Adaptive control of a flow control solenoid valve

摘要

A vehicle includes an engine, first clutch, transmission, and controller. The transmission includes a gearbox, position sensors, and a fluid circuit. The gearbox contains a second clutch. The fluid circuit includes a pump and a flow control solenoid valve. The controller opens the valve via flow control signals to allow fluid to pass into or from the particular clutch it feeds. The controller executes steps of a method to determine an actual flow rate through the valve as the clutch moves, and also calculates a compensation scale factor as a ratio of the commanded and actual flow rates. The controller modifies the flow control signals in a subsequent clutch actuation using the compensation scale factor, such as by multiplying a commanded flow rate corresponding to the flow control signals by the compensation scale factor. A system includes rotatable members connected by a clutch, the controller, valve, and position sensor.

主权项

1. A vehicle comprising:
an engine having an output shaft; a first clutch; a transmission having:
an input member that is selectively connectable to the output shaft of the engine via the first clutch;a gearbox containing a second clutch;a first and a second position sensor, each of which is configured to measure a position of a respective one of the first and second clutches and output a corresponding measured position; anda fluid circuit having a fluid pump and a flow control solenoid valve, wherein the fluid pump circulates a fluid to the valve; and a controller in electrical communication with the valve, and configured to selectively open the valve via a flow control signal to thereby allow the fluid to pass into or from the clutch, wherein execution of instructions by the controller causes the controller to:
receive the measured position signals from a selected one of the first and second position sensors in response to a requested shift;determine, from the received measured position signals, an actual flow rate through the valve as the clutch moves from a first position to a second position;calculate a compensation scale factor as a ratio of a commanded flow rate and the actual flow rate; andmodify the flow control signals for a subsequent actuation of the selected clutch using the compensation scale factor.