Cylinder deactivation engine valve stop camshaft device

Abstract

The invention relates to a cylinder deactivation engine valve stop camshaft device, belonging to the technical field of engines. A hydraulic control system, a chute slide system and a camshaft main body system are respectively arranged on the left, middle and right parts of a camshaft, wherein the upper end of a valve guide rod a and a cam a form a slide connection, and the upper end of a valve guide rod b and a cam b form a slide connection. When a locating pin slides on a sliding chute a, the upper end of a valve guide rod c and a normal-contour cam a form a slide connection, and the upper end of a valve guide rod d and a normal-contour cam b form a slide connection. When the locating pin slides on a sliding chute b, the upper end of the valve guide rod c and a base-circle-contour cam a form a slide connection, and the upper end of the valve guide rod d and a base-circle-contour cam b form a slide connection. By using the camshaft device, the engine adopting the cylinder deactivation technique can implement no ventilation of the non-working cylinder, thereby ensuring the excess air coefficient of the exhaust, and giving consideration to the emission property of the cylinder deactivation engine. The cylinder deactivation engine valve stop camshaft device has the advantages of high control accuracy, smooth transition, simple structure and low cost, and is easy to manufacture and convenient for popularization.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a camshaft device for a cylinder-deactivated engine and a valve-deactivated camshaft. Background technique [0002] When the traditional automobile engine works under medium and small loads, the throttle opening is small and the pumping loss is large; the ventilation is not good, the residual exhaust gas in the engine cylinder is large, the combustion stability and integrity are poor, and the fuel consumption deteriorates. If the cylinder deactivation technology is adopted in the medium and small load conditions of a multi-cylinder engine, some cylinders will stop working. For example: in a four-cylinder engine, two cylinders will stop working. In order to ensure the same power output, the remaining working cylinders must increase the intake air volume and intake pressure. At the same time, the increase of intake pressure will also improve the charging efficiency of t...

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Problems solved by technology

[0003] However, when the engine adopts cylinder deactivation technology, if only the fuel injection and ignition of the deactivated cylinder are interrupted, the deactivated cylinder will still continue to intake and exhaust air, which will have a very bad negative impact on engine emissions

At present, most automobile engines use three-way catalytic converters to treat exhaust emissions. The three-way catalytic converters can only treat hydrocarbons, carbon monoxide and nitrogen oxides at the same time when the excess air ratio is around 1. Conversion efficiency, if the non-working cylinder continues to intake air, the air volume in the exhaust manifold of the engine will be greatly increased, the excess air coefficient will be much greater than 1, the conversion efficiency of nitrogen oxides in the exhaust will decrease significantly, and the emission will deteriorate

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