EP0222019A1 - Regulateur de carburant pour moteur. - Google Patents

Regulateur de carburant pour moteur.

Info

Publication number
EP0222019A1
EP0222019A1 EP19860902028 EP86902028A EP0222019A1 EP 0222019 A1 EP0222019 A1 EP 0222019A1 EP 19860902028 EP19860902028 EP 19860902028 EP 86902028 A EP86902028 A EP 86902028A EP 0222019 A1 EP0222019 A1 EP 0222019A1
Authority
EP
European Patent Office
Prior art keywords
air
engine
fuel ratio
sensor
fuel
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
Application number
EP19860902028
Other languages
German (de)
English (en)
Other versions
EP0222019B1 (fr
Inventor
Seiji Wataya
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0222019A1 publication Critical patent/EP0222019A1/fr
Application granted granted Critical
Publication of EP0222019B1 publication Critical patent/EP0222019B1/fr
Expired legal-status Critical Current

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
    • F02D41/02—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
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488—Inhibiting the regulation
    • F02D41/149—Replacing of the control value by an other parameter
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor

Definitions

  • This invention relates to a fuel controller for an engine improved for the accuracy of an air fuel ratio at a high load time when fuel is injected from a gasoline engine employing an air flow sensor based on a heat radiation principle (e.g., a hot-wire type air flow sensor) .
  • a heat radiation principle e.g., a hot-wire type air flow sensor
  • a fuel controller for an engine of an automobile generally controls an optimum amount of fuel supplied to the engine on the basis of an intake air quantity from an air flow sensor and the rotating speed of the engine from a rotary detector.
  • the construction of a conventional fuel controller of an engine is shown in Fig. 6.
  • Fig. 6 1 designates an engine
  • 2 designates a suction manifold.
  • An electromagnetic fuel injection valve 3 is provided in the suction manifold 2 , and the fuel injection valve 3 is controlled by a controller 8.
  • the suction manifold 2 is coupled with a surge tank 4, which is connected to a suction conduit 5.
  • a throttle valve 6 is disposed in the suction conduit 5.
  • a hot-wire type air flow sensor 7 is provided in the conduit 5. The output of the sensor 7 is fed to the controller 8.
  • the rotating speed of the engine 1 is detected by a rotary detector 9, which applies the detected output to the controller 8.
  • the controller 8 controls the fuel injection valve 3 by the output of the detector 9 and the output of the sensor 7.
  • the controller 8 is constructed as shown in Fig. 7, the output of the sensor 7 is converted by a digital converter 81 into a digital signal, and fed to a microprocessor 83.
  • the output of the detector 9 is supplied through an interface circuit 82 to the microprocessor 83.
  • the microprocessor 83 calculates a predetermined fuel amount on the basis of the output from the sensor 7 and the information from the detector 9, amplifies it via an amplifier 86 and controls the valve 3.
  • a random access memory (RAM) 84 and a read only memory (ROM) 85 are connected to the microprocessor 83.
  • the RAM 84 is used for calculating, and the ROM 85 stores the calculating sequence and the control data.
  • the output waveform of the sensor 7 becomes as shown in Fig. 8(b) in the specific rotating speed range (generally 1000 to 3000 ppm) near the WOT due to the blow-off from the engine 1, and the portion indicated by the hatched lines is excessively added to the true air flow rate.
  • the hot-wire type air flow sensor 7 based on the heat radiation principle detects as intake amount and outputs in irrespective of the air flowing direction.
  • the detecting error due to the blow-off depends upon the rotating speed as shown in Fig. 9, and is generated. ordinarily in the vicinity that the suction conduit vacuum becomes near -50 mmHg and arrives at 50 % at the maximum in the WOT range.
  • the upper limit value must be set to the intake air flow rate characteristic of the engine to be used at the ambient temperature in the sea level, it should become the upper limit value of mass flow rate at the ambient temperature at the sea level.
  • the upper limit of the output of the air flow sensor is heretofore stored in advance in the memory in the controller in response to the intake air flow rate characteristic of the engine, and even if the output of the sensor abnormally increases, a large error is eliminated in the air flow rate.
  • this method since the.upper limit is decided in response to the engine near the ambient temperature at a sea level, this method has such a drawback that the error in the air fuel ratio increases in the high altitude traveling or in high and low temperature atmosphere.
  • the present invention has been made to eliminate said prior art disadvantages and an object thereof is to provide a fuel controller for a engine which can obviate air fuel ratio error due to atmospheric pressure (in high altitude) and intake air temperature and obtain stable burning state under all operating conditions of the engine.
  • a fuel controller for an engine comprises an air fuel ratio sensor capable of detecting the air fuel ratio of a rich range from exhaust gas component to control the valve opening time of a fuel injection valve with the signal of the sensor as a main parameter when the signal of the sensor exhibits lean as compared with a predetermined value and to control to feedback so that the air fuel ratio becomes the predetermined value on the basis of the signal of the sensor when the signal of the sensor exhibits rich as compared with the predetermined value. Since the present invention detects the air fuel ratio of rich side by an air fuel ratio sensor to suppress the air fuel ratio error due to the blow-off of the intake air when the engine is fully opened, stable burning state can be attained under all operating condi- tions of the engine.
  • Fig. 1 is a view illustrating the entire construction of an embodiment of a fuel controller for an engine according to the present invention.
  • Fig. 2 is a block diagram illustrating the internal construction of the controller in the fuel controller of the engine in Fig. 1
  • Fig. 3 is a characteristic diagram of an air fuel ratio sensor in the fuel controller of the engine of the invention.
  • Fig. 4 is a time chart for explaining the operation of the invention.
  • Fig. 5 is a flow chart illustrating the flow of the operation of the fuel controller of the engine.
  • Fig. 6 is a view illustrating the entire construction of the fuel controller of the conventional engine.
  • Fig. 7 is a block diagram showing the internal construction of the controller in the fuel controller of the engine of Fig. 6, Fig.
  • FIG. 8 is a characteristic diagram of an air flow sensor in the fuel controller of the engine of Fig. 6,
  • Fig. 9 is a view showing the detecting error of the air flow sensor in the fuel controller of the engine of Fig. 6,
  • Fig. 10 * is an output characteristic diagram with respect to the rotating speed of the engine of the air flow sensor,
  • Fig. 11 is a view showing an error with respect to an altitude due to the air flow sensor in the fuel controller of the conventional engine.
  • Fig. 1 is a view showing the construction of an embodiment.
  • the same reference numerals as in Fig. 6 designate the corresponding components,and description of the construction is omitted, and the portion different from Fig. 6 will be mainly described.
  • an air fuel ratio sensor 10 is newly provided in the construction of Fig. 6, in Fig. 1, and the sensor 10 can linearly detect the air fuel ratio from the exhaust gas components of an engine 1.
  • the other construction is the same as in Fig. 6.
  • the sensor 10 produces, as shown in Fig. 2, an output to an A/D converter 81 in a controller 8.
  • Fig. 2 shows a block diagram of the sensor 10 corresponding to the conventional controller shown in Fig. 7, and the construction of Fig. 2 is different from Fig. 7 at the point that the output of the sensor 10 is newly delivered to the A/D converter 81, and the other construction is the same as in Fig. 7.
  • a combination of a zirconia type oxygen battery (atmospheric air is supplied to one side, and exhaust gas affected by the influence of an oxygen pump is supplied to the other) exhibiting a switching characteristic at stoichiometric air fuel ratio and an oxygen pump -is heretofore known, and NOx in the components of the exhaust gas and oxygen in CO are reduced to supply oxygen to the opposite atmospheric pressure side of the oxygen battery by applying a voltage to the oxygen pump to detect the air fuel ratio of rich side.
  • the output voltage with respect to the air fuel ratio of the sensor 10 is as shown in Fig. 3.
  • step 100 the intake air quantity Qa and the rotating speed Ne of the engine are read out as essential parameters.
  • next step 101 the drive pulse T ⁇ a_ of the fuel injection valve 3 is calculated from the input information, and in next step 102, it is judged whether the output of the sensor 10 is larger than a predetermined air fuel ratio (e.g., 12) or not. If larger (lean side) the final drive pulse width ⁇ is determined as x- (.in step 104) .
  • a predetermined air fuel ratio e.g. 12
  • This operation is repeated, and the actual air fuel ratio is controlled to be fed back with the air fuel ratio as a center.
  • This operation is continued while the drive pulse width ⁇ _ of the valve 3 due to the feedback control is smaller than the drive pulse width ⁇ _ of the valve 3 calculated from the intake air quantity Qa and the rotating speed Ne, and when the x ⁇ becomes larger than ⁇ _, the flat is reset in step 111, and the valve 3 is controlled with the pulse width of x- .
  • the air fuel ratio of rich side has been controlled to be fed back by using an air fuel sensor 10 capable of linearly detecting the air fuel ratio.
  • the air fuel ratio sensor 10 which inverts the output in a switching manner as the pre ⁇ determined air fuel ratio (e.g., 12) as the characteristic may be used to provide similar advantages.
  • the present invention is mainly utilized for a fuel controller of an engine for an automobile, but not limited to the automobile.
  • the present invention may be applied to the fuel control of a ship and aircraft engine which employ fuel such as gasoline.

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

Lorsque l'injection de carburant d'un moteur est commandée par un capteur d'écoulement d'air appliquant un principe de radiations thermiques, on utilise un capteur de rapport air/carburant (10) pouvant détecter le rapport air/carburant présentant un mélange riche à partir des composants des gaz d'échappement; dans l'éventualité d'une augmentation anormale du signal de sortie du capteur d'écoulement d'air à cause de l'expulsion de l'air d'admission en pleine charge, on exécute une régulation à réaction de manière à empêcher que le rapport air/carburant ne s'enrichisse pas au delà de la valeur prédéterminée à l'aide du signal provenant du capteur de rapport air/carburant.
EP19860902028 1985-05-07 1986-03-27 Regulateur de carburant pour moteur Expired EP0222019B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9852885A JPS61255238A (ja) 1985-05-07 1985-05-07 エンジンの燃料制御装置
JP98528/85 1985-05-07

Publications (2)

Publication Number Publication Date
EP0222019A1 true EP0222019A1 (fr) 1987-05-20
EP0222019B1 EP0222019B1 (fr) 1989-05-17

Family

ID=14222172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860902028 Expired EP0222019B1 (fr) 1985-05-07 1986-03-27 Regulateur de carburant pour moteur

Country Status (4)

Country Link
EP (1) EP0222019B1 (fr)
JP (1) JPS61255238A (fr)
DE (1) DE3663380D1 (fr)
WO (1) WO1986006792A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5616264B2 (ja) * 2011-03-24 2014-10-29 株式会社ケーヒン エンジン制御装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2229928C3 (de) * 1972-06-20 1981-03-19 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Verminderung von schädlichen Anteilen der Abgasemission von Brennkraftmaschinen
DE2417187C2 (de) * 1974-04-09 1982-12-23 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Regelung des Betriebsverhaltens einer Brennkraftmaschine
GB1568960A (en) * 1975-10-22 1980-06-11 Lucas Industries Ltd Fuel control system for an internal combustion engine
DE2633617C2 (de) * 1976-07-27 1986-09-25 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Bestimmung von Einstellgrößen bei einer Brennkraftmaschine, insbesondere der Dauer von Kraftstoffeinspritzimpulsen, des Zündwinkels, der Abgasrückführrate
JPS6060019B2 (ja) * 1977-10-17 1985-12-27 株式会社日立製作所 エンジンの制御方法
DE2840793C3 (de) * 1978-09-20 1995-08-03 Bosch Gmbh Robert Verfahren und Einrichtung zum Bestimmen der von einer Brennkraftmaschine angesaugten Luftmenge
JPS55139938A (en) * 1979-04-19 1980-11-01 Japan Electronic Control Syst Co Ltd Suction air amount computing method of internal combustion engine
JPS57148041A (en) * 1981-03-09 1982-09-13 Suzuki Motor Co Ltd Controller of air-fuel ratio in carburetor
JPS58131329A (ja) * 1982-01-29 1983-08-05 Nippon Denso Co Ltd 燃料噴射制御方法
JPS58150046A (ja) * 1982-03-03 1983-09-06 Hitachi Ltd 燃料噴射制御装置
JPS603446A (ja) * 1983-06-21 1985-01-09 Mitsubishi Electric Corp 機関の空燃比制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8606792A1 *

Also Published As

Publication number Publication date
JPS61255238A (ja) 1986-11-12
DE3663380D1 (en) 1989-06-22
EP0222019B1 (fr) 1989-05-17
WO1986006792A1 (fr) 1986-11-20

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