A method of decreasing vibration during release of a stop gear of a vehicle can be applied to an eco-friendly vehicle for decreasing vibration generated when a driver releases a P step of a gear lever while torsion occurs in a drive shaft of the vehicle. Reaction force torque of a driving motor is controlled so as to output reaction force that has been generated in a parking sprag by a driving motor when torsion occurs in the drive shaft after entrance of the gear lever into the P step, so as to decrease vibration generated because torsion reaction force of the drive shaft vanishes at the same time.

The present disclosure provides a method for learning a kisspoint of an engine clutch in a hybrid vehicle, which performs kisspoint learning of an engine clutch while driving by learning hydraulic pressure at the time when motor torque varies by gradually increasing clutch hydraulic pressure in an open state of the engine clutch when a driving load of a vehicle is constant to increase a kisspoint learning frequency of the engine clutch and improve kisspoint accuracy.

A dual-motor electric vehicle (EV) drive system is provided that employs two different types of electric motors; at least one permanent magnet synchronous motor and at least one induction asynchronous motor. Under most low demand driving applications the EV relies on the permanent magnet motor(s), thus benefiting from the operating efficiency of this type of motor. Under high demand driving applications, for example during strong acceleration and high speed cruising, the EV is able to benefit from the output power capabilities of the induction motor(s).

A driving system includes an engine an engine, a motor generator, a gear mechanism, and a controller. The gear mechanism couples the engine and the motor generator to each other. The gear mechanism includes first and second gears. The first and second gears are configured to be supplied with first driving torque from the engine and second driving torque from the motor generator, respectively. The second gear meshes with the first gear. The controller is configured to perform torque control of the engine to make a rate of variation in the first driving torque at the first gear at a time when the following conditional expression (1) is satisfied smaller than that at a time when the following conditional expression (1) is not satisfied.
|T2−T1|<Th1  (1) T1 is the first driving torque, T2 is the second driving torque, and Th1 is a first threshold.

A driving mode control method and apparatus of a hybrid electric vehicle are provided. The driving mode control method includes decreasing a torque of an engine when a first driving mode in which both the engine and a first motor are driven is switched to a second driving mode driven by the first motor and applying a torque of a second motor. A clutch is then opened when a difference between the engine torque and the second motor torque is less than a first threshold torque.

A method of controlling gear shifting of a hybrid vehicle including an engine, a motor, and a stepped transmission includes predicting a requested torque reduction amount requested by the engine and the motor when there is a request to shift gears of the transmission, determining whether to realize the predicted requested torque reduction amount by reducing motor torque or applying counter torque, as a result of the determining, when it is not possible to realize the predicted requested torque reduction amount, determining an operating point correction amount for increasing an available torque reduction amount of the motor, and determining whether to perform first gear-shifting control in consideration of efficiency of the first gear-shifting control of increasing the motor torque and reducing engine torque by the operating point correction amount before an actual requested torque reduction amount is input.

A control apparatus for a vehicle that includes an engine, an electric motor, a clutch for separating connection between the engine and the electric motor, and a fluid-type transmission device including a lockup clutch and transmitting drive powers of the engine and the electric motor to drive wheels. The control apparatus includes (a) a portion configured, during motor running of the vehicle with the clutch being released, to calculate a predicted value of a rotational speed of the electric motor, depending on an operation state of the lockup clutch; (b) a portion configured to calculate a predicted value of an outputtable maximum torque of the electric motor, by using the predicted value of the rotational speed of the electric motor; (c) a portion configured to determine whether start of the engine is requested or not, by using the predicted value of the outputtable maximum torque of the electric motor.

Systems and methods for operating a vehicle in an electric idle mode are presented. The vehicle electrical idle mode may be characterized as a mode where the vehicle's engine is off; the vehicle increases torque to vehicle wheels responsive to an application of an accelerator pedal, release of a brake pedal, or a vehicle occupant shifting a transmission; and the vehicle's battery supplies electrical energy to devices of the vehicle being operated by a vehicle occupant.

A driving control mechanism includes: a motor that is coupled to a driving wheel; a transmission that is coupled to the driving wheel; and an internal combustion engine that is coupled to an input shaft of the transmission. In a first state in which a driving force of the motor is transmitted to the driving wheel and a driving force of the internal combustion engine is not transmitted to the driving wheel, the transmission reduces a transmission gear ratio to a value less than a target transmission gear ratio according to a requested driving force when a transition request to a second state in which driving forces of the motor and the internal combustion engine are transmitted to the driving wheel is issued. The motor increases a driving force to be transmitted to the driving wheel when the transition request is issued.

A vehicle includes a rotary electric machine, an internal combustion engine, a temperature sensor, and a limiter. The rotary electric machine generates power to move the vehicle. The internal combustion engine is started by the rotary electric machine to generate power to move the vehicle. The temperature sensor detects temperature of the rotary electric machine or of a drive circuit for the rotary electric machine. The limiter restricts the power generated by the rotary electric machine if the temperature is higher than a first threshold temperature. The start prohibitor prohibits the rotary electric machine from starting the internal combustion engine if the temperature is higher than a second threshold temperature which is higher than the first threshold temperature.