A system for a vehicle can include a computer having a processor and a memory, the memory storing instructions executable by the processor, including instructions to determine a curvature command for a vehicle based on a feedforward control action based on a road curvature, a feedback control action based on at least one of a path offset or a heading offset of a vehicle with respect to a line defining a target lane; and to operate the vehicle with respect to the line defining the target lane based on the curvature command.

A vehicle includes an engine, and a transmission including a torque converter having an impeller. The vehicle further includes an electric machine configured to provide drive torque to the impeller. The impeller is selectively coupled to the engine via a clutch. At least one vehicle controller is configured to, in response to the engine being OFF, the transmission being in DRIVE, a vehicle speed being zero and a brake pedal being released beyond a threshold position, command the electric machine to provide a torque to the impeller. The torque is a predetermined feedforward torque adjusted by a feedback torque that is based on a difference between measured and calculated speeds. The speeds may be the speeds of the electric machine.

Provided are a driving force control method and device for a hybrid vehicle, each capable of effectively absorbing torque fluctuation of an engine while suppressing deterioration in energy efficiency. The driving force control device for a hybrid vehicle comprises a PCM configured to: identify a vehicle acceleration; estimate an average torque output by an engine; estimate a torque fluctuation component of the torque output by the engine; set a countertorque for suppressing the estimated torque fluctuation component; and control an electric motor to output the set countertorque, wherein the PCM is operable, under a condition that an engine speed and the average torque output by the engine are constant, to set the countertorque such that, as the absolute value of the vehicle acceleration becomes smaller, the absolute value of the countertorque becomes larger.

A system and a method for reducing a rotational imbalance of a drive train of a hybrid vehicle are provided. The drive train includes an internal-combustion engine, an electric machine, and a crankshaft. A reduction or nullification of the rotational imbalance takes place by actuating the electric machine. The actuation is implemented as an adaptive feed forward control, which provides an actuation signal for the electric machine. The actuation signal represents a desired torque to be generated by the electric machine, so that the electric machine outputs a torque that is at least approximately inverse with respect to the rotational imbalance to the crankshaft for the superimposition of the torque generated by the internal-combustion engine.

A hybrid electric vehicle (HEV) includes an internal combustion engine, a traction motor, a generator, and a traction battery. Available electric power in the HEV is based upon the available power in the traction battery. The engine and the motor may both work simultaneously to propel the HEV. While the engine is powering the HEV, a controller is configured to increase a power output of the engine based upon a difference between available battery power and a combination of desired motor power and desired generator power.

A driver of a vehicle applies an actuation force to an accelerator device such as an accelerator pedal or a twist-grip throttle of the vehicle to deflect the accelerator device to an actual deflection angle (φ.sub.act), which is detected. A restoring force acts on the accelerator device opposite the actuation force. An electronic controller determines a nominal deflection angle (φ.sub.nom) to which the accelerator device shall be deflected, based on inputs such as an actual speed of the subject vehicle, a relative speed of the subject vehicle relative to a leading vehicle driving ahead of the subject vehicle, an actual distance of the subject vehicle to the leading vehicle, and a nominal distance at which the subject vehicle shall follow the leading vehicle. The restoring force on the accelerator device is modulated as a function of the difference between the actual deflection angle (φ.sub.act) and the nominal deflection angle (φ.sub.nom).

A vehicle travel control apparatus includes: a sensor that obtains preceding vehicle information representing a status of a preceding vehicle; a communication apparatus that obtains preceding vehicle acceleration/deceleration information, which is generated in the preceding vehicle, via communication with the preceding vehicle; and a controller that generates a first target value related to a target acceleration/deceleration value of a host vehicle based on the preceding vehicle information and a second target value related to the target acceleration/deceleration value of the host vehicle based on the preceding vehicle acceleration/deceleration information, and controls acceleration/deceleration of the host vehicle based on the generated first and second target values, wherein the controller corrects the preceding vehicle acceleration/deceleration information according to a travel scene to generate the second target value.

Provided are a driving force control method and device for a hybrid vehicle, each capable of effectively absorbing torque fluctuation of an engine while suppressing deterioration in energy efficiency. The driving force control device for a hybrid vehicle comprises a PCM configured to: estimate an average torque output by an engine; estimate a torque fluctuation component of the torque output by the engine; set a countertorque for suppressing the estimated torque fluctuation component; and control an electric motor to output the set countertorque, wherein the PCM is operable, under a condition that an engine speed is constant, to set the countertorque such that, as the average torque output by the engine becomes larger, the absolute value of the countertorque becomes larger.

A control method of a hybrid vehicle may include performing a series of commands by a control portion including determining whether an accelerator pedal change amount detected by an accelerator pedal sensor is greater than a predetermined value, starting up an engine through a Hybrid Shaft Generator (HSG) during conversion into an HEV mode from an EV mode, controlling the engine to output constant torque, and synchronizing engine torque with motor torque to engage a clutch.

A method for controlling an auto cruise speed of a vehicle includes: determining a feedback torque for correcting a speed error between a target speed set by a driver of the vehicle and a current speed that is a feedback speed detected by a speed sensor of a vehicle; determining a drive resistance according to the target speed by inputting the target speed; determining a first feedforward torque according to the determined drive resistance; determining a second feedforward torque based on a vehicle inertia and a variation of the target speed by inputting the target speed; and outputting a command for generating a wheel required torque that is corrected by adding the first feedforward torque and the second feedforward torque to the feedback torque.