Measuring and testing – Vehicle chassis – Steering
Patent
1976-04-05
1976-12-14
Myracle, Jerry W.
Measuring and testing
Vehicle chassis
Steering
G01M 1500
Patent
active
039967930
ABSTRACT:
A pressure control test apparatus which provides a simulation of various ambient operating conditions to a test unit such as an internal combustion engine and the like, the apparatus including a plenum chamber having air therein under closely controlled temperature and pressure limits, an intake blower for supplying air into said plenum chamber and an intake valve operable to modulate flow of air between the intake blower and the plenum chamber, an exhaust blower operative to exhaust gas from the plenum chamber and an exhaust valve positioned between the exhaust blower and the plenum chamber operable to modulate flow of gas therebetween, the plenum chamber further defining an inlet and an outlet, the inlet being connected to an intake conduit to supply air to the air intake of a test unit and the outlet communicating with an exhaust conduit for receiving exhausted gas from the test unit and returning same to the plenum chamber, also further including an exhaust gas cooler positioned within the exhaust conduit for cooling the temperature of exhausted gas from the test unit down to approximately the temperature of the air traveling through the intake conduit, the exhaust cooling system further including a temperature sensing means such as a thermocouple or the like positioned adjacent the outlet in the exhaust conduit to sense gas temperature therein, the temperature sensing means communicating to an exhaust gas temperature control means which modulates a fluid regulating valve for controlling the amount of cooling fluid passing through the exhaust gas cooler and thereby controlling the cooling of the exhausted gas passing through the exhaust conduit, the apparatus further including an air valve control means adapted to be responsive to the air pressure within the intake conduit to control the modulating characteristics of the intake and exhaust valves of the plenum chamber.
REFERENCES:
patent: 2357625 (1944-09-01), Armbruster
patent: 2615331 (1952-10-01), Lundgren
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