Method and device for controlling fuel injection

Claim 2

A fuel injection control method for a multi-cylinder sparkignition engine comprising the steps of a. applying the ignition signal applied to a predetermined cylinder to one input terminal of one of a plurality of flipflops which is equal in number to the cylinders of said engine and is interconnected to form a ring counter, b. applying the ignition signals of the other cylinders to corresponding first input terminals of the other flip-flops in said ring counter, c. applying the output signal of the preceding flip-flop to a second input terminal of each of said plurality of flip-flops, d. causing the succeeding flip-flop to provide the output for the fuel injection in response to the ignition signal for each cylinder, and e. applying to all cylinders the fuel injection signal which is delayed in time depending upon the engine speed with respect to said ignition signal, thereby injecting the fuel sequentially into the cylinders which correspond to the outputs of said succeeding flip-flops respectively.

Claim 3

A fuel injection control device for a multi-cylinder spark-ignition engine comprising a. a ring counter comprisinG a plurality of flip-flops equal in number to the cylinders; b. means for applying the ignition signal for a predetermined cylinder to a first input terminal of one of said plurality of flip-flops of said ring counter; c. means for applying the ignition signals for the other cylinders to corresponding first input terminals of the other flip-flops of said ring counter; d. means for causing the flip-flop next to the flip-flop which has received the ignition signal to provide a signal for fuel injection preparation in response to the generation of the ignition signal for each cylinder; e. means for delaying the application of fuel injection signals to the fuel injection devices of all of the cylinders for a predetermined time with respect to said ignition signal depending upon the engine speed; and f. means for injecting the fuel into the cylinder to which are applied both said fuel injection preparation signal and said fuel injection signal.

Claim 4

A fuel injection control device for a multi-cylinder spark-ignition engine comprising a. a ring counter comprisinG a plurality of flip-flops equal in number to the cylinders; b. means for applying the ignition signal for a predetermined cylinder to a first input terminal of one of said plurality of flip-flops of said ring counter; c. means for applying the ignition signals for the other cylinders to corresponding first input terminals of the other flip-flops of said ring counter; d. means for causing the flip-flop next to the flip-flop which has received the ignition signal to provide a signal for fuel injection preparation in response to the generation of the ignition signal for each cylinder; e. means for delaying the application of fuel injection signals to the fuel injection devices of all of the cylinders for a predetermined time with respect to said ignition signal depending upon the engine speed; and f. means for injecting the fuel into the cylinder to which are applied both said fuel injection preparation signal and said fuel injection signal.

Claim 5

A fuel injection control device as defined in claim 2 wherein said means for applying the ignition signal for a predetermined cylinder to a first input terminal of one of said plurality of flip-flops of said ring counter comprises a wave-shaping circuit whose input terminal is connected to a contact of said predetermined cylinder in a distributor and which forms a rectangular waveform signal; and wherein said means for applying the ignition signals to the first input terminal of the other flip-flops of said ring counter comprises a wave-shaping circuit whose input terminal is connected to the primary of an ignition coil and which forms a rectangular waveform signal.

Claim 6

A fuel injection control device as defined in claim 2 wherein said fuel injection signal generating means comprises a contact breaker which generates the pulse signals.

Claim 7

A fuel injection control device as defined in claim 2 wherein said fuel injection signal generating means comprises a photoelectric converter which generates the pulse signals.

Claim 8

A fuel injection control device as defined in claim 2 wherein said means for delaying the fuel injection signal comprises a. a plurality of differentiation circuits equal in number to the cylinders and having input terminals connected to the output terminals of said plurality of flip-flops respectively, b. an OR gate means having an input terminal connected to the output terminals of said plurality of differentiation circuits, c. a monostable multivibrator having a first input terminal is connected to the output terminal of said OR gate means and having a second input terminal connected through a frequency-voltage converter to a wave-shaping circuit which in turn is connected to the primary of said ignition coil and which is adapted to adjust the time delay of the output signal, d. a second differentiation circuit whose input terminal is connected to the output terminal of said monostable multivibrator, and e. a NOT circuit whose input terminal is connected to said second differentiation circuit and whose output terminal is connected to a fuel injection device for each cylinder.

Claim 9

A fuel injection control device as defined in claim 2 wherein said means for actuating said fuel injection device in response to both said fuel injection preparation signal and said fuel injection signal comprises an AND circuit.

Claim 10

A fuel injection control device as defined in claim 2, wherein a. said means for applying the fuel injection signal to the fuel injection devices of all of the cylinders comprises a contact braker which generates the pulse signal, and b. said means for actuating said fuel injection device in response to both said fuel injection preparation signal and said fuel injection signal comprises an AND circuit.

Claim 11

A fuel injection control device as defined in claim 2, wherein a. said means for applying the ignition signal for a predetermined cylinder to one input terminals of one of said plurality of flip-flops of said ring Counter comprises a wave-shaping circuit whose input terminal is connected to a contact of said predetermined cylinder in a distributor and which forms a rectangular wave form signal, b. said means for applying the ignition signals to a first input terminal of the other flip-flops of said ring counter comprises a wave-shaping circuit whose input terminal is connected to the primary of an ignition coil and which forms a rectangular waveform signal, c. said means for delaying the fuel injection signal comprises a monostable multivibrator having a first input terminal connected to the output terminal of said OR gate means and a second input terminal connected through a frequency-voltage converter to a wave-shaping circuit which in turn is connected to the primary of said ignition coil and which is adapted to adjust the time delay of the output signal, a differentiation circuit whose input terminal is connected to the output terminal of said monostable multivibrator, a NOT circuit whose input terminal is connected to said second mentioned differentiation circuit and whose output terminal is connected to a fuel injection device for each cylinder, and d. said means for actuating said fuel injection device in response to both said fuel injection preparation signal and said fuel injection signal comprises an AND circuit.

Claim 12

A fuel injection control device as defined in claim 2, wherein a. said means for applying the ignition signal for a predetermined cylinder to a first input terminal of one of said plurality of flip-flops of said ring counter comprises a wave-shaping circuit whose input terminal is connected to a contact of said predetermined cylinder in a distributor and which forms a rectangular waveform signal, b. said means for applying the ignition signals to corresponding first input terminals of the other flip-flops of said ring counter comprises a wave-shaping circuit whose input terminal is connected to the primary of an ignition coil and which forms a rectangular waveform signal, c. said means for delaying the fuel injection signal comprises a plurality of differentiation circuits equal in number to the cylinders having their input terminals connected to the output terminals of said plurality of flip-flops respectively, an OR gate means having its input terminal connected to the output terminals of said plurality of differentiation circuits, a monostable multivibrator having a first input terminal connected to the output terminal of said OR gate means and having a second input terminal connected through a frequency-voltage converter to a wave-shaping circuit which in turn is connected to the primary of said ignition coil and which is adapted to adjust the time delay of the output signal, a differentiation circuit whose input terminal is connected to the output terminal of said monostable multivibrator, a NOT circuit whose input terminal is connected to said second mentioned differentiation circuit and whose output terminal is connected to a fuel injection device for each cylinder, and d. said means for actuating said fuel injection device in response to both said fuel injection preparation signal and said fuel injection signal comprises an AND circuit.

Claim 13

A fuel injection control device as defined in claim 2, wherein said means for applying the fuel injection signal to the fuel injection devices of all the cylinders comprises a photoelectric converter for generating the pulse signal, and said means for actuating said fuel injection device in response to both said fuel injection preparation signal and said fuel injection signal comprises an AND circuit.