NOx ELIMINATION INJECTOR FIRING CONTROL CIRCUIT
First Claim
Patent Images
1. Art NOx injection system for treating a vehicle exhaust system comprising:
- an injector for injecting a select material into the vehicle exhaust system and including an electrical coil; and
an injector firing control circuit electrically connected to the injector for driving the coil comprising a switch selectively coupling a supply to the electrical coil, a flyback diode connected across the electrical coil and an impedance element connected in series with the flyback diode to increase reverse voltage to increase injector turn off response.
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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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Citations
23 Claims
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1. Art NOx injection system for treating a vehicle exhaust system comprising:
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an injector for injecting a select material into the vehicle exhaust system and including an electrical coil; and an injector firing control circuit electrically connected to the injector for driving the coil comprising a switch selectively coupling a supply to the electrical coil, a flyback diode connected across the electrical coil and an impedance element connected in series with the flyback diode to increase reverse voltage to increase injector turn off response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An injector firing control circuit for a vehicle exhaust system injector for injecting a select material into a vehicle exhaust system for eliminating NOx, comprising:
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a voltage source generating a first select voltage level; a switch selectively coupling the voltage source to the injector; a flyback diode connected across the injector; and an impedance element connected in series with the flyback diode to increase reverse voltage to increase injector turn off response. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An NOx injection system for treating a vehicle exhaust system comprising:
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an injector for injecting a select material into the vehicle exhaust system and including an electrical coil; an impedance element connected in series with a flyback diode across the coil; and an injector firing control circuit 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 increasing reverse voltage to increase injector turn off response. - View Dependent Claims (22, 23)
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Specification