GB2117938A - Current driver circuit for an electric-mechanical adjuster - Google Patents
Current driver circuit for an electric-mechanical adjuster Download PDFInfo
- Publication number
- GB2117938A GB2117938A GB08308437A GB8308437A GB2117938A GB 2117938 A GB2117938 A GB 2117938A GB 08308437 A GB08308437 A GB 08308437A GB 8308437 A GB8308437 A GB 8308437A GB 2117938 A GB2117938 A GB 2117938A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- operational amplifier
- driver circuit
- transistor
- wired
- 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
Links
- 238000003384 imaging method Methods 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
- G05D3/14—Control of position or direction using feedback using an analogue comparing device
- G05D3/18—Control of position or direction using feedback using an analogue comparing device delivering a series of pulses
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D2011/108—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type with means for detecting or resolving a stuck throttle, e.g. when being frozen in a position
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electronic Switches (AREA)
- Measurement Of Current Or Voltage (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Amplifiers (AREA)
Abstract
In a retroactive control circuit for the coil current of an electromechanical adjuster, the control voltage acts by way of a buffer operational amplifier (O1), upon a second operational amplifier (O2) which is wired as an integrating controller and whose negative input is connected both to the negative input of a third operational amplifier (O3), wired as a comparator, and also to a resistor (R16) located in the output circuit of a current-imaging circuit. A fourth operational amplifier (O4), wired as an oscillator, supplies to the positive input of the integrating controller (O2) a square-wave voltage at a frequency to which the adjuster cannot respond, and which has an amplitude slightly greater than the hysteresis. <IMAGE>
Description
SPECIFICATION
Current driver circuit for an electro-mechanical adjuster
The invention relates to a current driver circuit for an electro-mechanical adjuster whose pulsating coil current is measured and is determined by a control voltage.
Electro-mechanical adjusters generally have a non-linear current/force or current/torque characteristic and almost always exhibit mechanical and/or magnetic hysteresis.
An object of the invention is to provide a current driver circuit which supplies a current which flows through the coil of the electromechanical adjuster and which is proportional to a control voltage and also enabies elimination of hysteresis effects.
In accordance with the present invention there is provided a current driver circuit for an electromechanical adjuster whose coil current is measured and is determined by a control voltage which acts by way of a first operational amplifier, wired as an impedance transducer, upon a second operational amplifier which is wired as an integrating controller and whose negative input is connected both to the negative input of a third operational amplifier, wired as a comparator, and also to a resistor located in the output circuit of a current-imaging circuit, a fourth operational amplifier, wired as an oscillator, being arranged to supply to the positive input of the second operational amplifier a square-wave voltage whose frequency lies below the resonant frequency of the adjuster and which has an amplitude which is slightly greater than its hysteresis.
The invention will be further described hereinafter, by way of example only with reference to the accompanying drawings, wherein:
Figs. 1 to 3 are graphs used to illustrate the operation of a current driver circuit in accordance with the present invention; and
Figs. 4 to 6 are circuit diagrams of three embodiments of current driver circuits in accordance with the invention.
Referring first to the circuit diagram of Figure 4, the coil of an electro-mechanical adjuster (otherwise not illustrated is designated L and is located between a measuring resistor R15 connected directly to the positive lead 10 and the two collectors of a bipolar Darlington transistor
T2 which is used as an electronic power switch and whose emitter is connected to the negative lead 11 connected to the negative pole of an accumulator battery (not illustrated).The
Darlington device T2 becomes conductive and non-conductive again in rapid succession, with a current iflowing through the coil Land, as a result of the free-running diode D3, hunts about a desired value 12 (see Fig. 1) with an amplitude LH The average value 1 2 with respect to time of the current iflowing through the coil L can be adjusted to a desired value by means of a control voltage Ue which is applied to the positive input of an operational amplifier 01, wired as an impedance transducer, by way of a voltage divider comprising a series resistor R20 and a shunt resistor R1 The operational amplifier 01 is in the form of an integrated circuit and is commercially available under the designation LM 2902.By virtue of the specified wiring, it can be used as an integrating controller as in the case of the second operational amplifier 02, or as a comparator in the case of the operational amplifier 03, or as an oscillator in the case of the operational amplifier 04.
The intended use of the illustrated current driver circuit makes it necessary to ensure shortcircuit strength to earth and, consequently, the measuring resistor R1 5 is connected to the positive lead 10. The signal corresponding to the magnitude of the current i has to be related to earth. Hence, a current-imaging circuit SS having a transistor array comprising four transistors T3,
T4, T5 and T6 is provided which supplies the control resistor R16 with a voltage proportional to the coil current i.
The voltage produced on the control resistor R1 6 is fed directly to the negative input of the comparator 03, and to the negative input of the integrating controller 02 by way of a resistor R8.
As is shown in the graph of Figure 2, the electromotive or electromagnetic adjusting force M of the adjuster has a hysteresis indicated by the
curve 14 and the curve 15, the curve 1 5 requiring a higher current value iwhen the current is increasing than in the case of the characteristic, indicated by the curve 14, when the value of the current i is dropping. In order to avoid this hysteresis, an oscillatory effect indicated at 1 6 is provided and produced by superimposing on the oscillator signal illustrated in Fig. 1 a square-wave oscillation whose range H and frequency are constant and can be optimally adapted on the adjuster. This vibratory effect is supplied by the fourth operational amplifier 04. The amplitude H of this square-wave oscillation must be just sufficient to overcome the hysteresis.The frequency of the square-wave oscillation must be only sufficiently high for the adjuster still not to be able to follow it, that is to say, it must be lower than the resonant frequency of the adjuster. The mechanical effect is a drastic reduction of the hysteresis with a very small range of the moment
M.
In the illustrated embodiment, a carbon film resistor R25 of approximately 47 Ohms is connected between the earth lead 13, effective for all the operational amplifiers 01 to 04, and the earth lead 11 connected to the emitter of the
Darlington device T2. This has the advantage that insensitivity to long leads between the signal source Ue and the current driver SS is achieved, since no troublesome voltage drop can be produced on the signal earth. This avoids the earth loop between signal earth and coil current
earth.
In the modified embodiment of the power stage of Figure 5, a driver transistor T8 is connected in series with the power transistor T7 and is activated by way of the resistor R1 1 and acts directly upon the base of the transistor T7.
In the embodiment of Figure 6, a SIPMOS transistor T9 is provided as a power output stage for the current if lowing through the coil L, and its through gate G is connected by way of the resistor R1 1 to the output of the third operational amplifier 03, to the negative lead 11 by of a Zener diode Z1, and to the positive input of the third operational amplifier 03 by way of a resistor R1 0.
The current-imaging circuit SS shown on the right of the SIPMOS transistor T9 corresponds to that of Figure 4 in all essential points.
Claims (6)
1. A current driver circuit for an electromechanical adjuster whose coil current is measured and is determined by a control voltage which acts by way of a first operational amplifier, wired as an impedance transducer, upon a second operational amplifier which is wired as an integrating controller and whose negative input is connected both to the negative input of a third operational amplifier, wired as a comparator, and also to a resistor located in the output circuit of a current-imaging circuit, a fourth operational amplifier, wired as an oscillator, being arranged to supply to the positive input of the second operational amplifier a square-wave voltage whose frequency lies below the resonant frequency of the adjuster and which has an amplitude which is slightly greater than its hysteresis.
2. A current driver circuit as claimed in claim 1, wherein a coupling resistor is disposed between the earth lead common to the operational amplifiers and an earth lead for the currentimaging circuit.
3. A current driver circuit as claimed in claim 1 or 2, wherein a Darlington transistor, preferably a bipolar Darlington transistor, is provided for supplying the current (i) flowing through the coil (L) of the adjuster.
4. A current driver circuit as claimed in claim 1 or 2, where n-p-n power transistor is provided for supplying the current (i) flowing through the coil (L), the base of which transistor is connected to the positive lead by way of the emitter-collector path of a p-n-p driver transistor, whose base is connected to the output of said third operational amplifier.
5. A current driver circuit as claimed in claim 1 or 2, wherein a SIMPOS transistor is provided for supplying the current (i) flowing through the coil (L), the controlled electrode (G) of which transistor is connected to the earth (negative) lead by way of a Zener diode.
6. A current driver circuit, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823212942 DE3212942A1 (en) | 1982-04-07 | 1982-04-07 | POWER DRIVER CIRCUIT FOR AN ELECTROMECHANICAL ACTUATOR |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8308437D0 GB8308437D0 (en) | 1983-05-05 |
| GB2117938A true GB2117938A (en) | 1983-10-19 |
| GB2117938B GB2117938B (en) | 1986-02-26 |
Family
ID=6160450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08308437A Expired GB2117938B (en) | 1982-04-07 | 1983-03-28 | Current driver circuit for an electric-mechanical adjuster |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3212942A1 (en) |
| FR (1) | FR2524993B1 (en) |
| GB (1) | GB2117938B (en) |
| IT (1) | IT1194563B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3819482A4 (en) * | 2018-08-08 | 2021-12-15 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Control device, exhaust gas purification system, and control method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3434644A1 (en) * | 1984-09-21 | 1986-04-03 | Vdo Adolf Schindling Ag, 6000 Frankfurt | METHOD AND DEVICE FOR GENERATING A CLOCKED OPERATING VOLTAGE |
| US7848126B2 (en) * | 2007-08-21 | 2010-12-07 | Infineon Technologies Ag | Integrating current regulator and method for regulating current |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2642753A1 (en) * | 1976-09-23 | 1978-03-30 | Vdo Schindling | Electrical controller for vehicle speed - has comparator receiving actual and desired speed control signals and actuating pneumatic control system |
| SE434573B (en) * | 1979-10-02 | 1984-07-30 | Bofors Ab | SET AND DEVICE TO HIGHLINE LINERITY OF A SERVOS SYSTEM |
| DE2950692A1 (en) * | 1979-12-17 | 1981-07-02 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR CONTROLLING THE ELECTRICAL ELECTRICITY BY AN INDUCTIVE CONSUMER, IN PARTICULAR BY A FUEL MEASURING VALVE IN AN INTERNAL COMBUSTION ENGINE |
-
1982
- 1982-04-07 DE DE19823212942 patent/DE3212942A1/en active Granted
-
1983
- 1983-03-28 GB GB08308437A patent/GB2117938B/en not_active Expired
- 1983-03-31 IT IT20402/83A patent/IT1194563B/en active
- 1983-04-07 FR FR8305707A patent/FR2524993B1/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3819482A4 (en) * | 2018-08-08 | 2021-12-15 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Control device, exhaust gas purification system, and control method |
| US11441472B2 (en) | 2018-08-08 | 2022-09-13 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Control device, exhaust gas purification system, and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8308437D0 (en) | 1983-05-05 |
| IT1194563B (en) | 1988-09-22 |
| FR2524993A1 (en) | 1983-10-14 |
| FR2524993B1 (en) | 1988-05-06 |
| DE3212942C2 (en) | 1990-10-04 |
| DE3212942A1 (en) | 1983-10-13 |
| IT8320402A0 (en) | 1983-03-31 |
| GB2117938B (en) | 1986-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950328 |