Abstract: When a fuel cut command is issued, a time required for a crankshaft of each cylinder to rotate through a certain angle is stored in one memory per cylinder. In a stage of engine production, a combustion variation per cylinder is stored in another memory. When fuel is supplied, a particular component is extracted from a value obtained by subtracting the sum of the time required for the rotation in a non-combustion state and the combustion variation from the time required for the rotation corresponding to a cylinder determined to be in a combustion stroke. The occurrence of a misfire is determined when the extracted particular component exceeds a threshold.

Abstract: When a fuel cut command is issued, a time required for a crankshaft of each cylinder to rotate through a certain angle is stored in one memory per cylinder. In a stage of engine production, a combustion variation per cylinder is stored in another memory. When fuel is supplied, a particular component is extracted from a value obtained by subtracting the sum of the time required for the rotation in a non-combustion state and the combustion variation from the time required for the rotation corresponding to a cylinder determined to be in a combustion stroke. The occurrence of a misfire is determined when the extracted particular component exceeds a threshold.

Abstract: An intake-air measuring apparatus for an internal combustion engine, enabling to calculate a mass of intake-air inducted into the internal combustion engine, with a small map but at high accuracy, comprises: a means for measuring out an air mass passing through a throttle valve based on pressure in up/down streams of the throttle valve and temperature in the upstream of the throttle valve; a means for calculating an air mass passing through the intake valve based on a rotation speed of the internal combustion engine, an open/close timing of the intake valve and an opening of an EGR valve; and a means for selecting either one of the air mass passing through the throttle valve or the air mass passing through the intake valve, depending upon operation condition of the internal combustion engine, thereby outputting the selected air mass as inducted air mass into the internal combustion engine.

Abstract: An intake-air measuring apparatus for an internal combustion engine, enabling to calculate a mass of intake-air inducted into the internal combustion engine, with a small map but at high accuracy, comprises: a means for measuring out an air mass passing through a throttle valve based on pressure in up/down streams of the throttle valve and temperature in the upstream of the throttle valve; a means for calculating an air mass passing through the intake valve based on a rotation speed of the internal combustion engine, an open/close timing of the intake valve and an opening of an EGR valve; and a means for selecting either one of the air mass passing through the throttle valve or the air mass passing through the intake valve, depending upon operation condition of the internal combustion engine, thereby outputting the selected air mass as inducted air mass into the internal combustion engine.

Abstract: A misfire detector is provided that is accurate even in the case of a disturbance due to causes such as driving on a rough road. The misfire detector is equipped with a crankshaft revolution detector to measure the time period required for the crankshaft of an internal-combustion engine to revolve for a given angle. A signal-processor is also provided for detecting the misfiring of the internal-combustion engine by processing the time period. In one embodiment, the misfire detector has two filters having the same sensitivity to the misfire frequency, and differing in the sensitivity to frequencies adjacent to said misfire frequency. It can be determined that a misfire has occurred if the ratio or difference between the outputs of the two filters stays within a fixed range and one or both of the filters have respective outputs exceeding a threshold value.

Abstract: A misfire detector is provided that is accurate even in the case of a disturbance due to causes such as driving on a rough road. The misfire detector is equipped with a crankshaft revolution detector to measure the time period required for the crankshaft of an internal-combustion engine to revolve for a given angle. A signal-processor is also provided for detecting the misfiring of the internal-combustion engine by processing the time period. In one embodiment, the misfire detector has two filters having the same sensitivity to the misfire frequency, and differing in the sensitivity to frequencies adjacent to said misfire frequency. It can be determined that a misfire has occurred if the ratio or difference between the outputs of the two filters stays within a fixed range and one or both of the filters have respective outputs exceeding a threshold value.

Abstract: An apparatus for measuring an intake air flow of an internal combustion engine, wherein presence of a backflow is determined from a waveform of the electric signal of flow detecting unit. If a backflow is present, a kurtosis is calculated. A backflow ratio is calculated based on the relation obtained from the kurtosis and the backflow ratio. The mass of the flow obtained by converting electric signals from the flow detecting unit into flows are integrated or averaged. Then, the integrated value or the average value is compensated by the backflow ratio, and accumulate mass of the air flow is calculated.

Abstract: An apparatus for measuring an intake air flow of an internal combustion engine, wherein presence of a backflow is determined from a waveform of the electric signal of flow detecting unit. If a backflow is present, a kurtosis is calculated. A backflow ratio is calculated based on the relation obtained from the kurtosis and the backflow ratio. The mass of the flow obtained by converting electric signals from the flow detecting unit into flows are integrated or averaged. Then, the integrated value or the average value is compensated by the backflow ratio, and accumulate mass of the air flow is calculated.

Abstract: There is provided an air flow meter for detecting the flow rate of air, an electronically controlled throttle for opening and closing a throttle valve and a calculating device to which a target engine intake air flow rate, a value detected by the air flow meter, the position of a throttle valve detected by a throttle position sensor, and a value detected by an engine speed sensor are input. The calculating device calculates a time constant of a delay of response of the air flow rate into the engine, and a air flow rate passing through the throttle valve to compensate for the delay of response, and drives the throttle valve such that the flow rate of air passing through the throttle valve agrees with the calculated value.

Abstract: An intake air flow rate measurement apparatus for measuring a flow rate of intake air taken in an internal combustion engine, using an electrothermal resistor type air flowmeter, includes a delay/non-linearity correction part to perform correction of an output signal of the electrothermal resistor type air flowmeter for a response delay and a non-linearity of the electrothermal resistor type air flowmeter; a waveform feature value extraction part to extract feature values of a waveform of an output signal which has been sent from said electrothermal resistor type air flowmeter and has been corrected for said response delay and non-linearity by the delay/non-linearity correction part; a back flow calculation part to obtain a back flow ratio based on the extracted waveform feature values; and a flow rate calculation part to obtain a correct flow rate of the intake air based on an output of the delay/non-linearity correction part and an output of the back flow ratio calculation part.

Abstract: There is provided an air flow meter for detecting the flow rate of air, an electronically controlled throttle for opening and closing a throttle valve and a calculating device to which a target engine intake air flow rate, a value detected by the air flow meter, the position of a throttle valve detected by a throttle position sensor, and a value detected by an engine speed sensor are input. The calculating device calculates a time constant of a delay of response of the air flow rate into the engine, and a air flow rate passing through the throttle valve to compensate for the delay of response, and drives the throttle valve such that the flow rate of air passing through the throttle valve agrees with the calculated value.

Abstract: A device for controlling the flow of intake air to an engine includes an air flow meter for detecting the flow rate of air, an electronically controlled throttle for opening and closing a throttle valve, and an electric motor that drives the throttle valve via a gear. The air flow meter and electric motor are arranged on opposite respective sides of a plane that include an axis of the throttle valve and that extends in a direction of the flow of intake air in the engine.

Abstract: An intake air flow rate measurement apparatus for measuring a flow rate of intake air taken in an internal combustion engine, using an electrothermal resistor type air flowmeter, includes a delay/non-linearity correction part to perform correction of an output signal of the electrothermal resistor type air flowmeter for a response delay and a non-linearity of the electrothermal resistor type air flowmeter; a waveform feature value extraction part to extract feature values of a waveform of an output signal which has been sent from said electrothermal resistor type air flowmeter and has been corrected for said response delay and non-linearity by the delay/non-linearity correction part; a back flow calculation part to obtain a back flow ratio based on the extracted waveform feature values; and a flow rate calculation part to obtain a correct flow rate of the intake air based on an output of the delay/non-linearity correction part and an output of the back flow ratio calculation part.

Abstract: An intake air flow rate measurement apparatus for measuring a flow rate of intake air taken in an internal combustion engine, using an electrothermal resistor type air flowmeter, includes a delay/non-linearity correction part to perform correction of an output signal of the electrothermal resistor type air flowmeter for a response delay and a non-linearity of the electrothermal resistor type air flowmeter; a waveform feature value extraction part to extract feature values of a waveform of an output signal which has been sent from said electrothermal resistor type air flowmeter and has been corrected for said response delay and non-linearity by the delay/non-linearity correction part; a back flow calculation part to obtain a back flow ratio based on the extracted waveform feature values; and a flow rate calculation part to obtain a correct flow rate of the intake air based on an output of the delay/non-linearity correction part and an output of the back flow ratio calculation part.

Abstract: There is provided an air flow meter for detecting the flow rate of air, an electronically controlled throttle for opening and closing a throttle valve and a calculating device to which a target engine intake air flow rate, a value detected by the air flow meter, the position of a throttle valve detected by a throttle position sensor, and a value detected by an engine speed sensor are input. The calculating device calculates a time constant of a delay of response of the air flow rate into the engine, and a air flow rate passing through the throttle valve to compensate for the delay of response, and drives the throttle valve such that the flow rate of air passing through the throttle valve agrees with the calculated value.

Abstract: There is provided an air flow meter for detecting the flow rate of air, an electronically controlled throttle for opening and closing a throttle valve and a calculating device to which a target engine intake air flow rate, a value detected by the air flow meter, the position of a throttle valve detected by a throttle position sensor, and a value detected by an engine speed sensor are input. The calculating device calculates a time constant of a delay of response of the air flow rate into the engine, and a air flow rate passing through the throttle valve to compensate for the delay of response, and drives the throttle valve such that the flow rate of air passing through the throttle valve agrees with the calculated value.

Abstract: This invention relates to a remote control apparatus. Guidance-control equipment and a control apparatus are installed at a site of a work at which the operation object is positioned. An input apparatus including a program input apparatus for inputting a work program determining the operation of an operation appliance and a time schedule input apparatus for inputting a time schedule as an actuation timing of the operation of the operation appliance determined by the work program, is disposed at an operation position spaced apart from the site of the work. Further, a work program memory, a time schedule controller, work interpretation apparatus, a work environment map memory, and a display device are disposed at the operation position.