A description and function of catalytic converters

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A description and function of catalytic converters

A method of detecting the function of a catalytic converter in a vehicle, comprising: The method of claim 1 wherein the step of determining a first indication further comprises adjusting the acceleration to correspond to the slope.

The method of claim 1 wherein the step of determining a second indication comprises: The method of claim 1 wherein the step of determining a third indication comprises: A system for determining whether a moving vehicle has a properly functioning catalytic converter, comprising: A catalytic converter function detection system, comprising: The system of claim 11 wherein the means for determining a second indication comprises: The system of claim 11 wherein the means for determining a third indication comprises: The present invention relates generally to vehicle emissions sensing systems.

More particularly, the present invention relates to a method and system for determining, based on emissions data, whether a vehicle's catalytic converter is functioning in a proper manner.

In a closed path system, an emission sensor is directly connected to the exhaust of the vehicle, such as by insertion into a tailpipe. An open path vehicular emissions measurement system collects data by a means other than a direct connection to the tailpipe, such as a remote sensor that analyzes the individual components of emissions.

Open path vehicular emission systems are often preferable to closed path systems because they can be used in A description and function of catalytic converters locations and do not require the vehicle to stop for testing. However, a shortcoming of the current vehicular emission detection systems, and in particular open path vehicular emissions detection systems, is that they cannot distinguish vehicles having properly functioning catalytic converters from vehicles having failing or missing converters.

For example, an emission detection system will preferably measure the levels of emissions of one or more hydrocarbons from a vehicle. If the emissions include one or more hydrocarbons in concentrations that are above threshold levels, the current systems presume that the vehicle's catalytic converter is missing or not properly functioning.

Accordingly, the current systems will determine that the vehicle fails the emissions test. However, high emissions can be caused by operating conditions other than an improperly functioning catalytic converter.

An emissions test while this condition occurs will generally show higher carbon monoxide emission levels, which are construed to mean that the vehicle has excess emissions, leading to the false conclusion that the vehicle is violating emission standards.

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To try to overcome these shortcomings, prior systems have electronically measured the amount of heat emanating from the vehicle's engine while also measuring the amount of heat reflected from the road surface under the vehicle. This can be an expensive method, as remote heat measuring capabilities must be employed in a system that is rugged enough to handle continuous on-road exposure with sufficient resolution of measurement to distinguish temperatures.

Additionally, since vehicles have many different profiles of vehicles, such as from subcompact vehicles that are close to the road surface and large sport-utility vehicles that are relatively high off of the road surface, it is difficult to manufacture an open path temperature measuring device that would have a broad enough field of view to handle all types of vehicle profiles.

Also, background influences, such as the amount of sunlight, different types of road surfaces, and the presence of skid plates under vehicles, can contribute to inconsistent results from the prior heat energy measurement methods.

These shortcomings of the current vehicular emissions sensors contribute to increased errors of commission when they are used to identify vehicle with excess emissions.

An error of commission occurs when an open path emissions sensor identifies a vehicle as having excess emissions, only to discover in a confirmatory closed-path tailpipe emissions test that the vehicle is functioning within emissions laws.

In accordance with one embodiment of the present invention, A method of detecting the function of a catalytic converter in a vehicle includes the steps of: Optionally and preferably, the step of determining a first indication includes measuring a speed of the vehicle, measuring an acceleration of the vehicle, measuring a slope of the road, measuring a mass of the vehicle, measuring at least one ambient condition, calculating a specific power using the speed, the acceleration, the slope, the mass, and the at least one ambient condition and comparing the specific power to a predetermined limit.

The step of determining a first indication may also include adjusting the acceleration to correspond to the slope. Optionally, the step of determining a second indication includes using the emissions sensor to measure an amount of water vapor in the exhaust stream, using the emissions sensor to measure an amount of carbon dioxide in the exhaust stream, using the amount of water and the amount of carbon dioxide to determine a ratio of water and carbon dioxide, and comparing the ratio to a predetermined fuel factor.

The step of determining a second indication may also use the emissions sensor to measure an amount of 1,3-butadiene in the exhaust stream, and determining whether the amount exceeds a predetermined threshold. Optionally, the step of determining a third indication includes using the emissions sensor to measure an amount of ethylene in the exhaust stream, using the emissions sensor to measure an amount of acetylene in the exhaust stream, calculating a ratio of the amount of ethylene and the amount of acetylene, and comparing the ratio to a predetermined threshold.P Post catalytic converter fuel trim (FT), bank 2 -too rich: Catalytic converter: this guide can only provide a brief description of this process.

A description and function of catalytic converters

In simple terms, #1 oxygen sensors react to changes in the oxygen content of the exhaust stream that occur as a function of changes in the throttle opening that in turn, produces changes in.

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AMENDMENTS TO REGULATIONS REGARDING NEW AFTERMARKET AND USED CATALYTIC CONVERTERS OFFERED FOR SALE AND USE IN CALIFORNIA Sections Affected: Amendments to section , title 13, California Code of converters function at levels appropriate for the vehicle models they would be.

A description and function of catalytic converters

A Description of Catalytic Converters Essay - Introduction: General Description A catalytic converter is an exhaust component used in modern automobiles to decrease the emission of toxic gasses.

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