WO1993002284A1 - Injection combustion engine with fuel heating element - Google Patents

Injection combustion engine with fuel heating element Download PDF

Info

Publication number
WO1993002284A1
WO1993002284A1 PCT/NL1992/000130 NL9200130W WO9302284A1 WO 1993002284 A1 WO1993002284 A1 WO 1993002284A1 NL 9200130 W NL9200130 W NL 9200130W WO 9302284 A1 WO9302284 A1 WO 9302284A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
heating element
combustion engine
plate
injection combustion
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/NL1992/000130
Other languages
French (fr)
Inventor
Arnoldus Maria Brouwers
Robertus Joseph Pelgrim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Texas Instruments Holland BV
Original Assignee
Texas Instruments Holland BV
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
Application filed by Texas Instruments Holland BV filed Critical Texas Instruments Holland BV
Priority to EP92918458A priority Critical patent/EP0594794B1/en
Priority to DE69200853T priority patent/DE69200853T2/en
Publication of WO1993002284A1 publication Critical patent/WO1993002284A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/135—Fuel-air mixture
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an injection combustion engine with electrical spark ignition, comprising at least one cylinder with intake duct, at least one inlet valve fitted in the cylinder head, at least one fuel injector, and a heating element provided downstream of said injector.
  • Such a combustion engine is known from DE-C-3,426,469 and NL-A- 8,801,334.
  • Heating the fuel/air mixture in this phase therefore makes a considerable contribution to improvement of the environment, and also achieves a considerable fuel saving, because little or no additional fuel need be injected.
  • the fuel in the combustion engine mentioned in the preamble is sprayed onto the heating element brought to the desired temperature in a short time, and is thereby brought to the desired temperature. This will make the fuel vaporise better, and a better mixing with the combustion air is also achieved.
  • the heating element is switched off when the engine is warm enough to take over vaporisation of the fuel.
  • the heating element is made in the form of a pipe projecting into the intake duct of the cylinder and surrounded by an insulating tube.
  • the pipe and the tube are provided with an edge flange which lies in a recess of the cylinder head and is fixed by the air inlet duct.
  • a disadvantage of this design is that it is a time-consuming job to fit and replace the heating element.
  • the same problem applies to the engine according to NL-A-8,801,33 ⁇ » i n which the heating element is integrated in a plate wedged between the intake duct and the cylinder head.
  • the object of the invention is to eliminate this disadvantage and to provide an engine of the type described in the preamble, in which the heating element, on the one hand, is of an extremely simple " and cheap design and, on the other, is easy to fit and replace.
  • the efficiency and speed of heating is also improved, due to the fact that there is less mass between heated element and heat-absorbing mixture than is usual.
  • the injection combustion engine mentioned in the preamble to this end is characterised in that the heating element is made in the form of a plate with electrically insulating properties, such as an enamelled metal plate or a ceramic plate on which a current-conducting material with a current supply and a current discharge connection is printed.
  • the heating element is made in the form of a plate with electrically insulating properties, such as an enamelled metal plate or a ceramic plate on which a current-conducting material with a current supply and a current discharge connection is printed.
  • the heating element can be fixed inside the intake duct at a distance from its inner surface, and the plate can be bent into a channel shape.
  • a thermostat can be provided in the current supply to or discharge from the printed current-conducting material.
  • a PTC element can be fixed on the plate in the current path in such a way that with increasing temperature the current through the printed electrically conducting material decreases.
  • the preferred alternative is, however, for the current conducting printed circuit itself to have PTC properties.
  • the invention also relates to a heating element for an engine, made in the form of an electrically insulating plate on which an electrically conducting material with a current supply and a current discharge connection is printed.
  • Figure 1 shows a cross-section of a part of a combustion engine according to the invention.
  • Figure 2 shows a perspective view of the heating element to be used n the engine according to Figure 1.
  • Figure 3 shows a top view of the heating element according to Figure 2.
  • Figure 4 shows a top view of an alternative embodiment of the heating element.
  • the part of an injection engine shown in Figure 1 comprises an air inlet duct 1, which is fixed on a cylinder head 2 in such a way that it connects to a duct 3 for supplying a fuel-air mixture to the cylinder by means of one or two inlet valves 4.
  • the ducts 1 and 3 form the so-called intake duct.
  • An injector 5 for injecting fuel connected to a fuel supply duct 5a, is fixed on the air inlet duct 1.
  • the fuel is sprayed onto a heating element 6 during injection.
  • This heating element is connected by means of a rod 7 or the like to a cover 8 fitted so that it is sealed in an aperture of the duct 2.
  • the heating element 6 is situated at a place where the injected fuel comes into contact with the element 6.
  • a partition which is known per se can be provided between the end of the duct 2 facing the valves and the heating element 6.
  • the heating element 6 comprises an electrically insulating plate bent into a channel shape and having a resistor printed circuit 9 of an electrically conducting ink or paste, and a current supply 10 and a current discharge 11.
  • the plate is, for example, an enamelled metal plate, or it is made of ceramic material.
  • the simplest and most reliable embodiment is that in which the printed circuit 9 itself - at least a part of it - is made of an ink or paste with PTC (positive temperature coefficient) prop ties.
  • the plate 6 It is not necessary for the plate 6 to be bent into a channel shape. It can also be flat.
  • the zigzag shape of printed circuit 9 shown can also be replaced by a printed circuit covering the entire surface of the plate.
  • the heating element can also be fitted in the air inlet duct 1, of course at a place where the injected fuel comes into contact with it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Resistance Heating (AREA)

Abstract

An injection combustion engine with electrical spark ignition comprises at least one cylinder with an intake duct (1) at least one inlet valve (4) fitted in the cylinder head (2) at least one fuel injector (5) and a heating element (6) provided downstream of said injector. The heating element comprises a plate with electrically insulating properties, such as an enamelled metal plate or a ceramic plate on which a current-conducting meterial with a current supply and a current discharge connection printed. This printed circuit can have PTC properties.

Description

Title: Injection combustion engine with fuel heating element.
The invention relates to an injection combustion engine with electrical spark ignition, comprising at least one cylinder with intake duct, at least one inlet valve fitted in the cylinder head, at least one fuel injector, and a heating element provided downstream of said injector.
Such a combustion engine is known from DE-C-3,426,469 and NL-A- 8,801,334.
Most of the total exhaust gas emission is formed in the short period during which the engine has not yet reached its operating temperature. Exhaust gas catalytic converters, which in normal circumstances reduce the exhaust gas emission by about 90 , reach this degree of conversion only when the operating temperature of the catalytic converter has been reached. The conversion starts at a temperature of around 300°C, so that after a cold start the exhaust gas emission of the engine undergoes little or no reduction in a catalytic converter. Since the temperature level during a cold start is not high enough to vaporise the fuel (petrol or alcohol) sufficiently, an additional quantity of fuel must be added when the engine is cold, in order to obtain a combustible mixture. This leads to a high exhaust gas emission. At low engine temperature both fuel consumption and exhaust gas emission are therefore relatively high. Heating the fuel/air mixture in this phase therefore makes a considerable contribution to improvement of the environment, and also achieves a considerable fuel saving, because little or no additional fuel need be injected. The fuel in the combustion engine mentioned in the preamble is sprayed onto the heating element brought to the desired temperature in a short time, and is thereby brought to the desired temperature. This will make the fuel vaporise better, and a better mixing with the combustion air is also achieved. The heating element is switched off when the engine is warm enough to take over vaporisation of the fuel. In the case of the engine known from DE-C-3.^26,469 the heating element is made in the form of a pipe projecting into the intake duct of the cylinder and surrounded by an insulating tube. The pipe and the tube are provided with an edge flange which lies in a recess of the cylinder head and is fixed by the air inlet duct. A disadvantage of this design is that it is a time-consuming job to fit and replace the heating element. The same problem applies to the engine according to NL-A-8,801,33^» in which the heating element is integrated in a plate wedged between the intake duct and the cylinder head.
The object of the invention is to eliminate this disadvantage and to provide an engine of the type described in the preamble, in which the heating element, on the one hand, is of an extremely simple "and cheap design and, on the other, is easy to fit and replace. The efficiency and speed of heating is also improved, due to the fact that there is less mass between heated element and heat-absorbing mixture than is usual.
According to the invention, the injection combustion engine mentioned in the preamble to this end is characterised in that the heating element is made in the form of a plate with electrically insulating properties, such as an enamelled metal plate or a ceramic plate on which a current-conducting material with a current supply and a current discharge connection is printed.
In order to improve the transfer of heat from the heating element to the fuel-air mixture, the heating element can be fixed inside the intake duct at a distance from its inner surface, and the plate can be bent into a channel shape.
There are three possibilities for automatic switching off of the electric current when the engine is warm. A thermostat can be provided in the current supply to or discharge from the printed current-conducting material. As an alternative, a PTC element can be fixed on the plate in the current path in such a way that with increasing temperature the current through the printed electrically conducting material decreases. The preferred alternative is, however, for the current conducting printed circuit itself to have PTC properties.
The invention also relates to a heating element for an engine, made in the form of an electrically insulating plate on which an electrically conducting material with a current supply and a current discharge connection is printed. The invention will now be explained in greater detail with reference to the figures.
Figure 1 shows a cross-section of a part of a combustion engine according to the invention.
Figure 2 shows a perspective view of the heating element to be used n the engine according to Figure 1.
Figure 3 shows a top view of the heating element according to Figure 2.
Figure 4 shows a top view of an alternative embodiment of the heating element. The part of an injection engine shown in Figure 1 comprises an air inlet duct 1, which is fixed on a cylinder head 2 in such a way that it connects to a duct 3 for supplying a fuel-air mixture to the cylinder by means of one or two inlet valves 4. The ducts 1 and 3 form the so-called intake duct.
An injector 5 for injecting fuel, connected to a fuel supply duct 5a, is fixed on the air inlet duct 1.
In order to bring injected fuel to the desired temperature when the engine is cold, the fuel is sprayed onto a heating element 6 during injection. This heating element is connected by means of a rod 7 or the like to a cover 8 fitted so that it is sealed in an aperture of the duct 2. As can be seen from the drawing, the heating element 6 is situated at a place where the injected fuel comes into contact with the element 6. In the case of a cylinder with two inlet valves a partition which is known per se can be provided between the end of the duct 2 facing the valves and the heating element 6.
The heating element 6 comprises an electrically insulating plate bent into a channel shape and having a resistor printed circuit 9 of an electrically conducting ink or paste, and a current supply 10 and a current discharge 11. The plate is, for example, an enamelled metal plate, or it is made of ceramic material.
A provision will be necessary in order to interrupt the current when the engine is warm enough. It can be a thermostat fitted in the current supply or discharge. However, in the embodiment shown in Figure 4 a PTC element 12 has been selected, said element being glued on the enamelled printed circuit and greatly restricting the passage of current at a certain temperature.
The simplest and most reliable embodiment is that in which the printed circuit 9 itself - at least a part of it - is made of an ink or paste with PTC (positive temperature coefficient) prop ties.
Various variants are conceivable within the scope of the invention. It is not necessary for the plate 6 to be bent into a channel shape. It can also be flat. The zigzag shape of printed circuit 9 shown can also be replaced by a printed circuit covering the entire surface of the plate. The heating element can also be fitted in the air inlet duct 1, of course at a place where the injected fuel comes into contact with it.

Claims

Claims
1. Injection combustion engine with electrical spark ignition, comprising at least one cylinder with intake duct, at least one inlet valve fitted in the cylinder head, at least one fuel injector, and a heating element provided downstream of said injector, characterised in that the heating element is made in the form of a plate (6) with electrically insulating properties, such as an enamelled metal plate or a ceramic plate on which a current-conducting material (9) with a current supply and a current discharge connection is printed. 2. Injection combustion engine according to Claim 1, characterised in that the heating element is fixed inside the intake duct (1,
2) at a distance from its inner surface.
3. Injection combustion engine according to Claim 1 or 2, characterised in that the plate (6) is bent into a channel shape.
4. Injection combustion engine according to one of the preceding claims, characterised in that a thermostat is fitted in the current supply to or discharge from the printed current-conducting material (9)•
5. Injection combustion engine according to one of Claims 1 to 3. characterised in that a PTC element (12) is fixed on the plate (6) in the current path in such a way that with increasing temperature the current through the printed electrically conducting material (9) decreases.
6. Injection combustion engine according to one of Claims 1 to 3ι characterised in that the current-conducting printed circuit (9) itself has PTC properties. 1. Heating element for an engine according to one of the preceding claims, comprising an electrically insulating plate on which a current- conducting material (9) with a current supply and a current discharge connection is printed.
PCT/NL1992/000130 1991-07-17 1992-07-14 Injection combustion engine with fuel heating element Ceased WO1993002284A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP92918458A EP0594794B1 (en) 1991-07-17 1992-07-14 Injection combustion engine with fuel heating element
DE69200853T DE69200853T2 (en) 1991-07-17 1992-07-14 INJECTION COMBUSTION ENGINE WITH FUEL HEATING ELEMENT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9101256 1991-07-17
NL9101256A NL9101256A (en) 1991-07-17 1991-07-17 INJECTION COMBUSTION ENGINE WITH FUEL HEATING ELEMENT.

Publications (1)

Publication Number Publication Date
WO1993002284A1 true WO1993002284A1 (en) 1993-02-04

Family

ID=19859528

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1992/000130 Ceased WO1993002284A1 (en) 1991-07-17 1992-07-14 Injection combustion engine with fuel heating element

Country Status (5)

Country Link
EP (1) EP0594794B1 (en)
AU (1) AU2471192A (en)
DE (1) DE69200853T2 (en)
NL (1) NL9101256A (en)
WO (1) WO1993002284A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622540A1 (en) * 1993-04-30 1994-11-02 Firma Carl Freudenberg Heating device for an internal combustion engine
CN1074506C (en) * 1995-11-03 2001-11-07 卡明斯发动机公司 Intake air heater and air delivery assembly for engines
US6616066B2 (en) 2000-01-29 2003-09-09 Daimlerchrysler Ag Injection valve
DE10053583B4 (en) * 2000-01-29 2004-11-25 Daimlerchrysler Ag Injector
WO2010043915A3 (en) * 2008-10-17 2010-07-01 Ip Consortium Limited Throttle assembly and method
US11125191B2 (en) 2011-12-06 2021-09-21 Oval Engine Ltd Engine intake apparatus and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900439A3 (en) 2006-04-27 2007-11-02 Renault Sas INJECTION DEVICE WITH A MIXER OBSTACLE IN THE EXHAUST PIPE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378001A (en) * 1979-08-01 1983-03-29 Toyota Jidosha Kabushiki Kaisha Fuel injection type carburetor
FR2597694A1 (en) * 1986-04-18 1987-10-23 Journee Paul Flexible heating strip for a receptacle for a motor vehicle
EP0404477A1 (en) * 1989-06-20 1990-12-27 Texas Instruments Incorporated A fuel supply device and heating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378001A (en) * 1979-08-01 1983-03-29 Toyota Jidosha Kabushiki Kaisha Fuel injection type carburetor
FR2597694A1 (en) * 1986-04-18 1987-10-23 Journee Paul Flexible heating strip for a receptacle for a motor vehicle
EP0404477A1 (en) * 1989-06-20 1990-12-27 Texas Instruments Incorporated A fuel supply device and heating device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 098 (M-375)27 April 1985 & JP,A,59 221 452 ( YAMAHA HATSUDOKI KK ) 13 December 1984 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622540A1 (en) * 1993-04-30 1994-11-02 Firma Carl Freudenberg Heating device for an internal combustion engine
DE4314283A1 (en) * 1993-04-30 1994-11-10 Freudenberg Carl Fa Heating module for an internal combustion engine
CN1074506C (en) * 1995-11-03 2001-11-07 卡明斯发动机公司 Intake air heater and air delivery assembly for engines
US6616066B2 (en) 2000-01-29 2003-09-09 Daimlerchrysler Ag Injection valve
DE10053583B4 (en) * 2000-01-29 2004-11-25 Daimlerchrysler Ag Injector
US7186351B2 (en) 2000-01-29 2007-03-06 Daimlerchrysler Ag Injection valve
WO2010043915A3 (en) * 2008-10-17 2010-07-01 Ip Consortium Limited Throttle assembly and method
GB2476919A (en) * 2008-10-17 2011-07-13 Ip Consortium Ltd Throttle assembly and method
US11125191B2 (en) 2011-12-06 2021-09-21 Oval Engine Ltd Engine intake apparatus and method

Also Published As

Publication number Publication date
DE69200853D1 (en) 1995-01-19
AU2471192A (en) 1993-02-23
EP0594794B1 (en) 1994-12-07
EP0594794A1 (en) 1994-05-04
NL9101256A (en) 1993-02-16
DE69200853T2 (en) 1995-04-13

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