CN202707234U - Modified gas engine of forklift diesel engine - Google Patents

Abstract

A modified gas engine of a forklift diesel engine comprises a diesel engine body, a diesel engine piston, a diesel engine cylinder cover, a spark plug and an ignition coil. The modified gas engine is characterized by further comprising a set of gas fuel supply systems. The center of the diesel engine cylinder cover is provided with a longitudinal non-through hole which is straight-bowl-shaped or U-shaped. A thread oil sprayer hole is arranged in the diesel engine cylinder cover in a processed mode. The spark plug and the ignition coil are installed in the thread oil sprayer hole of the diesel engine cylinder cover.

Description

A kind of gas engine of fork truck diesel engine repacking

Technical field

The invention belongs to technical field of engines, relate to the thorough change of forklift engine fuel supply system.The diesel engine of original maximum discharge is transform as the gas engine of low emission electric-controlled type.

Background technique

At present, generally understanding is that diesel engine is the compression ignite technology, and gas engine is a combustion technology, and the application technology of two kinds of products is fully not replaceable.And the invention solves a kind of outlet of these diesel engine maximum discharge enterprises, this diesel engine is changed to actual controllable electronic control type gas engine, further be research and development and the popularization (gasoline and LPG, gasoline and CNG, gasoline and LNG etc.) that can realize duel fuel engine, the state-run enterprise of suitable especially those old types, agricultural, Diesel Engines for Construction Machinery company product up-gradation transformation have extremely important commercial value.Simultaneously, according to (British Petroleum) company of British Petroleum Company statistics in 1999, the existing explored gas reserves in the whole world is approximately 145,000,000,000,000 M3, is 1,366 hundred million tons of equivalent oil in other words.Just say on the heat energy that gas storage is close to oil reserve (oil reserve is 1,410 hundred million tons).According to the demand status of world's rock gas in 2000 and oil, rock gas also enough 63 years, oil also enough 41 years.Therefore, the important function of rock gas on the global energy deposit is self-evident.If nearly decades can be rock gas as automotive fuel, the source that will greatly widen the stable automobile power energy is to prevent the deficiency of liquid fuel.

Summary of the invention

The purpose of this utility model provides a kind of gas engine of fork truck diesel engine repacking.

A kind of gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Be processed with the helical oil injector hole on the described diesel engine cylinder cover, described spark plug and spark coil are installed in the helical oil injector hole of described diesel engine cylinder cover.

Preferably, comprise proportional mixer or gas injection rail in the described fuel gas supply system.

Preferably, also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

According to another program of the present utility model, also provide a kind of gas engine of fork truck diesel engine repacking:

A kind of gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Described diesel engine cylinder cover has boring, embeds the threaded copper sheathing of tool in the cylinder cap boring of non-integral type diesel engine, and described spark plug and spark coil are installed in the threaded copper sheathing of described tool.

Preferably, comprise proportional mixer or gas injection rail in the described fuel gas supply system.

Preferably, also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

The utility model has been broken under the prior art form, diesel engine and gas engine can not be flexible traditional theory, simultaneously under the background of diesel oil famine, the diesel oil of engineering fork truck changes the particularly important of gas, also be practicable, for example: the diesel engine of Forklift Industry changes to gas engine, then diesel engine price of being sold to fork truck main engine factory is about 6800RMB, and the product price of the diesel oil emission control technique of a cover state four directions case is more than 20000RMB, substantially be 3 times of diesel engine body, seriously influence the sale of low-emission diesel; The technology spending that diesel engine changes gas engine spends diesel engine enterprise not quite, totally increases cost and decides according to emission request.If realize that diesel oil changes gas engine, state-two's emission request concerning them, increases cost about 7000RMB.

Therefore, compared with prior art advantage is as follows:

1, the energy-saving and emission-reduction policy that meets country reduces the discharging of carbon granule thing, and is favourable to environmental protection; 2, compare the not high and technology simple possible of the cost of fuel gas electric spray with other diesel oil control techniques; 3, power is large: the gas engine motor that adopts the diesel engine renovation technique to form, and power and moment of torsion have acted on Diesel's characteristic, and power character is not less than the diesel engine of homotype behind the engine reformation, is more suitable for the user of the large power of demand; 4, the life-span is long: the lubrication state that is conducive to improve motor.Few carbon distribution during because of burning, lubricating status can prolong well the working life of motor more than one times, and prolonged the service time of machine oil, reduces the maintenance cost of motor; 5, noise is low: because compression ratio reduces, be difficult for phenomenon of detonation occurs, can obviously reduce the noise of diesel engine; 6, diesel oil is waste: can thoroughly solve the problem of diesel oil famine, make the better free Chinese logistics circle use that is of this logistics equipment of fork truck.

Description of drawings

Fig. 1 is a kind of profile of diesel fork lift trucks motor;

Fig. 2 is the profile of the LPG fork lift truck motor behind the diesel fork lift trucks engine reformation shown in Figure 1, has shown the Transform Type design part of engine body;

Fig. 3 is the profile of the LPG fork lift truck motor behind the diesel fork lift trucks engine reformation shown in Figure 1, has shown the constituent element of electronic engine management system;

Fig. 4 is the cylinder lid for gas engine schematic representation that remodeling installs spark plug additional on the diesel oil cylinder cap basis

Fig. 5 is the sectional view of former diesel engine piston;

Fig. 6 for form afterwards according to the diesel engine piston transformation of a kind of mode of execution of the present utility model the sectional view of gas engine piston.

Number description:

Cylinder cover 1, spark-plug hole 2, former diesel oil piston 3, diesel oil cylinder cap 4, diesel oil high pressure nozzle 5, diesel oil high pressure fuel pump 6, diesel engine (improved gas engine) 7, gas burning system (premixing mode) 8, gas piston 9, combustion gas cylinder cap 10, diesel oil high pressure fuel pump plug 11, engine computer 12, E-Gas 13 (cable control being changed to the signal source of CAN bus arrangement), engine wiring harness 14, gas ignition spark plug 15, another E-Gas (control engine rotating speed and valve opening) 16, water temperature induction plug 17, speed probe 18, signal panel 19, high voltage wire 20.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail, can implements according to this with reference to the specification literal to make those skilled in the art.

The utility model provides a kind of gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Be processed with the helical oil injector hole on the described diesel engine cylinder cover, described spark plug and spark coil are installed in the helical oil injector hole of described diesel engine cylinder cover.

Supply system to diesel engine is transformed, and removes former diesel oil supply system, installs a cover fuel gas supply system additional; Piston central openings at diesel engine, namely begin milled holes along the piston rod direction from piston head, always milling to piston rod away from till near the end of piston head, finally the piston central authorities at diesel engine form vertical non-through hole, wherein said non-through hole be shaped as U-shaped or straight mouthful of bowl type; Cylinder cap to diesel engine is transformed, and the oil injector hole on the cylinder cap of diesel engine is carried out reaming, processes screw thread after the reaming to form spark-plug hole, and spark plug and spark coil are installed in spark-plug hole;

Wherein, the volume of the non-through hole that the piston of described diesel engine central authorities form meets the following conditions: the volume of final non-through hole and former diesel combustion chamber volume sum are the combustion chamber volume of the gas engine transformed out, the cylinder total volume of former diesel engine and the ratio of the combustion chamber volume of the gas engine of transforming out should satisfy the compression ratio range of gas engine, i.e. known former Diesel Engine Parameters:

Cylinder diameter D piston stroke l compression ratio ε

1. former diesel engine, piston are during to lower dead center, and single combustion chamber of air cylinder volume is V ₁

Piston is during to top dead center, and single combustion chamber of air cylinder volume is V ₂

$\frac{V_1}{{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2}=\mathrm{\&epsiv;}$

$V_1-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=\frac{\mathrm{\&pi;}{D}^2\mathrm{<figure-callout\; id="4"\; label="l"\; filenames="HSA00000633805000011.png"\; state="\{\{state\}\}">l</figure-callout>}}{4}$

Then ${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=\frac{\mathrm{\&pi;}{D}^{2}l}{4(\mathrm{\&epsiv;}-1)}$

2. behind the piston remodeling, new compression ratio is ε ' (compression ratio diminishes)

When piston arrived lower dead center, single combustion chamber of air cylinder volume was V ₁'

When piston arrived lower dead center, single combustion chamber of air cylinder volume was V ₂'

$\frac{{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_1^{\&prime;}}{{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2^{\&prime;}}={\mathrm{\&epsiv;}}^{\&prime;}$

${\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_1^{\&prime;}-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2^{\&prime;}=\frac{\mathrm{\&pi;}{D}^2\mathrm{<figure-callout\; id="4"\; label="l"\; filenames="HSA00000633805000011.png"\; state="\{\{state\}\}">l</figure-callout>}}{4}$

Then ${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2^{\&prime;}=\frac{\mathrm{\&pi;}{D}^{2}l}{4({\mathrm{\&epsiv;}}^{\&prime;}-1)}$

Then piston combustion hole volume-variation is:

$\mathrm{\&Delta;V}={\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2^{\&prime;}-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000633805000041.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=\frac{\mathrm{\&pi;}{D}^{2}l}{4}(\frac{1}{{\mathrm{\&epsiv;}}^{\&prime;}-1}-\frac{1}{\mathrm{\&epsiv;}-1})$

3. measuring former diesel engine piston flare pit volume is V ₀

Then newly piston combustion hole volume should be: V ₀' V ₀+ Δ V.

As shown in Figure 1, Fig. 1 is a kind of profile of diesel fork lift trucks motor.In Fig. 1, the piston head of the diesel oil piston 3 of diesel engine 7 is that ω type, shallow basin type, ball-type, u-shaped are recessed, diesel oil cylinder cap 4 is arranged on the top of cylinder body, diesel oil high pressure nozzle 5 is arranged on the diesel oil cylinder cap 4, and diesel oil high pressure fuel pump 6 is arranged in the cylinder block, is the important component part of diesel oil supply system.

As shown in Figure 2, Fig. 2 is the profile of the LPG fork lift truck motor behind the diesel fork lift trucks engine reformation shown in Figure 1, has shown the Transform Type design part of engine body.In Fig. 2, fuel gas supply system (premixing mode) 8 is installed, namely the gas ignition system in the cylinder head of diesel engine (improved gas engine) 7; Diesel engine cylinder cover 4 is removed oil nozzle and is changed to spark-plug hole, thus the cylinder lid for gas engine of transforming out 10; Gas engine piston 9 is to transform on the basis of former diesel engine piston 3, particularly exactly the recessed degree of depth is strengthened at former diesel engine piston top, and the ω type of original diesel engine, shallow basin type, ball-type etc. are all changed to straight mouthful of bowl type or U-shaped; Remove diesel oil high pressure fuel pump 6.

As shown in Figure 3, Fig. 3 is the profile of the LPG fork lift truck motor behind the diesel fork lift trucks engine reformation shown in Figure 1, has shown the constituent element of gas engine electronic control system.Engine computer 12 among Fig. 3 is used for the electronics of control engine, and links to each other with E-Gas 13, and E-Gas 13 changes to cable control the signal source of CAN bus arrangement.Engine wiring harness 14 couples together all parts.Gas ignition is arranged on the cylinder head with spark plug 15.Another E-Gas (control engine rotating speed and valve opening) 16 is used for control engine rotating speed and valve opening; Water temperature induction plug 17 is used for measuring.Also comprise speed probe 18, signal panel 19 and high voltage wire 20 in the electronic control system.

Comprise proportional mixer or gas injection rail in the described fuel gas supply system.

Also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

According to another program of the present utility model, also provide a kind of gas engine of fork truck diesel engine repacking:

A kind of gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Described diesel engine cylinder cover has boring, embeds the threaded copper sheathing of tool in the cylinder cap boring of non-integral type diesel engine, and described spark plug and spark coil are installed in the threaded copper sheathing of described tool.

Preferably, comprise proportional mixer or gas injection rail in the described fuel gas supply system.

Preferably, also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

Cylinder cap to diesel engine is transformed, and in the cylinder cap boring of diesel engine, embeds the threaded copper sheathing of tool in the cylinder cap boring in the non-integral type diesel engine, to form spark-plug hole, spark plug and spark coil is installed in spark-plug hole; As shown in Figure 4, installed spark-plug hole 2 additional on the cylinder cover 1.

Wherein, the volume of the non-through hole that the piston of described diesel engine central authorities form meets the following conditions: the volume of final non-through hole and former diesel combustion chamber volume sum are the combustion chamber volume of the gas engine transformed out, and the cylinder total volume of former diesel engine and the ratio of the combustion chamber volume of the gas engine of transforming out should satisfy the compression ratio range of gas engine.

To the transformation of diesel engine piston as shown in Figure 5 and Figure 6, Fig. 5 is the sectional view of former diesel engine piston; Fig. 6 for form afterwards according to the diesel engine piston transformation of a kind of mode of execution of the present utility model the sectional view of gas engine piston.

The structure of the utility model product is comprised of 3 major parts: body is transformed part; Gas common rail system; Automatically controlled and ignition system.The diesel engine body is made an amendment, the spark plug replacement is installed in former diesel fuel nozzle position, and change piston, reduction compression ratio, more suitable combustion gas work; Then, install a cover gas supply system additional; At last, the igniting and the control strategy system that need the automatically controlled ECU of a cover.Like this, a diesel engine is with regard to the EFI gas engine of change for an advanced person.

On principle, fuel injects different, and gas engine is to adopt the premixing form, sucks the mixture of combustion gas and air from intake manifold; Diesel engine then is that the mode of directly spraying enters engine body, the just air that intake manifold sucks;

Therefore, reinvent according to the demand of gas engine for the structural principle of diesel engine, the enforcement principle of diesel oil changes gas scheme that Here it is, the control system basic circuit diagram of automatical control system is seen figure four.

The scheme of implementation design development and technique step play as follows:

Diesel engine transform the EFI gas engine as, the design of its concrete structure scheme is changed and is comprised that the former diesel oil cylinder cap of Transform Type design is that combustion gas cylinder cap (referring to figure four), change diesel oil piston (the cylinder cap bottom surface is flat, piston head recessed (ω type, shallow basin type, ball-type, u-shaped)) are gas piston (referring to figure five); Increase simultaneously gas supply system, ECU automatical control system, spark plug, high voltage wire, spark coil etc.

Implementation is as follows: remove former diesel engine piston, change to the gas engine piston, purpose is to reduce compression ratio, more suitable combustion gas work.The compression ratio of diesel oil is 16～24, but combustion gas generally only has 7～13, so compression ratio must descend.But the diesel combustion chamber is greatly different from combustion gas, is straight mouthful of bowl type or U-shaped in order to realize the purpose of combustion chamber volume increase, only to dig on the basis of former diesel oil piston being whittled into.The design matching principle of gas piston is: realize faster and burn more fully, shorten flame travel to reduce tendency to detonate.

The design of compression ratio is of paramount importance in all hardware designs, general scheme is the difference of the character according to combustion gas: LPG, CNG, biogas, benchmark of proposal plan, then around the many groups of reference value design even tens groups of compression ratios, check at engine dynamometer successively, under the condition of the same race, the compression ratio of the highest power, minimum row's temperature is defined as the last configuration of bare machine.

Remove former diesel engine cylinder cover, change is equipped with the combustion gas cylinder cap of spark plug, and spark plug generally is contained in former diesel fuel nozzle position, and purpose is can electronic ignition.Common practices is to utilize former diesel oil cylinder cap, changes former oil injector hole into spark-plug hole by reaming, machining screw, and spark plug and spark coil are installed; If the oil sprayer mouth is not integral structure, need design in cylinder cap edge copper sheathing structure, the combustion gas spark plug is installed, so just change to the Spark ignition type structure.If screw thread is installed in just directly processing of integral structure.

Install a cover gas burning system when removing former diesel oil supply system additional, comprise proportional mixer or gas injection rail for accurate adjustment fuel.

Install separately the gas ignition system of a cover EFI additional, comprise the ECU with the OBD function, be used for control and the control exhaust emissions of the interior fuel gas injection amount of machine of motor.

More change engine oil bleeds off original bavin machine oil, is replaced by the combustion gas special engine oil.

At last, carry out targetedly the ECU computer of every engine pedestal overall performance and demarcate, program step is played as follows:

Startability demarcation, idling and high altitude vehicle rotating speed are demarcated, estimated value demarcates that (intake temperature, cylinder head temperature and exhaust back pressure etc.), charging efficiency table demarcate that (all operating point charging efficiencies), external characteristic curve are demarcated, Economy is demarcated (mixture strength and ignition advance angle), demarcations of fuel control open loop table, speed governing demarcation, transient state are demarcated, (mixture strength and ignition advance angle), fault demarcation are demarcated in discharging.After having finished relevant complete vehicle test, finally could be with product marketization.

Claims (6)

1. the gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Be processed with the helical oil injector hole on the described diesel engine cylinder cover, described spark plug and spark coil are installed in the helical oil injector hole of described diesel engine cylinder cover.

2. the gas engine of a kind of fork truck diesel engine repacking as claimed in claim 1 is characterized in that, comprises proportional mixer or gas injection rail in the described fuel gas supply system.

3. the gas engine of a kind of fork truck diesel engine repacking as claimed in claim 1 or 2 is characterized in that, also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

4. the gas engine of fork truck diesel engine repacking, comprise diesel engine, diesel motor piston, diesel engine cylinder cover, spark plug and spark coil, it is characterized in that, also comprise a cover fuel gas supply system, there is vertical non-through hole in described diesel motor piston central authorities, wherein said non-through hole be shaped as straight mouthful of bowl type or U-shaped; Described diesel engine cylinder cover has boring, embeds the threaded copper sheathing of tool in the cylinder cap boring of non-integral type diesel engine, and described spark plug and spark coil are installed in the threaded copper sheathing of described tool.

5. the gas engine of a kind of fork truck diesel engine repacking as claimed in claim 4 is characterized in that, comprises proportional mixer or gas injection rail in the described fuel gas supply system.

6. such as the gas engine of claim 4 or 5 described a kind of fork truck diesel engine repackings, it is characterized in that, also comprise the automatically controlled gas ignition system of an independent cover that installs additional, comprise the automobile specified single-chip microcomputer ECU with On-Board Diagnostics (OBD) OBD function in the described automatically controlled gas ignition system; Described automatically controlled gas ignition system is installed in the former diesel engine cylinder cover, and removes former diesel oil supply system, comprises the diesel oil high pressure fuel pump that removes former diesel engine.

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