POWER MANAGEMENT SYSTEM FOR A TRANSPORT REFRIGERATION UNIT

A vehicle for transporting goods, a tractor-trailer system for transporting goods, and a method of operating a power management system for powering a transport refrigeration unit are described. [0002] The vehicle 1 for transporting goods comprises: an axle 10; a transport refrigeration unit 3; and a power management system 2 for supplying power to the transport refrigeration unit 3. The power management system 2 comprises: a generator 11 configured to be selectively coupled to an axle 10 of the vehicle 1, wherein the generator 11 is configured to generate electricity when coupled to the axle 10; and a controller 20 configured to monitor a speed of the vehicle 1 and to selectively couple and decouple the generator 11 from the axle 10. The controller 20 is configured to determine that the vehicle 1 is in a first state and decouple the generator 11 from the axle 10 when the vehicle 1 is in the first state, wherein the speed of the vehicle 1 is increasing in the first state. The controller 20 is configured to determine that the vehicle 1 is in a second state and couple the generator 11 to the axle 10 when the vehicle 1 is in the second state, wherein the speed of the vehicle 1 is substantially constant in the second state.