A vehicle control system determines an upper non-zero limit on deceleration of a vehicle to prevent rollback of the vehicle down a grade being traveled up on by the vehicle. The upper non-zero limit on deceleration is determined by the controller based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle. The controller is configured to monitor the deceleration of the vehicle, and to automatically prevent the deceleration of the vehicle from exceeding the upper non-zero limit by controlling one or more of a brake or a motor of the vehicle. The controller also is configured to one or more of actuate the brake or supply current to the motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed.

This disclosure generally relates to an electric vehicle. More specifically, this disclosure describes a motor control system for an electric vehicle that activates and deactivates a hill hold assist mode and a hill start assist mode for the electric vehicle. The hill hold assist mode is used to help ensure the electric vehicle remains stationary while stopped on an uphill incline. Likewise, the hill start assist mode is used to help a rider of the electric vehicle start the electric vehicle moving again once it is stopped on the uphill slope.

A vehicle control device including: a road gradient acquisition unit configured to acquire a road gradient of a road on which a vehicle is currently traveling; a travel section determination unit configured to determine a forward travel section that is a travel section having a different road gradient from a current travel section in which the vehicle is currently traveling and that is ahead in a travel direction of the vehicle; and a horsepower limitation unit configured to limit an output horsepower of an engine based on a travel resistance of the vehicle, in which the horsepower limitation unit is configured to release the output horsepower limitation of the engine in a case where the travel resistance in the forward travel section is greater than the travel resistance of the vehicle in the current travel section.

A fuel cell system mounted on a vehicle includes a drive motor generating a driving force and regenerative power; an auxiliary machine consuming the regenerative power; and a controller. The controller determines that the vehicle is in a first state when the vehicle has a negative vehicle speed, a move forward request is given to the vehicle and an accelerator pedal is depressed or when the vehicle has a positive vehicle speed, the move backward request is given to the vehicle and the accelerator pedal is depressed. When a predetermined first condition including a condition that the vehicle is in the first state is satisfied, the controller performs an auxiliary machine consumption process that causes the auxiliary machine to consume the regenerative power that includes a required power for the drive motor calculated by using a depression amount of the accelerator pedal.

An electric drive system includes an energy storage system (ESS), a power conversion system, and an alternating current (AC) traction system. The ESS provides or receives electric power. The ESS includes a first energy storage unit and a second energy storage unit. The power conversion system is electrically coupled to the ESS for converting an input power to an output power. The AC traction system is electrically coupled to the power conversion system for converting the output power of the power conversion system to mechanical torques. The AC traction system includes a first AC drive device and a second AC drive device. An energy management system (EMS) is in electrical communication with the ESS, the AC traction system, and the power conversion system for providing control signals.

A control device for a transport vehicle configured to travel with a driving force output from an electric motor is provided. When the transport vehicle is driven by a driving force of the electric motor and a variation rate is equal to or less than a predetermined value while a parameter relating to a traveling speed of the transport vehicle is less than a first predetermined value, the control device sets a threshold value, at which an output limit of the electric motor is started based on a parameter relating to a temperature of the electric motor or a temperature of an electric device for driving the electric motor, to a variable value corresponding to a required driving force to the transport.

A motorized movement device includes a frame, first and second wheels connected to the frame, and first and second motors connected respectively to the first and second wheels that are commandable by respective command signals. The motorized device also includes an inertial measuring unit configured to detect the longitudinal acceleration, pitch angular speed, and yaw angular speed of the movement device and for providing signals representative of the same. The motorized device also includes sensors for detecting speeds of the wheels and configured to provide signals representative thereof. The motorized device further includes a control unit comprising a module for estimating the slope, and longitudinal thrust exerted by a user to the device, yaw torque applied by the user. The control unit also includes a module for compensating the slope, a thrust amplifying module, a yaw torque amplifying module, and a torque allocating module.

A control method and system for preventing a vehicle from rolling backwards down a slope and a vehicle including a system are provided. The control method includes sensing the number of revolutions per minute (RPM) of a motor connected to a driving shaft of the vehicle and comparing the sensed RPM of the motor with a preset RPM to determine whether the vehicle begins to roll backwards. In response to determining that the vehicle begins to roll backwards, driving torque is applied to the motor to prevent the vehicle from rolling backwards.

A vehicle control system determines an upper non-zero limit on deceleration of a vehicle to prevent rollback of the vehicle down a grade being traveled up on by the vehicle. The upper non-zero limit on deceleration is determined by the controller based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle. The controller is configured to monitor the deceleration of the vehicle, and to automatically prevent the deceleration of the vehicle from exceeding the upper non-zero limit by controlling one or more of a brake or a motor of the vehicle. The controller also is configured to one or more of actuate the brake or supply current to the motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed.

A control device and a transmission system are configured to improve riding comfort of a human-powered vehicle. The control device includes an electronic controller that is configured to control a transmission device of a human-powered vehicle so that a transmission ratio at which the vehicle is started becomes equal to a designated transmission ratio. The electronic controller is configured to set the designated transmission ratio based on reference information that excludes information related to a gradient of a road surface, information related to manual operation of the transmission device, and information related to propulsion assistance of the human-powered vehicle.