System for controlling torque converter temperature during torque converter stall conditions

摘要

A method and system are provided for controlling the operating temperature of a torque converter during torque converter stall conditions. The torque converter has a pump rotatably driven by an internal combustion engine and a rotatable turbine fluidly coupled to the pump. The system first determines whether the torque converter is currently in a torque converter stall condition, and, if so, determines a slip speed as a difference in rotational speeds between the pump and the turbine, determines an engine output torque limit as a function of the slip speed and a desired slip speed, and controls the operating temperature of the torque converter by limiting output torque produced by the engine based on the engine output torque limit.

主权项

1. A method, comprising:
in a control system configured to control a torque converter comprising a pump and a turbine, continuously monitoring a slip speed indicating a difference between a rotational speed of the pump and a rotational speed of the turbine; during an operating condition indicative of a torque converter stall, applying at least one torque limit to torque applied to the pump based on the difference between the rotational speed of the pump and the rotational speed of the turbine; and during an operating condition not indicative of a torque converter stall, applying no torque limit to the torque applied to the pump.