具有扫气功能的pfi发动机及其控制方法

PFI engine with air scavenging function and control method thereof

Abstract

The invention relates to a vehicle engine structure, in particular to a PFI engine with an air scavenging function. The PFI engine with the air scavenging function comprises a cylinder body, a piston, a sparking plug, an inlet manifold, an air scavenging airway, an oil and gas mixing airway and a driving mechanism, wherein the piston and the sparking plug are arranged in the cylinder body, the air scavenging airway and the oil and gas mixing airway are arranged between the inlet manifold and the cylinder body in a communicating mode, and the driving mechanism drives an air scavenging inlet valve and an oil and gas inlet valve to be opened asynchronously. The invention further relates to a control method of the PFI engine. According to the PFI engine with the air scavenging function and the control method thereof, the driving mechanism drives the air scavenging inlet valve and the oil and gas inlet valve to be opened asynchronously, air can be conveyed into the cylinder body firstly through the air scavenging airway so that air scavenging can be conducted on the cylinder body, then the oil and gas inlet valve is opened so that oil and gas can enter the cylinder body to be burnt, and therefore the power performance of the engine can be effectively improved; meanwhile, the oil and gas are prevented from entering an exhaust system and burning and then the phenomena of fuel oil waste and high discharging temperature are avoided.
本发明涉及一种车辆发动机结构,尤其涉及一种具有扫气功能的PFI发动机,其包括缸体、置于缸体内的活塞和火花塞、以及进气歧管,还包括连通设置在进气歧管与缸体之间扫气气道及油气混合气道,以及驱动扫气进气门和油气进气门异步开启的驱动机构。本发明同时涉及一种PFI发动机的控制方法。采用本发明的技术方案,通过驱动机构控制扫气进气门和油气进气门的异步开启,可先通过扫气通道向缸体内输送气体,以对缸体进行扫气,然后再开启油气进气门,使油气进入到缸体内进行燃烧,可以有效的提高发动机的动力性能,同时避免油气进入排气系统中燃烧而导致的燃油浪费及排放温度较高现象的发生。

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Cited By (1)

    Publication numberPublication dateAssigneeTitle
    CN-104074616-AOctober 01, 2014李涛发动机的燃料喷射和进气方法