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Method of and apparatus for analyzing exhaust gases of motor vehicles

  • US 5,105,651 A
  • Filed: 07/17/1990
  • Issued: 04/21/1992
  • Est. Priority Date: 07/18/1989
  • Status: Expired due to Fees
First Claim
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1. A method of evaluating and analyzing exhaust gases issuing from the exhaust pipe of a motor vehicle wherein the exhaust gases pass through an adjustable three-way catalytic converter which is installed downstream of a lambda sensor, comprising the steps of memorizing for a period of at least 2 minutes, particularly for a period of 2-4 minutes, first signals which are transmitted by the sensor while the vehicle is in motion;

  • sampling the exhaust gases in the exhaust pipe downstream of the catalytic converter and generating second signals denoting the parameters of exhaust gases;

    storing reference signals denoting the desired parameters of exhaust gases; and

    comparing the stored reference signals with said first signals and said second signals.

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