Driving support apparatus for vehicle

1. A driving support apparatus for a vehicle, comprising:

a constant speed cruise target acceleration calculating unit configured to calculate a constant speed cruise target acceleration for bringing a subject vehicle speed closer to a set vehicle speed set by a driver;

a preceding vehicle recognizing unit configured to recognize a preceding vehicle;

a follow-up cruise target acceleration calculating unit configured to calculate a follow-up cruise target acceleration for a follow-up cruise following a preceding vehicle when the preceding vehicle is recognized by the preceding vehicle recognizing unit;

an acceleration/deceleration controlling unit configured to control an acceleration/deceleration of the subject vehicle by selectively using the constant speed cruise target acceleration or the follow-up cruise target acceleration;

a stop signal recognizing unit configured to recognize a traffic signal displaying an instruction to stop to the subject vehicle; and

a traffic signal target acceleration calculating unit configured to calculate a traffic signal target acceleration for stopping the subject vehicle at a stop position of a stop signal when the stop signal is recognized by the stop signal recognizing unit,

wherein the follow-up cruise target acceleration calculating unit substitutes a value of the traffic signal target acceleration for the follow-up cruise target acceleration when the follow-up cruise target acceleration is not calculated and the traffic signal target acceleration is calculated, and substitutes the value of the traffic signal target acceleration for the follow-up cruise target acceleration when the follow-up cruise target acceleration and the traffic signal target acceleration are calculated and the traffic signal target acceleration is smaller than the follow-up cruise target acceleration, and wherein, when the proceeding vehicle will not stop before the stop signal, the subject vehicle can be controlled to be decelerated toward the stop signal without being affected by the proceeding vehicle.

2. The driving support apparatus for a vehicle according to claim 1 , wherein, when the preceding vehicle and the stop signal are recognized and it is determined that the preceding vehicle has traveled past the stop position of the stop signal, the follow-up cruise target acceleration calculating unit excludes the preceding vehicle from a target object.

3. The driving support apparatus for a vehicle according to claim 2 , wherein, when an inter-vehicle distance to the preceding vehicle is longer than a distance to the stop position of the stop signal, the follow-up cruise target acceleration calculating unit determines that the preceding vehicle has traveled past the stop position of the stop signal.

4. The driving support apparatus for a vehicle according to claim 3 , wherein, when the preceding vehicle and the stop signal are recognized and it is determined that the preceding vehicle is likely to travel past the stop signal, the follow-up cruise target acceleration calculating unit excludes the preceding vehicle from a target object.

5. The driving support apparatus for a vehicle according to claim 4 , wherein the follow-up cruise target acceleration calculating unit calculates a time required for the preceding vehicle to travel past the stop position of the stop signal when the preceding vehicle travels at a current vehicle speed, and determines that the preceding vehicle is likely to travel past the stop signal when the required time is equal to or less than a preset value and a deceleration of the preceding vehicle is equal to or less than a preset value.

6. The driving support apparatus for a vehicle according to claim 2 , wherein, when the preceding vehicle and the stop signal are recognized and it is determined that the preceding vehicle is likely to travel past the stop signal, the follow-up cruise target acceleration calculating unit excludes the preceding vehicle from a target object.

7. The driving support apparatus for a vehicle according to claim 6 , wherein the follow-up cruise target acceleration calculating unit calculates a time required for the preceding vehicle to travel past the stop position of the stop signal when the preceding vehicle travels at a current vehicle speed, and determines that the preceding vehicle is likely to travel past the stop signal when the required time is qual to or less than a preset value and a deceleration of the preceding vehicle is equal to or less than a preset value.

8. The driving support apparatus for a vehicle according to claim 1 , wherein when the preceding vehicle and the stop signal are recognized and it is determined that the preceding vehicle is likely to travel past the stop signal, the follow-up cruise target acceleration calculating unit excludes the preceding vehicle from a target object.

9. The driving support apparatus for a vehicle according to claim 8 , wherein the follow-up cruise target acceleration calculating unit calculates a time required for the preceding vehicle to travel past the stop position of the stop signal when the preceding vehicle travels at a current vehicle speed, and determines that the preceding vehicle is likely to travel past the stop signal when the required time is equal to or less than a preset value and a deceleration of the preceding vehicle is equal to or less than a preset value.

10. The driving support apparatus for a vehicle according to claim 1 , further comprising a standby cruise target acceleration calculating unit configured to calculate a standby cruise target acceleration for making the subject vehicle travel at a very low preset speed when the traffic signal target acceleration is used as the follow-up cruise target acceleration and when the subject vehicle speed is a low speed lower than a preset vehicle speed or a distance to the stop position of the stop signal is shorter than a preset distance,

wherein the acceleration/deceleration controlling unit controls acceleration/deceleration of the subject vehicle by using the standby cruise target acceleration when the standby cruise target acceleration is calculated.

11. The driving support apparatus for a vehicle according to claim 1 , further comprising a display unit configured, when an acceleration/deceleration control using the follow-up cruise target acceleration is performed, to display whether the acceleration/deceleration control is using the preceding vehicle or the stop signal as the target object.

12. The driving support apparatus for a vehicle according to claim 11 , wherein the display unit is further configured to display the preceding vehicle.

13. The driving support apparatus for a vehicle according to claim 1 , wherein the constant speed cruise target acceleration calculating unit sets an inter-vehicle distance mode for setting a follow-up target distance.