Device and method for dynamic pressure loss and valve seal-tightness testing on a four stroke internal combustion engine

摘要

An engine testing device for dynamic pressure loss and valve seal-tightness testing of a running four-stroke engine includes: a first pressure gauge detecting a pressure value in an air intake line to a cylinder of the engine and outputting a first output signal indicative of the pressure value detected; a second pressure gauge detecting a pressure value in an exhaust line of the engine and outputting a second output signal indicative of the pressure value detected; a trigger device detecting an electrical signal indicative of when a selected cylinder of the engine is the particular active cylinder; and a measured value detection device detecting the output signals of the first and second pressure gauges and an output signal of the trigger device, such that an association between points in time of the pressure measurements and the particular active cylinder is enabled.

主权项

1. An engine testing device for an internal combustion engine having a plurality of cylinders, the device comprising:
a first pressure gauge measuring at least one pressure value in an air intake line to the cylinders of the engine, and outputting a first output signal indicative of the pressure value measured by the first pressure gauge; a second pressure gauge measuring at least one pressure value in an exhaust line of the engine, and outputting a second output signal indicative of the pressure value measured by the second pressure gauge; a trigger device detecting an electrical signal indicative of when a cylinder of the engine is an active cylinder; a first adapter device configured for (i) installing a first pressure sensor of the first pressure gauge on the air intake line of the engine, (ii) accommodating the first pressure sensor, and (iii) establishing fluid and pressure communication between a line interior of the air intake line and the first pressure sensor; a second adapter device configured for (iv) installing a second pressure sensor of the second pressure gauge on the exhaust line of the engine, (v) accommodating the second pressure sensor, and (vi) establishing fluid and pressure communication between a line interior of the exhaust line and the second pressure sensor; a measured value detection device detecting (i) the output signal of the first pressure gauge, (ii) the output signal of the second pressure gauge, and (iii) an output signal of the trigger device; wherein the engine testing device is configured to simultaneously provide a first association between points in time of the pressure measurements by the first pressure gauge and the active cylinder of the engine, and provide a second association between points in time of the pressure measurements by the second pressure gauge and the active cylinder of the engine; and a display device for simultaneously displaying a first variation in pressure over time in the air intake line of the engine for each cylinder, and a second variation in pressure over time in the exhaust line of the engine for each cylinder; wherein the display device displaying an error if the first variation in pressure between at least two cylinders is greater than a selectable tolerance or if the second variation in pressure between at least two cylinders is greater than a selectable tolerance.