Simplified method to inject ethanol or other solution additives into diesel engines equipped with a digital data bus
First Claim
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1. A secondary injection system for injecting an additive into the intake manifold of a compression ignition diesel engine of the type having a primary fuel system and a changeable rotation speed, the system comprising:
- an additive monitoring sensor; and
an electronic controller comprising;
a clock signal generator that generates a clocking signal having a rate that is independent of the rotation speed of the compression ignition diesel engine;
a microcomputer coupled to the clock signal generator and configured to monitor data providing rotation speed of the compression ignition diesel engine, receive a signal from the additive monitoring sensor and output a pulse width modulated fluid injector pulse train; and
a driving circuit connected to receive the pulse width modulated fluid injector pulse train, the driving circuit generating control signals configured to control 1 to n pulse width modulated electrical additive injectors that are not part of the primary fuel system, the additive injectors for injecting an additive into the intake manifold of the compression ignition diesel engine,wherein the microcomputer is configured to not synchronize the pulse width modulated fluid injector pulse train with position of the diesel engine but instead to command injection pulse instants which are unsynchronized to engine position and which occur at an injection rate which is referenced to the clocking signal rate, the microcomputer continually adjusting the commanded injection pulse instants in response to changes in rotation speed of the compression ignition diesel engine.
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Abstract
A system for the delivery of ethanol or other solution additives to the intake manifold of compression ignition diesel engines comprising an electronic control module containing a microcomputer capable of monitoring SAE J1939 serial data, receive a signal from an additive monitoring sensor and have outputs to turn on a pump relay, indicator lamp and from 1 to n pulse width modulated electrical fluid injectors.
47 Citations
20 Claims
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1. A secondary injection system for injecting an additive into the intake manifold of a compression ignition diesel engine of the type having a primary fuel system and a changeable rotation speed, the system comprising:
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an additive monitoring sensor; and an electronic controller comprising; a clock signal generator that generates a clocking signal having a rate that is independent of the rotation speed of the compression ignition diesel engine; a microcomputer coupled to the clock signal generator and configured to monitor data providing rotation speed of the compression ignition diesel engine, receive a signal from the additive monitoring sensor and output a pulse width modulated fluid injector pulse train; and a driving circuit connected to receive the pulse width modulated fluid injector pulse train, the driving circuit generating control signals configured to control 1 to n pulse width modulated electrical additive injectors that are not part of the primary fuel system, the additive injectors for injecting an additive into the intake manifold of the compression ignition diesel engine, wherein the microcomputer is configured to not synchronize the pulse width modulated fluid injector pulse train with position of the diesel engine but instead to command injection pulse instants which are unsynchronized to engine position and which occur at an injection rate which is referenced to the clocking signal rate, the microcomputer continually adjusting the commanded injection pulse instants in response to changes in rotation speed of the compression ignition diesel engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for injecting a fluid additive into the intake manifold of a compression ignition diesel engine of the type having a primary fuel delivery system and a changeable rotation speed, the method comprising:
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generating a clocking signal having a rate that is independent of the rotation speed of the compression ignition diesel engine; monitoring, with at least one processor, data providing rotation speed of the compression ignition diesel engine; receiving, with the at least one processor, a signal from an additive monitoring sensor; generating, with the at least one processor, a pulse width modulated fluid injector pulse train without synchronizing the pulse width modulated fluid injector pulse train with position of the diesel engine but instead by determining injection pulse instants which are unsynchronized to engine position and which occur at an injection rate which is referenced to the clocking signal rate; continually adjusting the determined injection pulse instants in response to changes in rotation speed of the compression ignition diesel engine; and in response to the modulated fluid injector pulse train, generating drive signals configured to control 1 to n pulse width modulated electrical additive injectors that are not part of the primary fuel system and which inject an additive into the intake manifold of the compression ignition diesel engine. - View Dependent Claims (13, 14, 15)
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16. A secondary injection retrofit kit for adding secondary additive fluid injection to a compression ignition diesel engine of the type having a primary fuel delivery system and a changeable rotation speed, the kit comprising:
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an additive monitoring sensor; at least one pulse width modulated additive fluid injector that is additional to the primary fuel system; and an electronic controller comprising; a clock signal generator that generates a clocking signal having a rate that is independent of rotation speed of the compression ignition diesel engine; a connector that connects to a data bus that carries rotation speed of the diesel engine; at least one processor coupled to the clock signal generator and connectable to the connector and the sensor, the processor configured to;
(a) monitor data on the data bus to obtain the rotation speed of the compression ignition diesel engine, (b) monitor a signal from the additive monitoring sensor, (c) generate pulse width modulated fluid injector pulses which are unsynchronized to engine position and which occur at an injection rate referenced to the clocking signal rate, and (d) continually adjust the timing of the injection pulses in response to changes in rotation speed of the compression ignition diesel engine; anda driving circuit connected to receive the pulse width modulated fluid injector pulses, the driving circuit generating injector drive signals to drive the at least one pulse width modulated electrical additive fluid injector. - View Dependent Claims (17, 18, 19, 20)
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Specification