Nox elimination injector firing control circuit

A technology of ignition control and injectors, which is applied in the direction of mufflers, machines/engines, chemical instruments and methods, etc., can solve problems such as sensitive lift tolerances, and achieve the effect of improving the closing response
CN102762282BInactive Publication Date: 2014-12-24TENNECO AUTOMOTIVE OPERATING CO INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TENNECO AUTOMOTIVE OPERATING CO INC
Publication Date
2014-12-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

An NOx injection system for treating a vehicle exhaust system comprises an injector for injecting a select material into the vehicle exhaust system and including an electrical coil. An impedance element is connected in series with a flyback diode across the coil. An injector firing control circuit is electrically connected to the injector for driving the coil, the switching circuit operating in an on mode to fire the injector and in an off mode to turn off the injector. The impedance element increases reverse voltage to increase injector turn off response.
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Description

[0001] Cross References to Related Applications

[0002] There are no related applications. technical field

[0003] The present invention relates to systems and methods for eliminating nitrogen oxides in vehicle exhaust systems, and more particularly to injector firing control circuits that provide rapid opening and closing of injectors. Background technique

[0004] Vehicle exhaust aftertreatment systems are known to treat emissions from combustion processes such as compression engines. The system may include an exhaust treatment component that cleans or treats exhaust. One such known system is a urea injection system for eliminating or reducing NOx (nitrogen oxides) from the exhaust. The injection system injects urea into the exhaust. The injector includes an electric solenoid with a coil fired by the injector control circuit. The injectors are typically driven by a pulse width modulated control signal operable on the order of eg 5 Hz with relative on and off times co...

Claims

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