| 摘要 |
<p>A fuel injection system for a stratified charge hybrid internal combustion engine includes a main combustion chamber and a precombustion chamber, and fuel injectors (56, 54) in both the main chamber and the precombustion chamber which open at higher and lower pressure levels respectively to sequentially inject fuel into the precombustion chamber and main chamber. The system also includes a timed-spark ignition trigger (58) in the precombustion chamber, and an engine-driven and timed fuel injection pump (12) having a variable output capacity which varies with the engine power level requirements, the injection pump (12) being supplied by a low pressure charge pump (26). The injection system further includes a shuttle valve (30) with a shuttle spool (36) positioned therein defining a precombustion chamber supply chamber (40) on one side thereof and a spool activation chamber (38) on the opposite side. An initial charge from the injection pump (12) displaces the spool (36) from its first (right-hand) to its second (left-hand) position. The initial part of this displacement valves-off the supply of fuel into the supply chamber (40), and further displacement causes the spool (36) to supply a charge of fuel to the prechamber injector (54) until the spool reaches its second position defined by a stop (61). Thereafter, the fuel pressure from the injection pump (12) acting in the spool actuation chamber (38) rises to the opening pressure level of the main injector (56), and fuel flows through the spool actuation chamber to the main injector. The trigger (58) positioned in the shuttle valve fires the ignition means as the spool moves from its first position. <IMAGE></p> |
