Patent ID: 6978774

Claim:
Apparatus for control of exhaust emissions of a gas fueled internal combustion engine, said engine having an air intake, an intake conduit for gaseous fuel and an exhaust conduit for gaseous combustion products, which apparatus comprises: a control device comprising a housing having a fuel flow conduit therethrough, said fuel flow conduit being aligned with said intake conduit when said device is incorporated into said intake conduit with said conduits forming a continuous flow path for all fuel flowing to said engine and having disposed within said housing a programmable microprocessor; a gas flow metering valve; a pressure sensor having electrical signal communication with said microprocessor; and an actuator having electrical signal communication with said microprocessor and directly motivating said gas flow control valve; and a sensor disposed in said exhaust conduit for sensing of a gaseous component of said exhaust and having signal communication with said microprocessor; and an electrical power supply to said microprocessor, pressure transducer and actuator; whereby in response to a signal received from said sensor or from said pressure sensor indicative of engine operating conditions in which an unacceptable level of exhaust emissions exists, said microprocessor controls said actuator to incrementally motivate said gas flow metering valve to change outlet pressure and in turn flow rate of said fuel to said engine to create a air/fuel ratio in combustion chambers of said engine in a manner to restore emissions content level in said exhaust gas to an acceptable level of such exhaust emissions.