A pressure control valve system includes a pressure control valve, an electric actuator, an upstream pressure sensor, a downstream pressure sensor, and a controller. The electric actuator adjustably opens and closes the pressure control valve. The upstream pressure sensor measures pressure upstream of the pressure control valve and outputs a plurality of sequential upstream pressure signals over a plurality of successive periods in time. The downstream pressure sensor measures pressure downstream of the pressure control valve and outputs a plurality of sequential downstream pressure signals over the plurality of successive periods in time. The a controller receives the upstream and downstream pressure signals and outputs a plurality of sequential command signals to the electric actuator. Each sequential command signal is based on a respective one of the plurality of sequential downstream and upstream pressure signals for a respective one of the plurality of successive periods in time.

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.

A liquefied gas fuel feeding system can include a liquefied gas container configured to store liquefied gas and gaseous gas in cryogenic circumstances, a first fuel passage opening into an ullage space of the gas, a second fuel passage opening into a bottom section of the gas and provided with a controllable pump, at least two fuel delivery passages each configured to convey gas to a single gas consumer of at least two gas consumers, and a valve assembly configured to connect alternatively the first fuel passage or the second fuel passage to each one of the at least two fuel delivery passages.

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.

Control of an internal combustion engine system in response to a condensation condition associated with a charge air cooler is disclosed. One or more operating parameters of the internal combustion engine are monitored to the control charge air cooler coolant inlet temperature to keep the charge temperature above the estimated dew point to reduce or prevent condensation upstream of the intake manifold.

The present invention relates to a method, system, vehicle, and computer program product for determining time data relating to a non-combustion outlet process of a fuel gas from a gas tank associated with a vehicle. The method comprises providing a model for the state of fuel gas in the gas tank. The method further comprises determining time data relating to the outlet process of the fuel gas based on the model.

Provided is a fuel pressure monitoring system of a vaporizer using a safety module which issues a fault signal by detecting a pressure using a fuel pressure sensor disposed in a pressure regulating chamber of the vaporizer within a predetermined time after an engine is stopped and determining that the pressure regulating mechanism fails when the detected pressure exceeds a threshold stored in a storage device to be increased to a predetermined pressure or higher, and the pressure regulating mechanism is determined to fail only when a water temperature of cooling water in the engine of the vaporizer reaches a predetermined temperature at which warming up of the engine can be determined to be completed.

Systems and methods for thermal management of a direct injection propane fuel system are disclosed that include control a temperature of the fuel tank at or below a desired operating temperature to avoid venting of fuel to atmosphere.

A method for measuring pressure of a gaseous fuel compressed in a feed system of an engine equipping a motor vehicle, by a pressure measuring device having an infrared quality sensor and an electronic control unit, the measuring method being characterized in that it consists in determining a corrected absorbance value of the fuel based on absorbance measurements performed by infrared analysis, at preset wavelengths, and in comparing the value to a nominal absorbance value, determined beforehand based on absorbance measurements performed at a nominal pressure after a pressure stabilization phase of the fuel and at the same said wavelengths, in order to determine the fuel pressure.

A system for determining properties of fuel supplied to an internal combustion (IC) engine and for adjusting operations of the IC engine based on the determined properties. The system includes an air-flow throttle configured to control the air supplied to the IC engine; a fuel-flow throttle configured to control the fuel supplied to the IC engine; and an engine control module (ECM) configured to receive readings from and control operation of the throttles. The ECM is configured to perform a fuel-air determination program where the ECM determines a percent-error air-to-fuel ratio (AF) based on a true AF ratio compared to an ideal AF ratio. The ECM is configured to perform a fuel property determination and adjustment program in which the ECM is configured to adjust operations of the IC engine based on a fuel property value determined using the percent-error AF ratio.