Honda Giken Kogyo Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Honda Motor Co., Ltd.

Ngk Spark Plug Company, Limited

Honda Giken Kogyo K.k.

Toyohei Nakajima

Toshiyuki Mieno

Yasushi Okada

Nobuyuki Oono

Akira Nagao

Akira Tanaka

Yukihiko Suzaki

Shumpei Hasegawa

Yasuhiro Toyoda

Takashi Koumura

Haruo Horiuchi

Hideji Yamada

Akira Kato

Sachito Fujimoto

Nobuhiro Hayakawa

Tetsusyo Yamada

Toru Yano

Masakazu Kitamoto

Junichi Miyake

Fumio Hosoda

Hideo Moriwaki

Kazunori Yokota

Nobuyuki Ohno

Takehiko Hosokawa

Masayuki Habaguchi

Junichi Kimura

Tetsuya Miyake

Nobuyuki Tanaka

Takefumi Nakamura

Yoshirou Simoyama

Kiyohisa Tomono

Nobuyuki Cono

Keiichi Hayashi

Masao Jogen

A device for measuring a flow rate of a mixture of evaporative fuel and air supplied to an internal combustion engine comprises a plurality of flowmeters arranged in a purging passage connecting between a canister and an intake passage of the engine for purging the mixture of evaporative fuel and air therethrough into the intake passage. The flowmeters have different output characteristics relative to concentration of the evaporative fuel in the mixture. At least one of the concentration of the evaporative fuel in the mixture and the volumetric flow rate of the mixture are detected based on outputs from the flowmeters. In an air-fuel ratio control system incorporating the above device, the weight per unit time of evaporative fuel supplied to the intake system is calculated from the detected concentration of the evaporative fuel and the detected volumetric flow rate of the mixture. The air-fuel ratio of a total air-fuel mixture supplied to the engine is corrected by the use of the ratio of the calculated weight per unit time of evaporative fuel supplied by purging to the intake system to weight per unit time of fuel supplied by injection to the engine.

Device for measuring concentration/flow rate of a mixture drawn into an

A temperature control device for an oxygen concentration sensor having a solid electrolytic member having oxygen ion-conductivity, a gas diffusion-limiting zone defined by the solid electrolytic member and into which is introduced a gas the concentration of which is to be examined, and a couple of electrodes between which the solid electrolytic member is interposed. Pumping current is supplied to the solid electrolytic member and flows therein between the electrodes to cause an oxygen ion flow in the solid electrolytic member between the electrodes to vary the concentration of oxygen present within the gas diffusion-limiting zone. The pumping current is varied in response to the concentration of oxygen within the gas diffusion-limiting zone, whereby the concentration oxygen in the gas is detected from the pumping current value. The temperature control device comprises a series circuit of an electrically heating element for heating the solid electrolytic member and a switching element, a power supply for supplying a direct current voltage to the series circuit, a current detector for detecting heating current flowing in the heating element, and a driving circuit responsive to the detected heating current for selectively energizing and deenergizing the switching element. A resistance is connected in parallel with the switching element for always allowing the supply of a small amount of current to the heating element irrespective of whether the switching element is energized or deenergized.

Temperature control device for oxygen concentration sensor

An oxygen concentration-sensing device has an oxygen concentration-sensing element which senses the concentration of oxygen contained in a gas, and a heater which heats the sensing element. A control device is electrically connected to the heater for controlling the supply of electricity to the heater so as to bring the temperature of the heater to a desired temperature. A coupler connects between the sensing element and the control device. A compensating resistance is accommodated in the coupler, which has a resistance value corresponding to a resistance value of the heater assumed at the desired temperature. The control device controls the supply of electricity to the heater based upon electrical information obtained from the compensating resistance.

Oxygen concentration-sensing device

A variable displacement type compressor includes a casing having a working chamber and cylinder bores provided therein and opened to face to the working chamber. The cylinder bores are disposed around a driving shaft rotatably carried in the casing. A working piston is slidably received in each of the cylinder bores. A sleeve is axially slidably fitted over the driving shaft within the working chamber and carries a holder mounted for swinging movement about an axis perpendicular to an axis of the driving shaft and connected to the driving shaft. A swingable swash plate is carried on the holder and connected by rods to the working pistons. A control piston is connected to the sleeve and slidably received in the casing to vary the angle of inclination of the holder and the swingable swash plate and vary the stroke of the working pistons. A stroke detecting device detects the operation stroke of the working pistons and includes an interlocking member supported at a middle portion on the casing by a shaft having an axis perpendicular to the axis of the driving shaft and connected at opposite ends to the control piston and a position detector disposed on the casing. The control piston can be relatively rotatably connected to the sleeve to inhibit transmission of rotating movement of the sleeve. The position detector is disposed outside the casing.

Variable displacement type compressor

A method for feedback controlling an air/fuel ratio of mixture supplied to an internal combustion engine to a target air/fuel ratio, which uses an output signal of an oxygen concentration sensor. The sensor's output signal is proportional to the oxygen concentration in the exhaust gas of the engine. When the target air/fuel ratio is set at a stoichiometric air/fuel ratio, the air/fuel ratio of the mixture is varied by a small amount around the stoichiometric value if the air/fuel ratio of mixture supplied to the engine is detected to be in a predetermined air/fuel ratio range which includes the stoichiometric air/fuel ratio. The determination of the air/fuel ratio is calculated from the output signal of the oxygen concentration sensor.

Method for controlling an air/fuel ratio of an internal combustion engine

An oxygen concentration detecting device includes at least one oxygen concentration detecting element formed by an oxygen-pumping element and a cell element, composed of an oxygen ion-conductive wall, separating a pair of electrodes. The oxygen-pumping element and cell element define a gas diffusion chamber. A current detecting resistance forms a series circuit with the oxygen-pumping element. A voltage applying circuit applies to the series circuit an output voltage corresponding to the difference between a voltage between the electrodes of the cell element and a first reference voltage. An output detecting circuit outputs a voltage signal corresponding to a value of pumping current flowing through the resistance. An operational amplifier has a non-inverting input terminal supplied with a second reference voltage, an inverting input terminal connected to one end of the resistance, and an output terminal connected to the other end of the resistance. The output detecting circuit detects a first voltage at the one end of the resistance and a second voltage at the other end and outputs the voltage signal corresponding to the difference between the detected first and second voltages. The output detecting circuit corrects the voltage signal based upon the first and second voltages which are obtained in a state where no pumping current is supplied to the resistance. Electrodes of the oxygen-pumping element and the cell element are connected together within the gas diffusion chamber or within the basic body of the sensor body.

Oxygen concentration detecting device

A device for detecting and measuring the concentration of a gas in a mixture of gas such as oxygen in the exhaust gas of an internal combustion engine and circuits for using that measurement to control the air-fuel ratio supplied to the engine. The detecting device has two separate gas residence chamber with different diffusion resistance openings for each chamber and separate pairs of electrodes for each chamber whereby the measurement can be separately made in each chamber. The particular chamber selected for measurement may be done on the basis of whether the air-fuel ratio is lean or rich whereby a substantially linear reading results for all ratios or on the basis of the transition-state or steady-state operating condition of the engine to provide either more rapid or more accurate readings. Further, by using the cells from both chambers to compare their readings and standards, the actual readings can be corrected for abnormalties that may occur after a period of use or to indicate the detector has become defective.

Device for measuring a component of a gaseous mixture

A control system for ignition timing and boost pressure in an internal combustion engine equipped with a turbocharger. The system has a device for detecting knocking in the respective cylinders and the result of the detection by this a device is used as the basis for calculating the ignition timing for each cylinder. When the mean ignition timing calculated from the ignition timings for all cylinders exceeds a prescribed reference value, the boost pressure is reduced. Alternatively, the boost pressure is immediately reduced when the most retarded of the ignition timings exceeds the prescribed value in the direction of retardation, irrespective of whether or not the average value exceeds the prescribed value. As a result, reduction of engine output can be minimized while precluding damage to the engine.

Control system for ignition timing and boost pressure in internal

An oxygen concentration-sensing device includes an oxygen concentration-sensing element formed by an oxygen-pumping element and a cell element, each composed of an oxygen ion-conductive electrolytic member and a pair of electrodes having the member interposed therebetween. The two elements define a gas diffusion-limiting zone therebetween. A current-to-voltage converter circuit has an input terminal connected to the junction between mutually connected ones of the electrodes. A first amplifier generates an output having a level variable in response to the difference between a potential at a conversion output terminal of the current-to-voltage converter circuit and a potential at the other electrode of the cell element, and applies the output to the other electrode of the oxygen-pumping element. A second amplifier has an input thereof connected to the above junction and generates an output proportional to current flowing in the oxygen-pumping element. The current-to-voltage converter circuit imparts a higher gain to the first amplifier when pumping current flowing in the oxygen-pumping element is in a high frequency range.

A method for controlling an oxygen concentration sensor for controlling an internal combustion engine, having a sensor body including a wall of oxygen ion conductive solid electrolyte member, and a heater element for heating the wall of oxygen ion conductive solid electrolyte member. During a time period after the ignition switch of the internal combustion engine is turned on, current value of the heater current to the heater element is reduced to a value which is smaller than the current value of the heater current to be supplied after the lapse of the time period.

Method for controlling an oxygen concentration sensor for use in an

A method for controlling an oxygen concentration sensor in which the supply of a heater current to a heater element is started when the complete combustion of the engine is detected. The supply of a pump current to an oxygen pump element is started when an internal resistance of the heater element is determined to be in a predetermined range. The supply of the pump current is started when the temperature of the oxygen pump element and the sensor cell element becomes sufficiently high to prevent the pump current from flowing excessively, thereby preventing the generation of blackening phenomenon.

Method of controlling an oxygen concentration sensor

An apparatus for controlling ignition timing in an internal combustion engine determines the amount of adjustment of ignition timing for preventing knocking with reference to the engine operating state. The amount of adjustment of the ignition timing carried out upon the detection of knocking is varied depending on the engine speed. Specifically, it is made large in the low speed region where the interval between successive firings is relatively long, thus increasing the speed with which knocking can be prevented and enhancing the protection of the engine from damage in this operating region. Also, rapid acceleration and other transient engine operating states are detected and a transient state adjustment is calculated separately of the adjustment amount for knocking prevention. The transient state adjustment is added to the knocking prevention adjustment and the result is used for retarding the ignition timing, whereby knocking can be effectively prevented during rapid acceleration. Further, after knocking has been prevented, the ignition timing is advanced with consideration given to reference knocking occurrence frequencies set independently for different engine operating conditions. Thus, the knocking occurrence frequency can be maintained at a fixed level irrespective of the engine operating condition, whereby the engine output can be optimized.

Apparatus for controlling ignition timing in internal combustion

A variable air induction control system for an internal combustion engine. The engine intake passage is divided into a long and small diameter main passage and a short and large diameter auxiliary passage. The auxiliary passage is provided with a valve which is opened and closed to adjust the air flow rate. The system is arranged such that, in accordance with the cylinder pressure, the intake air passes through the main intake passage during low speed engine operation and through both the main and auxiliary passages during high speed engine operation, whereby the air induction efficiency (charging efficiency) is enhanced and the engine output increased. As knocking is more likely to occur when the air induction efficiency is high, the opening/closing of the valve is controlled depending on whether or not knocking occurs. Moreover, it may be arranged such that when knocking does occur, it is first coped with by retarding the ignition and if knocking cannot be eliminated in this way, the air intake is adjusted.

Variable air induction control system for internal combustion engine

An air/fuel ratio control system for an internal combustion engine includes an oxygen concentration sensor for producing an output signal to indicate the concentration of oxygen in the engine exhaust gases, and a circuit for producing a discrimination signal which expresses the inherent error, due to manufacturing deviations, in the output signal of the oxygen concentration sensor. Compensation of the output signal from the oxygen concentration sensor is performed in accordance with the discrimination signal, to produce a compensated output signal which controls means for adjusting the air/fuel ratio of the mixture supplied to the engine. Accurate control of the air/fuel ratio is thereby achieved, irrespective of differences in the operating characteristics of oxygen concentration sensors due to manufacturing deviations.

Air/fuel ratio control system for internal combustion engine

A method of and an apparatus for controlling ignition timing in an internal combustion engine. When the ignition timing has been retarded for preventing knocking and the engine operation thereafter moves into a region of operation where knocking control is unnecessary with the retardation of the ignition timing still in effect, the ignition timing is slightly advanced once per predetermined number of firings. Since the ignition timing is gradually restored, engine output hunting is prevented. The advancement of the ignition timing is determined whether or not a prescribed wait period has passed. The period varies depending on an engine speed.

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Wako, Japan

Toyohei Nakajima