Vehicle deceleration assist control device

A vehicle deceleration assist control device comprising a driving assist electronic control unit (ECU) for executing a deceleration assist control of a vehicle, wherein

• the driving assist ECU is configured to:
• determine whether a deceleration target is in front of the vehicle;
• calculate, in a case where a determination is made that the deceleration target is in front of the vehicle, a target deceleration value for causing a vehicle speed of the vehicle at a time at which the vehicle reaches a position of the deceleration target to be a target vehicle speed, based on a current vehicle speed of the vehicle, a distance from the vehicle to the deceleration target, and the target vehicle speed determined according to a type of the deceleration target;
• determine whether an accelerator of the vehicle is in an ON state in which an accelerator operation amount exceeds a reference value, or in an OFF state in which the accelerator operation amount is equal to or less than the reference value;
• decelerate the vehicle based on the calculated target deceleration value in a case where a determination is made that the accelerator is in the OFF state;
• in a case where a determination is made that the accelerator is in the ON state,
• (i) decelerate the vehicle according to the accelerator operation amount,
• (ii) set a mode change timing according to the type of the deceleration target, and
• (iii) decelerate the vehicle based on the calculated target deceleration value in a case where the mode change timing is reached;
• and
• in a case where the deceleration target is a preceding vehicle, set the mode change timing earlier in a case where the vehicle is traveling on an uphill road than in a case where the vehicle is traveling on a horizontal road.