Internal-combustion engines – Charge forming device – Auxiliary air or oxygen added to combustible mixture
Patent
1980-12-11
1983-07-19
Lall, Parshotam S.
Internal-combustion engines
Charge forming device
Auxiliary air or oxygen added to combustible mixture
123585, F02M 2304
Patent
active
043938558
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a correcting device for the combustion of engines of vehicles by reducing or suppressing the fuel flow and/or by the admission of additional air downstream of the carburettor, the admission of exhaust gas, crank-case gas, or a mixture of these gases, during the transitional phases of operation of the engine: accelerations, decelerations, and changes in the transmission ratios of the vehicle.
Connected to special accessories, it may be used as an anti-pollution device and fuel economizer intended for vehicles in service, but the device is easily adaptable as an initial fitment on any new vehicle and it may also be used to improve the operation during transitional phases of modern carburettors, or electronic ignition systems.
Devices of this type, which are at present used to reduce the consumption rate and pollution capacity of engines, do not take account fully of the substantial corrections to be made with regard to fuel consumption rates during transitional phases of operation of engines when the momentary consumption rate becomes particularly high; these transitional phases of operation occur during about 60% of the running time of vehicles in city traffic, which allows the device to operate usefully for 75 to 80% of this running time.
Certain new devices which are more developed and largely electronic are capable of correcting engine combustion effectively both during steady running and transitional operation, but these devices have the disadvantage of being complex and fairly difficult to adapt to vehicles in service, for combustion corrections are made on the basis of several engine parameters interpreted pneumatically and mechanically or electromechanically and electronically; position of the carburettor, admission pressure, speed of rotation of the engine, temperatures, carbon monoxide rate detection probe placed in the engine exhaust circuit.
The combustion correction device, in accordance with this invention, makes it possible to avoid the anomolies and disadvantages of combustion correcting devices at present known, while being simple and rational in design, and sufficiently effective to reduce substantially the consumption rate and pollution capacity of the vehicle concerned, particularly in an urban environment.
The correcting actions do in fact take place throughout the whole range of operations of the engine, but only during the transitional phases of these operations, for which current carburettors have no correcting system which may be properly adapted to the case of vehicles operating in city or suburban traffic.
By its mode of action in transitional phases of operation, the device in accordance with this engine is rational and its action involves no change in the "chart of the specific consumption rates of the engine" at steady speeds, optimised by the manufacture of the vehicle.
It makes no correction of the air-fuel mixture during no-load idling or the steady speeds of the engine, for which carburettors, at the present stage of the technique, are capable of giving the engine a carburetted mixture close on the optimum proportion during the steady periods of operation of the vehicle when the gear-box ratios specified are used, and practically ignoring the pressure and temperature of the ambient air.
The device in accordance with the invention is mainly characterized by its system of control of the correcting component, which is actuated not in terms of the value of the engine admission pressure, but in terms of the amount of the variations this pressure undergoes during the coarse of time.
Reference is now made to the drawings wherein:
FIG. 1 is a schematic view of the basic device of this invention connected to an intake flange.
FIG. 2 is a schematic vertical sectional view taken through a carburetor embodying another form of the device in accordance with this invention.
FIG. 3 is a schematic vertical sectional view similar to FIG. 2 showing another form of control device.
FIG. 4 is another schematic vertical sectional view taken through a carburetor showing yet
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Fressard Jules
Mandar Andre
Mandar Martine
Greer, Jr. Thomas J.
Lall Parshotam S.
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