Enhanced drivability for a hybrid vehicle in cold climate

A method for running a diesel hybrid electric vehicle in electric mode in cold weather, wherein the vehicle comprises a control unit connected to an ambient temperature sensor, to a fuel temperature sensor, and to a velocity sensor of the vehicle, the method comprising:

• measuring an ambient temperature;
• retrieving information from the control unit on a cold filter plugging point temperature of fuel in the vehicle;
• measuring a temperature of diesel fuel;
• measuring a velocity of the vehicle;
• calculating a temperature in a fuel filter;
• starting the internal combustion engine if the calculated temperature in the fuel filter is 4 to 6 degrees or more below the cold filter plugging point temperature;
• and
• switching off the internal combustion engine when the calculated temperature in the fuel filter has increased to the cold filter plugging point temperature.

A method for running a diesel hybrid electric vehicle in electric mode in cold weather, the method comprising:

• measuring an ambient temperature;
• measuring a temperature of diesel fuel;
• measuring a velocity of the vehicle;
• determining a temperature in a fuel filter based on the measured ambient temperature, the measured diesel fuel temperature, and the measured velocity;
• starting the internal combustion engine if the temperature in the fuel filter is 4 to 6 degrees or more below a cold filter plugging point temperature of fuel in the vehicle;
• and
• switching off the internal combustion engine when the temperature in the fuel filter has increased to the cold filter plugging point temperature.