Abstract: A urea water supply system includes: a first supply valve for supplying urea water; a second supply valve for supplying urea water; a supply passage for connecting a urea water tank and the first and the second supply valves; and an electronic control unit (ECU). The supply passage branches to have a first supply passage extending from a branch point to the first supply valve and a second supply passage extending from the branch point to the second supply valve, and a volume of the first supply passage is greater than a volume of the second supply passage. The ECU opens the first supply valve while keeping the second supply valve closed, for starting filling of the supply passage with urea water, and thereafter determines completion of filling of urea water into the first supply passage.

Abstract: A urea water supply system includes: a first supply valve for supplying urea water; a second supply valve for supplying urea water; a supply passage for connecting a urea water tank and the first and the second supply valves; and an electronic control unit (ECU). The supply passage branches to have a first supply passage extending from a branch point to the first supply valve and a second supply passage extending from the branch point to the second supply valve, and a volume of the first supply passage is greater than a volume of the second supply passage. The ECU opens the first supply valve while keeping the second supply valve closed, for starting filling of the supply passage with urea water, and thereafter determines completion of filling of urea water into the first supply passage.

Abstract: An abnormality determination device is used in an exhaust gas purification system. The exhaust gas purification system is disposed in an exhaust gas passage of an internal-combustion engine and includes an injection valve for injecting a liquid reducing agent to a NOx purification catalyst for purifying NOx in an exhaust gas, and a pump for pressurizing and supplying the reducing agent to the injection valve via a reducing agent passage. The abnormality determination device includes an acquisition section acquiring a rotation speed of the pump when the injection valve is injecting the reducing agent as an injection time rotation speed; and a determiner determining whether the injection valve has an abnormality based on the injection time rotation speed.

Abstract: An injection controller that is applied to an exhaust purification system including an injector that is located in an exhaust passage of an internal combustion engine and injects to supply a reducing agent in a liquid state to a NOx purification catalyst purifying NOx in an exhaust gas, and a pump that pressurizes and pumps the reducing agent to the injector through a reducing-agent passage. The injection controller includes an acquisition unit configured to acquire a variation quantity of a rotational speed of the pump caused in response to an injection of the injector or a correlation value that is a value correlative to the variation quantity, as a rotational variation parameter, and a determination unit configured to determine whether an air mixing exists in the reducing-agent passage based on the rotational variation parameter.

Abstract: An injection controller that is applied to an exhaust purification system including an injector that is located in an exhaust passage of an internal combustion engine and injects to supply a reducing agent in a liquid state to a NOx purification catalyst purifying NOx in an exhaust gas, and a pump that pressurizes and pumps the reducing agent to the injector through a reducing-agent passage. The injection controller includes an acquisition unit configured to acquire a variation quantity of a rotational speed of the pump caused in response to an injection of the injector or a correlation value that is a value correlative to the variation quantity, as a rotational variation parameter, and a determination unit configured to determine whether an air mixing exists in the reducing-agent passage based on the rotational variation parameter.

Abstract: An abnormality determination device is used in an exhaust gas purification system. The exhaust gas purification system is disposed in an exhaust gas passage of an internal-combustion engine and includes an injection valve for injecting a liquid reducing agent to a NOx purification catalyst for purifying NOx in an exhaust gas, and a pump for pressurizing and supplying the reducing agent to the injection valve via a reducing agent passage. The abnormality determination device includes an acquisition section acquiring a rotation speed of the pump when the injection valve is injecting the reducing agent as an injection time rotation speed; and a determiner determining whether the injection valve has an abnormality based on the injection time rotation speed.

Abstract: A low pressure EGR regulating valve is driven by an electric actuator, and an output of the electric actuator is transmitted to an intake air throttle valve through a link device. An ECU executes a failure determination to determine presence of a failure in a case where a sensed opening degree, which is sensed with a low pressure EGR opening degree sensor, is other than an opening degree that corresponds to a maximum opening degree of the throttle valve limited by a mechanical stopper. The ECU executes the failure determination after the energization of the electric actuator is stopped in response to stopping of the engine.

Abstract: A low pressure EGR system includes a low pressure EGR passage connecting a downstream portion of an exhaust gas cleaner disposed in an exhaust passage to an upstream portion of a supercharger compressor disposed in an intake passage. A device for trapping foreign particles contained in EGR gas to be recirculated is disposed in the low pressure EGR passage. The trapping device may be positioned lower than the passage connected thereto so that foreign particles drop into the device by their own weight. A cross-sectional area of the trapping device may be made larger than that of the passage so that the flow speed of the EGR gas is reduced in the trapping device and the foreign particles are easily trapped. A valve for closing the low pressure EGR passage may be disposed therein to stop EGR when malfunctions are detected in the exhaust gas cleaner or the supercharger.

Abstract: A low pressure EGR regulating valve is driven by an electric actuator, and an output of the electric actuator is transmitted to an intake air throttle valve through a link device. An ECU executes a failure determination to determine presence of a failure in a case where a sensed opening degree, which is sensed with a low pressure EGR opening degree sensor, is other than an opening degree that corresponds to a maximum opening degree of the throttle valve limited by a mechanical stopper. The ECU executes the failure determination after the energization of the electric actuator is stopped in response to stopping of the engine.

Abstract: An exhaust recirculation apparatus is provided to an engine. A high-pressure EGR passage branches from upstream of a turbine of a turbocharger in an exhaust system for recirculating exhaust gas to downstream of a compressor of the turbocharger in an intake system. A high-pressure EGR regulating unit controls exhaust gas through the high-pressure EGR passage. A low-pressure EGR passage branches from downstream of the turbine in the exhaust system for recirculating exhaust gas to upstream of the compressor in the intake system. A low-pressure EGR regulating unit controls exhaust gas through the low-pressure EGR passage. A control unit feedback-controls the high-pressure EGR regulating unit, and open-controls the low-pressure EGR regulating unit when exhaust gas is recirculated through the high-pressure EGR passage and the low-pressure EGR passage. The control unit feedback-controls the low-pressure EGR regulating unit when exhaust gas is recirculated through only the low-pressure EGR passage.

Abstract: The fuel injection control apparatus includes a function of making a determination of whether learning conditions are satisfied to allow a fuel injection amount learning to be performed, a function of directing a commanded fuel injection amount in the fuel injection amount learning to a fuel injection valve if result of the determination is affirmative, a function of setting an upper limit value of an injection pressure in the fuel injection amount learning, a function of setting a target injection pressure in the fuel injection amount learning, a function of setting the injection pressure to the target injection pressure, a function of detecting an actual fuel injection amount, and a function of correcting an amount of fuel injected by the fuel injection valve on the basis of a difference between the commanded fuel injection amount and the actual fuel injection amount at the target injection pressure.

Abstract: A fuel injection control device is disclosed that includes a fuel injection valve for performing a fuel injection event at an assumed fuel quantity. The device also includes a rotation detecting device for detecting a change in rotation amount of the output shaft. The device further includes a slip rate detection device for detecting a slip rate between the output shaft and the driven shaft. Also included is an actual fuel injection amount estimating device for estimating an actual fuel injection quantity during the fuel injection event based on the detected change in rotation and the detected slip rate. The device also includes a learning device for learning a deviation based on the difference between the estimated actual fuel injection quantity and the assumed fuel injection quantity. A related method is also disclosed.

Abstract: In a system, an actuator is linked to a valve rotatably installed in a passage through which gas flows. The actuator changes torque to be applied to the valve so as to adjust a rotational position of the valve based on a deviation between a current position and a target position. In the system, a first storing unit stores therein a first threshold. The first threshold is defined in a variation range within which a torque parameter is variable depending on change in the torque to be applied to the valve. The first threshold allows whether there is a possibility that an operation of the actuator is unstable. If the torque parameter substantially shifts either to or through the first threshold in the variation range, a restricting unit restricts variation in the torque parameter with the gas-flow being substantially kept through the passage.

Abstract: A fuel injection control apparatus for an internal combustion engine is provided. A controller directs a fuel injector to spray a learning injection quantity of fuel and determines a resulting increase in speed of the engine. The controller determines the quantity of the fuel actually sprayed from the fuel injector based on the increase in speed of the engine and calculates a correction factor which compensates for a difference between the learning injection quantity and the actual injection quantity. The controller also determines a variation in load acting on a driving member of a torque transmission mechanism. When such a variation is great undesirably, the controller stops spraying the learning injection quantity. The controller may determine the increase in speed of the engine based on the degree of the variation in load. This ensures the accuracy in calculating the correction factor regardless of the variation in load.

Abstract: A fuel injection control apparatus for an internal combustion engine is provided. A controller directs a fuel injector to spray a learning injection quantity of fuel and determines a resulting increase in speed of the engine. The controller determines the quantity of the fuel actually sprayed from the fuel injector based on the increase in speed of the engine and calculates a correction factor which compensates for a difference between the learning injection quantity and the actual injection quantity. The controller also determines a variation in load acting on a driving member of a torque transmission mechanism. When such a variation is great undesirably, the controller stops spraying the learning injection quantity. The controller may determine the increase in speed of the engine based on the degree of the variation in load. This ensures the accuracy in calculating the correction factor regardless of the variation in load.

Abstract: The fuel injection control apparatus includes a function of making a determination of whether learning conditions are satisfied to allow a fuel injection amount learning to be performed, a function of directing a commanded fuel injection amount in the fuel injection amount learning to a fuel injection valve if result of the determination is affirmative, a function of setting an upper limit value of an injection pressure in the fuel injection amount learning, a function of setting a target injection pressure in the fuel injection amount learning, a function of setting the injection pressure to the target injection pressure, a function of detecting an actual fuel injection amount, and a function of correcting an amount of fuel injected by the fuel injection valve on the basis of a difference between the commanded fuel injection amount and the actual fuel injection amount at the target injection pressure.

Abstract: A low pressure EGR system includes a low pressure EGR passage connecting a downstream portion of an exhaust gas cleaner disposed in an exhaust passage to an upstream portion of a supercharger compressor disposed in an intake passage. A device for trapping foreign particles contained in EGR gas to be recirculated is disposed in the low pressure EGR passage. The trapping device may be positioned lower than the passage connected thereto so that foreign particles drop into the device by their own weight. A cross-sectional area of the trapping device may be made larger than that of the passage so that the flow speed of the EGR gas is reduced in the trapping device and the foreign particles are easily trapped. A valve for closing the low pressure EGR passage may be disposed therein to stop EGR when malfunctions are detected in the exhaust gas cleaner or the supercharger.

Abstract: A fuel injection controller calculates a difference between a rotation speed fluctuation amount of an engine in the case where an injection for learning is performed and the rotation speed fluctuation amount in the case where the injection for the learning is not performed as a rotation speed increase amount. The controller calculates an actual injection amount actually injected from an injector based on a rotation state of the engine. The controller calculates a difference between the actual injection amount and a command injection amount outputted to the injector as a characteristic deviation and corrects the command injection amount to reduce the characteristic deviation. The controller prohibits the correction of the command injection amount when a variation in the rotation speed increase amount is equal to or greater than a specified value.

Abstract: A fuel injection controller calculates a difference between a rotation speed fluctuation amount of an engine in the case where an injection for learning is performed and the rotation speed fluctuation amount in the case where the injection for the learning is not performed as a rotation speed increase amount. The controller calculates an actual injection amount actually injected from an injector based on a rotation state of the engine. The controller calculates a difference between the actual injection amount and a command injection amount outputted to the injector as a characteristic deviation and corrects the command injection amount to reduce the characteristic deviation. The controller prohibits the correction of the command injection amount when a variation in the rotation speed increase amount is equal to or greater than a specified value.

Abstract: An exhaust recirculation apparatus is provided to an engine. A high-pressure EGR passage branches from upstream of a turbine of a turbocharger in an exhaust system for recirculating exhaust gas to downstream of a compressor of the turbocharger in an intake system. A high-pressure EGR regulating unit controls exhaust gas through the high-pressure EGR passage. A low-pressure EGR passage branches from downstream of the turbine in the exhaust system for recirculating exhaust gas to upstream of the compressor in the intake system. A low-pressure EGR regulating unit controls exhaust gas through the low-pressure EGR passage. A control unit feedback-controls the high-pressure EGR regulating unit, and open-controls the low-pressure EGR regulating unit when exhaust gas is recirculated through the high-pressure EGR passage and the low-pressure EGR passage. The control unit feedback-controls the low-pressure EGR regulating unit when exhaust gas is recirculated through only the low-pressure EGR passage.