129results about How to "Reduce combustion noise" patented technology

An engine system and a method of controlling a combustion process in an internal combustion engine are disclosed. The combustion process is based on compression ignition of a stratified air-fuel mixture using a high octane fuel such as gasoline. Multiple fuel injections may be used in a given combustion cycle. Fuel injection timing, EGR, exhaust rebreathing, late intake valve closing, and intake boost are controlled to enable autoignition over essentially the entire speed and load operating range of the engine, while providing reduced emissions, low noise, and low fuel consumption.

The invention is a high-efficiency, energy-saving and high-speed burner for a gas cooker used in catering industry and includes a burner, a pre-heater, a pre-mixing small fire burner, a fireproof fire ring, an electronic ignition system and a regulating device. After being necked down, the burning flame is ejected with high speed rotation to form the rotary rapid ejection burning flame, thereby realizing sufficient burning, facilitating boiler heating, and increasing the heating speed with low burning noise and high heat efficiency. The high-efficiency, energy-saving and high-speed burner for the gas cooker has the advantages of simple manufacture, easy maintenance, sufficient burning, high flame temperature, convenient boiler heating, improved heating speed, low power of the equipped blower fan, low burning noise, high thermal efficiency, convenient regulation, full-automatic ignition, concentrative firepower, intensive fire, energy conservation, strong adaptability, capability of meeting different requirements, wide application, easy processing, low manufacture cost and suitability for mass production.

A control system of a compression-ignition engine is provided, which includes an engine configured to cause combustion of a mixture gas inside the combustion chamber, an injector attached to the engine and configured to inject fuel into the combustion chamber, a spark plug disposed to be oriented into the combustion chamber and configured to ignite the mixture gas inside the combustion chamber, and a controller connected to the injector and the spark plug and configured to operate the engine by outputting a control signal to the injector and the spark plug, respectively. After the spark plug ignites the mixture gas to start combustion, unburned mixture gas combusts by self-ignition. The controller outputs the control signal to the injector so that a fuel injection timing is advanced when the engine operates at a high speed than at a low speed.

A geometric compression ratio in an engine main body 1 is set to 15 or less. Injection control means (ECU 40) performs a main injection of injecting fuel near a compression top dead center, and a preceding injection prior to the main injection at a specific region of predetermined load within an operating region on a relatively low-speed side. The injection control means performs, as the preceding injection, a pilot injection of performing injection at a timing such that at least part of a fuel spray reaches outside a cavity 31 on a top face of a piston, and a pre-injection of injecting fuel at a predetermined timing after the pilot injection, to suppress thereby ignition of the fuel injected by the pilot injection and shorten an ignition delay of the fuel injected by the main injection.

A boosted engine is provided, which includes an engine body formed with a combustion chamber, a spark plug, a fuel injection valve, a booster, a boost controller, and a control unit including an operating range determining module and a compression end temperature estimating module. In a high load range, the fuel injection valve and the spark plug are controlled so that a mixture gas inside the combustion chamber starts combustion through flame propagation by ignition of the spark plug, and unburned mixture gas then combusts by compression ignition, and the boost controller is controlled to bring the booster into a boosting state. When a gas temperature inside the combustion chamber exceeds a given temperature at CTDC, the fuel injection valve is controlled so that a fuel injection end timing occurs on a compression stroke, and the spark plug is controlled so that the mixture gas is ignited after CTDC.

Systems and methods for detecting and controlling knock in an engine are presented. In one example, engine knock sensors are selected based on whether or not certain cylinders are activated and combusting air and fuel or deactivated and not combusting air and fuel. Output of selected knock sensors is the basis for adjusting engine spark timing.

The invention relates to an internal-combustion engine with piston reciprocating, comprising body, cover, piston, crankshaft and connecting bar. The piston moves advance and return and is connected with crankshaft through connecting bar. The space on the top of piston sealed by cover is formed blast chamber. Intake valve, air outlet valve and spark plug are set in cover at the top of blast chamber. In said body except blast chamber air compressed unit is set, which comprises inhalation valve, air outlet valve, assistant piston, which can move advance and return, and be connected with said crank shaft through assistant connecting bare, and assistant connecting bar. The outlet of air outlet valve is connected to hollow air conversation room withstanding pressure, in which thermal converter, temperature sensor, fuel nozzle and fuel evaporating and mixing room. The outlet of air conversation room is connected to said inlet of intake valve in blast chamber. The invention can decrease harmful gas NOx released largely because of low temperature, improve work efficiency of gas and decrease burning noise.

The invention relates to a combustion engine combination cycle power plant with low heat value, a co-production of the combustion engine combination cycle thermal power plant, an integrated coal gasification cycle combination (IGCC) power plant, and the like. The invention adopts the new technique of gas turbine combined cycle power generating that the high and intermediate heat value gas cooperate with the low heat value gas, and the invention is a technology with high efficiency and low pollution. A low NOx burner provided with a gas turbine and an afterburner boiler adopt a self-cycle preheating heat-storing volution type low NOx gas burning system, therefore the power consumption of the gas supercharger can be reduced by 10-20 percent and the thermal efficiency of the electricity generating of the combined cycle unit can be increased for 5-15 percent. The invention can also solve the problems of the technology difficulty for reconstructing the system and the project cost. The invention can also provide stable combustion for burning the low heat value gas (blast furnace gas), can enable steam cycle system to have larger installed capacity and higher efficiency, and can lower the kilowatt cost. The invention ensures that the combined cycle thermal efficiency can reach about 60 percent, the electricity generating efficiency of the power plant can reach about 55 percent, and the energy can be saved for above 80 percent. The invention can break through a bottleneck that the investment and the electricity generating cost of the intermediate low heat value gas electricity plant are much higher than that of high heat value combined cycle power plant, namely the economic problem, and then the investment cost of the intermediate low heat value gas power plant (or the IGCC) can be lowered greatly.

A combustion apparatus has a plurality of longitudinally elongated gas burners, each having a burner port on an upper end thereof. A damper is disposed to cover gas inlet ports on an upstream end of an air-fuel mixing tube portion of each of the gas burners. The damper has formed therein ventilation holes for limiting primary air. The ventilation holes overlap, and are smaller than, the gas inlet ports. The damper has #1 ventilation holes having obstacles against which the fuel gas to be ejected from the gas nozzles strike, and #2 ventilation holes without obstacles. Poor combustion such as flame lifting is restricted and combustion noises are reduced.

A control device for an on-board compression-ignition engine in which partial compression-ignition combustion including spark ignition (SI) combustion performed by combusting a portion of mixture gas inside a cylinder by spark ignition followed by compression ignition (CI) combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within at least a part of an operating range of the engine, is provided. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, and a combustion controller configured to control the combustion inside the cylinder during the partial compression-ignition combustion based on a combustion noise index value identified by the detected parameter of the detector and a given reference value defined as an upper limit of the combustion noise index value, the reference value increasing as a vehicle speed increases.

A control device for an engine in which partial compression-ignition combustion including SI combustion performed by forcibly combusting a portion of mixture gas inside a cylinder followed by CI combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine, is provided. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, a memory configured to store a characteristic defining a relationship between a start timing of the CI combustion and a combustion noise index, and a processor configured to specify a given combustion noise index value based on the detection value of the detector, and control the start timing of the CI combustion.

An internal combustion engine comprising the fuel injector arranged in the combustion chamber. The primary fuel injection and the secondary fuel injection from the fuel injector are successively performed to cause autoignition of an injected fuel of the primary fuel injection and autoignition of an injected fuel of the secondary fuel injection. A temperature region suppressing change of an ignition delay time where a change of ignition delay time with respect to a rise in temperature in the combustion chamber is suppressed appears in the compression stroke at a temperature in the combustion chamber of 700K to 900K. The secondary fuel injection is performed if the temperature in the combustion chamber is a temperature within the temperature region suppressing change of the ignition delay time during the compression stroke. The primary fuel injection is performed during the compression stroke or suction stroke before the temperature in the combustion chamber reaches a temperature in the temperature region suppressing change of the ignition delay time at a fuel injection timing at which the injected fuel of the secondary fuel injection is autoignited after the injected fuel of the primary fuel injection is autoignited.

The invention discloses a partial premix combustor, which comprises a jet nozzle (1) and an air inlet tube (6). The jet nozzle (1) is communicated with the air inlet tube (6). The partial premix combustor is characterized by further comprising an inner guide ring (2) and an outer guide ring (3). The inner guide ring (2) surrounds the jet nozzle (1), the outer guide ring (3) surrounds the inner guide ring (2), a first mixing area (7) is formed between the inner guide ring (2) and the jet nozzle (1), and a second mixing area (8) is formed between the outer guide ring (3) and the inner guide ring (2). By adopting the structure, the mixing process of gas and air is strengthened, the gas and the air are mixed completely, combustion noise is small, and the flame adjustment is stable.

A system and a method for controlling the number of pilot injections reduces combustion noise and improves fuel economy by deciding the actual number of the pilot injections based on a change amount of a driving condition and injecting a fuel according to the actual number of the pilot injections in a case of acceleration. The system may include a detecting portion detecting a driving condition of an engine; a control portion calculating a change amount of the driving condition from the driving condition of the engine, and deciding the actual number of the pilot injections based on the driving condition of the engine and the change amount of the driving condition; and an injector injecting a fuel to the engine through a main injection and/or the pilot injections according to the actual number of pilot injections.

A control system for a pre-mixture compression-ignition engine is provided, configured such that in a first combustion mode, the control unit controls the fuel injection valve to have a fuel amount within a mixture gas in an outer circumferential portion of the combustion chamber larger than in the center portion, the swirl generating part to generate a swirl flow in the outer circumferential portion, and the spark plug to ignite the mixture gas in the center portion. In a second combustion mode, the control unit controls the fuel injection valve to start a fuel injection on intake stroke so that the mixture gas is formed in the entire combustion chamber, the swirl generating part so that a swirl flow becomes weaker than in the first combustion mode, and the spark plug to ignite the mixture gas before CTDC.

The invention relates to a generator set shock absorption and noise reduction method based on noise source recognition. The method comprises the steps that a preset noise source is collected, a presetmatrix is established, and a noise reduction plan is preset; a noise detection module is arranged, and a noise monitor is connected with the corresponding position of the generator set; operating thegenerator set, detecting noise and establishing a detection matrix; comparing the detection matrix with a preset matrix; and selecting a corresponding noise reduction plan according to the detectionresult. According to the invention, different types of standard noise sources are pre-recorded; taking the noise source as a judgment reference; according to the method, the preset matrix is set to store the specified parameters in the noise into the sound source library, the types of the detected noise can be accurately judged by sequentially comparing the detected noise with the preset noise, the specific noise reduction method is used in a targeted mode according to the types of the noise, and the shock absorption efficiency of the method on the generator set can be effectively improved.