Disclosed are a vehicle and an engine control method for more conveniently restarting an engine in the state in which a function of automatically turning off the engine is activated during braking for improving fuel efficiency. The engine control method includes turning off an engine through an idle stop and go (ISG) system during braking due to manipulation of a brake pedal, determining whether at least one preset starting condition is satisfied based on information on a forward environment, and turning on the engine irrespective of whether manipulation of the brake pedal is released when any one of the at least one starting condition is satisfied.

A hybrid electric vehicle and method of its control include a parallel hybrid powertrain including an engine, a transmission, a battery system, a first electric motor coupled to the engine by a first clutch between the engine and the first electric motor, a second electric motor coupled to the transmission and to the first electric motor by a second clutch between the first and second electric motors, and a controller configured to control the parallel hybrid powertrain for optimal operation across a plurality of different propulsion and charging modes, including calculating cost values for each of the engine and the first and second electric motors and selecting optimal propulsion and charging modes based on the calculated cost values.

A method for starting off a motor vehicle, wherein the motor vehicle has a drive train, which comprises a hybrid drive unit, a transmission and an accelerator pedal, by means of which a driver can set a driver's desired torque, wherein during the starting off of the motor vehicle the hybrid drive unit is regulated to a total drive torque greater than the driver's desired torque in a first operating phase.

Systems and methods are provided for controlling a transmission. An engine stop-start event may be allowed or denied based on one or more characteristics of the vehicle including the transmission.

Methods and systems are provided for operating a hybrid vehicle during launch conditions from rest. In one example, a driver demand torque is held constant until a threshold vehicle speed is reached when a constant accelerator pedal position is present so that closing of a transmission input clutch may result in reduced driveline torque disturbances while a desired driver demand torque is delivered.

The powertrain device for a vehicle includes an engine and an automatic transmission, the automatic transmission includes a plurality of friction fastening elements for selectively switching motive power transmitting paths, a predetermined friction fastening element among the plurality of friction fastening elements is a travel-start friction fastening element performing slip control in a travel start, and the powertrain device includes, between the engine and the automatic transmission, a motive power connection-disconnection clutch which is released at least in an engine start and is fastened earlier than the travel-start friction fastening element in a travel start of the vehicle.

A motor torque control method for a motor-driven vehicle is carried out when a vehicle reduces its speed to a low speed or is in a stopped state, gear backlash and torsion of a drivetrain are minimized, and thus impact on the drivetrain which may occur during starting or restarting of a vehicle is minimized. The motor control method includes determining whether vehicle speed is in a speed reducing state less than a set vehicle speed or in a stopped state; determining a required torque command, an anti-jerk torque, and an additional drivetrain arrangement torque for removing drivetrain backlash based on vehicle operation state information when the speed reducing state or the stopped state is determined; and determining a motor torque command by using the required torque command, the anti-jerk torque, and the drivetrain arrangement torque.

A vehicle travel control system for a vehicle may include: a launch profile generator to generate a target torque profile or a target speed profile based on monitored driving information of a host vehicle and a target vehicle; and a controller to control a speed or an acceleration of the host vehicle based on the generated profile. In particular, the launch profile generator analyzes an intention of a driver of the host vehicle when the driver intervenes at least one of the speed, acceleration or deceleration of the host vehicle being controlled, and the launch profile generator further revises the target torque profile or the target speed profile when the analyzed intention represents preferences of the driver such that the controller controls the host vehicle based on the revised profile.

An orientation control device serving as a control device includes: an orientation control unit configured to, in a case where a vehicle is stopped on a slope road by applying braking force to a front wheel and a rear wheel, instruct a braking device to decrease front wheel braking force and rear wheel braking force and execute orientation control for instructing a drive device to increase drive force of the vehicle in a range in which a stop state of the vehicle is maintained; and a braking increase instruction unit configured to execute braking increase control for instructing the braking device to increase the braking force of at least one of the front wheel and the rear wheel after the increase in the drive force of the vehicle in accordance with the execution of the orientation control is ended.

A vehicle control apparatus includes: a clutch controller configured to switch an operation state of a clutch mechanism from a release state to an engagement state upon switching of a traveling mode from a motor traveling mode to an engine traveling mode; and a motor controller configured to control a traveling motor to suppress variation in torque upon starting of the engine. The clutch controller is configured to control the clutch mechanism to be brought into the engagement state at a first engaging speed when the engine is started on a condition that a revolution speed of the motor driving system is higher than a revolution threshold, and to control the clutch mechanism to be brought into the engagement state at a second engaging speed lower than the first engaging speed when the engine is started on a condition that the revolution speed is lower than the revolution threshold.