Apparatus and method for controlling transmission of vehicle and vehicle system

A method of controlling a transmission of a vehicle, the method comprising:

• determining, by a control device, whether to perform deceleration control, based on the vehicle and a target for the deceleration control in front of the vehicle, upon determining that coasting of the vehicle is started;
• sub-dividing, by the control device, a distance between a current position of the vehicle and the target for the deceleration control into a plurality of sections, and determining a target distance for each section of the plurality of sections and a target speed of each section, according to a current speed of the vehicle and the distance between the current position of the vehicle and the target for the deceleration control, when the deceleration control is determined to be performed;
• determining, by the control device, a gearshifting stage for each section of the plurality of sections, according to the determined target speed for each section and the determined target distance for each section by configuring a deceleration profile for each gearshifting stage;
• and
• controlling, by the control device, the transmission for each section of the plurality of sections according to the gearshifting stage for each section.

A vehicle system comprising:

• a navigation system configured to provide information on a road;
• and
• a vehicle transmission controlling apparatus of a vehicle and of being configured to:
• sub-divide a distance between a current position of the vehicle and a target for a deceleration control into a plurality of sections, upon determining that the target for the deceleration control is confirmed as being present on a front road by the navigation system,
• determine a target distance for each section of the plurality of sections and a target speed for each section of the plurality of sections according to a current speed of the vehicle and the distance between the current position of the vehicle and the target for the deceleration control,
• determine a gearshifting stage for each section of the plurality of sections, according to the determined target speed for each section of the plurality of sections and the determined target distance for each section of the plurality of sections by configuring a deceleration profile for each gearshifting stage, and
• control a transmission of the vehicle according to the determined gearshifting stage.