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US 8,770,014 B2Granted
System for detecting hydraulic fluid leaks
AssigneeGM Global Technology Operations LLC
InventorsMike M. McDonald, William C. Albertson
Life of this patent
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Abstract
A control system and method for detecting a hydraulic system leak in an engine includes a pressure sensor that senses a first pressure reading of a hydraulic fluid supply at a first time and a second pressure reading of said hydraulic fluid supply at a second time. A comparison module calculates a pressure ratio based on the first and second pressure readings and signals a fault condition based on a relationship between the pressure ratio and a pressure threshold.
Claims11
A control system for detecting a hydraulic system leak in a vehicle powertrain, comprising:
- a filtering module that outputs filtered pressure values by filtering a pressure signal output by a pressure sensor to remove high frequency content from said pressure signal, wherein said pressure sensor senses pressures of a fluid within a gallery of a hydraulic system of said vehicle powertrain;
- a pressure reading module that determines a first pressure reading based on a first one of said filtered pressure value output before a valve of said hydraulic system is actuated and that determines a second pressure reading based on a second one of said filtered pressure values output after said valve is actuated;
- and
- a comparison module that calculates a pressure ratio of said first and second pressure readings and that signals a fault condition indicative of said hydraulic system leak based on a relationship between said pressure ratio and a pressure threshold,
- wherein said valve controls an active fuel management event of an engine of said vehicle powertrain, said active fuel management event includes deactivating a set of cylinders of said engine, and said first one of said filtered pressure values is output before said active fuel management event and said second one of said filtered pressure values is output after said active fuel management event.
2 more elements
A method for detecting a hydraulic system leak in a vehicle powertrain, comprising:
- outputting filtered pressure values by filtering a pressure signal output by a pressure sensor to remove high frequency content from said pressure signal, wherein said pressure sensor senses pressures of a fluid within a gallery of a hydraulic system of said vehicle powertrain;
- determining a first pressure reading based on a first one of said filtered pressure values output before a valve of said hydraulic system is actuated;
- determining a second pressure reading based on a second one of said filtered pressure values output after said valve is actuated;
- and
- calculating a pressure ratio of said first and second pressure readings and signaling a fault condition indicative of said hydraulic system leak based on a relationship between said pressure ratio and a pressure threshold,
- wherein said valve controls an active fuel management event of an engine of said vehicle powertrain, said active fuel management event includes deactivating a set of cylinders of said engine, and said first one of said filtered pressure values is output before said active fuel management event and said second one of said filtered pressure values is output after said active fuel management event.
3 more elements
A control system for detecting a hydraulic system leak in a vehicle powertrain, comprising:
- a pressure sensor that senses pressures of a fluid within a gallery of a hydraulic system of said vehicle powertrain and outputs a pressure signal based on said pressures;
- a filtering module that outputs filtered pressure values by filtering said pressure signal to remove high frequency content from said pressure signal;
- a pressure reading module that determines a first pressure reading based on a first one of said filtered pressure values output before a valve of said hydraulic system is actuated and a second pressure reading based on a second one of said filtered pressure values output after said valve is actuated;
- and
- a comparison module that calculates a pressure ratio of said first and second pressure readings and that signals a fault condition of said hydraulic system leak based on a relationship between said pressure ratio and a pressure threshold,
- wherein said valve controls an active fuel management event of an engine of said vehicle powertrain, said active fuel management event includes deactivating a set of cylinders of said engine, and said first one of said filtered pressure values is output before said active fuel management event and said second one of said filtered pressure values is output after said active fuel management event.
3 more elements
Dependencies are inferred from the claim text.