The Measuring Method of the Engine Fuel Supply Advance Angle Measuring System
A fuel supply advance angle and measurement method technology, which is applied to the engine fuel supply advance angle measurement system and measurement field, can solve the problems of inability to dynamically measure the online detection of automobiles, inconvenience, and large errors, and achieve simple and accurate measurement methods, reduce The effect of cost, installation and testing convenience
Inactive Publication Date: 2015-08-19
上海毅拓电子科技有限公司
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Problems solved by technology
At present, the oil spill method, flash method, vibration method, etc. are commonly used to detect the fuel supply advance angle in production and maintenance, and there are disadvantages such as large errors, inability to measure dynamically, or inconvenient on-line vehicle detection.
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] First, combine Figure 4, taking the relationship diagram of diesel engine cylinder pressure, instantaneous speed and crank angle as an example to illustrate the relationship between the lowest point of instantaneous speed and the top dead center of piston. From the instantaneous rotational speed waveform 15 and the cylinder pressure waveform 16, it can be seen that when the piston of the first cylinder moves to the vicinity of the compression top dead center, the pistons of the second, third and fourth cylinders will respectively travel to the expansion bottom dead center, intake air, etc. Near the bottom dead center and exhaust top dead center, because the gas pressure acting on the piston is very small at this time, the sum of the torques of these cylinders acting on the crankshaft can be ignored. Therefore, near the compression top dead cent...
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The invention relates to an engine fuel supply advance angle measuring system, which comprises a revolution speed transducer, an oil pressure sensor, a signal processing module and a microprocessing unit, wherein the output ends of the revolution speed transducer and the oil pressure sensor are connected with the input end of the signal processing module, and the output end of the signal processing module is connected with the input port of the microprocessing unit. A measuring method provided by the invention includes the following steps of: (2) measuring oil pressure and revolution speed signals; (3) finding a synchronization point; (4) getting a lowest point and a start point; (6) obtaining an included angle; and (8) acquiring a fuel supply advance angle. By the measuring system provided by the invention, accurate measuring for the fuel supply advance angle can be realized through the revolution speed signal and the pressure signal; and non-extra-load power measuring for a diesel engine and detecting for uniformity of each cylinder can also be realized. According to the measuring method provided by the invention, the lowest point of instantaneous revolution speed is utilized to get a top dead center of piston compression, and the fuel supply advance angle is acquired through the revolution speed signal and the pressure signal, so that accurate measuring for the fuel supply advance angle is realized.
Description
technical field [0001] The present invention relates to a measurement system and method for engine fuel supply advance angle, more specifically, to an engine fuel supply advance angle measurement system equipped with an oil pressure sensor and a rotational speed sensor, and uses the lowest point of rotational speed to calculate The engine fuel supply advance angle measurement method is based on taking the top dead center of the piston and using the oil pressure signal and the speed signal to calculate the advance angle. Background technique [0002] Diesel engines play a pivotal role in the national economy and daily life. Due to the complex movement of various components and the harsh working environment, various failures are prone to occur, which directly or indirectly cause huge economic losses. [0003] The fuel supply advance angle refers to the crankshaft angle experienced from the moment when the fuel injection pump plunger starts to close the inlet and return holes t...
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IPC IPC(8): F02P17/02
Inventor 刘杨吴亚兰程勇徐江曼黄万友
Owner 上海毅拓电子科技有限公司