CN106286042A

CN106286042A - A Novel section-variable and tumble flow gas handling system

Info

Publication number: CN106286042A
Application number: CN201510355167.4A
Authority: CN
Inventors: 丁树勇; 李慧军; 由毅
Original assignee: Shanghai Silver Wheel Thermal System Technology Co Ltd
Current assignee: Shanghai Silver Wheel Thermal System Technology Co Ltd
Priority date: 2015-06-18
Filing date: 2015-06-18
Publication date: 2017-01-04

Abstract

The invention discloses a Novel section-variable and tumble flow gas handling system, this system is by changing the inlet manifold air inlet cross section under running on the lower load, thus improve induction air flow ratio, fit into airway clapboard and improve air inlet Tumble and swirl, reduce the cylinder injection fuel oil wet wall phenomenon to cylinder sleeve, piston-top surface and valve, reduce carbon distribution, reduce discharge, reduce oil dilution rate, improve gaseous mixture uniformity, fuel economy.When high load capacity, by adjusting air inlet cross section, reduce intake resistance, provide enough air inflows for electromotor, it is ensured that car load demand powerful to electromotor.

Description

A Novel section-variable and tumble flow gas handling system

Technical field

Automotive engine air intake system

Background technology

How the raising day by day required automobile engine fuel economy along with environmental protection, the increasingly stringent of Abgasgesetz and consumer, meet automobile engine low emission and high fuel economy has become the problem that motor-dom currently must solve.Develop that automobile-used have gasoline engine low emission advantage to have the electromotor of diesel engine sub-load height fuel-economy type advantage be a current goal in research simultaneously.

For the side-mounted directly jetting gasoline engine of fuel injector, due to its fuel injector side, in injection process, oil bundle and the downward-sloping a certain angle in cylinder baseplane, advance with injection time, under the operating mode that charge air flow intensity is relatively low, spraying will necessarily collide with cylinder wall surface, piston-top surface, causes the problems such as carbon distribution, oil dilution, deterioration of emission.So when sub-load, charge flow rate is little, it is desirable to have higher induction air flow ratio, improve charging efficiency, at the same time it is wished that there is higher Tumble and swirl, reduce fuel oil wet wall phenomenon, reduce oil dilution rate, improve efficiency of combustion.

For gas-duct jetting gasoline engine, under low speed sections load condition, engine demand air inflow is less, and throttle valve loss is big, and the air inlet cross section after throttle body is relatively big, causes air inlet intensity relatively low, is unfavorable for air-fuel mixture；Tumble intensity is low, and burn rate is slow, is unfavorable for the raising of fuel economy.

It is known that the Tumble and swirl of air intake duct and discharge coefficient are conflicting, Tumble and swirl is the biggest, and discharge coefficient is the lowest；In air inlet pressure compression process, form higher Tumble and swirl, higher turbulence intensity can be produced before compression top center, accelerate flame propagation velocity, shorten combustion duration, reduce heat transfer loss, thus improve indicated thermal efficiency.And current air intake system structure, the inlet structure of the low Tumble and swirl of big discharge coefficient is have chosen in order to take into account high low-speed performance, so combustion duration is longer, the thermal efficiency is relatively low.

Summary of the invention

This patent is by changing the inlet manifold air inlet cross section under running on the lower load, thus improve induction air flow ratio, fit into airway clapboard and improve air inlet Tumble and swirl, reduce the cylinder injection fuel oil wet wall phenomenon to cylinder sleeve, piston-top surface and valve, reduce carbon distribution, reduce discharge, reduce oil dilution rate, improve gaseous mixture uniformity, fuel economy.When high load capacity, by adjusting air inlet cross section, reduce intake resistance, provide enough air inflows for electromotor, it is ensured that car load demand powerful to electromotor.

Accompanying drawing explanation

Fig. 1 is that variable cross section amasss tumble flow gas handling system schematic diagram

In figure: (1) piston (2) cylinder sleeve (3) cylinder cap (4) fuel injector (5) inlet manifold rotary valve plate

(6) inlet manifold main body (7) air intake duct dividing plate (8) inlet valve (9) spark plug (10) exhaust valve

Detailed description of the invention

The variable cross section of the present invention and tumble flow gas handling system include inlet manifold and cylinder cap inlet structure.Inlet manifold is all layered double-decker from pressure stabilizing cavity to each arm, has a rotary valve plate in pressure stabilizing cavity, can be according to different operating mode different rotation angle；Equipped with a dividing plate on cylinder cap air intake duct, also air intake duct is divided into upper and lower two-layer, cooperates with inlet manifold hierarchy, cylinder cap is also equipped with inlet and exhaust valve, intake and exhaust conduit and intake and exhaust seat ring；Fuel injector may be installed air intake duct below or above, depends on different spray regimes.

In low-load conditions, air inlet pressure stabilizing cavity rotary valve does not rotates, air-flow can only pass through from inlet manifold and air intake duct upper strata, air-flow tangentially enters along inlet valve seat ring and combustion chamber wall surface, inswept exhaust valve bottom surface, move downward along casing wall, along with unlatching and the descent of piston of inlet valve form large scale eddy flow, i.e. tumble flow；Effect due to airway clapboard water conservancy diversion so that at valve with seat ring aditus laryngis, having little air-flow process below dividing plate, the tumble flow of such large scale is formed in induction stroke.Along with piston stroking upward, large scale tumble flow flow velocity is gradually strengthened, until close to compression top center, large scale tumble flow is broken into a large amount of little eddy current, adds the turbulence intensity of time of ignition, flame transmission speed when improve burning, thus shorten combustion duration, decrease the heat transfer loss of expansion stroke, thus improve the thermal efficiency, reduce fuel oil consumption.And for side-mounted in-cylinder direct-jet system, well-regulated strong tumble motion in cylinder, prevent excessive the advancing of spraying, reduce Spray penetration distance, thus avoid the wet wall of fuel oil.Meanwhile, air-flow only passes through from upper strata, and a tube section of airflow passes reduces, under identical flow condition, cross section is the least, and air velocity is the highest, thus utilizes the effect of inertia of air-flow, suitably adjust valve timing phase place, improve charging efficiency, and then promote low speed torque, and due to the reduction of air inlet cavity volume, air-flow response also can improve, thus improves car load acceleration.

Under middle and high load working condition, air inlet pressure stabilizing cavity rotary valve turns an angle, and air-flow can be from the air inlet simultaneously of the upper and lower two-layer of inlet manifold and air intake duct, and the angle rotated due to valve plate is different, can control under different operating mode Tumble intensity and the requirement of discharge coefficient.When valve block fully opens, at valve and seat ring aditus laryngis, air-flow pours in cylinder from valve surrounding, improves the discharge coefficient of air inlet, meets the high load working condition requirement to air inflow.

The control of rotary valve plate uses electric drive closed loop control so that valve plate is freely rotatable between 0-90 °, it is ensured that the precision of control and susceptiveness.

Claims

The most a Novel section-variable and tumble flow gas handling system include inlet manifold and cylinder cap inlet structure.It is characterized in that: inlet manifold is from pressure stabilizing cavity All it is layered double-decker to each arm, in pressure stabilizing cavity, has a rotary valve plate, can be according to different operating mode different rotation angle；Cylinder cap air intake duct On equipped with a dividing plate, also air intake duct is divided into upper and lower two-layer, with inlet manifold hierarchy phase interworking.
Variable cross section the most according to claim 1 and tumble flow gas handling system, it is characterised in that: under middle-low load working condition, inlet manifold rotary valve Plate is closed so that inlet flow cross section reduces, thus flow velocity is higher, and air-flow flows through from inlet manifold upper strata with higher flow velocity, passes through air inlet Unexposed layer, substantial amounts of air-flow is rolled in cylinder along combustion chamber wall surface, thus forms strong tumble flow.Under high load working condition, inlet manifold rotates Valve plate standard-sized sheet, air-flow enters the two layer cross sections air inlet simultaneously up and down of the upper and lower two parts of pressure stabilizing cavity, each air intake branch and air intake duct, thus improves Coefficient of charge.
Variable cross section the most according to claim 1 and tumble flow gas handling system, it is characterised in that: the control of rotary valve plate uses electric drive closed loop control System so that valve plate is freely rotatable between 0-90 °, it is ensured that the precision of control and susceptiveness.