Open Access
Table 5
Parameters of tests carried out on the “Cube”.
| ≪ Cube » | ||
|---|---|---|
| Valve dynamics characteristic for full engine load at 1200 rpm and 1450 N.m | Signal frequency (Hz) | 5 |
| Total signal time (ms) | 200 | |
| Pressure application time (ms) | 13 | |
| Valve lift time (ms) | 25 + 100 (imposed by the cube) | |
| Valve lift amplitude (mm) | 9.5 | |
| Valve rest time on seat (ms) | 60 | |
| Contact load at full engine load for 1200 rpm and 1450 N.m | Force equivalent to 18 MPa for a valve (kN) | 18750 |
| Air column stiffness (kN/mm) | 4 | |
| Impact speed (mm/s) | 650 | |
| Associated kinetic energy (J) | 1.48 | |
| Return spring force upon impact (N) | 2295–7500 | |
| Stiffness of the return spring (N/mm) | 4000 | |
| Contact temperature (°C) | 250–350 | |
| Flow at the origin of the environment at full load for 1200 rpm and 1450 N.m | Gas flow at the intake (m3/h by valve) | 21.3 |
| Recirculating exhaust gas flow (m3/h by valve) | 21.3 | |
| Burned diesel recirculating on intake (l/h by valve) | 1 | |
| Burnt oil recirculating on intake (g/h by valve) | 1.7 | |
| Stiffness of the mechanism | Note: the stiffness of all components must be considered in the test bench (valve, seat, spring, cylinder head gasket, cylinder head, engine block, cylinder head screw) | Yes |
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