Air intake system of gasoline engine and air inflow control method

Abstract

The invention relates to an air intake system of a gasoline engine. The air intake system comprises an electric control unit, a pipeline, a turbocharger (1) and a variable valve. The variable valve comprises an intake valve (3) and an exhaust valve (4). The turbocharger (1) comprises an exhaust gas bypass valve (2). The air intake system also comprises an intake switching valve (5) which is placed in a pipeline between the air inlet and the air intake door (3) of the turbocharger (1). The electric control unit controls the intake switching valve (5) to switch between two air inflow modes. During work, air enters into an air cylinder (9) through the air inlet of the turbocharger (1), the intake switching valve (5) and the intake valve (3), and exhaust gas is discharged out of the air cylinder (9) through the exhaust valve (4) and is discharged out of the gasoline engine through the exhaust gas bypass valve (2) and the air outlet of the turbocharger (1). Compared with the prior art, the air intake system of the gasoline engine without a throttle valve reduces the throttling loss caused by the throttle valve body, improves the problem of throttle percentage and nonlinear flow, and improves the torque control precision.

Description

technical field [0001] The invention relates to the field of gasoline engine and automobile electronic control, in particular to a gasoline engine air intake system and an air intake volume control method. Background technique [0002] For the spark ignition internal combustion engine, since the air-fuel ratio is near 1, the torque output mainly depends on the amount of circulating intake air. According to the size of the intake pressure, the engine can be divided into a naturally aspirated engine and a supercharged engine. Supercharged engines can be divided into turbocharged engines and supercharged engines. Common actuators for air intake control are throttle valves (naturally aspirated) or throttle valves + wastegate valves (turbocharged). A throttle valve is essential to a spark ignition engine. However, the non-linearity between the flow coefficient and the throttle opening angle makes it difficult to precisely control the torque. At the same time, under the condit...

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Problems solved by technology

None of the above patents can avoid the use of a throttle valve, and cannot reduce the throttling loss caused by the throttle body, which will cause poor fuel economy under small load conditions; and the above patents use a single device to control the intake air, which cannot realize the multi-level control of

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