56 results about "Combustion analysis" patented technology

A method and apparatus that applies corrections to the mass flow rate of combustion air into a gas or oil-fired, forced-draft burner, and thus provides for correcting the air-fuel ratio, by directly measuring the combustion air temperature and / or the barometric pressure of the combustion air, and using these measurements to develop a fan speed drive signal that corrects the volume of air inlet to the burner system without the use of the complex and expensive fully metered control systems, or elaborate feedback systems, or systems that require real-time combustion analysis, and the like.

A traversable, fiber-optic probe design for flow-related measurements in a production-car IC engine during normal operating conditions may be fitted into an M8 spark-plug hole and traversed as much as 50 mm in an axial direction of the spark plug, allowing measurements inside the engine cylinder including the spark plug location. Components of the laser-based system include on-table optics used to generate laser beams and a data acquisition and reduction system used to extract the information measured from the signal produced by the fiber-optic probe.

This invention relates to an automatic system used in collecting and analyzing the combustion pressure data in the cylinder of a lower-middle speed engine connected by a pressure sensor, a Hall sensor, an upper dead point gear disk, a signal amplifier, a terminal board, a data collection card and a PC, in which, said system amplifies the pressure signal in the cylinder collected by the pressure sensor by a signal amplifier and cuts in it together with the signal of the upper dead point collected by the Hall sensor to the terminal board then collects the signals into the PC set by a high speed collecting card and the software of the data collection and combustion analyzing system mounted in the PC set displays the collected signal waveforms to compute curves of combustion heat discharge rate, heating volume and the temperature in the cylinder.

A traversable, fiber-optic probe design for flow-related measurements in a production-car IC engine during normal operating conditions may be fitted into an M8 spark-plug hole and traversed as much as 50 mm in an axial direction of the spark plug, allowing measurements inside the engine cylinder including the spark plug location. Components of the laser-based system include on-table optics used to generate laser beams and a data acquisition and reduction system used to extract the information measured from the signal produced by the fiber-optic probe.

The invention discloses a correcting method of the crank angle value of the combustion cylinder pressure testing curve of a reciprocating engine. In the shut-down state, the diesel engine 10 is moved to the theoretically top dead center position of an air cylinder to be measured through a jigger, thin sheet iron 6 is bonded onto a timing disk 11, a pulse sensor 7 is installed above the sheet iron 6, and the other end of the sensor 7 is connected into a combustion analysis meter 9. The diesel engine 10 is adjusted to be in the working condition in need of measurement, a fuel pump rack of the air cylinder to be measured is pulled up, and the curve generated by software in the combustion analysis meter 9 and a pulse signal of the pulse sensor at the moment are obtained. The angle value of the pulse signal is a, the angle position of the maximum cylinder pressure is b, the corrected crank angle value of the combustion cylinder pressure testing curve is -b+a, and therefore the position of the actual crank angle corresponding to the combustion cylinder pressure curve can be located accurately.

The invention provides a fuel injector needle valve displacement curve prediction method for a jerk fuel injection system. According to the motion characteristics of a fuel injector needle valve and the pressure fluctuation characteristics of a fuel pressure curve, the opening and closing phases of the needle valve are determined, and the delay of pressure waves is then calculated to obtain a displacement curve of the needle valve. A needle vale displacement sensor can be replaced, the problems of the displacement sensor, such as difficulty in installation and high cost, are solved, and the objectives of combustion analysis, fault diagnosis and feedback control carried out on an engine are achieved.

The invention discloses a cabin type diesel engine plateau low-temperature starting test device and method. A test chamber of the device is connected with a vacuum pump through a chamber penetrating pipeline, the test chamber is connected with a refrigerating unit II through a pipeline, and a refrigerating unit I is connected with a fan through a pipeline. An exhaust radiator is sequentially connected with an exhaust buffer tank, a vacuum pump and an oil-water separator; a diesel engine starting storage battery is connected with a diesel engine; an accelerator actuator is connected with an engine oil supply system and a control and data acquisition module; the two ends of a combustion analyzer are connected with engine exhaust and control and a data acquisition module respectively; an ECU and the data acquisition module are respectively connected with a display terminal; a fuel heater is connected with a fuel tank through an oil pipeline with an oil pump; and the exhaust is connected with a diesel engine exhaust pipe through a pipeline. The device and the method can be used to carry out diesel engine starting performance test and evaluation at different altitudes and different temperatures, and have the characteristics of short test period, good repeatability and the like.

The invention discloses a gasoline engine high-pressure oil pump driving cam phase measuring method and system and a storage medium. The method comprises the following steps: measuring the rotating angle of an engine crankshaft through an angle marker, measuring the cam lift through a displacement sensor, and outputting a cam lift signal; measuring the pressure in an engine cylinder through a cylinder pressure sensor and outputting a cylinder pressure signal; acquiring a compression top dead center position of a cylinder piston of the engine through a cylinder pressure sensor, and defining thetop dead center position as 0 degree; making a cam lift signal and a cylinder pressure signal connected into a lower computer combustion analyzer and uploaded to an upper computer, measuring the angle position of the top dead center of the oil pump cam through the upper computer and realizing measurement of the phase of the oil pump cam. Compared with the prior art, existing resources are effectively utilized, the phase measurement precision of the gasoline engine high-pressure oil pump driving cam is improved, the labor intensity is reduced, the test time is shortened, and the working efficiency is improved.

The invention relates to a secondary air closed-loop optimization control system based on an air register resistance coefficient. The secondary air closed-loop optimization control system comprises a secondary air precise control module used for building a mapping relation between the secondary air register opening degree and the air volume of each layer, a boiler combustion analysis module used for obtaining a characteristic value of a boiler combustion boundary and a characteristic value of a combustion effect, an intelligent modeling module used for establishing a neural network model between the characteristic value of the boiler combustion boundary and the characteristic value of the combustion effect, an optimization module used for obtaining an optimal solution through an optimization algorithm based on the established neural network model, and a closed-loop control module used for acquiring parameters in real time, inversely calculating the optimal value of the boiler secondary air register opening degree after the parameters are processed by the boiler combustion analysis module and the optimization module, and executing closed-loop control in a DCS. The secondary air closed-loop optimization control system can conduct dynamic real-time optimization to adapt to the change of the load, coal quality and operation mode of a power station boiler, and can greatly improve the automation level of the boiler, effectively improve the efficiency of the boiler and reduce the NOx emission concentration of a hearth outlet.

The invention discloses a crankshaft corner mark signal acquisition system suitable for 165-series engine combustion analysis. In the crankshaft corner mark signal acquisition system, the upper end ofa torsional vibration transmission arm is connected with the free end of a crankshaft; a laser fluted disc is installed at the lower end of the torsional vibration transmission arm; a fluted disc pressing flange is pressed on the laser fluted disc; a laser sensor installing and adjusting device comprises a laser sensor correcting supporting frame and an installing structure with a self-tighteningoil seal; the installing structure with the self-tightening oil seal is connected with the torsional vibration transmission arm in a sleeving fitting mode; a laser sensor is installed on a sliding bracket; and a fixing supporting frame is fixed to a disk of the installing structure with the self-tightening oil seal, and the sliding bracket is fixed to the fixing supporting frame. The crankshaft corner mark signal acquisition system suitable for the 165-series engine combustion analysis is steady in structure and easy to install and operate, is widely applied to the combustion indicator diagram measurement and the torsional vibration test of a 165-series engine, and has high measurement accuracy and good use stability.

The invention discloses a method for obtaining the best advance angle of ignition of a coke-oven gas engine. A common advance angle of ignition optimization method, MBT, fails to take emission performance into account and leads to emission of nitrogen oxides exceeding the standard seriously when applied to the coke-oven gas engine. According to the method, the coke-oven gas engine improved by a gasoline engine is adopted, and with combination of a dynamometer, an emission analyzer and a combustion analyzer, influence rules on engine power performance and emission characteristics by the advanceangle of ignition under different working conditions are researched, algorithm of advance angle of ignition optimization is adopted based on the influence rules to establish a single objective solution model and calculate the best advance angle of ignition under different working conditions. The obtained best advance angle of ignition can be written in ignition MAP of ECU to be used for actual control of the coke-oven gas engine.