Abstract:
A system and method is disclosed for engine starting and transmission shifting where a controller may be operable to decrease a torque of a motor and operate a starter-generator (ISG) to start an engine responsive to a command to shift the transmission and start the engine. The controller may disengage a second clutch and subsequently shift the transmission to a target gear ratio speed responsive to the torque of the motor achieving zero. The controller may increase respective torques of the motor, ISG, and engine to drive a speed of the motor, ISG, and engine toward a target speed defined by the target gear speed responsive to completion of the shift. The controller may engage the second clutch responsive to the speed of the motor achieving the target speed and engage a disconnect clutch responsive to the respective speeds of the ISG and engine achieving the target speed.
Abstract:
A hybrid powertrain includes an engine having a crankshaft, and an electric motor having a rotor selectively coupled to the crankshaft via a disconnect clutch. The powertrain further includes a transmission having a torque converter that has an impeller fixed to the rotor. A controller is configured to, in response to the engine starting, generate a torque command for the motor that defines a magnitude that is based on a difference between a target impeller speed and a measured impeller speed.
Abstract:
A system and method for modifying the engine pull-up (EPU) logic within a hybrid vehicle based on max motor torque that accounts for the drop or change in available motor torque due to the opening/slipping of a torque converter bypass clutch during engine starts is disclosed. An engine pull-up threshold is determined from max available motor torque at a virtual impeller speed, where the virtual impeller speed is the impeller speed that would result if the torque converter bypass clutch was open/slipping and transferring the same amount of torque.
Abstract:
A vehicle includes a motor, a battery, a fuel cell stack, and a controller. The battery is configured to supply power to the motor to propel the vehicle. The fuel cell stack is configured to generate power to charge the battery. The controller is programmed to, while traversing a route with the fuel cell stack not operating and, responsive to data indicative of a predicted distance to empty at an end of the route being greater than a distance threshold, inhibit starting of the fuel cell stack during the traversing.
Abstract:
A hybrid vehicle includes an electric motor and a combustion engine. A K0 clutch couples the combustion engine to a drivetrain of the vehicle. A control module of the vehicle calculates a torque to be applied by the motor to the K0 clutch when initiating engagement of the combustion engine to the drivetrain. The control module calculates two separate torque lead values by two separate methods and calculates the torque by combining the two torque lead values.
Abstract:
A vehicle system for indicating available driving distance includes a display and a controller programmed to store energy consumption data and driving distance data from previous drive cycles. The controller is further programmed to store the previous vehicle drive cycle data according to day of week, and during a current drive cycle, to output via the display an available driving distance. The controller is further configured to generate the available drive distance based on an expected energy consumption rate and an expected driving distance, each corresponding to the day of the week of the current drive cycle.
Abstract:
A fuel cell and battery power management system for a fuel cell-powered vehicle includes an electric traction motor, a traction battery in electrical communication with the electric traction motor, a fuel cell stack in electrical communication with the traction battery and the electric traction motor, and a vehicle control system. The vehicle control system is configured to operate the vehicle with at a first discharge power level and a first charging power level if fuel cell power is sufficient alone to navigate the uphill grade and to build up battery state of charge by charging the traction battery at a second charging power level when the vehicle is approaching an uphill grade if fuel cell power is not sufficient alone to navigate the uphill grade. The vehicle control system is further configured to initiate proactive depletion of the battery SOC to enable powertrain braking and to provide regenerative power.
Abstract:
In at least one embodiment, a vehicle system including a fuel cell stack and a least one controller. The fuel cell stack configured to provide energy for a vehicle. The at least one controller is programmed to control the fuel cell stack to enter into a zero gross power (ZGP) mode responsive to at least the vehicle exhibiting a negative torque demand for a period that is less than a maximum time duration. The at least one controller is further programmed to control the fuel cell stack to enter into a fuel cell shutdown mode responsive to the at least the vehicle exhibiting a negative torque demand for a period that is greater than maximum time duration.
Abstract:
A vehicle includes a transmission and a controller. The transmission has clutches that are configured to establish multiple speed ratios, including a first clutch. The first clutch has a measured drag torque distribution. The measured drag torque distribution has a median and a standard deviation. The controller is programmed to increase a pressure at a rate to engage the first clutch and to increase the rate in response to a measured first clutch torque exceeding the median by a predetermined multiple of the standard deviation.
Abstract:
A hybrid vehicle includes an engine and a motor that are both capable of powering the wheels. While a vehicle is being driven, the vehicle's driving condition data is monitored. The driving condition data can include steering wheel angle or position, accelerator pedal position, driver torque or power demands, or road grade or incline. The vehicle includes a controller with a specific control scheme to receive the driving condition data, and subject the data to a moving average or a weighted moving average. Based on the averaged driving condition data, the engine is inhibited from stopping under certain conditions to reduce the frequency of the engine turning on and off.