	US 7,484,405 B2
	System and method for engine sound calibration
Gary J. Hazelton, White Lake, Mich. (US); Fabien G. Redon, Southfield, Mich. (US); Boris D. Stojkovic, Ann Arbor, Mich. (US); Konstantin V. Tanin, Ann Arbor, Mich. (US); and Sherif H. Tahry, Troy, Mich. (US)
Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US)
Filed on Apr. 26, 2007, as Appl. No. 11/740,305.
Prior Publication US 2008/0264149 A1, Oct. 30, 2008
Int. Cl. G01M 15/00 (2006.01)

U.S. Cl. 73—114.07 [73/35.09]

12 Claims

1. A method for calibrating an engine, the engine having a cylinder for combustion of a fuel, the method comprising the following steps:

setting a set of combustion parameters for the engine;

detecting a combustion noise during combustion proximate to the cylinder;

detecting an engine sound radiated from the engine during combustion;

adjusting the combustion parameters and repeating the steps of detecting a combustion noise and detecting an engine sound;

generating a relationship between the detected combustion noises and the detected engine sounds;

determining a combustion noise level that correlates to a predefined engine sound threshold from the relationship;

adjusting a speed of the engine and a load on the engine and repeating the previous steps to determine a combustion noise level for each engine speed and engine load setting; and

calibrating the engine using the combustion noise levels.