Vehicle fluid regulator valve diagnostic system

摘要

A hybrid vehicle powertrain including a hybrid transmission in power-flow communication with an electric traction motor, a fluid pump, and a flow controller electrically connected to the fluid pump. The fluid pump is configured to supply fluid at an adjustable fluid flow rate to the hybrid transmission and the electric traction motor in response to a command from the flow controller. The flow controller is electrically connected to the fluid pump and configured to controllably modulate the operating speed of the fluid pump to adjust the fluid flow rate. If the difference between an expected rate of speed change of the fluid pump and the actual rate of speed change exceeds a threshold, the flow controller may limit the total amount of electrical power supplied to the electric traction motor.

主权项

1. A hybrid vehicle powertrain comprising:
a hybrid transmission in power-flow communication with an electric traction motor; a fluid pump in fluid communication with a fluid reservoir and with the transmission and electric traction motor, the fluid pump configured to supply fluid at an adjustable fluid flow rate to the hybrid transmission and the electric traction motor; and a flow controller electrically connected to the fluid pump and configured to controllably modulate an operating speed of the fluid pump to adjust the fluid flow rate, wherein the flow controller is configured to: provide a speed command to the fluid pump, the speed command being greater than an operating speed of the pump; monitor a rate of change of the speed of the pump in response to the provided speed command; determine a difference between the monitored rate of change to an expected rate of change; compare the difference to a threshold; and limit a total amount of electrical power supplied to the electric traction motor if the difference exceeds the threshold.