The present invention relates to a gas tank arrangement (100) for an internal combustion engine (102), said gas tank arrangement (100) comprising a gas tank (104) for containing a combustible gas, and an additional gas tank (106) arranged in upstream fluid communication with said internal combustion engine (102), wherein the gas tank arrangement (100) further comprises a valve arrangement (108) positioned in fluid communication with the internal combustion engine (102), wherein the valve arrangement (108) is further arranged in upstream fluid communication with the gas tank (104) and the additional gas tank (106) for controllably direct combustible gas from the internal combustion engine (102) to either the gas tank (104) or the additional gas tank (106).

Methods and systems are provided for an engine to infer fuel temperature from a measured rate of change in a pressure of a fuel passage between a low pressure fuel pump and a high pressure fuel pump during certain operating conditions, including when the low pressure fuel pump is switched off. The operation of the low pressure fuel pump may be adjusted responsively to a change in the inferred fuel temperature.

A vehicle drive system is disclosed comprising an internal combustion engine for driving a vehicle, wherein the internal combustion engine comprises a combustion chamber with injectors for injecting diesel into the combustion chamber, a supply line for delivering a gas mixture to the combustion chamber, an electrolysis chamber for producing hydrogen gas and oxygen gas, and a vacuum pump for sucking the hydrogen gas and the oxygen gas from the electrolysis chamber. The vehicle drive system furthermore comprises a gasification tank with volatile organic compounds received therein, in particular methanol or ethanol, as well as a supply line for supplying a gas mixture to the combustion chamber, wherein the gas mixture comprises gasified organic compounds from the gasification tank and at least a part of the hydrogen gas and the oxygen gas. Furthermore a corresponding method for operation a vehicle drive system is disclosed.

Various implementations include drive systems and related methods of operation. In one implementation, a drive system includes: a combustion engine, where the combustion engine includes a combustion chamber with injectors for injecting a fossil fuel into the combustion chamber, a supply line for delivering a gas mixture to the combustion chamber, an electrolysis chamber for producing hydrogen gas and oxygen gas, and a vacuum pump for sucking the hydrogen gas and the oxygen gas from the electrolysis chamber, a gasification tank with volatile organic compounds received therein, and an air compressor for pumping air into the gasification tank, wherein the gas mixture comprises gasified organic compounds from the gasification tank and at least a part of the hydrogen gas and the oxygen gas.

A mechanical fuel pump is disclosed for delivering fuel to an engine of a vehicle, the mechanical fuel pump having an activated configuration and a deactivated configuration. A dual fuel system and method are also disclosed for use with the mechanical fuel pump.

A dual-fuel fuel injection system for an internal combustion engine has a liquid fuel injection branch and a gas fuel injection branch, in which a gas injector assembly that is controllable via a control fluid is situated. The liquid fuel forms the control fluid of the gas injector assembly.

Methods and systems are providing for improving zero flow lubrication (ZFL) of a high pressure fuel pump coupled to direct fuel injectors via a direct injection fuel rail. A ZFL transfer function for the fuel pump is learned while fuel is at non-nominal fuel bulk modulus conditions and corrected for variations from a nominal fuel bulk modulus estimate. When zero flow lubrication of the pump is requested, the pump is operated with a duty cycle based on the learned transfer function and an instantaneous estimate of the fuel bulk modulus to compensate for differences in fuel condition from the nominal fuel bulk modulus estimate.

An alternative fueling system configured to consume alternative fuels by renewable identification number (RIN) assignment to enforce neat consumption; or moreover and more specifically, to utilize that RIN assignment whenever neat consumption is possible, thereby lessening usage constraints upon the remaining stock(s) of renewable fuel as an example, and/or to provide purging of the alternative fuel from the engine on shutdown.

A multi-fuel rail apparatus for an internal combustion engine communicates fuel from 10 a first fuel source and a second fuel source to a plurality of fuel injectors. Each fuel injector receives fuel from the multi-fuel rail apparatus through a branch connection for each fuel. The multi fuel rail apparatus has a first elongate member including a first longitudinal bore spaced apart from a second longitudinal bore and first and second fuel inlets for fluidly communicating first and second fuels into the first and 15 second longitudinal bores respectively. There is a branch connecting structure for each fuel injector along the first elongate member for fluidly connecting the first and second longitudinal bores with respective branch connections from respective fuel injectors.

A vehicle drive system is disclosed comprising an internal combustion engine for driving a vehicle, wherein the internal combustion engine comprises a combustion chamber with injectors for injecting diesel into the combustion chamber, a supply line for delivering a gas mixture to the combustion chamber, an electrolysis chamber for producing hydrogen gas and oxygen gas, and a vacuum pump for sucking the hydrogen gas and the oxygen gas from the electrolysis chamber. The vehicle drive system furthermore comprises a gasification tank with volatile organic compounds received therein, in particular methanol or ethanol, as well as a supply line for supplying a gas mixture to the combustion chamber, wherein the gas mixture comprises gasified organic compounds from the gasification tank and at least a part of the hydrogen gas and the oxygen gas. Furthermore a corresponding method for operation a vehicle drive system is disclosed.