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Method and system for dynamic testing of a vehicle exhaust system in a rigid frame test fixture

  • US 6,304,829 B1
  • Filed: 02/22/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Fees
First Claim
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1. A method for generating engine attachment control boundary conditions and corresponding actuator control signals for an exhaust system laboratory test fixture comprising:

  • collecting actual acceleration road load data for both a vehicle frame at each of the locations where the exhaust system attaches to the vehicle frame, and relative displacement or acceleration data for a vehicle powertrain relative to the vehicle frame;

    obtaining vehicle coordinates for test fixture accelerometer locations by identifying the vehicle coordinates that define the locations and directions on the vehicle frame at which the actual acceleration road load data was collected;

    performing a rigid body analysis by applying the actual acceleration road load data and the identified vehicle coordinates in a statistical multiple linear regression analysis to define a rigid body that fits the road load acceleration data at the vehicle coordinates;

    verifying the fit of the defined rigid body;

    determining boundary conditions on the test fixture by selecting a set of accelerometer locations and directions which best fit the defined rigid body; and

    determining the actuator control signals based on the determined boundary conditions in combination with a first control model arranged to control frame motion relative to a test floor.

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