Lock up clutch controls—high idle set point

摘要

An engine control system is provided where the engine control system includes a torque converter, an engine connected to the torque converter, a transmission connected to the torque converter, a lock-up clutch housed in the torque converter wherein the lock-up clutch is configured to mechanically connect the engine and the transmission when the lock-up clutch is engaged, an engine speed sensor configured to obtain a prior engine speed which is measured prior to engagement of the lock-up clutch, a transmission speed sensor configured to obtain a prior transmission speed which is measured prior to the engagement of the lock-up clutch, and an engine control module configured to determine a desired engine speed at a speed lower than the prior engine speed and adjust a speed of the engine to the desired engine speed just prior to the movement of the lock-up clutch for the engagement or as the lock-up clutch moves toward the engagement.

主权项

1. An engine control system, comprising:
a torque converter; an engine operatively connected to the torque converter; a transmission operatively connected to the torque converter; a lock-up clutch housed in the torque converter wherein the lock-up clutch is configured to mechanically connect the engine and the transmission when the lock-up clutch is engaged; an engine speed sensor configured to obtain a prior engine speed which is measured prior to engagement of the lock-up clutch; a transmission speed sensor configured to obtain a prior transmission speed which is measured prior to the engagement of the lock-up clutch; an engine control module configured to:
determine a desired engine speed at a speed lower than the prior engine speed;lower a speed of the engine to the desired engine speed at least one of just prior to the movement of the lock-up clutch and as the lock-up clutch moves toward the engagement; andwherein the engine control module is further configured to determine the desired engine speed as a function of increase in efficiency of the torque converter due to the lock-up clutch engagement.