Abstract:
An individual driving value is set as a function of an accelerator pedal position. In turn, a powertrain characteristic is set as a function of the individual driving style. The set powertrain characteristic may be modified on the basis of a feedback value corresponding to learned preferences of a driver. The modified powertrain characteristic is then either automatically implemented for operation of a powertrain or communicated as a choice for implementation. The feedback value is updated per a response to automatic implementation or choice communication.
Abstract:
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, compensation for a driveline disconnect clutch is provided. The approaches may reduce driveline torque disturbances.
Abstract:
An apparatus and method for altering the drivability of a vehicle so as to alert a driver of the vehicle of a potentially hazardous condition. The vehicle has at least one sensor configured to detect the potentially hazardous potential. Additionally, the vehicle has a control system for directing a transmission of the vehicle to perform a transmission operation that catches the driver's attention by generating an acceleration or deceleration. The transmission operation is preferably an upshift, a downshift, an unlocking of a torque converter lockup clutch or a locking of the lockup clutch. In one embodiment, the control system directs the transmission to perform more than one transmission operation, the transmission operations defining a transmission operation cycle. In a preferred embodiment, more than one transmission operation cycle is performed. Potentially hazardous conditions include traffic in front of the vehicle, a second vehicle approaching from the rear, an upcoming curve in the road, an approaching speed limit or an upcoming banked portion of the road.
Abstract:
A method of down-shifting a transmission avoids output shaft oscillations by briefly increasing the torque capacity of an off-going element at the end of the inertia phase. The torque capacity of the off-going element is then reduced to zero when the measured transmission speed ratio begins to decrease. The method is suitable for downshifts that involve multiple off-going elements and multiple on-coming elements such as a shift from tenth gear to sixth gear in a ten speed transmission.
Abstract:
A vehicle system and a method for calculating a vehicle mass is provided. In at least one embodiment, the system and the method measure current consumed by an electric machine of the vehicle to calculate vehicle mass. A controller of the vehicle uses the calculated mass to control operation of the vehicle, for example a four wheel drive, transmission, stability control, or brake system of the vehicle. A GPS and tire speed sensor system may be incorporated to detect the presence of a towed object, for example a trailer, and to further adjust operation of the vehicle.
Abstract:
A vehicle system and a method for calculating a vehicle mass is provided. In at least one embodiment, the system and the method measure current consumed by an electric machine of the vehicle to calculate vehicle mass. A controller of the vehicle uses the calculated mass to control operation of the vehicle, for example a four wheel drive, transmission, stability control, or brake system of the vehicle. A GPS and tire speed sensor system may be incorporated to detect the presence of a towed object, for example a trailer, and to further adjust operation of the vehicle.
Abstract:
A hybrid vehicle has an engine, an electric machine connected to the engine by an upstream clutch, a transmission gearbox connected to the electric machine by a downstream clutch, and a controller. The controller is configured to, in response to a user commanded shift of the transmission, control the electric machine speed to a designated speed based on gearbox output speed and the transmission gear ratio after the shift, thereby synchronizing speeds across the gearbox for the shift. A method for controlling a hybrid vehicle provides, in response to a user commanded shift of an automatic transmission gearbox, controlling an electric machine speed to a target speed based on the transmission gear ratio after the shift where the target speed is synchronized with the transmission gearbox output speed.
Abstract:
A hybrid vehicle with an engine, an electric drive motor and battery, an automatic transmission with a torque converter having a bypass clutch, and a powertrain controller dynamically adjust the torque converter slip to balance fuel economy and drivability during a transient torque request by using motor torque to satisfy the transient torque and applying feed forward control of the fluid pressure in the bypass clutch based on the motor torque and feedback control of the slip to maintain torque converter torque ratio substantially constant during the transient event.
Abstract:
A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a powertrain source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a powertrain source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.
Abstract:
A vehicle includes an engine, an accelerator pedal, and a controller. The controller is programmed to command torque to the engine based on a set speed of adaptive cruise control and is programmed to, in response to the adaptive cruise control being active, a measured lateral acceleration of the vehicle exceeding a user-defined lateral acceleration threshold during a road curve, and the accelerator pedal being released, reduce a speed of the vehicle below the set speed until the measured lateral acceleration is less than the lateral acceleration threshold.