Claims:The invention claimed is:
1. A remote control system for use with a walk behind power tiller to facilitate left/right turning and halt remotely; the system comprising:
two numbers of 12V DC motor fixed with the handles of power tiller; the motors’ pulley connected with tip of the steering clutch levers by flexible metal string;
a relay module fixed on the handlebar of power tiller; the module receives the signal from the remote, and switches the respective motor ON/OFF;
a wireless remote having three active buttons; two buttons for right and left turn, and third for halting the power tiller;
a safety feature incorporated in the system; the feature includes a ultrasonic sensor and speaker; the ultrasonic sensor detects the distance of the obstruction/bund; the speaker produces aural signal at a pre-specified distance from the obstruction/bund; the feature also automatically halt, if the remote operator misses turning after the alarm sound.
2. The system of claim 1, wherein the said mechanism is very simple in installation and can be incorporated in any existing power tiller irrespective of their make, model and type.
3. The system of claim 1, wherein the said mechanism does not affect the manual operation of the power tiller and can be operated manually by walking behind or by remote control as and when required.
4. The system of claim 1, wherein the said mechanism eliminates walking behind the power tiller, thus reducing the operator’s drudgery. , Description:4.1 Prior art related to the development

4.1.1 Operation as walking behind the power tiller
The operation of a power tiller involves walking behind the machine on a tilled or puddled land continuously to steer it by actuating hand clutches provided on each handle (Fig.1). Hence, power tiller is also known as a walk behind tractor. The walking behind causes a lot of fatigue to the operator. The problem is aggravated while walking behind the machine during rota-puddling operation in rice fields (Tiwari and Gite, 2002). The operator of a power tiller is exposed to extreme environmental conditions like temperature, noise and vibrations. Among these factors, vibration causes a lot of stress on the operator which results in physiological/psychological fatigue after the daylong operation. Power tiller operator suffers from many disorders, pain and vascular disease as they are exposed to high level of hand transmitted vibration (Salokheh et al. 1995, Tiwari and Gite 2002 and Sam and Kathrivel 2006).

4.1.2 Operation as riding on power tiller
A riding type power tiller was designed and developed at the Central Institute of Agricultural Engineering, Bhopal on the basis of anthropometric data of Indian farm workers (Tiwari et. al., 1995) to overcome the problems associated in walking behind the machine (Fig. 2). The seating attachment mainly consists of a trough-type metallic shaft, a scooter wheel mounted on a vertical telescopic shaft for depth control. Nowadays, there are several manufacturers (VST Tillers Tractor Ltd, Greaves Cotton Ltd. etc) are selling the riding type power tiller with different design modifications. The riding types of power tiller lead to the following problems:
i. Difficulty in steering.
ii. Turning radius is more.
iii. Sitting posture is awkward.
iv. Leads to whole body vibration beyond an acceptable limit.
v. Power requirement is more which lead to higher fuel consumption.
vi. Shifting from one field to other is difficult.
vii. The mean heart rate during riding type power tiller operation varied from 85.1 to 90.2 beats/min which is considered as moderate work.

Fig.4.1.1: Walking behind power tiller Fig. 4.1.2: Sitting type power tiller

4.1.3 Patent by Mr.Prajwal Vijay Kumar
He received a patent on “Teleoperation or Wireless Remote Control System for a Tiller or Walking Tractor” via patent no: 244432. This patent enables remote controlled right-left turn and halt of a power tiller. His developed system eliminates the walking behind theoretically, but still lead to the following problems:
a) The system consists of a compact air compressor for powering pneumatics coupled to an engine. Thus, the attachment has to be made separately and consumes engine power.
b) The system is costly and complicated.
c) Stopping the power tiller remotely is complicated and needs separate arrangement.
d) There is no safety sensor to stop automatically.
e) There is no turning alarm in the system.

4.1.4 Patent filed by Mr Sanat Maddikeri
He has filled the patent on “Remote Control System for Farm Power Tiller” via application no.: 201841046991. His mechanism conists of two levers coupled with the directional control clutches of the power tiller on one end, and a push pad welded on the other end. The system was operated by a remote control from a distance. The major drawbacks of the system are:
i. This hampers the manual operation of power tiller.
ii. The levers were pivoted at a point towards the end where direction control levers were coupled which causes difficult manual contraction/ retardation of the levers.
iii. The push pad was welded to the frame of power tiller thereby it cannot be removed when needed or when the operator wants to use it for transport purpose.
iv. During manual operation, the linear actuators attached for directional maneuvering cannot be easily retracted without battery, thereby causing difficulty to operate during haulage operations.
v. There is no safety sensor to stop automatically.
vi. There is no turning alarm in the system.

4.1.5 Patent by Yoshiyuki Ito and Toru Aihara
They had received the U. S. patent on “Methods of Remote control of Tractors” via Patent No. 3695377 dated October 3, 1972. His system had eleven switches on the control panel of tractor, which can be controlled in the forward, reverse and stop modes, together with the ability to turn right and left with several degrees of sharpness while simultaneously controlling an implement such as a blade by circuits raising and lowering it, along with establishing a float condition. The major drawbacks of the system are:
i. This system was made specifically for tractor and earth mover machines and it won’t be feseable to install the same stsyem in the power tiller without any modification.
ii. The power source at the control unit is an A.C. power source. There is no A.C source of power in power tiller.

4.1.6 Patent by Thomas L. Altland et.al.
They had received the U. S. patent on “Remote Tiller controller” via patent no. 7128011 B2 dated October 31, 2006. His invention provides a steering control system that allows the captain of a boat to remotely control the boat’s steering system. The controller is attached on the tiller of the boat and controls the position of the boat by manipulating a switch on remote control transmitter. The drawbacks of the system are:
i. The system only controls the boat having the hull.
ii. The motors adapted in the drive unit is fixed to the tiller of the boat.
iii. The system is not feasible for controlling the power tiller.