EP2635787A1 - An arrangement for handling rotational information of an internal combustion engine - Google Patents

An arrangement for handling rotational information of an internal combustion engine

Info

Publication number
EP2635787A1
EP2635787A1 EP11784731.9A EP11784731A EP2635787A1 EP 2635787 A1 EP2635787 A1 EP 2635787A1 EP 11784731 A EP11784731 A EP 11784731A EP 2635787 A1 EP2635787 A1 EP 2635787A1
Authority
EP
European Patent Office
Prior art keywords
signal
pulse train
phase
common signal
arrangement
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.)
Granted
Application number
EP11784731.9A
Other languages
German (de)
French (fr)
Other versions
EP2635787B1 (en
Inventor
Pasi Juppo
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.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
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 Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2635787A1 publication Critical patent/EP2635787A1/en
Application granted granted Critical
Publication of EP2635787B1 publication Critical patent/EP2635787B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration

Definitions

  • This invention relates to arrangements that handle rotational information of an internal combustion engine. So, the invention relates to, for example, sensors means that measure position of the engine's crank angle, or indicate the engines phase. Further the invention relates processor units that handle the measurement information from sensors. In addition, the invention relates to a network that distributes the rota- tional information.
  • angular position of a crank shaft This can be arranged, for example, by measuring angular position of the flywheel that is fixed on the crank shaft.
  • An angular position sensor forms a pulse train that can be used for measuring position of the crank shaft, speed and a direction of the rotation.
  • the pulse train is usually called as a position pulse train.
  • the camshaft is provided with a cam that indicates a phase of the engine.
  • the position pulse train signal and the phase signal are distributed in the engine system to the devices that use the signals. The installation of the distribution system of the signals is rather complex and expensive task.
  • the objective of the invention is to provide a simple and cost-effective solution to the distribution of the position pulse train signal and the phase signal for the internal combustion engine.
  • the objective is achieved in a way that is described in the independent claim.
  • the idea of the invention is that the position pulse train signal and the phase signal are combined. In this way only one hardwired distribution network is needed for the devices using the signals.
  • the invention comprises an encoder that combines the signals.
  • the position pulse train signal has a low level and a high level.
  • the combination is made in such a way that voltage values of said levels of the pulse train signal in the common signal depend on the phase signal. Therefore the combined (common) signal carries the position information of the crank shaft and the phase information of the engine.
  • Figure 1 illustrates a schematic example of an arrangement of the invention
  • Figure 2 illustrates a schematic example of an inventive signal comprising the posi- tion and phase information.
  • the arrangement of figure 1 comprises an encoder 2 that can be situated in a control module 6 of an internal combustion engine 1.
  • the encoder 2 is capable of receiv- ing pulse train information from a position sensor 4. It is practical that the position sensor 4 is located next to a flywheel 3 of the engine wherein the position sensor 4 detects pulses from the flywheel 3 teeth.
  • the position information obtained from the pulses indicates a position of the engine's crank shaft, and can also be used for detecting speed and a direction of the rotation of the crank shaft.
  • the encoder 2 is also capable of receiving phase information from a phase sensor 5 that can be installed next to the camshaft of the engine.
  • the phase information from the phase sensor 5 depends on a structure of a cam on the camshaft and the phase sensor 5 itself.
  • the encoder 2 is arranged to combine the phase information of the engine and the position information.
  • the combined, i.e. common, signal comprises the both informa- tion types.
  • the encoder also (and the control module 6 in the example of figure 1 ) comprises an output 9 for sending the common signal. So, the common signal can be distributed to different devices 7, 8 that need and use the position and phase information.
  • the common signal is distributed to an electronic fuel injection control (EFIC) 8 and speed and load controller 7.
  • EFIC electronic fuel injection control
  • the speed and load controller 7 may also be included in the electronic fuel injection control 8. Since the same signal comprises the both position and phase information, only one distribution network is needed. Therefore another hardwiring, as there are in prior art systems, is not needed.
  • control device (7,8) may comprise a decoder 10 for decoding the common signal 21.
  • the common signal can also be transmitted out from the engine's immediate surroundings, for example, to a remote monitoring system.
  • Figure 2 illustrates a schematic example of the common signal 21.
  • a normal pulse train signal has a high signal level and a low signal level. The pulses are performed when the signal's amplitude changes from the low level to the high level and vice versa.
  • the voltage values of the low and high levels can be changed by setting an offset value to the pulse train signal.
  • the offset value depends on the phase signal.
  • the offset value, i.e. component, in the common signal is determined by the phase signal period.
  • the phase signal can be illustrated as a periodic signal having two parts inside the period.
  • the offset component is in the common signal according to another half of the phase signal's period.
  • the common signal 21 comprises one offset value (OFF1 ), two low levels (LL1 , LL2) and two high levels (HL1 , HL2). It should be noted that in this description offset of the pulse train signal is zero (no offset) when the low level of the pulse train is zero volts.
  • the phase signal determines moments when the offset is switched on or off in the common signal.
  • the encoder is arranged to make these actions for forming the common signal.
  • the first low level LL1 is zero volts and the first high level HL1 is above that value for example 18 volts.
  • the phase signal has determined the switching-on of the offset OFF1.
  • the switching-on of the offset moves the first low level LL1 to the second low level LL2, for example to 6 volts.
  • the first high level HL1 changes to the second high level HL2.
  • period P2 having in this example the same duration as period P1 , has passed, the offset value OFF1 is switched off, set by the phase information.
  • the period of the offset change corresponds with the phase of the engine. It should be mentioned that the periods P1 and P2 may have different durations, but this feature do not hinder the detection of the engine's phase. Further the periods may differ a little if the switching on or off the offset occurs during the high level or the low level of the pulse train, i.e. not at moments of raising or falling edges of the single pulse.
  • the encoder 2 can be placed into another location as the control unit 6.
  • the encoder 2 can be realized as a software entity, a printed circuit board, and an ASIC-circuit etc.
  • the position sensor 4 can also be placed to another location, such as a crank wheel.
  • the encoder may have to convert the voltage level of the pulse train signal to be suitable for the distribution network.
  • the pulse train signal is decreased 6 volts in order to give space to the pulse train with the offset OFF1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

The invention combines a position pulse train signal and a phase signal. In this way only one hardwired distribution network is needed for the devices using the signals. The invention comprises an encoder (2) that combine the signals in such a way that the offset of the pulse train signal depends on the phase signal.

Description

An arrangement for handling rotational information of an internal combustion engine
Field of technology
This invention relates to arrangements that handle rotational information of an internal combustion engine. So, the invention relates to, for example, sensors means that measure position of the engine's crank angle, or indicate the engines phase. Further the invention relates processor units that handle the measurement information from sensors. In addition, the invention relates to a network that distributes the rota- tional information.
Prior art
It is known to measure angular position of a crank shaft. This can be arranged, for example, by measuring angular position of the flywheel that is fixed on the crank shaft. An angular position sensor forms a pulse train that can be used for measuring position of the crank shaft, speed and a direction of the rotation. The pulse train is usually called as a position pulse train. There exist different solutions to the measurement and the creation of the position pulse train. It is also known to measure a phase of the engine. The measurement is achieved from the camshaft of the engine. The camshaft is provided with a cam that indicates a phase of the engine. The position pulse train signal and the phase signal are distributed in the engine system to the devices that use the signals. The installation of the distribution system of the signals is rather complex and expensive task.
Short Description of Invention
The objective of the invention is to provide a simple and cost-effective solution to the distribution of the position pulse train signal and the phase signal for the internal combustion engine. The objective is achieved in a way that is described in the independent claim. The idea of the invention is that the position pulse train signal and the phase signal are combined. In this way only one hardwired distribution network is needed for the devices using the signals.
The invention comprises an encoder that combines the signals. The position pulse train signal has a low level and a high level. The combination is made in such a way that voltage values of said levels of the pulse train signal in the common signal depend on the phase signal. Therefore the combined (common) signal carries the position information of the crank shaft and the phase information of the engine.
Drawings
Next the invention is described in more detail with the figures of the attached drawings in which drawings:
Figure 1 illustrates a schematic example of an arrangement of the invention and
Figure 2 illustrates a schematic example of an inventive signal comprising the posi- tion and phase information.
Description
The arrangement of figure 1 comprises an encoder 2 that can be situated in a control module 6 of an internal combustion engine 1. The encoder 2 is capable of receiv- ing pulse train information from a position sensor 4. It is practical that the position sensor 4 is located next to a flywheel 3 of the engine wherein the position sensor 4 detects pulses from the flywheel 3 teeth. The position information obtained from the pulses indicates a position of the engine's crank shaft, and can also be used for detecting speed and a direction of the rotation of the crank shaft. The encoder 2 is also capable of receiving phase information from a phase sensor 5 that can be installed next to the camshaft of the engine. The phase information from the phase sensor 5 depends on a structure of a cam on the camshaft and the phase sensor 5 itself.
The encoder 2 is arranged to combine the phase information of the engine and the position information. The combined, i.e. common, signal comprises the both informa- tion types. The encoder also (and the control module 6 in the example of figure 1 ) comprises an output 9 for sending the common signal. So, the common signal can be distributed to different devices 7, 8 that need and use the position and phase information. In figure 1 , the common signal is distributed to an electronic fuel injection control (EFIC) 8 and speed and load controller 7. The speed and load controller 7 may also be included in the electronic fuel injection control 8. Since the same signal comprises the both position and phase information, only one distribution network is needed. Therefore another hardwiring, as there are in prior art systems, is not needed. It should be noted that the other hardwiring may be required for safety rea- sons. Although, only one signal is used the accuracy of the signals remain. As can be also seen in the example of figure 1 the control device (7,8) may comprise a decoder 10 for decoding the common signal 21. The common signal can also be transmitted out from the engine's immediate surroundings, for example, to a remote monitoring system.
Figure 2 illustrates a schematic example of the common signal 21. A normal pulse train signal has a high signal level and a low signal level. The pulses are performed when the signal's amplitude changes from the low level to the high level and vice versa. The voltage values of the low and high levels can be changed by setting an offset value to the pulse train signal. In the common signal the offset value depends on the phase signal. The offset value, i.e. component, in the common signal is determined by the phase signal period. The phase signal can be illustrated as a periodic signal having two parts inside the period. The offset component is in the common signal according to another half of the phase signal's period. In such a way that the common signal 21 comprises one offset value (OFF1 ), two low levels (LL1 , LL2) and two high levels (HL1 , HL2). It should be noted that in this description offset of the pulse train signal is zero (no offset) when the low level of the pulse train is zero volts.
The phase signal determines moments when the offset is switched on or off in the common signal. The encoder is arranged to make these actions for forming the common signal. For example in figure 2, the first low level LL1 is zero volts and the first high level HL1 is above that value for example 18 volts. When a period P1 has passed, the phase signal has determined the switching-on of the offset OFF1. In this example the switching-on of the offset moves the first low level LL1 to the second low level LL2, for example to 6 volts. The first high level HL1 changes to the second high level HL2. When period P2, having in this example the same duration as period P1 , has passed, the offset value OFF1 is switched off, set by the phase information. The period of the offset change corresponds with the phase of the engine. It should be mentioned that the periods P1 and P2 may have different durations, but this feature do not hinder the detection of the engine's phase. Further the periods may differ a little if the switching on or off the offset occurs during the high level or the low level of the pulse train, i.e. not at moments of raising or falling edges of the single pulse.
The above example of figure 1 illustrates only one way to construct the inventive arrangement. Other solutions are also possible. For example, the encoder 2 can be placed into another location as the control unit 6. The encoder 2 can be realized as a software entity, a printed circuit board, and an ASIC-circuit etc. The position sensor 4 can also be placed to another location, such as a crank wheel.
Further, other devices and wires may have constraints on voltage levels that can be used. For example, 24 volts may be an upper limit. Therefore the encoder may have to convert the voltage level of the pulse train signal to be suitable for the distribution network. For example, the pulse train signal is decreased 6 volts in order to give space to the pulse train with the offset OFF1.
So, it is clear that the invention is not restricted to the embodiments described in this text, but the invention can be utilized in any suitable manner within the scope of the independent claim.

Claims

Claims
1. An arrangement for handling rotational information of an internal combustion engine (1 ), characterized in that the arrangement comprises an encoder (2) that is capable of receiving a pulse train signal and a phase signal, and arranged to combine the position pulse train signal having a low level and a high level, and the phase signal for forming a common signal (21 ) in such a way that voltage values of said levels of the pulse train signal in the common signal depend on the phase signal, which common signal is distributed to at least one control device, such as an electronic fuel injection control (8) or a speed and load controller (7).
2. An arrangement according to claim 1 characterized in that the common signal (21 ) comprises an offset component, which offset component in the common signal is determined by the phase signal' period, said offset component being in the common signal according to another half of the phase signal's period.
3. An arrangement according to claim 2 characterized in that the common signal (21 ) has two top levels and two bottom levels.
4. An arrangement according to any of claim 1 - 3 characterized in that the encoder (2) is arranged to set a voltage level of the pulse train signal for the common signal (21 ).
5. An arrangement according to any of claim 1 - 4 characterized in that the ar- rangement further comprises at least one decoder (10) for decoding the common signal (21 ), which decoder is situated in the control device (7, 8).
EP11784731.9A 2010-11-02 2011-10-28 An arrangement for handling rotational information of an internal combustion engine Active EP2635787B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20106146A FI20106146A0 (en) 2010-11-02 2010-11-02 Device for processing rotational information of an internal combustion engine
PCT/FI2011/050948 WO2012059637A1 (en) 2010-11-02 2011-10-28 An arrangement for handling rotational information of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2635787A1 true EP2635787A1 (en) 2013-09-11
EP2635787B1 EP2635787B1 (en) 2015-01-21

Family

ID=43268927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11784731.9A Active EP2635787B1 (en) 2010-11-02 2011-10-28 An arrangement for handling rotational information of an internal combustion engine

Country Status (5)

Country Link
EP (1) EP2635787B1 (en)
KR (1) KR101818282B1 (en)
CN (1) CN103228896B (en)
FI (1) FI20106146A0 (en)
WO (1) WO2012059637A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866269A (en) * 1988-05-19 1989-09-12 General Motors Corporation Optical shaft position and speed sensor
EP0942340B1 (en) * 1997-09-30 2006-09-20 Seiko Epson Corporation Rotation control apparatus and rotation control method
US6498474B1 (en) * 2001-06-27 2002-12-24 Kelsey-Hayes Company Rotational velocity and direction sensing system
FR2865501B1 (en) 2004-01-23 2006-03-10 Siemens Vdo Automotive DEVICE FOR DETERMINING THE POSITION OF AN INTERNAL COMBUSTION ENGINE
DE102004030700A1 (en) * 2004-06-25 2006-01-19 Hella Kgaa Hueck & Co. Sensor, in particular position sensor for a motor vehicle with a plurality of independently operating measuring systems
DE102005022596A1 (en) * 2005-05-17 2006-11-23 Continental Teves Ag & Co. Ohg Arrangement for intrinsically safe wheel speed detection
JP5144547B2 (en) * 2008-01-15 2013-02-13 株式会社豊田中央研究所 Detection signal processing circuit and rotation detection device having the same
JP4776654B2 (en) * 2008-04-16 2011-09-21 三菱電機株式会社 Stop determination device for internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012059637A1 *

Also Published As

Publication number Publication date
CN103228896A (en) 2013-07-31
CN103228896B (en) 2016-03-09
FI20106146A0 (en) 2010-11-02
EP2635787B1 (en) 2015-01-21
WO2012059637A1 (en) 2012-05-10
KR20140004092A (en) 2014-01-10
KR101818282B1 (en) 2018-01-12

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