Proximity warning system for parked vehicles

1. A proximity alert system for a vehicle having a mobility access device that is moveable between a stowed position and a deployed position, said proximity alert system comprising:

a control system;

a sensor system operatively associated with said control system, said sensor system being operable to detect a presence of an object within a defined sensing region exterior to the vehicle, the defined sensing region encompassing a region occupied by the mobility access device when the mobility access device is in the deployed position; and

an annunciator system operatively associated with said control system, said annunciator system being operable to provide an indication discernable to a person outside the vehicle and associated with the object that the object has been detected within the defined sensing region, said control system operating said sensor system when the mobility access device is in the stowed position, said control system operating said annunciator system when said sensor system detects the presence of the object within the defined sensing region.

2. The proximity alert system of claim 1 , further comprising an enable switch operatively associated with said control system, said enable switch placing said proximity alert system in an enabled state.

3. The proximity alert system of claim 2 , further comprising a system status indicator operatively associated with said control system, said system status indicator providing a status indication of said proximity alert system.

4. The proximity alert system of claim 3 , wherein the status indication comprises one or more status indications consisting of an aural status indication and a visual status indication.

5. The proximity alert system of claim 1 , further comprising a vehicle interface system operatively associated with said control system, said vehicle interface system being operable to allow said control system to communicate with a vehicle data network operatively associated with the vehicle.

6. The proximity alert system of claim 5 , wherein the vehicle data network comprises a CAN network and wherein said vehicle interface system comprises a CAN interface system.

7. The proximity alert system of claim 1 , wherein the indication comprises one or more indications consisting of an aural indication and a visual indication.

8. The proximity alert system of claim 1 , wherein said annunciator system comprises a speaker.

9. The proximity alert system of claim 8 , wherein said annunciator system further comprises an audio processor system operatively connected to said speaker, said audio processor system being operable to cause said speaker to issue an aural indication when said sensor system detects the presence of the object within the defined sensing region.

10. The proximity alert system of claim 1 , wherein said sensor system comprises an ultrasonic sensor.

11. The proximity alert system of claim 1 , wherein said sensor system comprises a radar sensor.

12. A vehicle, comprising:

a mobility access device operatively associated with said vehicle, said mobility access device being moveable between a deployed position and a stowed position;

a proximity alert system operatively associated with said vehicle, said proximity alert system comprising:

a control system;

a sensor system operatively associated with said control system, said sensor system being operable to detect a presence of an object within a defined sensing region exterior to said vehicle, the defined sensing region encompassing a region defined by the mobility access device when the mobility access device is in the deployed position; and

an annunciator system operatively associated with said control system, said annunciator system being operable to provide an indication discernable to a person outside the vehicle and associated with the object that the object has been detected within the defined sensing region, said control system operating said sensor system when the mobility access device is in the stowed position, said control system operating said annunciator system when said sensor system detects the presence of the object within the defined sensing region.

13. The vehicle of claim 12 , wherein said mobility access device comprises a ramp mounted adjacent a door of said vehicle so that said ramp extends through an opening defined by said vehicle when the door is in an opened position and when said ramp is in the deployed position, said sensor system comprising a first sensor mounted to said mobility assist vehicle.

14. The mobility assist vehicle of claim 13 , wherein said sensor system further comprises a second sensor mounted to said mobility assist vehicle in spaced-apart relation to said first sensor.

15. A method of detecting a presence of an object within a defined sensing region adjacent a vehicle, the vehicle having a mobility access device that is moveable between a stowed position and a deployed position, said method comprising:

activating a sensor system operatively associated with the vehicle when the mobility access device is in the stowed position;

determining whether the sensor system has detected the presence of the object within the defined sensing region; and

operating an annunciator system when the sensor system has detected the presence of the object within the defined sensing region, the annunciator system providing an indication discernable to a person outside the vehicle and associated with the object that the object is present within the defined sensing region.

16. The method of claim 15 , further comprising deactivating the sensor system after performing said step of determining when the sensor system has not detected the presence of the object within the defined sensing region.

17. The method of claim 16 , further comprising repeating said activating, said determining, and said deactivating steps.

18. The method of claim 17 , further comprising allowing a first sleep time to elapse between said deactivating step and said activating step when the sensor system has not detected the presence of the object within the defined sensing region.

19. The method of claim 17 , further comprising allowing a second sleep time to elapse after said determining step when the sensor system has detected the presence of the object within the defined sensing region.

20. The method of claim 15 , further comprising confirming that the sensor system has detected the presence of the object within the defined sensing region before performing said operating step.

21. The method of claim 20 , wherein said confirming step comprises performing said activating and said determining steps.

22. The method of claim 21 , further comprising repeating said operating step for a predetermined number of times so long as the sensor system detects the presence of the object within the defined sensing region.

23. The method of claim 22 , further comprising resetting the predetermined number of times when the sensor system no longer detects the presence of the object in the defined sensing region so that said operating step can be performed again if the sensor system detects the presence of a second object within the defined sensing region.

24. The method of claim 15 , further comprising monitoring a vehicle state to determine when the vehicle is in a Stationary State and wherein said activating step is performed only when the monitored vehicle state is the Stationary State and when the mobility access device is in the stowed position.

25. The method of claim 24 , further comprising determining that the vehicle is in the Stationary State when a transmission selector of the vehicle is in a ‘park’ position.

26. A non-transitory computer-readable storage medium having computer-executable instructions embodied thereon that, when executed by at least one computer processor, cause the processor to:

activate a sensor system operatively associated with a vehicle when a mobility access device operatively associated with the vehicle is in a stowed position;

determine whether the sensor system has detected the presence of an object within a defined sensing region adjacent the vehicle; and

operate an annunciator system when the sensor system has detected the presence of the object within the defined sensing region, the annunciator system providing an indication discernable to a person outside the vehicle and associated with the object that the object is present within the defined sensing region.