FORM - 2

THE PATENTS ACT, 1970

THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
CARBURETOR CHOKE CONTROL STATE INDICATION SYSTEM
MAHINDRA TWO WHEELERS LTD.
an Indian Company
of D-l block, Plot no. 18/2, Chinchwad,
Pune-411019,
Maharashtra, India.
Inventors:
1. TRIVEDI VIVEK
2. RAGUPATHI GOVINDARAJAN
3. CHANDRAN VINILKUMAR
4. RAVINDRAN NISHANTH PAUL
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE DISCLOSURE
The present disclosure relates to engines fitted with carburetors.
BACKGROUND
A carburetor is an important part of some gasoline driven Internal Combustion (IC) engines and aids in regulating air fuel ratio for proper functioning of the engine. Accelerators control and carburetors vary the air fuel ratios and quantity of charge based on load requirement. For good drivability and efficient running of an engine, the air fuel ratio needs to be varied according to engine temperature and load. In cold conditions, the air fuel ratio is made rich (more fuel to air) for proper engine starting. In conventional carburetors, a choke is provided to serve this purpose. The choke essentially restricts flow of air into the carburetor during engine start in cold conditions to make the mixture rich. Chokes are either manually or automatically controlled.
In manually operated chokes, the choke is manually operated during starting of the engine in cold condition by pulling a choke lever. When choke is operated, it restricts air flow to the venturi of the carburetor and enriches the air fuel ratio for easy cold starting of the engine. In automatic chokes of vehicle engines, the choke is operated and released based on parameters such as engine oil temperature and cylinder temperature. In manual choking systems, it is quite probable that the operator sometimes forgets to switch the choke OFF. In case of vehicles, continuing to run the vehicle with the choke in ON state results in wastage of fuel and poor drivability. Driving under such conditions also increases tail pipe emission.
With the choke in the ON state, the vehicle will continue to run with the rich mixture which results in unnecessary fuel consumption.

There is thus felt a need for a system that provides an indication that the choke has remained in an ON state although the conditions suitable for changing the choke to an OFF state has arrived.
OBJECTS
Some of the objects of the present disclosure aimed to ameliorate one or more problems of the prior art or to at least provide a useful alternative are described herein below:
An object of the disclosure is to provide a system for carburetor choke control state indication associated with electrical / electronic circuitry.
Another object of the disclosure is to provide a system for carburetor choke control state indication that is reliable.
Yet another object of the disclosure is to provide a system for carburetor choke control state indication that is cost effective.
Still another object of the disclosure is to provide a system associated with carburetor choke control state, which would enhance engine life.
One more object of the disclosure is to provide a system associated with carburetor choke control state, which will result in minimizing pollution during engine operation.
Still one more object of the disclosure is to provide a system associated with carburetor choke control state, which would result in less wastage of fuel consumption during engine operation.

Other objects and advantages of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.
SUMMARY
A system for indicating a carburetor choke control state to a rider of a vehicle is disclosed in accordance with an embodiment of the present disclosure. The system for indicating carburetor choke control state includes a sensing arrangement, a sensor, a control system and an indicator. The sensing arrangement detects an operational configuration of the carburetor choke control of the vehicle. The sensor detects engine oil temperature. The control system is functionally coupled to the sensing arrangement and said sensor. The indicator is functionally coupled to the control system and receives output signal from the control system and indicates the carburetor choke control state to the rider.
Typically, the control system receives feedback from the sensing arrangement and the sensor and delivers an output signal to the indicator enabling indication of carburetor choke control "ON" state when the carburetor choke control is in an operative configuration and the engine oil temperature is beyond a pre¬determined temperature value.
Typically, the system for indicating carburetor choke control state further includes a zenner diode and a resistor connected in series for facilitating stepping down voltage supply from a battery of the vehicle to voltage required for providing operating power to the control system.
The predetermined temperature value typically is 20 degree Celsius.
Generally, the control system includes an OR gate Integrated Circuit (IC) and an AND gate Integrated Circuit (IC), a choke control of a carburetor of the vehicle

acts as switch and the OR gate Integrated Circuit (IC) provides logic 'HIGH' as output that serves as a first input to the AND gate integrated Circuit (IC) when a circuit is completed by actuation of the choke control lever, said AND gate farther receives a second input from the sensor based on temperature of the engine oil detected by the second sensor and provides logic 'HIGH' as output when the choke control lever is in actuated state and engine oil temperature is beyond the pre-determined temperature value.
Alternatively, the control system includes an operational amplifier, a choke control of a carburetor of the vehicle acts as a switch and is connected to the operational amplifier, said sensor for measuring engine oil temperature is connected to the operational amplifier, the operational amplifier receives feedback from the choke control of a carburetor as well as from the sensor and the operational amplifier provides logic 'HIGH' as output when the choke control lever is in actuated state and engine oil temperature is beyond the pre¬determined temperature value.
Typically, the second sensor is a variable resistance temperature sensor.
Particularly, the indicator is a visual indicator.
Alternatively, the indicator is an auditory indicator.
In accordance with an embodiment, the system for indicating carburetor choke control state is coupled to a remote control system for facilitating remote release of the choke lever by the rider by means of a mechanical or motorized control for changing the choke control to an "OFF" state.
Generally, the system for indicating carburetor choke control state continuously indicates the choke control ON state to the rider, until the rider takes the necessary corrective action for changing the choke control to an OFF state.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The objects and features of the present invention will be more clearly understood from the following description of the invention taken in conjunction with the accompanying drawings, in which
FIGURE 1 illustrates a schematic block diagram of a system for carburetor choke control state indication in accordance with a first embodiment;
FIGURE 2 illustrates a schematic block diagram of a system for carburetor choke control state indication in accordance with a second embodiment; and
FIGURE 3 illustrates a flow diagram indicating the key steps involved in the system for carburetor choke control state indication.
DETAILED DISCRIPTION OF ACCOMPANYING DRAWINGS
The system for carburetor choke control state indication of the present disclosure will now be described with reference to the embodiments which do not limit the scope and ambit of the disclosure:
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. The description provided is purely by way of example and illustration. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

The system of the present disclosure provides carburetor choke control state indication, thus warning a rider if the choke control remains inadvertently ON although the conditions suitable for changing the choke to an OFF state has arrived. It senses signals from the carburetor choke control and the engine oil temperature and gives a visual warning signal to turn OFF the choke control. The system makes use of electronic/electrical circuit mounted on the vehicle which receives input from the carburetor choke control and the circulating engine oil and based on the input, if both the conditions are true, an output is generated and an indicating system provides a warning indication to the rider regarding the choke control being in an ON state. In accordance with another aspect of the present disclosure, the indication is at least one of visual or auditory type or both.
The working of the carburetor choke control state indication system is illustrated in FIGURE 3 which depicts a flow diagram indicating the key steps involved in the system of the present disclosure. FIGURES 1 and 2 illustrate a schematic block diagram of a system for carburetor choke control state indication in accordance with a first and second embodiment respectively.
A 12V IT battery provide power to the system 100 of FIGURE 1 and FIGURE 2 which is based on at least one Integrated Circuit (IC). The battery is merely a source of power. Any other alternative arrangement that powers the system 100 is also included within the scope of the present disclosure. The carburetor choke control 10 acts as a switch. The operating voltage for the IC is preferably 5V. A zener diode 14 and a resistor 12 are connected in series to step down the input voltage to the IC. The zener diode 14 also ensures that the operating voltage of the IC is maintained at a pre-determined value, even if the battery voltage drops below rated voltage but up to the operating voltage of the IC.

In accordance with a first embodiment as illustrated in FIGURE 1, two inputs in form of current/voltage are provided to an OR gate 16 from the battery of the vehicle, one input being the negative terminal and other being the input from the choke control 10. This arrangement acts as sensing arrangement that detects and signals an operational configuration of the carburetor choke control of the vehicle. When the choke control 10 is turned ON by operating a choke control lever, the circuit is completed and the output is binary signal '1' or logic 'HIGH' which serves as an input to an AND gate 18 . The OR gate 16 and the AND gate 18 together forms a control system. A temperature sensor 22 senses temperature of engine oil 24 and provides a second input to the AND gate 18. The output of the AND gate 18 will be binary signal Tor logic 'HIGH' when choke control 10 in an ON state and the temperature of engine oil 24 increases beyond a pre-determined level, thereby acting as a sensor for detecting if engine oil temperature is beyond a pre-determined temperature value and thus causing an indicating system 26 to glow and warn the rider that choke control 10 is in an ON state beyond requirement.
In accordance with a second embodiment as illustrated in FIGURE 2, an operational amplifier 20 is provided instead of a combination of OR gate 16 and AND gate 18 of FIGURE 1. In this embodiment also, the choke control 10 serves as a switch and is connected to the operational amplifier 20. Output from the temperature sensor 22 is provided as another input to an operational amplifier 20 and the output of the operational amplifier 20 is connected to the indicating system 26. When the choke control 10 is in an ON state and the temperature of the engine oil 24 increases beyond a pre-determined level, the output of operational amplifier 20 will be binary signal Tor logic 'HIGH'LED causing the indicating system 26 to glow and warn the rider that the choke control 10 is in an ON state beyond requirement.

In accordance with an aspect of the present disclosure, the temperature sensor 22 is a thermistor and works on the principle of a variable resistor whose resistance varies according to temperature. In accordance with another aspect of the present disclosure, a feature is included into the system wherein once a choke control state is being ON, a warning is generated, a control is executed remotely by the rider to turn the choke control OFF through a mechanical / motorized arrangement that releases the choke control lever.
Although the above description of the system of the present disclosure is made with reference to a vehicle engine, the aforementioned system may be applied in general to any engine having a carburetor choke control thereof.
TECHNICAL ADVANCEMENTS AND ECONOMIC SIGNIFICANCE
The technical advancements offered by the present disclosure include the realization of:
• a system for carburetor choke control state indication associated with electrical / electronic circuitry;
• a system for carburetor choke control state indication that is reliable;
• a system for carburetor choke control state indication that is cost effective;
• a system associated with carburetor choke control state, which would enhance engine life;
• a system associated with carburetor choke control state, which would result in minimizing pollution during engine operation; and

• a system associated with carburetor choke control state, which would result in less wastage of fuel consumption during engine operation.
The use of the expression "at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

We Claim:
1. A system for indicating a carburetor choke control state to a rider of a
vehicle, said system comprising:
• a sensing arrangement adapted to detect and signal an operational
configuration of the carburetor choke control of the vehicle;
• a sensor for detecting engine oil temperature;
• a control system functionally coupled to said sensing arrangement
and said sensor; and
• an indicator functionally coupled to said control system and
adapted to receive said output signal from said control system and
indicate carburetor choke control state to the rider.
2. The system for indicating carburetor choke control state as claimed in claim 1, wherein the control system is adapted to receive feedback from the sensing arrangement and the sensor and deliver an output signal to the indicator enabling indication of carburetor choke control "ON" state when the carburetor choke control is in an operative configuration and the engine oil temperature is beyond a pre-determined temperature value.
3. The system for indicating carburetor choke control state as claimed in claim 1, further comprising a zenner diode and a resistor connected in series for facilitating stepping down voltage supply from a battery of the vehicle to voltage required for providing operating power to said control system.
4. The system for indicating carburetor choke control state as claimed in claim 1, wherein said predetermined temperature value is 20 degree Celsius.
5. The system for indicating carburetor choke control state as claimed in claim 1, wherein said control system comprises an OR gate Integrated

Circuit (IC) and an AND gate Integrated Circuit (IC), a choke control of a carburetor of the vehicle acts as switch and said OR gate integrated Circuit (IC) provides logic 'HIGH' as output that serves as a first input to said AND gate integrated Circuit (IC) when a circuit is completed by actuation of said choke control lever, said AND gate further receives a second input from said sensor based on temperature of said engine oil detected by said second sensor and provides logic 'HIGH' as output when said choke control lever is in actuated state and engine oil temperature is beyond said pre-determined temperature value.
6. The system for indicating carburetor choke control state as claimed in claim 1, wherein said control system comprises an operational amplifier, a choke control of a carburetor of the vehicle acts as a switch and is connected to said operational amplifier, said sensor is adapted to measure engine oil temperature and is connected to the operational amplifier, said operational amplifier receives feedback from the choke control of a carburetor as well as from said sensor and provides logic 'HIGH' as output when said choke control lever is in actuated state and engine oil temperature is beyond said pre-determined temperature value.
7. The system for indicating carburetor choke control state as claimed in claim 1, wherein said second sensor is a variable resistance temperature sensor.
8. The system for indicating carburetor choke control state as claimed in claim 1, wherein said indicator is a visual indicator.
9. The system for indicating carburetor choke control state as claimed in claim 1, wherein said indicator is an auditory indicator.
10. The system for indicating carburetor choke state as claimed in claim 1, is coupled to a remote control system for facilitating remote release of the choke lever by the rider by means of a mechanical or motorized control for changing said choke control to an "OFF" state.

11.The system for indicating carburetor choke state as claimed in claim 1, adapted to continuously indicate said choke control ON state to the rider, until said rider takes the necessary corrective action for changing the choke control to an OFF state.