Abstract: A coordinated torque control (CTC) system is provided that includes an engine capacity module, a multi-pulse enable module, and a catalyst light off torque reserve module. The engine capacity module determines a torque capacity of an engine and generates a maximum engine torque capacity signal. The multi-pulse enable module enables a multi-pulse mode that includes the injection of at least two pulses of fuel into a cylinder of the engine during a combustion cycle. The multi-pulse enable module generates a multi-pulse desired signal to operate in the multi-pulse mode based on the maximum engine torque capacity signal, a catalyst light off signal, and a brake torque request signal. The catalyst light off torque reserve module generates a torque reserve corrected signal based on the multi-pulse desired signal.

Abstract: A diagnostic system for a pressure sensor includes a fuel pump module and a diagnostic control module. The fuel pump module activates a first pump and deactivates a second pump when an engine is operating in a diagnostic mode. The first pump supplies fuel to the second pump and the second pump supplies fuel to fuel injectors of the engine via a fuel rail. The diagnostic control module receives a measured pressure signal from a pressure sensor that indicates a pressure of the fuel rail during the diagnostic mode. The diagnostic control module detects a fault of the pressure sensor based on a comparison between the measured pressure signal and the commanded pressure signal for the first pump.

Abstract: A diagnostic system includes a fuel pump module and a diagnostic control module. The fuel pump module activates a first pump when an engine is operating in a diagnostic mode. The first pump supplies fuel to fuel injectors of the engine via a fuel rail. The diagnostic control module receives a measured pressure signal from a pressure sensor that indicates a pressure of the fuel rail during the diagnostic mode. The fuel pump module sends at least one of a first and a second commanded fuel pressure signal to the first pump based on a predetermined relief pressure of a pressure relief valve. The diagnostic control module detects a fault of the pressure sensor based on an engine speed and a comparison between the measured pressure signal and at least one of the first commanded fuel pressure signal and a corrected relief pressure of the pressure relief valve.

Abstract: A control system is provided and includes a catalyst module that generates a multi-mode enable signal based on a catalyst light off enable signal. A transition control module controls transitions between a single pulse mode and multi-pulse mode based on the multi-mode enable signal. The transition control module receives a first torque signal and generates a second torque signal based on the first torque signal. The engine torque control module generates an air per cylinder signal, a throttle area signal, and a spark timing signal based on the second torque signal. The single pulse mode is associated with a single fuel injection pulse per combustion cycle. The multi-pulse mode is associated with multiple fuel injection pulses per combustion cycle.

Abstract: A coordinated torque control system includes a catalyst module that generates a multi-mode enable signal based on a catalyst light off enable signal. A torque reserve module generates a torque reserve signal based on the multi-mode enable signal, an engine speed signal and an air per cylinder signal. The torque reserve module operates in a multi-pulse mode that is associated with injecting N pulses of fuel into a combustion chamber during a combustion cycle of the engine based on the multi-mode enable signal. N is an integer greater than or equal to 2.

Abstract: A diagnostic system includes a fuel pump module and a diagnostic control module. The fuel pump module activates a first pump when an engine is operating in a diagnostic mode. The first pump supplies fuel to fuel injectors of the engine via a fuel rail. The diagnostic control module receives a measured pressure signal from a pressure sensor that indicates a pressure of the fuel rail during the diagnostic mode. The fuel pump module sends at least one of a first and a second commanded fuel pressure signal to the first pump based on a predetermined relief pressure of a pressure relief valve. The diagnostic control module detects a fault of the pressure sensor based on an engine speed and a comparison between the measured pressure signal and at least one of the first commanded fuel pressure signal and a corrected relief pressure of the pressure relief valve.

Abstract: A diagnostic system for a pressure sensor includes a fuel pump module and a diagnostic control module. The fuel pump module activates a first pump and deactivates a second pump when an engine is operating in a diagnostic mode. The first pump supplies fuel to the second pump and the second pump supplies fuel to fuel injectors of the engine via a fuel rail. The diagnostic control module receives a measured pressure signal from a pressure sensor that indicates a pressure of the fuel rail during the diagnostic mode. The diagnostic control module detects a fault of the pressure sensor based on a comparison between the measured pressure signal and the commanded pressure signal for the first pump.

Abstract: A method comprises operating an engine of a vehicle to provide output torque to an input of a torque converter, determining whether the engine is in a cold start condition, fixing an input shaft of a transmission when the engine is in the cold start condition, and coupling the input shaft of the transmission to an output of the torque converter. A control module comprises a combustion control module that operates an engine of a vehicle to provide output torque to an input of a torque converter, a NPD module that determines whether the engine is in a cold start condition, and a transmission control module that fixes an input shaft of a transmission when the engine is in the cold start condition, wherein the input shaft of the transmission is in communication with an output of the torque converter.

Abstract: A coordinated torque control system includes a catalyst module that generates a multi-mode enable signal based on a catalyst light off enable signal. A torque reserve module generates a torque reserve signal based on the multi-mode enable signal, an engine speed signal and an air per cylinder signal. The torque reserve module operates in a multi-pulse mode that is associated with injecting N pulses of fuel into a combustion chamber during a combustion cycle of the engine based on the multi-mode enable signal. N is an integer greater than or equal to 2.

Abstract: A control system is provided and includes a catalyst module that generates a multi-mode enable signal based on a catalyst light off enable signal. A transition control module controls transitions between a single pulse mode and multi-pulse mode based on the multi-mode enable signal. The transition control module receives a first torque signal and generates a second torque signal based on the first torque signal. The engine torque control module generates an air per cylinder signal, a throttle area signal, and a spark timing signal based on the second torque signal. The single pulse mode is associated with a single fuel injection pulse per combustion cycle. The multi-pulse mode is associated with multiple fuel injection pulses per combustion cycle.

Abstract: A coordinated torque control (CTC) system is provided that includes an engine capacity module, a multi-pulse enable module, and a catalyst light off torque reserve module. The engine capacity module determines a torque capacity of an engine and generates a maximum engine torque capacity signal. The multi-pulse enable module enables a multi-pulse mode that includes the injection of at least two pulses of fuel into a cylinder of the engine during a combustion cycle. The multi-pulse enable module generates a multi-pulse desired signal to operate in the multi-pulse mode based on the maximum engine torque capacity signal, a catalyst light off signal, and a brake torque request signal. The catalyst light off torque reserve module generates a torque reserve corrected signal based on the multi-pulse desired signal.

Abstract: A method comprises operating an engine of a vehicle to provide output torque to an input of a torque converter, determining whether the engine is in a cold start condition, fixing an input shaft of a transmission when the engine is in the cold start condition, and coupling the input shaft of the transmission to an output of the torque converter. A control module comprises a combustion control module that operates an engine of a vehicle to provide output torque to an input of a torque converter, a NPD module that determines whether the engine is in a cold start condition, and a transmission control module that fixes an input shaft of a transmission when the engine is in the cold start condition, wherein the input shaft of the transmission is in communication with an output of the torque converter.

Abstract: An engine control system that regulates fuel to an engine after lean idle operation includes a first module that determines a rich mass fuel rate based on a lean operation mass air flow and a stoichiometric air to fuel ratio (AFR) and that calculates a time rich based on the rich mass fuel rate. A second module regulates fuel to the engine during a rich operation period after the lean idle operation to provide the rich mass fuel rate for the time rich.

Abstract: An excess oxygen reduction system includes a fuel cut-off condition module, an injector module, and a valve module. The fuel cut-off condition module determines whether a fuel cut-off condition exists. The injector module prevents a fuel injector from fueling a cylinder when said fuel cut-off condition exists. The valve module closes an impulse charging valve when said fuel cut-off condition exists.

Abstract: A method of estimating composition of fuel in the fuel tank of a vehicle. A refuel event is detected. Fuel consumption is monitored during a plurality of stages after the refuel event. A plurality of fuel trim shift values are determined relative to the stages. The fuel trim shift values are used to estimate a fuel composition change. This method eliminates a need for a hardware fuel composition sensor and also provides dynamic filtering of fuel trim values.