A controller may obtain data indicative of heat release in a cylinder of an engine. The controller may determine that the data indicative of the heat release in the cylinder is indicative of clogging of one or more ducts of a duct structure of the engine. The controller may perform an operation to reduce the clogging of the one or more ducts based on the data indicative of the heat release in the cylinder being indicative of the clogging of the one or more ducts. The operation may include at least one of causing a pressure of fuel that is supplied to a fuel injector to increase or causing a peak temperature in the cylinder to increase.

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a high-pressure pump having a pump element, a regulating device positioned upstream of the high-pressure pump, a fuel channel defined between an inflow side of the regulating device and the pump element, and a safety device, actuatable to reduce a through-flowable cross section of the fuel channel.

An internal combustion engine including a pilot subchamber, a pilot fuel injector having a tip in communication with the pilot subchamber, an ignition element positioned to ignite fuel within the pilot subchamber, and a main fuel injector spaced apart from the pilot fuel injector. The engine includes a common rail in fluid communication with the main fuel injector and with the pilot fuel injector. The internal combustion engine may be a reciprocating engine. A method of combusting fuel in an internal combustion engine is also provided.

A system for controlling an engine based on piston temperature deviation includes a piston temperature estimation module that estimates a piston temperature based on engine operating conditions, a piston temperature deviation estimation module that estimates a deviation of the estimated piston temperature from a steady-state piston temperature, and an engine control module that determines an engine control parameter based upon the estimated piston temperature deviation.

A method for controlling a high-pressure pump for the injection of fuel into a combustion engine, the high-pressure pump being connected to a camshaft of the combustion engine, wherein the high-pressure pump is controlled in a camshaft-synchronous manner by ascertaining an angular offset between the flank positions of a camshaft pulse-generating wheel and a predefinable point above the bottom dead center of a cam of the high-pressure pump on the camshaft.

Presented herein is an energy conversion module containing an internal combustion engine, air compressor, fuel delivery system, waste energy collection system and emission control system. Energy input is controlled via a feedback loop containing an air compressor, carburetor and post-combustion oxygen sensor. Emissions are controlled via the use of a high-efficiency catalytic converter and exhaust gas recirculation system via a feedback from post-catalytic oxygen sensors. Waste heat energy is also collected from both the combustion and catalytic processes via a series of heat exchangers and a high-heat capacity medium.

An internal combustion engine includes a port injector that injects fuel into an intake port and a direct injection injector that injects fuel directly into a combustion chamber. When the internal combustion engine is in a low load condition while requiring fuel injection, a controller stops fuel injection through the port injector so that an entire required fuel injection amount is injected through the direct injection injector. As a result of this processing, the fuel pressure of the direct injection injector is reduced quickly in the low load condition.

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

A method for calibrating a fuel pump for use in a fuel supply system of a device having internal combustion engine includes determining a tolerance-conditioned and wear-conditioned deviation of the fuel pump with respect to its delivery behavior so that the calibration permits energy-consumption-optimized actuation of the fuel pump.

Provided is a pre-chamber type diesel engine wherein the fuel system is not complicated, regardless of whether a regeneration function is provided. An injector is employed, which is able to inject fuel at a given timing by means of an electrical signal from a controller, and when a prescribed amount of particles have been trapped in a particle collection filter the injector carries out an additional fuel injection during the expansion stroke of a piston.