Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Takeshi Aoki

Atsuhiro Miyauchi

Michinori Tani

Seiji Watanabe

Tooru Sekiguchi

Hiroyuki Ando

Joel K Lewis

Marcos J DeLeon

Jared S Shattuck

Keisuke Nakamura

Hiroshi Yatani

Kazuhiko Imamura

Tomoharu Hozumi

Atsushi Mitsui

Tanabe Yuichiro

Masaaki Nagashima

Akihiko Ohhashi

Akira Nakashima

Hiroyuki Yamashita

Soichiro Goto

Takashi Yanagiura

Kazunori Kawamura

Shuuichiro Iwatsuki

Yuichiro Tanabe

An air-fuel ratio control apparatus for an internal combustion engine includes an air-fuel ratio detector, a fuel amount controller, an operational state parameter acquiring device, an extractor, a failure determination device, a variation state parameter calculator, and a determination stopping device. The operational state parameter acquiring device is configured to acquire at least one operational state parameter. The failure determination device is configured to execute failure determination of determining a failure in an air-fuel ratio control system of the internal combustion engine based on a specific frequency component extracted by the extractor. The variation state parameter calculator is configured to calculate a variation state parameter. The determination stopping device is configured to stop the failure determination if the variation state parameter calculated by the variation state parameter calculator is equal to or larger than a predetermined threshold value.

Air-fuel ratio control apparatus for internal combustion engine

An air-fuel ratio control system for an internal combustion engine has a perturbation control which oscillates the air-fuel ratio with a first frequency. A first difference signal is generated indicative of a difference between a present value and a first past value from an air-fuel ratio sensor detected at a timing of a first specific period which is set to reduce a specific frequency component corresponding to a specific frequency different from the first frequency. A first frequency component is extracted. A second difference signal is generated indicative of a difference between a present value and a second past value detected at a timing of a second specific period which is set to reduce the first frequency component. The specific frequency component is extracted. A failure of the control system is determined by a relationship between intensities of the first frequency component and the specific frequency component.

Air-fuel ratio control system for internal combustion engine

An apparatus for controlling an air-fuel ratio of an internal-combustion engine includes an air-fuel ratio detector, a fluctuation signal generating device, an air-fuel ratio fluctuation device, a 0.5th-order frequency component strength calculator, a fluctuation frequency component strength calculator, a reference component strength calculator, and an imbalance fault determining device. The reference component strength calculator is configured to calculate strength of a reference component in accordance with strength of a first frequency component and strength of a second frequency component. The imbalance fault determining device is configured to make a determination of an imbalance fault in which air-fuel ratios of a plurality of cylinders vary beyond a tolerance limit on a basis of a relative relationship between strength of the 0.5th-order frequency component and the strength of the reference component.

Apparatus for controlling air-fuel ratio of internal-combustion engine

An abnormality determining apparatus includes an air-fuel ratio controller, an output change period parameter calculator, an output change amount extremum calculator, and an abnormality determining device. The abnormality determining device is configured to determine an abnormality of an air-fuel ratio sensor based on a relationship between an output change period parameter and an output change amount extremum.

Abnormality determining apparatus for air-fuel ratio sensor

A stop control system for an internal combustion engine, which is capable of accurately stopping a piston at a predetermined position during stoppage of the engine while preventing occurrence of untoward noise and vibration. After stopping the engine, the stop control systemfor the engineaccording to the present invention executes a first stage control (step) in which a throttle valveis controlled to a first stage control target opening degree ICMDOFPRE smaller than a second predetermined opening degree ICMDOF, in order to stop the piston at the predetermined position, before executing a second stage control (step) in which the throttle valveis controlled to the second predetermined opening degree ICMDOF. Further, the stop control systemstabilizes initial conditions at the start of the second stage control by setting a first stage control start rotational speed NEICOFPRE and a first stage control target opening degree ICMDOFPRE according to a change in a corrected target stop control start rotational speed NEICOFREFN (stepsand).

Stop control system and method for internal combustion engine

An abnormality determination device for an air-fuel ratio sensor includes a differential value calculator and an abnormality determiner. The differential value calculator is configured to calculate a differential value of an output value of the air-fuel ratio sensor which is configured to detect an air-fuel ratio of exhaust gas. The abnormality determiner is configured to determine abnormality of the air-fuel ratio sensor based on a result of comparison between a reference output value of the air-fuel ratio sensor and a predetermined threshold. The reference output value is obtained by the air-fuel ratio sensor when the differential value calculated by the differential value calculator becomes a predetermined value.

Abnormality determination device for air-fuel ratio sensor

An oscillation signal is generated to oscillate the air-fuel ratio with a set frequency which is different from a 0.5th-order frequency (half of the frequency corresponding to a rotational speed of the engine). Air-fuel ratio perturbation control is performed to oscillate the air-fuel ratio according to the oscillation signal. An intensity of the 0.5th-order frequency component and the set frequency component contained in the detected air-fuel ratio signal are calculated. A determination parameter applied to determining an imbalance degree of air-fuel ratios corresponding to the plurality of cylinders is calculated according to the two intensities and determines an imbalance failure that the imbalance degree of the air-fuel ratios exceeds an acceptable limit. A predicted imbalance value, indicative of a predicted value of the imbalance degree, is calculated, and an amplitude of the oscillation signal is set according to the predicted imbalance value.

To provide a stop control system for an internal combustion engine, which is capable of accurately stopping a piston at a predetermined position while compensating for variation in the stop characteristic of the piston and aging thereof. The stop control systemfor the engineaccording the present invention controls a throttle valvetoward an open side when an engine speed NE becomes lower than a stop control start rotational speed NEIGOFTH after the engineis stopped (step), whereby a final compression stroke rotational speed NEPRSFTGT is controlled to a predetermined reference value NENPFLMTO, to thereby control the stop position of the pistonto a predetermined position. Further, the correlation between the stop control start rotational speed NEIGOFTH and the final compression stroke rotational speed NEPRSFTGT is determined (step, FIG.), and based on the determined correlation, a target stop control start rotational speed NEICOFREFX is calculate and learned (step), for use in the stop control.

An intake manifold is disclosed. The intake manifold includes a first chamber in fluid communication with a PCV line and disposed generally upstream of a second chamber. The chambers are designed to provide a long flow path for the moisture laden PCV gas and to help reduce the introduction of moisture or fluids into the second chamber. This helps to prevent the ingestion of moisture or fluids by the combustion chambers of engine. An optional fluid blocker can also be used to trap fluids and help prevent those fluids from entering a cylinder port.

Intake manifold

Automobile, toy replica and/or other replicas

Automobile and/or replica thereof

Fluid blocker for an intake manifold

A vehicle rear body structure includes a support frame of generally rectangular shape attached to side frames of a vehicle body from below for supporting thereon a vehicle part including a fuel tank. The support frame is connected at a front end thereof to floor frames disposed inwardly of the side frames and extending along front parts of the side frames and, at a rear end thereof, to rear frames forming rear parts of the side frames.

Vehicle rear body structure

A structure for a vehicle body having an outrigger integrally coupled with a rear end of a side sill, a side end of a rear cross member and a front end of a rear side frame by means of die-cast molding. The structure may also have a support member supporting a rear trailing arm and a side jack up point, wherein the support member and the side jack up point are integrally coupled with the outrigger by means of die-cast molding.

Growing community of inventors

Wako, Japan

Takeshi Aoki