NOVELTY - The device has a control system provided with an electronic control unit (21). The electronic control unit is utilized for controlling a rotating signal (b) of an organic Rankine cycle working medium pump (8) by receiving a temperature signal (a) of a retarder temperature sensor (1). The electronic control unit controls a control signal (d) of a fuel pump (12) in a fuel reforming unit and a control signal (e) of a reforming gas pump (14) in the fuel reforming unit by receiving a reformer temperature signal (c) of a reformer temperature sensor (11).    USE - Braking heat recycling device for a vehicular eddy current retarder of a diesel engine in a heavy vehicle.    ADVANTAGE - The device utilizes exhaust gas of working medium generated after an expansion machine heats air of a diesel engine so as to improve burning of a diesel engine and reduce pollution. The device can recycle braking heat of a retarder and ensure reliable work of the retarder to improve idling burning and exhausting performance of the diesel engine, thus realizing energy conservation and pollution reduction of the diesel engine by combined action of the organic Rankine cycle generating system, a methanol solution catalyzing and modifying device, an air inlet heating device of the diesel engine and a control system.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for controlling a braking heat recycling device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a braking heat recycling device.    Temperature signal of retarder temperature sensor (a)    Rotating signal of organic Rankine cycle working medium pump (b)    Reformer temperature signal of reformer temperature sensor (c)    Control signal of fuel pump (d)    Control signal of reforming gas pump (e)    Retarder temperature sensor (1)    Organic Rankine cycle working medium pump (8)    Reformer temperature sensor (11)    Fuel pump (12)    Reforming gas pump (14)    Electronic control unit (21)