A control device of a hybrid vehicle including an engine, an electric motor coupled to a power transmission path between the engine and drive wheels, and a clutch connecting/disconnecting a power transmission path between the engine and both the electric motor and the drive wheels, the control device performing detection of air-fuel ratio variation between cylinders of the engine, the control device changing an operation state of the clutch based on a request drive force of the vehicle, and the control device performing the detection of air-fuel ratio variation when the clutch is in an open state or a slip amount of the clutch is equal to or larger than a preset value.

A control device of a hybrid vehicle including an engine, an electric motor coupled to a power transmission path between the engine and drive wheels, and a clutch connecting/disconnecting a power transmission path between the engine and both the electric motor and the drive wheels, the control device performing detection of air-fuel ratio variation between cylinders of the engine, the control device changing an operation state of the clutch based on a request drive force of the vehicle, and the control device performing the detection of air-fuel ratio variation when the clutch is in an open state or a slip amount of the clutch is equal to or larger than a preset value.

Systems and methods for operating a driveline of a hybrid vehicle are presented. In one example, the systems and methods adjust a driveline disconnect clutch boost time duration or magnitude responsive to a pressure error and a time delay error. A driveline disconnect clutch may be operated via supplying a pressure to the driveline disconnect clutch that includes the adjusted boost time duration or magnitude.

Systems and methods for operating a driveline of a hybrid vehicle are presented. In one example, the systems and methods adjust a driveline disconnect clutch boost time duration or magnitude responsive to a pressure error and a time delay error. A driveline disconnect clutch may be operated via supplying a pressure to the driveline disconnect clutch that includes the adjusted boost time duration or magnitude.

A hybrid drive system has a battery and a combustion engine for energy sources. The system has a traction motor, a generator, a variable voltage converter (VVC), a motor inverter, a generator inverter, a bus coupling the VVC to the inverters, and a controller. The controller regulates engine speed, motor torque, and generator torque. The engine speed is determined according to a driver torque demand. In normal conditions, 1) the controller regulates the engine speed by modifying a generator torque command, and 2) the bus voltage is regulated using the VVC and battery. When the controller detects a fault in which the battery and VVC become unavailable for regulating the bus voltage, then the controller regulates a motor inverter power output to match a sum of a generator inverter power output and an estimated power loss of the inverters in order to regulate the bus voltage.

A hybrid drive system has a battery and a combustion engine for energy sources. The system has a traction motor, a generator, a variable voltage converter (VVC), a motor inverter, a generator inverter, a bus coupling the VVC to the inverters, and a controller. The controller regulates engine speed, motor torque, and generator torque. The engine speed is determined according to a driver torque demand. In normal conditions, 1) the controller regulates the engine speed by modifying a generator torque command, and 2) the bus voltage is regulated using the VVC and battery. When the controller detects a fault in which the battery and VVC become unavailable for regulating the bus voltage, then the controller regulates a motor inverter power output to match a sum of a generator inverter power output and an estimated power loss of the inverters in order to regulate the bus voltage.

A hybrid vehicle evaporation system may include a fuel tank having a fuel level sensor, a refuel button, and a controller. The controller may be programmed to disable HV charging in response to a selection of the refuel button, monitor a fuel level received from the fuel level sensor, and enable HV charging in response to the fuel level failing to increase for a predetermined amount of time.

A hybrid vehicle evaporation system may include a fuel tank having a fuel level sensor, a refuel button, and a controller. The controller may be programmed to disable HV charging in response to a selection of the refuel button, monitor a fuel level received from the fuel level sensor, and enable HV charging in response to the fuel level failing to increase for a predetermined amount of time.

A hybrid electric vehicle includes an engine and an electric machine, both capable of providing torque to transmission gearing. A clutch is disposed between the engine and the electric machine and is configured to selectively couple the engine to the electric machine. At times in which control of the amount of engine torque transmitted to the gearing is desirable, a controller is programmed to slip the clutch. If the controller is able to determine the amount of torque transmitted through the slipping clutch, the controller alters an output of the electric machine based upon the torque through the clutch. If, however, the controller is unable to determine the amount of torque transmitted through the slipping clutch, the controller alters the output of the electric machine based upon an acceleration of the electric machine.

A hybrid electric vehicle includes an engine and an electric machine, both capable of providing torque to transmission gearing. A clutch is disposed between the engine and the electric machine and is configured to selectively couple the engine to the electric machine. At times in which control of the amount of engine torque transmitted to the gearing is desirable, a controller is programmed to slip the clutch. If the controller is able to determine the amount of torque transmitted through the slipping clutch, the controller alters an output of the electric machine based upon the torque through the clutch. If, however, the controller is unable to determine the amount of torque transmitted through the slipping clutch, the controller alters the output of the electric machine based upon an acceleration of the electric machine.