WO1990000679A1 - Fuel metering apparatus - Google Patents

Fuel metering apparatus Download PDF

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Publication number
WO1990000679A1
WO1990000679A1 PCT/GB1989/000758 GB8900758W WO9000679A1 WO 1990000679 A1 WO1990000679 A1 WO 1990000679A1 GB 8900758 W GB8900758 W GB 8900758W WO 9000679 A1 WO9000679 A1 WO 9000679A1
Authority
WO
WIPO (PCT)
Prior art keywords
throttle
values
engine
fuel
memory
Prior art date
Application number
PCT/GB1989/000758
Other languages
French (fr)
Inventor
Michael John Horton
Original Assignee
Collins Motor Corporation Limited
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 Collins Motor Corporation Limited filed Critical Collins Motor Corporation Limited
Publication of WO1990000679A1 publication Critical patent/WO1990000679A1/en

Links

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
    • F02D41/24—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
    • F02D41/2419—Non-linear variation along at least one coordinate
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1479—Using a comparator with variable reference
    • 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
    • F02D41/2496—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories the memory being part of a closed loop

Definitions

  • This invention relates to electrically controlled fuel metering apparatus for an internal combustion engine having an air throttle under external control, for example, by the driver of a vehicle or an engine speed regulating device.
  • external control member comprising means for generating an output control signals determining fuel delivery rate in response to signals representative of engine speed and throttle position characterised by a sensor responsive to variations in composition of exhaust gases from the engine which variations are due to variations in the ratio of air: to: fuel supplied to the engine, and correction means responsive to output signals from the sensor for applying a correction to the control means in response to a sensed departure of the said output signal from a predetermined value.
  • the correction means modifies the value of the signal representative of throttle position as supplied to the fuel injection control Deans.
  • FIG. 1 a cross section through a conventional internal combustion engine having a crank shaft 1 rotatably mounted in a crank case 2 and having a crank pin 3 journalled in the big end 4 of a connecting rod 5 the little end of which is connected by a gudgeon pin 6 to a piston 7 to reciprocate the latter in a cylinder bore in a water cooled cylinder block 8.
  • the upper end of the cylinder bore is closed by a cylinder head 9 formed with inlet and outlet ports controlled by inlet and outlet poppet valves 10 and 11.
  • An inlet manifold 12 controlled by a conventional butterfly throttle 13 is connected to the inlet port while the exhaust port is connected to an exhaust manifold 14.
  • a spark plug 15 is located in the crown of the combustion chamber C formed by the cylinder head, cylinder bore and piston 7.
  • electrically operated fuel injector 18 discharges pulses of fuel into the inlet manifold in the vicinity of the inlet port.
  • T.A.P. sensor 17 An imposed load demand on the engine at any instant is measured in this embodiment by sensing the angular position of the spindle of the throttle 13 by means of a sensor 17 hereinafter referred to as the T.A.P. sensor.
  • this sensor could for example monitor the position of an accelerator pedal which could be connected to operate the throttle spindle by an electronic link (the so called "drive by wire” arrangement).
  • the throttle can reach its wide open position before the accelerator pedal has completed its full travel, the last part of the travel of the accelerator pedal being arranged to enrichen the effective mixture from an economy range to a full power range.
  • Engine speed is continuously assessed by a R.P.M. sensor 18 mounted on the crank case 12 and activated by one or more elements on the engine flywheel 19.
  • Electrical pulses to operate injection valve 16 are supplied by an injection control system 21 which includes a memory in which values for injection pulse are stored for all
  • the timing of the ignition pulses supplied to the spark plug 15 is determined by an ignition controller 22 which includes a memory in which are stored ignition timing values for all combinations of speed R.P.M. and throttle opening T.A.P.
  • a gas sensor 23 mounted in the exhaust duct 14 is a gas sensor 23.
  • an exhaust gas oxygen sensor which provides a output signal which increases substantially linearly with increasing air:fuel ratio (A.F.R.) over the range of A.F.R. values of from 10:1 to 27:1, apart from a flat region in the range of about 14.257. to 14.75%.
  • the sensor 23 is connected by a cable 24 to its electronic module 25 and the output signal representing A.F.R. is supplied by a cable 26 to one input of a comparator 27, the other input of which receives, via a wire 28, a signal representative of the desired value of A.F.R. for the then-obtaining values of T.A.P. and R.P.M. supplied by a store 29 which includes a memory containing predetermined desired values of A.F.R. for all combinations of values of T.A.P. and R.P.M.
  • a signal representative of this difference is transmitted by a line 31 to a T.A.P. correction module 32 having a memory in which values of correction to be applied to the throttle angle position signal T.A.P. are stored in relation to all combinations of values of T.A.P. and differences in A.F.R.
  • the resulting T.A.P. correction signal 33 is conveyed by a line 34 to a T.A.P. correction device 35 which modifies the actual signal from the T.A.P. sensor 17 to a corrected value which is then supplied by lines 36 to the injection control system 21, the ignition controller 22 and to the store 29 and T.A.P. correction module 32.
  • the calculation routine for correction of T.A.P. may be temporarily disabled during rapid changes of operating parameters by means of a stability tester 37 which will only forward values of R.P.M. and corrected T.A.P. when the relative stability of these two values is within predetermined limits.
  • a stability tester 51 may be inserted in line 26 to block rapidly-varying signals from being supplied to the comparator 27.
  • acceleration controller 41 provides an output signal to a line 42 to an enrichment device 43 which increases the injection pulses supplied to it by the controller 21 along a line 44, the injector 16 being connected to the output of the device 43 by a line 45.
  • the enrichment device 43 also receives signals from a engine temperature sensor 46 to provide longer pulses to the line 45 for cold-running.
  • appropriate adjustment to the ignition timing is effected by a cold engine timing device 47 which is inserted between the line 48 from the ignition timing device 22 and the supply 49 for the spark plug 15.
  • the apparatus may include a device 49 which, when the TAP signal has a value representing an idling condition with the throttle 13 in its most closed condition, applies a predetermined correction or value to the TAP signal supplied to the injection controller 21 and ignition timing device 22.

Abstract

An exhaust gas oxygen sensor (23) gives an output signal representative of the air-fuel ratio (A.F.R.) supplied to an engine. Thus signal is compared, by a comparator (27) with a desired value of A.F.R. for the instantaneous values of engine speed and throttle opening from a memory (29). If an error is detected, a correction to the value of throttle angle is determined from a memory (32) and applied to modify the 'on' time of fuel injectors (16) of the engine.

Description

FUEL METERING APPARATUS
This invention relates to electrically controlled fuel metering apparatus for an internal combustion engine having an air throttle under external control, for example, by the driver of a vehicle or an engine speed regulating device.
According to the invention there is provided electronically control fuel metering apparatus for an internal combustion engine having an air throttle under the control of an
external control member, comprising means for generating an output control signals determining fuel delivery rate in response to signals representative of engine speed and throttle position characterised by a sensor responsive to variations in composition of exhaust gases from the engine which variations are due to variations in the ratio of air: to: fuel supplied to the engine, and correction means responsive to output signals from the sensor for applying a correction to the control means in response to a sensed departure of the said output signal from a predetermined value.
Advantageously, the correction means modifies the value of the signal representative of throttle position as supplied to the fuel injection control Deans.
The invention will now be further described by way of example with reference to the accompanying drawing in which the single figure shows diagramatically an arrangement for controlling a fuel-injection spark-ignition internal combustion engine.
In the figure there is shown a cross section through a conventional internal combustion engine having a crank shaft 1 rotatably mounted in a crank case 2 and having a crank pin 3 journalled in the big end 4 of a connecting rod 5 the little end of which is connected by a gudgeon pin 6 to a piston 7 to reciprocate the latter in a cylinder bore in a water cooled cylinder block 8. The upper end of the cylinder bore is closed by a cylinder head 9 formed with inlet and outlet ports controlled by inlet and outlet poppet valves 10 and 11.
An inlet manifold 12 controlled by a conventional butterfly throttle 13 is connected to the inlet port while the exhaust port is connected to an exhaust manifold 14. A spark plug 15 is located in the crown of the combustion chamber C formed by the cylinder head, cylinder bore and piston 7. An
electrically operated fuel injector 18 discharges pulses of fuel into the inlet manifold in the vicinity of the inlet port.
An imposed load demand on the engine at any instant is measured in this embodiment by sensing the angular position of the spindle of the throttle 13 by means of a sensor 17 hereinafter referred to as the T.A.P. sensor. It will however by appreciated that this sensor could for example monitor the position of an accelerator pedal which could be connected to operate the throttle spindle by an electronic link (the so called "drive by wire" arrangement). In such an arrangement, it is possible that the throttle can reach its wide open position before the accelerator pedal has completed its full travel, the last part of the travel of the accelerator pedal being arranged to enrichen the effective mixture from an economy range to a full power range.
Engine speed is continuously assessed by a R.P.M. sensor 18 mounted on the crank case 12 and activated by one or more elements on the engine flywheel 19. Electrical pulses to operate injection valve 16 are supplied by an injection control system 21 which includes a memory in which values for injection pulse are stored for all
combinations of values of throttle position (T.A.P.) and engine speed (R.P.M.). Correspondingly, the timing of the ignition pulses supplied to the spark plug 15 is determined by an ignition controller 22 which includes a memory in which are stored ignition timing values for all combinations of speed R.P.M. and throttle opening T.A.P.
Mounted in the exhaust duct 14 is a gas sensor 23. in this case an exhaust gas oxygen sensor which provides a output signal which increases substantially linearly with increasing air:fuel ratio (A.F.R.) over the range of A.F.R. values of from 10:1 to 27:1, apart from a flat region in the range of about 14.257. to 14.75%.
The sensor 23 is connected by a cable 24 to its electronic module 25 and the output signal representing A.F.R. is supplied by a cable 26 to one input of a comparator 27, the other input of which receives, via a wire 28, a signal representative of the desired value of A.F.R. for the then-obtaining values of T.A.P. and R.P.M. supplied by a store 29 which includes a memory containing predetermined desired values of A.F.R. for all combinations of values of T.A.P. and R.P.M.
If the comparator 27 determines that the actual value of A.F.R. differs from the predetermined desired value, a signal representative of this difference is transmitted by a line 31 to a T.A.P. correction module 32 having a memory in which values of correction to be applied to the throttle angle position signal T.A.P. are stored in relation to all combinations of values of T.A.P. and differences in A.F.R.
The resulting T.A.P. correction signal 33 is conveyed by a line 34 to a T.A.P. correction device 35 which modifies the actual signal from the T.A.P. sensor 17 to a corrected value which is then supplied by lines 36 to the injection control system 21, the ignition controller 22 and to the store 29 and T.A.P. correction module 32. If desired, the calculation routine for correction of T.A.P. may be temporarily disabled during rapid changes of operating parameters by means of a stability tester 37 which will only forward values of R.P.M. and corrected T.A.P. when the relative stability of these two values is within predetermined limits. Alternatively, a stability tester 51 may be inserted in line 26 to block rapidly-varying signals from being supplied to the comparator 27.
In response to rapid opening movement of the throttle 13, as indicated by a rapid rate of change of the signal from the T.A.P. sensor 17 outside a predetermined limit, an
acceleration controller 41 provides an output signal to a line 42 to an enrichment device 43 which increases the injection pulses supplied to it by the controller 21 along a line 44, the injector 16 being connected to the output of the device 43 by a line 45. The enrichment device 43 also receives signals from a engine temperature sensor 46 to provide longer pulses to the line 45 for cold-running. Similarly, appropriate adjustment to the ignition timing is effected by a cold engine timing device 47 which is inserted between the line 48 from the ignition timing device 22 and the supply 49 for the spark plug 15.
If required, the apparatus may include a device 49 which, when the TAP signal has a value representing an idling condition with the throttle 13 in its most closed condition, applies a predetermined correction or value to the TAP signal supplied to the injection controller 21 and ignition timing device 22.

Claims

Claims
1. Electronically controlled fuel metering apparatus for an internal combustion engine having an air throttle under the control of an external control member, comprising means for generating output control signals determining fuel delivery rate in response to signals representative of engine speed and throttle position characterised by a sensor responsible to variations in composition of exhaust gases from the engine which variations are due to variations in the ratio of air-to-fuel supplied to the engine, and correction means responsive to output signals from the sensor for applying a correction to the control means in response to a sensed departure of the said sensor output signal from a
predetermined value.
2. Apparatus according to claim 1, wherein predetermined values of air-to-fuel ratio are stored in a memory for combinations of values of engine speed and throttle position.
3. .Apparatus according to claim 1 or 2, in which the correction means is arranged to modify the value of the signal representative of throttle position as supplied to the fuel injection control means.
4. Apparatus according to claim 3, wherein the correction means comprises a memory in which are stored values of the throttle angle correction for combination of values of throttle angle and sensed departure of the sensor output form the predetermined value.
5. Apparatus according to any of the preceding claims, wherein the said means for generating output control signals includes a memory in which are stored values of 'on' time for a fuel injector for combinations of values of throttle opening and engine speed.
6. Apparatus according to any of claims 3 to 5, having an ignition timing memory in which which values for ignition timing are stored for combinations of engine speed and throttle opening, and ignition means for the engine are timed by the values obtained from the ignition timing memory using the modified value of throttle opening.
7. .Apparatus according to any preceding claim wherein the air throttle is operated by the external control member in such a manner that, in the direction of movement of the control member to open the throttle, the throttle reaches its wide open position before the control member has completed its full travel, and the last part of the travel of the control member is arranged to increase the fuel delivery rate.
PCT/GB1989/000758 1988-07-05 1989-07-05 Fuel metering apparatus WO1990000679A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8815930.6 1988-07-05
GB888815930A GB8815930D0 (en) 1988-07-05 1988-07-05 Fuel metering apparatus

Publications (1)

Publication Number Publication Date
WO1990000679A1 true WO1990000679A1 (en) 1990-01-25

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Application Number Title Priority Date Filing Date
PCT/GB1989/000758 WO1990000679A1 (en) 1988-07-05 1989-07-05 Fuel metering apparatus

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AU (1) AU3966489A (en)
GB (1) GB8815930D0 (en)
WO (1) WO1990000679A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221065B (en) * 1988-07-21 1992-11-04 Fuji Heavy Ind Ltd A two-stroke cycle engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745768A (en) * 1971-04-02 1973-07-17 Bosch Gmbh Robert Apparatus to control the proportion of air and fuel in the air fuel mixture of internal combustion engines
DE3007664A1 (en) * 1980-02-29 1981-09-10 Daimler-Benz Ag, 7000 Stuttgart METHOD FOR OPERATING A INTERNAL COMBUSTION ENGINE OPERATED WITH HOMOGENOUS GAS
US4359029A (en) * 1979-05-31 1982-11-16 Nissan Motor Company, Limited Air/fuel ratio control system for an internal combustion engine
EP0157340A2 (en) * 1984-03-29 1985-10-09 Honda Giken Kogyo Kabushiki Kaisha Method for controlling the supply of fuel for an internal combustion engine
EP0282841A2 (en) * 1987-03-14 1988-09-21 Hitachi, Ltd. An air/fuel ratio control apparatus for an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745768A (en) * 1971-04-02 1973-07-17 Bosch Gmbh Robert Apparatus to control the proportion of air and fuel in the air fuel mixture of internal combustion engines
US4359029A (en) * 1979-05-31 1982-11-16 Nissan Motor Company, Limited Air/fuel ratio control system for an internal combustion engine
DE3007664A1 (en) * 1980-02-29 1981-09-10 Daimler-Benz Ag, 7000 Stuttgart METHOD FOR OPERATING A INTERNAL COMBUSTION ENGINE OPERATED WITH HOMOGENOUS GAS
EP0157340A2 (en) * 1984-03-29 1985-10-09 Honda Giken Kogyo Kabushiki Kaisha Method for controlling the supply of fuel for an internal combustion engine
EP0282841A2 (en) * 1987-03-14 1988-09-21 Hitachi, Ltd. An air/fuel ratio control apparatus for an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221065B (en) * 1988-07-21 1992-11-04 Fuji Heavy Ind Ltd A two-stroke cycle engine

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Publication number Publication date
GB8815930D0 (en) 1988-08-10
AU3966489A (en) 1990-02-05

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