Driverless tractor

Case IH utilize "follow me" technology and vehicle-to-vehicle communication with a driverless tractor that follows one operated by a person.

A driverless tractor is a form of autonomous technology. It is considered driverless because it operates without the presence of a human inside the tractor itself. Like other unmanned ground vehicles, they are programmed to independently observe their position, decide speed and avoid obstacles such as people, animals or objects in the field, while performing their task. The tractors, which emerged around 2011, use GPS and other technologies to farm land without the need of a driver, simply with the aid of a supervisor monitoring the progress at a control station. As of now, the two main manufacturers creating prototypes of the driverless tractor are John Deere and Autonomous Tractor Corporation.

History

The idea of a driverless tractor has been around since as early as 1940, when Frank W. Andrew invented his own. To guide his driverless tractor, a barrel or fixed wheel would be put in the center of the field and around it winds a cable attached to a steering arm on the front of the tractor. In the 1950s Ford developed a driverless tractor that they called "The Sniffer" but it was never produced because it couldn't be operated without running wire underground through the field. There were no major advances in driverless tractor technologies until 1994 when engineers at the Silsoh Research Institute developed the picture analysis system, which was used to guide a small driverless tractor designed for vegetable and root crops. This new tractor could even handle slight headland turns.

Current driverless tractor technologies build on recent developments in unmanned vehicles and agricultural technology. A tractor is defined as a powerful motor-driven vehicle with large, heavy treads, used for pulling farm machinery, other vehicles, etc. Most commonly, the term is used to describe a farm vehicle that provides the power and traction to mechanize agricultural tasks. Precision agriculture was a major shift in technology that occurred in the 1980s. The result was tractors that farmers drove with the aid of GPS devices and on-board computers. Precision agriculture focuses on maximizing returns while using minimum resources. With the aid of GPS devices and computers, farmers could use tractors more efficiently.

Next, engineers worked on semi-automated tractors. These tractors had drivers, but the drivers only had to steer at the end of each row. Subsequently, the idea of a driverless tractor emerged, and in 2011 and 2012 several companies created prototypes.

Driverless tractors were initially made to follow a main tractor (with a driver). This would have allowed one driver to do twice as much work using what is called "follow-me" technology. The driverless tractor would follow a lead tractor between fields just like a hired hand would. But now driverless tractor technologies have moved toward autonomy, or independent functioning.

Technology

The driverless tractor is part of a move to increase automation in farming. Other such autonomous technologies currently utilized in farming include automatic milking and automatic strawberry pickers. Developing such a technology is difficult. In order for it to be successful, the tractor must be able to follow deterministic tasks (a task that is defined before it starts, such as a path to follow on a field), have reactive behavior (the ability to react to an unknown situation such as an obstacle in the way), and have reflexive responses (making a decision without hesitation or time consuming calculations such as changing the steering angle if necessary). Ultimately, the tractor should imitate a human in its ability to observe spacial position and make decisions such as speed.

How the technology works

The technology for the driverless tractor has been evolving since its beginnings in the 1940s. There are now several different approaches to building and programming the tractors. Currently, the majority of fully autonomous tractors navigate using lasers that bounce signals off several mobile transponders located around the field. These lasers are accompanied with 150 MHz radios to deal with line-of-sight issues. Instead of drivers, the tractors have controllers. Controllers are people that supervise the tractors without being inside them. These controllers can supervise multiple tractors on multiple fields from one location. Currently, this supervision must be less than 25 miles away from the tractors. Tractors that function with supervised autonomy (automated technology, but with a supervising operator present) use vehicle-to-vehicle (V2V) technology and communication. There is a wireless connection between the two tractors to exchange and share data. The leading tractor (with an operator) determines speed and direction which is then transmitted to the driverless tractor to imitate.

Safety

The driverless tractor is considered controversial in terms of safety and public acceptance. A tractor operating without a driver makes some people nervous. Creating technology that stays safe in all scenarios where failure could possibly occur takes a lot of programming and time. In terms of motion detection, the tractors have sensors to stop them if they detect objects in their path such as people, animals, vehicles or other large objects. In the agriculture department at the University of Copenhagen Faculty of Life Sciences (now merged with the University of Copenhagen in Denmark, the safety of the driverless tractor was examined in detail. With their driverless tractor, they had one person designated as a safety operator. This operator controlled a switch which could immediately shut down and halt the tractor. They also wired four emergency stop switches on each corner of the tractor.

Current manufacturers

As it currently stands, there are no farm equipment manufacturers that are major distributors of driverless tractors in the agricultural market. However, there are two primary manufacturers that have been actively seeking to produce a marketable driverless tractor and have made strides toward substantial prototypes. These two manufacturers are John Deere and the Autonomous Tractor Corporation (ATC).

John Deere

John Deere, has had a strong influence on the development of automated farming technology. In early 2008, Deere and Company launched its ITEC Pro guidance product, an automated system based global positioning technology that is being developed in India. John Deere currently has a prototype in development. Rather than the use of lasers, the tractor uses two 6-inch dome antennas that receive signals from a global positioning satellite. Based on these satellite signals, the tractor follows a previously programmed route via an electronic map. These antenna are also for human operators to control the tractor if satellite signals have trouble penetrating buildings or heavy vegetation.

Autonomous Tractor Corporation

In January 2012, Terry Anderson established a company called Autonomous Tractor Corporation (ATC) located in North Dakota. The SPIRIT driverless tractor is a product of ATC. Anderson thought tractors were getting bigger and more expensive while not improving in quality. He thus came out of retirement to create the SPIRIT. The tractors Anderson helped create were initially made to follow a main tractor (that has a driver) but are now moving towards independent functioning.

Anderson, age 69 and a resident of Greenbush, Minnesota, tested half-scale models of his automated tractor design at his second home in Texas. Anderson presented his model at the Big Iron Farm Show in September 2012. Anderson stated that his goal is to build 25 units of his automated tractor in 2013 and sell them at a discount price for farmers to test.

The SPIRIT

The tractor is controlled by four failsafe controllers: two positioning and two safety. The safety controllers include a light detection and ranging (LIDAR) collision avoidance system and a perimeter ultra-sonic sensor. The positioning controllers area positioning system (APS) map and control the tractor’s path. A remote station can be set up from up to 25 miles away and control multiple tractors at a time.

Fendt

The German company, Fendt, has also been working on a driverless tractor. In 2011 in Hanover at the Agritechnica show, Fendt presented their driverless tractor model called the Guideconnect. The GuideConnect is a tractor programmed to mirror the movements of another tractor. An operator-driven tractor maneuvers through a field or through crops and is followed by a driverless tractor. Because the first tractor has a driver, he or she can manually steer to avoid obstacles with the driverless tractor following. Instead of focusing on a completely independent piece of technology, Fendt made GuideConnect to work together with operator-controlled machinery. GuideConnect is connected by satellite navigation and radio to the operator-driven tractor. The two perform as one unit. The one with the driver leads while the one without the driver follows.

Case IH

Case IH is a company created by the merging of J.I. Case Company and International Harvester. The company now operates under CNH Global, but the tractors are still branded Case IH. The driverless tractors produced by Case IH are referred to as "supervised autonomy." A tractor driven by a person is followed by autonomous machinery which copies the steering and speed of the former tractor. There is an initial driver, but the autonomous technology is present in the second tractor. The two machines operate with V2V technology, which is vehicle-to-vehicle communication. Director of marketing, Kevin Monk, said that supervised autonomy is the first step toward driverless tractors and autonomous agriculture technology. In 2011, Case IH won a gold medal SIMA Innovation Award for their work on automatic V2V synchronisation.

See also

• Google driverless car
• Agricultural machinery
• Precision agriculture