Backup proximity sensor for a vehicle

Details Backup proximity sensor for a vehicle Backup proximity sensor for a vehicle

1998-02-05

2000-04-04

Pezzuto, Robert E.

Harvesters

Motorized harvester

With condition-responsive operation

180271, 340435, E21B 3464, B60Q 100

Patent

active

060446323

ABSTRACT:
A backup proximity sensor for a vehicle includes a first passive infrared sensor (PIR) and a second PIR vertically mounted with respect to one another on a pivotal support member. The first PIR and second PIR are angularly directed such that the respective fields of view converge, establishing a detection zone in a region behind a vehicle. A drive motor and scanning gear box are coupled to the pivotal support member and pivotally drive the first and second PIR in an oscillatory fashion about a predetermined arc. This establishes relative motion between the PIRs and a stationary warm body in the field of view of the two sensors, allowing the stationary body to be detected. A detection circuit receives output signals from the first PIR and second PIR and generates an output signal indicative of a warm body being detected by both the first and second PIRs. This eliminates false alarms generated by warm bodies outside the region of the desired detection zone.

REFERENCES:
patent: 4887415 (1989-12-01), Martin
patent: 5397890 (1995-03-01), Schueler et al.
patent: 5455557 (1995-10-01), Noll et al.
patent: 5574426 (1996-11-01), Shisgal et al.
Viggh, Herbert E.M. and Fynn, Anita M., "Infrared People Sensors for Mobile Robots," SPIE vol. 1007 Mobile Robots III (1998), pp. 391-398.

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