This page contains a Flash digital edition of a book.
FIRST PRINCIPLES – DATABYTES


CHALLENGE 2


The traces display the damper displacement for a team’s two cars. The red car has produced good damper traces. However, although the green car’s traces show a similar trend, they are very noisy. What is causing this problem?


a) All four damper pots on the green car have failed. b) A fault within the green car’s loom means that the damper signals are not grounded. c) The sensors are loosely mounted on the green car.


CHALLENGE 3


The enclosed shows a bench test which is being performed on a data system connected to an ECU. Calibration of the CAN data stream from the ECU is being carried out, and when this screenshot was taken, the throttle butterfly potentiometer was being tested across its full range, 0-100%. The calibrated channel called “Throttle_ Butterfly” – where 1 count equals 1% of calibrated


52 www.racecar-engineering.com • January 2012


movement - does not appear to be correct. Given the screenshot, what is the most likely reason for this? a) The ECU is not turned on and no CAN data is being received b) The calibrated channel is referencing the incorrect byte in the CAN packet c) Throttle is not connected


Produced in association with Cosworth Tel: +44 (0)1954 253600 Email: ceenquiries@cosworth.com Website: www.cosworth.com/motorsport


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100