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Exhaust cam of pressurizing type gasoline direct injection engine

A technology of exhaust cam and gasoline engine, which is applied in the direction of valve details, valve driving devices, etc., can solve the problems of poor acceleration at low speed, powerless engine at low speed, large response hysteresis, etc., to improve low-speed performance, high torque and power, reduce The effect of the degree of hysteresis

Inactive Publication Date: 2015-03-11
力帆科技(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the exhaust cam used in supercharged direct-injection gasoline engines has a problem of large response delay when running at low speeds, resulting in low-speed engine powerlessness and poor low-speed acceleration, which affects the low-speed performance of the engine.

Method used

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  • Exhaust cam of pressurizing type gasoline direct injection engine
  • Exhaust cam of pressurizing type gasoline direct injection engine
  • Exhaust cam of pressurizing type gasoline direct injection engine

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Embodiment Construction

[0020] The core of the invention is to provide an exhaust cam for a supercharged direct injection gasoline engine, which reduces the response hysteresis of the exhaust cam at low speed and improves the low-speed performance of the engine.

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] Please refer to figure 1 and figure 2 , the embodiment of the present invention provides an exhaust cam for a supercharged direct injection gasoline engine. The cam profile of the exhaust cam includes a buffer sect...

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Abstract

The invention discloses an exhaust cam of a pressurizing type gasoline direct injection engine. A cam molded line of the exhaust cam comprises an air valve opening side buffering section, an air valve closing side buffering section, a working section and a base circle section, wherein a wrapping angle of the working section is in a range of 240-250 degrees; an included angle of the air valve opening side buffering section is 25-30 degrees and the height of the buffering section is more than 0.15mm; the maximum lift H of the cam molded line is 5mm-5.5mm. The test of the exhaust cam shows that the exhaust cam enables an engine to keep the output of 350N.m torque in a rotary speed range of 1500r / min-4500r / min; meanwhile, a design target of output power being 155Kw is reached under the condition that the rotary speed of the engine is a rated rotary speed being lower than 5500r / min; therefore, the engine can provide higher torque and power under low-speed operation, the lagging degree is reduced, and the low-speed performance of the engine is improved.

Description

technical field [0001] The invention relates to the technical field of engine cams, in particular to an exhaust cam for a supercharged direct injection gasoline engine Background technique [0002] At present, the exhaust cam used in supercharged direct-injection gasoline engines has the problem of large response lag when running at low speeds, resulting in weak engine power at low speeds and poor acceleration at low speeds, which affects the low-speed performance of the engine. [0003] Therefore, how to reduce the response hysteresis of the exhaust cam at low speed and improve the low speed performance has become an urgent problem to be solved by those skilled in the art. Contents of the invention [0004] In view of this, the object of the present invention is to provide an exhaust cam for a supercharged direct-injection gasoline engine, so as to reduce the response hysteresis of the exhaust cam at low speed and improve the low-speed performance of the engine. [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/08
CPCF01L1/08
Inventor 李晓君赵升洲阎强王坤唐素芳王钊姚贵东刘伟
Owner 力帆科技(集团)股份有限公司
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