US Patent 9956911 Object detection for vehicles

The present disclosure provides for a vehicle warning system. The warning system includes a sensor configured to detect a presence of a foreign object and a controller in communication with the sensor. The controller is operable to periodically communicate with the sensor to identify the presence of the foreign object while the vehicle is parked. The controller is further operable to output a warning signal in response to the presence of the foreign object. The warning signal is configured to communicate a detection of the foreign object having entered a path of the vehicle during a period while the vehicle is parked.