| 摘要 |
An apparatus for altimetric conditioning of the intake and the exhaust of internal-combustion engines, comprising:
- a controlled-pressure volume (14) isolated from the external environment;
- an intake duct (16) and an exhaust duct (18) in communication with said controlled-pressure volume (14) and the engine;
- a first volumetric blower (34) and a second volumetric blower (36), wherein the intake section (38) of the first volumetric blower (34) draws a first flow of gas from the external environment and sends said first flow of gas into said controlled-pressure volume (14) and wherein the intake section (40) of the second volumetric blower (36) draws a second flow of gas from said controlled-pressure volume (14) and sends said second flow of gas towards the external environment; and
- a control unit (56), provided for varying the relative speed of operation of the first volumetric blower (34) and/or of the second volumetric blower (36) for maintaining in said controlled-pressure volume (14) a desired testing pressure.
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