Method for controlling the transfer of torque of a force-fitting shift element

摘要

Method for controlling the transfer of torque of a force-fitting shift element (K0), which can be closed by a closing pressure acting on a piston (K), whereas, in order to control the closing pressure, a control valve (V) is configured, depending on a control signal of a control unit (ECU), through the setting of the valve lift (V_s), to transmit the system pressure (p_sys) of a hydraulic circuit (K1) to the piston (K), or to reduce it as needed, whereas, upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) of the hydraulic circuit (K1) above a threshold value for the system pressure (p_sys-t), the closing pressure is controlled at least temporarily in a manner different than when it is controlled upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) below the threshold value for the system pressure (p_sys-t).

主权项

1. Method for controlling the transfer of torque of a force-fitting shift element (K0), which can be closed by a closing pressure acting on a piston (K), whereas, in order to control the closing pressure, a control valve (V) is configured, depending on a control signal of a control unit (ECU), through the setting of the valve lift (V_s), to transmit the system pressure (p_sys) of a hydraulic circuit (K1) to the piston (K), or to reduce it as needed,
characterized in that, upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) of the hydraulic circuit (K1) above a threshold value for the system pressure (p_sys-t), the closing pressure is controlled at least temporarily in a manner different than when it is controlled upon the presence of a closing request at the shift element (K0) and a prevailing system pressure (p_sys) below the threshold value for the system pressure (p_sys-t).