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A Control System of In-Cylinder State of Variable Displacement Engine

An engine cylinder and state control technology, applied in engine control, combustion engine, engine components, etc., can solve the problems of flash boiling and emission deterioration, and achieve the effect of suppressing flash boiling and vaporization, avoiding abnormal opening and closing, and prolonging the cylinder stop time.

Active Publication Date: 2020-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a control system for the in-cylinder state of a variable displacement engine, which cuts off the starting path between the valve and the cam through the oil pressure controller, which can effectively solve the problem of a large amount of engine oil being blocked when the variable displacement engine is in the cylinder deactivation mode. Problems such as flash boiling and emission deterioration caused by suction cylinder

Method used

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  • A Control System of In-Cylinder State of Variable Displacement Engine
  • A Control System of In-Cylinder State of Variable Displacement Engine
  • A Control System of In-Cylinder State of Variable Displacement Engine

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Embodiment 1

[0027] This embodiment provides a control system for the state in the cylinder of a variable displacement engine, which is used to control the pressure state in the cylinder of the engine, so as to solve the problem of the high temperature and low pressure environment formed by the piston still reciprocating when the cylinder of the variable displacement engine stops fuel injection. Ingress into the cylinder from the gap between the piston and the cylinder wall creates flash boiling which exacerbates the emissions problem.

[0028] Such as figure 1 As shown, the control system includes: cam rocker arm system, valve system, rocker arm connection system, oil delivery system and oil pressure control system. A set of this system is provided at the exhaust port of each cylinder of the variable displacement engine to control the opening and closing of the exhaust valve.

[0029] Wherein the cam rocker arm system includes: cam 7, intermediate shaft 1, intermediate shaft support bloc...

Embodiment 2

[0040] On the basis of the above-mentioned embodiment 1, a set of the system is provided at the intake port of each cylinder of the variable displacement engine to control the opening and closing of the intake port. The system set at the intake valve is only used in the normal working mode of the engine to control the opening and closing of the intake port. In the engine cylinder deactivation mode (some cylinders stop working), the control signal input to the oil pressure regulator Input the low-pressure oil signal, and the oil pressure regulator outputs low-pressure oil through the oil outlet, so that the corresponding air inlet is always closed.

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Abstract

The invention discloses an in-cylinder state control system of a variable displacement engine. The problems of flash boiling, emission deterioration and the like which are caused by a large amount ofengine oil being sucked into a cylinder when the variable displacement engine is in a cylinder stop mode are solved. The in-cylinder state control system of the variable displacement engine comprisesa cam rocker arm system, a valve system, a rocker arm connecting system, an engine oil conveying system and an engine oil pressure regulator. The valve system opens or closes an exhaust opening through an exhaust valve arranged at the exhaust opening, and the cam rocker arm system comprises a valve shaft, a cam, an intermediate shaft and a rocker arm. The valve shaft is used for pushing the exhaust valve to move to open the exhaust opening, the cam is matched with the intermediate shaft fixedly connected to one end of an intermediate shaft supporting block, the valve shaft is connected with the other end of the intermediate shaft supporting block, and the intermediate shaft supporting block can rotate around the valve shaft. The rock arm is connected with the intermediate shaft supportingblock through a rock arm connecting system. The connection or disconnection between the intermediate shaft supporting block and the rocker arm is controlled according to the engine oil pressure outputfrom an engine oil delivery line, and the engine oil pressure regulator is used for controlling the engine oil pressure output from the engine oil delivery line.

Description

technical field [0001] The invention relates to an in-cylinder state control system, in particular to a variable-displacement engine in-cylinder state control system, which belongs to the technical field of internal combustion engine control. Background technique [0002] For variable displacement engines, cylinder deactivation technology refers to a variable displacement technology that stops some cylinders of the internal combustion engine under low load conditions and increases the load on the remaining cylinders, thereby reducing pumping loss and heat loss, and improving thermal efficiency. One of the most promising technologies for drastically reducing fuel consumption and emissions of internal combustion engines. The current variable displacement engine mainly achieves the stop operation of a specific cylinder by cutting off the starting path between the valve cam and the valve. [0003] However, in the actual operation of the engine, when the variable displacement en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D13/06F02D13/02F01L1/46
CPCF01L1/46F02D13/0207F02D13/0276F02D13/06Y02T10/12
Inventor 王字满戴晓宇刘福水李佳峰吴晗李志爽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY