Apparatus and method for controlling the end of fill of a fluid actuated clutch

Abstract

The present invention discloses a system and a method for controlling the timing of the filling of a fluid actuate. The system includes, a fluid actuated clutch 83, an electronic controller adapted to detect an end-of-fill point for the fluid actuated clutch 83, compare the end-of-fill point with a desired end-of-fill point and adjust at least one of a plurality of clutch fill parameters in response to the comparison in order to control the timing of the filling of the clutch 83, and a control valve that is activated by the electronic controller.

Description

TECHNICAL FIELDThis invention relates generally to a method of clutch control and, more particularly, to a method of controlling the end-of-fill point for a fluid actuated clutch.BACKGROUND ARTIn general, the output shaft of an engine is typically connected to an input shaft of a torque converter and an output shaft of a torque converter is typically connected to an input shaft of a transmission. The lock-up clutch is located between the input shaft and output shaft of a torque converter so as to provide a rotatable connection. An electronic control system is typically utilized to smoothly engage and disengage a fluid actuated clutch. The clutch is interfaced to an associated solenoid valve through the electronic control system. The solenoid valve is modulated to control the clutch pressure in response to command signals from the electronic control system.To precisely time the engagement of the clutch, the fill time is an important parameter. Fill time is defined as the time require...

AI Technical Summary

Problems solved by technology

However, until the clutch plates are compressed together, the clutch cannot transmit any significant torque.

A harsh engagement can result in a torque spike that is transmitted through the drivetrain of the machine and creates a "jerk".

This jerk is uncomfortable to the operator and diminishes the life expectancy of the associated drivetrain components of the machine.

A major drawback with this arrangement is that it requires all fluid to flow through a fixed orifice and also through a separate flow sensing switch for each clutch in the system.

These arrangements do not account for variances in control valves or clutch activating chambers.

However, these control schemes depend on costly and time consuming calibration techniques.

This creates an electrical voltage spike that is detected by an electronic controller.

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