CN204738853U - Engine decompression controlling means - Google Patents

Abstract

The utility model discloses an engine decompression controlling means sets up in an engine that has a cylinder head, lift a pole and a control unit including an electric motor, a decompression axle, a decompression. The decompression axle is including being equipped with a buffering portion and a main shaft body that reduces pressure the axle spring, and this main shaft body has a bulge and a concave spout that contracts. The pole is lifted in the decompression, and wear to locate in the vertical channel of camshaft and the cover is equipped with a decompression and lifts the pole spring, and the other top of front and back end part that the pole was lifted in the decompression pushes away the main shaft body and an exhaust rocking arm. Electric motor is connected to the the control unit electricity for control electric motor drive control crown of roll pushes away or retracts the control push rod. Consequently, in engine pressure stroke, this device of accessible reduces pressure, reduces engine bent axle resistance, improves the smooth and easy degree of crank up to sharp initiating task.

Description

Engine depressed control device

Technical field

The utility model about a kind of engine depressed control device, espespecially a kind of depressed control device being applicable to locomotive engine system.

Background technique

So-called engine depressed control device, is generally applied to the compression stroke state of engine pistons, refers to Fig. 6, is the graph of a relation of the valve unlatching lift-crankshaft rotation angle of the engine depressed control device of the utility model preferred embodiment.As shown in the figure, ordinate of orthogonal axes represents that lift opened by valve, and transverse axis coordinate represents crankshaft rotation angle.The utility model adopt the working principle of four-stroke engine to distinguish according to the position of cylinder inner carrier movement, therefore the position of a upper dead center (T.D.C) or lower dead centre (B.D.C) is sequentially arrived every 180 degree, and by 0 degree, in each interval, being sequentially divided into power, exhaust, air inlet, compression four working strokes, general valve head curve comprises exhaust head curve A and air inlet head curve B.But, when piston is under compression stroke, and now engine speed too low or start up period time, resistance suffered by bent axle will significantly rise, make to rotate smooth degree deficiency, whole efficiency is affected, and thus needs engine depressed control device to assist pressure release, therefore, the head curve C that reduces pressure as illustrated in the drawing is created.

But existing engine depressed control device refers to shown in Fig. 7, it is the sectional view of existing engine depressed control device.Existing engine pressure-release device is arranged in a cylinder head 91 of an engine 9, system utilizes decompression hoof block 92 interlock one to be arranged at the decompression shaft 93 on camshaft 930 and to reduce pressure and lifts bar 94, this decompression hoof block 92 connects a relief spring 921, utilizes the restoring force of this relief spring 921 as the pointer judging engine critical speed of rotation.Therefore, when engine 9 rotating speed is lower than a certain particular value, the centrifugal force of this decompression hoof block 92 cannot overcome the elastic force of relief spring 921, makes decompression lift bar 94 and protrudes outside the basic circle of exhaust cam, and then let out the part cylinder pressure except outlet valve carries out in compression stroke; Otherwise after engine 9 rotating speed reaches a certain value, the centrifugal force of decompression hoof block 92 overcomes the restoring force of relief spring 921, then start decompression shaft 93 rotates, and decompression is lifted bar 94 and retracted in the basic circle of exhaust cam, will not carry out decompression action, and make engine 9 proper motion.

But, existing engine pressure-release device can carry out decompression rotating speed along with different air displacement, and its demand changes many correlated parts as decompression hoof block, decompression returning spring, decompression equilibrium block, and its decompression rotating speed can only in certain certain value specific.

Model utility content

Main purpose of the present utility model ties up to provides a kind of engine depressed control device, be replace conventional pressure relief hoof block with electric motor, and by control hinge that a control unit starts or stops as decompressor, use and reach and can set decompression state on any opportunity, and power consumpiton and the energy dissipation of starting motor can be reduced, the starting drive of smaller szie can be selected in engine design.

For reaching above-mentioned purpose, the utility model provides a kind of engine depressed control device, is arranged at an engine with a cylinder head, comprises: an electric motor, a decompression shaft, a decompression lift bar and a control unit.Electric motor connects a Control Shaft, can provide a Power output and be passed on Control Shaft.Decompression shaft is arranged in a camshaft, comprise the buffer part and a main shaft that are provided with a decompression shaft spring, buffer part is fixed in camshaft, and main shaft has a bump and a recessed contracting chute, and the rear ends of main shaft connects a control push rod of buffer part and Control Shaft respectively.Therefore, decompression shaft can slippage in the horizontal direction, and by the decompression shaft spring that controls push rod and buffer part with the use of, the position of adjustment residing for decompression shaft.Decompression to be lifted in a vertical passage that bar is arranged in camshaft and is arranged with a decompression and lifts bar spring, and rear ends pushing tow main shaft and an exhaust rocker arm respectively of bar is lifted in decompression.Therefore, bar is lifted in decompression can slippage in vertical direction, and by the decompression in above-mentioned bump or a recessed contracting chute thrusting action and vertical passage lift bar spring with the use of, the position of adjustment decompression act residing for bar.Control unit electrical connection electric motor, in order to control electrical motor driven Control Shaft pushing tow or to retract control push rod.Therefore, control unit controls electric motor, makes above-mentioned decompression shaft and the related correspondence effect of decompression act bar generation, uses and control exhaust rocker arm start unlatching or closedown in compression stroke, can carry out decompression operation accurately in specific rotation speeds.

Wherein, when engine is lower than a desired speed, bar is lifted in the bump pushing tow decompression of decompression shaft, outside the basic circle that making reduces pressure lifts bar to exhaust cam.Now, deserve to be called in the utility model and state decompression shaft and move to a high position, make exhaust rocker arm driven by thrusting action and open outlet valve, carry out decompression operation.

In another case, when engine is higher than a desired speed, the recessed contracting chute of decompression shaft is accepted decompression and is lifted bar, in the basic circle that making reduces pressure lifts bar to exhaust cam.Now, deserve to be called in the utility model and state decompression shaft and move to a lower position, make exhaust rocker arm driven by return action and close outlet valve, do not carry out decompression operation.

Above-mentioned control unit can comprise a motor controller, a rotating speed perceptron and an angular orientation perceptron, and rotating speed perceptron receives the rotary regimes information of engine and electric coupling motor controller.Therefore, in order to detect current rotating speed and crankshaft information, judge whether more than a specific rotation speeds simultaneously, and whether this startup decompression is machine-processed to utilize motor controller to control this electric motor, bent axle can be turned round more smooth and easy, reduce energy dissipation, in order to priming task.

Moreover, one power motor can with a bent axle coaxial rotating of engine, make power motor have motoring mode and generator mode simultaneously, now, power motor is not only just a drive unit, and more can become an electricity generating device, it depends on and engine efficiency, when engine efficiency difference time, auxiliary drive can cause motor power consumption; Otherwise, when engine efficiency is high time, can be used as the role of generator, electric energy recharged in battery, make it to become a high efficiency parallel combined power system.

More than general introduction and ensuing detailed description are all exemplary in nature is to further illustrate claim of the present utility model.And about other object of the present utility model and advantage, set forth in follow-up explanation and diagram.

Accompanying drawing explanation

The sectional view of the start decompression of the engine depressed control device of Fig. 1 system the utility model preferred embodiment.

Another sectional view of the start decompression of the engine depressed control device of Fig. 2 system the utility model preferred embodiment.

The sectional view of the non-start decompression of the engine depressed control device of Fig. 3 system the utility model preferred embodiment.

Another sectional view of the non-start decompression of the engine depressed control device of Fig. 4 system the utility model preferred embodiment.

The schematic diagram of the engine depressed control device of Fig. 5 system another preferred embodiment of the utility model.

The graph of a relation of lift-crankshaft rotation angle opened by the valve of the engine depressed control device of Fig. 6 system the utility model preferred embodiment.

The sectional view of the existing engine depressed control device of Fig. 7 system.

[symbol description]

1 engine 10 power motor

11 cylinder head 2 electric motors

20 output shaft 201 orthogonal screw gear trains

21 Control Shaft 210 shaft ends

211 control push rod 3 decompression shaft

30 camshaft 301 vertical passages

31 buffer part 311 decompression shaft springs

32 main shaft 321 bumps

322 recessed contracting chutes 4 reduce pressure and lift bar

40 exhaust rocker arm 401 outlet valves

Bar spring 5 control unit is lifted in 411 decompressions

6 exhaust cam 7 bent axles

8 battery 9 engines

91 cylinder heads 92 reduce pressure hoof block

921 relief spring 93 decompression shafts

930 camshafts 94 reduce pressure and lift bar

A is vented head curve B air inlet head curve

C reduces pressure head curve

Embodiment

Understand for the ease of persons skilled in the art and realize the utility model, now describing embodiment of the present utility model by reference to the accompanying drawings.

Referring to Fig. 1 and Fig. 2, is sectional view and another sectional view of the start decompression of the engine depressed control device of the utility model preferred embodiment.The visual angle difference 90 degree of two described sectional views, can by difference towards inspecting structure characteristic of the present utility model.Show a kind of engine depressed control device in figure, be arranged at an engine 1 with a cylinder head 11, mainly comprise electric motor 2, decompression shaft 3, decompression and lift bar 4 and a control unit 5.The use of this engine depressed control device is opportunity: when the piston action of engine 1 enters compression stroke, in order to increase the smooth degree of slow-revving crank up, being adjusted, can reduce energy dissipation by the pressure release of automation, promotes engine efficiency.

In the present embodiment, the output shaft 20 of electric motor 2 connects a Control Shaft 21, the Power output of electric motor 2 can be passed on Control Shaft 21.Wherein, in order to avoid motor continues start decompression, cause the problems such as excessive power consumption and motor burn out, therefore between electric motor 2 and Control Shaft 21, orthogonal screw gear train 201 is separately configured with, it possesses self-locking effect, and when electric motor 2 is not energized rotation, Control Shaft 21 cannot return strength and rotate this electric motor 2.One shaft end 210 of described Control Shaft 21 accommodating one can control push rod 211, and utilizes the driving force of electric motor 2 to make it slippage in the horizontal direction.

Then, above-mentioned control push rod 211 connects a decompression shaft 3, and this decompression shaft 3 is arranged in a camshaft 30, comprises buffer part 31 and a main shaft 32, this buffer part 31 to be fixed in camshaft 30 and to be provided with a decompression shaft spring 311, as damping mechanism during main shaft 32 pushing tow.Wherein, main shaft 32 has bump 321 and a recessed contracting chute 322, and both have level difference in the vertical, can in order to switch the location status of an exhaust rocker arm 40.Now, in the vertical passage 301 of camshaft 30, correspondence arranges a decompression and lifts bar 4, and its rear ends is pushing tow main shaft 32 and an exhaust rocker arm 40 respectively, and utilizes a decompression to lift bar spring 411 as damping mechanism during decompression act bar 4 pushing tow.Therefore, lifted the continuous action relation of bar by decompression shaft and decompression, construction goes out a kind of exhaust valve opening mechanism, can set decompression state on any opportunity.In addition, decompression is lifted bar spring 411 and is also possessed suppression decompression act bar centrifugal force when engine height rotating speed, avoids start of reducing pressure.

Except above-mentioned mechanical transmission structure, be separately provided with a control unit 5, be electrical connection electric motor 2, its inside can comprise a motor controller, a rotating speed perceptron and an angular orientation perceptron.Rotating speed perceptron receives the rotary regimes information of engine and electric coupling motor controller; The position information that angular orientation perceptron detecting motor output shaft rotates.Finally, the detecting information that motor controller is comprehensively above-mentioned, sends a signal control electric motor 2 and whether should supply Power output, provide the active force controlling push rod 211 1 pushing tow or retract.Therefore, being different from is utilize the centrifugal force of decompression hoof block and the comparison of spring-return power traditionally, and start decompression shaft rotates, and the utility model passes through control system, effectively simplifies part demand and promotes the sensitivity in decompression judgement.

Therefore, by detecting and the judgement of above-mentioned control unit 5, when engine pistons enter compression stroke and rotating speed lower than a desired speed time, this desired speed can be set as between the interval of 1100 ~ 1200rpm or the composite power rotating speed in power motor pattern, can turn round more smooth and easy to make bent axle, as shown in Figures 1 and 2, the continuous action relation start of said mechanism is utilized to reduce pressure, its final purpose is in order to open and close outlet valve 401, high pressure air physical efficiency in cylinder is discharged in advance, carries out decompression operation.Therefore, when electric motor 2 goes back to Control Shaft 21 to original position, this control push rod 211 is made to get back in the groove of shaft end 210, and utilize the restoring force of decompression shaft spring 311 to drive main shaft 32 slippage to the right, decompression shaft is made to be in a high position, that is bar 4 is lifted in the bump 321 pushing tow decompression of main shaft 32, outside the basic circle that making reduces pressure lifts bar 4 to exhaust cam 6.Finally, exhaust rocker arm 40, by the thrusting action of bump 321, drives outlet valve 401 to open downwards, completes decompression operation.

Relatively, to stop decompression operation, referring to Fig. 3 to Fig. 4, is sectional view and another sectional view of the non-start decompression of the engine depressed control device of the utility model preferred embodiment.Equally by detecting and the judgement of above-mentioned control unit 5, when engine pistons enter compression stroke and rotating speed higher than a desired speed time, this desired speed can be set as between the interval of 1100 ~ 1200rpm or the composite power rotating speed in power motor pattern, because engine and bent axle are in the state of normal high speed rotating, therefore without the need to recycling said mechanism start decompression.Therefore, electric motor 2 rotates Control Shaft 21 and leaves original position, making to control push rod 211 departs from the groove of shaft end 210, and by a buffering compression decompression shaft spring 311, and then drive main shaft 32 slippage left, make decompression shaft be in a lower position, that is, the recessed contracting chute 322 of main shaft 32 is accepted decompression and is lifted bar 4, makes decompression lift bar 4 and returns back in the basic circle of an exhaust cam 6.Finally, exhaust rocker arm 40 acts on by the undertaking of recessed contracting chute 322, and outlet valve 401 is upwards closed, and stops decompression operation.

Moreover engine depressed control device of the present utility model also can be applicable in the vehicle motor of integral type starter-generator (Integrated Starter Generator, ISG) or parallel composite power.Referring to Fig. 5, is the schematic diagram of the engine depressed control device of another preferred embodiment of the utility model.Disclose a kind of configuration mode of parallel composite power vehicle in figure, its configuration feature is: power motor 10 and bent axle 7 coaxial rotating of engine 1, make power motor 10 have motoring mode and generator mode simultaneously.When engine 1 rotating speed is in low speed, control unit 5 considers that engine 1 efficiency is low, therefore drives transmission system rotating tire in a motor mode.And power motor 10 is when rotating, engine 1 can be subject to the impact of engine compression pressure, makes this power motor 10 need more power, causes motor power consumption.Therefore, control unit 5 controls the decompression of decompressor start engine, to reduce battery 8 loss of capacitance; On the other hand, when engine 1 rotating speed is in high speed, because engine 1 efficiency is high, therefore power motor 10 is changed into generator mode not start simultaneously decompression by control unit 5, the kinetic energy produced during effective recovery engine 1 tire on the drive wheels is recharge in battery 8 with the form of electric energy.Now, power motor 10 is not only just a drive unit, and more can become an electricity generating device, it depends on the change with engine efficiency and rotating speed, is a kind of parallel combined power system in conjunction with engine depressed control device.

Although depict the utility model by embodiment, but those of ordinary skill in the art know, when not departing from spirit of the present utility model and essence, the utility model just can be made to have many distortion and change, and scope of the present utility model is limited to the appended claims.

Claims (6)

1. an engine depressed control device, is arranged at an engine with a cylinder head, it is characterized in that, comprising:

One electric motor, it connects a Control Shaft;

One decompression shaft, be arranged in a camshaft, comprise the buffer part and a main shaft that are provided with a decompression shaft spring, this buffer part is fixed in this camshaft, this main shaft has a bump and a recessed contracting chute, and the rear ends of this main shaft connects a control push rod of this buffer part and this Control Shaft respectively;

Bar is lifted in one decompression, and be arranged with a decompression and lift bar spring in the vertical passage being arranged in this camshaft, rear ends this main shaft of pushing tow and an exhaust rocker arm respectively of bar is lifted in this decompression; And

One control unit, it is electrically connected this electric motor, in order to control this Control Shaft pushing tow of this electrical motor driven or to retract this control push rod.

2. engine depressed control device as claimed in claim 1, is characterized in that, when this engine is lower than a desired speed, bar is lifted in this this decompression of bump pushing tow of this decompression shaft, and this decompression is lifted outside the basic circle of bar to exhaust cam.

3. engine depressed control device as claimed in claim 1, is characterized in that, when this engine is higher than a desired speed, the recessed contracting chute of this decompression shaft is accepted this decompression and lifted bar, and this decompression is lifted in the basic circle of bar to exhaust cam.

4. engine depressed control device as claimed in claim 1, it is characterized in that, this control unit comprises a motor controller, a rotating speed perceptron and an angular orientation perceptron, and this rotating speed perceptron receives the rotary regimes information of engine and this motor controller of electric coupling.

5. engine depressed control device as claimed in claim 1, is characterized in that, a bent axle coaxial rotating of a power motor and this engine.

6. engine depressed control device as claimed in claim 5, it is characterized in that, this power motor has motoring mode and generator mode, is a parallel combined power system.