HYDRAULIC PUMP FAILURE DETECTION FOR TRANSMISSION WITH NORMALLY ENGAGED CLUTCH

摘要

A method of detecting a failure of a hydraulic pump includes sensing a rotational speed of the engine, and a rotational speed of a rotating drivetrain component. A numerical difference between the rotational speed of the engine and the rotational speed of the rotating drivetrain component is calculated. The numerical difference is compared to a threshold value to determine if the numerical difference is less than the threshold value, or is equal to or greater than the threshold value. A failure of the hydraulic pump is identified when the numerical difference between the rotational speed of the engine and the rotational speed of the rotating drivetrain component is equal to or greater than the threshold value, and the transmission is positioned in the neutral gear mode. When a failure of the hydraulic pump is identified, the operation of the engine is stopped.

主权项

1. A method of operating a vehicle having an engine with an automatic start/stop capability and a transmission with a normally engaged clutch, the method comprising:
sensing a rotational speed of the engine; sensing a rotational speed of a rotating drivetrain component disposed downstream of a pump of a torque converter of the transmission; comparing a numerical difference between the rotational speed of the engine and the rotational speed of the rotating drivetrain component to a threshold value to determine if the numerical difference is less than the threshold value, or if the numerical difference is equal to or greater than the threshold value; and stopping operation of the engine when the numerical difference is equal to or greater than the threshold value.