Mini Baja Car Data Acquisition System

Kendrick BurnettCody Notaro

Project Objectives Retrieve data on engine, clutch

temperature and input shaft of transmission and input data into excel so that the information can be analyzed and used to determine the optimal clutch setup.

Retrieve data from displacement sensors to determine the reactions of the shocks to different terrains and events. Data will then be used to determine the shock valving necessary.

Displacement Sensor Displacement sensors

will be mounted in line with the shocks so that they may measure the travel during a normal run of the car.

The Shock is the same on all four corners.

Thermal and Hall Effect The thermal sensor

will be mounted on the clutch cover so that we may monitor the temperature of the clutches.

The hall effect sensor will be mounted on the transmission cover so we may monitor the input shaft RPM.

Engine RPM The Engine RPM

sensor will wrap around the spark plug wire to monitor the RPM during a test run.

Sensor Location

Specifications 4 Displacement Sensors

0 – 6.5 inches front 0 – 7 inches rear +/- ¼ inch

1 Rotational Sensor 200 – 4200 RPM +/- 50 RPM

1 Engine RPM Sensor 1200 – 3600 RPM +/- 50 RPM

1 Temperature Sensor 10 – 80 C +/- 5 C

Analytical Component Rotational Sensor

200 – 4200 RPM 13.3 – 280 Hz w/ 4 Bolts

Analytical Component Engine RPM Circuit

1200 – 3600 RPM 20 – 60 Hz

Analytical Component Temperature Circuit

10 – 80 C (1k – 20k ohms) 1 – 4.167V ( 10 – 80 C) ~ .27 C/bit R1 = 4K Resistor Vout = Vcc*Rvar/(R1 +

Rvar)

Analytical Component Software

Algorithm Data will be saved

to a memory unit available for the HC12

Data will be transmitted to a pc program where the data will be interpreted and exported to an excel document

User Interface

Division Of Work Kendrick:

Testing Everything Else

Cody: Mounting Fabrication Testing

Work Completed Obtained Sensors Sensor Analysis Limited Testing of parts Circuit Design

Work To Be Completed HC12 Software PC Software Circuit Implementation Testing Installation on Baja car More Testing

Test Plan Test each Sensor for Accuracy

Temperature Sensor – Temperature Chamber

Input Shaft Rotational Sensor – Test Fixture

Engine RPM – On car testing Displacement Sensors – Test

Measurements

Power Consumption Power Consumption

~300 mW HC12 ~3 mW Temperature Sensor ~5 mW Displacement Sensor ~1 mW 555 timer

Total Power Consumption ~310 mW

System CostQty. Retail Total Actual

Displacement Sensors

4 $395 $1580 $355

Thermal Sensor 1 $15 $15 Donated

Hall Effect 1 $55 $55 Donated

Extra Memory 1 $60 $60 $60

HC12 1 $150 $150 Free

Misc. - $50 $50 $50

Total $1810 $465

Safety Concerns Baja Car driving could be

dangerous Nothing Connected to the data

acquisition should be dangerous

Questions ?