A system for braking a vehicle is provided. The system comprises a powertrain comprising an electric machine arranged to propel the vehicle and a transmission arranged to transfer power between the electric machine and the driving wheels of the vehicle. The system further comprises a resistor device arranged to dissipate electric energy generated by the electric machine during braking of the vehicle, and an airflow generating device arranged to generate an airflow over the resistor device. The airflow generating device is arranged to be mechanically driven by the powertrain so as to generate said airflow. By (mechanically) driving the airflow generating device by means of the powertrain, the airflow generating device does not need its own motor, thereby making the system less complex. Further, the driving of the airflow generating device by means of the powertrain will consume energy itself, contributing to braking the vehicle.

A system for braking a vehicle is provided. The system comprises a powertrain comprising an electric machine arranged to propel the vehicle and a transmission arranged to transfer power between the electric machine and the driving wheels of the vehicle. The system further comprises a resistor device arranged to dissipate electric energy generated by the electric machine during braking of the vehicle, and an airflow generating device arranged to generate an airflow over the resistor device. The airflow generating device is arranged to be mechanically driven by the powertrain so as to generate said airflow. By (mechanically) driving the airflow generating device by means of the powertrain, the airflow generating device does not need its own motor, thereby making the system less complex. Further, the driving of the airflow generating device by means of the powertrain will consume energy itself, contributing to braking the vehicle.

The present invention provides a motor-driven traveling device including: a vehicle body; a motor for travel driving that is capable of braking the vehicle body as a short brake or a dynamic brake; an electromagnetic brake that brakes the vehicle body, separately from the motor; an operation switching circuit that switches between causing the motor to perform travel driving and causing the motor to perform braking; a brake release switch that receives an operation pertaining to brake releasing of the motor and the electromagnetic brake; and a brake control circuit that, while the brake release switch is operated, controls the motor and the electromagnetic brake in response to the operation on the brake release switch.

The present invention provides a motor-driven traveling device including: a vehicle body; a motor for travel driving that is capable of braking the vehicle body as a short brake or a dynamic brake; an electromagnetic brake that brakes the vehicle body, separately from the motor; an operation switching circuit that switches between causing the motor to perform travel driving and causing the motor to perform braking; a brake release switch that receives an operation pertaining to brake releasing of the motor and the electromagnetic brake; and a brake control circuit that, while the brake release switch is operated, controls the motor and the electromagnetic brake in response to the operation on the brake release switch.

A vehicle which includes an energy storage device, a rotating electric machine, a recognition unit for recognizing an other vehicle in front, a support unit, and a control unit configured to controlling charge and discharge of the rotating electric machine and the energy storage device according to support control of the support unit. When travelling is performed in accordance with support control, and the support unit predicts or detects that the other vehicle is in a near space closer to the vehicle than a space which satisfies the predetermined positional relationship ahead in a travelling direction of the vehicle based on recognized contents of the recognition unit, the control unit sets a regeneration preparation state where an allowable charging electricity amount, by which the energy storage device can be charged by regenerative electric power generated by the rotating electric machine operating as a generator, is increased.

Various embodiments include method for determining a temperature of an active layer of a heating resistor for a recuperation system of a motor vehicle comprising: determining an instantaneous value of a current flowing through the active layer of the heating resistor at a first time; determining an instantaneous value of a voltage present on the active layer at the first time; calculating an instantaneous value of an electrical resistance based on the determined instantaneous value of the current and the determined instantaneous value of the voltage; and determining an instantaneous value of a temperature of the active layer from the calculated value of the electrical resistance.

Various embodiments include method for determining a temperature of an active layer of a heating resistor for a recuperation system of a motor vehicle comprising: determining an instantaneous value of a current flowing through the active layer of the heating resistor at a first time; determining an instantaneous value of a voltage present on the active layer at the first time; calculating an instantaneous value of an electrical resistance based on the determined instantaneous value of the current and the determined instantaneous value of the voltage; and determining an instantaneous value of a temperature of the active layer from the calculated value of the electrical resistance.

A device is for controlling an electric drive of a trailer vehicle and includes a manual operating unit, which can be arranged in a driver's cab of a towing vehicle, for generating and outputting a request signal for the electric drive in response to a manual selection using the operating unit or a manual input into the operating unit, and a control unit, in particular a brake control unit, of a towing vehicle for receiving the request signal, generating a control signal on the basis of the request signal and outputting the control signal to an electric drive of the trailer vehicle or to a trailer brake control unit of the trailer vehicle. A method is for controlling an electric drive of a trailer vehicle via the device.

An energy conversion device for a vehicle is particularly suited for a rail vehicle. The energy conversion device has, in at least one mode, a unit which operates as a generator unit and has at least one synchronous machine, and which has at least one energy discharge unit which is provided for discharging at least a portion of an electrical energy generated by the generator unit, and has at least one resistor unit. The novel energy discharge unit has at least one control unit which is provided to set operating modes from a set of operating modes in which the resistor unit makes available a different resistance value in each case.

An energy conversion device for a vehicle is particularly suited for a rail vehicle. The energy conversion device has, in at least one mode, a unit which operates as a generator unit and has at least one synchronous machine, and which has at least one energy discharge unit which is provided for discharging at least a portion of an electrical energy generated by the generator unit, and has at least one resistor unit. The novel energy discharge unit has at least one control unit which is provided to set operating modes from a set of operating modes in which the resistor unit makes available a different resistance value in each case.