US 5,269,275 AGranted

Pulse width modulated controller for nitrous oxide and fuel delivery

AssigneesDavid Rook, David Dahlgren

InventorDavid Dahlgren

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Abstract

A pulse width modulated controller for N.sub.2 O and enrichment fuel delivery includes a system control logic section which processes signals from sensors for throttle position, engine speed and a number of other user-selectable parameters and a driver section controls electrically operated injectors or solenoid valves. The driver section allows the injectors to open only when all of the parameters sensed in the control section are met. Moreover, the driver section activates injectors according to a pulse generated by a pulse width modulation section which determines how long the injectors will remain activated. The pulse width modulation section receives signals based on the present throttle position and engine speed and adjusts these values according to values for N.sub.2 O and enrichment fuel based on engine speed and throttle position set by the user in a tuning section and thereby continuously provides the driver section with a pulse having a width proportional to the proper amount of N.sub.2 O and enrichment fuel which should be delivered at any given time. In addition, the tuning section is also user-settable to a maximum ignition timing adjustment and provides a signal proportional to ignition timing retard to an ignition control section for automatically adjusting ignition timing according to the amount of N.sub.2 O and enrichment fuel being delivered at any given moment.

Claims8

Dependent claims

A pulse width modulated controller for nitrous oxide and enrichment fuel delivery comprising

engine speed sensing means delivering a signal proportional to engine speed;
throttle position sensing means delivering a signal proportional to throttle position;
gate means coupled to said engine speed sensing means and said throttle position sensing means, said gate means generating a binary signal output when a threshold engine speed and throttle position are reached;
a first programmable memory means for storing a value corresponding to rate of nitrous oxide delivery;
a second programmable memory means for storing a value corresponding to rate of enrichment fuel delivery;
a first multiplier means coupled to said first memory means and said engine speed sensing means and said throttle position sensing means for generating a first multiplier output signal proportional to amount of nitrous oxide to be delivered;
a second multiplier means coupled to said second memory means and said engine speed sensing means and said throttle position sensing means for generating a second multiplier output signal proportional to amount of enrichment fuel to be delivered;
a clock means generating a pulse of predetermined frequency;
first comparator means coupled to said clock means and said first multiplier output signal generating a first pulse output having a pulse width proportional to amount of nitrous oxide to be delivered;
second comparator means coupled to said clock means and said second multiplier output signal generating a second pulse output having a pulse width proportional to amount of enrichment fuel to be delivered;
a nitrous oxide driver means driving a nitrous oxide injector, said nitrous oxide driver coupled to said first pulse output and said binary signal output;
and
an enrichment fuel driver means driving an enrichment fuel injector, said enrichment fuel driver coupled to said second pulse output and said binary signal output;
wherein said rate of nitrous oxide delivery and said rate of enrichment fuel delivery are continuously adjusted according to engine speed and throttle position by continuously varying said pulsewidth proportional to the amount of nitrous oxide and said pulsewidth proportional to the amount of enrichment fuel.

11 more elements

A pulse width modulated controller for nitrous oxide and enrichment fuel delivery comprising

first sensor means for determining present engine speed;
second sensor means for determining present throttle position;
first memory means for storing a threshold engine speed;
second memory means for storing a threshold throttle position;
first comparator means coupled to said first sensor means and said first memory means for comparing said present engine speed and said threshold engine speed, said first comparator means having a binary output;
second comparator means coupled to said second sensor means and said second memory means for comparing said present throttle position and said threshold throttle position, said second comparator means having a binary output;
`AND` gate means coupled to said first and second comparators, said gate means having a binary control output;
third memory means for storing a nitrous oxide delivery rate;
fourth memory means for storing an enrichment fuel delivery rate;
first multiplier means coupled to said first and second sensor means and said third memory means for generating a signal proportional to amount of nitrous oxide to be presently delivered;
second multiplier means coupled to said first and second sensor means and said fourth memory means for generating a signal proportional to amount of enrichment fuel to be presently delivered;
a nitrous oxide injector driver coupled to a nitrous oxide injector,
an enrichment fuel injector driver coupled to an enrichment fuel injector;
said drivers coupled to said binary control output and said first and second multiplier signals;
wherein said nitrous oxide delivery rate and said enrichment fuel delivery rate are continuously adjusted according to engine speed and throttle position by continuously varying a nitrous oxide injection pulsewidth proportional to the amount of nitrous oxide and a fuel enrichment injection pulsewidth proportional to the amount of enrichment fuel;
and
wherein said nitrous oxide and said enrichment fuel are continuously delivered according to said continuously adjusted rates when said threshold engine speed and said threshold throttle position have been reached.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/970,395Filed 2 Nov 1992
Granted: 14 Dec 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02P 5/045
Automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions: combined with electronic control…
F02B 43/10
Engines characterised by operating on gaseous fuels; Plants including such engines: engines or plants characterised by use of other specific…
F02M 69/044
Positioning of injectors with respect to engine, e.g. in the air intake conduit: for injecting into the intake conduit downstream of an air…
F02P 5/005
Advancing or retarding ignition; Control therefor: with combination of automatic and non- automatic means