GB2461552A - Method of starting an internal combustion engine - Google Patents
Method of starting an internal combustion engine Download PDFInfo
- Publication number
- GB2461552A GB2461552A GB0812151A GB0812151A GB2461552A GB 2461552 A GB2461552 A GB 2461552A GB 0812151 A GB0812151 A GB 0812151A GB 0812151 A GB0812151 A GB 0812151A GB 2461552 A GB2461552 A GB 2461552A
- Authority
- GB
- United Kingdom
- Prior art keywords
- combustion engine
- starting
- ignition
- time delay
- oil
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007858 starting material Substances 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims description 28
- 239000010705 motor oil Substances 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2300/00—Control related aspects of engine starting
- F02N2300/10—Control related aspects of engine starting characterised by the control output, i.e. means or parameters used as a control output or target
- F02N2300/102—Control of the starter motor speed; Control of the engine speed during cranking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2300/00—Control related aspects of engine starting
- F02N2300/20—Control related aspects of engine starting characterised by the control method
- F02N2300/2011—Control involving a delay; Control involving a waiting period before engine stop or engine start
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
A method for starting a combustion engine of a vehicle is provided, which comprises the steps of operating the combustion engine by means of a starter and igniting the combustion engine after a time delay. The time delay is chosen such that an idle speed of the combustion engine is reached in a damped manner in comparison to an immediate ignition of the combustion engine. A fast meeting of idle speed is prevented so that peripheral aggregates like an oil pump may have more time to adjust itself to operating state, so that a cold start valve for the oil pump can be omitted.
Description
Method for starting a conthustion engine and starting device
Description
The invention relates to a method for starting a combustion engine as well as a starting device for carrying out such kind of a method, by means of which a combustion engine may be brought from a not turning state to an ignited state.
For starting a combustion engine of a motor vehicle it is known to use an electrically operated starter. By means of the starter the combustion engine is operated such, that the combustion engine turns, this means the crank shaft of the combustion engine rotates. As soon as possible the combustion engine may be ignited by means of a starting device, for instance by injecting fuel into a cylinder of the combustion engine. Nearly after one full revolution of the crank shaft the combustion engine is ignited or it is tried to ignite the combustion engine.
It is a disadvantage of such kind of a starting method that during or directly after the start of the combustion engine high forces occur. For instance the oil pressure of an indirect controlled oil pump may exceed the allowable limit, so that a pressure relief valve ("cold start valve") has to be provided for safety.
Particularly at cold ambient temperatures of -40°C to 0°C, for instance -30°C to -20°C, it is difficult to adjust the oil pump correctly by means of a control unit, so that an excess of the allowable oil pressure limit is very likely. The occurring forces at the start of the combustion engine lead to special constructive measures leading to a complicated and costly combustion engine design.
It is the object of the invention to provide a method for starting a combustion engine and a starting device enabling a facilitated combustion engine design.
The solution of the object is achieved by a method for starting a combustion engine with the features of claim 1 as well as a starting device with the features of claim 6. Preferred embodiments are given by the dependent claims.
According to the invention a method for starting a combustion engine of a vehicle is provided, which comprises the steps of operating the combustion engine by means of an starter and igniting the combustion engine after a time delay, wherein the time delay is chosen such, that an idle speed of the combustion engine is reached in a damped manner in comparison to an immediate ignition of the combustion engine.
Due to the time delayed ignition of the combustion engine the starter provides a higher speed of the combustion engine until the combustion engine is ignited in comparison to a start without a time delayed ignition.
The crank shaft may turn more revolutions and is accelerated only by means of the starter to a higher speed until the ignition occur in comparison to an immediate start of the combustion engine, when the combustion engine is ignited as soon as possible. A fast meeting of idle speed is prevented so that peripheral aggregates like an oil pump may have more time to adjust itself to operating state and to overcome improper conditions due to the previous non-operating time while standing still. For instance it is possible to safeguard that an overpressure of the oil pump is prevented, so that a pressure relief valve ("cold start valve") for the oil pump can be omitted. This leads to a reduced number of assembling parts and enables a facilitated combustion engine design.
Particularly the absolute value of the gradient of the speed of the combustion engine with respect to time with delayed ignition is lower than the speed of the combustion engine with respect to time with immediate ignition over most of the time until reaching idle speed.
A slower change of the crank shaft speed facilitates an adjustment of the peripheral aggregates.
The time delay td may be 0.5s �= td �= 6.Os, particularly 0.7s �= td �= 5.Os, preferably 0.8s �= td �= 4.Os and most preferred 0.9s �= t �= 2.5s.
This time delay td is sufficient to prevent too high forces without the need of a significant oversized starter.
Preferably the ignition is initiated after a number of revolutions N of the combustion engine, which are 2 �= N �= 50, particularly 4 �= N �= 35, preferably 6 �= N �= 20 and most preferred 8 �= N �= 10. This number of revolutions of the crank shaft is sufficient to prevent too high forces without the need of a significant oversized starter.
In a preferred embodiment motor oil is pumped to the combustion engine in consideration of a measured oil pressure, which is measured at the end of the combustion engine after passing several aggregates of the combustion engine. This leads to an indirect oil pressure control, which is easy to provide. Due to the slower meeting of idle speed an indirect pressure measurement is possible without the risk of overpressure. It is not necessary to provide a second pressure measurement device at the outlet of the oil pump.
The invention further relates to a starting device for starting a combustion engine of a vehicle, which is particularly adapted for carrying out the above mentioned starting method. The starting device comprises a starter for operating the combustion engine during a not ignited state, this means during the time from a standing still state to an ignited state. Further an ignition device for igniting the combustion engine and a control unit adapted to activate the ignition device after a time delay with respect to the start of the starter are provided, wherein the time delay is chosen such, that an idle speed of the combustion engine is reached in a damped manner in comparison to an immediate ignition of the combustion engine. As described with respect to the starting method, a fast meeting of idle speed is prevented so that peripheral aggregates like an oil pump may have more time to adjust itself to operating state, so that a cold start valve for the oil pump can be omitted. This enables a facilitated combustion engine design.
The invention further relates to a motor vehicle comprising a combustion engine and a starting device, which may be designed as previously described, wherein an oil pump is provided for pumping motor oil through an oil circuit. Since a cold start valve for the oil circuit can be omitted, a facilitated combustion engine design is possible. Particularly the oil pump is valve-free connected to the oil circuit of the combustion engine.
This means that in flowing direction between the oil pump and the oil circuit a valve, particularly a pressure relief valve, is not provided These and other aspects of the invention will be apparent from and elucidated with reference to a preferred embodiment described hereinafter.
In the drawing: Fig. 1 is a schematic diagram comparing engine speed and oil pressure with respect to time of the method according to the invention in comparison to a method according to the state of the art.
In Fig. 1 it is shown an engine speed of the combustion engine in revolutions per minute (left values) as well as an oil pressure of motor oil inside a main oil gallery of the combustion engine in bar (right values) over the time in seconds.
A first speed curve 10 shows the engine speed during a cold start of the combustion engine according to the state of the art. A second speed curve 12 shows the engine speed during a cold start of the combustion engine according to the invention. The absolute value of the gradient of the second speed curve is significant lower, so that an idle speed 14 of approximately 1000 rpm is reached later and in a damped manner in comparison to the first speed curve 10.
The fast meeting of idle speed according to the first speed curve 10 leads to a pressure peak 16 inside the main oil gallery of the combustion engine as illustrated by a first pressure curve 18. Particularly it is possible that without a cold start valve the pressure may exceed a maximum allowable pressure 20 of approximately 16 bar. Due to the slower rise of the engine speed according to the invention a pressure peak 16 may be mainly prevented, so that a second pressure curve 22 according to the invention is always significantly below the maximum allowable pressure 20 and above an intended minimum pressure 24. Since the second pressure curve 22 comprises less amplitudes with respect to a target value special constructive measures leading to a complicated and costly combustion engine design may be omitted.
Claims (8)
- Claims 1. Method for starting a combustion engine of a vehicle comprising the steps of operating the combustion engine by means of an starter and igniting the combustion engine after a time delay, wherein the time delay is chosen such, that an idle speed of the combustion engine is reached in a damped manner in comparison to an immediate ignition of the combustion engine.
- 2. Method according to claim 1 whereby the absolute value of the gradient of the speed of the combustion engine with respect to time with delayed ignition is lower than the speed of the combustion engine with respect to time with immediate ignition over most of the time until reaching idle speed.
- 3. Method according to claim 1 or 2 whereby the time delay td is O.5s �= td �= 6.Os, particularly O.7s �= td �= 5.Os, preferably 0.8s �= td �= 4.Os and most preferred O.9s �= td �= 2.5s.
- 4. Method according to anyone of claims 1 to 3 whereby the ignition is initiated after a number of revolutions N of the combustion engine, which are 2 �= N �= 50, particularly 4 �= N �= 35, preferably 6 �= N �= 20 and most preferred 8 �= N �= 10.
- 5. Method according to anyone of claims 1 to 4 whereby motor oil is pumped to the combustion engine in consideration of a measured oil pressure, which is measured at the end of the combustion engine after passing several aggregates of the combustion engine.
- 6. Starting device for starting a combustion engine of a vehicle, particularly according to the method of anyone of claims 1 to 5, comprising a starter for operating the combustion engine during an not ignited state, an ignition device for igniting the combustion engine and a control unit adapted to activate the ignition device after a time delay with respect to the start of the starter, wherein the time delay is chosen such, that an idle speed of the combustion engine is reached in a damped manner in comparison to an immediate ignition of the combustion engine.
- 7. Motor vehicle comprising a combustion engine and a starting device according to claim 6, wherein an oil pump is provided for pumping motor oil through an oil circuit of the combustion engine.
- 8. Motor vehicle according to claim 7, whereby the oil pump is valve-free connected to the oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0812151A GB2461552A (en) | 2008-07-03 | 2008-07-03 | Method of starting an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0812151A GB2461552A (en) | 2008-07-03 | 2008-07-03 | Method of starting an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0812151D0 GB0812151D0 (en) | 2008-08-13 |
| GB2461552A true GB2461552A (en) | 2010-01-06 |
Family
ID=39717880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0812151A Withdrawn GB2461552A (en) | 2008-07-03 | 2008-07-03 | Method of starting an internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2461552A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276131B1 (en) * | 1998-12-17 | 2001-08-21 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for controlling internal combustion engine |
| US6491024B1 (en) * | 2000-10-11 | 2002-12-10 | Ford Global Technologies, Inc. | System and method for cold start control of internal combustion engines |
| US20040020472A1 (en) * | 2000-11-16 | 2004-02-05 | Klaus Bayerle | Method for injecting fuel during the starting phase of an internal combustion engine |
| US20070056553A1 (en) * | 2004-04-14 | 2007-03-15 | Bernd Kohler | Method for operating an internal combustion engine with direct fuel injection during a post-start phase |
-
2008
- 2008-07-03 GB GB0812151A patent/GB2461552A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276131B1 (en) * | 1998-12-17 | 2001-08-21 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for controlling internal combustion engine |
| US6491024B1 (en) * | 2000-10-11 | 2002-12-10 | Ford Global Technologies, Inc. | System and method for cold start control of internal combustion engines |
| US20040020472A1 (en) * | 2000-11-16 | 2004-02-05 | Klaus Bayerle | Method for injecting fuel during the starting phase of an internal combustion engine |
| US20070056553A1 (en) * | 2004-04-14 | 2007-03-15 | Bernd Kohler | Method for operating an internal combustion engine with direct fuel injection during a post-start phase |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0812151D0 (en) | 2008-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S30Z | Assignments for licence or security reasons |
Free format text: APPLICANT GM GLOBAL TECHNOLOGY OPERATIONS, INC SECURITY TO THE UNITED STATES DEPARTMENT OF THE TREASURY |
|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |