Control system and method for an electric vehicle

A control system, comprising one or more controllers, for an electric vehicle, the control system comprising:

• an input arranged to receive a temperature signal indicative of a temperature of a transmission associated with a traction electric machine of the vehicle;
• an output arranged to output a flow control signal for controlling one or more valves and/or pumps to control a flow of lubricant fluid associated with the traction electric machine and the transmission through a heat exchanger, the flow control signal being indicative of a proportion of the flow of lubricant fluid through the heat exchanger and at least one bypass fluid path, respectively, the at least one bypass fluid path comprising one or more conduits allowing a circulation of the lubricant fluid between the traction electric machine and the transmission bypassing the heat exchanger;
• and
• an electronic processing device arranged to (i) control the output to output the flow control signal in dependence on the temperature signal and (ii) determine the proportion of the flow of lubricant through the heat exchanger and the at least one bypass fluid path in dependence on the temperature signal.