Abstract: Provided is a connector having excellent abrasion resistance. The invention applies to a connector including a terminal portion electrically connecting two objects to be connected and a connector housing portion in which the terminal portion is accommodated. The connector housing portion has a first housing in which a fixing portion to which a fixed portion formed in the terminal portion is to be fixed is formed and a second housing that engages with a main body-side housing fixed to one of the objects to be connected in a state in which the first housing is accommodated in the second housing.

Abstract: Provided is a connector having excellent vibration resistance. The invention applies to a connector including a terminal portion and a connector housing in which the terminal portion is accommodated and electrically connecting a first object to be connected and a second object to be connected via the terminal portion. A main body-side male contact is connected to the first object to be connected. A main body-side female contact is connected to the second object to be connected. The terminal portion has a connector-side male contact that is inserted into the main body-side female contact, a connector-side female contact into which the main body-side male contact is inserted, and an elastically deformable joint portion that joins the connector-side male contact and the connector-side female contact to each other.

Abstract: Provided is a connector having excellent vibration resistance. The invention applies to a connector including a terminal portion and a connector housing in which the terminal portion is accommodated and electrically connecting a first object to be connected and a second object to be connected via the terminal portion. A main body-side male contact is connected to the first object to be connected. A main body-side female contact is connected to the second object to be connected. The terminal portion has a connector-side male contact that is inserted into the main body-side female contact, a connector-side female contact into which the main body-side male contact is inserted, and an elastically deformable joint portion that joins the connector-side male contact and the connector-side female contact to each other.

Abstract: Provided is a connector having excellent abrasion resistance. The invention applies to a connector including a terminal portion electrically connecting two objects to be connected and a connector housing portion in which the terminal portion is accommodated. The connector housing portion has a first housing in which a fixing portion to which a fixed portion formed in the terminal portion is to be fixed is formed and a second housing that engages with a main body-side housing fixed to one of the objects to be connected in a state in which the first housing is accommodated in the second housing.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: A deterioration detection apparatus for an oxygen sensor is able to detect an abnormality of the oxygen sensor constantly with high precision, without being affected by the temperature characteristic of the element impedance. The apparatus applies a voltage V to the oxygen sensor, and calculates an element impedance real value Rsr=V/1 of a sensor element based on the applied voltage and the current I caused to flow by the voltage. The apparatus calculates an element temperature estimated value Tex of the oxygen sensor from a factor that affects the temperature of the oxygen sensor. The apparatus determines whether the oxygen sensor has an abnormality on the basis of whether the relationship between the element impedance real value Rsr and the element temperature estimated value Tex can be regarded as a relationship that agrees with a normal temperature characteristic.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: A deterioration detection apparatus for an oxygen sensor is able to detect an abnormality of the oxygen sensor constantly with high precision, without being affected by the temperature characteristic of the element impedance. The apparatus applies a voltage V to the oxygen sensor, and calculates an element impedance real value Rsr=V/1 of a sensor element based on the applied voltage and the current I caused to flow by the voltage. The apparatus calculates an element temperature estimated value Tex of the oxygen sensor from a factor that affects the temperature of the oxygen sensor. The apparatus determines whether the oxygen sensor has an abnormality on the basis of whether the relationship between the element impedance real value Rsr and the element temperature estimated value Tex can be regarded as a relationship that agrees with a normal temperature characteristic.

Abstract: A deterioration detection apparatus for an oxygen sensor is able to detect an abnormality of the oxygen sensor constantly with high precision, without being affected by the temperature characteristic of the element impedance. The apparatus applies a voltage V to the oxygen sensor, and calculates an element impedance real value Rsr=V/1 of a sensor element based on the applied voltage and the current I caused to flow by the voltage. The apparatus calculates an element temperature estimated value Tex of the oxygen sensor from a factor that affects the temperature of the oxygen sensor. The apparatus determines whether the oxygen sensor has an abnormality on the basis of whether the relationship between the element impedance real value Rsr and the element temperature estimated value Tex can be regarded as a relationship that agrees with a normal temperature characteristic.

Abstract: A fuel injection system for diesel engines, capable of carrying out a control operation for varying a mixing ratio of a fuel to water (inert material) arbitrarily in accordance with the magnitude of an engine load in a short period of time, and holding down the formation of nitrogen oxides to a level equal to that in a related art fuel injection system using an aqueous emulsion fuel, by uniformly mixing the fuel in the same manner as an aqueous emulsion fuel used in a related art fuel injection system, with water (inert material) in the combustion chamber. A fuel is injected from a fuel injection nozzle toward the water (inert material) held in water holding portions, or a fuel is injected from a fuel injection nozzle into the water (inert material) supplied from water supply passages.

Abstract: An element impedance detection apparatus for an oxygen sensor is provided with a first switching device, a second resistor, first resistor, and a first condenser for application of a sweep voltage to the oxygen sensor. The first switching device is switched to ON and the sweep voltage applied; a sensor current I that flows in the oxygen sensor along with application of the sweep voltage is then detected. Element impedance is calculated based on the sweep voltage and the sensor current. The second resistor, the first resistor and the first condenser are connected to the oxygen sensor such that a time constant of the sweep voltage increases as the element impedance becomes larger.

Abstract: In an abnormality detection system that detects abnormality in an oxygen sensor including a detection element for outputting a current value corresponding to an oxygen concentration upon receipt of a voltage application, a negative value is applied to the oxygen sensor so as to obtain an impedance of the detection element. Then a difference between the obtained impedance of the oxygen sensor upon application of the negative voltage and the impedance of the oxygen sensor upon application of a positive voltage prior to the negative voltage application is calculated. It is determined whether there is abnormality in the oxygen sensor based on the calculated difference.

Abstract: A novel abnormality detection device for an air-fuel ratio sensor able to more accurately detect an abnormality, provided with an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and an air-fuel ratio sensor activating means for activating the air-fuel ratio sensor, wherein the activity of the air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of the air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.

Abstract: An engine ECU executes a program including the steps of determining whether a combustion pressure in a specific cylinder is at least a predetermined value or not, determining whether there is an input from a crank angle sensor or not, detecting a lacking tooth, determining whether the lacking tooth is in a correct position or not, determining that the crank angle sensor is operating normally if the lacking tooth is in a correct position, and determining that the crank angle sensor is operating abnormally if the lacking tooth is not in the correct position.

Abstract: A highly flexible current detection circuit for an A/F sensor, that can readily provide for a change to an A/F sensor having a difference characteristic. The A/F sensor current detection circuit of the invention comprises: an operational amplifier for generating a voltage to be applied to the A/F sensor; a current-measuring first resistor connected between the operational amplifier and the A/F sensor; voltage-dividing second and third resistors connected in series with each other with one end thereof connected between the operational amplifier and the first resistor; a first output terminal provided between the operational amplifier and the first resistor; a second output terminal provided between the first resistor and the A/F sensor; and a third output terminal provided between the voltage-dividing second and third resistors. When measuring the sensor element admittance with this circuit, the third output terminal is used in place of the first output terminal.

Abstract: An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

Abstract: A novel abnormality detection device for an air-fuel ratio sensor able to more accurately detect an abnormality, provided with an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and an air-fuel ratio sensor activating means for activating the air-fuel ratio sensor, wherein the activity of the air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of the air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.