US3745817A - Engine test method and apparatus - Google Patents

Engine test method and apparatus Download PDF

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Publication number
US3745817A
US3745817A US00196954A US3745817DA US3745817A US 3745817 A US3745817 A US 3745817A US 00196954 A US00196954 A US 00196954A US 3745817D A US3745817D A US 3745817DA US 3745817 A US3745817 A US 3745817A
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United States
Prior art keywords
engine
matrix
values
lines
signal
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Expired - Lifetime
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US00196954A
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English (en)
Inventor
M Williams
D Hodgson
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ZF International UK Ltd
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Lucas Industries Ltd
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters

Definitions

  • This invention relates to engine control systems of the kind in which any two of three engine parameters, namely engine speed, manifold pressure (which can of course be a negative pressure) and throttle angle are used to provide two signals, the signals providing inputs to a diode or other suitable semi-conductor matrix, the matrix being designed to give an output determined by both input signals and this output being used to control an engine characteristic.
  • the invention is particularly concerned with control systems for engines used in road vehicles and in most cases the engine characteristics controlled by the system is the injection of fuel to the engine, although, where the engine has a spark ignition system, the ignition timing or a combination of the timing and fuel injection could be controlled.
  • the object of the invention is to provide a convenient method of testing an engine which facilitates the manufacture of a control system of the kind specified.
  • the invention further resides in a method of testing an engine comprising deriving a first digital signal representative of a first engine parameter and a second digital signal representative of a second engine parameter, each of said signals providing an input to a semiconductor matrix which produces a digital output signal determined by the values of the input signals, said output signal being used to control an engine characteristic, and selecting the connections within the matrix for each combination of input signals so that, for each combination of the first and second digital signals, said output signal exercises the required control of said engine characteristic.
  • said matrix is a diode matrix in which the diodes are detachable so that the positions of the diodes within the matrix can be altered so as to vary the connections within the matrix.
  • the invention further resides in apparatus for performing the method.
  • the accompanying drawing is a diagrammatic illustration of a device for use in the manufacture of a fuel injection control system according to one example of the invention.
  • a transducer 8 which produces an electrical signal representing the throttle angle of the engine with which the system is employed.
  • the electrical signal from the transducer 8 is in the form of a 3 bit binary word which is fed to control means 11 which serves to energise one of 8input lines 134 to 13h, the input lines 13a to 13h fonning part of a diode matrix unit 10, the construction of which will be described later.
  • the unit 10 further includes 8 sets of input lines 16a to 16h, each of the lines 13a to 13h crossing each of the sets of lines 16a to 16h. Although in the example shown there are 8 input lines 13 and 8 sets of lines 16, it will be appreciated that the number of lines can be more or less than this figure. Moreover, although in the example shown each set of lines 16 contains 5 lines, they can be more or less lines in each set 16.
  • a second transducer 9 which produces an electrical signal representing engine speed, the signal being in the form of a 3 bit binary word which is fed to control means 12, which energises one of a set of lines 14a to 14h.
  • the lines 14a to 14h are connected to a switching device 15 having 8 sets of switches 15a to 15k respectively. The arrangement is suchthat when a signal appears on the line 14a, the
  • switches 15a connect the lines 16a to 5 output lines 21 coupled to a decoder 22, the output from which is fed to injection means 23 controlling the quantity of fuel supplied to the engine.
  • the lines 16 and 13 are interconnected by diodes in a manner to be described.
  • the connections between the first two sets of lines 16a and 16b and the lines 13 are shown, each dot representing a diode connection.
  • the switches 15a connect the lines 16a to the decoder 22, and the decoder 22 will receive a signal of the form 10,000, where 1 represents the diode connection between the line 13a and the first of the set of lines 16a.
  • the decoder 22 will receive a signal 01,111.
  • the unit 10 'produces an output dependent on the two input signals controlled by the decoders, and controls the fuel in accordance with the connections within the unit 10.
  • the unit 10 includes a base plate in the form of a peg board 31 above which the lines 13 and 16 are supported by pegs (not shown).
  • the lines 13 extend in a first plane above the board 31, the lines 16 extend in a second plane above the board 31 and at right angles to the lines 13.
  • Each of the lines 13 crosses each of the lines 16 but is spaced from the lines 16.
  • the design of the unit 10 is such that any line 13 can be connected to any line 16' by one of a number of semi-conductor diodes each of which can be detachably engaged between a line 13 and a line 16 to electrically connect the lines.
  • a number of diodes are shown connected between the lines 13 and the first two groups of lines 16, the diode connections being indicated by the dots previously referred to.
  • the engine speed and the throttle angle of the engine are set at predetermined values such that the line 13a is energised andthe line 14a is energised, energisation of the line 14a serving to couple the lines 16a to the output lines 21.
  • the line 13a is connected to the lines 16a by l or more diodes which may be chosen arbitrarily, or with some prior knowledge of the engine characteristic, and as shown the output lines 21 will receive a signal 10,000.
  • the signal on the output lines 21 serves through the decoder'22 and the injection means 23 to govern the amount of fuel supplied to the engine for the predetermined throttle setting and engine speed, and the perfonnance of the engine under these circumstances is inspected.
  • the nature of the inspection dependson the intention of the designer, and by way of example the intention could be to maximise engine performance, or to minimise exhaust pollution.
  • the designer attempts to improve the situation by varying the diode connections.
  • the connections chosen may not provide the required results, and the next step may, merely by way of example, be to insert another diode at the connection of the line 13a to the line so that the lines 21 receive a signal 1 1,000. This process continues until the optimum engine condition is reached. The engine speed is then kept constant, but the throttle angle changed so that the line 13b is energised instead of the line 13a.
  • the diode connections between the line 13b and the lines 160 are then varied in the same way to give the best possible result. This procedure continues with all the sites in the matrix, the term site" being used to indicate the position at which a line 13 can be connected by up to 5 diodes to a set of lines 16.
  • diode matrix units can be manufactured on a production basis for use in engine control systems.
  • the lines 21 are disconnected from the switches 15, and are connected instead through 5 manually operable switches respectively to a power source. Closing of one of the 5 manually operable switches feeds a signal 1 to the decoder 22, and in this way the decoder 22 can be fed with a digital signal which simulates the insertion of diodes into the unit 10.
  • the diodes are inserted at the appropriate site on the unit in accordance with the positions of the switches, so that if the first three switches are closed and the last two are open, diodes are inserted to connect the line 13a to the first three of the lines 160, but not to the last two of the lines 16a. This action is repeated for each site, and considerably reduces the time necessary for establishing the diode positions. It is necessary after finding the diode positions with the switches to insert the diodes in the unit itself and then to repeat the tests, in case some of the diodes need to be moved.
  • the switches can again be used instead of the diodes, as long as the diode connections are all present, and the lines 21 are coupled to the switches 15 or to the manually operable switches at any given instant.
  • a method of testing an engine comprising deriving a first set of digital signals representative of a range of values of a first engine parameter and a second set of digital signals representative of a range of values of a second engine parameter, feeding one signal from the first set representing one value of the first engine parameter and one signal from the second set representing one value of the second engine parameter to a semiconductor matrix which produces a digital output signal determined by the values of the signals fed to the semi-conductor matrix, said output signal being used to control an engine characteristic, and selecting the connections within the matrix for said combination of one of the first set of digital signals and one of the second set of digital signals so that, said output signal exercises the required control of said engine characteristics, and then repeating said process for each possible combination of signals from the first set and the second set.
  • Apparatus for testing an engine comprising in combination a first transducer for deriving a first digital signal having one of a plurality of values representing a range of values of a first engine parameter, a second transducer for deriving a second digital signal having one of a plurality of values representative of a range of values of a second engine parameter, a diode matrix to which the signals from said transducers are applied, said diode matrix incorporating detachable diodes so that the positions of the diodes within the matrix can be altered so as to vary the connections within the matrix, and engine control means operable by the output from the diode matrix to control said engine characteristic.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Testing Of Engines (AREA)
US00196954A 1970-11-11 1971-11-09 Engine test method and apparatus Expired - Lifetime US3745817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5354670 1970-11-11

Publications (1)

Publication Number Publication Date
US3745817A true US3745817A (en) 1973-07-17

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ID=10468187

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US00196954A Expired - Lifetime US3745817A (en) 1970-11-11 1971-11-09 Engine test method and apparatus

Country Status (9)

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US (1) US3745817A (enrdf_load_stackoverflow)
JP (1) JPS5128771B1 (enrdf_load_stackoverflow)
AU (1) AU465537B2 (enrdf_load_stackoverflow)
CA (1) CA970466A (enrdf_load_stackoverflow)
DE (1) DE2155823B2 (enrdf_load_stackoverflow)
FR (1) FR2114559A5 (enrdf_load_stackoverflow)
GB (1) GB1353900A (enrdf_load_stackoverflow)
IT (1) IT944844B (enrdf_load_stackoverflow)
SE (1) SE373663B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921444A (en) * 1973-05-02 1975-11-25 Toyota Motor Co Ltd Frequency meter for vehicle running speed versus fuel consumption rate
US4145932A (en) * 1977-06-08 1979-03-27 Robert Bosch Gmbh Pressure transducer
FR2519086A1 (fr) * 1981-12-29 1983-07-01 Sibe Dispositif d'alimentation de moteur a combustion interne comprenant un carburateur
US5813374A (en) * 1987-11-12 1998-09-29 Injection Research Specialists, Inc. Two-cycle engine with electronic fuel injection
US6357420B1 (en) * 1998-09-28 2002-03-19 Caterpillar Inc. Method of tuning hyraulically actuated fuel injection systems based on electronic trim
US6748928B2 (en) 2002-04-26 2004-06-15 Caterpillar Inc In-chassis determination of fuel injector performance

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1431772A (en) * 1972-07-15 1976-04-14 Lucas Electrical Ltd Control systems for engines
US4487181A (en) * 1982-04-03 1984-12-11 Lucas Industries Public Limited Company Fuel supply system for an internal combustion engine
DE3341295A1 (de) * 1983-11-15 1985-05-23 Atlas Fahrzeugtechnik GmbH, 5980 Werdohl Einspritzpruefstandsteuergeraet
RU2151384C1 (ru) * 1998-08-17 2000-06-20 Ульяновское высшее авиационное училище гражданской авиации Способ диагностирования и прогнозирования технического состояния двигателей внутреннего сгорания в процессе их работы
RU2377526C1 (ru) * 2008-03-31 2009-12-27 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный университет путей сообщения" (СамГУПС) Способ диагностирования и прогнозирования технического состояния двигателей внутреннего сгорания в процессе их работы

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345505A (en) * 1960-10-24 1967-10-03 Gen Precision Systems Inc Function generator
FR1415235A (fr) * 1964-11-26 1965-10-22 Philips Nv Dispositif de commande électronique pour l'injection de carburant dans une machine à combustion interne
US3689753A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921444A (en) * 1973-05-02 1975-11-25 Toyota Motor Co Ltd Frequency meter for vehicle running speed versus fuel consumption rate
US4145932A (en) * 1977-06-08 1979-03-27 Robert Bosch Gmbh Pressure transducer
FR2519086A1 (fr) * 1981-12-29 1983-07-01 Sibe Dispositif d'alimentation de moteur a combustion interne comprenant un carburateur
US5813374A (en) * 1987-11-12 1998-09-29 Injection Research Specialists, Inc. Two-cycle engine with electronic fuel injection
US6357420B1 (en) * 1998-09-28 2002-03-19 Caterpillar Inc. Method of tuning hyraulically actuated fuel injection systems based on electronic trim
US6748928B2 (en) 2002-04-26 2004-06-15 Caterpillar Inc In-chassis determination of fuel injector performance

Also Published As

Publication number Publication date
AU3536171A (en) 1973-05-10
IT944844B (it) 1973-04-20
SE373663B (sv) 1975-02-10
GB1353900A (en) 1974-05-22
JPS5128771B1 (enrdf_load_stackoverflow) 1976-08-21
DE2155823B2 (de) 1977-04-21
AU465537B2 (en) 1975-10-02
FR2114559A5 (enrdf_load_stackoverflow) 1972-06-30
DE2155823A1 (de) 1972-05-18
CA970466A (en) 1975-07-01

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