Abstract: System, apparatus, and methods are disclosed for enabling a quality diagnostic of an aqueous urea solution (AUS) of an exhaust system when the AUS is outgassed. Systems, apparatus, and methods are also disclosed for disabling an output of a quality condition of the AUS in response at least in part to detecting that an AUS fill event of an AUS storage tank has occurred.

Abstract: A method and system for improving sensor accuracy of diesel emissions is disclosed. The method and system change the sensor reading as a function of sensor age to provide a more accurate measure of the diesel emissions. By estimating the degree of sensor error and then providing a gain correction factor as a function of sensor age, a more accurate measure of the diesel emissions is provided.

Abstract: A method and system for improving sensor accuracy of diesel emissions is disclosed. The method and system change the sensor reading as a function of sensor age to provide a more accurate measure of the diesel emissions. By estimating the degree of sensor error and then providing a gain correction factor as a function of sensor age, a more accurate measure of the diesel emissions is provided.

Abstract: A method and system for improving sensor accuracy of diesel emissions is disclosed. The method and system comprises changing the sensor reading as a function of sensor age to provide a more accurate measure of the diesel emissions. By estimating the degree of sensor error and then providing a gain correction factor as a function of sensor age, a more accurate measure of the diesel emissions is provided.

Abstract: Detection of cylinder misfires in engines. In one aspect of the invention, a method for detecting a cylinder misfire in an engine includes monitoring a temperature in the exhaust of the engine. Vibration of the engine is analyzed to identify a misfiring cylinder in the engine if the monitored temperature indicates a misfire may have occurred.

Abstract: Detection of cylinder misfires in engines. In one aspect of the invention, a method for detecting a cylinder misfire in an engine includes monitoring a temperature in the exhaust of the engine. Vibration of the engine is analyzed to identify a misfiring cylinder in the engine if the monitored temperature indicates a misfire may have occurred.

Abstract: The present invention provides an internal combustion engine system that includes an internal combustion engine system includes an internal combustion engine having an intake manifold fluidly coupled to a compressor adapted to receive ambient air through an air conduit of the engine, a first sensor positioned at least one of inside and outside the air conduit and configured to measure a first water content in the ambient air, and a second sensor positioned at least one of inside the intake manifold and upstream of the intake manifold and configured to measure a second water content in the intake manifold.

Abstract: The present invention provides an internal combustion engine system that includes an internal combustion engine system includes an internal combustion engine having an intake manifold fluidly coupled to a compressor adapted to receive ambient air through an air conduit of the engine, a first sensor positioned at least one of inside and outside the air conduit and configured to measure a first water content in the ambient air, and a second sensor positioned at least one of inside the intake manifold and upstream of the intake manifold and configured to measure a second water content in the intake manifold.

Abstract: A system for measuring NOx content of an exhaust gas produced includes at least one controllable valve operable to direct exhaust gas to a NOx sensor only when measurement of the NOx content is desired and to otherwise expose the NOx sensor to ambient air. A control circuit controls the operation of the at least one valve and determines the NOx content of the exhaust gas based on sensory data received from the NOx sensor.

Abstract: An exhaust gas aftertreatment filter system for an internal combustion engine includes an aftertreatment filter disposed in-line with an exhaust gas conduit coupled to an internal combustion engine, a mounting bracket defining a mounting surface and at least one leg extending from the mounting bracket, the at least one leg defining a mounting foot at a distal end thereof with the mounting foot of the at least one leg and the mounting surface of the mounting bracket defining a first air gap therebetween, the mounting foot of the at least one leg secured to the aftertreatment filter, and at least one electrical component secured to the mounting surface of the mounting bracket.

Abstract: A system for determining a reagent solution quality indicator includes a reagent solution source for supplying the reagent solution to an emissions catalyst configured to receive a NOx-containing gas therethrough, means for determining a flow rate of NOx reduced from the gas by the catalyst, means for determining a flow rate of the reagent solution into the catalyst, and a control circuit determining the reagent solution quality indicator as a function of the NOx flow rate and the reagent solution flow rate. The system may additionally be configured to diagnose reagent solution quality by configuring the control circuit to monitor the reagent solution quality indicator over time and produce a fault value if the reagent solution quality indicator crosses a reagent quality indicator threshold, and to diagnose the catalyst by producing another fault value if the catalyst capacity point falls outside of a catalyst capacity point threshold.

Abstract: An engine having an electronic engine control unit (ECU) is provided with a temperature management system for the ECU to prevent failure of the ECU through overheating. The temperature management system comprising means for monitoring or evaluating the temperature of the ECU to determine when the temperature of the ECU is approaching a predetermined limit and means for limiting further heating of the ECU to prevent the said limit from being exceeded.

Abstract: A method and apparatus are disclosed for detecting leakage in the fuel supply to the injectors of an engine in which the individual injectors are connected to a fuel supply rail to which fuel from a reservoir is supplied under pressure by a fuel pump. The pressure within the fuel rail is monitored and it is determined when a parameter of a pressure surge in the fuel supply rail resulting from a rapid transition from high to low engine load fails to reach a reference value.

Abstract: An engine having an electronic engine control unit (ECU) is provided with a temperature management system for the ECU to prevent failure of the ECU through overheating. The temperature management system comprising means for monitoring or evaluating the temperature of the ECU to determine when the temperature of the ECU is approaching a predetermined limit and means for limiting further heating of the ECU to prevent the said limit from being exceeded.

Abstract: A system and method in which the exhaust manifold pressure is measured by a single gauge-type pressure sensor positioned in the exhaust manifold to detect misfires in all cylinders of an internal combustion engine. The pressure sensor detects the exhaust manifold pressure and feeds a signal to a microcomputer via an analog-to-digital converter. A data processing device monitors the pressure waveform created by the data from the sensor to determine if a full or partial misfire occurs. If a cylinder suffers from a partial or complete misfire, the strength of the pressure pulse for that cylinder will be reduced, thus, allowing the data processing device to identify the misfire. The data processing device may determine a misfire by computing an average peak pressure for each combustion cycle, a pressure threshold as a function of engine speed and fuel consumption rate, and a minimum pressure value based on the difference between the average peak pressure and the pressure threshold.

Abstract: A system for controlling fueling of an internal combustion engine based upon vehicle position includes a receiver associated with the vehicle that is capable of receiving position and altitude information. The vehicle includes a control computer that delivers control signals to an engine fueling system, as well as to a turbocharger control system. The control computer includes a module that receives the altitude information and uses that information to evaluate changes in ambient air pressure that might detrimentally affect turbocharger speed. In one embodiment, the control computer reduces the fueling signal to reduce engine speed in relation to a decrease in ambient air pressure accompanying an increase in vehicle elevation. In another embodiment, the control computer uses the highly accurate altitude information together with engine speed information provides signals to the turbocharger control system.

Abstract: A system for controlling fueling of an internal combustion engine includes a receiver associated with the vehicle, such as a GPS, GLONASS or LORAN-C receiver, operable to receive radio signals relating to vehicle location, a fueling system responsive to fueling signals to provide fuel to the engine and a control computer with a memory having a number of different engine fueling maps stored therein. The control computer is responsive to the radio signals to determine therefrom a geographical position of the vehicle, retrieve an appropriate one of the number of engine fueling maps from memory which corresponds to the geographical location of the vehicle, and provide the fueling signals according to the appropriate one of the number of engine fueling maps.

Abstract: An engine misfire detection system for an internal combustion engine includes a microprocessor based controller for providing an increasing fuel command signal to any cylinder in the engine. The contribution to engine speed of the particular cylinder under test is monitored and compared to the contribution to engine speed of the previous two cylinders in the firing sequence. A misfire condition is detected if the average contribution to engine speed of the cylinder under test does not exceed the greater average contribution to engine speed of the previous two cylinders by a predetermined amount after a predetermined number of engine cycles. A temporary fault is logged for the cylinder under test if such a misfire condition occurs a predetermined subsequent number of times thereafter. If such a temporary fault condition is detected during a subsequent driving cycle, a driver warning lamp is illuminated.

Abstract: An air intake heating and diagnostic system for an internal combustion engine includes a microprocessor based controller for activating electrical heating elements for a preheat time period prior to starting the engine and for a postheat time period after starting the engine. The controller receives inputs corresponding to intake manifold air temperature, battery temperature, vehicle speed, engine speed, and key switch position. The system continuously monitors the integrity of the various sensors, monitors the functionality of the heating elements during the postheat time period, and warns the vehicle operator by illuminating a "check engine" lamp if certain fault conditions are detected. In both cases, the controller sets fault flags within the controller memory corresponding to the detected fault conditions.