A method and a circuit for determining the optimum gear, in terms of fuel consumption, of a motor vehicle drive is proposed, in which after upshifting, a driving power sufficient for accelerating the vehicle is to be made available regardless of such power parameters as total vehicle weight, roadway grades and the like and also regardless of the gear ratios of the gear steps. To this end, during driving, the gear ratios of the gear steps are ascertained by comparing the speeds (n, n.sub.1) befor...

An air-fuel ratio control system for an internal combustion engine including a carburetor having a main fuel system, a slow fuel system, a main bleed air passage leading to the main fuel system a main bleed air control passage leading to the main fuel system, a slow bleed air passage leading to the slow fuel system, and a slow bleed air control passage leading to the slow fuel system, and a valve for controlling the amount of bleed air supplied through the main and slow bleed air control passage...

Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake manifold and to a tube positioned downstream of the radiator fan. The air flow produced by the fan provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The positive pressure line is constantly open to the float chamber and is also connect...

An air-fuel ratio control apparatus of an internal combustion engine controls the change in the amount of fuel discharged into an intake passage downstream of a throttle valve of the engine more smoothly in accordance with the change in the amount of fuel discharged into the intake passage upstream of the throttle valve. Thus, the air-fuel ratio of the air-fuel mixture fed into the cylinder of the engine is changed smoothly without causing a surging phenomenon to occur in the engine.

An apparatus for indicating fuel efficiency in an aircraft. The apparatus includes a processor having a plurality of inputs, wherein the inputs include a ground speed input for receiving ground speed data signals and a fuel flow input for receiving fuel flow data signals. A display is connected to the processor. Generation means for determining a fuel efficiency number from ground speed data signals and fuel flow data signals is included and a display means is employed to generate a fuel efficie...

A fuel injection control system comprising an air-fuel ratio feedback control in combination with an electronically controlled fuel injection system. In this system, the concentration of oxygen contained in the engine exhaust gases is compared with a predetermined value in a comparator whereby whether the fuel injection quantity is to be corrected in a direction to increase it or in a direction to decrease it is determined in accordance with the output of the comparator, and the rate of change o...

In an apparatus and a method for indicating initial distance to empty (DTE) at completion of fueling, the initial DTE is calculated based on a fluctuating fuel consumption rate and is compensated by a compensation value so that DTE can be determined with more accuracy compared with an initial DTE calculated based on the fixed fuel consumption rate. The DTE to be confirmed can be thereby prevented from abruptly changing.

Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake manifold and to a tube positioned downstream of the radiator fan. The air flow produced by the fan provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The flow in the positive pressure line and in the negative pressure line is regulated ...

Two embodiments of air/fuel ratio adjusting systems for gaseous-fueled internal combustion engines. In each embodiment, a pressure regulator supplies regulated fuel in gaseous form from a source in which it is stored in a liquid form to a charge former that has a fuel control device such as a needle valve. The air/fuel ratio is maintained constant by mixing atmospheric air with the fuel before the charge former fuel control device under the control of an oxygen sensor in the exhaust system. In o...

An automated system tracks and records factors that affect fuel consumption. Configuration factors such as the actual engine(s) used in the airplane, weight, weight distribution, engine pressure, engine rotation speeds, etc.; environmental factors such as wind speed and direction, temperature, altitude and air pressure, etc.; and flight path factors such as actual route flown, distance flown, take-off/landing requirements for the airports, etc. are tracked and recorded. The resulting data is use...