Patent application number | Description | Published |
20080319600 | Intake air temperature rationality diagnostic - A method of determining whether a fault condition of an intake air temperature (IAT) sensor of an engine is present includes estimating a first manifold absolute pressure (MAP) based on a previously estimated first MAP and an estimated first mass air flow (MAF) as a function of the previously estimated first MAP and estimating a second MAP based on a previously estimated second MAP and a currently measured MAF. An IAT difference is determined based on the first MAP and the second MAP. Whether the fault condition of the IAT sensor is present is determined based on the IAT difference. | 12-25-2008 |
20090025469 | ADAPTIVE BAROMETRIC PRESSURE ESTIMATION - A method of determining a barometric pressure of atmosphere, in which an internal combustion engine of a vehicle is located includes monitoring operating parameters of the internal combustion engine and the vehicle, determining a healthy status of an air filter of the internal combustion engine, and calculating the barometric pressure based on the operating parameters and the healthy status of the air filter. | 01-29-2009 |
20090187301 | Detection of Engine Intake Manifold Air-Leaks - A method of determining an engine intake air leak may include measuring an air flow rate into an internal combustion engine, comparing the measured air flow rate to a first predetermined air flow limit, calculating an estimated air flow rate into the engine when the measured air flow rate is less than the first predetermined air flow limit, comparing the estimated air flow rate to second and third predetermined air flow limits, and indicating an air leak when the estimated air flow rate is greater than the second predetermined air flow limit and less than the third predetermined air flow limit. | 07-23-2009 |
20100222982 | TORQUE MODEL-BASED COLD START DIAGNOSTIC SYSTEMS AND METHODS - A control system for an engine having a catalytic converter includes an energy calculation module that calculates a calculated mass air flow (MAF) of intake air of the engine based on a requested torque and a requested spark timing that correspond to a desired thermal energy of exhaust of the engine, and that determines an expected thermal energy of the exhaust based on the calculated MAF, and an energy residual module that determines a thermal energy residual of the exhaust based on the expected thermal energy and an estimated thermal energy of the exhaust, wherein the estimated thermal energy is based on a measured MAF of the intake air. The control system includes an energy evaluation module that determines a diagnostic result that indicates whether the catalytic converter is operating within a target temperature range based on the thermal energy residual. Related control methods are also provided. | 09-02-2010 |
20100242582 | SYSTEMS AND METHODS FOR ENGINE FUEL CONTROL - An engine system includes a status determination module and an open-loop fuel control module. The status determination module determines whether a first ignition fuse is in a failure state. The open-loop fuel control module disables a first plurality of fuel injectors and actuates a second plurality of fuel injectors based on a first air/fuel (A/F) ratio when the first ignition fuse is in the failure state, wherein the first ignition fuse and the first plurality of fuel injectors correspond to a first cylinder bank, and wherein a second ignition fuse and the second plurality of fuel injectors correspond to a second cylinder bank. | 09-30-2010 |
20110192220 | RESTRICTED FILTER DIAGNOSTIC SYSTEM AND METHOD - A restriction diagnostic system for a vehicle comprises a pressure difference module and a diagnostic module. The pressure difference module determines a pressure difference between an ambient air pressure and a filtered air pressure measured at a location between an air filter and a valve that is selectively opened to enable ambient airflow through the air filter to a fuel vapor canister. The diagnostic module selectively diagnoses restriction of the airflow through the air filter when the pressure difference is greater than a predetermined pressure. | 08-11-2011 |
20110315127 | LOW PURGE FLOW VEHICLE DIAGNOSTIC TOOL - A vehicle includes an engine, a sealed fuel system having a fuel tank, a canister for storing fuel vapor, a vapor circuit external to the fuel tank, and a control valve. The vapor circuit includes an absolute pressure sensor and a switching valve connecting the fuel tank to the control valve. A controller evaluates or diagnoses a vapor purge function of the sealed fuel system using vacuum measurements from the absolute pressure sensor, executing or diagnosing only when the engine is running, purge is enabled, and the pump is off. The controller diagnoses the vapor purge function by comparing the vacuum measurements to a threshold vacuum. An apparatus includes the vapor circuit and controller. A method for diagnosing the vapor purge function includes actuating the switching valve, measuring a vacuum in the system using the absolute pressure sensor, and comparing the measured vacuum to a threshold vacuum. | 12-29-2011 |
20130312496 | System and Method of Implementing a Low Pressure Charcoal Canister - A portion of a fuel system of a vehicle is disclosed. The portion of the fuel system includes an evaporative emissions leak check system selectively fluidly-connected to an evaporative emissions system. The evaporative emissions leak check system includes a vacuum source. The evaporative emissions system includes a canister and a first fluid conduit fluidly-connecting the canister to the fuel tank. The portion of the fuel system also includes a vent valve that demarcates the first fluid conduit to include a first fluid conduit segment extending from the canister and a second fluid conduit segment extending from the fuel tank. The arrangement of the vent valve in an open orientation permits fluid communication of the canister with the fuel tank by way of the first fluid conduit. The arrangement of the vent valve in the closed orientation fluidly-isolates the canister from the fuel tank. A method is also disclosed. | 11-28-2013 |
20130312713 | Apparatus and Method of Determining a Leak Condition of a Fuel System - A portion of a fuel system of a vehicle is disclosed. The vehicle includes a motor-generator-starter connected to an engine. The fuel system includes a fuel tank connected to the engine. The portion of the fuel system includes an evaporative emissions system and an evaporative emissions leak check system connected to the evaporative emissions system. The evaporative emissions leak check system includes a vacuum source. The vacuum source includes the motor-generator-starter connected to the engine. The motor-generator-starter actuates the engine when the vehicle is operated in a non-moving, keyed-off condition for creating a vacuum within an intake manifold of the engine. A method is also disclosed. | 11-28-2013 |
20130312834 | Apparatus and Method of Determining a Leak Condition of a Fuel System - A portion of a fuel system of a vehicle is disclosed. The vehicle includes a brake system. The fuel system includes a fuel tank connected to an engine. The portion of the fuel system includes an evaporative emissions system and an evaporative emissions leak check system selectively fluidly-connected to the evaporative emissions system. The evaporative emissions leak check system includes a vacuum source. The vacuum source includes a vacuum pump connected to a brake boost device that provides power braking to the brake system of the vehicle. A method is also disclosed. | 11-28-2013 |
20130312838 | Component of a Fuel System, Fuel System and Method for Operating the Same - A component of a fuel system includes a fuel cap having a head portion connected to a neck portion. The head portion defines: a fluid pressure relief conduit and a relief valve passage that extends into and through the head portion that terminates at a valve head opening formed by an inner surface of the head portion. The inner surface of the head portion and the inner surface of the neck portion cooperate to form a fuel cap cavity. The fluid cap cavity is fluidly-connected to the fluid pressure relief conduit by way of the valve head opening formed by the inner surface of the head portion. A relief valve is movably arranged within the relief valve passage for permitting selective fluid communication of the fuel cap cavity with the fluid pressure relief conduit. A locking apparatus is arranged within the fuel cap cavity. | 11-28-2013 |