Engine internal residual exhaust gas measuring device and method
A technology of residual exhaust gas and measuring devices, applied in measuring devices, mass flow measuring devices, measuring flow/mass flow, etc., can solve problems such as lack of test methods
Active Publication Date: 2014-10-15
HANGZHOU DIANZI UNIV
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Problems solved by technology
However, there is still a lack of accurate and feasible test methods for the amount of internal residual exhaust gas caused by valve stacking under different working conditions during the intake and exhaust process.
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[0033] Such as figure 1 As shown, the present embodiment includes an engine, a high-pressure gas source 1, an intake flow sensor 2, an intake pressure sensor 3, a cylinder pressure sensor 5, an exhaust pressure sensor 7, an exhaust pressure regulating valve 8 and a crank angle encoder 10. The air outlet of the high-pressure air source communicates with the intake valve 4 of the engine through the intake pipe. An intake air flow sensor and an intake pressure sensor are installed on the intake pipe. The intake pressure sensor is 2-3 times the diameter of the intake valve. A steady flow state is formed within this distance range. A cylinder pressure sensor is installed on the cylinder head of the engine. The exhaust valve 6 of the engine is connected to the outlet pipe, and an exhaust pressure sensor and an exhaust pressure regulating valve 8 are installed on the outlet pipe, and the exhaust pressure sensor is 2-3 times of pipe diameter away from the exhaust valve. A crankshaft...
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The invention relates to an engine internal residual exhaust gas measuring device and an engine internal residual exhaust gas measuring method. The gas outlet of a high-pressure gas source is communicated with a gas inlet door of an engine by a gas inlet pipe; a gas inlet flow sensor and a gas inlet pressure sensor are mounted on the gas inlet pipe; a cylinder pressure sensor is mounted on a cylinder cover of the engine; an exhaust door of the engine is connected with a gas outlet pipe; an exhaust pressure sensor and an exhaust pressure adjusting valve are mounted on the gas outlet pipe; a crank angle coder is mounted on a crank of the engine. The method is used for measuring the pressure of the gas inlet pipe, the pressure of a cylinder and the change of the pressure of the exhaust pipe along with the crank angle; according to the pressure difference between the gas inlet pipe and the cylinder and the pressure difference between the gas inlet pipe and the exhaust pipe, the exhaust gas flow is calculated, the accumulated exhaust amount in the gas inlet pipe and the exhaust pipe is thus obtained, and finally, the residual exhaust gas coefficient which is caused by the backflow of the exhaust pipe can be determined. According to the engine internal residual exhaust gas measuring device and the engine internal residual exhaust gas measuring method, the engine internal residual exhaust gas amount can be measured under the conditions of different rotate speeds, different valve timing and different gas inlet and exhaust pressures.
Description
technical field [0001] The invention relates to the technical field of engine testing, in particular to a device and method for measuring residual exhaust gas inside an engine. Background technique [0002] During the intake and exhaust process of the engine, due to the existence of the valve overlap period, the exhaust gas in the exhaust pipe and cylinder may flow back into the intake pipe to form internal residual exhaust gas. [0003] At present, controlling the amount of residual exhaust gas in the cylinder has become an important method for engines to reduce NOx generation, and has been widely used in the engine industry. However, there is still a lack of accurate and feasible test methods for the amount of internal residual exhaust gas caused by valve stacking under different working conditions during intake and exhaust. Contents of the invention [0004] Aiming at the deficiencies of the prior art, the invention provides a device and method for measuring residual e...
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IPC IPC(8): G01F1/88G01F1/00
Inventor 刘忠民吴军张启平
Owner HANGZHOU DIANZI UNIV