Gm Global Technolgoy Operations, Inc.

Raymond J Sapienza

James Arthur Cole

Christopher James Martone

Paul J Boor

Tony J Deschutter

Daniel Gerald Jones

Robbie D Cannon

Joseph E Safran

Daniel W Doubleday

A method of testing a pressurized liquid fluid for dissolved gasses includes evacuating both a first tank and a second tank. A test volume of a pressurized liquid fluid is introduced into the first tank. An initial absolute pressure in the second tank is sensed, and then fluid communication between the first tank and the second tank is opened to allow the pressurized fluid to flow from the first tank into the second tank, thereby de-pressurizing the fluid. The de-pressurized fluid in the second tank is maintained for a pre-defined out-gassing period, to allow any gasses in the de-pressurized fluid to separate from the de-pressurized fluid. A final absolute pressure in the second tank is sensed. A difference between the final absolute pressure and the initial absolute pressure is correlated to a volume of gasses released from the de-pressurized fluid.

Fluid testing device, and a method of testing a pressurized fluid for dissolved and/or entrained gasses

A method of tensioning a park brake system of a vehicle includes providing an adjustment mechanism having a nut in threaded engagement with a rod that defines a signal to noise ratio therebetween. The nut is advanced on the rod to remove slack until torque applied to the nut indicates that the park cables include a tension equal to an offset tension level. The nut is then retracted on the rod to introduce slack into the park cables and reduce the tension in the park cables to a target slack tension level. A signal to noise ratio between the nut and the rod is improved so that the cable tension may be predicted by the torque required to turn the nut on the rod, thereby allowing a torque indicating tool to measure the tension in the park cables my measuring the torque required to turn the nut on the rod.

Method and system for tensioning park brake cables

A portable air pressure decay test apparatus for leak testing of a sealed system includes a hollow housing, an air pump having an inlet and an outlet disposed in the housing, and a controller disposed in the housing and connected to the pump for controlling the operation of the pump. A test head is mounted on the housing for releasably attaching to an attachment point of a sealed system. The test head is in fluid communication with the outlet of the pump. When the test head is attached to the attachment point of the sealed system, the controller operates the pump to provide pressured air to the sealed system and raise the pressure in the sealed system to a predetermined value. After the predetermined value of pressure is reached, the controller stops the pump and monitors the air pressure in the sealed system for a predetermined time interval to measure an air pressure decay rate. The controller then compares the measured air pressure decay rate with a predetermined air pressure decay rate to indicate if a leak rate of the sealed system is acceptable. The apparatus preferably includes a power source connected to the pump and the controller disposed in the housing. The power source is preferably a removable battery or the like.

Self-contained portable air pressure decay test apparatus

Growing community of inventors

Fenton, MI, United States of America

Raymond J Sapienza