A method of operating a forced induction gaseous-fueled engine includes mixing gaseous-fuel and engine intake air to form a mixture at a fuel mixer. The method includes delivering the mixture to an intake manifold by at least partially bypassing a charge air cooler.

Embodiments of a gaseous or dual fuel electronic pressure regulation system (EPRS) for a multipoint fuel injection engine are described herein. Additionally, embodiments of a method for controlling the EPRS are provided. In particular, the EPRS employs an electronic pressure regulator (EPR) capable of accurately determining and controlling the mass flow of gaseous fuel into a fuel rail so as to avoid pressure droop and over- and under-pressurization of the gas admission valves (GAVs). By using the EPRS described above, mass flow is able to be distributed to the downstream manifold or engine cylinders very accurately, and the GAVs are able to be driven simultaneously in a pressure/pulse duration that is optimal for accurate and repeatable operation.

Methods for controlling an air-to-fuel (AFR) ratio in the metering of fuel to an operating internal combustion engine (ICE) are provided using software-implemented logic controls to enable the determination of one or more of a maximum-power AFR fiducial and a maximum-efficiency AFR fiducial. Control of the fuel delivered to achieve any desired AFT using the fiducial values and/or a known or derived power-AFR curve for the ICE, and pressures of 5 psi or less, without chemical or temperature sensing of the exhaust gas of the ICE.

The invention relates to a device and a method for ascertaining an injection time and/or an amount of a liquefied gas fuelsuch as liquefied petroleum gas (LPG), natural gas (CNG), liquefied natural gas (LNG), biogas or hydrogen (H.sub.2)to be delivered to a cylinder of an engine (19) in order to operate the engine (19) in a bivalent or trivalent fuel operating mode, said device being designed in such a way that the ascertained injection time of the liquefied gas fuel is dependent on an ascertained calorific power or an ascertained gas mixture characteristic. A gas mixture analysis module (7) is used for optimizing combustion. A gas start mechanism allows a vehicle to be started on gas power even at low temperatures.

An engine includes an intake, an air-fuel path coupled to the intake, an accumulator configured coupled to the air-fuel path and configured to store an air-fuel mixture, and at least one valve configured to selectively provide the air-fuel mixture from the engine to the accumulator at a first time and store the air-fuel mixture within the accumulator at a second time. A controller may be configured to provide commands to the at least one valve. The plurality of commands may include an open command to release air and fuel mixture from the accumulator and a close command to store air and fuel mixture in the accumulator.

Systems and methods for automatic calibration of large industrial engines in applications where the quality of the fuel supply is unknown and/or variable over time, particularly engines that drive compressors on a natural gas well site. A combination of throttles and an oxygen sensor including a mass-flow-air throttle and a mass-flow-gas throttle to determine the mass flow of air and mass flow of gas. As a response to exhaust gas oxygen level readings, the mass flow measurements are used to determine real time air-fuel ratios. An algorithm uses the air-fuel ratios as input data, wherein a microcontroller adjusts the throttles to meet engine performance demands. Additionally, using the air-fuel ratio data and suggested engine OEM calibration specifications as block multiplier inputs, particular fuel properties, such as British Thermal Unit (BTU) content, can be accurately interpolated, thereby enabling automatic calibration of the engine.

A method of operating a forced induction gaseous-fueled engine includes mixing gaseous-fuel and engine intake air to form a mixture at a fuel mixer. The method includes delivering the mixture to an intake manifold by at least partially bypassing a charge air cooler.

A mass-flow throttle for highly accurate control of the gaseous supplies (fuel and/or air) to the combustion chambers for a large engine in response to instantaneous demand signals from the engine's ECM, especially for large (i.e., 30 liters or greater in size) spark-ignited internal combustion engines fueled by natural gas. With a unitary block assembly and a throttle blade driven by a non-articulated rotary actuator shaft, in combination with tight control circuitry including multiple pressure sensors as well as sensors for temperature and throttle position, the same basic throttle concepts are innovatively suited to be used for both MFG and MFA throttles in industrial applications, to achieve highly accurate mass-flow control even despite pressure fluctuations while operating in non-choked flow.

A fluid pressure regulation and conditioning module comprises a metal manifold including a fluid flow path between fluid inlet outlets, a pressure regulator assembled to the metal manifold and disposed along the fluid flow path for regulating the pressure of the fluid exiting the module, and a filter assembly. The metal manifold further includes, for heating of the metal manifold with an externally supplied heat exchange media, a heat exchange media flow path extending between heat exchange media inlet and outlet. The filter assembly includes a metal filter housing and a filter element contained within the metal filter housing, the metal filter housing being in direct thermal contact with the metal manifold whereby heat from the metal manifold can flow to the metal filter housing for heating of the fluid not only in the metal manifold but also within the metal filter housing.

Nonwoven abrasive articles comprise a nonwoven abrasive member having an overlayer composition comprising a fatty acid metal salt disposed thereon adjacent to a working surface. The nonwoven abrasive member comprises abrasive particles adhered to a fiber web by a binder. The abrasive particles may be exposed and/or the nonwoven abrasive member may have suitable frictional properties. Methods of making the same are also disclosed.