Abstract: A rotating power transfer system for an automotive fuel cell vehicle includes one of an impeller and turbine in fluid communication with a fuel cell stack, an electric machine and a shaft operatively associated with the one of impeller and turbine. The system also includes a heating element disposed within the shaft. The heating element is configured to be selectively electrically coupled with a stator coil of the electric machine.

Abstract: A fuel cell system has a compressor delivering compressed gas to a fuel cell stack and a control valve affecting the flow of compressed gas. A load dump condition is determined for the fuel cell stack. The flow through the compressor is increased and the additional flow diverted away from the fuel cell stack by the control valve to provide additional load for the fuel cell stack. The fuel cell stack may then be operated at a higher output power for the purpose of generating more waste heat to more rapidly warm itself.

Abstract: A fuel cell system has a compressor delivering compressed gas to a fuel cell stack and a control valve affecting the flow of compressed gas. A load dump condition is determined for the fuel cell stack. The flow through the compressor is increased and the additional flow diverted away from the fuel cell stack by the control valve to provide additional load for the fuel cell stack. The fuel cell stack may then be operated at a higher output power for the purpose of generating more waste heat to more rapidly warm itself.

Abstract: A fuel cell system has a compressor delivering compressed gas to a fuel cell stack and a control valve affecting the flow of compressed gas. A load dump condition is determined for the fuel cell stack. The flow through the compressor is increased and the additional flow diverted away from the fuel cell stack by the control valve to provide additional load for the fuel cell stack. The fuel cell stack may then be operated at a higher output power for the purpose of generating more waste heat to more rapidly warm itself.

Abstract: A rotating power transfer system for an automotive fuel cell vehicle includes one of an impeller and turbine in fluid communication with a fuel cell stack, an electric machine and a shaft operatively associated with the one of impeller and turbine. The system also includes a heating element disposed within the shaft. The heating element is configured to be selectively electrically coupled with a stator coil of the electric machine.

Abstract: A fuel cell system has a compressor delivering compressed gas to a fuel cell stack and a control valve affecting the flow of compressed gas. A load dump condition is determined for the fuel cell stack. The flow through the compressor is increased and the additional flow diverted away from the fuel cell stack by the control valve to provide additional load for the fuel cell stack. The fuel cell stack may then be operated at a higher output power for the purpose of generating more waste heat to more rapidly warm itself.

Abstract: A method is presented for idle speed control of a lean burn spark ignition internal combustion engine using a fuel-based control strategy. In particular, the idle speed control strategy involves using a combination of fuel quantity or timing and ignition timing to achieve desired engine speed or torque while maintaining the air/fuel ratio more lean than prior art systems. Depending on engine operating conditions, the fuel quantity or timing is adjusted to give a more rich air/fuel ratio in order to respond to an engine speed or torque demand increase. Additionally, due to operation close to the lean misfire limit, the spark ignition timing is adjusted away from MBT in response to an engine speed or torque demand decrease. The advantages of this fuel based control system include better fuel economy as well as fast engine response time due to the use of fuel quantity or timing and ignition timing to control engine output.

Abstract: A method is presented for idle speed control of a lean burn spark ignition internal combustion engine using a fuel-based control strategy. In particular, the idle speed control strategy involves using a combination of fuel quantity or timing and ignition timing to achieve desired engine speed or torque while maintaining the air/fuel ratio more lean than prior art systems. Depending on engine operating conditions, the fuel quantity or timing is adjusted to give a more rich air/fuel ratio in order to respond to an engine speed or torque demand increase. Additionally, due to operation close to the lean misfire limit, the spark ignition timing is adjusted away from MBT in response to an engine speed or torque demand decrease. The advantages of this fuel based control system include better fuel economy as well as fast engine response time due to the use of fuel quantity or timing and ignition timing to control engine output.

Abstract: A method is presented for idle speed control of a lean burn spark ignition internal combustion engine using a fuel-based control strategy. In particular, the idle speed control strategy involves using a combination of fuel quantity or timing and ignition timing to achieve desired engine speed or torque while maintaining the air/fuel ratio more lean than prior art systems. Depending on engine operating conditions, the fuel quantity or timing is adjusted to give a more rich air/fuel ratio in order to respond to an engine speed or torque demand increase. Additionally, due to operation close to the lean misfire limit, the spark ignition timing is adjusted away from MBT in response to an engine speed or torque demand decrease. The advantages of this fuel based control system include better fuel economy as well as fast engine response time due to the use of fuel quantity or timing and ignition timing to control engine output.