Nissan Motor Company Limited

Ikuma Shindo

Tatsuya Suzuki

Naoki Miyashita

Naoteru Kujubu

Yuuki Shiozawa

Mitsunori Ohta

A control method for an electric vehicle controls braking force when the accelerator operation amount is less than a prescribed value and controls drive force when the accelerator operation amount is at least a prescribed value. The electric vehicle control method estimates disturbance torque that acts on the motor as a resistance component relating to gradient; and executes correction whereby the braking force or the drive force is increased/decreased on the basis of the disturbance torque estimated value, such that the resistance component is negated. A determination is made regarding whether or not the accelerator operation amount is a partial equivalent amount and, if at least either the accelerator operation amount on a downhill road is greater than the partial equivalent amount or the accelerator operation amount on an uphill road is less than the partial equivalent amount, the correction amount is reduced.

Control method for electric vehicle and control device for electric vehicle

An electrically driven vehicle includes a motor configured to supply the vehicle with a braking force or a driving force corresponding to an accelerator operation amount. The braking force is controlled when the accelerator operation amount is less than a predetermined value and the driving force is controlled when the accelerator operation amount is the predetermined value or more. A torque target value at which the motor is caused to output a braking or driving torque corresponding to the accelerator operation amount is calculated. A disturbance torque acting on the motor as a resistance corresponding to a road surface gradient is estimated, and a correction to remove the disturbance torque from the torque target value is performed. The correction amount is reduced in a downhill road when the accelerator operation amount is less than the predetermined value and a vehicle speed is larger than a predetermined vehicle speed.

Control method for electrically driven vehicle and control device for electrically driven vehicle

A method for controlling a vehicle that includes a motor configured to provide a driving/braking force to the vehicle and a friction braking mechanism configured to provide a friction brake force to the vehicle includes a target calculation step of calculating a target torque of the motor in accordance with a displacement of an accelerator pedal, a gradient estimation step of estimating a gradient torque to cancel a disturbance due to a gradient of a road surface where the vehicle is travelling, a command calculation step of calculating a torque command value of the motor based on the gradient torque and the target torque, a control step of controlling a torque of the motor in accordance with the torque command value, and a stop control step.

Vehicle control device and control method

The electric vehicle control method is a control method that includes the motor that gives braking force or driving force to a vehicle in accordance with an accelerator operation, by which the braking force is controlled when an accelerator operation amount is smaller than a given value and the driving force is controlled when the accelerator operation amount is the given value or larger. The electric vehicle control device estimates disturbance torque that acts on the motor as resistance component relating to a gradient and executes correction by which the braking force or the driving force is increased or decreased so as to cancel the resistance component in accordance with a disturbance torque estimated value Td. Then, on a downhill road at a given gradient or more, a correction amount of the braking force or the driving force is reduced.

A braking force control method detects a wheel speed of a vehicle, generates a holding braking force for holding the stopped state of the vehicle, regardless of whether or not a brake is operated by a driver of the vehicle, when it is determined that the vehicle has stopped, based on the wheel speed detected in the state in which a braking force is applied to the vehicle, and delays the period in which the holding braking force is generated, in accordance with the friction coefficient of a road surface in the traveling path of the vehicle.

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Kanagawa, Japan

Ikuma Shindo