Air-fuel ratio control system of gas engine
A gas engine and control system technology, applied in engine control, electrical control, combustion engine, etc., can solve the problems of poor control reliability, inability to adjust air-fuel ratio or air-fuel ratio, etc.
Inactive Publication Date: 2012-07-18
BC P INC CHINA NAT PETROLEUM CORP +1
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[0003] In view of this, the object of the present invention is to provide a gas engine air-fuel ratio control system, which can solve the problem that the existing gas engine cannot adjust the air-fuel ratio according to the change of the engine gas source or the air-fuel ratio control reliability is poor
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[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The following description is only exemplary and does not limit the protection scope of the present invention.
[0012] Such as figure 1 As shown, a gas engine air-fuel ratio control system, wherein the engine 5 is provided with an intake manifold 7 for air intake to the engine 5 and an exhaust manifold 4 for exhausting exhaust gas, it also includes an air-gas mixer 8, a mixing Gas control valve 9, gas throttle valve 10, ECU12 and temperature sensor 13; air gas mixer 8 has two gas inlets and a mixed gas outlet, wherein the two gas inlets are respectively connected to the gas pipe 11 and the air pipe 14, and the mixed gas outlet Connecting the intake main pipe 7 corresponds to the other end connected to the engine 5; the mixture control valve 9 is installed on the intake main pipe 7; the gas throttle valve 10 is arranged on the gas pipe 11; the temperature ...
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The invention discloses an air-fuel ratio control system of a gas engine, which comprises an air-fuel mixer, a mixed gas control valve, a fuel throttle valve, an ECU (electronic control unit) and a temperature sensor. The air-fuel mixer is provided with two gas inlets and a mixed gas outlet, the two gas inlets are connected with a fuel pipe and an air pipe respectively, the mixed gas outlet is connected with one end of an intake manifold corresponding to the other end of the intake manifold connected with the engine, the mixed gas control valve is mounted on the intake manifold, the fuel throttle valve is arranged on the fuel pipe, the temperature sensor is mounted on an exhaust manifold, and the ECU is respectively connected with the mixed gas control valve, the fuel throttle valve and the temperature sensor. The temperature sensor is used for acquiring exhaust temperature and sending feedback signals to the ECU, and the ECU is used for receiving the signals, processing the signals into data signals, comparing the data signals with a MAP prefabricated by the ECU to send control signals and feeding back the control signals to the mixed gas control valve and the fuel throttle valve, so that the air-fuel ratio and the exhaust temperature are controlled. The air-fuel ratio control system can solve the problem that an existing gas engine cannot adjust the air-fuel ratio according to change of a gas source of the engine or is poor in air-fuel ratio control reliability.
Description
technical field [0001] The invention relates to the technical field of gas engine components, in particular to a gas engine air-fuel ratio control system. Background technique [0002] Energy saving and emission reduction is the development trend of the internal combustion engine industry. The development of gas engines can effectively control the harmful emissions and carbon emissions of the engine. The air-fuel ratio control method of gas engines in my country adopts simple proportional mixer or exhaust oxygen content feedback control method. Although the proportional mixer has a simple structure, it cannot adjust the intake ratio of gas and air according to the change of engine power and air source, which is not conducive to the control of engine emissions and the utilization of energy; the feedback control method of exhaust oxygen content will be damaged after the sensor is poisoned. Failure, one of the main uses of gas engines is biogas power generation projects, a...
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Login to View More IPC IPC(8): F02D41/14F02B37/00
CPCY02T10/144Y02T10/12
Inventor 李树生李全武郑圣彬王令金赵二兰
Owner BC P INC CHINA NAT PETROLEUM CORP