Claims:We Claim:
1. An arrangement (10) for calibrating an engine (12) of a vehicle (11), said arrangement (10) comprising:
- multiple sensing elements (14) each comprising a corresponding transmitter (16) and an antenna (18), positioned at different components of an engine (12) of said vehicle (11);
- a receiver module (20) having multiple signal receptors (22) adapted to receive signal from said multiple sensing elements (14) and a CAN signal converter (22) adapted to convert said received sensor signals to CAN signals,
said receiver module (20) connected to an acquisition module (24) adapted to analyze said converted sensor signals during calibration of said engine (12) of said vehicle (11).

2. The arrangement (10) as claimed in claim 1, wherein at least one said sensing element (14) is connected to said transmitter (16), by plugging a male connector of said sensing element (14) into a female connector present in said transmitter (16).

3. The arrangement (10) as claimed in claim 1, wherein a rechargeable battery (26) is connected to each of said transmitter (16) in each of said sensing element (14).

4. The arrangement (10) as claimed in claim 1, wherein at least one said sensing element (14) comprises a first controller (28) adapted to transmit a sensed value via said antenna (18) upon receiving a request from said receiver module (20).

5. The arrangement (10) as claimed in claim 1, wherein said receiver module (20) comprises a second controller adapted to transmit a signal to said transmitter (16) for every predefined time interval.

6. The arrangement (10) as claimed in claim 1, wherein said multiple sensing elements (14) are temperature sensors adapted to sense temperature at multiple components of said engine (12) of said vehicle (11) during said calibration of said engine (12) of said vehicle (11).

7. The arrangement (10) as claimed in claim 1, wherein said multiple sensing elements (14) are pressure sensors adapted to sense pressure at multiple components of said engine (12) of said vehicle (11) during said calibration of said engine (12) of said vehicle (11).

, Description:Field of the invention
[0001] This invention relates to an arrangement for calibrating an engine of a vehicle.

Background of the invention
[0002] During Engine and vehicle calibration activity, engine and vehicle are instrumented with temperature sensors to capture the temperature data at each point. These sensors further will be connected to an acquisition module through intermediate cables for further analysis of the calibration. In case of vehicle instrumentation acquisition modules are kept inside the vehicle and each intermediate cables needs to routed towards inside from different positions, like from engine compartment, from exhaust lines etc. It will be very difficult to draw these intermediate cables from different positions to inside the vehicle, as there won’t be enough space available to do routing of cables. Even the intermediate cables routed there will be chances of loose connections or cable breakages, which causes loss of data.

[0003] Prior art patent US4383441 discloses a method for generating a table of engine calibration control values for an adaptive spark and EGR control strategy. The adaptive strategy adjusts spark timing and magnitude of EGR as a function of engine energy usage per distance traveled while maintaining feedgas emissions at a constant level over a wide variety of driving patterns including urban, suburban and highway.

Brief description of the accompanying drawing
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:
[0005] FIG. 1 illustrates an arrangement for calibrating a vehicle in accordance with one embodiment of the invention.

Detailed description of the embodiments
[0006] FIG. 1 illustrates an arrangement 10 for calibrating an engine 12 of a vehicle 11 according to one embodiment of the invention. The arrangement 10 comprises multiple sensing elements 14 each comprising a corresponding transmitter 16 and an antenna 18, positioned at different components of the engine 12 of the vehicle 11. The arrangement 10 comprises a receiver module 20 having multiple signal receptors 22 adapted to receive signal from the multiple sensing elements 14 and a CAN signal converter 23 adapted to convert the received sensor signals to CAN signals. The receiver module 20 is connected to an acquisition module 24. The acquisition module 24 adapted to analyze the converted sensor signals during calibration of the engine 12 of the vehicle 11.

[0007] Further the construction of the arrangement 10 and the components of the arrangement 10 and is explained as follows. Each transmitter 16 is connected to corresponding sensing element 14 in such a way that, the male connector of the sensing element 14 is plugged into the female connector present in the transmitter 16. Each transmitter 16 is connected to a corresponding rechargeable battery 26 to power the sensing element 14 and the transmitter 16. Each sensing element 14 comprises a first controller 28 adapted to receive a signal from the receiver module 20 for sensing at least one engine 12 parameter for every predefined time interval. The receiver module 20 comprises a second controller 30 adapted to transmit a signal to the first controller 28 of the sensing element 14, to sense at least one engine parameter. At least one engine parameter is chosen from a group of engine parameters comprising temperature, pressure or the like.

[0008] According to one embodiment of the invention, the multiple sensing elements 14 are temperature sensors adapted to sense temperature at multiple components of the engine 12 of the vehicle 11 during the calibration of the engine 12 of the vehicle 11. According to another embodiment of the invention, the multiple sensing elements 14 are pressure sensors adapted to sense pressure at multiple components of the engine of the vehicle during the calibration of the vehicle. The transmitter 16 and the receiver modules 20 transmits the sensed values and the signals to each other wirelessly using at least one communication means known to a person skilled in the art.

[0009] The method of working of the arrangement for calibrating the engine 12 of the vehicle 11 is explained below. Multiple sensing elements 14 having the corresponding transmitter 16 is positioned at different places of the engine 12, where the temperature/pressure are to be monitored. The antenna 18 present in the transmitter 16, transmits and receives the signals from the receiver module 20. The receiver module 20 is placed at the driver’s position in the vehicle 11. The second controller 30 present in the receiver module 20 transmits a signal to the first controller 28 present in the sensing element 14, to sense at least one engine parameter (like a temperature, a pressure) and transmit the sensed value via the transmitter 16. The receiver module 20 upon receiving the sensed values, converts into CAN signals by the CAN converter 23.

[0010] The converted CAN signals are transmitted to an acquisition module 24 for further analysis of the working conditions of the engine 12 of the vehicle 11. The acquisition module 24 is connected to the receiver module 20 at the driver’s end. For instance, during the calibration of the engine 12 of the vehicle 11, at least fifteen temperature sensing elements 14 are placed at various components of the engine 12 to determine the fluctuations in the temperature during the operation of the engine 12. The sensed temperature values are transmitted to the receiver module 20 via the transmitter 16 for every predefined time interval. The receiver module 20 comprising multiple signal receptors 22 receives fifteen sensed temperature values individually, and with the help of the CAN converter 23 converts the sensed temperature values into CAN signals. The converted CAN signals are transmitted to the acquisition module 24 for further analysis.

[0011] With the above disclosed arrangement, the usage of cables connecting the sensing elements 14 and the acquisition module 24 is avoided. The above arrangement provides a robust and a low powered solution. Breakage of the cables and loose connections while connecting the transmitter 16 and the receiver modules 20 can be avoided.

[0012] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.