CN101413409A

CN101413409A - Four-stroke internal combustion engine distribution timing mechanism

Info

Publication number: CN101413409A
Application number: CNA2008101828752A
Authority: CN
Inventors: 史建波
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-11
Filing date: 2008-12-11
Publication date: 2009-04-22

Abstract

The invention relates to a valve timing mechanism for a four-stroke internal combustion engine. The valve timing mechanism comprises a cylinder head, a valve stroke sensor, a valve stroke control electromagnetic valve and an iron core, wherein a bottom part of the cylinder part is provided with a valve which has a valve spring. An upper end of the valve is tightly pressed by the iron core fixed on the valve. A lower end of the valve is fixed at the bottom of the valve stroke control electromagnetic valve which is arranged on an upper part of the cylinder head. The inside of the valve stroke control electromagnetic valve is provided with an electromagnetic coil. One end of the electromagnetic valve is connected with a positive end controlled by an ignition switch, while the other end is grounded through an engine control computer. The mechanism has the advantages of saving a plurality of mechanical parts, reducing the volume of the engine, simplifying the structure of the engine, saving a throttle valve, effectively reducing operational noises of the engine, facilitating maintenance and manufacture, increasing reverse drive breaking force of the engine and reducing wear of a brake pad.

Description

A kind of four-stroke internal combustion engine distribution timing mechanism

Technical field

The present invention relates to field of internal combustion engine, relate in particular to a kind of four-stroke internal combustion engine distribution timing mechanism.

Background technique

Existing piston formula quartastroke engine all is the distribution devices that adopt mechanical type camshaft actuated inlet door and exhaust valve, the mechanical transmission that moves through between bent axle and camshaft and camshaft and each the cylinder valve of valve is controlled regularly, distribution drives needs process usually: crankshaft gear → chain (or Timing Belt) → camshaft wheel → camshaft → tappet → rocking arm → valve, in this process, can produce chain itself, chain and carrier bar, camshaft and tappet, tappet and rocking arm; the noise that rocking arm and valve etc. contact; for a long time; this mechanical structure is proved to be simple; effectively and reliably, and expense is relatively cheap.Yet the deficiency of this structure is, noise is big during work, it is big to take up room, complex structure, in addition, in the control of EGR (gas recirculation system), the common engine computer is according to the rotating speed of present engine, load (throttle opening), temperature, charge flow rate, signals such as delivery temperature, in good time control EGR solenoid valve is opened, the EGR solenoid valve is connected vacuum line control EGR vacuum execution valve and is opened, waste gas in the part exhaust enters into the gas handling system of motor by pipeline, this control mode needs often to clean closure, advance, exhaust valve aperture and time, valve lifts etc. are changeless on parameter, are unfavorable for the maintenance and the research and development of motor.

Summary of the invention

The purpose of this invention is to provide a kind of four-stroke internal combustion engine distribution timing mechanism, with distribution timing mechanism big, the baroque deficiency of noise when working that overcomes existing quartastroke engine.

The objective of the invention is to be achieved through the following technical solutions:

A kind of four-stroke internal combustion engine distribution timing mechanism, comprise cylinder head, valve lift sensor, valve lift control electromagnetic valve and iron core, be fixed with valve guide bushing on the described cylinder head, valve guide bushing is provided with valve oil seal, the bottom of cylinder head is provided with valve, valve is provided with valve spring, and described valve spring upper end is by being fixed on laterostigmatal core pressing, and the valve spring lower end then is fixed on the bottom of valve lift control electromagnetic valve; Described valve lift control electromagnetic valve is located at the top of cylinder head, valve lift control electromagnetic valve shell is provided with the valve lift sensor, valve lift control electromagnetic valve inside is provided with electromagnetic coil, one end of electromagnetic coil is connected the positive terminal through ignition switch control, and the other end of electromagnetic coil is by engine control computer ground connection.

Beneficial effect of the present invention is: adopt automatically controlled valve timing system, numerous mechanical parts have been cancelled, reduced the volume of motor, simplify the structure of motor, can save closure, effectively reduced the running noise of motor, for ease of maintenaince and make, under the situation that does not increase any mechanical part, can increase the anti-dragged brake ability of motor, reduce the wearing and tearing of brake block.

Description of drawings

With reference to the accompanying drawings the present invention is described in further detail below.

Fig. 1 is the structural representation of the described four-stroke internal combustion engine distribution timing mechanism of the embodiment of the invention;

Fig. 2 is the control flow schematic representation of the described four-stroke internal combustion engine distribution timing mechanism of the embodiment of the invention.

Among the figure:

1, valve control electromagnetic valve; 2, iron core; 3, valve; 4, electromagnetic coil; 5, valve lift sensor; 6, cylinder head; 7, valve spring; 8, valve guide bushing; 9, valve oil seal.

Embodiment

Shown in Fig. 1-2, the described a kind of four-stroke internal combustion engine distribution timing mechanism of the embodiment of the invention, comprise cylinder head 6, valve lift sensor 5, valve lift control electromagnetic valve 1 and unshakable in one's determination 2, be fixed with valve guide bushing 8 on the described cylinder head 6, valve guide bushing 8 is provided with valve oil seal 9, the bottom of cylinder head 6 is provided with valve 3, valve 3 is provided with valve spring 7, the upper end of described valve spring 7 compresses by the iron core 2 that is fixed on the valve 3, and valve spring 7 lower ends then are fixed on the bottom of valve lift control electromagnetic valve 1; Described valve lift control electromagnetic valve 1 is located at the top of cylinder head 6, valve lift control electromagnetic valve 1 shell is provided with valve lift sensor 5, valve lift sensor 5 is by the inner ground connection of engine computer, valve lift control electromagnetic valve 1 inside is provided with electromagnetic coil 4, one end of electromagnetic coil 4 is connected the positive terminal through ignition switch control, and the other end of electromagnetic coil 4 is by engine control computer ground connection; The power supply of valve lift sensor 5 is an output+5V voltage after the engine computer voltage stabilizing, and each valve lift signal of sensor all is to pass to engine computer through a signal line separately.

Engine computer according to current engine load, speed of crankshaft and position, suction pressure etc. and engine computer storage inside data relatively after, determine a control electric current and the time that basic valve opening is required, the time that the control valve is opened and the size of aperture, revise the time of unlatching and the size of aperture according to signal and intake temperature, the engine temperature of valve production sensor feedback again, can make motor obtain maximum at most.

Internal-combustion engine electronic control distribution timing mechanism of the present invention, can cancel parts in the petrol engine ERG system (exhaust gas recirculation) as the EGR solenoid valve, EGR carries out valve and pipeline thereof, engine computer is according to current load, rotating speed, signals such as engine temperature are determined, egr system work controls then that engine intake valve is opened (before exhaust stroke stops) in advance and the overlapping angle that (at intake stroke time) controls inlet and exhaust valve is closed in the exhaust valve hysteresis if desired, can realize the EGR function, part waste gas in the exhaust is directly entered in the cylinder through exhaust valve to be mixed with combustion gas, to reach the purpose that reduces combustion temperature, also can effectively reduce the content of harmful substance in the waste gas (oxynitrides).

Under the situation that does not increase any mechanical part, the present invention can increase the anti-dragged brake ability of motor, reduce the wearing and tearing of brake block, particularly vehicle can reduce the wearing and tearing of brake block greatly when urban district and following abrupt slope, because computer is worked as preload and vehicle speed according to motor, when engine computer is determined the current engine output power that do not need, and when needing braking, engine computer is when descent of piston, the control intake valve is opened, exhaust valve all cuts out moving 360 ° of all pistons of bent axle revolution and all brakes once (the then cut-out fuel delivery of fuel-cut is arranged) when controlling when piston stroking upward, and the braking of present vehicle exhaust all is installed in the gas exhaust piping, because the mounting point has determined that its sealability can be too not high, and be that 720 ° of all pistons of bent axle revolution are just braked once, the exhaust brake effect is more than 2 times of common exhaust and brake system, has reduced the wearing and tearing of brake block greatly, can improve the driving safety of vehicle when descending the abrupt slope especially.

When not needing vehicle to stop rapidly in some cases, can allow vehicle slide, intake valve was opened when engine computer was according to descent of piston in sliding, the control exhaust valve is opened when up, the running resistance of motor is declined to a great extent slide realizing, sliding only needs with anti-dragged brake that conversion can realize to the engine computer output mode; For multicylinder engine, when the output power of motor does not need when too big, may command part cylinder is not worked, to reduce oil consumption, and during the disconnected cylinder of the common motor that has a disconnected cylinder function, piston compresses gas in the jar (because of disconnected cylinder time inlet and exhaust valve all close) all the time, therefore a large amount of engine powers have been consumed, and the cylinder that is cut off fuel oil is always fixing, this uniform wear to motor is disadvantageous, and the present invention is when breaking cylinder, the engine computer may command is cut off the intake valve of cylinder fuel oil and opens when descent of piston, closes when up, and exhaust valve then reduces the moving resistance that changes on the contrary, and the cylinder that is cut off fuel oil is variation capable of circulation, balanced cylinder, the wearing and tearing of parts such as piston.

Common quartastroke engine, after the physical dimension of bent axle camshaft is determined, the power order is mainly by bent axle and camshaft decision, bent axle all has the possible of acting from 0 °～360 ° every cylinders theoretically, and the quartastroke engine of common camshaft must just can both do work once from 0 °～720 ° every cylinders by bent axle; Therefore after adopting the present invention, after a quartastroke engine is succeeded in developing, can test of the influence of multiple different acting order, once determine best acting order to this internal-combustion engine, the program that only need change engine computer inside can realize, helps the research and development of motor like this.

The present invention has cancelled numerous mechanical parts, makes the mechanical realization of internal-combustion engine simple many, no longer needs to have considered the initial position of bent axle in the motor assembling with in repairing, and does not also need to adjust valve, can turn round as long as system just normally assembles.

Claims

1, a kind of four-stroke internal combustion engine distribution timing mechanism, comprise cylinder head (6), valve lift sensor (5), valve lift control electromagnetic valve (1) and iron core (2), it is characterized in that: be fixed with valve guide bushing (8) on the described cylinder head (6), valve guide bushing (8) is provided with valve oil seal (9), the bottom of cylinder head (6) is provided with valve (3), valve (3) is provided with valve spring (7), the upper end of described valve spring (7) compresses by the iron core (2) that is fixed on the valve (3), and valve spring (7) lower end then is fixed on the bottom of valve lift control electromagnetic valve (1); Described valve lift control electromagnetic valve (1) is located at the top of cylinder head (6), valve lift control electromagnetic valve (1) shell is provided with valve lift sensor (5), valve lift control electromagnetic valve (1) inside is provided with electromagnetic coil (4), one end of electromagnetic coil (4) is connected the positive terminal through ignition switch control, and the other end of electromagnetic coil (4) is by engine control computer ground connection.