Patents Examined by W. R. Wolfe
  • Closed loop lean air/fuel ratio controller
    Patent number: 4509484
    Abstract: The air/fuel ratio of the mixture supplied to an internal combustion engine is controlled to a lean limit resulting in a maximum engine operating roughness at one level during off-idle operation and a higher level during idle conditions. Roughness is detected by comparing the minimum engine speed attained during each cylinder combustion cycle to the average of the minimum speeds.
    Type: Grant
    Filed: May 16, 1983
    Date of Patent: April 9, 1985
    Assignee: General Motors Corporation
    Inventor: Kevin M. Gertiser
  • Fuel supply control method for an internal combustion engine, adapted to improve operational stability, etc., of the engine during operation in particular operating conditions
    Patent number: 4509489
    Abstract: A fuel supply control method for electronically controlling the air/fuel ratio supply to an engine, in response to the output from means for detecting concentration of an ingredient in exhaust gases from the engine. When the engine is in a feedback control region, the air/fuel ratio control is effected by the use of a first coefficient, the value of which is variable in response to the output from the exhaust gas ingredient concentration detecting means, while simultaneously a mean value of values of the first coefficient applied during the feedback control operation is calculated for use as a second coefficient. The second coefficient and a predetermined value are used for control of the air/fuel ratio, in place of the first coefficient, respectively, when the engine is in a first one of the particular operating regions and when the engine is in a second one of same.
    Type: Grant
    Filed: June 8, 1983
    Date of Patent: April 9, 1985
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shumpei Hasegawa, Yutaka Otobe, Noriyuki Kishi, Takashi Koumura
  • Diesel engine with EGR control
    Patent number: 4509492
    Abstract: A Diesel engine including a load responsive mechanism providing a load mechanical output dependent on the load on the engine; a source of vacuum pressure; a load pressure converter communicating with said source and coupled to said load responsive mechanism, the load pressure converter providing a load vacuum pressure level dependent on the load mechanical output; a speed responsive mechanism providing a speed mechanical output dependent on the revolution rate of the engine; a speed pressure converter communicating with the load pressure converter and coupled to the speed responsive mechanism, the speed pressure converter providing an output vacuum pressure level dependent on the load vacuum pressure level and the speed mechanical output; and an EGR control valve for regulating the flow of gases between the exhaust and the intake of the engine in response to the output vacuum pressure level.
    Type: Grant
    Filed: April 1, 1983
    Date of Patent: April 9, 1985
    Assignee: Diesel Kiki Co., Ltd.
    Inventors: Kouji Ochiai, Hitoshi Tomita
  • Electronically controlled fuel metering system for an internal combustion engine
    Patent number: 4508082
    Abstract: An electronically controlled fuel metering system for an internal combustion engine is proposed which includes devices for damping engine jerking. The following signals are formed: ti (k) as the up-to-date load value; tiM as the up-to-date averaged load value; ti (k-1)+.DELTA.ti/2 as a special load value for use in a transition into overrunning; and tiM+.DELTA.tiM/2 for the purpose of successive approximation of the average value to up-to-date load values in the case of slow acceleration processes and flat courses of load reduction. A computer-controlled realization is possible for forming and selecting the individual values. A block circuit diagram is also provided for an electronically controlled fuel metering system made up of discrete modular elements.
    Type: Grant
    Filed: March 6, 1984
    Date of Patent: April 2, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Wolfram Becker, Helmut Denz
  • Exhaust gas-purifying device of an internal combustion engine
    Patent number: 4506644
    Abstract: An engine comprising a variable venturi-type carburetor which has a raised wall formed on the inner wall of the intake passage thereof. The suction piston of the carburetor has a tip face having a V-shaped cross-sectional upstream end portion which cooperates with the raised wall for defining an approximately isosceles triangle-shaped airflow-restricting opening therebetween when the amount of air flowing within the intake passage is small. An electromagnetic valve is arranged in an air-bleed passage of the carburetor and is periodically opened at a fixed frequency of 1 to 2 Hz so that the air-fuel ratio fluctuates at a fixed frequency within the range of .+-.0.2 A/F unit through a .+-.1.0 A/F unit relative to an approximately stoichiometric air-fuel ratio.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: March 26, 1985
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takashi Katou, Takaaki Itou
  • Ignition system for internal combustion engines
    Patent number: 4506643
    Abstract: The timing of the signal to the primary of an ignition coil is controlled by selectively connecting impedance to a transducer in accordance with an engine operating parameter such as revolutions per minute.
    Type: Grant
    Filed: April 9, 1982
    Date of Patent: March 26, 1985
    Assignee: Bayerische Motoren Werke A.G.
    Inventors: Alfred Krappel, Johannes Guggenmos, Josef Holzmann
  • Valve timing mechanisms of internal combustion engines
    Patent number: 4505235
    Abstract: An internal combustion engine having at least one cylinder with inlet and exhaust valves operated via rocker arms by respective cams carried by a single camshaft. The camshaft is connected to its drive by an eccentric linkage, the eccentricity of which is varied by a device responsive to engine speed, and is least at high speed. As engine speed falls, increasing eccentricity results in a relative advance of inlet valve closing time and relative retardation of exhaust and inlet valve opening times but little change in the timing of exhaust valve closure. The lift of the valves may be varied also if the rocker arm axes are movably mounted.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: March 19, 1985
    Assignee: National Research Development Corporation
    Inventor: Stephen W. Mitchell
  • Valve construction for multi-fuel engine
    Patent number: 4502433
    Abstract: A multi-fuel engine is capable of running on lead free gasoline, leaded gasoline, and liquid propane. The engine has a valve seat and an exhaust valve. The valve seat has a seating surface. The exhaust valve has an axis, a seating face, and is of dimensions sufficient for seating of the valve on the valve seat. The seating surface has a width in a range of about 2.30 to about 2.90 millimeters and defines an included angle in a range of about 110.degree. to about 130.degree. relative to the axis of the exhaust valve. Apparatus forcibly urges the seating face against the seating surface at a force in a range of about 200 to about 245 Newtons.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: March 5, 1985
    Assignee: Caterpillar Tractor Co.
    Inventors: Theodore Becker, Jr., Sam R. Congram, Carl L. McClung
  • Intake system for multiple cylinder internal combustion engine
    Patent number: 4502435
    Abstract: Intake system for a multiple cylinder internal combustion engine having primary and secondary passages leading to each cylinder and respectively provided with throttle valves. The primary passages for the respective cylinders are connected together through a first communicating passage of relatively large cross-sectional area and a second communicating passage of a relatively small cross-sectional area which is downstream of the first passage. One of the primary passages is provided with a shut-off valve which is located close to but downstream of the second communicating passage and adapted to be closed in idling operation or deceleration of the engine for directing the mixture totally toward the cylinder associated with the other primary passage. The primary and secondary passages leading to the same cylinder are connected together by a connecting passage downstream of the throttle valve.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: March 5, 1985
    Assignee: Mazda Motor Corporation
    Inventors: Tomoo Tadokoro, Toshimichi Akagi
  • Fuel injection control apparatus for internal combustion engine
    Patent number: 4501249
    Abstract: A fuel injection control apparatus for controlling the amount and the timing of fuel injection with the aid of a microcomputer includes a hot-wire type flow sensor for detecting an instantaneous intake air flow velocity within an intake air passage of an internal combustion engine. The output signal of the hot-wire type flow sensor is sampled at every predetermined crank angle or at every predetermined time point to be stored in a RAM. The time at which the instantaneous velocity of the intake air flow within the intake passage becomes maximum is detected. The fuel injection timing of a fuel injection valve disposed in the intake passage is so controlled that the fuel injection is terminated around the time point at which the instantaneous intake air flow velocity is maximum.
    Type: Grant
    Filed: April 25, 1983
    Date of Patent: February 26, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Matsuo Amano, Shinichi Sakamoto, Takeshi Hirayama, Takao Sasayama
  • Air-fuel ratio control apparatus
    Patent number: 4501243
    Abstract: In an air-fuel ratio control apparatus for engines, when a vehicle is brought to a stop and the engine comes into an idling operation, the average value of air-fuel ratio correction amount is decreased by a given amount and the air-fuel ratio control is started again from the decreased value by means of an average value hold circuit.
    Type: Grant
    Filed: April 29, 1983
    Date of Patent: February 26, 1985
    Assignees: Nippondenso Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Yukihide Niimi, Kenzi Kinoshita, Masahiro Urushidani
  • Method and apparatus for controlling an internal combustion engine
    Patent number: 4501250
    Abstract: For controlling an internal combustion engine at least first and second control maps are provided in which first and second control variables are stored respectively, which are addressible in response to different combinations of output parameters of the engine. First and second weighting factors are derived for weighting first and second control variables which are derived respectively in response to a first and a second combination of engine output operating parameters. The weighted first and second control variables are summed to derive a combined control variable for controlling one of the input operating parameters.
    Type: Grant
    Filed: March 14, 1983
    Date of Patent: February 26, 1985
    Assignee: Nippondenso Co., Ltd.
    Inventors: Norio Omori, Tsutomu Tabe, Katsunori Ito, Shuukichi Hayashi
  • Intake device of an internal combustion engine
    Patent number: 4499868
    Abstract: An engine comprising an intake port which has a separating wall projecting downwardly from the upper wall of the intake port. The separating wall defines a helical portion, an inlet passage portion tangentially connected to the helical portion, and a bypass passage interconnecting the inlet passage portion to the helical portion. A rotary valve is arranged in the bypass passage and actuated by a vacuum operated diaphragm apparatus. The rotary valve is opened when the amount of air fed into the cylinder of an engine is increased beyond a predetermined value.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: February 19, 1985
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mutsumi Kanda, Kiyoshi Nakanishi, Tokuta Inoue, Mikio Nakajima
  • Fuel-injection internal-combustion engine
    Patent number: 4498435
    Abstract: In an injection-type internal-combustion engine with an air suction passage 2 designed as a twist forming passage means, the edge 10 between a curved passage section 4 and the valve chamber 6 is formed by an elastically deformable hollow body 12 located in a cavity 11. The interior of the hollow body 12 is in communication with a pressure means source 15, 16, by means of which the pressure in the hollow space is varied in dependence upon operating parameters. When pressurized the hollow body extends out of the cavity and effects a constriction of the air stream passing through passage 2 whereby the twist is increased.
    Type: Grant
    Filed: October 15, 1982
    Date of Patent: February 12, 1985
    Assignee: Audi Nsu Auto Auto Union Aktiengesellschaft
    Inventor: Gunter Kromer
  • Air/fuel ratio feedback control system adapted to obtain stable engine operation under particular engine operating conditions
    Patent number: 4498445
    Abstract: An air/fuel ratio feedback control system adapted to control the air/fuel ratio of an air/fuel mixture being supplied to an internal combustion engine, by the use of a coefficient having a value variable in response to actual exhaust gas concentration. The system is operable to calculate the mean value of values of the aforesaid coefficient for each of a plurality of subregions of the feedback control region when the engine is operating in such subregion. When the engine is operating in one of a plurality of particular operating regions other than the feedback control region, control of the air/fuel ratio is effected by the use of one of such mean values, selected from among the mean values so calculated for each of such particular operating regions, in place of the aforementioned coefficient.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: February 12, 1985
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shumpei Hasegawa, Noriyuki Kishi, Takashi Koumura
  • Fuel supply system for an internal combustion engine
    Patent number: 4497300
    Abstract: A fuel supply system for an internal combustion engine is disclosed which includes a single fuel injection valve provided at the area at which a plurality of branch passages of an intake manifold join, and a pressure regulator which regulates the pressure of the fuel supplied to the fuel injection valve in accordance with a vacuum pressure in an intake manifold.According to this system, during low load condition, the pressure of the fuel supplied to the fuel injection valve is held within a range of levels lower than that appearing during high load conditions, thereby increasing the duration during which the fuel injection valve is opened in synchronism with the operation of each cylinder. Thereby, this system makes it possible to uniformly supply fuel to each cylinder for all running conditions of the vehicle.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: February 5, 1985
    Assignee: Nissan Motor Company, Limited
    Inventors: Kimiomi Maruyama, Yasuo Nakajima
  • Electronic fuel injection control system for internal combustion engines, including means for detecting engine operating condition parameters
    Patent number: 4497301
    Abstract: An electronic fuel injection control system for use with an internal combustion engine, which includes means for generating at least one kind of coefficient for correcting the value of basic fuel injection quantity data on the basis of output values of means for detecting engine operating condition parameters inclusive at least of engine temperature, and also includes means for setting the value of the above correction coefficient to a value corresponding to a predetermined value of an engine operating condition parameter concerned which falls within a range within which the value of the same parameter is variable during normal engine operation, when an output value of the detecting means becomes outside a range within which the same output value is variable during normal operation of the engine.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: February 5, 1985
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kazuo Inoue, Tetsuo Yamagata
  • Fuel control system
    Patent number: 4495930
    Abstract: An internal combustion engine operable on two kinds of fuel properly selected according to engine operating conditions. A control system is provided which controls the total amount of fuel supplied to the engine in response to intake air flow and controls the ratio between the amounts of the two kinds of fuel supplied to the engine in response to engine load.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: January 29, 1985
    Assignee: Nissan Motor Company, Limited
    Inventor: Yasuo Nakajima
  • Electronic control system for an internal combustion engine controlling air/fuel ratio depending on atmospheric air pressure
    Patent number: 4495921
    Abstract: An air fuel ratio control system includes a correction system for correcting air/fuel ratio depending on measured atmospheric air pressure. The correction system has sensors for detecting engine operating conditions. A reference intake manifold pressure corresponding to the detected engine operating condition at sea level is obtained from the engine operating condition. The reference atmospheric air pressure is compared with the measure intake manifold absolute pressure to determine a difference value. Based on the difference, a correction value for controlling the air/fuel ratio is determined.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: January 29, 1985
    Assignee: Nissan Motor Company, Limited
    Inventor: Kunifumi Sawamoto
  • Device for intake air temperature-dependent correction of air/fuel ratio for internal combustion engines
    Patent number: 4495925
    Abstract: A device for correcting the air/fuel ratio of a mixture being supplied to an internal combustion engine, by the use of a correction coefficient which has its value determined as a function of intake air temperature in the intake pipe of the engine, by a predetermined equation. Further, the air/fuel ratio may be corrected by the use of a second correction coefficient which has its value increasing as the intake air temperature decreases from a predetermined value. The above two correction coefficients have their values determined by means of arithmetic calculation, or by means of selective reading from a plurality of predetermined values stored in their respective memories, both based upon a detected value of the intake air temperature.
    Type: Grant
    Filed: November 17, 1982
    Date of Patent: January 29, 1985
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Shumpei Hasegawa