GB2120410A - Control system for an internal combustion engine - Google Patents

Control system for an internal combustion engine Download PDF

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Publication number
GB2120410A
GB2120410A GB08310100A GB8310100A GB2120410A GB 2120410 A GB2120410 A GB 2120410A GB 08310100 A GB08310100 A GB 08310100A GB 8310100 A GB8310100 A GB 8310100A GB 2120410 A GB2120410 A GB 2120410A
Authority
GB
United Kingdom
Prior art keywords
engine
memory
control system
pump
words
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Withdrawn
Application number
GB08310100A
Other versions
GB8310100D0 (en
Inventor
Alistair John Forster Ritchie
Anthony John Adey
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB08310100A priority Critical patent/GB2120410A/en
Publication of GB8310100D0 publication Critical patent/GB8310100D0/en
Publication of GB2120410A publication Critical patent/GB2120410A/en
Withdrawn legal-status Critical Current

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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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

A control system for an internal combustion engine includes a processing unit 10 having a first memory 15 in which is stored the operating program for the processing unit and a second memory 16 which contains engine operating data. The two memories each contain an identification word or words which can be compared to make sure that the two programs are compatible. The second memory 16 may be a plug-in device. <IMAGE>

Description

SPECIFICATION Control system for an internal combustion engine This invention relates to a control system for an internal combustion engine, the control system including a central processing unit, a first memory in which is stored the operating program required for operation of the processing unit and a second memory in which is stored data relative to the operation of a particular engine.
The second memory will be of the plug-in type so that the control system can be utilized to control different types of engine by using the appropriate memory. It is necessary to ensure however that the information in the second memory is compatible with the program contained in the first memory otherwise malfunction of the associated engine may occur.
The object of the present invention is to provide a control system of the kind specified in a simple and convenient form.
According to the invention in a control system of the kind specified each memory contains at a specified location or locations, an indentification word or words, said locations being read and the identification words compared at least each time an attempt is made to start the engine.
An example of an engine control system in accordance with the invention will now be described with reference to the accompanying block diagram.
The system comprises a central processing unit 10 having an associated input/output unit 11.
Engine operating information such for example as speed, position and demand is supplied to the input/output unit through appropriate interface or decoding units shown collectively at 12.
The fuel pump which supplies fuel to the engine, is controllable by actuators 13 one of which will control the amount of fuel supplied by the pump and the other of which may control the timing of fuel delivery. The actuators 13 are powered by drive circuits respectively shown collectively at 14, the drive circuits being controlled from the central processing unit through the input/output unit 11. It will be understood that the system as described is much simplified and a practical system would include provision for checking the pump output and timing.
Associated with the central processing unit is a first memory 1 5 in which is stored the operating program required for operation of the processing unit. A second memory 1 6 is provided in which is stored test data etc. relative to the operation of a particular type of engine. The memories 15 and 16 are "Read Only" memories, but a third memory 17 is provided this being a "Random Access" memory which is utilized during the operation of the processing unit for the temporary storage of information.
The data stored in the memory 1 6 is relevant to a particular engine type but it will be understood that the operating program in the memory 1 5 may be able to control the operation of several types of engine. The memory 1 6 is therefore of the plug-in type so that the control system can be used with different types of engine by plugging in the appropriate memory. It may however be the case that the operating program in the first memory 1 5 may not be suitable for a particular type of engine and that therefore the operating program is not compatible with the data in the memory 1 6. If an attempt were made to operate the control system in this situation the engine could suffer damage.
In order to avoid this possibility it is arranged that each time an attempt is made to start the engine a check is made to ensure that the operating program and stored data are compatible. In accordance with the invention each memory 15, 1 6 is provided at a specific memory location with an identification word or words and these words are read out of the memories and compared before the engine starting sequence is allowed to continue. If the identification words do not correspond indicating a lack of compatibility, the processor will not take control of the fuel pump and therefore the engine, and the normal starting sequence will be halted.In this event the fuel pump may be put into a low output mode which will enable it to provide sufficient fuel to the engine to enable the latter to run at low power for the purpose of moving for example a vehicle, powered by the engine. On the other hand if the words do correspond the starting sequence is wallowed to continue.
The identification word or words may just be formulated as such, on the other hand they may be formulated in a manner to indicate the nature of the stored data.
An additional compatibility check can be made during the starting sequence and possibly during operation of the engine to ensure that the plug-in memory is also compatible with the pump and the engine.
The plug-in memory will contain information as to the number of engine cylinders and this information can be compared with information gained during operation of the engine and/or pump.
The engine in order that an engine speed signal can be supplied to the control system, will be provided with a transducer which detects the passage of marks on a rotary part of the engine or pump. The number of pulses which occur in the signal from the transducer between successive signals provided by another transducer on the engine or on the pump can be used to identify the engine and pump. The number of pulses which should occur is stored in the plug-in memory and can be compared with the actual number.
In the event that a lack of compatibility is detected then the engine starting sequence is halted or if the engine is running it will be shut down or the fuel pump put into the low output mode.
1. A control system for an internal combustion
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Control system for an internal combustion engine This invention relates to a control system for an internal combustion engine, the control system including a central processing unit, a first memory in which is stored the operating program required for operation of the processing unit and a second memory in which is stored data relative to the operation of a particular engine. The second memory will be of the plug-in type so that the control system can be utilized to control different types of engine by using the appropriate memory. It is necessary to ensure however that the information in the second memory is compatible with the program contained in the first memory otherwise malfunction of the associated engine may occur. The object of the present invention is to provide a control system of the kind specified in a simple and convenient form. According to the invention in a control system of the kind specified each memory contains at a specified location or locations, an indentification word or words, said locations being read and the identification words compared at least each time an attempt is made to start the engine. An example of an engine control system in accordance with the invention will now be described with reference to the accompanying block diagram. The system comprises a central processing unit 10 having an associated input/output unit 11. Engine operating information such for example as speed, position and demand is supplied to the input/output unit through appropriate interface or decoding units shown collectively at 12. The fuel pump which supplies fuel to the engine, is controllable by actuators 13 one of which will control the amount of fuel supplied by the pump and the other of which may control the timing of fuel delivery. The actuators 13 are powered by drive circuits respectively shown collectively at 14, the drive circuits being controlled from the central processing unit through the input/output unit 11. It will be understood that the system as described is much simplified and a practical system would include provision for checking the pump output and timing. Associated with the central processing unit is a first memory 1 5 in which is stored the operating program required for operation of the processing unit. A second memory 1 6 is provided in which is stored test data etc. relative to the operation of a particular type of engine. The memories 15 and 16 are "Read Only" memories, but a third memory 17 is provided this being a "Random Access" memory which is utilized during the operation of the processing unit for the temporary storage of information. The data stored in the memory 1 6 is relevant to a particular engine type but it will be understood that the operating program in the memory 1 5 may be able to control the operation of several types of engine. The memory 1 6 is therefore of the plug-in type so that the control system can be used with different types of engine by plugging in the appropriate memory. It may however be the case that the operating program in the first memory 1 5 may not be suitable for a particular type of engine and that therefore the operating program is not compatible with the data in the memory 1 6. If an attempt were made to operate the control system in this situation the engine could suffer damage. In order to avoid this possibility it is arranged that each time an attempt is made to start the engine a check is made to ensure that the operating program and stored data are compatible. In accordance with the invention each memory 15, 1 6 is provided at a specific memory location with an identification word or words and these words are read out of the memories and compared before the engine starting sequence is allowed to continue. If the identification words do not correspond indicating a lack of compatibility, the processor will not take control of the fuel pump and therefore the engine, and the normal starting sequence will be halted.In this event the fuel pump may be put into a low output mode which will enable it to provide sufficient fuel to the engine to enable the latter to run at low power for the purpose of moving for example a vehicle, powered by the engine. On the other hand if the words do correspond the starting sequence is wallowed to continue. The identification word or words may just be formulated as such, on the other hand they may be formulated in a manner to indicate the nature of the stored data. An additional compatibility check can be made during the starting sequence and possibly during operation of the engine to ensure that the plug-in memory is also compatible with the pump and the engine. The plug-in memory will contain information as to the number of engine cylinders and this information can be compared with information gained during operation of the engine and/or pump. The engine in order that an engine speed signal can be supplied to the control system, will be provided with a transducer which detects the passage of marks on a rotary part of the engine or pump. The number of pulses which occur in the signal from the transducer between successive signals provided by another transducer on the engine or on the pump can be used to identify the engine and pump. The number of pulses which should occur is stored in the plug-in memory and can be compared with the actual number. In the event that a lack of compatibility is detected then the engine starting sequence is halted or if the engine is running it will be shut down or the fuel pump put into the low output mode. CLAIMS
1. A control system for an internal combustion engine including a central processing unit, a first memory in which is stored the operating program required for operation of the processing unit, a second memory in which is stored data relative to the operation of a particular engine, each memory containing at a specific location or locations, an identification word or words, said locations being read and the identification words compared at least each time at attempt is made to start the engine.
2. A control system according to Claim 1 in which said second memory is a plug-in memory.
3. A control system according to Claim 1 in which the engine includes a fuel pump, the quantity of fuel delivered by the pump being controlled by the control system, said system in the event of non-compatibility between said word or words acting to halt the normal engine starting sequence.
4. A control system according to Claim 1 in which in the event of non-compatibility of said word or words the fuel pump is placed in a low output mode to enable starting of the engine to take place and operation of the engine at low power.
5. A control system according to Claim 1 in which said second memory includes engine identification data, said data in use, being compared with data received from the associated engine during operation.
6. a control system for an internal combustion engine substantially as hereinbefore described with reference to the accompanying drawing.
GB08310100A 1982-05-19 1983-04-14 Control system for an internal combustion engine Withdrawn GB2120410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08310100A GB2120410A (en) 1982-05-19 1983-04-14 Control system for an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8214554 1982-05-19
GB08310100A GB2120410A (en) 1982-05-19 1983-04-14 Control system for an internal combustion engine

Publications (2)

Publication Number Publication Date
GB8310100D0 GB8310100D0 (en) 1983-05-18
GB2120410A true GB2120410A (en) 1983-11-30

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Family Applications (1)

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GB08310100A Withdrawn GB2120410A (en) 1982-05-19 1983-04-14 Control system for an internal combustion engine

Country Status (1)

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GB (1) GB2120410A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203357A2 (en) * 1985-05-25 1986-12-03 Robert Bosch Gmbh Apparatus for substituting a memory in a motor vehicle control system
WO1987006975A1 (en) * 1986-05-15 1987-11-19 Robert Bosch Gmbh Controller for internal combustion engines
WO1989000641A1 (en) * 1987-07-11 1989-01-26 Robert Bosch Gmbh Process and device for controlling technical installations and machines

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2037009A (en) * 1978-11-27 1980-07-02 Gen Motors Corp Engine control system
GB2072101A (en) * 1980-03-21 1981-09-30 Berkel Patent Nv Price-computing device including a printer
EP0067875A1 (en) * 1980-12-29 1982-12-29 Fanuc Ltd. System for executing a program

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2037009A (en) * 1978-11-27 1980-07-02 Gen Motors Corp Engine control system
GB2072101A (en) * 1980-03-21 1981-09-30 Berkel Patent Nv Price-computing device including a printer
EP0067875A1 (en) * 1980-12-29 1982-12-29 Fanuc Ltd. System for executing a program

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203357A2 (en) * 1985-05-25 1986-12-03 Robert Bosch Gmbh Apparatus for substituting a memory in a motor vehicle control system
EP0203357A3 (en) * 1985-05-25 1988-12-28 Robert Bosch Gmbh Method and apparatus for substituting a memory in a motor vehicle control system
WO1987006975A1 (en) * 1986-05-15 1987-11-19 Robert Bosch Gmbh Controller for internal combustion engines
WO1989000641A1 (en) * 1987-07-11 1989-01-26 Robert Bosch Gmbh Process and device for controlling technical installations and machines
US5138548A (en) * 1987-07-11 1992-08-11 Robert Bosch Gmbh Method of assuring integrity of information being stored

Also Published As

Publication number Publication date
GB8310100D0 (en) 1983-05-18

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)