GB2056592A - Circuit arrangement of an electronic circuit for forming and changing the hysteresis in case of switching gear stages of automatic gearings. - Google Patents
Circuit arrangement of an electronic circuit for forming and changing the hysteresis in case of switching gear stages of automatic gearings. Download PDFInfo
- Publication number
- GB2056592A GB2056592A GB8016926A GB8016926A GB2056592A GB 2056592 A GB2056592 A GB 2056592A GB 8016926 A GB8016926 A GB 8016926A GB 8016926 A GB8016926 A GB 8016926A GB 2056592 A GB2056592 A GB 2056592A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- hysteresis
- over
- transistor
- resistance
- 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- Withdrawn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
- XDDAORKBJWWYJS-UHFFFAOYSA-N glyphosate Chemical compound OC(=O)CNCP(O)(O)=O XDDAORKBJWWYJS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 abstract description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/10—Controlling shift hysteresis
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Transmission Device (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Manipulation Of Pulses (AREA)
- Electronic Switches (AREA)
Abstract
The circuit is intended to be substantially independent of variations of ambient temperature, with the possibility of achieving a low hysteresis without danger of generating oscillations particularly at "kick-down" conditions, whereby switching points at "zero gas" are not shifted due to hysteresis in dependence on the position of a control element of fuel supply. A vehicle speed signal is applied through a resistor R1 to the non-inverting input of an amplifier 2 the output of which controls a ratio shift switch 3. The inverting input of the amplifier is connected to a reference voltage divider and to the collector of a transistor T the emitter of which is connected to a potentiometer P coupled with the engine fuel control 4. The base of the transistor is connected to the output and to the non-inverting input of the amplifier and also to a kick-down switch S. <IMAGE>
Description
SPECIFICATION
Circuit arrangement of an electronic circuit for forming and changing the hysteresis in case of switching gear stages of automatic gearings
The invention relates to a circuit arrangement of a circuit for forming the hysteresis between switching of higher and lower gear stages of automatic gearings, for the change of this hysteresis in dependence on the position of a control element of the fuel supply and for its reduction at "kick-down" tondi tions.
The Schmitt flip-flop circuit is at actually known circuit arrangements generally applied for this purpose, where it is possible to adjust and change the hysteresis by means of several circuit elements.
Differential amplifiers are furthermore known, on one input of which a voltage from a reference voltage divider for switching of higher stages and a voltage from another reference divider for switching a lower stage are supplied, whereby a voltage proportional to the vehicle speed is supplied to a second input of the amplifier. The reduction of the hysteresis at "kick-down" conditions is accomplished for instance by an instantaneous voltage reduction on the second input of the differential amplifier or by increase of the voltage of the reference divider for switching a lower stage. The application of a working amplifier as comparator for switching a gear stage without reducing the hysteresis at "kick-down" conditions in dependence on the position of a control element of fuel supply is also known.
A drawback of some mentioned systems is the substantial dependence of their parameters on variations of ambient temperature. At circuit arrangementswith a differential amplifier with reference voltage dividers, a low hysteresis can be obtained with difficulties only, particularly at "kick-down" conditions. The circuit can show a tendency for generating oscillations. The low input resistance of the amplifier requires at a multistage gearing the introduction of a temperature dependent emitter follower. A change of the hysteresis in dependence on the position of the regulating element of fuel supply can be achieved at a limited degree and an increase of the hysteresis at "full gas" shifts the switching points at "zero gas" in direction of the higher vehicle speed.An instantaneous voltage reduction on the input of the amplifier or comparator at "kick-down" conditions is transmitted to the power switch as an impulse of short duration, what is in many cases unwelcomed for reason of operation.
It is an object of this invention to eliminate these drawbacks and to provide an electronic circuit arrangement of this kind which would be substantially independent on variations of ambient temperature, have a low hysteresis without danger of generating oscillations and a high output resistance.
According to this invention the not inverting input of a working amplifier is connected via a resistance to the output of a circuit for measuring the vehicle speed and over a resistance to the output of the working amplifier, connected itself over a Zenerdiode to the input of a switch for electromagnetic speed stage control and over a resistance to the base of a transistor, which is itself connected also over a diode and a kick-down switch with the lower branch of the feeding voltage, whereby the emitter of the transistor is connected both over a resistance with the lower branch of the feeding voltage and with a slider of a potentiometer, mechanically coupled with a control element of fuel supply. The emitter of the transistor can be furthermore connected by way of a
Zener-diode or over a resistance with the slider of the potentiometer.
An advantage of the circuit arrangement according to this invention is the negligible influence of variations of ambient temperature on parameters of the circuit. A very low hysteresis can be obtained, particularly at "kick-down" conditions without danger that the circuit would start to oscillate. The input resistance of the circuit according to this invention is high, it does not therefore represent a load of the circuit for measuring the vehicle speed. Another advantage is that the hysteresis does not shift the switching points at "zero gas" in dependence on the position of the control element for fuel supply.
An examplary embodiment of a circuit arrangement according to this invention is indicated in the attached drawing.
The switching point is in the circuit according to this invention determined by the voltage of a reference divider, which voltage is brought to the inverting input of a working amplifier 2, which operates as voltage comparator. At the moment where the output voltage of a circuit for measuring the vehicle speed brought via a resistance R1 to the not inverting input of the working amplifier2 overtops the voltage of the reference divider, the circuit is triggered and the generated positive voltage on the output opens the transistor T and the switch 3 for electromagnetic speed stage control. A drop of the input voltage below the value determined by the reference voltage reduced for the hysteresis of the circuit brings about a back triggering of the circuit and a closing of the transistor T and of the switch 3.The hysteresis of the comparator is directly proportional to the voltage difference of the collector of the transistor Tin a closed and opened condition. By closing the "kick-down" switch S the transistorT is closed and annulates the hysteresis. A certain minimum hysteresis at "kick-down" conditions can be adjusted by the resistance R2. The voltage on the collector of the transistor Tin the opened condition and thus the hysteresis of the circuit can be furthermore changed in dependence on the position of the slider of the potentiometer P, which is mechanically coupled with the control element 4 for fuel supply. By movement of the slider of the potentiometer P in direction toward the lower feeding branch, the voltage drop on the resistance
R4 is decreased, the voltage on the collector of the transistor T drops and the hysteresis is increased.
The voltage difference between the slider of the potentiometer P and the emitter of transistor T required from the point of view of operation is generated by the Zener-diode D3, which can be in some cases replaced by a resistance R5. The Zenerdiode D1 and the resistance R3 are compensating the output voltage ofthe comparator prior to triggering when feeding the working amplifier without an auxiliar source of negative voltage. The
Zener-diode D1 can be replaced by a series combination of diodes. In a circuit with an auxiliar source of negative voltage the diode D1 can be eliminated. The diode D2 enables a parallel connection of the same circuit to a common "kick-down" switch S.
Claims (4)
1. Circuit arrangement of an electroniccircuitfor forming and changing the hysteresis in case of switching gear stages of automatic gearings of vehicles, comprising a circuit for measuring the vehicle speed, a working amplifier with an inverting and not inverting input, a potentiometer with a slider, mechanically coupled with a control element of fuel supply, a transistor, a switch for the electromagnetic speed stage control, a voltage reference divider, a kick-down switch, a feeding voltage with an upper and lower branch, a Zener diode and a number of diodes and resistances, the inverting input of the working amplifier being connected both over resistances to the center of the reference voltage divider and to the transistor collector, which is connected over a resistance to the upper branch of the feeding voltage, the not inverting input of the working amplifier being connected to the output of the circuit for measuring the vehicle speed and via a resistance to the output of the working amplifier, itself connected both over a Zener diode to the input of the switch for electromagnetic speed stage control and over a resistance to the transistor base, which itself is connected over a diode and the kick-down switch with the lower branch of the feeding voltage, whereby the transistor emitter is connected both over a resistance with the lower branch of the feeding voltage and with the slider of the potentiometer, mechanically coupled with the control element for fuel supply.
2. Circuit arrangement as claimed in claim 1, comprising an additional Zener diode, the transistor emitter being connected over said additional Zener diode with the slider of the potentiometer.
3. Circuit arrangement as claimed in claim 1, the transistor emitter being connected over a resistance with the slider of the potentiometer.
4. Circuit arrangement of an electronic circuit for forming and changing the hysteresis in case of switching gear stages of automatic geatings of vehicles, substantially as described, with reference to the attached drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS795198A CS217051B1 (en) | 1979-07-26 | 1979-07-26 | Connection of elements of electronic circuit for production and alteration of hysteresis by shifting the gears of automatic gear boxes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2056592A true GB2056592A (en) | 1981-03-18 |
Family
ID=5396412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8016926A Withdrawn GB2056592A (en) | 1979-07-26 | 1980-05-22 | Circuit arrangement of an electronic circuit for forming and changing the hysteresis in case of switching gear stages of automatic gearings. |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5621921A (en) |
| AT (1) | AT366325B (en) |
| CS (1) | CS217051B1 (en) |
| DE (1) | DE3024065A1 (en) |
| FR (1) | FR2462621A1 (en) |
| GB (1) | GB2056592A (en) |
| IT (1) | IT1209250B (en) |
| SE (1) | SE8005344L (en) |
| SU (1) | SU1067600A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3223555C2 (en) * | 1982-06-24 | 1987-02-05 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | Control system for a motor vehicle drive unit |
| JP4919202B2 (en) * | 2005-08-18 | 2012-04-18 | 三菱農機株式会社 | Threshing device |
-
1979
- 1979-07-26 CS CS795198A patent/CS217051B1/en unknown
-
1980
- 1980-04-08 SU SU807771148A patent/SU1067600A1/en active
- 1980-05-22 GB GB8016926A patent/GB2056592A/en not_active Withdrawn
- 1980-06-17 AT AT0319180A patent/AT366325B/en not_active IP Right Cessation
- 1980-06-26 DE DE19803024065 patent/DE3024065A1/en not_active Withdrawn
- 1980-07-18 FR FR8015946A patent/FR2462621A1/en not_active Withdrawn
- 1980-07-23 SE SE8005344A patent/SE8005344L/en not_active Application Discontinuation
- 1980-07-24 IT IT8023678A patent/IT1209250B/en active
- 1980-07-25 JP JP10142180A patent/JPS5621921A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SU1067600A1 (en) | 1984-01-15 |
| DE3024065A1 (en) | 1981-02-19 |
| IT1209250B (en) | 1989-07-16 |
| ATA319180A (en) | 1981-08-15 |
| AT366325B (en) | 1982-04-13 |
| SE8005344L (en) | 1981-01-27 |
| JPS5621921A (en) | 1981-02-28 |
| FR2462621A1 (en) | 1981-02-13 |
| IT8023678A0 (en) | 1980-07-24 |
| CS217051B1 (en) | 1982-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |