System for monitoring the efficiency of a catalyst, in particula

Details System for monitoring the efficiency of a catalyst, in particula System for monitoring the efficiency of a catalyst, in particula

1995-08-28

1997-05-06

Teska, Kevin J.

Boots, shoes, and leggings

36443104, 36443103, 364431061, 60274, 60276, 60277, 60285, 731181, G06G 770, F01N 300

Patent

active

056277571

ABSTRACT:
A system for measuring the efficiency of a motor vehicle catalytic converter through which gas flow passes. Two sensors monitor the gas conditions upstream and downstream of the catalytic converter and provide output signals to a microprocessor having dual input channels. The sensors may be lambda sensors. Each input channel leads to integration paths which receive the output from the sensors and calculate a variable average. The variable average is sent sequentially to a difference calculating node, a squaring node, and an integration module. The integration module sums intermediate signals over a period of time and generates output signals. The output signals are compared to each other and to reference values to determine if the catalytic converter is operating efficiently. A method of determining the efficiency of the catalytic converter using the aforementioned system is also provided.

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