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مکانیک::
موتور چندسیلندر
However, this method is not easy to use on multicylinder engines, both because of cylinder-to-cylinder differences in indicated power and due to the difficulties in obtaining sufficiently accurate pressure data.
In the Morse test, individual cylinders in a multicylinder engine are cut out from firing, and the reduction in brake torque is determined while maintaining the same engine speed.
Calculations of intake and exhaust flows using these techniques predict the variations in intake and exhaust manifold pressure with crank angle (as shown, for example, in Fig. 6-7), in single and multicylinder engines, with acceptable accuracy.7,9 Measured volumetric efficiency variations with engine speed, manifold design, and valve dimensions and timing are adequately predicted also.
Most engines are multicylinder engines and the individual cylinders interact via the intake and exhaust manifolds.
Such models have been used to examine steady-state engine operation at constant load and speed (where time-varying conditions in the manifolds due to individual cylinder filling and emptying events affect multicylinder engine behavior), and how the total system responds to changes in load and speed during engine transients.
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