Abstract: An oxygen storage capacity (OSC) monitoring system for a vehicle having a catalytic converter includes a control module that determines a measured OSC based on an inlet sensor signal (ISS) that is responsive to an oxygen content of exhaust flowing into the catalytic converter. The control module determines a normalization ratio based the measured OSC and determines a PASS/FAIL status of the catalytic converter based on the normalization ratio.

Abstract: A method of monitoring air flow restriction in an air intake of an internal combustion engine includes recording a predetermined number of pre-throttle pressure samples, recording a predetermined number of mass air flow samples, which respectively correspond to the pre-throttle pressure samples and determining a slope based on the pre-throttle pressure samples and the mass air flow samples. Whether an air filter is inducing an air flow over restriction is determined based on the slope.

Abstract: A diagnostic cold start emissions control system for an internal combustion engine includes a control module having a calculated engine-out energy module, an engine-out energy residual module, and a diagnostic system evaluation module. The calculated engine-out energy module is in communication with the engine-out energy residual module and is configured to determine an operating engine-out energy flow based on an operating engine torque. The engine-out energy residual module is in communication with the diagnostic system evaluation module and is configured to determine an engine-out energy residual based on the determined engine-out energy flow and an expected engine-out energy flow. The diagnostic system evaluation module is configured to determine whether the determined engine-out energy residual meets a predetermined value indicative of proper cold start emissions control.

Abstract: A method of monitoring air flow restriction in an air intake of an internal combustion engine includes monitoring a plurality of manifold absolute pressure (MAP) samples and determining respective MAP thresholds corresponding to each of the MAP samples. Each of the MAP samples is compared to its respective MAP threshold. A percentage of failed MAP samples is determined based on the comparing and an over-restricted air intake condition is selectively indicated based on the percentage of failed MAP samples.

Abstract: An engine idle fault control system that identifies a source of rough idle in an engine includes a first module that monitors an idle speed of the engine and that generates a rough idle signal, and a second module that monitors a fuel control parameter. A third module determines a source of rough idle based on the fuel control parameter and the rough idle signal.

Abstract: A rough road detection system includes an engine speed module, a feature space module, a normalization module, and a rough road module. The engine speed module generates an engine speed signal based on a crank signal. The feature space module generates a feature space signal based on the engine speed signal. The normalization module generates a normalized signal. The normalized signal is based on the feature space signal and a normalization value that varies in accordance with the engine speed signal. The rough road module determines whether a rough road condition exists based on the normalized signal.

Abstract: A liquid fuel detection system for a fuel vapor system of a vehicle providing fuel vapor to an engine operating in closed loop includes an oxygen sensor that generates an oxygen signal based on an oxygen level in engine exhaust. An engine speed sensor generates a speed signal based on a speed of the engine. And a control module receives the oxygen signal and the speed signal, determines a fuel control factor based on the oxygen signal, determines a long term modifier based on long term changes of the fuel control factor, and detects the presence of liquid fuel in the fuel vapor system based on the fuel control factor, the speed signal, and the long term modifier.

Abstract: A method of determining whether a fault condition of an intake air temperature (IAT) sensor of an engine is present includes estimating a first intake charge temperature (ICT) based on an estimated first ICT and a previously estimated first mass air flow (MAF) and estimating a second ICT based on a previously estimated second ICT and a currently measured MAF. An IAT difference is determined based on the first ICT and the second ICT. Whether the fault condition of the IAT sensor is present is determined based on the IAT difference.

Abstract: A method of diagnosing a malfunction of a tuning valve of an intake manifold coupled to an internal combustion engine is provided. The method includes: commanding the tuning valve to at least one of a closed and an opened position; computing an average deviation of manifold absolute pressure; determining an average deviation threshold using fuzzy logic based on engine speed and airflow per cylinder; comparing the average deviation to the average deviation threshold; and diagnosing a malfunction of the tuning valve based on a comparison of the average deviation and the average deviation threshold.

Abstract: An engine control system for regulating operation of an engine having a throttle includes a first module that determines an intermediate parameter based on engine operating parameters and a second module that determines a pressure upstream of the throttle based on the intermediate parameter. A third module regulates operation of the engine based on the pressure. The engine operation is regulated based on a pre-determined relationship between a throttle position and an effective throttle area.

Abstract: A method of diagnosing a malfunction of a charge motion control valve coupled to an intake manifold of an internal combustion engine is provided. The method includes: commanding the valve to at least one of close and open; determining a pressure range using fuzzy logic based on a mass of air flowing into the intake manifold and a temperature of the air flowing into the intake manifold; determining a change in absolute pressure of the intake manifold; comparing the change in absolute pressure to the pressure range; and diagnosing a malfunction of the valve when the change in absolute pressure is within the pressure range.

Abstract: A method of diagnosing a malfunction of a charge motion control valve coupled to an intake manifold of an internal combustion engine is provided. The method includes: commanding the valve to at least one of close and open; determining a pressure range using fuzzy logic based on a mass of air flowing into the intake manifold and a temperature of the air flowing into the intake manifold; determining a change in absolute pressure of the intake manifold; comparing the change in absolute pressure to the pressure range; and diagnosing a malfunction of the valve when the change in absolute pressure is within the pressure range.

Abstract: An exhaust gas recirculation (EGR) valve positioning system that positions an EGR valve pintle includes a predicted temperature fuzzy logic module, an under heat fuzzy logic module, an over heat fuzzy logic module, and a multiplication module. The predicted temperature fuzzy logic module determines a predicted temperature of the pintle and generates a predicted temperature modifier based thereon. The under heat fuzzy logic module generates an under heat modifier representing the temperature of the pintle during warmup of an engine. The over heat fuzzy logic module generates an over heat modifier representing the temperature of the pintle after warmup of the engine. The multiplication module communicates with the predicted temperature fuzzy logic module, the under heat fuzzy logic module, and the over heat fuzzy logic module and generates a modifier signal based on the product of the predicted temperature modifier, the under heat modifier, and the over heat modifier.

Abstract: An engine control system that monitors flow restriction through an exhaust gas recirculation (EGR) system of an engine includes a first module that calculates a test EGR mass flow rate based on a first average EGR mass flow rate when the EGR system is in an EGR OFF mode and a second average EGR mass flow rate when the EGR system is in an EGR ON mode. A second module selectively generates a fault signal based on the test EGR mass flow rate.

Abstract: An exhaust gas recirculation (EGR) valve positioning system that positions an EGR valve pintle includes a predicted temperature fuzzy logic module, an under heat fuzzy logic module, an over heat fuzzy logic module, and a multiplication module. The predicted temperature fuzzy logic module determines a predicted temperature of the pintle and generates a predicted temperature modifier based thereon. The under heat fuzzy logic module generates an under heat modifier representing the temperature of the pintle during warmup of an engine. The over heat fuzzy logic module generates an over heat modifier representing the temperature of the pintle after warmup of the engine. The multiplication module communicates with the predicted temperature fuzzy logic module, the under heat fuzzy logic module, and the over heat fuzzy logic module and generates a modifier signal based on the product of the predicted temperature modifier, the under heat modifier, and the over heat modifier.

Abstract: An engine control system that monitors flow restriction through an exhaust gas recirculation (EGR) system of an engine includes a first module that calculates a test EGR mass flow rate based on a first average EGR mass flow rate when the EGR system is in an EGR OFF mode and a second average EGR mass flow rate when the EGR system is in an EGR ON mode. A second module selectively generates a fault signal based on the test EGR mass flow rate.

Abstract: An engine idle fault control system that identifies a source of rough idle in an engine includes a first module that monitors an idle speed of the engine and that generates a rough idle signal, and a second module that monitors a fuel control parameter. A third module determines a source of rough idle based on the fuel control parameter and the rough idle signal.

Abstract: A vacuum signal diagnostic system that diagnoses operation of a vacuum sensor of a brake booster system that is in fluid communication with an engine includes a first module that determines whether a vacuum signal of the vacuum sensor is increasing and a second module that compares an engine vacuum signal of the engine to the vacuum signal. A third module indicates a HI fault of the vacuum sensor when the vacuum sensor is increasing and a difference between the engine vacuum signal and the vacuum signal is greater than zero for a first threshold time.

Abstract: An oxygen storage capacity (OSC) monitoring system for a vehicle having a catalytic converter includes an inlet oxygen sensor that generates an inlet sensor signal (ISS) based on an oxygen content of exhaust flowing into the catalytic converter. A control module receives the ISS, increases a closed loop fuel control gain during a first period and determines a fuel control factor based on the ISS during the first period. The control module determines an OSC when an average value of the fuel control factor is greater than a first value and is less than a second value during the first period.

Abstract: The present invention discloses a call access control (CAC) method applicable to call access during call initiation and cell switching in TDD-CDMA mobile communication system. The method comprises: counting the number of accessed subscribers in all current communication time slots of the home base station for an access request from a new subscriber, to determine channel resource occupations in different time slots; comparing the channel resource occupations in the different time slots, and then allocating idle resource units in the time slots having available channel resources and the minimum number of accessed subscribers to the subscriber sending the access request. The present invention achieves dynamic allocation of channel resources in cells and have an advantage of simple implementation and applicability.