WO2008043323A1 - Diesel engine - Google Patents

Diesel engine Download PDF

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Publication number
WO2008043323A1
WO2008043323A1 PCT/DE2007/001518 DE2007001518W WO2008043323A1 WO 2008043323 A1 WO2008043323 A1 WO 2008043323A1 DE 2007001518 W DE2007001518 W DE 2007001518W WO 2008043323 A1 WO2008043323 A1 WO 2008043323A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
fuel
characterized
engine according
diesel
Prior art date
Application number
PCT/DE2007/001518
Other languages
German (de)
French (fr)
Inventor
Dieter Goldschmitt
Original Assignee
Goldschmitt Techmobil Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE200610048070 priority Critical patent/DE102006048070A1/en
Priority to DE102006048070.8 priority
Application filed by Goldschmitt Techmobil Ag filed Critical Goldschmitt Techmobil Ag
Publication of WO2008043323A1 publication Critical patent/WO2008043323A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/10Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • F02D19/0631Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position by estimation, i.e. without using direct measurements of a corresponding sensor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626Measuring or estimating parameters related to the fuel supply system
    • F02D19/0634Determining a density, viscosity, composition or concentration
    • F02D19/0636Determining a density, viscosity, composition or concentration by estimation, i.e. without using direct measurements of a corresponding sensor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/30Use of alternative fuels
    • Y02T10/36Multiple fuels, e.g. multi fuel engines

Abstract

The invention relates to a diesel engine with cylinders, each cylinder comprising an injection nozzle which is supplied via a fuel line and is used to introduce diesel fuel into the combustion chamber in a dosed manner. A supply line for combustion air and an exhaust line are respectively associated with each cylinder. An insufflation device (20) for gas is also associated with each cylinder, said insufflation device being supplied via a corresponding gas line. The injection of the diesel fuel and the insufflation of the gas mixture are controlled by a regulator (2, 21) to which the power requirement and the engine speed are provided as input quantities.

Description

 diesel engine

The invention relates to a diesel engine with cylinders, in which in each cylinder a supplied via a fuel line injector is installed, whose function is the metered introduction of diesel fuel into the combustion chamber, and each cylinder each a supply line for combustion air and an exhaust gas line assigned.

Notoriously known is the function of the diesel engine, which is essentially characterized by the principle that the injected by sputtering into the combustion chamber diesel fuel undergoes compression to such an extent that heating beyond the ignition point takes place, through which the combustion process is initiated. Essentially unlike petrol engines, the use of a spark plug to initiate the combustion process is not necessary and therefore not intended. As fuel diesel fuels are used and more recently in their stead more and more gas, so that the diesel engine is operated exclusively by the fuel gas. However, in the gas-powered diesel engines, the attachment of a spark plug is required because a self-ignition of the pure gas fuel is not possible. Designating such gas-fueled engines as diesel engines seems to be contrary to the system.

On the one hand, the increasing spread of the use of gas fuels is due to the significant increase in the price of diesel fuel, which has led to the purchase price of gas fuels currently only about 1/3 of that of diesel fuel. On the other hand can be achieved with the fuel gas much cheaper and thus environmentally friendly emissions. The object of the invention has been found to provide a solution by which the operation of a diesel engine using the gas fuel is possible without spark plugs or the same must be used.

The invention is solved by the fact that

- Each cylinder is additionally assigned a blowing device for gas, which is supplied via a corresponding gas line and

- The injection of the diesel fuel and the injection of the gas mixture is controlled by a regulator,

- The power demand and the speed are available as an input variable.

The core idea of the invention is to supply the combustion chamber with a mixture of diesel and gas. The proportion of diesel in this case is as low as possible, but still to choose so high that in the compression self-ignition is triggered. The burning energy is provided mainly by the proportion of the gas fuel. The task of the diesel component consists primarily in the generation of auto-ignition; the energy supply, however, is primarily concerned about the gas content. The supply of the fuels via two conduit systems, wherein the diesel fuel is carried out in a known manner by injection at very high pressures. The supply of the fuel gas is done by blowing with a low pressure compared to the diesel fuel. The supply of both fuels is adjusted by means of a regulator which optimizes the mixture composition as a function of the speed and power requirement. The controller receives its manipulated variable by recording the operating parameters and their evaluation by means of characteristic curves. The control device is of conventional design and for a professional Knowledge of the corresponding characteristic fields easily adjustable.

To perform its function, the controller requires information about the current speed of the motor and the current power requirement. The latter is known to occur in motor vehicles on the detection of the position of the accelerator pedal. This information is necessary and can be supplemented by further information for optimization, as explained in detail later. The advantages attainable with the present invention are considerable in several respects. First, one recognizes as a significant advantage that you can dispense with the installation of spark plugs despite the use of the fuel gas. This decisive advantage is particularly evident when it comes to the need or desire to retrofit existing diesel engines. Due to the fact that the energy is provided by the fuel gas, the operation of the diesel engine is much cheaper, after the market price for gas is currently only about 1/3 of that for diesel fuel. Another key advantage is the significant improvement in emissions. This is a decisive advantage with regard to the tendency to exacerbate the exhaust gas values due to increasing pollutant pollution among legislators. The technical background to this is that gas burns virtually residue-free and thus the proportion supplied by the diesel fuel to the exhaust gases is much lower, so that results in a more environmentally friendly value for the entire exhaust gas. Another advantage is that the unwanted NO x components are greatly reduced in the existing fuel mixture. In a special embodiment of the invention, it is provided to adjust the proportion of diesel to 20-40% (more precisely = volume percent) of the total fuel mixture. This mixture ratio has in view of the fact that the demand for auto-ignition requires the highest possible proportion of diesel fuel and, in contrast, requires the demand for reducing the consumption costs for the highest possible proportion of gas, as the optimum operating range.

In the usual for the control of injectors in diesel engines control devices not only the power requirements and the instantaneous speed of the engine are detected to optimize the combustion process in an advantageous manner, but also the temperature of the engine and the sucked air, the boost pressure as well as the phase measured.

Similarly, to set the amount of gas to be injected in addition to the power requirement and the speed additionally recommended gas temperature, the temperature of the charge air and the exhaust gas to capture and use to optimize the operating conditions.

To optimize the ratio of air and fuel, a lambda probe is used in the prior art. It sits in the exhaust pipe and detects the content of the remaining oxygen in the exhaust gas pipe

Exhaust gas, which is done by comparing the oxygen content of the exhaust gas with a reference value, which usually supplies the ambient air. The composition of the exhaust gas or of the oxygen contained therein is essentially determined by the mixture of air and fuel supplied to the combustion chambers. Diesel engines always run with high air This results in lambda values from well over 1 to lambda = 2. The power or torque of the diesel engine is determined by the injected amount of diesel. For gasoline engines, on the other hand, the intake air volume is the basis of the power. In the ideal case, the stoichiometric composition of air and fuel in the combustion chamber is lambda = 1. With a higher lambda value, the ignitability decreases and the exhaust gas values increase. In the dual-fuel operation according to the invention (diesel / natural gas), a lambda value from the intermediate range is targeted, that is, for example, a lambda value about 1, 2. The lambda probe is an effective means available to those skilled in the art to optimize the composition of the fuel and air mixture supplied to the combustion.

In a preferred embodiment, in addition to the control of the supply of fuel and the amount of combustion air supplied by the control unit adjustable. For this purpose, a throttle valve is arranged in the channel of the air supply, the position of which is controllable and adjustable via the control device. The throttle valve allows the amount of air supplied to throttle and thereby optimize the combustion process. In the dual-fuel operation (diesel / gas) according to the invention, the amount of air and combustion air used can therefore be adapted to the respective performance and driving situations. The position of the throttle valve is adjusted via the control unit. This provides a further parameter that offers significant benefits in optimizing combustion and achieving superior exhaust gas compositions. In particular, the proportion of NOx can be influenced advantageously by the amount of air supplied, especially in the low speed range. In the case of high excess air, ie under conditions of lean combustion, high heat is produced in the combustion chamber, which results in an increase in the toxic NOχ content in the exhaust gas. To counteract this, the invention proposes that a part of the exhaust gas be recirculated and admixed with the combustion air. The

The result is a reduction of the O 2 content and consequently a reduction of the combustion temperature and, as a desired result, the reduction of the NO x values.

In a further development, it is proposed to adjust the proportion of the recirculated exhaust gas or the exhaust gas portion supplied to the combustion air differently and to activate it, in particular in the lower and middle speed range. The lower the speed, the higher the proportion of exhaust gas added to the combustion air. In appropriate operating situations, the proportion of exhaust gas in the supplied combustion air can be up to 50%.

In an expedient development, it is proposed to achieve the goal of reducing the combustion temperature by cooling the recirculated exhaust gas. A colder combustion reduces the ejected NOχ values.

Further details, features and advantages of the inventive concept can be found in the following description part, in which an embodiment of the invention is explained in more detail with reference to the drawing.

It shows as a schematic block diagram the structure of a motor according to the invention with the corresponding supply lines. The drawing is subdivided into two halves for clarity, by a vertical and dashed line, of which the left one is denoted by the letter A, indicating the supply and supply of the diesel fuel and the right half with B, with the processing and feeding of the fuel gas deal.

The features shown in the left half A are the same as the conventional diesel engines. The here not reproduced cylinders (here: 4) is one each

Injector 1 assigned. Each of these nozzles 1 is controlled by the controller 2 and supplied via a fuel line with diesel. Via a fuel pump 4, the fuel is provided with a distributor 5. In the drawing, a pressure sensor and a pressure relief valve are shown. The pump 4 is supplied in a known manner via a fuel tank 6 with diesel. Although the low-pressure pump 7 serving for the promotion, the fuel filter 8 as well as the return line connected to the distributor 5 via the pressure-limiting valve and also the power supply of the regulator 2 are shown, they are of secondary interest for the understanding of the principle according to the invention. The controller 2 receives information about sensors, by which the rotational speed (rotational speed sensor 9), the phase (phase sensor 10), the power requirement via the pedal travel sensor 11, the boost pressure via the boost pressure sensor 12, the air temperature (air temperature sensor 13) and the engine temperature (engine temperature sensor 14 ) and made available. These measurements serve to determine the quantity and time of the diesel fuel to be injected. Not least because the structure is of the usual kind, the sketch for the average expert is self-explanatory, so that further explanations can be omitted. In the right half of the image B, the supply of the fuel gas is shown in detail.

Again, each one, not shown in the representation cylinder each assigned a blowing device 20. Their control takes place via a controller 21, which is supplied with the measured values of the sensors of speed, phase, pedal travel, charge pressure and temperature of air and engine (sensors 9-14). Further information is provided by the sensor via the EGR (exhaust gas recirculation) valve 23, the throttle valve 24 in the charge air flow and the intake temperature of the gas (intake temperature sensor 25), the temperature of the charge air (charge air temperature sensor 26) and finally the exhaust gas temperature (exhaust gas temperature sensor 27). All the information serves to optimally quantify the amount of gas to be supplied to each of the injectors 20 in an optimal manner. Finally, the gas supply regulator 21 just described is in communication with the diesel fuel regulator 2, so that it is possible to speak of a single regulator serving both fuel circuits.

As a reservoir for the fuel gas, a gas cylinder 28 is located. From there, the gas reaches the pressure reducer 29, from where it supplies the blowing devices 21 with gas via a line. The pressure reducer 29 is adjustable and switchable via a solenoid valve. These elements, as well as arranged in the gas bottle valves (check valve, NGV 1 valve) for the description of the function of the invention is not essential and should therefore be omitted for reasons of clarity.

The function is as follows: Each injector 20 is supplied via the gas cylinder 28 by means of pressure reducer 29 with gas. The circuit of the injection device 20, however, is done via the controller 21, which in turn has plenty of information that allow him an optimal dosing of the fuel gas.

It should be clarified that the injection nozzles 1 and the blowing devices 20 are assigned to one and the same cylinder in pairs. According to the proposal according to the invention, each cylinder is equipped on the one hand with an injection nozzle 1 and with a blowing device 20, so that as a result a mixture of diesel and gas is introduced into the combustion chamber.

The result is a diesel engine that has significant advantages in terms of operating costs and emissions.

LIST OF REFERENCE NUMBERS

1 injector

2 controllers

3 fuel line

4 fuel pump

5 distributors

6 fuel tanks

7 low-pressure pump

8 fuel filters

9 speed sensor

10 phase sensor

11 pedal travel sensor

12 boost pressure sensor

13 air temperature sensor

14 engine temperature sensor

20 blowing device

21 gas regulator

22 lambda

23 EGR valve

24 throttle valve sensor

25 outlet temperature sensor

26 Charge air sensor

27 Exhaust gas temperature sensor

28 gas bottle

29 pressure reducer

Claims

claims
1. Diesel engine with cylinders, in which in each cylinder a fuel line supplied via an injector 1 is installed, the
Function in the metered introduction of diesel fuel into the combustion chamber, and each cylinder is associated with a respective supply line for combustion air and an exhaust pipe, characterized in that
- Each cylinder is additionally assigned a blowing device 20 for gas, which is supplied via a corresponding gas line and
- injection of diesel fuel and injection of diesel fuel
Gas mixture is controlled by a regulator 2, 21,
- The power demand and the speed are available as an input variable.
2. Engine according to claim 1, characterized in that the proportion of diesel fuel to the entire fuel mixture
20 - 40%.
3. Engine according to one of the preceding claims, characterized in that to determine the supplied amount of diesel fuel, the temperature of the engine and / or intake air and / or boost pressure and / or the phase are measured and made available to the controller.
4. Engine according to one of the preceding claims, characterized in that detected to determine the amount of fuel to be supplied gas, the temperature of the gas and / or the charge air and / or the intake air and / or the exhaust gas and the controller 21 are available is provided.
5. Engine according to one of the preceding claims, characterized in that in the exhaust stream, a lambda probe is arranged, the measured values supplied to the controller and used in the adjustment of the mixture composition.
6. Engine according to one of the preceding claims, characterized in that in the feed channel of the combustion air, an adjustable throttle valve is arranged, the setting is optimized by the controller.
7. Engine according to one of the preceding claims, characterized in that the exhaust gas is partly recycled and the combustion air is mixed.
8. Engine according to claim 7, characterized in that a
Return of the exhaust gas in the lower and middle speed range takes place.
9. Engine according to the preceding claim 7 or 8, characterized in that, in the exhaust gas recirculation, a cooling is performed.
PCT/DE2007/001518 2006-09-15 2007-08-25 Diesel engine WO2008043323A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200610048070 DE102006048070A1 (en) 2006-09-15 2006-10-11 Diesel engine has cylinders, which are assigned with blowing device for gas, where blowing device is supplied with appropriate gas line
DE102006048070.8 2006-10-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200711002649 DE112007002649A5 (en) 2006-10-11 2007-08-25 Diesel engine

Publications (1)

Publication Number Publication Date
WO2008043323A1 true WO2008043323A1 (en) 2008-04-17

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ID=38846772

Family Applications (1)

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PCT/DE2007/001518 WO2008043323A1 (en) 2006-09-15 2007-08-25 Diesel engine

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DE (1) DE112007002649A5 (en)
WO (1) WO2008043323A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090968A1 (en) * 2009-06-03 2010-12-04 Landi Renzo Spa Method and device for feeding a diesel engine with dual fuel
EP2628922A1 (en) * 2012-02-16 2013-08-21 MAN Truck & Bus AG Method for operating a self-igniting combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250260B1 (en) * 1998-10-13 2001-06-26 Jason E. Green Bi-fuel control system and assembly for reciprocating diesel engine powered electric generators
WO2001059280A1 (en) * 2000-02-11 2001-08-16 Westport Research Inc. Method and apparatus for dual fuel injection into an internal combustion engine
US20040149255A1 (en) * 2000-05-08 2004-08-05 Cummins Inc. Multiple operating mode engine and method of operation
EP1632665A1 (en) * 2004-09-03 2006-03-08 Infineum International Limited A method for improving the power output of a dual-fuel gas engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250260B1 (en) * 1998-10-13 2001-06-26 Jason E. Green Bi-fuel control system and assembly for reciprocating diesel engine powered electric generators
WO2001059280A1 (en) * 2000-02-11 2001-08-16 Westport Research Inc. Method and apparatus for dual fuel injection into an internal combustion engine
US20040149255A1 (en) * 2000-05-08 2004-08-05 Cummins Inc. Multiple operating mode engine and method of operation
EP1632665A1 (en) * 2004-09-03 2006-03-08 Infineum International Limited A method for improving the power output of a dual-fuel gas engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090968A1 (en) * 2009-06-03 2010-12-04 Landi Renzo Spa Method and device for feeding a diesel engine with dual fuel
WO2010139572A1 (en) * 2009-06-03 2010-12-09 Landi Renzo S.P.A. Method and device for powering a diesel engine with dual fuel feed
EP2628922A1 (en) * 2012-02-16 2013-08-21 MAN Truck & Bus AG Method for operating a self-igniting combustion engine

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