Fuel supply in an ultrasonic atomizer is conducted according to a fuel increment ratio pattern in which the increment of fuel in fuel increment control for starting and warming up is 70% or less of that in a typical conventional pressure injection valve system, thereby improving startability, accelerability and fuel consumption rate and further enabling a reduction in exhaust emissions. When the engine is started in low-temperature conditions, the fuel is supplied by continuous injection to make uniform and reduce the mean diameter of droplets of atomized fuel, thereby improving the ignitability and startability. The fuel injection start timing is varied in accordance with the combustion chamber temperature at the time of starting the engine, i.e., when the engine is to be started in low-temperature conditions, no fuel is injected until a predetermined time has elapsed, and the fuel injection is started after the combustion chamber temperature has been raised by means of compression heat by driving the starter, thereby improving the cold startability even in the case of a fuel with a relatively high flash point. When the engine is in a transient operating condition, fuel injection from the ultrasonic atomizer is executed immediately before the velocity of an air stream in the vicinity of the ultrasonic atomizer rises, whereby the fuel that is atomized with a sufficient spread in the intake pipe can be carried in this state by the air stream to the combustion chamber where it is burned.

Fuel supply control method and ultrasonic atomizer

A plurality of fuel injection valves are all opened at the same time to supply fuel to all the cylinders of the engine, immediately upon closing of the starting switch. None of the fuel injection valves is opened until after the pistons of all the cylinders each have finished its one suction stroke after the above closing of the starting switch. Then, all the fuel injection valves are successively opened in predetermined sequence in synchronism with pulses of a TDC signal generated after the completion of the above suction strokes of the pistons of all the cylinders, to supply fuel to their respective cylinders, thereby obtaining smooth and positive starting of the engine.

Electronic fuel injection control system for multi-cylinder internal combustion engines

A fuel supply control method for a multicylinder internal combustion engine equipped with a fuel supply control system including a main fuel injection valve disposed in the intake passage upstream of the throttle valve, and an auxiliary fuel injection valve disposed in the intake passage downstream of the throttle valve and upstream of the intake manifold, for controlling the fuel supply control system according to operating conditions of the engine Fuel is supplied by the main fuel injection valve when the engine temperature is lower than a predetermined value, fuel is supplied by the auxiliary fuel injection valve when the engine temperature is higher than the predetermined value and the degree of opening of the throttle valve is smaller than a predetermined value, the fuel pressure applied to both the main fuel injection valve and the auxiliary fuel injection valve is regulated according to a predetermined parameter representing operating conditions of the engine, namely, pressure within the intake passage at a location downstream of the throttle valve, and the predetermined parameter is applied also to controlling the respective basic fuel injection periods of the main fuel injection valve and the auxiliary fuel injection valve

Fuel supply control method for internal combustion engines

An electrical control circuit, especially for a fuel supply device of an internal combustion engine, which serves to control a control member that reacts to the electrical current, said control taking place in dependence on the temperature. The electrical control circuit includes a temperature-dependent element in the form of a cold conducting (PTC resistor), and in the special exemplary embodiment is in the form of an electromagnetic valve as a control member especially to supply additional fuel into the intake manifold of an internal combustion engine at temperatures below a predetermined starting temperature of the internal combustion engine. A relay can also serve as the control member that controls the electrical current of the above-mentioned electromagnetic valve.

Electrical control circuit, especially for a fuel supply device of an internal combustion engine

Automatic starting fluid injection systems are useful, for example, to aid in the cold-starting of diesel engines In the subject invention, a microprocessor (18) under software control is used to controllably inject starting fluid into an engine passageway (42), such as an intake manifold During engine cranking, the microprocessor (18) delivers an injection signal to a fluid delivery system (38) to effect starting fluid injection into the engine passageway (42) When the engine starts, a subsequent injection time is calculated based on the sensed engine temperature The microprocessor (18) continues to deliver the injection signal to the fluid delivery system (38) during the subsequent injection time

Automatic starting fluid injection apparatus and method

An electrical fuel injection system for internal combustion engines, in which the operation of regular electromagnetic fuel injection valves is forcibly prevented so long as a starting electromagnetic fuel injection valve is in operation, whereby the engine can be started smoothly and positively without wetting the spark plug only with a readily atomizable fuel injected from the starting electromagnetic injection valve.

K Majima

Papers

Electrical fuel injection system for internal combustion engines