Shunt pulsation trap for positive displacement (PD) internal combustion engines (ICE)

摘要

A shunt pulsation trap for a positive displacement (PD) internal combustion engine (ICE) reduces pulsation, as well as noise, vibration and harshness (NVH), and the overall size of the exhaust system, and also improves cycle (fuel) efficiency. A shunt pulsation trap for a PD-ICE is configured to trap and attenuate gas pulsations before discharge to engine outlet and includes a chamber (trap volume) adjacent to the PD-ICE cavity. The chamber houses at least one pulsation dampening device, at least one relief port (trap inlet) branching off from the PD-ICE cavity into the pulsation trap chamber and a feedback region (trap outlet) communicating with the PD-ICE outlet. The associated methods of reducing pulsations are included as another aspect of the invention.

主权项

1. A PD-ICE, comprising:
a. a housing structure having a flow suction port, a flow discharge port, and a cavity; b. a positive displacement driving piston reciprocally mounted inside said housing cavity and driven through a reciprocating motion within said housing cavity by combustion of fuel; and c. a shunt pulsation trap apparatus comprising a trap chamber positioned adjacent to said housing cavity, at least one pulsation dampening device positioned within said trap chamber, at least one trap inlet branching off from said cavity before said discharge port and into said pulsation trap chamber upstream of the pulsation dampening device, and at least one trap outlet downstream of the pulsation dampening device and communicating said pulsation trap chamber with said discharge port; and d. wherein in operation said PD-ICE achieves reduced pulsation and NVH, reduced exhaust size and weight, and improved fuel efficiency.