WO2001006215A1 - Device for the analog or digital processing of signals - Google Patents
Device for the analog or digital processing of signals Download PDFInfo
- Publication number
- WO2001006215A1 WO2001006215A1 PCT/DE2000/002267 DE0002267W WO0106215A1 WO 2001006215 A1 WO2001006215 A1 WO 2001006215A1 DE 0002267 W DE0002267 W DE 0002267W WO 0106215 A1 WO0106215 A1 WO 0106215A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- analog
- sensor
- digital
- output
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
-
- 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
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
Definitions
- the invention relates to a device for analog or digital signal processing according to the genus
- Main claim and relates in particular to the evaluation of signals from air mass meters in internal combustion engines.
- Air mass meters currently available, for example hot film air mass meters, may in future be equipped with both analog (optional) and digital evaluation electronics. This makes it possible to simplify the characteristic curve and the temperature response. In order for an air mass meter with digital evaluation electronics to remain compatible with previous air mass meters with analog concepts, at least partially analog signal processing must be retained.
- the object of the invention is to determine the quantity to be measured, for example the air mass, from the sensor signal in digital operation, that is to say in the case of a digital signal evaluation in the sensor. This requires a time base with which the analog signal supplied by the sensor element is sampled.
- the present invention is intended to show one possibility of realizing such a signal sampling and one way of switching from digital to analog operation.
- the device according to the invention with the features of claim 1 has the advantage that particularly high accuracy is obtained in the processing of the measured values, which can advantageously be carried out analog or digital. Furthermore, the subsequent control device, for example the control unit of the internal combustion engine, is relieved of load, since the signal processing and processing is already largely implemented in the sensor. Further advantages of the invention are achieved by the measures specified in the subclaims. It is advantageous that a trigger signal is formed that serves as a time base for the signal sampling and at the same time can be used to switch between digital and analog operation of the sensor. Furthermore, the trigger signal can advantageously be supplied via the voltage supply in such a way that a cable connection between the control device and the sensor can be saved.
- FIG. 1 shows a circuit arrangement according to the invention with different trigger signals and FIG. 2 shows the signal flow using the example of a hot film air mass meter with a triggering of the air mass information by a signal supplied by the control device.
- FIG. 1 shows an exemplary embodiment of a circuit for the transmission of a trigger signal from the control device 10 to the sensor 11, for example a hot film air mass meter.
- the control unit 10 From the control unit 10, only the amplifier 12, at the output of which the reference signal Uref is generated, is shown.
- a feedback resistor 13 belongs to this amplifier.
- the inverting input of the amplifier 12 is supplied via the transistor 14 with the signal tseg, which is present in the control unit anyway.
- the signal tseg which is usually also referred to as a tn signal, has one pulse per segment. In the case of an internal combustion engine, a segment is an angular range that extends over two course at shaft revolutions divided by the number of cylinders of the internal combustion engine.
- the reference voltage Uref is at the non-inverting input of the amplifier 12.
- This wiring in the control unit produces the signal UrefS at the output of the amplifier 12, which is shown at the bottom left in FIG.
- This signal UrefS is fed to the sensor 11 via the interface 16 and the resistor 17.
- the sensor 11 comprises a sample and hold element which filters the supplied reference voltage UrefS.
- the sample and hold element comprises an amplifier 18, the voltage UrefS of which is supplied to its non-inverting input.
- the output of the amplifier 18 leads to the switching path of a transistor 19, which leads in series with a resistor 20 to the non-inverting input of an amplifier 21.
- a capacitor 22 is located between the non-inverting input of amplifier 21 and ground.
- the output of amplifier 21 is connected to the non-inverting input of amplifiers 18 and 21.
- Another amplifier 23 receives the reference signal UrefS at the non-inverting input.
- the inverting input of amplifier 23 is connected via diode 24 to the non-inverting input of amplifiers 18 and 21, and battery voltage Ubat is supplied via resistor 25.
- the segment signal Seg which is shown in the middle of FIG. 1, is produced at the output of the amplifier 23.
- This segment signal acts through the resistor 26 on the base of the transistor 19, whereby the transistor 19 is driven in the desired manner.
- the filtered reference voltage Urefg arises at the output of the amplifier 21; it is shown at the bottom right in FIG.
- FIG. 2 shows a block diagram for the signal flow in a hot film air mass meter, with a triggering of the air mass information by the control unit signal UrefS.
- the sensor itself is designated as 11 in FIG. 1 and comprises a sensor element 27 which is exposed to the air flowing in the intake manifold of the internal combustion engine. In addition to the sensor element 27, a temperature sensor 28 is also exposed to the air and measures its temperature.
- the output signal of the sensor element UA is fed to the switchover 29, with which the switchover between an analog and a digital signal evaluation takes place.
- the changeover 29 routes the output signal of the sensor element 27 to an analog / digital converter 30.
- the changeover switch 29 routes the output voltage of the sensor element 27 to an analog signal evaluation block 31, which is not described here in greater detail should be described.
- the analog signal evaluation block 30 supplies an analog output signal Ua, which is made available to the control unit 31. According to the invention, the analog signal evaluation can also be omitted; the digital evaluation described below should then deliver the same analog output signal Ua to the control unit 31.
- an output signal for example an analog output voltage Ua
- an output signal for example an analog output voltage Ua
- the digital signal converted in the A / D converter 30 is fed to the block 32, in which the air mass per segment is summed.
- the air mass per segment is calculated by dividing the total air mass by the number of measured values per segment.
- the Division takes place in block 33, counter 34 counts the number of measured values.
- the air mass calculated per segment is converted into the desired analog voltage Ua in the digital / analog converter 35.
- the switchover 29 as well as the triggering of the A / D-converted signal and the activation of the counter 34 takes place with the aid of a pulse detector 36, to which the segment information tn or the reference voltage Uref generated therefrom is supplied.
- the segment information tn is supplied by the control unit 31.
- a ground connection M and a connection TF are also shown in FIG. 2, via which the control unit 31 sets the temperature Tf of the temperature sensor 28.
- the arrow directions indicate the direction of the signal flows.
- the segment information tn or Uref can be used to achieve a signal flow in the HFM sensor with a triggering of the air mass information by the control unit, in which a uniform analog output voltage Ua is obtained, regardless of whether the evaluation is carried out analog or digital. So that the air mass can be determined from the sensor signal in digital operation, a time base is required with which the sensor signal is sampled.
- one sample per ms is customary.
- the air masses sampled in this way are added up until a segment has ended.
- one segment corresponds to 180 degrees crankshaft angle (kw).
- the air mass then results from the sum of all sampled values divided by the number of sampling points.
- the value for the air mass determined in this way is given analogously as voltage Ua.
- the procedure described below results for triggering and switching from digital to analog mode.
- the time at which the summation of the air masses should start is communicated to the air mass meter externally by the control unit 31.
- the signal tn which is already available as a trigger signal in the control unit, is fed to the air mass meter.
- the signal tn provides one pulse per segment.
- This signal is usually also used to determine the speed.
- the signal tn is fed from the control unit to the air mass meter via the voltage supply of the air mass meter and is detected by the air mass meter as a start segment (trigger). This possibility of trigger signal supply is shown in FIG. 1. An alternative would be to feed the trigger signal via the output voltage of the air mass meter.
- the air mass of the last segment is calculated and the sampling counter 34 is reset to zero.
- the information "total air masses” is also set to zero.
- the air / mass converter is converted into the corresponding output voltage Ua via the digital / analog converter 35. After the engine has started, it is known when the first impulses are received that the air mass meter should work digitally The air mass is output as an analog signal, so the supply of the tn pulses determines whether the evaluation is digital or analog.
Landscapes
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Technology Law (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Volume Flow (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001510805A JP2003504992A (en) | 1999-07-17 | 2000-07-12 | Analog or digital signal processor |
EP00954325A EP1114298A1 (en) | 1999-07-17 | 2000-07-12 | Device for the analog or digital processing of signals |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19933664.4 | 1999-07-17 | ||
DE1999133664 DE19933664A1 (en) | 1999-07-17 | 1999-07-17 | Device for analog or digital signal processing |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001006215A1 true WO2001006215A1 (en) | 2001-01-25 |
Family
ID=7915198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/002267 WO2001006215A1 (en) | 1999-07-17 | 2000-07-12 | Device for the analog or digital processing of signals |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1114298A1 (en) |
JP (1) | JP2003504992A (en) |
DE (1) | DE19933664A1 (en) |
WO (1) | WO2001006215A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004029065A1 (en) | 2004-06-16 | 2006-01-26 | Siemens Ag | Crankshaft synchronous acquisition of analog signals |
KR102463258B1 (en) * | 2020-09-25 | 2022-11-04 | 한국전자기술연구원 | Hybrid operation method and system for low power operation of ultrasonic gas meter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2262811A (en) * | 1991-12-24 | 1993-06-30 | Flow Check Services Limited | System for measuring fluid flow |
EP0606983A2 (en) * | 1993-01-12 | 1994-07-20 | Hitachi, Ltd. | Heating resistor type air flow meter |
US5520043A (en) * | 1993-07-05 | 1996-05-28 | Robert Bosch Gmbh | Device for crankshaft-synchronous detection of a periodically changing variable |
DE19711215C1 (en) * | 1997-03-18 | 1998-05-07 | Heidenhain Gmbh Dr Johannes | Method of switching between different output signal types of position measuring device |
-
1999
- 1999-07-17 DE DE1999133664 patent/DE19933664A1/en not_active Withdrawn
-
2000
- 2000-07-12 JP JP2001510805A patent/JP2003504992A/en active Pending
- 2000-07-12 WO PCT/DE2000/002267 patent/WO2001006215A1/en not_active Application Discontinuation
- 2000-07-12 EP EP00954325A patent/EP1114298A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2262811A (en) * | 1991-12-24 | 1993-06-30 | Flow Check Services Limited | System for measuring fluid flow |
EP0606983A2 (en) * | 1993-01-12 | 1994-07-20 | Hitachi, Ltd. | Heating resistor type air flow meter |
US5520043A (en) * | 1993-07-05 | 1996-05-28 | Robert Bosch Gmbh | Device for crankshaft-synchronous detection of a periodically changing variable |
DE19711215C1 (en) * | 1997-03-18 | 1998-05-07 | Heidenhain Gmbh Dr Johannes | Method of switching between different output signal types of position measuring device |
Also Published As
Publication number | Publication date |
---|---|
JP2003504992A (en) | 2003-02-04 |
EP1114298A1 (en) | 2001-07-11 |
DE19933664A1 (en) | 2001-01-18 |
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