Gm Global Technolgoy Operations, Inc.

Adam J Heisel

Christopher E Whitney

Nathaniel S Michaluk

Krunal P Patel

Paul G Otanez

Robert L Morris

Sean W McGrogan

Yiran Hu

Jacob M Knueven

Love Lor

Anthony H Heap

Goro Tamai

Lawrence A Kaminsky

William Leonard Aldrich, Iii

Robert Charles Simon, Jr

Lan Wang

Matthew D Whitton

Ning Jin

Keith D Van Maanen

Birendra P Bhattarai

Craig J Hawkins

John L Lahti

Shaochun Ye

Todd P Lindemann

Kevin J Storch

Michael Glenn Diaz

Jun Lu

Christopher J Twarog

Douglas J Moening

Michael D Haggerty

Michael Arnett

Roger Joseph Rademacher

Daniel Lee Baibak

Matthew Yard

Jeffrey J Waldner

Robert C Gibson

Trista K Schieffer

John Corn

Brian Kalinowski

Nicholas Michael Cococcetta

Derek S Bonderczuk

A vehicle includes a system that performs a method of operating the vehicle. The system includes a road grade sensor for measuring a road grade of a road section being traversed by the vehicle, a speedometer for measuring a vehicle speed, a power flow direction sensor for obtaining a power flow direction of the vehicle, a pedal position sensor for measuring a pedal position, and a processor. The processor is configured to determine an axle torque upper limit for a motor of the vehicle based on the road grade, the vehicle speed and the power flow direction, determine an axle torque request based on the vehicle speed and the pedal position, determine a clipped axle torque request from the axle torque request and the axle torque upper limit, and control the vehicle by implementing the clipped axle torque request at the vehicle.

Axle torque grade assist

A method of operating a vehicle includes a vehicle controller receiving an operator-input vehicle control command with an associated torque request, and identifying any propulsion actuator constraints that limit a brake torque capacity available from the vehicle powertrain. Using the propulsion actuator constraint(s) and torque request, the controller determines a propulsion brake torque distribution for the vehicle's road wheels and a maximum brake torque capacity for the powertrain actuator(s). A first brake torque request is determined using the propulsion brake torque distribution and a vehicle control mode of the powertrain system, and a second brake torque request is determined using the maximum brake torque capacity and the vehicle control mode. A friction brake torque command is determined by arbitrating between the first and second brake torque requests. The vehicle controller transmits the friction brake torque command to the friction brake system and a powertrain brake command to the powertrain actuator(s).

Intelligent vehicles and control logic for brake torque request estimation for cooperative brake system control

A method of operating a vehicle includes a vehicle controller receiving a driver acceleration/deceleration command for the vehicle's powertrain and determining a torque request corresponding to the driver's acceleration command. The controller shapes the torque request and determines compensated and uncompensated accelerations from the shaped torque request. The compensated acceleration is based on an estimated road grade and an estimated vehicle mass, whereas the uncompensated acceleration is based on a zero road grade and a nominal vehicle mass. A final speed horizon profile is calculated as: a speed-control speed profile based on the uncompensated acceleration if the vehicle's speed is below a preset low vehicle speed; or a torque-control speed profile based on a blend of the compensated and uncompensated accelerations if the vehicle speed exceeds the preset low vehicle speed. The controller commands the powertrain to output a requested axle torque based on the final speed horizon profile.

Intelligent motor vehicles and control logic for speed horizon generation and transition for one-pedal driving

Presented herein are adaptive power assist systems for manually-powered vehicles, methods for operating such systems, and motor-assisted, operator-powered vehicles equipped with such systems. A method for regulating a power assist system includes a vehicle controller receiving torque sensor data indicative of user-generated torque input. The vehicle controller then determines: if the torque input is less than a commanded motor torque generated by a tractive motor; and, if a calibrated motor decay time of the tractive motor is less than a scaled cadence time of the user's cadence speed. Responsive to both determinations being positive, the vehicle controller calculates a torque decay factor based on the current cadence speed, and modifies the commanded motor torque based on this calculated torque decay factor. The vehicle controller then transmits command signals to the tractive motor to output a modulated motor torque according to the modified commanded motor torque.

Adaptive pedal assist systems and control logic with input torque filters for intelligent e-bikes

Vehicles, systems, and methods for determining a distance travelled are provided. In an exemplary embodiment, a vehicle includes an electric motor with a motor rotor shaft. A motor resolver is positioned adjacent to the motor rotor shaft, where the motor resolver is configured to determine a motor position of the electric motor based on revolutions of the motor rotor shaft. A controller is in communication with the motor resolver, where the controller is configured to determine a distance travelled from a change in the electric motor position.

Devices and methods for determining a distance travelled

A road load module is configured to determine a road load torque to maintain zero vehicle acceleration. A closed loop (CL) module is configured to determine a CL torque based on a difference between a target vehicle speed and a vehicle speed. A motor torque module is configured to: produce a limited CL torque by limiting the CL torque to a predetermined torque limit when a magnitude of the CL torque is greater than a magnitude of the predetermined torque limit; when the vehicle speed is within a predetermined low speed range and a magnitude of the road load torque is greater than or less than a magnitude of a predetermined maximum torque, adjust the predetermined torque limit; and determine a motor torque command based on the limited CL torque and a motor torque request determined based on a position of an accelerator pedal.

Control systems and methods for preventing low vehicle speed

A road load module is configured to determine a road load torque to maintain zero vehicle acceleration. An initialization module is configured to determine an initial torque based on the road load torque. A closed loop (CL) module is configured to: when a CL state transitions from an inactive state to an active state, set a CL torque to the initial torque; and when the CL state is in the active state after transitioning to the active state, adjust the CL torque based on a difference between a target vehicle speed and a vehicle speed. A motor torque module is configured to determine a motor torque command based on the CL torque and a motor torque request determined based on an accelerator pedal position. A switching control module is configured to, based on the motor torque command, control switching of an inverter and apply power to an electric motor.

Initialization of closed loop control for vehicle stopping

An electric motor control system for a vehicle includes a vehicle speed module that determines a vehicle speed. A target speed module selectively transitions a target vehicle speed to zero over a period in response a driver actuating an input device. The input device is not an accelerator pedal or a brake pedal. A switching control module, based on a difference between a target vehicle speed and the vehicle speed, controls switching of an inverter to control application of power to an electric motor of the vehicle.

Vehicle speed control systems and methods

An electric motor control system for a vehicle includes a vehicle speed module that determines a vehicle speed. A closed loop (CL) module determines a CL torque based on a difference between a target vehicle speed and the vehicle speed. A motor torque module determines a motor torque based on the CL torque and a motor torque request determined based on a position of an accelerator pedal. A switching control module controls switching of an inverter based on the motor torque to control application of power to an electric motor of the vehicle.

A method for operating a powertrain system of a vehicle includes determining an initial creep torque command in an operator-selected direction of travel, adjusting the initial creep torque command responsive to an operator braking request and responsive to a change in direction of vehicle speed relative to the operator-selected direction of travel, and operating the hybrid powertrain to generate axle torque in response to the adjusted creep torque command.

Method and apparatus for controlling creep torque in a hybrid powertrain system

A method of executing a downshift in a fixed-gear powertrain having an input node and an output node related by a starting speed ratio before the downshift and a finishing speed ratio after is provided. The downshift includes a torque phase and an inertia phase. A starting output torque is calculated as a function of a starting driver request. An electric machine applies a starting regenerative input torque which is calculated as substantially equal to the starting output torque divided by the starting speed ratio. A finishing output torque is calculated as a function of a finishing driver request. The electric machine applies a finishing regenerative input torque which is calculated as substantially equal to the finishing output torque divided by the finishing speed ratio.

Negative-torque downshift execution for fixed-gear transmissions

A method for operating a powertrain system including a torque machine coupled to an internal combustion engine that is coupled to a transmission includes, upon commanding a shift in a transmission operating range, activating an immediate response mode to effect the shift. Activating the immediate response mode includes controlling the engine to achieve a predicted engine torque command, and controlling motor torque of the torque machine in response to a difference between an actual engine torque and an immediate crankshaft torque for shift command. An arbitrated predicted motor torque is determined. A possible crankshaft torque is determined in response to the arbitrated predicted motor torque and the predicted engine torque command. Operation of the transmission at the end of the shift event is commanded in response to the possible crankshaft torque. A predicted response mode is activated to complete the shift in the transmission operating range.

Method and apparatus for executing a transmission shift in a powertrain system including a torque machine and an engine

A method for controlling output torque of a hybrid powertrain system includes determining a constrained output torque in response to an operator torque request, and determining maximum and minimum output torque limits. A time-rate change in the constrained output torque at each of a plurality of torque breakpoints is determined. A desired output torque is determined. A preferred output torque is determined as the desired output torque adjusted using the time-rate changes in the constrained output torque at the plurality of torque breakpoints and limited within the maximum and minimum output torque limits. Torque outputs of torque generators of the hybrid powertrain system are controlled in response to the preferred output torque.

Method for controlling torque output of a hybrid powertrain system

A minimum torque module selectively determines a first minimum propulsion torque based on second and third minimum propulsion torques when a torque converter clutch is in unlocked and locked states, respectively. A zero pedal torque module selectively sets a zero pedal torque equal to the first minimum propulsion torque. A pedal request module determines a pedal torque request based on an accelerator pedal position, a vehicle speed, and the zero pedal torque. A driver request module determines a driver axle torque request based on the pedal torque request. A shaping module selectively shapes the driver axle torque request into a shaped driver axle torque request. A conversion module converts the first minimum propulsion torque into a minimum axle torque. A final driver request module sets a final driver axle torque request equal to a greater of the shaped driver axle torque request and the minimum axle torque.

Driver torque request systems and methods

A powertrain system includes an electric machine mechanically coupled to an internal combustion engine mechanically coupled to a transmission. A method for operating the powertrain system includes determining an engine stall threshold rate during engine operation in a low load condition. A time-rate change in an accessory load is controlled by the electric machine operating in an electric power generating mode in response to the engine stall threshold rate during the engine operation in the low load condition.

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Garden City, MI, United States of America

Adam J Heisel