ADAPTIVE CONTROL OF A LINEAR ACTUATOR

摘要

A vehicle or other system includes hydraulic fluid, an actuatable device such as a clutch that includes a linear actuator, e.g., a clutch piston. The linear actuator is moveable via a pressure from the fluid to actuate the actuatable device. A position sensor measures and outputs a position of the linear actuator as a position signal. A controller is programmed to generate increasing and decreasing position-to-pressure (PTP) curves via measurement of the position, at a predetermined time, in response to a series of respectively increasing and decreasing pressure step commands. The controller adjusts the PTP curves using a calibrated set of offsets, locates a PTP point in a hysteresis range between the adjusted PTP curves, and controls the device using the PTP point. The offsets may include a temperature of the fluid, velocity of the linear actuator, and/or an engine speed.

主权项

1. A system comprising:
hydraulic fluid; an actuatable device that includes a linear actuator, wherein the linear actuator is moveable via the hydraulic fluid to thereby actuate the actuatable device; a position sensor operable to measure a position of the linear actuator and output the measured position as a position signal; and a controller in electrical communication with the actuatable device and the position sensor, wherein the controller is programmed to:
transmit a series of respectively increasing and decreasing pressure step commands to the linear actuator;generate respective increasing and decreasing position-to-pressure (PTP) curves at a predetermined time using the measured position in response to transmitting the series of respectively increasing and decreasing pressure step commands;adjust the increasing and decreasing PTP curves using a calibrated set of offsets;locate a PTP point in a hysteresis range between the adjusted increasing and a decreasing PTP curves; andcontrol the actuatable device using the located PTP point.