An example engine control system may include an oxygen intake sensor; a fuel delivery device to control a rate of fuel delivery to the engine combustor; a combustor pressure sensor; a combustor temperature sensor; and a controller to receive at least one of an oxygen intake signal, a combustor pressure signal, and a combustor temperature signal; determine at least one of a reference specific fuel consumption (SFC) of the engine or a reference amount of a respective exhaust gas of a plurality of exhaust gases based on the oxygen signal, the pressure signal, and the temperature signal; compare at least one of the reference SFC or the reference amount of a respective exhaust gas to a respective threshold value; and control the fuel delivery device to control the rate of fuel delivery based on the comparison.

Methods of operation of liquid and gaseous multi-fuel compression ignition engines that may be operated on a gaseous fuel or a liquid fuel, or a combination of both a gaseous fuel and a liquid fuel at the same time and in some embodiments, in the same combustion event. Various embodiments are disclosed.

Methods of operation of liquid and gaseous multi-fuel compression ignition engines that may be operated on a gaseous fuel or a liquid fuel, or a combination of both a gaseous fuel and a liquid fuel at the same time and in some embodiments, in the same combustion event. Various embodiments are disclosed.

Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be arranged opposed to each other or in a way that fuel spray from one injector intersects and collides with fuel spray from the other injector.

Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be arranged opposed to each other or in a way that fuel spray from one injector intersects and collides with fuel spray from the other injector.

Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be operated to provide pilot, main, and post combustion fuel injections during a cycle of a cylinder.

Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be operated to provide pilot, main, and post combustion fuel injections during a cycle of a cylinder.

A method is provided for operating a compression-ignition engine having a combustion chamber. The method includes establishing, via an injection driver, electronic communication with a primary clock configured to generate a primary time signal. The method also includes commanding an injector to introduce into the combustion chamber injections of fuel having respective pulse widths timed using the primary time signal to generate combustion within the combustion chamber. The method additionally includes detecting a loss of the primary time signal and subsequently establishing an electronic communication between the injection driver and an auxiliary clock configured to generate an auxiliary time signal. Furthermore, the method includes commanding the injector to introduce into the combustion chamber a number of injections of fuel having respective pulse widths timed using the auxiliary time signal and thereby continuing combustion within the combustion chamber. A vehicle employing the injection driver for executing the method is also provided.

A compression-ignition, opposed-piston engine using a low reactivity fuel as an ignition medium manages trapped temperature and trapped combustion residue within, and fuel injection into, the combustion chambers of the engine, and controls the compression ratio of the engine in order to realize reductions in emissions as well as improved fuel consumption efficiencies.

A compression-ignition, opposed-piston engine using a low reactivity fuel as an ignition medium manages trapped temperature and trapped combustion residue within, and fuel injection into, the combustion chambers of the engine, and controls the compression ratio of the engine in order to realize reductions in emissions as well as improved fuel consumption efficiencies.