Hybrid electric vehicle and a shift control method for same

A shift control method of a hybrid electric vehicle, the method comprising:

• determining a speed control torque based on a result of comparing a speed of an input end of a transmission with a target speed of the input end of the transmission according to a shift signal;
• determining an order of distributing the speed control torque to each of a first motor connected directly to an engine and a second motor connected directly to the input end of the transmission based on whether an engine clutch is locked up;
• distributing the speed control torque to a priority motor of the first motor and the second motor;
• and
• distributing a residual speed control torque to a subordinate motor of the first motor and the second motor when the speed control torque is greater than a charging limit torque of the priority motor.

A hybrid electric vehicle comprising:

• an engine;
• a first motor connected directly to the engine;
• an engine clutch connected directly to the first motor;
• a second motor selectively connected to the first motor through the engine clutch;
• a transmission having an input end connected directly to the second motor;
• a first controller configured to determine whether the transmission is required to be shifted;
• and
• a second controller configured to determine a speed control torque based on a result of comparing a speed of the input end of the transmission with a target speed of the input end of the transmission when receiving a shift signal from the first controller, configured to distribute the speed control torque to the second motor and configured to distribute a residual speed control torque to the first motor based on whether the engine clutch is locked up when the speed control torque is greater than a charging limit torque of the second motor.