GB2203264A - Electronic control system for a vehicle propulsion system - Google Patents
Electronic control system for a vehicle propulsion system Download PDFInfo
- Publication number
- GB2203264A GB2203264A GB08807196A GB8807196A GB2203264A GB 2203264 A GB2203264 A GB 2203264A GB 08807196 A GB08807196 A GB 08807196A GB 8807196 A GB8807196 A GB 8807196A GB 2203264 A GB2203264 A GB 2203264A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microcomputer
- propulsion system
- control system
- pulse
- control
- 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
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
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0006—Electronic control units for transmission control, e.g. connectors, casings or circuit boards
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- 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
- F16H61/02—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 characterised by the signals used
- F16H61/0202—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 characterised by the signals used the signals being electric
- F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
- F16H2061/0255—Solenoid valve using PWM or duty-cycle control
-
- 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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
-
- 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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/122—Avoiding failures by using redundant parts
-
- 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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller
- F16H2061/1268—Electric parts of the controller, e.g. a defect solenoid, wiring or microprocessor
-
- 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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/22—Pc multi processor system
- G05B2219/2208—Each processor controls a different function of the machine
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Velocity Or Acceleration (AREA)
Description
1 1 1 ELECTRONIC CONTROL SYSTEM
SPECIFICATION
0, 3 This invention relates to an electronic control system for a propulsion system, particularly for vehicles, which interacts with pulse-width-modulated components of the propulsion system.
Known systems use only a single microcomputer.
This controls non-pulse-width-modulated components.
In spite of high operational speeds of the known control devices and microcomputer. material time differences arise between the occurrence of a particular operational situation and the point in time at which specific control measures or regulating measures are taken in dependence upon the operational situation.
It is an object of the present invention substantially to reduce the time. delay which occurs between the occurrence of a specific new operational condition and the beginning of a reaction process to be carried out in dependence on that new condition. BY means of the present invention one can thus create to a substantial extent a "real time control". Also, more complex regulation curves can now be realised in acceptable times. Moreover. a certain redundancy is created which permits -the effective use of an integrated diagnostic programme.
In accordance with the present invention there is 30 provided an electronic control system for a propulsion system, particularly for vehicles, which interacts with pulse-width-modulated components of the propulsion system. wherein at least two microcomputers are connected together by data links, wherein one of said microcomputers receives desired valuii inputs providing 2 data for the desired operation of the propulsion system and controls or regulates non-pul se -width- control led components of the propulsion system in dependence thereon, and in which the other or another microcomputer controls or regulates pglse-widthcontrolled components of the propulsion system according to a control code through said one microcomputer.
By this means the other or said another microcomputer is not delayed in its reaction time by the command performance times which are necessary to create the modulation frequency and the pulse width associated therewith.
By this means one achieves a system in which upon the occurrence of a change in the operational conditions, a reaction process is initiated substantially without delay, particularly upon the need for corrective measures as a result of deviations from a desired value.
According to one preferred embodiment of the invention the control of the pulse-width-controlled components takes place in dependence upon changes in rotation per unit. time of a part or parts of the propulsion system after the transfer of the control code.
According to a further preferred feature of the invention one can provide that the pulse-width controlled components are actuated according to a pre programmed temporal control process.
According to another preferred feature of the invention it is provided that the speed of rotation of a part or parts of the propulsion system is measured both by said one microcomputer and also by the other or another microcomputer.
It may be preferable to arrange that the speed of 1 1 1 5.
3 rotation measurement is fed according to different dividing ratios to said one microcomputer and to the other or said another microcomputer. Thereby, the measured frequency which is dependent upon the speed of rotation is transformed according to the dividing ratio to a lower frequencyy which substantially eliminates geometrical deviations, for example with gear wheels, during the period of a measuring process.
Preferably, each microcomputer of the control system of the present invention includes its own error diagnostic circuit for determining faults in the control system itself and in peripheral devices, and status-function codes and error codes are continuously exchanged between the microcomputers by way of the data links.
It is desirable that each microcomputer should include an emergency programme which is effective if faults occur. Such emergency programmes can be arranged so that the propulsion system can run only up to a maximum speed of rotation or only while remaining below a specific operating temperature or the like.
The present invention results in a real reduction in the reaction time of the control device. The solution of this time problem is achieved according to the invention essentially by virtue of the fact that a number of microcomputers are provided which all work contemporaneously but according to different programmes.
Within the framework of the present invention the following terms used herein have the following definitions:
"Propulsion system": Gears; engines and motors, especially internal combustion engines, electric motors, oil engines; turbines.
"Non-pulse-width-control led components": So-called 4 black/white components which each can take up only one or other of two different switched states according to control signals. We are talking &here particularly about proportional valves, stepping motors, servo motors and similar setting components which, under the control of a signal, take up one of several possible fixed operational states.
"Pulse-width-controlled components": Components whose signals controlling them have the form of pulses, the pulse width of which varies according to the signal value. The components take up a particular operational state depending upon the width of the pulse. Such pulse-width-controlled components include for example valves and setting members whose setting value is dependent on the pulse width of the signal controlling it.
The preferred field of utilisation of the electronic control device of the present invention is for propulsion systems of road vehicles. However, such control devices can also be used for the propulsion systems of ships, aircraft and stationary apparatus.
The "desired value inputs" of said one microcomputer include signals from devices with which the propulsion system is used, particularly signals for example from the accelerator pedal, the brake pedal, from gears which are controlled manually, from a pre programmed automatically switchable transmission gear system, and from other like elements which determine the operation of the sy stem.
In order that the invention may be fully understood, one presently preferred embodiment of control system in accordance with the invention will now be described by way of example and with reference to the accompanying drawing which Is a block schematic diagram of the control system.
1 S 1 i The electronic control device shown in the drawing comprises a first microcomputer 2 and a second microcomputer 4 which are connected to each other by data links 6, which form a bi-directional data bus by means of which the two microcomputers can exchange data reciprocally. The first microcomputer 2 is connected to a device, which in the present case is a road vehicle 8, which incorporates a propulsion system 10. From the vehicle 8 there are connections to the first microcomputer 2, namely a connection from a gearchange selector 12 for the pre-programmed switching of the propulsion system 10 by way of a desired value input 14, a connection from an accelerator pedal 16 by way of a desired value input 18. and a connection from a brake pedal 20 by way of a desired value input 22.
Additionally, the microcomputer 2 is connected by means of a signal output 24 to a warning light 26 and by means of a signal output 28 to an indicating instrument on the vehicle 8.
The propulsion system 10 in this embodiment comprises a gear system which is switchable automatically under load and which is designed for an internal combustion engine, electric motor or a turbine. The propulsion system includes at least one non-pulse-width-modulated component 32 controlled by the first microcomputer 2. This can be a magnetic valve. a servo motor or a similar setting element. Preferably, at least one such component 32 is provided for each switchable gear of the propulsion system 10.
Furthermore, the propulsion system 10 includes at least one tachometer 34 which produces a frequency signal dependent upon the measured speed of rotation, with this frequency signal being fed by way of a frequency divider 36 to the first microcomputer 2 and by way of a second frequency divider 38 to the second microcomputer r k 6 4. The first frequency divider 36 divides the frequency by the factor "x" to a first lower frequency, and the second frequency divider 38 divides the frequency by a factor "y" to another lower frequency.
The frequency dependent upon the speed of rotation is consequently fed directly to both microcomputers 2 and 4, and consequently the smallest possible amount of time is lost in the frequency transmission. The two, or more than two, independent frequency inputs can also be used for diagnostic purposes. A temperature sensor 40 and a pressure switch 42 are likewise connected to the first microcomputer 2 and give their operational values of the propulsion system 10. obviously. a plurality of temperature sensors 40 and pressure switches 42 could alternatively be provided. The temperature sensor could be used for the measurement of the temperature of oil which serves for lubrication and cooling in the propulsion system. Furthermore. it could serve for the temperature measurement of other cooling liquids. The pressure switch or switches 42 could serve for the measurement of the oil pressure or for the measurement of cooling liquids and other-pressures.
The tachometer 34, temperature sensor 40 and 25 pressure switch 42 provide real value outputs from the propulsion system. In dependence upon these real values, and In dependence upon the desired values on the desired value inputs 14, 18, 22, the microcomputer 2 controls or regulates the non-pulse-width-modulated components 32 and the second microcomputer 34 controls pulse-width- modulated components 46 of the propulsion system 10. Such pulse-width- modulated components 46 of the propulsion system 10 could be flow valves which open and close to a greater or lesser extent depending upon the width of the pulses.
-1 If 7 The two microcomputers 2 and 4 contain programmes for the mutual transfer of information as to function status, for determining and transmitting information concerning errors or defects, and for operating the whole system in accordance with emergency programmes when faults occur. For this purpose. at least one emergency programme is contained in each microcomputer 2 and 4.
8
Claims (8)
1. An electronic control system f or a propulsion system, particularly for vehicles, which interacts with pulse-width-modulated components of the propulsion system, in which at least two microcomputers are connected together by data links, in which one of said microcomputers receives desired value inputs providing data for the desired operation of the propulsion system and controls or regulates non-pulse-width-control led components of the propulsion system in dependence thereon, and in which the other or another microcomputer controls or regulates pulse-widthcontrolled components of the propulsion system according to a control code through said one microcomputer.
2. A control system according to claim 1, in which the control of the pulse-width-controlled components is effected in dependence upon changes in rotation per unit time of a part or parts of the propulsion system after the transfer of the control code.
3. A control system according to claim 1, in which the pulse-widthcontrolled components are actuated according to a pre-programmed temporal control process.
4. A control system according to any preceding claim, in which the speed of rotation of a part or parts of the propulsion system is measured both by said one microcomputer and also by the other or another microcomputer.
5. A control system according to claim 4, in which the measured speeds of rotation are fed to said one microcomputer and to the other or another microcomputer according to different dividing ratios.
1 1 9
6. A control system according to any preceding claim, in which each microcomputer includes its own fault diagnosis circuit for the determination of faults in itself and in peripheral apparatus, and in which status function codes and error codes are exchanged continuously between the microcomputers by way of the data links.
7. A control system according to any preceding claim, in which each microcomputer includes an emergency programme which is effective when faults occur.
8. An electronic control system substantially as hereinbefore described with reference to the accompanying drawing.
PubUBhed 1988 at The Patent Office, State Home, CW 1 Holborn, London WC 1R 4Tp. Further copies may be obtained from The Patent Office. Sales Branch St Mary Cray, orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary, Kent. CO- 1187.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873711467 DE3711467A1 (en) | 1987-04-04 | 1987-04-04 | ELECTRONIC CONTROL DEVICE |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8807196D0 GB8807196D0 (en) | 1988-04-27 |
GB2203264A true GB2203264A (en) | 1988-10-12 |
GB2203264B GB2203264B (en) | 1991-05-08 |
Family
ID=6324919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8807196A Expired - Lifetime GB2203264B (en) | 1987-04-04 | 1988-03-25 | Electronic control system |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3711467A1 (en) |
GB (1) | GB2203264B (en) |
IT (1) | IT1217381B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0373849A2 (en) * | 1988-12-12 | 1990-06-20 | Diesel Kiki Co. Ltd. | Automatic control system for gear transmission |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130760A (en) * | 1982-11-15 | 1984-06-06 | Nissan Motor | Air-fuel ratio control system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3448640A (en) * | 1967-06-30 | 1969-06-10 | Gen Motors Corp | Electrical control for automatic transmission |
US4283970A (en) * | 1979-07-02 | 1981-08-18 | General Motors Corporation | Automatic transmission line pressure control |
GB2126291B (en) * | 1982-07-12 | 1985-12-18 | Honda Motor Co Ltd | Method of controlling a creep preventing device for a vehicle equipped with automatic transmission |
DE3313688A1 (en) * | 1983-04-15 | 1984-10-25 | Zahnräderfabrik Renk AG, 8900 Augsburg | ELECTRONIC CONTROL DEVICE FOR A DRIVE SYSTEM |
DE3341652A1 (en) * | 1983-11-18 | 1985-06-05 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | METHOD AND DEVICE FOR CONTROLLING A CLUTCH GEAR UNIT |
-
1987
- 1987-04-04 DE DE19873711467 patent/DE3711467A1/en active Granted
-
1988
- 1988-03-25 GB GB8807196A patent/GB2203264B/en not_active Expired - Lifetime
- 1988-03-28 IT IT20000/88A patent/IT1217381B/en active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130760A (en) * | 1982-11-15 | 1984-06-06 | Nissan Motor | Air-fuel ratio control system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0373849A2 (en) * | 1988-12-12 | 1990-06-20 | Diesel Kiki Co. Ltd. | Automatic control system for gear transmission |
EP0373849A3 (en) * | 1988-12-12 | 1991-08-07 | Diesel Kiki Co. Ltd. | Automatic control system for gear transmission |
Also Published As
Publication number | Publication date |
---|---|
DE3711467C2 (en) | 1991-04-11 |
DE3711467A1 (en) | 1988-10-20 |
GB8807196D0 (en) | 1988-04-27 |
GB2203264B (en) | 1991-05-08 |
IT8820000A0 (en) | 1988-03-28 |
IT1217381B (en) | 1990-03-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940325 |