed and the fuel cut control is executed.

Abstract: A shift control method and system for an automatic transmission. The control method includes calculating a clutch engaging pressure for each shift speed corresponding to an engine load and calculating an optimal engaging pressure for an operating clutch in each shift ratio. The system includes a control unit and sensors for executing the method.

Abstract: A shift control method for an automatic transmission is provided that includes: an ECU control of generating a throttle compensation control flag having data for whether a shift delay is needed, and of transmitting the generated throttle compensation control flag to a TCU, when a throttle opening rate is controlled in such a way that the throttle opening rate is not proportional to a depression of an acceleration pedal; and a TCU control of delaying a gear shift for a predetermined shift delay time period if it is determined that the shift delay is needed by reading the transmitted throttle compensation control flag, and of performing the gear shift.

Abstract: A power Off upshift control method for an automatic transmission includes the steps of: a) determining if a vehicle is under conditions requiring power Off upshift control; b) starting power Off upshift duty control if the conditions are satisfied; c) calculating average turbine rpm change rate; d) measuring turbine rpm changing period and determining if the turbine rpm changing period is greater than a predetermined value; e) calculating a shift finish point if the turbine rpm changing period is greater than the predetermined value; f) determining if the turbine rpm change rate is less than a value obtained by adding a mapping value to the turbine rpm change rate; g) determining if the turbine rpm value is greater than or equal to the shift finish point, if the turbine rpm change rate is greater than the mapped value in the previous step; h) producing a shift finish point duty rate if the turbine rpm value is greater than or equal to the shift finish point; i) determining if the turbine rpm is less than a ta

Abstract: A damper clutch control method comprising the steps of detecting a throttle opening, an engine rpm and an turbine rpm; performing lift-foot-up shifting if throttle opening is abruptly decreased; determining if a difference in engine rpm and turbine rpm is below a predetermined value; and duty controlling a damper clutch if the difference in engine rpm and turbine rpm is below the predetermined value.

Abstract: A shift control method for an automatic transmission is provided that includes: an ECU control of generating a throttle compensation control flag having data for whether a shift delay is needed, and of transmitting the generated throttle compensation control flag to a TCU, when a throttle opening rate is controlled in such a way that the throttle opening rate is not proportional to a depression of an acceleration pedal; and a TCU control of delaying a gear shift for a predetermined shift delay time period if it is determined that the shift delay is needed by reading the transmitted throttle compensation control flag, and of performing the gear shift.

Abstract: Disclosed is a method for controlling runup comprising the steps performing upshifting from a second speed to a third speed if throttle opening and vehicle speed are at predetermined levels; determining if runup occurring at the point where upshifting from the second speed to the third speed is performed, the determination of the occurrence of runup being performed based on turbine rpm, transmission output rpm and a second speed gear ratio; determining if a time rate of change in turbine rpm is less than 0 if runup is occurring; reducing a duty for a predetermined time period if the time rate of change in turbine rpm is greater than 0; and performing feedback control if the time rate of change in turbine rpm is less than 0.

Abstract: A shift control method for an automatic transmission includes the steps of determining if upshift conditions are satisfied; determining if throttle valve opening is below a power on/off check line if upshift conditions are satisfied; determining, if throttle valve opening is below the power on/off check line, whether a change in throttle valve opening in a closed direction is less than a predetermined value; and preventing upshifting if the change in throttle valve opening in the closed direction is less than the predetermined value.

Abstract: A power Off upshift control method for an automatic transmission includes the steps of determining, during an upshift operation, if power Off upshifting is taking place; determining if power Off upshift conditions are satisfied; measuring a hydraulic pressure response time, establishing a maximum duty value for preventing forced shifting, and calculating the hydraulic pressure response time when the maximum duty value changes to 100% duty, these processes being performed if the power Off upshift conditions are satisfied; calculating a shift finish point after the hydraulic pressure response time is calculated; determining if the shift finish point corresponds to an actual shift finish point; and setting the maximum duty value at 100% duty if the shift finish point corresponds to the actual shift finish point.

Abstract: A shift control method for an automatic transmission which includes converting to a lean-burn mode from a normal mode if throttle voltage is less than a first predetermined value; determining if tip-in has occurred in the lean-burn mode using accelerator pedal signals; increasing the throttle valve opening if it is determined that the throttle voltage has increased by a second predetermined value such that engine rpm is increased; determining if the difference between engine rpm and turbine rpm is greater than a predetermined number of rpm; and converting from the lean-burn mode to the normal mode if the engine rpm are greater than the turbine rpm by the predetermined number of rpm.

Abstract: A power Off upshift control method for an automatic transmission includes the steps of: a) determining if a vehicle is under conditions requiring power Off upshift control; b) starting power Off upshift duty control if the conditions are satisfied; c) calculating average turbine rpm change rate; d) measuring turbine rpm changing period and determining if the turbine rpm changing period is greater than a predetermined value; e) calculating a shift finish point if the turbine rpm changing period is greater than the predetermined value; f) determining if the turbine rpm change rate is less than a value obtained by adding a mapping value to the turbine rpm change rate; g) determining if the turbine rpm value is greater than or equal to the shift finish point, if the turbine rpm change rate is greater than the mapped value in the previous step; h) producing a shift finish point duty rate if the turbine rpm value is greater than or equal to the shift finish point; i) determining if the turbine rpm is less than a ta

Abstract: A hydraulic control system for automatic transmissions includes a pressure control valve for regulating hydraulic pressure generated by a hydraulic pump to line pressure, a manual valve for converting the line pressure from the pressure control valve into drive pressure, a solenoid supply valve for reducing the line pressure from the pressure control valve, a torque control regulator valve controlled by the reduced pressure from the solenoid supply valve to convert the drive pressure from the manual valve into torque pressure that is lower than the drive pressure, and a shift valve for supplying the torque pressure from the torque control regulator valve to friction elements during an initial stage of a shift operation, then replacing the torque pressure with the drive pressure from the manual valve at an end of the shift operation.