Variable valve timing (VVT) oil supply circuit

Abstract

The invention discloses a variable valve timing (VVT) oil supply circuit which comprises an air inlet VVT control oil circuit, an exhaust VVT control oil circuit, and an air inlet main oil channel, anair inlet auxiliary oil channel, an exhaust main oil channel and an exhaust auxiliary oil channel arranged on a cylinder cover. One end of the air inlet main oil channel communicates with an air inlet oil channel of a cylinder body; the other end of the air inlet main oil channel communicates with the air inlet auxiliary oil channel; the air inlet auxiliary oil channel communicates with the air inlet VVT control oil circuit; one end of the exhaust main oil channel communicates with an exhaust oil channel of the cylinder body; the other end of the exhaust main oil channel communicates with theexhaust auxiliary oil channel; and the exhaust auxiliary oil channel communicates with the exhaust VVT control oil circuit. According to the oil circuit, an interaction effect of oil pressure at theair inlet side and oil pressure at the exhaust side can be avoided, and the responsiveness of VVT is ensured.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to a VVT oil supply oil circuit. Background technique [0002] In order to meet the increasingly stringent requirements of engines in terms of power, economy and emissions, engine upgrades are urgently needed, and more and more new technologies (such as VVT, variable valve timing) are applied to automobile engines and promote. VVT technology can improve engine power, fuel economy and meet new emission regulations. [0003] In the VVT ​​oil supply oil circuit of the existing VVT engine, there is a cylinder head main oil channel, which is divided into the intake side and the exhaust side, and supplies oil to the intake VVT ​​and exhaust VVT. The oil pressure on the intake side and the oil pressure on the exhaust side affect each other and the VVT ​​response is slow. [0004] In addition, in the existing VVT oil supply circuit, the oil control valve controllin...

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Problems solved by technology

[0003] In the VVT ​​oil supply oil circuit of the existing VVT engine, there is a cylinder head main oil channel, which is divided into the intake side and the exhaust side, and supplies oil to the intake VVT ​​and exhaust VVT. The mutual influence of the oil pressure on the intake side and the oil pressure on the exhaust side and the slow response of VVT

[0004] In addition, in the existing VVT oil supply circuit, the oil control valve controlling VVT adopts plug-in type and is arranged and installed on the cylinder head. It is necessary to arrange multiple oil passages to connect the VVT ​​and the oil control valve to form a control oil circuit, resulting in The direction of the oil circuit has changed direction many times, and the pressure loss of the system increases. When the camshaft phase needs to be adjusted, the VVT ​​adjusts the camshaft phase for a long time and at a slow speed, resulting in poor response of the VVT, thus limiting the performance of the VVT ​​system

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