EP0222019A1 - Fuel controller for engine. - Google Patents
Fuel controller for engine.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
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.When the fuel injection of an engine is controlled by an air flow sensor applying a principle of thermal radiation, an air / fuel ratio sensor (10) is used which can detect the air / fuel ratio having a mixture rich from exhaust gas components; in the event of an abnormal increase in the output signal from the air flow sensor due to the expulsion of the intake air at full load, reaction regulation is carried out so as to prevent the air / fuel ratio is not enriched beyond the predetermined value using the signal from the air / fuel ratio sensor.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP98528/85 | 1985-05-07 | ||
JP9852885A JPS61255238A (en) | 1985-05-07 | 1985-05-07 | Fuel controller for engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0222019A1 true EP0222019A1 (en) | 1987-05-20 |
EP0222019B1 EP0222019B1 (en) | 1989-05-17 |
Family
ID=14222172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860902028 Expired EP0222019B1 (en) | 1985-05-07 | 1986-03-27 | Fuel controller for engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0222019B1 (en) |
JP (1) | JPS61255238A (en) |
DE (1) | DE3663380D1 (en) |
WO (1) | WO1986006792A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5616264B2 (en) * | 2011-03-24 | 2014-10-29 | 株式会社ケーヒン | Engine control device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2229928C3 (en) * | 1972-06-20 | 1981-03-19 | Robert Bosch Gmbh, 7000 Stuttgart | Method and device for reducing harmful components of exhaust gas emissions from internal combustion engines |
DE2417187C2 (en) * | 1974-04-09 | 1982-12-23 | Robert Bosch Gmbh, 7000 Stuttgart | Method and device for regulating the operating behavior of an internal combustion engine |
GB1568960A (en) * | 1975-10-22 | 1980-06-11 | Lucas Industries Ltd | Fuel control system for an internal combustion engine |
DE2633617C2 (en) * | 1976-07-27 | 1986-09-25 | Robert Bosch Gmbh, 7000 Stuttgart | Method and device for determining setting variables in an internal combustion engine, in particular the duration of fuel injection pulses, the ignition angle, the exhaust gas recirculation rate |
JPS6060019B2 (en) * | 1977-10-17 | 1985-12-27 | 株式会社日立製作所 | How to control the engine |
DE2840793C3 (en) * | 1978-09-20 | 1995-08-03 | Bosch Gmbh Robert | Method and device for determining the amount of air sucked in by an internal combustion engine |
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 (en) * | 1982-01-29 | 1983-08-05 | Nippon Denso Co Ltd | Fuel injection controlling method |
JPS58150046A (en) * | 1982-03-03 | 1983-09-06 | Hitachi Ltd | Fuel injection controller |
JPS603446A (en) * | 1983-06-21 | 1985-01-09 | Mitsubishi Electric Corp | Air-fuel ratio controller of engine |
-
1985
- 1985-05-07 JP JP9852885A patent/JPS61255238A/en active Pending
-
1986
- 1986-03-27 DE DE8686902028T patent/DE3663380D1/en not_active Expired
- 1986-03-27 WO PCT/JP1986/000146 patent/WO1986006792A1/en active IP Right Grant
- 1986-03-27 EP EP19860902028 patent/EP0222019B1/en not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8606792A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1986006792A1 (en) | 1986-11-20 |
EP0222019B1 (en) | 1989-05-17 |
JPS61255238A (en) | 1986-11-12 |
DE3663380D1 (en) | 1989-06-22 |
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