公开(公告)号：US20180100449A1

公开(公告)日：2018-04-12

申请号：US15565034

申请日：2016-04-07

Applicant: WESTPORT POWER INC.

Inventor： Alan B. WELCH ,  Colin W. BLAIR ,  Hamed KARIMI SHARIF

IPC: F02D19/02 ,  F02D41/00 ,  F02D41/22

CPC classification number: F02D19/024 ,  F02D19/026 ,  F02D19/027 ,  F02D19/0642 ,  F02D41/0027 ,  F02D41/221 ,  F02D41/2467 ,  F02D41/3005 ,  F02D2041/225 ,  F02D2200/0614 ,  F02M21/0254 ,  F02M21/0275 ,  Y02T10/32 ,  Y02T10/36

Abstract: Fuel injection accuracy of gaseous fuel injectors is important for efficient engine operation. However, the performance of the injectors varies from part to part and across their lifetime, and when an injector is under performing according to its specification it is often unknown what is causing the problem. An apparatus for operating a gaseous fuel injector in an engine comprises a mass flow sensor that generates a signal representative of the mass flow rate of the gaseous fuel in a supply conduit in the engine. A controller connected with the injector and the mass flow sensor is programmed to actuate the injector to introduce gaseous fuel into the engine; determine the actual mass flow rate of the gaseous fuel based on the signal representative of the mass flow rate; calculate a difference between the actual mass flow rate and a desired mass flow rate; and adjust at least one of on-time of the gaseous fuel injector and a magnitude of an injector activation signal by respective amounts based on the difference when the absolute value of the difference is greater than a predetermined value.

公开(公告)号：US20190032618A1

公开(公告)日：2019-01-31

申请号：US15754944

申请日：2016-08-26

Applicant: Westport Power Inc.

Inventor： Dominique J. SOLERI ,  Patric OUELLETTE ,  Hamed KARIMI SHARIF

IPC: F02M65/00 ,  F02M53/04 ,  F02D17/02 ,  F02M25/14 ,  B08B5/02 ,  B08B17/06 ,  F02D41/00 ,  F02D41/40 ,  F02M21/02 ,  F02D41/22 ,  F02M43/04

CPC classification number: F02M65/008 ,  B08B5/02 ,  B08B17/06 ,  B08B2203/027 ,  F02B77/04 ,  F02D17/02 ,  F02D19/0605 ,  F02D19/0623 ,  F02D19/0647 ,  F02D19/0689 ,  F02D19/0694 ,  F02D19/081 ,  F02D41/0025 ,  F02D41/0027 ,  F02D41/008 ,  F02D41/22 ,  F02D41/401 ,  F02D2041/389 ,  F02D2200/06 ,  F02M21/0248 ,  F02M21/0263 ,  F02M21/0275 ,  F02M21/0293 ,  F02M25/14 ,  F02M43/04 ,  F02M53/043 ,  F02M2200/06 ,  F02M2200/46 ,  Y02T10/32 ,  Y02T10/36 ,  Y02T10/44

Abstract: A method for deposit mitigation in a gaseous fuel injector that introduces a gaseous fuel through a gaseous fuel orifice directly into a combustion chamber of an internal combustion engine includes at least one of a) reducing the ago length of the gaseous fuel orifice by substantially between 10% to 50% of a previous length of a previous gaseous fuel orifice showing deposit accumulation above a predetermined threshold; b) providing the gaseous fuel orifice with an inwardly and substantially linearly tapering profile; c) determining deposit mitigation is needed; and performing at least one of the following deposit mitigation techniques i) increasing gaseous fuel injection pressure wherein deposit accumulation is reduced during fuel injection; and ii) decreasing gaseous fuel temperature wherein a rate of deposit accumulation is reduced; and d) injecting compressed air through the gaseous fuel orifice during shutdown of the internal combustion engine; whereby torque loss in the internal combustion engine due to deposit accumulation in the gaseous fuel orifice is reduced below a predetermined value.