Patent application number | Description | Published |
20080224888 | Systems and methods for digital signal processing - A control system for a vehicle is provided. The control system includes a signal processing module that receives a sensor signal and extracts a plurality of sample points from the sensor signal. A computation module computes a summation of the sample points, computes a summation of squares of the sample points, and computes a standard deviation based on the summation of the sample points and the summation of the squares of the sample points. A control module generates a control signal based on the sensor signal and the standard deviation. | 09-18-2008 |
20080245129 | System for detecting failures in fuel systems - A diagnostic system and method for detecting failures in a fuel system of a vehicle includes a fuel level monitoring module that determines a first change in a first fuel level of a first fuel tank based on data received from a first fuel level sensor and determines a second change in a second fuel level of a second fuel tank based on data received from a second fuel level sensor. A sensor diagnosing module evaluates operation of the second fuel level sensor based on the first change in the first fuel level. | 10-09-2008 |
20080262673 | ENGINE OIL TEMPERATURE DIAGNOSTIC METHODS AND SYSTEMS - A control system for evaluating an engine oil temperature sensor is provided. The control system includes a first diagnostic module that selectively detects a first engine oil temperature sensor fault based on a comparison of engine coolant temperature, intake air temperature, and engine oil temperature. A reporting module selectively generates a fault report based on the first engine oil temperature sensor fault. | 10-23-2008 |
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 |
20090030586 | VALVETRAIN DRIVE STRETCH COMPENSATION FOR CAMSHAFT TO CRANKSHAFT CORRELATION - A method of correlating a rotational position of a crankshaft to a rotational position of a camshaft includes determining a stretch value of a timing connection, which drivingly couples the crankshaft and the camshaft, and calculating a crankshaft to camshaft rotational position value indicative of the rotational position of the crankshaft with respect to the rotational position of the camshaft. The crankshaft to camshaft rotational position value is compensated based on the stretch value to provide a compensated crankshaft to camshaft rotational position value and whether the rotational position of the crankshaft correlates to the rotational position of the camshaft is determined based on the compensated crankshaft to camshaft rotational position value. | 01-29-2009 |
20090100921 | INTAKE AIR TEMPERATURE SENSOR DIAGNOSTIC - An intake air temperature (IAT) sensor diagnostic module comprises a measured noise module, an expected noise module, an excess noise module, and an IAT fault detection module. The measured noise module measures noise in an IAT signal from an IAT sensor in a vehicle. The expected noise module determines expected noise based upon the IAT signal. The excess noise module determines an excess noise value based upon the measured noise and the expected noise. The IAT fault detection module diagnoses faults in the IAT sensor based upon a comparison of the excess noise value and a first predetermined value. | 04-23-2009 |
20090216426 | PLUG-IN HYBRID EVAP VALVE MANAGEMENT TO REDUCE VALVE CYCLING - A control module for an engine of a vehicle includes a mode determination module that determines whether the vehicle is in a fuel-saving mode based on an acceleration of the vehicle. A diurnal control valve (DCV) control module selectively closes a DCV a predetermined time after at least one of determining that the vehicle is in the fuel-saving mode and determining that the engine is stopped. | 08-27-2009 |
20090276147 | ENGINE KNOCK DIAGNOSTIC - A knock diagnostic module having a knock module that increments a sample count when a cylinder firing signal corresponding to a first cylinder is received and selectively increments a knock count based on a knock detection signal that corresponds to the cylinder firing signal of the first cylinder A knock analysis module analyzes the knock count of the first cylinder when the sample count of the first cylinder reaches a predetermined value and selectively generates an excessive knock signal when the knock count exceeds a predetermined threshold. A remedial action module selectively performs a remedial action based on the excessive knock signal. | 11-05-2009 |
20100125401 | CONTROL SYSTEMS AND METHODS FOR ESTIMATING ENGINE COOLANT HEAT LOSS - A control system for an engine includes an air calculation module that determines, based on a plurality of first coolant temperatures sensed during a period of engine operation, a first cumulative mass of intake air combusted by the engine during the period that corresponds to an estimated amount of heat dissipated by a cooling system of the engine during the period, and that determines, based on the first cumulative mass, a second cumulative mass of intake air of the engine that is required to raise a temperature of the engine from an initial temperature at a start of the period to a target temperature. The control system further includes a control module that selectively adjusts one of a diagnostic condition and an operating condition of the engine based on the second cumulative mass. A related method for controlling an engine is also provided. | 05-20-2010 |
20100192912 | METHOD AND APPARATUS FOR DETERMINING OPERATION ERRORS FOR A HIGH PRESSURE FUEL PUMP - A control system and method for controlling pump includes a pump control module communicating a drive signal to the high pressure pump and a high pressure pump in communication with the pump control module operating in response to the drive signal. A current sampling module samples a pump current signal to form a sample prior to an end of the drive signal. A current comparison module compares the sample to a threshold that may be a function of pump solenoid resistance, pump solenoid temperature, and/or system voltage, and a fault indication module generates a fault signal in response to comparing. | 08-05-2010 |
20100269793 | DIAGNOSTIC SYSTEM FOR SPARK IGNITION DIRECT INJECTION SYSTEM CONTROL CIRCUITS - An engine control system includes a driver module and a diagnostics module. The driver module includes a high-side driver and a low-side driver, which selectively actuate a load. The driver module generates status signals based on detection of each of a plurality of failure modes of the high-side and low-side drivers. The diagnostics module increments a first error count for a first mode of the plurality of failure modes when the status signals indicate the driver module has detected the first mode. The diagnostics module increments a corresponding total count each time the driver module analyzes the first mode. The diagnostics module sets a fail state for a diagnostic trouble code (DTC) when the first error count for the first mode reaches a first predetermined threshold prior to the total count reaching a second predetermined threshold. | 10-28-2010 |
20100274442 | CONTROL SYSTEM AND METHOD FOR SENSOR SIGNAL OUT OF RANGE DETECTION - A method and control module for determining a sensor error includes a time-based diagnostic module generating a time-based diagnostic for a sensor and an event-based diagnostic module generating an event-based diagnostic for the sensor. A synchronizing module synchronizes the time-based diagnostic and the event-based diagnostic to obtain a diagnostic result. A fault indicator module generates a fault signal in response to the diagnostic result. | 10-28-2010 |
20110106411 | SYSTEMS AND METHODS FOR DIAGNOSING OXYGEN SENSORS AND CATALYTIC CONVERTERS OF EXHAUST SYSTEMS - A diagnostic system for an engine includes a stage transition module and a control module. The stage transition module generates a command signal based on a fuel control signal. The command signal commands a fuel system of the engine to intrusively transition between rich and lean states during a diagnostic test that includes first, second, and third stages. The first, second, and third stages are defined based on transitions between the rich and lean states. The control module during the second and third stages detects: an error with a first oxygen sensor based on a comparison between the command signal and a first oxygen signal from the first oxygen sensor; an error with a second oxygen sensor based on a second oxygen signal from the second oxygen sensor; and an error with a catalytic converter based on the first and second oxygen signals and a manifold absolute pressure signal. | 05-05-2011 |
20120072060 | METHOD OF MONITORING IN-USE PERFORMANCE RATIOS OF ONBOARD DIAGNOSTIC SYSTEMS FOR PLUG-IN HYBRID ELECTRIC VEHICLES - A method of monitoring an onboard diagnostic system for a plug-in hybrid electric vehicle includes incrementing the denominator of an N/D ratio for the onboard diagnostic system only when a total time criteria, a vehicle speed criteria and an idle criteria are satisfied after an internal combustion engine of the vehicle has been fueled. The diagnostic system performance is summarized into a single N/D ratio. When an underperforming ratio is identified, the system controls the engine to provide more engine operation and subsequent diagnostic observability. The denominator of the N/D ratio is compared to a verification denominator to identify vehicles that are typically operated in a manner such that an engine-on cycle does not begin, or is not identified, until very near the end of the drive cycle, thereby preventing the denominator and a numerator of the N/D ratio from incrementing, and thereby providing a false passing performance ratio. | 03-22-2012 |
20120079873 | LARGE LEAK DIAGNOSTIC TOOL FOR A SEALED FUEL SYSTEM IN A VEHICLE - A vehicle includes a sealed fuel system and a controller. The fuel system includes a fuel tank, a fuel cap, a control orifice, and an absolute pressure sensor. The controller associates a threshold large leak in the fuel system with a fuel cap sealing error. The controller detects completion of a prior refueling event, compares measurements from the pressure sensor to a reference vacuum across the control orifice to determine the presence of the threshold large leak, and sets a diagnostic code corresponding to the large leak only upon completion of the prior refueling event. A method for detecting the large leak includes detecting completion of the refueling event, comparing vacuum measurements from the absolute pressure sensor to a reference vacuum across the orifice to determine the presence of the large leak, and setting a diagnostic code corresponding to the large leak only upon completion of the prior refueling event. | 04-05-2012 |
20120191295 | METHOD OF DETECTING AN IN-RANGE FAILURE OF A BRAKE PEDAL POSITION SENSOR - A method of detecting an in-range failure of a brake pedal position sensor includes calculating the difference between a minimum position and a maximum position of the brake pedal position sensor. The calculated difference is weighted to define a fast test weighted input value and/or a full test weighted input value. A cumulative test result value is incremented by the fast test weighted input value and/or the full test weighted input value. The cumulative test result value is filtered to define a moving average of the cumulative test result value after each incremented occurrence. The moving average of the cumulative test result value is tracked to determine if the brake pedal position sensor is functioning properly. | 07-26-2012 |
20120280819 | EFFICIENCY DETERMINATION FOR A SELECTIVE-CATALYTIC-REDUCTION CATALYST - A method of assessing overall efficiency of a selective-catalytic-reduction catalyst includes monitoring instantaneous efficiency of the catalyst. The method also includes determining the overall efficiency by summing instantaneous efficiency values weighted by a first set of coefficients if the most recent instantaneous efficiency value is above an instantaneous efficiency threshold. The method additionally includes determining the overall efficiency by summing instantaneous efficiency values weighted by a second set of coefficients if the most recent instantaneous efficiency value is equal to or below the instantaneous efficiency threshold. Furthermore, the method includes determining whether the overall efficiency has dropped below an overall efficiency threshold and reporting when the overall efficiency has dropped below the overall efficiency threshold. The second set of coefficients weighs the most recent instantaneous efficiency value more heavily than preceding instantaneous efficiency values as compared with the first set of coefficients. A system and a vehicle are also disclosed. | 11-08-2012 |
20130263577 | NON-METHANE HYDROCARBON CONVERSION EFFICIENCY DIAGNOSTIC FOR A DIESEL AFTER-TREATMENT SYSTEM - A method of assessing non-methane hydrocarbon (NMHC) conversion efficiency in a diesel after-treatment (AT) system having a diesel oxidation catalyst (DOC) arranged upstream of a diesel particulate filter (DPF) includes regenerating the AT system. Additionally, the method monitors DOC inlet and outlet temperatures during the regeneration. The method also assesses whether the DOC is operating at or above threshold efficiency by determining a DOC inlet/outlet temperature difference and comparing the determined inlet/outlet temperature difference with a threshold inlet/outlet temperature difference. The method also monitors DPF outlet temperature if the DOC is operating at or above the threshold efficiency and determines a DOC temperature/DPF outlet temperature difference. The method additionally assesses whether NMHC conversion efficiency of the DPF is at or above a threshold value by comparing the determined DOC temperature/DPF outlet temperature difference with a threshold DOC temperature/DPF outlet temperature difference. A system and a vehicle are also disclosed. | 10-10-2013 |
20130263591 | NITROGEN DIOXIDE GENERATION DIAGNOSTIC FOR A DIESEL AFTER-TREATMENT SYSTEM - A method for assessing NO | 10-10-2013 |
20140025249 | DIAGNOSTIC SYSTEM AND METHOD FOR PROCESSING CONTINUOUS AND INTERMITTENT FAULTS - A method for diagnosing a device of a vehicle, includes: generating samples of a parameter of the device; indicating whether each of the samples passed or failed based on comparisons of the samples with one of a predetermined value and a predetermined range; tracking a first number of consecutive samples compared, a second number of the first number of samples that failed, a third number of the first number of samples that failed consecutively, and a fourth number of a last predetermined number of samples compared that failed; selecting one of a normal control mode, a temporary default action mode and a permanent default action mode based on the first, second, third, and fourth numbers; and selectively setting a diagnostic trouble code (DTC) in memory when in the permanent default action mode. | 01-23-2014 |
20140352658 | SYSTEM AND METHOD TO DIAGNOSE FUEL SYSTEM PRESSURE SENSOR - A system includes an ignition detection module, a pressure sensor, a pressure variation module, and a pressure sensor diagnostic module. The ignition detection module detects when an engine is started. The pressure sensor generates a first pressure signal indicating a first pressure within a fuel system of the engine when the engine is started and when a purge valve of the fuel system is closed. The pressure variation module determines an amount of variation in the first pressure signal over a first period. The pressure sensor diagnostic module determines a state of the pressure sensor based on the amount of variation in the first pressure signal over the first period. | 12-04-2014 |