8 results about "Pilot injection" patented technology

The invention discloses an idling fuel consumption optimization control method and system for a commercial diesel vehicle, and relates to the technical field of whole vehicle systems.The method comprises the steps that the target idling rotating speed and the allowable rotating speed deviation range are set, the vehicle runs in the idling test state without additional loads, and the actual rotating speed of an engine is kept within the deviation range in the parameter adjusting process; the main injection oil injection timing, the pilot injection oil injection timing and the pilot injection oil quantity are sequentially adjusted based on oil consumption evaluation, and a calibration parameter combination covering the target rotating speed range is formed by recording oil consumption data of all adjustment points and gradually optimizing parameters; and finally, all target rotating speed parameters are rechecked, and the idling operation stability and the oil consumption optimization effect are ensured. By systematically adjusting each fuel injection parameter and keeping the rotating speed stable, the problem that the fuel consumption evaluation is inaccurate due to the fact that a single-point data and fixed sequence mode is mostly adopted in traditional idling fuel consumption calibration and a parameter coupling relation cannot be fully reflected is solved, and idling fuel consumption optimization and stability synchronous improvement are achieved.

The application provides a kind of ignition system of methanol lean engine, vehicle, the system includes ignition device and control system;Ignition device includes main combustion chamber and prechamber, main combustion chamber is configured with the air inlet into chamber and the main injector of injection methanol;Prechamber is provided with pilot injection injector, multi-electrode spark plug, and with the multiple injection holes of main combustion chamber communication;Control system is configured to monitor the engine speed, air intake and environmental parameters in real time, to control the injection pressure, injection amount, injection time of main combustion fuel and pilot fuel, and ignition time, to realize stable ignition under different working condition parameters and control the air-fuel ratio under each working condition. By optimizing the ignition system, the engine can be stably ignited and efficiently combusted under different environmental conditions, thereby further improving the economic performance of the methanol lean engine based on stable ignition.

This invention discloses a forced cooling housing for a micro-injection ignition injector in the field of fuel injector technology. The housing includes a housing fixedly fitted onto the outside of the injector body, extending towards the injection end of the injector body and covering the root of the micro-orifice nozzle. Inside the housing are: multiple circumferentially evenly distributed inner cooling channels adapted to the shape of the injector body; multiple injection chambers corresponding one-to-one with the inner cooling channels and located at the liquid outlet of the corresponding inner cooling channels; a nozzle cooling ring channel surrounding the outer periphery of the micro-orifice nozzle and adapted to the shape of the micro-orifice nozzle; and an outer cooling ring channel coaxially located radially outside the inner cooling channels. The injection chambers connect the corresponding inner cooling channels and the nozzle cooling ring channel. This cooling housing, by providing multiple circumferentially distributed injection chambers within the housing, combined with the mechanical drive of the injection assembly, transforms the traditional continuous cooling mode into pulsed directional injection, significantly improving heat exchange efficiency.

The main fuel ignites reliably and stably, and misfires are suppressed even after ignition. [Solution] Used in a dual-fuel engine for ships that uses two types of fuel, each unit of a plurality of cylinder units has a main fuel injection pump, a pilot fuel injection pump, a first switching means for selectively switching the pilot injection to a range of a first injection amount on the fuel reduction side or a range of a second injection amount on the fuel increase side, and a second switching means for selectively stopping the main injection or switching it to a range of a predetermined injection amount. When the engine is started, the first switching means is switched so that the pilot injection is within the range of the second injection amount, and the second switching means is switched so that the main injection is stopped. After a clutch engagement command, the first switching means is switched so that the pilot injection is within the range of the first injection amount, and the second switching means is switched so that the main injection is within the range of a predetermined injection amount. When the main fuel injection pump starts fuel injection, the injection of the main fuel is restricted.

A method of cranking a fixed speed engine (40) is provided, the method comprising the steps of: a) providing an engine start command; b) enabling one or more cylinders (42) of the fixed speed engine; and c) enabling a pilot injection mode during cranking of the engine, wherein in the pilot injection mode each cylinder cycle of the one or more enabled cylinders includes one or more pilot injections followed by a main injection.

Dual-fuel internal combustion engine (11), with cylinders (12) in which a first liquid fuel can be combusted in a first operating mode and a second liquid fuel can be combusted in a second operating mode, with a main injection system having at least one main injector (16) per cylinder (12), through which the first liquid fuel, which is relatively ignitable, can be supplied to the cylinders (12) in the first operating mode, and through which the second liquid fuel, which is relatively inignitable, can be supplied to the cylinders (12) in the second operating mode, with a pilot injection system having at least one pilot injector (23) per cylinder (12), via which, in the second operating mode, the first liquid fuel can be supplied to the cylinders (12) of the internal combustion engine for the ignition of the second liquid fuel, wherein the main injection system and the pilot injection system are coupled in such a way that in the second operating mode, starting from the pilot injection system, the first liquid fuel can be supplied to the respective main injector (16) of the main injection system as working fluid and / or as barrier fluid.

The application belongs to the technical field of inter-stage combustion chamber design of an aero-engine, and particularly relates to an aero-engine hydrogen-fueled inter-stage combustion chamber, which comprises a combustion chamber outer wall in the shape of a ring, a combustion chamber inner wall in the shape of a ring arranged in the combustion chamber outer wall, a plurality of guide vanes supported between the combustion chamber outer wall and the combustion chamber inner wall in a circumferential direction, each guide vane being hollow, the leeward side wall of each guide vane being provided with a row of leeward side injection holes distributed along the height of the guide vane, the windward side wall of each guide vane being provided with a row of windward side injection holes distributed along the height of the guide vane, and each guide vane being provided with a row of pilot injection holes distributed along the height of the guide vane and a pilot slot extending along the height of the guide vane, the pilot slot being located behind the windward side injection holes and being connected to the pilot injection holes, a plurality of hydrogen gas injection rods connected to a hydrogen gas source and penetrating through the combustion chamber outer wall and being inserted into each guide vane, and each hydrogen gas injection rod being provided with three rows of hydrogen gas nozzles on the side wall of the hydrogen gas injection rod and being inserted into the leeward side injection holes, the windward side injection holes and the pilot injection holes of the corresponding guide vane.

The invention discloses a multi-fuel generator set control system, a control method thereof and a generator set, which are applied to the technical field of generator sets, the multi-fuel generator set control system comprises a multi-fuel generator set and a control system, the control system comprises a fuel change-over switch, an engine starting switch, a carburetor, a fuel gas supply electric control valve, a signal detection module, an ignition device and a control device; a gas fuel supply pipeline of the multi-fuel engine is connected with a gas inlet of the gas supply electric control valve, and a gas outlet of the gas supply electric control valve is connected with a gas fuel inlet of the carburetor. And the signal input end of the fuel type detection circuit is connected with the fuel change-over switch. The temperature sensor is used for detecting a cylinder body temperature signal of the fuel engine so as to control the pilot injection opening time of the fuel gas supply electric control valve according to the cylinder body temperature signal of the engine and a fuel type signal. According to the method, pilot injection enrichment can be started based on the cylinder body temperature signal, extra redundant steps are not needed, one-time starting is achieved, and the flexibility of air supply is greatly improved.