Patent ID: 8221288
Filing Date: 2012-07-17
Classification: F16H,Y10S,Y10T

Abstract:
1. A method for detecting faults in an electro-hydraulic control system for a transmission, comprising initiating a delivery of fluid to the electro-hydraulic control system, adjusting regulator control signals that request a main regulator valve of the electro-hydraulic control system to develop a main line pressure, wherein adjusting regulator control signals comprises generating regulator control signals that request the main regulator valve to increase the main line pressure from a nominal level to a first pressure level and regulator control signals that request the main regulator valve to increase the main line pressure from the first pressure level to a second pressure level, receiving status signals that indicate status of a pressure switch of the electro-hydraulic control system, status of the pressure switch being based upon the main line pressure, detecting faults based upon regulator control signals requesting the main line pressure to increase to the first pressure level or the second pressure level and status signals indicative of status of the pressure switch at the corresponding first pressure level or second pressure level, and generating one or more diagnostic signals that are indicative of detected faults.