Patent ID: 8437932
Filing Date: 2013-05-07
Classification: B60W,F16H,Y10T

Abstract:
1. A method, comprising, at an electronic control module for a transmission: generating regulator control signals that cause a main regulator valve of the transmission to develop a main line pressure having a first pressure level and a control main valve of the transmission to develop a control main pressure based upon the main line pressure, generating clutch control signals that cause a clutch trim valve of the transmission to develop from the control main pressure a clutch control pressure that defines a threshold pressure level, the threshold pressure level corresponding to a transition point between a regulating state and a non-regulating state of the clutch trim valve, the regulating state being a state in which the clutch trim valve is neither fully stroked nor fully destroked, adjusting regulator control signals to cause the main regulator valve to adjust the main line pressure toward a second pressure level, receiving status signals from the clutch trim valve that indicates whether the clutch trim valve is in the regulating state, generating one or more calibration parameters based upon regulator control signals that caused receipt of status signals that indicate a transition between the regulating state and the non-regulating state, and modulating the main line pressure developed by the main regulator valve by generating further regulator control signals based upon the one or more calibration parameters.